Cold Regions Science and Technology最新文献

{"title":"Study on the propagation of plane longitudinal waves at the interface between saturated frozen soil and saturated soil","authors":"Jialun Zhang ,&nbsp;Qiang Ma ,&nbsp;Fengxi Zhou ,&nbsp;Zhenning Ba","doi":"10.1016/j.coldregions.2025.104643","DOIUrl":"10.1016/j.coldregions.2025.104643","url":null,"abstract":"<div><div>Due to global warming and intensified human activities, the thawing of permafrost in some regions during summer has resulted in the formation of a saturated soil–saturated frozen soil geological interface. In response, this study establishes a wave propagation model for elastic waves at the interface between saturated frozen soil and saturated soil media, based on elastic wave propagation theory in porous media. Numerical calculations and three-dimensional visualization techniques are employed to analyze the influence of various parameters—such as incident frequency, incident angle, porosity, Poisson's ratio, and temperature in the saturated frozen soil, as well as porosity and Poisson's ratio in the saturated soil—on the amplitude transmission/reflection coefficients and energy flux at the interface. The results show that higher wave velocities enhance the resistance of transmission and reflection coefficients and energy flux to changes in incident frequency. Variations in the parameters of the saturated frozen soil medium, such as temperature, Poisson's ratio, and porosity, have a greater impact on reflected waves than on transmitted waves. Conversely, changes in the parameters of the saturated soil medium have a greater effect on transmitted waves than on reflected waves. When porosity or Poisson's ratio is varied within the same range in both media, some transmission/reflection waveforms exhibit completely opposite trends in amplitude coefficients and energy flux with respect to parameter variation.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"240 ","pages":"Article 104643"},"PeriodicalIF":3.8,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144889947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of Thaw-Hazard susceptibility in permafrost regions using multisource data and machine learning: A case study in Qinghai Province, China","authors":"Gang Wei ,&nbsp;Hualiang Zhu ,&nbsp;Xianwei Zhang ,&nbsp;Zejun Xia ,&nbsp;Qingzhi Wang ,&nbsp;Bo Kang ,&nbsp;Lei Yan ,&nbsp;Xinyu Liu","doi":"10.1016/j.coldregions.2025.104648","DOIUrl":"10.1016/j.coldregions.2025.104648","url":null,"abstract":"<div><div>Thaw hazards in high-latitude and glaciated regions are becoming increasingly frequent because of global climate warming and human activities, posing significant threats to infrastructure stability and environmental sustainability. However, despite these risks, comprehensive investigations of thaw-hazard susceptibility in permafrost regions remain limited. Here, this gap is addressed by a systematic and long-term investigation of thaw hazards in China's Qinghai Province as a representative permafrost area. A detailed inventory of 534 thaw-hazard sites was developed based on remote sensing, field verification, and surveys by a UAV, providing critical data for susceptibility analysis. Eleven environmental factors influencing thaw hazards were identified and analyzed using information gain and Shapley additive explanation. By using the random forest model, a susceptibility map was generated, categorizing the study area into five susceptibility classes: very low, low, moderate, high, and very high. The key influencing factors include precipitation, permafrost type, temperature change rate, and human activity. The results reveal that 17.5 % of the permafrost region within the study area is classified as high to very high susceptibility, concentrated primarily near critical infrastructure such as the Qinghai–Tibet Railway, potentially posing significant risks to its structural stability. The random forest model shows robust predictive capability, achieving an accuracy of 0.906 and an area under the receiver operating characteristic curve of 0.965. These findings underscore the critical role of advanced modeling in understanding the spatial distribution and drivers of thaw hazards, offering actionable insights for hazard mitigation and infrastructure protection in permafrost regions under a changing climate.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"240 ","pages":"Article 104648"},"PeriodicalIF":3.8,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of cooling-induced salt crystallization on the shear strength of sulfate saline soils","authors":"Yanjie Ji ,&nbsp;Bing Bai ,&nbsp;Xu Li ,&nbsp;Hong-huan Cui","doi":"10.1016/j.coldregions.2025.104644","DOIUrl":"10.1016/j.coldregions.2025.104644","url":null,"abstract":"<div><div>Sulfate saline soils are widely distributed in Northwest China, where significant diurnal temperature fluctuations promote salt crystallization during cooling, even above 0 °C. This alters soil properties and poses challenges to engineering stability. To investigate this, the effects of salt crystallization on shear strength were systematically examined through theoretical analysis and laboratory direct shear tests. Crystallization significantly reduced void ratio and free water content while enhancing shear strength. The crystallized soil exhibited a unique shear strength pattern: an initial decrease, followed by an increase as the water content increased. Both cohesion and internal friction angles increased after crystallization. The cohesion progressively improved with higher crystallized salt content (&gt;6.2 %), whereas the internal friction angle remained relatively stable. A corrected Bishop effective stress model was proposed to describe the process of increasing the strength of saline soil with an increase in crystallization amount, and it showed good performance.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"240 ","pages":"Article 104644"},"PeriodicalIF":3.8,"publicationDate":"2025-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical properties and damage evolution of three-dimensional random porous sea ice based on meso-scale analysis","authors":"Aobo Zhang ,&nbsp;Biye Yang ,&nbsp;Guiyong Zhang ,&nbsp;Peng Lu ,&nbsp;Borui Yang ,&nbsp;Xi Yang","doi":"10.1016/j.coldregions.2025.104640","DOIUrl":"10.1016/j.coldregions.2025.104640","url":null,"abstract":"<div><div>The microstructural characteristics of sea ice influence its macroscopic fracture behavior. Elucidating the inter-scale mechanical mechanisms remains a pivotal challenge. In this paper, a three-dimensional mesoscale numerical model is proposed to model the sea ice based on the Monte Carlo method, addressing the limitations of existing models in reconstructing sea ice morphology and capturing failure details. The microstructure of sea ice is incorporated, considering the randomly distributed spherical and cylindrical pores representing air bubbles and brine inclusions. Using porous sea ice numerical model with verified material parameters and mesh sizes, the tensile and compressive strengths of sea ice is calculated, which agree well with experimental data. Furthermore, the fracture behaviors of sea ice following tensile and compressive failures are consistent with experimental observations, demonstrating the validity and feasibility of the proposed model. A detailed analysis is conducted on the factors influencing the mechanical properties and damage evolution of sea ice, including the random distribution of pores and porosity. These investigations help clarify the relationship between the mesoscopic structure and macroscopic behavior of sea ice, as well as elucidate its brittle failure mechanisms. The findings also facilitate the prediction of the failure strength and elastic parameters at different porosities.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"240 ","pages":"Article 104640"},"PeriodicalIF":3.8,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144893716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wind turbine ice throw dynamics and aerodynamic interactions: A 6-DOF computational and statistical model for unsafe area identification","authors":"Shahrokh Shams ,&nbsp;Ion Paraschivoiu ,&nbsp;Mahdis Madahi ,&nbsp;Ehsan Karimibadrabadi","doi":"10.1016/j.coldregions.2025.104630","DOIUrl":"10.1016/j.coldregions.2025.104630","url":null,"abstract":"<div><div>The phenomenon of ice throw from modern wind turbines in cold regions poses significant safety and financial risks. This study develops a six-degree-of-freedom numerical model to predict the trajectory, rotation, velocity, and impact areas of ice fragments. The mathematical model is solved using Euler angles, Newton's second law, and Euler's laws of motion, and implemented using the Runge-Kutta method. This approach offers greater accuracy in simulating translation and rotation compared to previous methods. The study also provides a detailed examination of the concept of apparent mass and analyzes its effect along with the influences of angular velocity, aerodynamic forces and moments, wind velocity, and ice mass. Average values for lift, drag, and moments are generally considered. However, Theodorsen's unsteady lift is also considered in this study to examine the effect of apparent mass. The results of this study are used to identify unsafe areas around turbines, and the importance of identifying these areas is highlighted through a case study of a real turbine located near a highway. Finally, Monte Carlo simulations and random data were used to more accurately assess the simultaneous impact of various parameters on the unsafe areas around the turbines. The analysis shows that using 3000 samples provides a reliable estimate of the consequence distance with stable mean and standard deviation values. Increasing the number of samples beyond 3000 results in only marginal improvements in accuracy while significantly increasing computational costs. Therefore, 3000 samples represent an optimal balance between precision and efficiency in risk assessment. The findings of this study can be utilized for optimizing turbine placement and minimizing risks in cold climate conditions.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"240 ","pages":"Article 104630"},"PeriodicalIF":3.8,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Frost-heaving pressure distribution and evolution in cracked rock under unidirectional freezing condition","authors":"Shuaishuai Niu ,&nbsp;Xuedong Luo ,&nbsp;Shengtao Zhou ,&nbsp;Nan Jiang ,&nbsp;Xinting Zhang","doi":"10.1016/j.coldregions.2025.104629","DOIUrl":"10.1016/j.coldregions.2025.104629","url":null,"abstract":"<div><div>The frost-heaving effect on water-bearing cracks significantly alters the physical and mechanical properties of rock mass and presents a substantial risk to the stability of rock slopes in cold regions. To study the evolution of frost-heaving pressure in rock, a series of unidirectional freezing experiments were conducted on red sandstones with prefabricated cracks under varying crack widths and cooling rates. Through an analysis of the temperature distribution characteristics within the fractures, the evolution of frost-heaving pressure was elucidated, and its peak value was determined using the coupled expansion method, which accounts for both rock and ice within the cracks. Results show that the frost-heaving pressure in cracks of different depths evolves synchronously. However, as depth increases, the peak frost-heaving pressure increases gradually, and at the same depth, the peak frost-heaving pressure increases as crack width increases. The peak frost-heaving pressure at the crack bottom decreases as the cooling rate decreases. The frost-heaving pressure in the middle of the crack first increases and then decreases as the cooling rate increases. Additionally, the theoretical model indicates that the distribution characteristics of residual water are the key factors affecting the frost-heaving pressure distribution. The effect of crack geometry parameters and cooling rate on frost-heaving pressure is controlled by the changes in residual water content. The loss of residual water drives the redistribution of frost-heaving pressure during crack propagation. This study can provide a better understanding of the freeze-thaw weathering mechanism of rock masses in cold regions and provides a reference for calculating frost-heaving pressure in cracked rock masses and for assessing the stability of rock engineering.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"240 ","pages":"Article 104629"},"PeriodicalIF":3.8,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shear failure behavior of the interface between asphalt mixture and ice layer by electromagnetic induction heating","authors":"Lulu Fan ,&nbsp;Wenwei Huang ,&nbsp;Hao Chen ,&nbsp;Gang Liu ,&nbsp;Jinjun Liu ,&nbsp;Yangshi Liang ,&nbsp;Federico Ignacio Ortiz de Zarate ,&nbsp;Inge Hoff","doi":"10.1016/j.coldregions.2025.104627","DOIUrl":"10.1016/j.coldregions.2025.104627","url":null,"abstract":"<div><div>Induction heating has been widely applied for asphalt pavement deicing. However, it is challenging in practice to accurately determine the optimal deicing times, which can lead to inefficiency and extra energy consumption. To address these issues, an electromagnetic induction heating shear deicing detection device was developed to capture the deicing times in this research. The heating characteristics of steel fiber modified asphalt mixtures were investigated under different steel fiber contents, heating distances and currents. The Interface Failure Times (IFTs) were obtained from shear force curves recorded by the device. The response surface methodology was applied to the prediction of the heating characteristics and IFTs. Afterwards, the effects of the texture depth and solution media on the shear deicing behavior were evaluated. The deicing performance of steel fiber coatings with varying areal densities was assessed. The results indicated that the heating characteristics and IFTs were well predicted by the ternary quadratic equation under different test conditions. The deicing times obtained from the IFTs were shorter and more intuitive than the ones derived from the heating rate. The removal of the ice from the mixture surface was hindered by its interaction with the surface texture. The salt ions promoted the generation of bubbles and pores in the ice, resulting in shorter IFTs. In addition, the steel fiber coating improved deicing efficiency by 26.2 % and reduced the steel fiber content by 90.3 % compared to the steel fiber modified asphalt mixture. These findings further contribute to high-efficiency deicing with low energy consumption and cost.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"240 ","pages":"Article 104627"},"PeriodicalIF":3.8,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144809834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulations of compacted snow penetration tests using CTI penetrometer, Clegg hammer, and vane-cone device","authors":"Yogesh Surkutwar ,&nbsp;Mohit Shenvi ,&nbsp;Corina Sandu ,&nbsp;Costin Untaroiu","doi":"10.1016/j.coldregions.2025.104624","DOIUrl":"10.1016/j.coldregions.2025.104624","url":null,"abstract":"<div><h3>Abstract</h3><div>Numerical simulations are essential for assessing tire performance on snowy roads, enhancing safety, traction, and handling. Their accuracy depends on robust constitutive models and numerical methods capable of capturing snow's nonlinear behavior. Many studies rely on traditional FEM methods and calibration-based parameter identification, which limit the accuracy of compacted snow behavior predictions for various loadings. This study develops a systematic methodology for identifying and validating constitutive model parameters of compacted snow (500 kg/m³ density), using laboratory testing data. Experimental data from Direct Shear Tests (DST) and Confined Compression Tests (CCT) were used to determine Drucker-Prager Cap plasticity material model parameters, ensuring accurate representation of compacted snow under shear and compression loading. Then, the material model was verified through numerical simulations of DST and CCT by comparing the results with the experimental data. Simulations of the CTI penetrometer, Clegg hammer, and vane-cone device were also performed using the identified snow material model and different numerical methods including Arbitrary Lagrangian-Eulerian (ALE), Smoothed Particle Hydrodynamics (SPH), and hybrid SPH-FEM. The simulation results were compared to in-situ test data to evaluate the accuracy, stability, and computational efficiency of the numerical methods. In future, the understanding developed in this study could be used in the identification of snow material parameters directly from in-situ penetration data for simulation of regulatory tests (e.g. ASTM F1805) and consequently in virtual validation of winter tire models.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"240 ","pages":"Article 104624"},"PeriodicalIF":3.8,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144865010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On snow hazard mapping over the Chinese mainland by using observational and reanalysis datasets","authors":"L.F. Jiang ,&nbsp;H.M. Mo ,&nbsp;H.P. Hong","doi":"10.1016/j.coldregions.2025.104625","DOIUrl":"10.1016/j.coldregions.2025.104625","url":null,"abstract":"<div><div>Assessment of snow hazard, more specifically the hazard due to snow load, is inherently complex, partly due to insufficient direct measurements of ground snow load and sparse distribution of meteorological stations across regions of interest. In the present study, the extreme ground snow load across the Chinese mainland was assessed using up-to-date surface observational data (SOD) (mostly ground snow depth) and six reanalysis datasets spanning 1979 to 2023. A comparative analysis of the statistics of the annual maximum ground snow load, <em>L</em>_<em>A</em>, and the <em>T</em>-year return period value of <em>L</em>_<em>A</em>, <em>l</em>_<em>T</em>, was conducted across all datasets. The results revealed that the spatial trends of <em>L</em>_<em>A</em> derived from two reanalysis datasets, JRA_3Q and GLDAS_2, closely align with those from SOD. Among the Gumbel, lognormal, and generalized extreme value distributions, the lognormal distribution was preferable for approximately two-thirds of the 1684 stations analyzed when using SOD, JRA_3Q, and GLDAS_2. Furthermore, <em>L</em>_<em>A</em> for 90.8% and 80.1% of the stations was stationary when using SOD and JRA_3Q, respectively, while <em>L</em>_<em>A</em> for 70.2% of the stations increased slightly with GLDAS_2. In general, <em>l</em>_<em>T</em> values obtained from reanalysis datasets differ substantially from those derived using SOD for stations in the Tibetan Plateau and Xinjiang region. However, <em>l</em>_<em>T</em> values for other regions are similar when using SOD, JRA_3Q, and GLDAS_2. Most notably, since the mapped <em>l</em>₅₀ values derived from SOD_SD, JRA_3Q, and GLDAS_2 differ from those specified in the current structural design code, the code-recommended <em>l</em>₅₀ values should be carefully scrutinized and potentially updated.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"240 ","pages":"Article 104625"},"PeriodicalIF":3.8,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation on the strength characteristics of frozen lean clay influenced by anisotropy","authors":"Yu Tang,&nbsp;Jiahui Wang,&nbsp;Ping Yang","doi":"10.1016/j.coldregions.2025.104628","DOIUrl":"10.1016/j.coldregions.2025.104628","url":null,"abstract":"<div><div>Artificial ground freezing (AGF) technology is commonly utilized to stabilize adjacent soils and guarantee the safety during subway tunnel construction by inserting freezing pipes into the ground to form a frozen soil mass. Nonetheless, inclined installation of freezing pipes, aside from the conventional horizontal or vertical configurations, frequently arises due to the complex subterranean pipelines and restricted construction areas. The directional dependence of mechanical properties of lean clay under such conditions remains insufficiently investigated. To address this issue, it is essential to systematically analyze the coupled effect of freezing temperature and sampling angle on the mechanical behavior of lean clay, which is commonly encountered in shield tunnel excavation. Consequently, this study proposed an apparatus and its method for preparing anisotropic clay specimens sampled at various angles ranging from 0° to 90° relative to the natural deposition direction. The anisotropic characteristics of the specimens was verified through the 3D X-ray computed tomography (CT) scanning, focusing on porosity. Uniaxial compressive strength (UCS) tests were then conducted on lean clay specimens prepared by slurry-based consolidation method. The impact of anisotropy on mechanical properties was comprehensively investigated by testing specimens at different sampling angles <em>θ</em> (0°、30°、45°、60° and 90°). The UCS results showed consistent strain-hardening behavior across different sampling angles under subfreezing temperatures of −5 °C, −10 °C and − 15 °C. The combined influences of anisotropy and freezing temperature on the strength of frozen lean clay were discussed by regression analysis. UCS exhibited an exponential decrease with increasing sample angle, and a linear rise with decreasing freezing temperature. A mathematical model was established to predict strength and deformation behavior of lean clay, incorporating the coupled effects of anisotropy and freezing conditions. In addition, the correlation between macroscopic strength and mesoscopic porosity was investigated. The augmentation of porosity resulted in a diminution of frozen soil strength. The research provides a reliable foundation for predicting of mechanical properties of lean clay in the AGF-reinforced engineering of subway tunnel and holds practical engineering significance for disease control.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"240 ","pages":"Article 104628"},"PeriodicalIF":3.8,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}