“西为中用·顺势利导”——生态雨水机埠 与合流制特点的老旧城区海绵改造

以常德市柏子园汇水片区为例，运用水力模型工 具，探讨在老城区现有末端生态雨水机埠情形下，通过优化设 置低影响开发(LID)设施和管网改造工程，从源头解决机埠合 流制溢流(CSO)污染的效果和可行性。根据棚户区较多、绿 地率少、土壤渗透性差、项目实施难度大等情况，进行项目方 案布置和LID措施选择；根据现状管网特征，进行近远期管网 改造方案和源头截流措施选择。采用典型年降雨数据进行连续 模拟，分析评估在老旧城区增设源头控制设施和中途管网改造 对既定末端机埠溢流水量及溢流频次的控制效果，并通过情景 方案比选，得出在现有土地使用条件下的最优海绵改造方案， 以期为类似合流制特点的区域提供参考和借鉴。     

Understanding on-the-go consumption: A retail mix perspective

On-the-go (OTG) consumption is a growing phenomenon in the food and beverage industry. Drawing on the theory of consumption values, this study is conducted to acquire a better understanding of the influence that retail-mix elements have on OTG consumption outcomes. Specifically, this study examines the role of value for money, customer service, general assortments and healthy assortments in driving intention and satisfaction related to OTG consumption. The study also assesses the conditional value generated by the consumer's health orientation, impulsiveness and perceived time pressure. Based on a sample of 433 OTG consumers, and applying multi-group structural equation modelling (SEM) and fuzzy-set qualitative comparative analysis (fsQCA), value for money was identified as the key driver of OTG consumption outcomes. Impulsiveness and time pressure are shown to increase the effects of value for money perceptions on OTG consumption intention, while health orientation enhances the relationship between customer service and satisfaction. This study contributes to the literature on OTG consumption, explains the managerial implications for retailers, and offers recommendations to target OTG consumers better.     

FX Intervention in the New Keynesian Model

We develop an open-economy New Keynesian Model with foreign exchange (FX) intervention in the presence of a financial accelerator and shocks to risk appetite in international capital markets. We obtain closed-form solutions for optimal monetary and FX intervention policies assuming the central bank cannot commit to future policies, and we compare the solution to that under policy commitment. We show how FX intervention can help reduce the volatility of the exchange rate, of inflation, and of the output gap, thus mitigating welfare losses associated with shocks in the international capital markets. We also show that, when the financial accelerator is strong, there is a risk of indeterminacy (self-fulfilling currency and inflation movements) although FX intervention can reduce this risk and thus reinforce the credibility of the inflation targeting regime. Model simulations match well the impact of a VIX shock obtained by local projections on a panel of inflation targeting emerging markets.     

大体积混凝土主墩承台一次性浇筑施工工艺

大体积整体浇筑混凝土工艺,可明显缩短工期。工艺控制重点是通过混凝土配合比设计、外加剂的选择、冷却管布设、温差控制和混凝土浇筑养护等方面,消除混凝土温差应力、收缩等原因形成的裂缝,使得混凝土结构整体性好,安全可靠。     

Organisational regulatory legitimacy,entrepreneurial orientation,and SME innovation: an optimal distinctiveness perspective

The optimal distinctiveness perspective argues that firms face competing pressures to be both ‘like’ and ‘different from’ their peers. On the one hand, institutional scholars assert that firms need to be similar to peers in order to gain legitimacy. On the other hand, strategy scholars insist that firms need to strive to be different to gain competitive advantage. In order to enrich the optimal distinctiveness perspective, the present study builds a conceptual model that addresses the relationships among organisational regulatory legitimacy, entrepreneurial orientation, and SME innovation under the context of China’s transition economy. Our empirical results show that organisational regulatory legitimacy has an inverted-U relationship with SME innovation. Further, entrepreneurial orientation strengthens this inverse-U shaped relationship. That is, entrepreneurial orientation magnifies both the positive and the negative effect of organisational regulatory legitimacy on SME innovation. This study echoes to the call to conduct broader optimal distinctiveness research by integrating institutional theory and strategic management. Furthermore, our findings provide new evidence for the strategic balance perspective of optimal distinctiveness.     

Wildlife viewing: The impact of money-back guarantees

Wildlife sightings are not always guaranteed. To address this risk, tour operators often offer a money-back guarantee as a refund mechanism. However, studies have overlooked the influences of such refund mechanisms on tourists' tour participation decisions and tourism revenue. We conducted choice experiments to examine the impact of such mechanisms using a case of Amami rabbit tourism in Japan. We found that the guarantee significantly influences the tourists’ decision-making and tour revenue. In particular, we found that the expected tourist participation rate and tour guide revenue vary drastically depending on the probability of the rabbit encounter. The maximum expected revenue from the tour with a 90% chance was about 20 times larger than that with a 10% chance. This indicates that conserving wildlife to maintain the sighting probability raises tour benefits, creating a win-win situation by balancing conservation and tourism development.     

互通立交跨线箱梁支架设计及验算

本文对高速公路互通立交跨线桥的现浇箱梁支架设计方案及验算进行了阐述,主要包括支架布置、支架计算、结果分析等。利用大型有限元分析软件Midas Civil建立模型,对支架的受力、变形及稳定性进行了分析验算,为施工提供了可行依据。     

PLC液压控制系统在桥梁整体同步顶升中的应用

新建桥梁与原有旧桥梁的对接如何进行,尤其是对刚投入使用不久的桥梁改造,应从经济、环保、交通、使用价值安全等多方面考虑。桥梁整体可靠程度将直接影响桥梁结构的安全度和耐久性,PLC液压控制系统能够有效解决桥梁上部结构在顶升、降落过程中同步位移的难题,保证桥梁的整体性。     

变频器内建PLC在上料机改造中的应用

结合青海百通公司的高炉情况,设计出了上料机改造方案。介绍了台达变频器在高炉卷扬调速系统中的应用情况,给出了电气原理图、注意事项和常见故障处理。实际应用的良好效果验证了该系统的稳定性和可靠性。     

Nowcasting South African gross domestic product using a suite of statistical models

Given lags in the release of data, a central bank must ‘nowcast’ current gross domestic product (GDP) using available quarterly or higher frequency data to understand the current state of economic activity. This paper uses various statistical modelling techniques to draw on a large number of series to nowcast South African GDP. We also show that GDP volatility has increased markedly over the last 5 years, making GDP forecasting more difficult. We show that all the models developed, as well as the Reserve Bank's official forecasts, have tended to overestimate GDP growth over this period. However, several of the statistical nowcasting models we present in this paper provide competitive nowcasts relative to the official Reserve Bank and market analysts' nowcasts.