1961～2013年塔城地区气候的时空变化特征

[目的]探究塔城地区气候的时空变化趋势及其与气象因子的关系.[方法]文章利用塔城地区7个气象站点1961~2013年的逐日气象资料,探究了气温、降水、日照时数、积温和潜在蒸散量的时空变化特征.[结果]1961~2013年塔城地区年平均气温、降水量和积温呈增加趋势,日照时数和潜在蒸散量呈减少趋势.1961~2013年塔城地区平均气温、降水量、日照时数、年潜在蒸散量、积温分别在1997、1967、1996、1989、1985年发生增加突变.平均气温、降水量、日照时数、积温存在明显的多尺度周期特征,即30年的大周期和15年的小周期变化.塔城地区平均气温的空间分布差异明显;大致呈现西高东低的空间分布特征;降雨量空间分布大致呈现西多东少的经线分布特征;日照时数大致呈现南短北长的维度地带性特征;潜在蒸散量存在自南向北逐渐减少的空间分布特征;积温的空间分布呈明显的自南向北逐渐减少的维度地带性特征.[结论]在全球气候变化下,较全面了解到新疆塔城地区气候变化趋势特征,对建立塔城地区气象预测与农业生产之间的预警,促进农业健康发展有很大的理论依据.     

Do terror attacks affect the dollar-pound exchange rate? A nonparametric causality-in-quantiles analysis

While much significant research has been done to study the effects of terror attacks on stock markets, less is known about the response of exchange rates to terror attacks. We suggest a non-parametric causality-in-quantiles test to study whether (relative) terror attacks affect exchange-rate returns and volatility. Using data on the dollar-pound exchange rate to illustrate the test, we show that terror attacks mainly affect the lower and upper quantiles of the conditional distribution of exchange-rate returns, while misspecified (due to nonlinearity and structural breaks) linear Granger causality test show no evidence of predictability. Terror attacks also affect almost all quantiles of the conditional distribution of exchange-rate volatility (except the extreme upper-end), with the significance of the effect being particularly strong for the lower quantiles. The importance of terror attacks is shown to hold also under an alternative measure of volatility and for an important emerging-market exchange rate as well.     

Measuring systemic risk with regime switching in tails

This paper motivates the importance of modeling nonlinearities in measuring systemic risk. I capitalize this motivation by generalizing the CoVaR approach proposed by Adrian and Brunnermeier (2016) to allow it switching between a high and a normal risk regime filtered from data.. Considering the U.S. large bank holding companies (BHCs), this paper shows that modeling regime changes in tails is capable of capturing both amplification and mean-reversion effects of an adverse shock to a bank's balance sheet on the banking system. Using the Kolmogorov–Smirnov test statistics with and without bootstrapping, I perform the significance test to identify systemically important financial institutions (SIFIs), and the stochastic dominance test to rank the identified SIFIs. The stochastic dominance test raises the concern that the CoVaR measure underestimates systemic risk contributions for SIFIs but overestimates for non-SIFIs. Finally, applying the BHCs' characteristics and housing market price to forecast the regime-switching systemic risk out-of-sample, I obtain from 4- and 8-quarter-ahead horizons a desirable countercyclical, forward-looking measure of systemic risk.     

TEM4改革前后完形填空的考点效度对比分析

2005年以来英语专业四级考试完形填空试题的考点效度比以前有所提高,但句子层次考点数量仍然偏高。教师在教学过程中应注重培养学生的语篇理解能力和逻辑分析能力,提高学生的语言综合运用能力。     

加强试验检测工作 提高公路工程质量

结合当前农村公路工程建设过程中存在的质量问题,浅谈如何加大试验检测工作力度,切实提高农村公路工程质量。     

备考江苏省计算机等级考试（二级VFP）策略

以Visual FoxPro（VFP）程序设计为例，具体分析了江苏省计算机等级考试的特点和题型，在此基础上，阐述了考生备考的复习方略，考试技巧，以期对广大考生有所帮助。     

Revisiting the labor supply effect of social security earnings test: New evidence from its elimination and reinstatement in Japan

We explore the labor supply effect of the social security earnings test in Japan on those aged 65–69 years through a combined examination of the elimination of the earnings test in 1985 and its reinstatement in 2002. We present evidence showing that the effects of changes in the earnings tests on the labor supply of the elderly are not symmetric, controlling for changes in the attributes of workers and firms. The repeal of the earnings test in 1985 did affect the earnings distribution of the elderly (especially for male), while its reinstatement in 2002 did not alter the earnings distribution.     

注水站流量计在线测试方法的探讨

对胜利油田注水流量计量现状进行了调研分析,提出了用现场注水罐作标准器,对注水流量计进行在线测试的方法,解决注水流量计量不准的问题。通过现场实验和数据分析,证明了该测试方法的可行性。     

生物工程大实验课程改革与探讨

生物工程大实验是生物工程专业的一门重要的综合性实验课程,就当前生物工程大实验教学存在的几点问题,从实验内容、实验体系、实验方法、考核方式方面对生物工程大实验进行改革与探讨。     

The effect of climate change on the fall foliage vacation in China

Fall foliage season has been a favorite time for sightseeing activity for centuries around the world. The dates of fall foliage coloration for Acer mono maxim at two stations (Beijing and Xi'an) with more than 30 years of records were collected. Time-series analysis showed a strong overall delay of the timing of the fall foliage vacation season. The trend for later fall foliage vacation season averaged 4–5 days/decade. Regression analysis revealed that the air temperature in September or October is decisive for the annual timing of the fall foliage vacation season. A warming of 1 °C led to a delayed beginning, best date and the end of fall foliage vacation of 5.3 days, 3.5 days and 3.7 days respectively. The beginning of fall foliage vacation season started to delay in the 1990s. Sudden delay in the best date of fall foliage vacation season of Beijing and Xi'an took place in the early 2000s and 1990s respectively. For the end of fall foliage vacation season, an abrupt delay occurred in the early 2000s. This has implications for tourists and the tourism industry with reference to the timing of trips and their promotion.