阿勒泰近20年物候(候鸟)观测资料统计分析

根据阿勒泰20年的物候(候鸟)观测资料，分析候鸟的迁徙变化规律，并和阿勒泰近20年的气候变化做对比分析。     

Response to orthogonal components of ground motion and assessment of percentage combination rules

The effects of horizontal components of ground motion on the linear response of torsionally stiff and torsionally flexible systems, on soft and firm soil conditions, are examined. A one‐story, two‐way asymmetric structural system is used, subjected to uncorrelated ground motion components along their principal directions. Spectral densities for ground accelerations in firm and soft soils are modeled based on recorded data from large intensity Mexican earthquakes. It is shown that for firm soils, in general, these effects are important in the case of torsionally flexible systems that are stiff under translation, or for torsionally stiff systems that are flexible in translation. The percentage combination rules usually specified in seismic design codes are assessed against the dynamic response. Such combination rules can result in overly conservative design forces or underestimated design forces, particularly for torsionally flexible structures. Given the relative magnitude of the response to each ground motion component, it was found that using different percentage values in the combination rules has no significant effect on improving the estimation of the total response. Copyright © 2003 John Wiley & Sons, Ltd.     

詹强基于“平秘论”治疗气滞血瘀型腰痛的用药规律研究

目的：总结詹强教授基于“平秘论”治疗气滞血瘀型腰痛的用药规律。方法:收集2022年12月1日至2023年5月1日詹强教授治疗气滞血瘀型腰痛的门诊病案,建立相关数据库,运用Excel、SPSS Modeler、SPSS Statistics软件进行频数统计、关联规则及聚类分析。结果：纳入241首处方,得到21味高频中药,使用频次排名前5位的药物依次为炙甘草、大枣、当归、路路通、川芎;药物四气以温、平、寒为主,五味以甘、辛、苦为主,归经以肝、脾、肾经为主;二项关联规则共得到21条,聚类分析共得9类;核心组方为当归、川芎、路路通、黄芪、杜仲、炙甘草、大枣。结论：詹强教授治疗气滞血瘀型腰痛的用药以平秘为法,气血为先,药以行气活血,兼温肾补肝,身心同养。     

基于数据挖掘及网络药理学探讨射血分数保留性心力衰竭的用药规律及作用机制

目的：探讨中医药治疗射血分数保留性心力衰竭（HFPEF）的用药规律及作用机制。方法：收集中国知网2003年1月31日至2022年12月31日期间收录的中医药治疗HFPEF的相关文献,使用中医传承辅助平台V2.50进行用药规律分析,将核心药物进行网络药理学分析。结果：数据挖掘共纳入112个有效方剂,涉及127味中药,使用频次由高到低依次为黄芪、丹参、人参等,药性以温、寒、平为主,药味多甘、苦、辛,多归心、脾、肺经,共得到17个频次≥23次的药物组合,包括9味中药,7个新方组合;核心药物包括丹参、黄芪、葶苈子、人参、桂枝等。网络药理学分析得出核心药物共108个活性成分,可能作用靶点91个,与HFPEF共有52个交集靶点,主要包括肿瘤坏死因子（TNF）、白细胞介素-6(IL-6)、细胞肿瘤抗原p53（TP53）、白细胞介素-1β（IL-1β）、表皮生长因子受体（EGFR）等。核心药物主要作用于胞外、调控细胞增殖及凋亡、通过炎症反应及抗动脉粥样硬化以延缓HFPEF进程。结论：中医药治疗HFPEF的总治则为益气养阴、化瘀行水;网络药理学分析表明核心药物通过多成分、多靶点、多通路共同治疗HFPEF。     

Flow rule effects in the Tresca model

The Tresca failure criterion is used regularly in geotechnical engineering to compute the failure loads of clay soils deforming under undrained conditions. When this criterion is used together with the finite element method a plastic flow rule must also be incorporated in the elasto-plastic soil model.

The effects of the flow rule on the performance of a non-linear analysis using an elastic perfectly plastic soil model obeying the Tresca failure criteria are discussed in this note. Application of this model in a three-dimensional analysis causes computational difficulties, due to the gradient discontinuities that exist at the corner of the Tresca yield surface. Such discontinuities can be removed from the yield (or failure) surface using different methods. Two of the most widely used methods in removing singularities from the yield surface and their overall performances in a three-dimensional finite element analysis are discussed.

The motivation for this study comes from a concern raised by Randolph and Puzrin [Randolph MF and Puzrin AM Upper bound limit analysis of circular foundations on clay under general loading. Geotechnique, (2003);53(9):785–796, [5]] about reported instances of under predictions of the collapse loads by finite element analysis [Taiebat HA and Carter JP Numerical studies of the bearing capacity of shallow foundations on cohesive soil subjected to combined loading. Geotechnique, (2000);50(4):409–418, [7]] and [Taiebat HA and Carter JP Bearing capacity of strip and circular foundations on undrained clay subjected to eccentric loads. Geotechnique, (2002);52(1):61–64, [8]], [Gourvenec S and Randolph M Effect of strength non-homogeneity on the shape of failure envelopes for combined loading of strip and circular foundations on clay, Geotechnique, (2003);53(6):575–586, [4]], when it is usually expected that finite element results should overestimate the true collapse loads. The intent of this study is to demonstrate and reiterate that although the finite element method is an extremely powerful analytical tool for solution of engineering problems, it is nevertheless subjected to approximation errors due to simplifications that are necessarily made to prevent other numerical difficulties.     

常用粮仓地坪沉降观测方法及精度分析

中央直属储备粮库是国家重要的基础设施,为确保新建粮库储粮安全,必须进行粮库新仓初始装粮压仓试验,利用仓内地坪沉降观测数据对云梯升降法、悬尺法、倒尺法的精度进行分析,得出倒尺法是仓内地坪沉降观测的最佳方法。     

主动GIS框架研究

依据主动数据库理论,针对当前GIS内部空间数据库维护和外部系统应用的情况,提出了主动数据库与GIS结合的必要性,比较了被动GIS和主动GIS的差异,讨论了空间数据库环境下的主动GIS的概念、特征,提出了研究内容和关键问题,设计了主动GIS的框架结构。     

基于支持度矩阵的Apriori改进算法

提出了一种利用支持度矩阵生成频繁项集的Apriori改进算法。通过上三角分块稀疏矩阵的行列性质和非频繁列之间的约束关系,改进的算法避免了Apriori连接步中大量非频繁候选k-项集的产生及其在剪枝步中(k-1)-子集的分解和判断。该算法能够有效地压缩搜索空间,降低Apriori连接和剪枝步骤的开销。     

三轴压缩蠕变试验下石英云母片岩各向异性蠕变特性研究

对石英云母片岩进行三轴压缩蠕变试验,研究丹巴水电站石英云母片岩的三轴蠕变特性及其各向异性特性。按轴向荷载与层理面关系加工成平行组和垂直组2组试件,开展分级加载方式进行不同围压条件下的蠕变试验。试验研究表明,石英云母片岩具有蠕变特性,包括瞬时变形、衰减蠕变、稳定蠕变和加速蠕变阶段;采用带Kachanov蠕变损伤律的蠕变模型来描述石英云母片岩的蠕变特性,并进行蠕变参数辨识,拟合结果显示此模型能很好地描述石英云母片岩的蠕变特性;根据试验结果获得2组试件的长期屈服强度、破坏形态、瞬时变形参数和稳定蠕变速率,分析表明石英云母片岩的蠕变力学特性具有明显的各向异性特性。层理面与轴向荷载垂直的试件较层理面与轴向荷载平行的试件的强度、弹性剪切模量、体积模量和黏性系数相对较大,表现出较高的抗变形和抗破坏能力;平行组以剪切破坏为主,垂直组破坏时出现侧向鼓胀现象,显示出延性破坏的特点;2组石英云母片岩试件的瞬时应变量和稳定蠕变速率都随着应力水平的提高而增大。     

Study on the influencing factors of rock-soil thermophysical parameters in shallow geothermal energy

Thermophysical parameters are the main parameters affecting the utilization efficiency of shallow geothermal energy. Based on the research and evaluation data of shallow geothermal energy in capital cities of China, this paper analyzes the differences between two testing methods and finds that data measured in in-situ thermal conductivity test is closer to the actual utilization. This paper analyzes the influencing factors of thermophysical parameters from lithology, density, moisture content and porosity: The thermal conductivity coefficient of bedrock is generally higher than Quaternary system loose bed soil; as for the coefficient of bedrock, dolomite, shale and granite are higher while gabbro, sandstone and mudstone are lower; as for the coefficient of loose bed, pebble and gravel are higher while clay and silt are lower. As the particle size of sand decreases, the thermal conductivity coefficient declines accordingly. The thermal conductivity coefficient increases linearly with growing density and decreases in logarithm with growing moisture content as well as porosity; specific heat capacity decreases in logarithm with growing density, increases in power exponent with growing moisture content and decreases linearly with growing porosity. The thermal conductivity coefficient is high when hydrodynamic condition is good and vice versa. The conclusions of this paper have guiding significance for the research, evaluation and development of shallow geothermal energy in other areas.