咸阳龚西战国秦墓出土铜壶制作工艺研究

咸阳龚西战国秦墓出土的青铜器为研究战国时期秦青铜容器的铸造技术提供了重要实物资料。本文对龚西战国晚期秦墓M8出土的两件铜壶,通过表面观察结合X光摄像考察其制作工艺痕迹,利用金相显微镜、扫描电镜能谱分析等手段开展成分及显微结构分析,揭示两件铜壶壶身及表面装饰的制作工艺、材质特征。结果显示,两件铜壶均为铸造,器底和铜环预先铸好后置于范中,与器身铸为一体。器身和器底均为铅锡青铜(铜锡铅三元合金),但成分有一定差异,镶嵌的装饰金属片为高铅青铜。铜壶的器底分铸工艺和高铅青铜镶嵌工艺为古代青铜器制作工艺研究提供了重要的新材料。     

党的第三个历史决议的正确党史观和理论品质

中国共产党矢志践行初心使命,在百年奋斗中不断推进马克思主义中国化,团结带领人民艰辛探索、不懈奋斗,以伟大自我革命引领伟大社会革命,在奋斗中发展壮大、在奋斗中赢得胜利,书写了中国人民、中华民族发展史上最恢宏、最壮丽的奋斗史诗。一切伟大成就都是接续奋斗的结果,一切伟大事业都需要在继往开来中推进。     

Numerical Simulation and Seismic Fragility Analysis of a Self-Centering Steel MRF with Web Friction Devices

This article presents the seismic fragility analysis of a self-centering steel moment-resisting frame (SC-MRF) with web friction devices. A detailed numerical model of the SC frame was developed using the Open System for Earthquake Engineering Simulation (OpenSees) and the elastoplastic responses of the SC-MRF were studied, including the strength degradation under cyclic loading, tendon rupture, beam buckling, bolt bearing and friction loss, etc. The proposed simulation approach is validated by comparing the simulated results with those in existing hybrid-simulation tests, quasi-static pushover test and low cyclic tests, where good agreement is observed. In addition to the well-established performance limit states (i.e., immediate occupancy, collapse prevention and global dynamic instability), two unique performance limit states (i.e., the recentering and repairable limit states) are defined for the SC-MRF. Finally, incremental dynamic analyses are conducted to evaluate the seismic fragilities regarding the five performance limit states.     

How police agency diversity,policies, and outcomes shape citizen trust and willingness to engage

While widespread agreement that policing in the United States needs to be reformed arose in the summer of 2020, little consensus about specific reforms was reached. A common theme that arose, however, is a general lack of trust in the police. One response has been to increase agency diversity in terms of both officer race and officer gender. However, important questions exist about when – and what type(s) of – diversity shape citizen trust in and willingness to cooperate with the police – especially when considered in conjunction with agency performance and policies. To answer these questions, we use two conjoint experiments to evaluate whether citizens consider diversity when evaluating police agencies. We find that while both racial and gender diversity can influence public evaluations sometimes, these effects tend to emerge in the context of only the most (least) diverse institutions and are muted compared to the effects of agency policies and performance.     

帛书《老子》异文商榷

自帛书《老子》甲、乙本问世以来,学界即予以极大的关注.将帛书《老子》两种本子同传世诸种《老子》版本对勘,无论在字句还是篇章结构上都存在着显著的不同.     

New Estimates of Gravitational Attraction by Linear Programming

This paper uses data for intercity air-passenger travel to derive a set of general propulsion and attraction factors for twenty-five large U.S. cities. The paper develops a new way of examining the linkages between flows and nodal attraction. The technique is to assume that the flow data fit a simple gravity model, and then linear programming is used to maximize the consistency of the endogenous propulsion and attraction with the flow data. Various linear models are used to determine the pattern of urban attraction factors that are consistent with the gravitational flows. Linear programming as well as goal programming models are used to develop a set of analyses linking flows to urban hierarchies. Suggestions for further extensions of the method to address substantive issues of urban systems analysis are also provided.     

明代应天巡抚辖区考辨——兼论“飞地”承天府的归属

明代的应天巡抚,直接渊源自洪熙元年设于南直、浙江二省的巡抚。至宣德五年初设时,其辖区应为南直隶应天等十一府州,而非以往学界认为的仅辖苏州、松江、常州三府。正统间,因浙江巡抚的废置,加之出于综合督理太湖流域税粮、水利事务的需要,其辖区遂长期扩展至浙西杭州、嘉兴、湖州三府,统十四府州之地。湖广承天府在嘉靖十四年后一直属湖广巡抚辖区,从未隶应天巡抚管辖。学界所习称的嘉靖十四年至隆庆初应天巡抚一度辖有承天府这一“飞地”的说法,并不足以凭信。这一观点的产生,源于研究者受到了现行《明世宗实录》中相关记载的误导。     

Fluid inclusion and isotopic constraints on the origin of ore‐forming fluid of the Jinman–Liancheng vein Cu deposit in the Lanping Basin,western Yunnan,China

Extensive quartz–carbonate–Cu sulfide veins occur in clastic rocks and are spatially related to Paleocene granites in the western border of the Lanping Basin, western Yunnan, China. Abundant aqueous‐carbonic fluid inclusions occur in these veins but their origin is debated. In the Jinman–Liancheng deposit, individual primary inclusion groups contain either exclusively liquid‐rich inclusions (Gl), or coexisting liquid‐rich and vapor‐rich inclusions (Glv). Microthermometry and estimate of CO₂ content indicate that type Gl inclusions either have homogenization temperatures (Th) 238–263°C and contain c. 3.9–5.5 mole % CO₂, or have Th 178–222°C and contain c. 1.6–3.2 mole % CO₂. Type Glv inclusions are thought to represent samples of fluid unmixing that occurred at 183–218°C. At that time, the liquid phase in the unmixing fluid may contain c. 2.0–3.3 mole % CO₂. As such, the correlation of CO₂ content with Th for type Gl inclusions is thought to be caused by fluid unmixing with decreasing temperature and subsequent CO₂ escape. δ¹⁸O and δD values of the parent water mainly fall in the field below that of primary magmatic water, indicative of fluid derivation from degassed (in open system) magmatic water, with no contributions from basinal or meteoric water. Initial Sr isotopic compositions of hydrothermal carbonates suggest that the fluid was magmatic, probably derived from the Paleogene granites. δ¹³C_PDB values (?4‰ to ?7‰) of the hydrothermal carbonates and δ³⁴S_V‐CDT values of sulfides (mainly ?11‰ to +5‰) indicate that the carbon and sulfur can be derived from (degassed) magma and/or nonmagmatic sources. The CO₂‐rich and magmatic‐water‐derived fluid at Jinman–Liancheng differs from the CO₂‐poor and basinally derived fluid in sediment‐hosted stratiform Cu (SSC) deposits, which suggests that there are no genetic linkages between the vein Cu and SSC deposits in the Lanping Basin.     

英国对台湾地区的政策特点及原因浅析(1950-1960年)

在东西方冷战的背景下,英国对台湾地区的政策受到多方面因素的影响,是一个棘手且无法回避的敏感问题。20世纪50年代,英国对台湾地区的政策呈现“政经分离”的特点:政治上保守慎重,强调与台湾当局保持距离;经济上积极主动,努力促进双方贸易的发展。英国政府之所以采取这一政策,不仅考虑到台海局势的严峻性、复杂性,也受英国重商主义传统与灵活务实外交思维的影响。英国对台湾地区的“政经分离”政策,使其在兼顾自身政治与经济利益的同时,也加剧了台海局势的复杂性。