跨铁路50mT梁架设关键技术研究

文章针对跨铁路线50mT梁架设中面临的梁体易失稳、施工空间受限等难题,结合广东黄岐互通式立交桥施工实践,介绍了采用具良好经济效益的无前牵引鼻梁和无后平衡压重短导梁架桥机的新颖架梁方法,详细讨论了T梁运输、架设操作步骤、施工设备、临时支墩设置及双片横移等关键技术,对复杂施工条件下同类型桥梁构件的安装施工具有参考价值。     

Individual Investors' Sentiment and Temporary Stock Price Pressure

Using data for the Hong Kong stock market, where individual investors' sentiment is likely to be influential, this study finds that the publication of individual investors' sentiment temporarily affects stock prices regardless of the publication's incompetence in predicting stock returns. Specifically, when the publication reports that more and more investors are optimistic, the return on the day just after the publication is higher and the return several days later is lower. Furthermore, the results are strongest for small stocks, and weakest for large stocks. It seems that some individual investors buy (sell) stocks when others, as reported by the publication, are optimistic (pessimistic), and that the trading causes temporary buying (selling) pressure initially and price reversals afterwards.     

零基流通及其生产成本补偿判定研究——以棉花生产为例

从零基流通和棉花生产者的抽象分析出发,系统地探究了棉花零基流通所必需的物质基础即连续不断地提高棉花产量,并从棉花生产成本、市场价格等要素角度分析了零基流通所需物质基础的保障措施,提出了如果实行棉花零基流通,对植棉成本实行财政全额补偿,采取正确的棉花收储政策对流通领域进行合理干预,那么,我国棉花种植产业不但能获得新生,而且能够迅速崛起为世界范围强大的棉花产业。从经济原理而言,实行棉花零基流通,不仅使棉花资源得到最佳配置,农业现代化也将在棉花流通领域迈入日渐完善之路。     

Temporariness made interminable: Pacific Islander farmworkers in Australia and the enduring crises of global agricultural production

Drawing on long-term ethnographic fieldwork with Seasonal Worker Programme (SWP) workers in south-east Australia, I reflect in this paper on the experience of interminable temporariness and on its implications for the structural conditions underpinning contemporary horticultural labour in Australia. Although in many ways reflective of the specificities of a unique historical moment, the interminable temporariness experienced through the COVID-19 pandemic also speaks to broader, enduring conditions produced within contemporary Australian agriculture. Here, the restructuring of the agri-industry produces for many what Lauren Berlant describes as the “impasse” or “crisis ordinariness” of life under neoliberalism. At the same time, logics of development—including racialized imaginaries and border regimes—articulate with agricultural guest worker schemes in ways that seek to fix whole populations and regions in relations of suspended hope. In this context, I argue, the pandemic exposed and intensified structural vulnerabilities and unequal distributions of risk, which are encoded in the political economy of farm work in Australia, while also cleaving open new, if tentative, possibilities for agency and solidarity.     

Leadership in Temporary Organizations: A Review of Leadership Theories and a Research Agenda

Projects and other temporary forms of organizing are different from standard organizational processes. As most leadership theories are based on the assumption of stable organizational environments, the increase in temporary forms of organizing poses specific challenges to leadership theories. We evaluate existing leadership theories in terms of their applicability on temporary environments and identify theories, which are adaptable to temporary settings and therefore may be the basis for empirical investigations in this field. On this basis we derive a research agenda by proposing individual leadership theories and combinations of different leadership approaches to be further assessed in research.     

钻石型桥塔临时撑、拉杆的设计

厦漳跨海大桥索塔采用钻石形桥塔,塔高227 m,包括上、中、下塔柱和下横梁。施工时,为避免倾斜塔肢在悬臂状态下,塔壁因拉应力超标而产生裂纹,下塔柱设置二道对拉,中塔柱设置五道对撑,确保塔柱施工线型及塔身质量满足施工控制要求。     

The labour market effects of financial crises

This paper examines how the 2008–2009 financial crisis affected labour markets in Europe, and how this impact depended on employment protection laws. Using a difference‐in‐differences approach, our estimates isolate the effect of the lack of credit on the labour market from that of the general decline in aggregate economic activity. We find large and negative impacts of the credit shock on total employment, particularly on temporary, unskilled and young workers. These impacts were significantly larger in countries with stronger legal protection of permanent workers from dismissal. This suggests that the differential impact of the crisis across countries was not entirely driven by the heterogeneity of the credit shock, but also by labour regulations. Given regulatory inflexibility in adjusting the permanent workforce, firms responded to tightening financial constraints by disproportionately laying off temporary workers (who tend to be younger and less skilled than permanent workers).     

Trade Destruction and Trade Diversion: Evidence from China

Over the past three decades, we have seen a dramatic increase in the incidence of temporary trade barriers such as antidumping duties and countervailing duties. China has been at the receiving end of a large number of such measures. In this paper, we study how China's exports to its major trade partners have been affected when its major trade partners have used these measures either against China or against other countries. We find that Chinese exports to the country that imposed an antidumping duty decreased by approximately 35 percent. At the same time, an antidumping duty used by the importing country that was directed towards other countries but not against China led to an approximate 30‐percent increase in China's exports to the policy‐imposing country. These results remain robust across various specifications. Our findings have important policy implications. In particular, the magnitude of these effects highlights why it is important to curb the recent widespread use of these barriers.     

低碳光电模块化板房的降温减碳实效——以广州地区为例

近年来,建筑的建造与运行占我国全社会能耗的比例高达32%,转变建造方式与深化运行节能已成为建筑业节能的重点。为研究低碳光电模块化板房的降温减碳效果,在广州市天河区搭建3个测试房间进行降温减碳对比实测,将低碳模块化BAPV(建筑附着光伏)板房、BIPV(光伏建筑一体化)板房与普通板房的屋顶内表面温度、外墙内表面温度、室内空气温度及空调耗电量等进行对比分析。测试结果表明：对于广州地区,在自然通风工况下,低碳模块化BAPV板房与BIPV板房相比普通板房能明显降低房间内表面温度和空气温度,改善室内热舒适环境;在空调工况下,低碳模块化BAPV板房与BIPV板房相比普通板房能有效降低空调耗电量,节能减碳率可达18.7%,减碳效果显著。     

预收保费与保险责任的承担——论我国应当建立暂保承诺制度

如何规范从投保人提出投保申请到保险人承诺前这段时间的"保险真空",解决该问题的最佳选择就是借鉴国外的暂保承诺制度,在保险人决定是否对要保人的要约作出承诺前,为其提供暂时的保险保护.