沧州南部典型区近30年来气温演变特征分析

文中主要分析了沧州南部典型区近30年来气温演变情势,分析了其统计特征、年内变化趋势性和年代际变化、持续性、突变性和周期性,得出了一定的规律性,为深入研究本区域与气温有关的课题打下了基础。     

一种新的比相式电抗型距离继电器算法

对测量阻抗型和相量比较型两种类型的电抗距离继电器的抗稳态超越的能力进行了研究,主要包括负荷的影响和同相问题的研究。同时,构造了一个新的电抗型距离继电器判据和算法,该算法具有方向性,且不受负荷和同相问题的影响,解决了由于负荷和同相问题引起的稳态超越现象,提高了保护动作的可靠性。电磁暂态仿真结果证明该原理具有防止负荷和同相问题引起的稳态超越和保护范围不足的问题。     

辐射诱导冷却肉脂肪氧化机理与抑制方法研究

探讨了辐照剂量、贮藏效应、氧气含量和抗氧化剂等因素对辐照冷却肉脂肪氧化的影响，提出了抑制辐照冷却肉脂肪氧化的技术方法。结果表明，辐照冷却肉的过氧化值与辐照剂量存在极显著的正相关关系（p〈0．01），随着贮藏时间的延长表现为先升后降；在包装实验中，真空包装和无氧包装（N2＋CO2）可以咀显降低贮藏期间辐照冷却肉的过氧化值和TBARS值（硫代巴比妥酸反应物）；添加抗氧化剂后，辐照冷却肉的脂肪氧化明显降低，其过氧化值和TBARS值在贮藏期间不超过3meq／kg和0．4mgMDA／kg，而对照达到29meq／kg和1．13mgMDA／kg，其中抗氧化剂茶多酚和维生素E起主导作用。     

Liquid metal corrosion of 316L,Fe<Subscript>3</Subscript>Al,and FeCrSi in molten Zn-Al baths

Corrosion tests of 316L and two intermetallic compounds Fe₃Al and FeCrSi in industrial Galvanizing (Zn-0.18Al), GALFAN (Zn-5Al), GALVALUME (Zn-55Al), and Aluminizing (Al-8Si) baths and lab-scale static baths were conducted. In on-line tests in industrial hot-dip baths, 316L steel shows better corrosion resistance than Fe₃Al in Galvanizing, GALFAN, and GALVALUME baths. The corrosion resistance of 316L and Fe₃Al is similar in Aluminizing bath. In static tests, FeCrSi shows the best corrosion resistance in pure Zn, Zn-55Al, and Al-8Si baths. The corrosion resistance of 316L is better than that of Fe₃Al. In Zn-5Al bath, 316L shows no thickness loss after the test. For the same bath composition, the corrosion rates of the alloys in industrial baths are higher than those in static baths. Bath temperature and chemical composition play important roles in corrosion and intermetallic layer formation. Increasing bath temperature accelerates the corrosion process and changes the nature of intermetallic layers. A small amount of aluminum reduces the corrosion process by reducing the activity of Zn and forming inhibition layer. However, after aluminum content reaches the critical point, the dominant corrosion process changes from Zn-Fe reaction to Al-Fe reaction, and, consequently, the corrosion process accelerates by increasing aluminum content in the bath.     

输电线路边界保护中雷电冲击与故障的识别

输电线路的边界保护原理是在单端利用暂态分量中包含的高频分量是否经过线路边界这一特点构成的 ,当雷电冲击线路时 ,会使边界保护发生误动作。通过大量的仿真分析 ,发现在雷电冲击没有造成短路和造成弧光短路以及普通短路故障情况下 ,由于线路两端的避雷器造成暂态分量的小波谱随着时间的变化规律不同 ,并提取这一差别构成了雷电和短路的识别算法。输电系统的仿真模型采用频率相关模型 ,ZnO避雷器采用IEEE公认的频率相关模型。EMTP仿真验证说明了该算法的正确性。     

分子自组装体系的影响因素及其在纳米材料中的应用

介绍了分子自组装体系的影响因素以及分子自组装技术在纳米材料制备方面的应用,并对聚合物自组装体系及研究进展作了综述.     

'It's the end of the world as we know it': Threat and the spatial-symbolic self": Correction to Burris and Rempel (2004).

Reports an error in 'It's the End of the World as We Know It': Threat and the Spatial-Symbolic Self" by Christopher T. Burris and John K. Rempel (Journal of Personality and Social Psychology, 2004[Jan], Vol 86[1], 19-42). The article contained two errors. On page 35, second column, line 14, two of the word fragments are notated incorrectly. The word shown as s[k]ull should be sk[u]ll, and the word shown as as[h]es should be as[h]e[s]. (The following abstract of the original article appeared in record 2003-11198-002.) According to amoebic self theory, the boundary defining the self encompasses 3 levels of self-representation--bodily, social, and spatial-symbolic. Study 1 related a newly developed measure of individual differences in sensitivity to boundary threat across these 3 domains to values and disgust sensitivity. Four subsequent studies focused on spatial-symbolic threat sensitivity and related it to right-wing authoritarianism, aversive reactions to unfamiliar out-groups, and revulsion to vermin. A final experiment illustrates how a salient spatial-symbolic threat (dust mites) can elicit reactions toward out-groups that closely parallel mortality salience effects observed in research inspired by terror management theory, even though dust mites do not elicit mortality concerns. The importance of preserving the familiar in order to preserve the self is discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Wear resistant solid lubricant coating made from PTFE and epoxy

A composite coating of polytetrafluoroethylene and epoxy shows 100 × improvements in wear resistance as compared to either of its constituents alone and reduced friction coefficient under testing on a pin-on-disk tribometer. This coating is made by impregnating an expanded PTFE film with epoxy, which provides three unique functions: (1) the epoxy compartmentalizes the PTFE nodes, which is believed to reduce the wear of the PTFE, (2) the epoxy increases the mechanical properties such as elastic modulus and hardness, and (3) the epoxy provides a ready interface to bond the films onto a wide variety of substrates easily and securely. The experimental matrix had normal loads of 1–3 N, sliding speeds from 0.25 to 2.5 m/s, and used a 2.4 mm radius low carbon steel pin in a rotating pin-on-disk tribometer. The skived PTFE films had wear rates on the order of K=10^–3 mm³/Nm and friction coefficients around =0.2. Both the high density films (70 wt%PTFE) and low density films (50 wt% PTFE) had wear rates on the order of K=10^–6 mm³/Nm and friction coefficients around =0.15. The neat epoxy films showed significant scatter in the tribological measurements with wear-rates on the order of K=10^–4 mm³/Nm and friction coefficients around =0.40. The enhanced tribological behavior of these composites is believed to stem from the coatings ability to draw thin PTFE transfer films into the contact from the nodes of PTFE, which act like reservoirs. Nanoindentation mapping of the coatings and the transfer films supports this hypothesis, and accompanies scanning electron microscopy observations of the worn and unworn coatings.     

新疆东天山灵北地区康南岩体岩石学#br# 特征及其构造意义

研究区位于新疆东天山觉罗塔格造山带吐哈盆地以南百灵山以北,多年来对于研究区古生代构造背景的认识受前人热议,存在争议。通过对研究区新发现基性岩体的岩石、地球化学特征与构造背景进行探讨,以期为大区域构造背景的研究提供一定的数据支持。主量元素研究表明,康南岩体具有高Mg、Fe,低Al的特征,说明研究区基性侵入岩为碱性岩石系列。微量元素测试结果表明具有同源演化的特征,Rb、Hf元素亏损较为严重。K、Ba、P、Sm富集明显,Tb、Nb、Ti表现为弱异常,在稀土元素球粒陨石标准化配分模式图中Eu的负异常不明显,表现为弱的正异常, Yb+Nb-Rb构造环境判别图解中样品落在“后碰撞”环境内,以上特征说明具有岛弧花岗岩的基本特征。岩性为深灰绿色弱蚀变细粒橄榄辉绿岩。