With the integration of hyperspectral sensors and drones, drone hyperspectral remote sens ing technology has become one of the most important research directions in the field of remote sensing. Compared to traditional satellite remote sensing technology, drone remote sensing technology offers ad vantages such as low cost, simplicity of operation, high spatial resolution, and high temporal resolu tion. Researchers can flexibly acquire hyperspectral images of study areas. Hyperspectral sensors pro vide more spectral details, and the combination of drone technology and hyperspectral technology of fers researchers an effective technical means for remote sensing related research. In recent years, it has received widespread attention. This article summarizes the characteristics and development status of drones, sensors, and hyperspectral technology. It also describes the preparation work before the flight of drone hyperspectral remote sensing technology and the processing of the collected data. This article focuses on the application of drone hyperspectral remote sensing technology in fields such as hydrology, agriculture and forestry, natural disasters, and marine environments. It also introduces the main types and basic parameters of sensors carried by drones. Additionally, it points out the current challenges, opportunities, and development prospects of using drone hyperspectral technology.

The spaceborne microwave scatterometer, characterized by its high spatiotemporal resolution and all-weather observational capability, serves as a pivotal tool for observing the sea surface wind fields with multiple bands, polarizations, and viewing angles. It has emerged as a crucial means to acquire high-resolution sea surface wind field data over expansive regions, playing a central role as the primary satellite sensor for global sea surface wind field observations. Consequently, investigating its intricacies holds significant academic significance. This paper offers a comprehensive and systematic examination of the advancements made by scholars globally in the domain of sea surface wind field inversion methods. Emphasizing the evolution of geophysical model functions, the optimization of fuzzy solution removal schemes, and the application of neural network algorithms and deep learning in ocean remote sensing, it provides a nuanced exploration of this interdisciplinary field. By delving into these topics, this paper not only furnishes valuable insights for advancing sea surface wind field retrieval technology but also presents novel perspectives for future research and applications within the realm of ocean remote sensing.

Real time population data is crucial for urban planning, resource management, and the sustainable development of society. In order to effectively enhance existing population estimation methods based on geospatial big data, this study comprehensively compares and analyzes the population simulation performance of different open geospatial datasets, and develops a comprehensive approach integrating remote sensing and emerging social media user data to achieve high precision rapid estimation of population at the county level. Taking Chinese counties as the experimental area, multiple linear regression and geographically weighted regression methods are employed to comprehensively evaluate the population modeling capability of various geospatial remote sensing data. The data utilized include Tencent Location Based Service ( LBS) data, Amap Point of Interest ( POI) data, nighttime light remote sensing data, and land use / cover data derived from remote sensing. The research findings indicate that, in estimating population distribution, Tencent location data and POI data outperform remotely sensed land use / cover data and nighttime light satellite data, with population simulation accuracies of 81 .6% , 70 .8% , 68 .8% , and 63 .0% , respectively. Furthermore, the comprehensive use of multisource geospatial data can achieve an overall population simulation accura cy of 85 .4% . The research results and discoveries can provide data and technical support for popula tion related policies in China.

Net primary productivity ( NPP) of vegetation is an important component of the surface carbon cycle, and the accurate assessment of NPP is of great significance to the correct understanding of ecosystem energy transformation and the evaluation of ecosystem health. While existing studies have reviewed NPP assessment from perspectives such as light use efficiency, ecosystem process simulation, and remote sensing data-driven approaches, there remains a need for further refinement in reviewing specific drug molecules, and the relationship trend between different descriptors and the three performance indicators were preliminarily explored. Secondly, six machine learning models including Random Forest, Extreme Gradient Boosting ( XGB) , Gradient Boosting Decision Tree, Light Gradient Boosting Machine, Backpropagation Neural Network, and Support Vector Regression six machine learning algorithms with eight descriptors and three performance evaluation criteria ( Adsorption selectivity SS-IBU/ N2 ,Adsorption capacity NS-IBU/ N2 and Tradeoff value TSN) for big data training and mining, were used to establish quantitative relationships. The results show that the prediction accuracy of the six ML algorithms is N > TSN > S . For S , XGB showed the best prediction ( R2 = 0.83) . Subsequently, based on the XGB model, the SHaple Additive explanation ( SHAP) method was used to explain and analyze the importance of MOF descriptors to performance indicators. The total energy generated during MOF adsorption is considered to be the key influencing factor, and it shows a positive correlation trend with both TSN and NS-IBU . Finally, combined with toxicological analysis, a series of high-performance MOF materials were recommended and designed. This work, from molecular level, high-throughput computing to big data mining, systematically studied the adsorption and delivery mechanism of ibuprofen drug molecules in MOF, which provides theoretical guidance for drug delivery materials. calculation methods. In this study, typical NPP assessment models are systematically reviewed according to the classification of climate productivity model, physiological and ecological process model, and light energy use model. Focusing on the structure and driving parameters of each model, this paper discusses and analyzes the characteristics and applicability of each model, and makes an overview of the key issues of the models-development, pointing out that future research needs to integrate the perspectives of multiple disciplines, give full play to the advantages of the new earth observation technology, and further deepen the scale conversion related to NPP assessment.

The coordinated development of urban agglomerations is an essential requirement for achieving high-quality regional economic growth. Examining the network characteristics of Chinese urban agglomerations from a multi-dimensional perspective holds significant importance in advancing the co ordinated development of these agglomerations. This article establishes urban agglomeration information, transportation, and population networks based on data from information search indices, train schedules, and Baidu migration indices. By employing social network analysis methods, the spatial network connectivity characteristics of 19 urban agglomerations in China are examined. The research findings are as follows: ①Scale Characteristics: The ranking of network sizes among the 19 urban ag glomerations does not vary significantly across different factor flows. Higher levels of economic development correspond to larger network sizes of urban agglomerations. ②Element Connections: Urban agglomerations exhibit hierarchical and differential characteristics in their information, transportation, and population networks. The information network is primarily characterized by strong connections, while the transportation and population networks are mainly characterized by moderate to weak connections. Spatially, the information network displays a “ diamond” shaped pattern, while the transportation and population networks exhibit a “ two horizontal and three vertical” pattern. ③Cluster Characteristics: Information connections between urban agglomerations are the closest, followed by transportation and population connections. The impact of geographical proximity on different element networks varies, with the overall pattern showing a higher impact on the population network followed by the transportation network and then the information network. ④Urban Agglomeration Types: Utilizing net work indicators, the identified types of urban agglomerations are classified into four categories: radiative, siphon, balanced, and peripheral. These types demonstrate heterogeneous characteristics across different element networks. In the information network, the urban agglomerations in the eastern, central, and western regions exhibit distinct network characteristics, with a trend of “ radiation type dominance by eastern urban agglomerations and siphon type dominance by western cities” .

Based on the thermodynamic method, NRTLRK, Aspen plus software was used to simulate isopropyl alcohol production process by transesterification and optimized design of energy saving, which is catalyzed by sodium methanol solid catalyst. The project used 50 000 tons isopropyl alcohol production per year, while the factors of reaction equilibrium, separation difficulty and cost of raw materials are considered for reactor design. The reactive distillation column is set as isopropyl alcohol synthesis reactor. The bottoms flow is 99.99 wt% of isopropyl alcohol. The pressure swing distillation system design is based on the thermal characteristics of flow from the top of the reactive distillation column, which can achieve the goals of recycle the byproducts, methyl acetate, and the raw material, methanol. Heat pump distillation and double effect distillation technologies are adopted in reactive distillation and pressure swing distillation systems, respectively. While the energy consumption values decrease 60.2% and 43.9% respectively, the heat exchange network energy was further integrated, and the final energy consumption was reduced by 59.2% .

Drug separation / drug loading materials have become one of the significant research objects in controlled drug release and drug preparation technology. In order to select candidates for efficient drug loading from a large number of existing materials and explore their loading mechanisms, 1 000 MOFs materials were extracted from the CoRE-MOF 2019 database for this study, and their adsorptive loading performance the drug ibuprofen was explored by high-throughput calculations. Firstly, the eight structure / energy descriptors of MOFs were analyzed by univariate analysis with the adsorption selectivity ( SSIBU/ N2 ) , adsorption capacity ( NSIBU ) and tradeoff value ( TSN) of MOFs for ibuprofen drug molecules, and the relationship trend between different descriptors and the three performance indicators were preliminarily explored. Secondly, six machine learning models including Random For est, Extreme Gradient Boosting ( XGB) , Gradient Boosting Decision Tree, Light Gradient Boosting Machine, Backpropagation Neural Network, and Support Vector Regression six machine learning algorithms with eight descriptors and three performance evaluation criteria ( Adsorption selectivity SSIBU/ N2 ,Adsorption capacity NSIBU/ N2 and Tradeoff value TSN) for big data training and mining, were used to establish quantitative relationships. The results show that the prediction accuracy of the six ML algorithms is N > TSN > S . For S , XGB showed the best prediction ( R2 = 0。83) . Subsequently, based on the XGB model, the SHaple Additive explanation ( SHAP) method was used to ex plain and analyze the importance of MOF descriptors to performance indicators. The total energy generated during MOF adsorption is considered to be the key influencing factor, and it shows a positive correlation trend with both TSN and NSIBU . Finally, combined with toxicological analysis, a series of high-performance MOF materials were recommended and designed. This work, from molecular level, high-throughput computing to big data mining, systematically studied the adsorption and delivery mechanism of ibuprofen drug molecules in MOF, which provides theoretical guidance for drug delivery materials.

Membership inference attacks in deep learning refer to inferring whether a given sample belongs to the training dataset of a target model. Due to the presence of privacy-sensitive information in the training dataset, defending against membership inference attacks is crucial for privacy protection. This paper begins by defining membership inference attacks and elucidating the underlying reasons causing such attacks. Subsequently, existing defense algorithms are comprehensively reviewed. Finally, a novel defense mechanism is proposed, delineating the defensive approach adopted in this paper. Compared to state-of-the-art defenses against membership inference attacks, this method offers superior trade-offs between preserving member privacy and maintaining model utility. Detailed explanations of the employed techniques are provided to facilitate a better understanding of membership inference attacks and their defenses, thereby furnishing valuable insights for mitigating privacy risks in training datasets and striking a balance between model utility and privacy security.

Since the implementation of policies such as the “ Ten Rules of the Atmosphere, ” particulate matter like PM2. 5 has been better controlled in China, while ozone concentration has shown a rising trend, and has become an important pollutant in China after PM2. 5 . Given that high temperatures can further catalyze ozone production, this study examines the characteristics of temperature and ozone concentration and their interrelationship in South China. Using temperature data from the ERA5 reanalysis data ( ERA5Land Hourly) provided by the European Centre for Medium Range Weather Fore casts ( ECMWF) and ozone concentration data from ground level air quality monitoring stations, we investigated the spatial and temporal distribution patterns of temperature and ozone, their correlation, and the variation of ozone concentration with distance from the coast in 2015 and 2020. The findings reveal the following: ①Spatially, both temperature and ozone concentrations exhibit spatial autocorrelation, with distinct cold and hot spot patterns; temporally, both variables display seasonal variations, peaking in summer and fall and decreasing in winter and spring. ②A positive correlation exists be tween temperature and ozone concentration, with the relationship being most pronounced on an hourly scale ( r = 0.97 in 2015 and r = 0. 96 in 2020) . ③Ozone concentration varies with coastal proximity, peaking within 10 - 50 km of the coast and displaying a fluctuating decline in the 50 - 300 km range.④Ozone suppression occurs at a cutoff temperature of 28 ℃ in South China. This study provides valuable insights for ozone mitigation and regional environmental protection efforts by exploring the spatial temporal characteristics of temperature and ozone concentration, their correlations, and the influence of coastal distance on ozone levels.

Cluster algebra is an important research object in algebra. Cluster algebra is a kind of com mutative subalgebra of a rational function field which satisfies some mutation rule by taking cluster variables as generators. There are some research results on the cluster algebra A( b, c) of rank 2. In particular, when bc≤4, A( b, c) is of two types of algebras with finite type and affine type. Nowadays, cluster algebra plays an important role in Poisson geometry, representation theory, quantum group and other research fields. This paper studies the algebraic structure of a special class of generalized cluster algebras, mainly by defining sn ( n≥1) to establish the multiplication formula of such generalized cluster algebras, and thus proves that the set of all cluster monomials xpm xqm+1 ( m∈Z) and sn( n≥1) is an integer base of such generalized cluster algebras.

The mixture exponential decay model plays an important role in pharmacokinetics and chemical kinetics. Different from the previous research method which was transformed into a linear model according to Taylor′s development, based on the theory of R-optimal design, this paper uses a nonlinear optimization method, Shengjin formula and interior point method to deduce R-optimal design under the model when the two decay parameters are equal. Meanwhile, the R-optimal design algorithm is given when the two decay parameters are unequal. It is verified by the equivalence theorem that the derived design is R-optimal.

Territorial space evaluation is the basic requirement for promoting the high quality development of territorial space, and it has important value and significance. Applying the knowledge map ping analysis method based on Citespace software, the current research status of China’s land space e valuation is explored in terms of basic theory, research content, evaluation indexes and evaluation methods, etc. The results show that: the number of land space evaluation publications increased rap idly after 2018, most of them are intra region cooperation among the authors of the publications, and dual evaluation, comprehensive evaluation, and triple space are the hot spots of the research; the research content is focused on the evaluation of the suitability of territorial space development, evaluation of the carrying capacity of resources and environment, evaluation of the development potential of territorial space and evaluation of the sensitivity of ecological environment, and the evaluation index system is also constructed around these four aspects; the evaluation methods are diversified and applicable to different types of territorial space evaluation. Future research should be carried out in the three major aspects of improving the research scale, optimizing the index system and upgrading the e valuation technology, so as to enrich the theoretical and methodological system of land space evaluation research.

This article mainly utilizes the recursive relation of tensor product decomposition formulas for all irreducible complex representations of a dihedral group, and obtains the adjoint subring of the complex representation ring over r( Dn ) . By studying the indecomposable Z+-sub-bimodules over the adjoint subring, the universal grading structure of the fusion ring r( Dn ) is characterized.

To examine the core features of resilience among Chinese students and to compare the differences in psychological resilience networks between first-generation and non-first-generation college students, a survey was conducted on 3 017 college students ( consisting of 2 166 first-generation college students and 851 non-first-generation college students) using the ConnorDavidson Resilience Scale. Network analysis methods were used for network model construction, centrality analysis, and network comparative analysis. The results showed that: ①The item with the highest centrality of resilience network structure was “ I can achieve my goals” ; ②There was no significant difference in the network structure and network connection strength of resilience between first-generation college students and non-first-generation college students; ③Among first-generation college students, “ I will do my best regardless of the outcome” was the item with the highest centrality, whereas among non-first-generation college students, “ I consider myself a strong person” was the item with the highest centrality. Therefore, in the future, the resilience intervention of college students can be classified and accurately implemented, and the items with the highest centrality will be used as the target for the intervention of first-generation college students and non-first-generation college students.

Previous studies have shown that the quasi maximum exponential likelihood estimation based on high frequency data can improve the estimation accuracy of GARCH model, but few studies have derived the corresponding test statistic for this estimator. In this paper, a portmanteau Q test statistic is proposed based on the asymptotic property of quasi maximum exponential likelihood estimation of GARCH model based on high-frequency data. The theoretical correctness of the test statistic is vali dated through simulation in this paper, and specific applications are provided by using the data of the CSI 300, CSI 500, and SSE 50 indices. The results show that when the model is adequate, the distribution of the test statistic proposed in this paper more closely follows the theoretically derived distribution, which is better than the results of the test statistic based on low-frequency data. Moreover, the statistic is able to capture high-frequency residual autocorrelation due to the inclusion of high-frequency information. While for low-frequency residual autocorrelation, the statistic can also identify model non-sufficiency when the correlation is stronger, which is useful for order identification in GARCH model. Empirical research also indicates that the test statistic can identify the effective utilization of high-frequency information by the models based on high-frequency data, demonstrating a certain degree of practicality.

As robot technology becomes more widespread, its applications in various fields such as daily life, industry, and services have significantly increased. In practical scenarios, robots performing machining tasks are often influenced by external factors or system errors, leading to deviations from the intended path and affecting task completion. This paper aims to investigate the problem of deviations from the intended trajectory during the motion of robot manipulators, with a focus on optimizing compensation for the deviation distance. The research involves the use of a locally weighted method to adjust the deviation distance, reducing the impact of measurement errors. Additionally, a physical impact function is proposed, considering physical factors such as moment of inertia, dynamic friction, and centrifugal force on the deviation distance. The research findings indicate that when ro bot manipulators are chamfering corners, the pre compensation algorithm for deviation distance re duces the deviation distance error from an initial uncorrected range of approximately 0 .22 mm to 0 .83 mm to a range of 0 .02 mm to 0 .34 mm, with a reduction in deviation fluctuation of about 52 .46% . This is significant for improving work efficiency and reducing deviation errors.

Dengue fever is an acute infectious disease caused by the transmission of dengue virus by the main vectors Aedes albopictus and Aedes aegypti. At present, a feasible method to control the transmission of dengue fever is to release mosquitoes carrying Wolbachia to produce a CI effect with wild mosquitoes, so as to block the transmission of the disease. The competition mechanism between different mosquitoes will affect the effectiveness of releasing Wolbachia carrying mosquitoes. Therefore, in order to explore the effects of interspecific competition and mating between Aedes aegypti and Aedes albopictus on mosquito population dynamics, this paper established a population competition model to simulate the population dynamics of Aedes aegypti and Aedes albopictus under different conditions, based on the experiment and latest research results of the preferential interspecific mating between Aedes albopictus and Aedes aegypti. The global asymptotic stabilities of the trivial equilibrium point, boundary equilibrium point and positive equilibrium point are proved. The theoretical results of this study are consistent with the experimental results in the literature, that is, the high interspecific mating and remating rate of Aedes albopictus leads to its advantage in the competition and reproduction with Aedes aegypti. Understanding this mechanism will help prevent and control the vector mosquitoes. This paper helps to provide scientific guidance on the subsequent development of release strategies for Wolbachia infected mosquitoes to control the spread of dengue fever.

An acrylate copolymer dispersant P(BA-AA-HEA) was synthesized by free radical solution polymerization using butyl acrylate (BA), acrylic acid (AA) and hydroxyethyl acrylate (HEA) as monomers. The polymer was characterized and analyzed by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (GPC). P(BA-AA-HEA) was applied to the dispersion of ultrafine aluminum hydroxide powder particles in an epoxy resin matrix. The effects of the addition amount of P(BA-AA-HEA) on the viscosity, anti-sedimentation, stability and shear strength of aluminum hydroxide-epoxy resin composites were investigated, and compared with commercially available Y016 dispersant. The results show that both P(BA-AA-HEA) and Y016 dispersants can make the aluminum hydroxide powder particles more easily dispersed in the epoxy resin matrix, which effectively making the aluminum hydroxide-epoxy resin composite more fluidity, and the viscosity is reduced by about 60%. At the same time, compared with the commercially available Y016 dispersant, the aluminum hydroxide-epoxy resin composite prepared by the P(BA-AA-HEA) has better anti-settling performance, stability and higher shear strength. Specifically, compared with the Y016 dispersant group, the P(BA-AA-HEA) group has an excellent anti-sedimentation effect of aluminum hydroxide powder particles while maintaining the viscosity of aluminum hydroxide-epoxy resin composite at about 26 000 mPa·s, such as no obvious settlement within 7 days;the shear strength of the material increased from 9.246 MPa to 11.617 MPa after adding P(BA-AA-HEA). The results of this study are expected to be used in the industrial application of epoxy resin system formulations.

The vertical column densities ( VCD) of tropospheric formaldehyde ( HCHO) observed by satellites have become an important means for studying the spatiotemporal evolution of volatile organic compounds ( VOCs) at the regional scale. Exploring the spatiotemporal evolution of HCHO VCD in the troposphere is of great significance for the coordinated control of PM2. 5 and O3 pollution in the Guangdong-Hong Kong-Macao Greater Bay Area ( GBA) and even in Guangdong Province. To explore the spatiotemporal evolution of tropospheric HCHO VCD in the GBA, this research processed Level 2 formaldehyde observations from Ozone Monitoring Instrument ( OMI) using a self-developed oversampling algorithm to achieve kilometer-level monitoring of tropospheric HCHO VCD in the GBA from 2013 to 2022. The influencing factors of tropospheric HCHO VCD in the GBA were diagnosed from the perspectives of natural and anthropogenic sources. Research has found that the HCHO VCD of GBA showed a rising trend from 2013 to 2022. Compared with 2013, HCHO VCD increased by 11 3% in 2022. Low HCHO VCD are mainly distributed in the surrounding areas of the GBA with higher terrain and coastal areas, while high VCD are mainly located in the central area of the GBA, with Guangzhou, Foshan, Dongguan as the high value center region, as well as parts in Zhaoqing, Huizhou, and Jiangmen. The average VCD in GBA shows a periodic pattern of winter < spring < autumn < summer. Cities such as Zhaoqing, Dongguan, Guangzhou, and Foshan exhibit winter < spring< autumn < summer, while coastal cities including Jiangmen, Zhongshan, Shenzhen, Hong Kong, and Zhuhai present winter < spring < summer < autumn. The increase in vegetation in the GBA holds a positive contribution to the rise in tropospheric HCHO VCD, but it is not very significant. The correlation coefficient between nighttime light radiation intensity and tropospheric HCHO VCD is not high, while the annual GDP of GBA shows a significant positive correlation with tropospheric HCHO VCD, indicating that GDP growth plays an important role in the ascension of tropospheric HCHO VCD.

Spatial averages have been widely used in scientific research and practical applications since they were proposed. How to estimate the weight coefficient in the spatial average has been a problem studied by many scholars. In the case of missing data, the spatial average is the ratio of the two random variables R = ∑ βi si ri as well as S = ∑ βi si . In this paper, we use the “ Delta method”to derive approximate formulas for the squared bias, variance, and mean squared error of the estimatorr used to estimate the true spatial average, assuming that the weight βi is known. The bias of the estimator r and the source of variance are analyzed, and the spatial average estimated weight to minimize the bias is given. Finally, the obtained results are applied to the global relative abundance data of ammoniating archaea.

The SM2 signature algorithm is an essential component of commercial cryptography systems in China and has been widely applied in various fields. However, the risks associated with private key leakage and the issue of forward security in signatures continue to receive significant attention. To address these concerns, this paper proposes a puncturable signature scheme based on SM2 (SM2-PS), ensuring historical signatures' security even during key leakage. The SM2-PS scheme supports puncturing specific parts of a message, and its key puncturing operation requires only a single deletion of critical elements from a Bloom filter. Under the assumption of the elliptic curve discrete logarithm problem, the SM2-PS scheme enjoys existential unforgeability against chosen-message attacks. Performance analysis and comparisons show that the SM2-PS scheme improves computational efficiency in key generation and signature verification by up to 51.83% and 94.43%, respectively, while the signature length is only 0.156 KB.

Ammonia (NH₃) detection plays a crucial role in various fields, including environmental analysis, air conditioning compressors, respiratory diagnostics, and the fertilizer industry. As a key concern in environmental and safety monitoring, its corresponding sensors are particularly important. Although traditional NH₃ sensors have seen improvements in detection speed, there are limitations to their functions such as high operating temperatures. This underscores the necessity to develop sensors capable of rapidly detecting NH₃ at room temperature. This study employs a liquid-phase laser ablation method to synthesize micro-nano tungsten trioxide (WO₃) materials with high oxygen vacancies for highly efficient room-temperature NH₃ sensors. The preparation method demonstrates advantages such as excellent controllability, high purity, high production efficiency, and simple equipment requirements. The synthesized WO₃ material achieves a 56% response to NH₃ at room temperature, outperforming similar sensors, showing promising potential for developing high-performance room-temperature NH₃ sensors.

Convolution is the core component of convolutional neural networks, and its performance significantly impacts the network's efficiency. Current convolution optimization methods focus on both computational speed and memory usage. By compactly organizing the input image into two-dimensional matrices, the MEC approach reduces the intermediate matrix's memory overhead and is a memory-efficient convolution acceleration technique. However, In the processing of large-scale inputs, generating multiple tall and narrow two-dimensional block matrices fails to fully exploit the peak performance of matrix multiplication, resulting in decreased computational efficiency. This paper proposes a convolutional optimization algorithm CMEC based on three- dimensional block matrices. First, data is acquired by sliding a three- dimensional window across the original image, and rearranging the input image and kernel into three- dimensional intermediate matrices. Further, the input block matrix and kernel matrix are multiplied in parallel, and a highly optimized matrix acceleration library is utilized to enhance the computational speed. Finally, the computational results are converted to the standard output format. The experimental results show that, compared with the MEC algorithm, the CMEC algorithm has the same memory usage of the intermediate matrix, but achieves an average performance improvement of 61% on the CPU for computing a single convolutional layer, up to 71% on the GPU, and obtains at least 50% performance improvement in the convolutional neural network.

Anti-homomorphism is the map reversing operation which plays the same role with homo- morphism, it is essential in the study of structures and properties of algebraic systems. According to the isomorphism theorems of homomorphism in rings, this paper parallels the anti-homomorphism to the structure of ring theory and gives isomorphism theorems under anti-homomorphism in order to characterize more results about the structure and properties of rings.

The Three Gorges Reservoir area is the hardest hit area for landslide occurrence in China, and the dams water storage and flood discharge accelerated the slope activities along the Yangtze River and its tributaries, reactivating a large number of ancient landslides. The Songjiawuchang landslide occurred in Dongdukou Town, Badong County. In this paper, the time series deformation of this land slide was obtained by collecting 15 views of ALOS2 / PALSAR2 images from April 2020 to September 2021, and the area was divided according to the stratigraphic distribution and the slip pattern, with an emphasis on analysing the characteristics and causes of the slip. In addition, the reliability of the de formation results was verified by statistical stability region information. The results show that: ① During the monitoring period, the Songjiawuchang landslide showed an ‘ upper section middle section lower section stepped slip, with a bias towards the right side, and the largest deformation appeared in the right side of the middle section ( Q2R) , with a rate of - 193 9 mm / yr. ② Through the extraction of the profile lines and feature points, the temporal and spatial morphology of the landslide deformation was further explained, and it was found that the stepped slip was consistent with the stratigraphic distribution; ③ Using the Pearson correlation test, it is concluded that the overall slip rate of the landslide is jointly affected by the cumulative precipitation and water level changes.

Abstract: Endocrine disruptors are difficult to remove from wastewater due to their stable chemical structure, and their continuous release in the aqueous environment remains a challenge of great concern in water treatment. In this paper, a copper-doped graphene like catalyst ( Cu@ IANC) synthesized from algae was constructed with Cu-centered electron-rich regions and Cu-centered electron-poor regions. In the reactive aqueous solution containing bisphenol A ( BPA) and 10 mM H2O2 , the degradation of BPA by Cu@ IANC exhibited excellent activity and stability. In the reactive aqueous solution, BPA was complexed in the electron-poor region on the Cu@ IANC surface by π-π and hydrogen bonding, while H2O2 was adsorbed in the electron-rich region on the Cu@ IANC surface, resulting in the formation of a multipoint adsorption pattern on the Cu@ IANC surface. In this adsorption mode, BPA was electronically delocalized by the Cu-π electrostatic force and captured by H2O2 to generate hydroxyl radicals ( · OH) . The generated · OH was free in aqueous solution to attack BPA and its intermediates. The synergistic interaction of H2O2 and Cu-π electrostatic forces over biochar-based Fen- ton-like catalysts is a low-cost option for the effective degradation of environmental endocrine.

In order to improve the catalytic activity of catalysts for the catalytic oxidation of CO, a batch of xMn / CeO2-L ( nanowire) catalysts with different manganese ( Mn) loading amounts were prepared by hydrothermal method and wet impregnation method. The effect of different Mn loading amounts on the catalytic performance of cerium based catalysts was investigated. According to the evaluation of CO activity, 0. 75Mn / CeO2-L catalyst showed the best catalytic performance ( T50 = 129℃ , T90 = 179 ℃ ) , which was about 221 ℃ and 171 ℃ lower than that of CeO2-L catalyst, significantly improving the CO catalytic activity of cerium based catalysts. X-ray powder diffraction( XRD) , N2 adsorption desorption determination ( BET) , X-ray photoelectron spectroscopy ( XPS) ,Raman and H2 temperature reduction procedure ( H2-TPR) characterization were carried out. There sults showed that 0.75Mn / CeO2-L catalyst had higher oxygen vacancy content, indicating that an appropriate amount of Mn loading could enhance the oxygen vacancy of CeO2-L catalyst. In addition, the electrical conductivity of the catalyst was tested by the four-probe method, and it was found that there was a linear correlation between the electrical conductivity of the catalyst and the catalytic activity ( R2 ( T50 ) = 0.998 and R2 ( T 90) = 0.998) and the oxygen vacancy ( R2 ( I D/ I F2g) = 0.999) . The results show that for pure CeO2-L catalysts, loading Mn can effectively increase the electrical conductivity of xMn / CeO2-L catalysts, thereby promoting the ion migration rate on the catalyst surface and enhancing the catalytic activity of xMn / CeO2-L. This experiment is conducive to the realization of low-temperature and high-efficiency catalysis in the vehicle exhaust gas treatment system and reducing CO pollution.

This paper studies the automorphism group of the complex representation ring r( D4 ) of the dihedral group D4 of order 8 and all the ring automorphisms of r( D4 ) are computed. It is shown that the automorphism group of r( D4 ) is isomorphic to the direct product of the symmetric group of degree 3 and the cyclic group of order 2.

In the research of Boolean functions, there is an important problem: given a subset A ={ ( λi , a ) | λi∈Fn , ai∈Z, i = 0, 1, 2, … , m - 1} , find all the Boolean functions f in n variables, such that f^( λi ) = ai for all i = 0, 1, 2, … , m - 1, where f^( λi ) is the Walsh spectral value of the Boolean function f at the address λi . In general, this problem is quite difficult. But if the given set of addresses is a vector subspace of Fn , there is a simple solution. This paper, gives an algorithm called WDC Algorithm, that can solve this problem efficiently in this special case. The WDC Algorithm contains the following three parts: ① constructs all the Boolean functions that satisfying all these conditions;② finds the number of such Boolean functions; and ③ gives a necessary and sufficient condition of the spectral distribution on the subspace to ensure the existence of such Boolean functions. On the other hand, the Bent function is the Boolean function that has the maximal nonlinearity, thus possessing excellent cryptographic properties. This paper uses WDC algorithm to find all 6 - variable Bent functions by means of computer searching, the total number of such functions is 5 425 430 528.

In this paper, we prove the local existence and uniqueness of solutions to the evolutionary model for magnetoviscoelasticity in R2 , R3 . This model consists of an incompressible Navier Stokes, a regularized system for the evolution of the deformation gradient and the Landau Lifshitz Gilbert system for the dynamics of the magnetization. Our approach depends on approximating the system with a sequence of perturbed systems.

Quantum walks benefit from the superposition property of probability amplitudes, allowing them to appear on multiple paths simultaneously, thereby achieving quadratic or even exponential acceleration in the diffusion of quantum information. This study focuses on the discrete-time quantum walk (DTQW) search algorithm within the framework of an undirected graph G=(V, E). By employing unitary transformations of coin and shift operators, a stepwise framework for the DTQW search algorithm is constructed. The SKW search algorithm of DTQW is specifically applied to searching for the marked node states in a 4-node undirected graph. Through state collapse observation, the target node is retrieved probabilistically with a success rate of 1/4. Results indicate that when n sufficiently large quantum systems maintain strong entanglement, quantum walks can transition to classical random walks. The paper further elaborates on the quadratic speedup mechanism of the DTQW search algorithm under bidirectional migration conditions.

Precision components are widely used in various industries, including national defense, medical devices, aerospace, and electronics. They are among the fundamental elements for realizing the grand vision of “ Made in China 2025. ” However, during the processing of precision components, surface defects such as cracks, pitted surfaces, and scratches are inevitable, which leads to a decline in the quality and precision of the components. Furthermore, these surface defects will affect the performance and lifespan of the equipment. Therefore, effective detection of surface defects is crucial. To address the issues of missed and false detections of metal surface defects and to improve detection accuracy, this paper proposes an improved YOLOv5s model for surface defect detection in metal components. First, considering that metal surface defects often present as streaks or spots which express as relatively simple types, a lightweight GhostC3 module is designed by generating feature maps using fewer parameters and resulting in reduced computational complexity. Second, given the characteristics of defects such as pitted surfaces and rolled in scale which are generally small and unevenly distributed, a Concat-BiFPN module based on a bidirectional feature pyramid network was designed. This module makes full use of the ability of BiFPN to fuse features at different scales, and improves the accuracy and stability of small target detection. Finally, the SIoU loss function is utilized, which considers the shape and spatial relationships of targets to better capture the positional relationships of different targets among the image, thus resulting in enhancing the precision of target localization. Ablation and comparative experiments on the NEU DET dataset demonstrate that the proposed method achieves higher multi class average precision with a significantly reduced number of parameters.

In physical engineering, due to the different materials of objects, there is an object composed of two different materials, and the structure of different areas in an object will be different. For this reason, the eigenvalue problem of two phase elliptic partial differential equation is discussed when there are two different materials in one object. In one dimension, it is equivalent to the eigen value problem of ordinary differential equation. In two dimensions, the system is transformed into one dimension eigenvalue problem by the method of separating variables. According to the characteristics of boundary conditions, the eigenvalues and eigenfunctions are obtained by using block regions.

In laser soldering, the Precise control of the temperature of the weld joint is critical to the quality of the weld. Existing soldering temperature control for laser soft brazing is realized based on Proportional-Integral-Differential ( PID) control. The traditional PID control method cannot effectively deal with the problem of brazing material specific heat capacity and laser absorption rate changing with temperature due to its fixed parameters. In the process of using the traditional PID to control the temperature, the response speed and control accuracy of the system are reduced, the error value between the actual output temperature and the target temperature is large, and the output power fluctuation is also large. For this reason, this paper proposes a temperature control method based on Model-Predictive Control ( MPC) , which can dynamically adjust the control parameters and reduce the hysteresis or overshoot of PID when facing temperature changes by predicting the future temperature changes using a process model. Experimental results show that the MPC method significantly improves the temperature control accuracy of the solder joints, with a temperature error variance value of 32% of that of PID control and a maximum absolute error of 67% of that of PID control. These improvements effectively enhance the wettability and fluidity of the brazing material, improve the uniformity and solder quality of the solder joints, and significantly enhance the yield of laser soft brazing.

As an effective mode of industrial spatial organisation, industrial parks have a special role in driving regional economic growth. This study analyzes the basic characteristics of the 111 industrial parks in the Pearl River Delta, and explores the mechanisms of different industrial parks on county economic growth by type. The results show that: ①The characteristics of industrial parks in the Pearl River Delta show that the construction of industrial parks is conducive to promoting the economic growth of counties;however, the intensity of the role of different levels of industrial parks on the county economy has a decreasing trend, in the order of national,provincial,important level industrial parks.②The mechanisms by which industrial parks with different levels of innovation drive county economic development are different, and are explained as the result of three different effects: multiplier effect, agglomeration effect and spillover effect. Industrial parks with low levels of innovation drive the county's economic development through the regional multiplier effect of providing employment for the county;industrial parks with high levels of innovation drive the county's economy through the technology spillover effect, but it is relatively weak;and industrial parks with medium levels of innovation have no clear role in the competition for local resources, as the negative effect of competition for local resources cancels out with the positive effect of external spillovers.

Metal organic frameworks ( MOFs) , with their diverse chemical structures, exhibit broad application potential in fields such as gas storage and separation, catalysis, and drug storage and de livery. With the rapid expansion of MOFs varieties and application domains, traditional experimental methods and molecular simulations can no longer sufficiently evaluate the performance of new MOFs in a short time. Given the vast number of MOFs and the enormous amount of data related to their structures and properties, integrating machine learning methods into the design and development of MOFs will undoubtedly bring significant benefits. By constructing machine learning models, the complex structure property relationships of MOFs can be effectively elucidated, accelerating the performance prediction and material design processes. In this review, we comprehensively summarize and analyze research on MOFs adsorption and separation utilizing machine learning methods. First, various MOFs databases, feature descriptors, algorithms, and evaluation metrics suitable for machine learning work flows are discussed. Next, the role of machine learning in facilitating high throughput computational screening and accelerating research on the adsorption and separation of gases such as CH4 , CO2 , and H2 in MOFs are explored. Finally, this paper discusses the opportunities and challenges faced by ma chine learning in supporting big databased computational simulations of MOFs gas adsorption, separation, and storage. Through this comprehensive review and analysis, researchers can better understand and apply machine learning and big data mining to accelerate the design and development of MOFs, providing new research directions and technical support for related fields.

The establishment and optimization of ecological networks in strategic locations is a useful strategy to enhance the connection of regional landscape structures and the general functioning of ecosystems, taking into account the spatial distribution and connectivity of ecosystem service values. There isn't enough research being done in this field right now. The study used land use data from 2000 to 2020 to determine the future ecosystem service value of the Nanling Mountains region, identify high-value locations, and maximize the value of the ecosystem network. It was based on the PLUS-InVEST model and the “source-corridor” paradigm. The ecological network in the Nanling Mountains region was established and optimized by identifying high value locations, and the future value of ecosystem services in the Nanling Mountains region was computed using land use data from 2000 to 2020. The findings indicate that: The typical ecosystem service value of the region exhibits a general fluctuating and decreasing trend, with the lowest value predicted for 2030;the landscape composition is relatively stable within the total area of about 114 000 km² of the Nanling Mountains area, with woodland as the dominant type;with the ecological source area in a regulated distribution and more fragmented edges, the ecological network of the Nanling Mountains region exhibits a spatial distribution that is dense in the west and sparse in the east. The study elucidates the critical domains for ecological network optimization, derived from the goal of giving priority to the preservation of ecological pinch points and emphasizing the rehabilitation of ecological barrier points. The study's findings offer evidence in favor of enhancing the ecosystem service network's spatial structure and creating a pattern of long-term ecological security.

This paper uses qualitative and quantitative empirical research methods to analyze the policy effects of the Hydrogen fuel cell vehicle industry. To deeply explore the main factors that affect the development willingness of enterprises in terms of policy understanding, policy adaptability, policy implementation effectiveness, and policy involvement, the SEM model is used to analyze the influencing factors and their mechanisms in depth. Research has found that ① the effectiveness of policy implementation is the most significant direct factor affecting the willingness of enterprises to develop, and the introduction of policies has a direct support and impact effect on enterprise development;② the adaptability of enterprises to the introduction of policies for the hydrogen fuel cell industry is not optimistic;③ the current government support policies are not ideal for supporting enterprises;④ the overall involvement score of enterprises in support policies is average;the level of importance attached by enterprises is deeper than their level of understanding, and their understanding of policies is not high, with only 18.18% indicating "very satisfied". Therefore, based on these research findings, it is proposed that the government should focus on improving policy adaptability and policy involvement, pay attention to enterprise issues, optimize policy rationality, adjust policy orientation in a timely manner, and strengthen policy publicity and guidance, among other highly targeted policy recommendations.

People′s health is the foundation of social civilization and progress, and an important symbol of national prosperity and strength. The Party and the country prioritize the people′s health in their strategic development, proposing the ″Healthy China″ strategy. In August 2016, the Political Bureau of the CPC Central Committee held a meeting to review and adopt The Outline of the Healthy China 2030 Plan, which has made institutional arrangements to better protect people′s health at present and in the future. However, there is still a lack of theoretical interpretation and practical research on the construction of a Healthy China from a geographical perspective. From the perspective of Chinese traditional culture, this paper puts forward the basic connotation of Healthy China construction, takes man-land relationship, spatial analysis and regionalization theory as the core theoretical basis of geography serving Healthy China construction. Based on the outline of the Healthy China 2030 Plan, an evaluation index system for the construction of Healthy China has been established with reference to the health evaluation indicators formulated by the World Health Organization, including five dimensions: health status, health risk, health service, health system and healthy life. Based on this, the progress of Healthy China construction in China is evaluated in accordance with the Sustainable Development Goals of the United Nations, and a geographical path of Healthy China construction is explored. This study has a positive significance for the planning of Healthy China according to local conditions, fully reflecting the scientificity, rationality and fairness of the construction, and provides a scientific basis for China to complete the goals of the program within the specified time, achieve the United Nations Sustainable Development Goals and the requirements of the World Health Organization, and realize the general goal of comprehensively improving the health of the people.

In the contemporary emphasis on maintaining social stability and industrial safety, the issue of low-temperature icing, induced by environmental factors affecting transportation, large-scale machinery, and power transmission lines, stands as an urgent challenge requiring immediate attention. Over the past few years, the rapid development of traditional Superhydrophobic Surface(SHBS) anti-icing coatings has been notable; however, these coatings have also revealed significant limitations, particularly their tendency to lose hydrophobic and anti-icing properties under extreme conditions. In contrast, Superhydrophobic(SH) coatings with photothermal effects have demonstrated sustained effectiveness in harsh environments, offering a promising avenue for further research. This paper begins by elucidating the mechanisms of surface icing, detailing the process by which liquid droplets condense on substrate surfaces. It then reviews various photothermal materials and traditional methods for preparing SHBS. Subsequently, the paper illustrates several composite preparation techniques for SHBS with photothermal effects through specific examples. Finally, after a concise explanation of the photothermal SH anti-icing mechanism, the paper highlights the current limitations of photothermal SH anti-icing surfaces and outlines potential directions for future research.