地源热泵土壤热物性测试与分析

运用恒热流测试原理自主研发了岩土热物性测试仪,通过现场测试的方法,调整加热管的加热功率、埋管中循环水流量、埋管进出口水温随时间变化规律,利用线热源理论确定了地下岩土的热物性参数。实验表明,土壤初始温度的测量精度对于提高土壤的导热系数是至关重要的,在未扰动的土壤温度以及给定PE管材的条件下,测试时间为50小时左右时,土壤导热系数逐渐趋于稳定,收敛于3.109 W/(m.℃),整个测试过程平均导热系数为3.489W/(m.℃),该结果为地源热泵系统的准确设计提供了依据。     

一种铁路客运专线用防水涂料的研制

介绍了铁路客运专线桥梁用防水涂料的研制意义,用正交试验确定了该种新型涂料所用到的重要原料的种类及用量,研究了树脂与引发剂对固化速度的影响,树脂与单体的添加质量对涂膜断裂伸长率及位伸强度的影响,以及颜填料添加质量对涂膜性能的影响,并从施工的角度考察了温湿度对涂膜干燥性的影响。     

体育馆建筑被动式节能技术实测与分析——以广东药学院体育馆为例

体育馆建筑照明和空调能耗巨大,如何充分利用自然采光和自然通风是体育馆建筑节能的关键问题。广东药学院多功能体育馆在设计中考虑了多种被动式节能措施,如东、西向立面设置带有垂直遮阳的条形采光窗,南、北向立面设置可开启的外窗,附馆屋顶采用种植屋面等。该体育馆的实测结果表明上述被动式设计方法可以增加比赛场地自然光照度,防止眩光;提高观众区自然通风风速,改善舒适度;降低附馆屋顶内表面温度,减少热辐射。     

基于不变量的程序修复进化扩展模型*

为了有效解决程序修复进化中搜索空间过大和正常功能牺牲的问题,提出了一种基于不变量约束的扩展的程序修复进化模型（extended repair evolutionary model,EREM）,利用程序不变量约束对搜索空间进行划分和约简以降低消耗,通过使用表达程序正常功能的正测试用例学习的不变量约束（称为正不变量约束）来保证程序不牺牲正常的功能,在适应度函数的设计上考虑测试用例通过数的同时也考虑了正不变量约束的保持数,对于破坏正不变量约束的个体适应度给予一定的惩罚值。最后通过实验对模型进行了验证,结果表明了     

Preface

The vision of ''Internet as a computer'' motivates many technical trends, like pervasive computing, grid computing, service computing and recently, cloud computing, as well as some business trends, like modern service industry, digital economy and smarter planet. These evolutionary changes demand that the software systems which are running on the open and dynamic Internet have to be autonomous, context-sensitive, continuous-reactive, evolutionary, and proactive, and the software entities dispersed on distributed nodes over the Internet will be turned into self-contained, autonomous and adaptive. Thus, like the information Web, i.e. the World Wide Web, these Internet-based software entities will constitute a software Web. That gives birth a new software paradigm. A portmanteau term ''Internetware'' is used to denote the future software-web. An Internetware system will be able to perceive the changes of the open and dynamic environment, respond to the changes, and exhibit the context-aware, adaptive and trustworthy behaviors. The mission of Internetware may challenge many aspects of software technologies, from the operating platforms and the programming models to the engineering approaches. Internetware 2010, the second Asia-Pacific Symposium on Internetware, aims to provide an interactive forum where researchers and professionals from multiple disciplines and domains meet and exchange ideas to explore and address the challenges brought by Internetware. The symposium was held at Suzhou, China, during the 2-4 of Nov, 2010. Thirty three papers were submitted and each of them was reviewed by at least two members of an International Program Committee. Among them, 12 have been accepted (which means an acceptance rate of 36%) for their quality as well as for their interesting terms of discussions for the symposium attendees. This special issue contains 7 revised and substantially extended papers from the 12 based on presentations at the symposium: ......     

论金融衍生产品的风险积聚效应

从美国次贷危机出发,探讨了金融衍生产品的风险积聚功能。认为:由于金融衍生产品的价格受相关基础金融工具价格决定,具有财务杠杆效应、复杂的性质和设计的灵活性等特性,使其具有风险积聚能力;而金融自由化、管理层认识的滞后、激励机制的过度使用以及先进的交易技术是风险积聚的客观条件;建议通过严格的监管、完善的制度、合理的激励机制以及风险教育来化解金融衍生产品的风险积聚效应。     

2-巯基-5-甲氧基咪唑并[4,5-b]吡啶的合成

以2,6-二氯吡啶为原料,经过硝化、氨解、甲氧基取代、还原和环化5步反应制得泰妥拉唑重要中间体2-巯基-5-甲氧基咪唑并[4,5-b]吡啶,总收率达40.2%.通过红外光谱、核磁共振氢谱对部分中间体及最终产品的结构进行表征,证明结果正确.     

Phase field simulation of the 180°domain-switching process in PbTiO_3 single crystal under an antiparallel electric field

The process of 180°domain switching in PbTiO_3 single crystal under an antiparallel electric field was investigated by the three-dimensional phase field simulation,especially the effect of electric field on the type and duration of domain switching.It is found that the polarization reversal of domains takes place under an antiparallel electric field in PbTiO_3 single crystal.The results of the phase field simulation indicate that there is only 90°domain switching under a weak electric field.With the rise...     

两种群食饵-捕食者模型参数估计的数值微分法

给出了一种基于数值微分的两种群食饵-捕食模型参数估计的两阶段方法。该方法将参数的非线性最小二乘估计,转化为一个数值微分和一个线性最小二乘估计问题,具有计算简单快速的特点。数值算例详细分析了三种常见有限差分数值微分法及非线性最小二乘估计对参数估计精度的影响,结果表明提出的方法是可行的。     

锂离子电池用磷腈类聚合物电解质的制备与性能

采用六氯环三磷腈高温开环聚合方法制备了聚二氯磷腈,然后采用醇钠法,取代聚二氯磷腈的氯,制备了聚二（二乙二醇单甲醚）磷腈（MEEP）,探索出了较佳的合成工艺,采用FT-IR、31P-NMR、13C-NMR、质谱对其进行了结构表征和分析。结果表明,所制备的磷腈聚合物确实为MEEP。采用自制的MEEP,与三氟甲基磺酸锂（LiCF3SO3）盐进行复配,制备了锂离子电池用聚合物固体电解质,对其热稳定性、导电性进行了测试,其开始分解温度在200℃以上,室温电导率达到了1.187×10-4S/cm（25℃）,具有较佳的导电性和热稳定性,可用于锂离子电池的电解质。