大国战略竞争与美国对华技术政策变迁

世界政治领导国的对外技术政策很大程度上源于应对大国战略竞争的需要。当美国面临直接、迫切的大国战略竞争压力时,更愿意通过放宽技术进口和出口限制来争取合作者、应对竞争者,即"利用强者打败更强者"。自20世纪70年代以来,美国对华技术政策经历了从逐步放松再到加强限制这一过程。苏联的安全竞争压力迫使美国在加强对苏技术出口限制的同时,放宽对华技术出口限制。日本的经济竞争压力促使美国在加强对日技术进口限制的同时,放宽对华技术进口限制。应对直接、迫切的大国战略竞争压力,会促使世界政治的领导国更重视当期利益,同时也为潜在竞争者的成长提供机会。而当苏联和日本对美国构成的大国战略竞争压力逐渐褪去时,美国对华技术政策再度面临调整压力,以致于今为甚,通过发起对华贸易战,打压中国高新技术产业,全面收紧了对华高技术进出口限制。美国的技术竞争将是今后很长时间中国技术进步难以绕过的阻碍。     

Human Services Providers’ Perspectives on Refugee Resettlement in the United States before and after the 2016 Presidential Election

Abstract

The United States has historically accepted and resettled refugees by opening its doors to those fleeing violence, armed conflict, or persecution around the world. However, the degree of receptivity toward refugee resettlement has vacillated over time. This study examines the challenges and opportunities that Refugee Resettlement Agencies (RRAs) experienced prior to and after the 2016?U.S. Presidential election. The findings presented in this paper, based on focus groups with the RRA staff, revealed that there is a greater need for understanding the refugee resettlement process and how changing immigration policies impact state-federal funding.     

黄芪-丹参对动脉粥样硬化大鼠肠道菌群的影响

目的 研究黄芪-丹参对动脉粥样硬化（atherosclerosis，AS）大鼠肠道菌群的影响。方法 将大鼠随机分为空白组、模型组、辛伐他汀组（1 mg/kg）、黄芪-丹参组（0.75 g/kg），采用高脂饲料喂养联合腹腔注射维生素D3 8周的方法复制AS模型，同时灌胃给药。采用自动生化分析仪检测大鼠血清总胆固醇（total cholesterol, TC）、三酰甘油（Triacylglycerol, TG）、低密度脂蛋白胆固醇（low-density lipoprotein cholesterol, LDL-C）水平，采用酶联免疫吸附试验检测血清肿瘤坏死因子-α（tumor necrosis factor-α,TNF-α）、白细胞介素-6（interleukin-6,IL-6）、白细胞介素-1β（interleukin-1β，IL-1β）水平，光学显微镜下观察胸主动脉病理变化，采用生物信息分析方法观察大鼠结肠内容物肠道菌群变化。结果 与空白组比较，模型组大鼠血清TC、TG、LDL-C、TNF-α、IL-6、IL-1β水平明显升高（P<0.05），HDL-C水平明显降低（P<0.05），胸主动脉血管内皮损伤严重，可见明显蓝色钙状斑块，结肠内容物肠道菌群Berger-Parker、Simpson指数明显降低（P<0.05），放线菌门（Actinobacteria）、乳杆菌属（Lactobacillus）、双歧杆菌属（Bifidobacterium）和杜氏杆菌属（Dubosiella）群落丰度明显降低（P<0.05），变形菌门（Proteobacteria）、疣微菌门（Verrucomicrobia）以及布劳特氏菌属（Blautia）、unclassified_f_Ruminococcaceae和Lachnospiraceae_NK4A136_group群落丰度明显升高（P<0.05）。与模型组比较，黄芪-丹参组大鼠血清血脂和炎症因子水平明显改善（P<0.05），胸主动脉血管内皮无明显损伤及增厚，大致恢复正常，结肠内容物肠道菌群Berger-Parker、Simpson指数明显升高（P<0.05），放线菌门、乳杆菌属、双歧杆菌属和杜氏杆菌属群落丰度明显升高（P<0.05），变形菌门、疣微菌门以及布劳特氏菌属、unclassified_f_Ruminococcaceae和Lachnospiraceae_NK4A136_group群落丰度明显降低（P<0.05）。〖JP〗结论 黄芪-丹参治疗AS的作用机制可能是通过调控肠道菌群改善血脂代谢和抑制炎症水平实现的。     

VNTR D17530位点多态性在亲子鉴定中的应用

运用微量热启动PCR技术,对20例正常家系的遗传学分析,证实D17530位点的遗传符合孟德尔遗传规律,表现为简单的共显性遗传。同时,对100例亲子鉴定案例进行回顾性分析研究,证明D17S30位．在多态性可应用于我国法医学亲子鉴定。根据D17S30位点基因频率估算的排除概率（74．04％）与其实际排除能力（80．00％）无显著差异。在15倒排除亲子关系的案例中,有2例由D17S30位点单独取得排除证据。D17S30位点是法医学上有重要意义的遗传学标记,可用于亲子鉴定。     

Party competition and citizens' political attitudes in the American states

Democratic theorists argue that vigorous competition between candidates/parties is essential for democracy to flourish because it engages citizens' political interest and ultimately makes elected officials more accountable to their constituents. Using data on citizens' perceptions of government responsiveness to their political opinions from the American National Election Studies and the Ranney measure of party competition for control of state government, we examine the effects of competition on citizens' political attitudes from 1952 to 2008. Our analysis reveals that citizens feel government is more responsive to them when there is greater competition between the two parties for control of government in their state. However, this relationship is confined only to citizens who identify with the party that controls government in their state. We also find that the relationship between competition and efficacy is strongest among citizens with lower levels of education and income. These results suggest that vigorous competition for control of state government can have important implications for citizens' political attitudes.     

Untangling Housing Cost and Transportation Interactions: The Location Affordability Index Model—Version 2 (LAIM2)

Abstract

It is now accepted that to have an understanding of housing affordability one must consider not only housing costs, but also the transportation costs associated with that household location. To make this information readily accessible to the public, the United States government created an Internet resource, the Location Affordability Portal – Version 2 (www.locationaffordability.info), to provide housing and transportation costs for every neighborhood in all 50 states and the District of Columbia. Although the statistical model at the heart of this resource was designed for predictive accuracy, its design and parameter estimates can provide additional insights into the interaction of housing cost and transportation choices (and thus its cost). This study describes the development and explores the policy implications (and limitations) of this structural equations model, the Location Affordability Index Model – Version 2 (LAIM2).     

Checking the Fact-Checkers in 2008: Predicting Political Ad Scrutiny and Assessing Consistency

Which types of political ads are most likely to draw criticism from fact-checkers? Are fact-checkers consistent in their evaluations of political ads? Examining general election television ads from the 2008 U.S. presidential race, and based upon the evaluations of FactCheck.org, PolitiFact.com, and the Washington Post's Fact Checker, this study demonstrates it was the attack ads from candidates that were most likely to draw scrutiny from the fact-checkers. Most importantly, a high level of agreement between the fact-checkers indicates their success at selecting political claims that can be consistently evaluated. While political advertisers are increasingly using evidence to support their claims, what may be more critical in drawing evaluations from fact-checkers is the verifiability of a claim. The implications of consistent fact-checking on the public, political actors, journalism and democracy are discussed. With the revelation that fact-checking can be consistently practiced, localized efforts at fact-checking need encouragement, particularly as political TV ads increasingly drown out other potential sources of information for the public and increasingly are used in downballot races, local initiatives, referendums and judicial races.     

John Paul Jones: An Overlooked Autopsy Finding that May Explain His Terminal Illness

A finding in the autopsy of John Paul Jones, the American Revolutionary War naval hero, may explain his terminal illness. During his last 2 years, he had a persistent productive cough and dyspnea. Ten days before death, he developed rapidly progressive dependent edema and ascites. He died in France in 1792. His body, preserved in alcohol in a lead coffin, was, in 1905, removed to the United States. Glomerulonephritis was noted on an autopsy, performed in France, but there was no comment then or since about ventricular wall thickness being the same in both ventricles at 5–6 mm. Hypertrophy and dilatation with biventricular failure followed by tissue shrinkage during 113 years in alcohol could have resulted in these ventricular wall findings. Systemic hypertension and left ventricular failure are consistent with his respiratory symptoms complicated perhaps by pulmonary emboli, right ventricular failure with tricuspid regurgitation, peripheral congestion, and jaundice.     

网络考试系统分析

组织学生考试是高校重要的工作,但现在的考试形式大多是教师手工出题、阅卷,虽然出现了相应的答题卡形式,减少了老师一定的阅卷负担,但效率还是较低的。利用网络和数据库技术,结合目前硬件价格普遍下跌与宽带网大力建设的有利时机,基于B／S模式研究开发了试题库与在线考试系统。它运用方便、操作简单,效率较高,同时也大大减轻了教师出题、组卷和改卷等繁重的工作量。     

美国全球供应链调整的国家安全逻辑及实现路径

自奥巴马政府以来,特别是新冠肺炎疫情暴发后,国家安全在美国全球供应链调整中的影响日益彰显。在国家安全的视域下,美国政府调整全球供应链的逻辑依据为“国防论”与“选择性贸易保护主义”。美国的国家安全侧重国家利益与价值,全球供应链调整则诉求产品(或服务)的可替换性,二者交互作用,贸易保护主义性质的“国防论”与“选择性贸易保护主义”就成为分析美国全球供应链调整的理论分析框架。“国防论”侧重诠释具有国防意义产品(或服务)的进出口,而“选择性贸易保护主义”则分析了普通贸易实践对美国整体福利乃至国家安全的损害。美国在国家安全视域下调整全球供应链的路径依赖于软硬两种手段。一是无弹性的硬手段,表现为官僚体制、决策机制、相关法律制度与管理规范,美国全球供应链上的企业必须遵守,其具有吓阻功能。二是具有弹性的软手段,体现为国家战略以及政策说明等,其不具有强制性。基于此,这一研究有助于进一步厘清时下美国政府变动不居的对华经贸政策,构建合作与开放的中美经贸关系。