油气管道平滑凹陷疲劳试验应变响应分析

将含深度15%OD平滑凹陷的试验管段进行疲劳试验,并监测凹陷不同部位的应变响应,结果表明：疲劳失效位置出现凹陷边缘位置,失效方式为轴向疲劳裂纹;凹陷中心在疲劳试验过程中,环向受拉,轴向受压;凹陷轴向中间位置和45°中间位置,环向和轴向均为拉应变,而凹陷环向中间位置,环向为拉应变,轴向为压应变;凹陷轴向边缘的环向和轴向均受压,45°边缘的环向和轴向均受拉,而环向边缘在疲劳试验过程中环向受压,轴向受拉。     

维生素C二步发酵菌种自然选育的研究

采用自然选育菌种的方法 ,从维生素 C二步发酵的生产过程中选取了一些具有某些特性的样品 ,后又从中选得 5 6个菌系 ,最终筛得一混合菌系 2 0 1 -F,此菌系同正在使用的 1 5 2菌系相比较 ,摇瓶条件实验较之 72 h提早至 48h到达终点 (产酸速度快 ) ,且转化率提高 5 %左右。培养条件同 1 5 2菌系也有些差异 ,并且此菌种进行了 5代传代后 ,平板培养、种液培养、摇瓶发酵所表现的特性均可稳定遗传。     

Beyond the Work‐to‐Leisure Conflict: A High Road through Social Support for Tourism Employees

The purpose of this study was to test the direct and moderating effects of job strain variables on the Job Demand–Control–Support model. A total of 422 tourism employees completed a questionnaire. Hierarchical and moderated regression models were employed to test the proposed relationships between job strain variables and work‐to‐leisure conflict. Results indicated that job demands had a positive relationship with work‐to‐leisure conflict, whereas the schedule flexibility and the time‐off flexibility were negatively related to work‐to‐leisure conflict. Results also found that supervisor support could moderate the influence of tourism employees' job demands on work‐to‐leisure conflict. Implications of stress management and job design for human resource department are discussed. Copyright © 2013 John Wiley & Sons, Ltd.     

纤维风积沙土归一化特性分析

基于纤维风积沙土的不固结不排水三轴剪切试验,为实现应变硬化型纤维风积沙土应力—应变关系的归一化,基于应变硬化型典型的双曲线特征,提出了以固结围压作为归一化因子。通过以固结围压为归一化因子,对纤维风积沙土应力—应变特性进行归一化分析和比较表明,纤维风积沙土的应力-应变特性归一化程度更高,效果更好。同时,建立了应变硬化型纤维风积沙土应力—应变特性的归一化方程。     

废糖蜜生产衣康酸发酵条件的优化

本研究以废糖蜜作为主要原料,以土曲霉菌株Aspergillum Terrors A2为出发菌,先后采用Li Cl和UV进行诱变,使用溴甲酚绿显色平板筛选,获得了衣康酸的高产菌株Aspergillum Terrors C2,产酸率达到6.71%。以Aspergillum Terrors C2作为发酵菌株,对发酵温度、初始含糖量、p H值、4接种量等影响因素进行L9（3）4因素3水平的正交试验,获得最佳的发酵条件为：温度37℃,初糖15%,p H4,接种量3%。     

PPP test for Asian countries and regions: new evidence from a wild bootstrap AESTAR test

This article investigates the effects of time-varying variance on the asymmetric exponential smooth transition autoregressive (AESTAR) unit root test. We propose a wild bootstrap-based implementation of the test, which is asymptotically valid under time-varying variance. We apply our proposed method to test the Purchasing Power Parity (PPP) hypothesis for Asian countries and regions, and find that our proposed test provides stronger evidence against the PPP hypothesis than the conventional AESTAR test.     

论《大札撒》中的野生动物保护法律观

《大札撒》作为古代蒙古社会第一部成文法典,折射出古代蒙古人对生态环境的重视与保护,《大札撒》中有关野生动物保护的条文及其所蕴含的法律观念,至今仍对我国完善野生动物保护法规、合理保护野生动物有重要的借鉴价值和现实意义。     

Seafood Purchasing Preferences of Hawaii Chefs: Comparing Actual Purchase to Stated Preferences From Conjoint Choice Experiment

This study investigated if Hawaii chefs use wild seafood products over farm-raised and local over imports. Chefs were asked to estimate their purchases for shrimp, tuna, mahimahi, and salmon. Chefs were also asked to choose products within conjoint choice experiments to indirectly determine their preferences. Price is the most important attribute for shrimp. Hawaii chefs would prefer wild and farm-raised local, fresh shrimp if it were competitively priced over low-priced imported and frozen alternatives. This result can be useful for the shrimp aquaculture industry in Hawaii. The low importance of production method when purchasing seafood should be further explored.     

大兴安岭野生浆果资源利用状况及产业化发展对策

大兴安岭地区有30余种野生浆果,种类组成独特、单纯,质量好,储存量大,分布集中,易于采收;分析了大兴安岭地区野生浆果资源的总体情况和当前利用状况及存在的问题,提出了充分利用资源的思路和对策。     

泰山的野生观赏植物资源调查

按一般的观赏植物分类体系将泰山的观赏植物资源分为古树名末,观花乔木和灌木,野生草本花齐、秋季观叶观果植物、常绿观赏植物,藤本植物,珍稀物人七厌烦,并对合理保护,开发观赏植物资源提出了几点建议。