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榆林市沙漠化演变及其驱动力分析

中国水土保持科学 2024年第2期22卷 9-16页

作者：刘亚辰王苗陶泽兴呼雪梅西安文理学院生物与环境工程学院西安710065 中国科学院地理科学与资源研究所陆地表层格局与模拟重点实验室北京100101 西安地图出版社有限公司西安710054

识别土地沙漠化的影响因素,对制定沙漠化防治对策、促进人与自然和谐发展具有重要意义。基于2000—2014年榆林市沙漠化监测数据和气象数据,采用灰色关联度分析、偏相关分析、主成分分析等方法,研究6种气候因素和8种人为因素对不同沙漠... 详细信息

识别土地沙漠化的影响因素,对制定沙漠化防治对策、促进人与自然和谐发展具有重要意义。基于2000—2014年榆林市沙漠化监测数据和气象数据,采用灰色关联度分析、偏相关分析、主成分分析等方法,研究6种气候因素和8种人为因素对不同沙漠化等级土地面积变化的影响,识别主要驱动因子,并构建沙漠化面积预测模型。结果表明:1)除潜在沙漠化土地面积有所增加外,其余各类型沙漠化土地面积均显著减少;2)前5主成分中,人为因素的累积贡献率为52.98%,气候因素累积贡献率为38.17%,表明沙漠化主要受人类活动影响;3)构建的三次回归模型可较好模拟不同类型沙漠化面积变化,模型解释量达40%~66%。本成果可为评估未来气候变化对沙漠化的影响和制定沙漠化防治对策提供参考。

关键词：沙漠化气候变化人类活动灰色关联度主成分分析榆林市

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建筑企业数字化转型三方演化博弈及仿真分析

沈阳建筑大学学报（社会科学版） 2024年第1期26卷 34-42页

作者：刘亚臣刘兴芝沈阳建筑大学管理学院辽宁沈阳110168

对于建筑企业而言,数字化转型是企业实现可持续发展的核心战略。考虑了政府的奖惩机制,将建筑企业、数字化解决方案供应商与政府纳入统一架构中,以此构建了三方演化博弈模型,利用matlab 2016a软件对三者的演化博弈行为进行了仿真分析。... 详细信息

对于建筑企业而言,数字化转型是企业实现可持续发展的核心战略。考虑了政府的奖惩机制,将建筑企业、数字化解决方案供应商与政府纳入统一架构中,以此构建了三方演化博弈模型,利用matlab 2016a软件对三者的演化博弈行为进行了仿真分析。研究结果表明:政府参与意愿、协同收益、奖惩力度等参数对博弈主体策略演化的影响显著。其中,提高协同收益和加强政府惩罚力度将加快系统演化趋于稳定;政府增强奖励和补贴力度均有利于促进建筑企业数字化转型和增强数字化解决方案供应商的参与意愿,但加大奖励力度将增大政府财政压力,故适度的政府补贴和奖励有利于博弈系统达到理想状态。

关键词：建筑企业数字化转型演化博弈仿真分析

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沈阳市太原街商业区交通改善策略

黑龙江交通科技 2024年第3期47卷 164-167页

作者：韩旭刘亚臣沈阳建筑大学辽宁沈阳110168 沈阳市规划设计研究院有限公司辽宁沈阳110004

在沈阳市城市更新的工作背景下,对太原街商业区的路网结构、交通运行及停车需求展开调查,深入剖析太原街商业区存在的交通问题,提出了交通改善目标,并以问题和目标为导向,重点从优化路网结构、停车综合治理、全面提升公交、重塑慢行网... 详细信息

在沈阳市城市更新的工作背景下,对太原街商业区的路网结构、交通运行及停车需求展开调查,深入剖析太原街商业区存在的交通问题,提出了交通改善目标,并以问题和目标为导向,重点从优化路网结构、停车综合治理、全面提升公交、重塑慢行网络、停车综合治理五大方面提出具体的交通改善策略,提升街区品质,助力太原街商业区的复兴。

关键词：慢行网络交通改善策略研究

Anisotropic time-dependent behaviors of shale under direct shearing and associated empirical creep models

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1262-1279页

作者： yachen Xie Michael Z.Hou Hejuan liu Cunbao Li Shenzhen Key Laboratory of Deep Engineering Sciences and Green Energy Shenzhen UniversityShenzhen518060China Institute of Subsurface Energy Systems Clausthal University of TechnologyClausthal-Zellerfeld38678Germany State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

Understanding the anisotropic creep behaviors of shale under direct shearing is a challenging *** this context,we conducted shear-creep and steady-creep tests on shale with five bedding orientations (i.e.0°,30°,45°,60°,and 90°),under multiple levels of direct shearing for the first *** results show that the anisotropic creep of shale exhibits a significant stress-dependent *** a low shear stress,the creep compliance of shale increases linearly with the logarithm of time at all bedding orientations,and the increase depends on the bedding orientation and creep *** high shear stress conditions,the creep compliance of shale is minimal when the bedding orientation is 0°,and the steady-creep rate of shale increases significantly with increasing bedding orientations of 30°,45°,60°,and 90°.The stress-strain values corresponding to the inception of the accelerated creep stage show an increasing and then decreasing trend with the bedding orientation.A semilogarithmic model that could reflect the stress dependence of the steady-creep rate while considering the hardening and damage process is *** model minimizes the deviation of the calculated steady-state creep rate from the observed value and reveals the behavior of the bedding orientation's influence on the steady-creep *** applicability of the five classical empirical creep models is quantitatively *** shows that the logarithmic model can well explain the experimental creep strain and creep rate,and it can accurately predict long-term shear creep *** on an improved logarithmic model,the variations in creep parameters with shear stress and bedding orientations are *** abovementioned findings,a mathematical method for constructing an anisotropic shear creep model of shale is proposed,which can characterize the nonlinear dependence of the anisotropic shear creep behavior of shale on the bedding orientation.

关键词： Rock anisotropy Direct shear creep Creep compliance Steady-creep rate Empirical model Creep constitutive model

Phenological records in Guanzhong Area in central China between 600 and 902 AD as proxy for winter half-year temperature reconstruction

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Science China Earth Sciences 2016年第9期59卷 1847-1853页

作者： liu yachen DAI JunHu WANG HuanJiong YE Yu liu HaoLong School of Geography Beijing Normal University Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of Sciences

Phenological data obtained from historical documents constitute highly important ecological evidence for the pre-instrumental period, and can be used in analyzing climatic change in history. In this study, 87 phenological records about seasonality of non-biological events(e.g., first frost date), agriculture and ornamental plants(e.g., first flowering date) over 77 years were extracted from historical documents from the Sui and Tang dynasties in China to reconstruct the winter half-year(from October to next April) temperatures in the Guanzhong Area(located in central China) from 600 to 902 AD. Transfer functions between temperature and phenophases with significant correlations were established by using modern observation data. Temperatures from the study period were reconstructed by applying the transfer functions to historical phenological data. The reconstruction indicates that the winter half-year temperatures during 600–902 AD were 0.23°C higher than the reference period(1961–1990). The temperature changed with two distinct stages. During the 600s–800s, temperatures were approximately 0.38°C higher than at present but then temperatures decreased in the subsequent period(800–902 AD). These results are similar to ones from previous studies on the mean temperature and the divisions between warm and cold periods during the study period, though differences were found in the degree of warmness/coldness. This reconstruction provides a valuable contribution to a better understanding of climatic variability during the Sui and Tang dynasties in China.

关键词：冬半年温度关中地区物候期中国历史气候变化代理 AD 历史文献

Effects of fracture evolution and non-Darcy flow on the thermal performance of enhanced geothermal system in 3D complex fractured rock

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International Journal of Mining Science and Technology 2024年第4期34卷 443-459页

作者： yachen Xie Jianxing Liao Pengfei Zhao Kaiwen Xia Cunbao Li Department of Civil and Mineral Engineering University of TorontoToronto M5S1A4Canada College of Water Resources and Hydropower Sichuan UniversityChengdu 610225China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsWuhan 430071China College of Civil Engineering Guizhou UniversityGuiyang 550025China Institute of Geosafety School of Engineering and TechnologyChina University of GeosciencesBeijing 100083China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Shenzhen UniversityShenzhen 518060China

In fractured geothermal reservoirs,the fracture networks and internal fluid flow behaviors can significantly impact the thermal *** this study,we proposed a non-Darcy rough discrete fracture network(NR-DFN)model that can simultaneously consider the fracture evolution and non-Darcy flow dynamics in studying the thermo-hydro-mechanical(THM)coupling processes for heat extraction in geothermal *** further employed the model on the Habanero enhanced geothermal systems(EGS)project located in ***,our findings illustrate a clear spatial-temporal variation in the thermal stress and pressure perturbations,as well as uneven spatial distribution of shear failure in 3D fracture *** shear failure is mainly concentrated in the first fracture ***,channeling flow have also been observed in DFNs during heat extraction and are further intensified by the expansion of fractures driven by thermal ***,the combined effect of non-Darcy flow and fracture evolution triggers a rapid decline in the resulting heat rate and *** NR-DFN model framework and the Habanero EGS's results illustrate the importance of both fracture evolution and non-Darcy flow on the efficiency of EGS production and have the potential to promote the development of more sustainable and efficient EGS operations for stakeholders.

关键词： Coupled THM model Non-Darcy flow Deformable DFN Enhanced geothermal systems

Peripheral Mechanism of Cancer-Induced Bone Pain

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Neuroscience Bulletin 2024年第6期40卷 815-830页

作者： yachen Yang Wei Yang Ruofan Zhang Yanqing Wang Department of Integrative Medicine and Neurobiology School of Basic Medical SciencesShanghai Medical CollegeInstitute of Acupuncture ResearchInstitutes of Integrative MedicineFudan UniversityShanghai200032China Shanghai Key Laboratory of Acupuncture Mechanism and Acupoint Function Shanghai Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain ScienceInstitutes of Brain ScienceFudan UniversityShanghai200032China Zhongshan-Fudan Joint Innovation Center Zhongshan528437China

Cancer-induced bone pain(CIBP)is a type of ongoing or breakthrough pain caused by a primary bone tumor or bone *** constitutes a specific pain state with distinct characteristics;however,it shares similarities with inflammatory and neuropathic *** present,although various therapies have been developed for this condition,complete relief from CIBP in patients with cancer is yet to be ***,it is urgent to study the mechanism underlying CIBP to develop efficient analgesic ***,we focused on the peripheral mechanism associated with the initiation of CIBP,which involves tissue injury in the bone and changes in the tumor microenvironment(TME)and dorsal root *** nerve–cancer and cancer–immunocyte cross-talk in the TME creates circumstances that promote tumor growth and metastasis,ultimately leading to *** peripheral mechanism of CIBP and current treatments as well as potential therapeutic targets are discussed in this review.

关键词： Cancer-induced bone pain Peripheral mechanism Tumor microenvironment Sensory nerve Immunocytes

A multi-functional MgF_(2)/polydopamine/hyaluronan-astaxanthin coating on the biodegradable ZE21B alloy with better corrosion resistance and biocompatibility for cardiovascular application

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Journal of Magnesium and Alloys 2024年第3期12卷 1102-1116页

作者： yachen Hou Xueqi Zhang Jingan Li Liguo Wang Shaokang Guan School of Materials Science and Engineering and Henan Key Laboratory of Advanced Magnesium Alloy and Key Laboratory of Materials Processing and Mold Technology(Ministry of Education) Zhengzhou UniversityZhengzhou 450001China

The cardiovascular diseases(CVD)continue to be the major threat to global public health over the years,while one of the effective methods to treat CVD is stent *** magnesium(Mg)alloys have great potential applications in cardiovascular stents benefit from their excellent biodegradability and ***,excessive degradation rate and the delayed surface endothelialization still limit their further *** this study,we modified a Mg-Zn-Y-Nd alloy(ZE21B)by preparing MgF_(2) as the corrosion resistance layer,the dopamine polymer film(PDA)as the bonding layer,and hyaluronic acid(HA)loaded astaxanthin(ASTA)as an important layer to directing the cardiovascular cells *** electrochemical test results showed that the MgF_(2)/PDA/HA-ASTA coating improved the corrosion resistance of *** cytocompatibility experiments also demonstrated that this novel composite coating also selectively promoted endothelial cells proliferation,inhibited hyperproliferation of smooth muscle cells and adhesion of *** with the HAloaded rapamycin(RAPA)coating,our MgF_(2)/PDA/HA-ASTA coating showed better blood compatibility and cytocompatibility,indicating stronger multi-functions for the ZE21B alloy on cardiovascular application.

关键词： Biodegradable ZE21B alloy Reendothelialization Surface modification Hyaluronic acid Astaxanthin.

Heralded entanglement between error-protected logical qubits for fault-tolerant distributed quantum computing

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 25-33页

作者： Jialun Li Zhihao Xie yachen Li Yansen Liang Zhenhua Li Tao Li MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing School of PhysicsNanjing University of Science and TechnologyNanjing 210094China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China

Quantum error correction is essential for achieving reliable quantum information processing tasks,as it can mitigate the detrimental effects of noise by encoding single-qubit information into a larger quantum ***,the generation of distributed entanglement between logical qubits located within two spatially separated nodes presents a significant resource-intensive challenge that has yet to be *** we present a heralded protocol for generating distributed entanglement between two nonlocal error-protected logical qubits.A high-dimensional single photon can evolve physical qubits into a logical qubit that entangles with the photon and then converts logical qubit-photon entanglement into entanglement between two logical qubits,when the photon state is properly tuned and an effective photon-spin interface between single photons and individual spins is ***,the success of the entanglement generation is heralded by the detection of the photon,and the corresponding efficiency can,in principle,approach *** distinguished features make our protocol highly appealing for future large-scale quantum technologies.

关键词： quantum networks distributed entanglement error-protected logical qubits high-dimensional photons