P（St—HEMA）／PPrO共混体系浊化的膜厚效应

用自由基溶液聚合的方法合成了苯乙烯和甲基丙烯酸β－羟乙酯共聚物（Ｐ（Ｐｔ－ＨＥＭＡ），简称ＳＨ６）将其与聚环氧丙烷（ＰＰｒＯ，简称Ｎ３３０）共混，利用液浇铸法制备共混物薄膜，通过测定不同膜厚的ＳＨ６－Ｎ３３０共混体系的浊点，研究了薄膜厚度对ＳＨ６－Ｎ３３０共混体系浊化的影响，并利用逾渗机制建立了浊点值与薄膜厚度之间的定量关系，结果表明这一理论与实验数据相符合。     

基于DEA-PNN的中国上市房地产企业效率研究

文章运用传统的数据包络分析方法(DEA)对上市房地产企业的效率进行评定,引入相应的分类指标对DEA在不变规模收益下求得的效率值进行分类,然后使用概率神经网络(PNN)和传统的多重判别分析方法(MDA)对分类效果进行模式识别,并比较了两种方法的识别精确度,研究发现:(1)PNN的预测精度要优于传统的判别分析方法;(2)通过DEA的求解结果可以得出所有上市房地产企业的标杆企业;(3)当前上市房地产企业的总体效率值偏低,有巨大的提升空间。     

High sidelobe effects on interferometric coherence for circular SAR imaging geometry

The coherence is a measure for the accuracy of the interferometric phase,and the synthetic aperture radar(SAR) interferometric coherence is affected by several sources of the decorrelation noise.For the circular SAR(CSAR) imaging geometry, the system response function is in the form of the Bessel function which brings a high sidelobe,and the high sidelobe of CSAR will be an important factor influencing the interferometric coherence. The effect of the high sidelobe on the coherence is analyzed and deduced.Based on the interferometric characteristics of the slight difference in the viewing angles and the potential pixel offset in the interferometric SAR(InSAR) images,a relation between the radar impulse response and the coherence loss function is derived. From the relational model,the coherence loss function due to the high sidelobe of CSAR is then deduced,and compared with that of the conventional SAR.It is shown that the high sidelobe of CSAR focusing signal will severely affect the baseline decorrelation and coregistration decorrelation.Simulation results confirm the theoretical analysis and quantitatively show the baseline and coregistration decorrelation degradation due to the high sidelobes of CSAR.     

Weighted joint calibration for interferometric SAR

Calibration is a processing procedure for across-track interferometric synthetic aperture radar （InSAR） to achieve an accurate three-dimensional location. A calibration technique, called weighted joint calibration, for the generation of wide-area geocoded digital elevation models （DEMs） is proposed. It cali- brates multiple InSAR scenes simultaneously, and allows reducing the number of required ground control points （GCPs） by using tie points （TPs）. This approach may ensure the continuity of three- dimensional location among adjacent scenes, which is necessary for mosaic and fusion of data coming from different scenes. In addition, it introduces weights to calibration to discriminate GCPs and TPs with different coherences and locations. This paper presents the principles and methodology of this weighted joint calibration technique and illustrates its successful application in airborne In- SAR data.     

两个亚纯函数共同的相对亏函数

本文将考虑两个亚纯函数的共同根以及讨论有关相对亏函数的一些关系。例如,     

煤炭自燃可能性判定专家系统的设计与实现

本文建立的煤炭自燃可能性判定系统是一个应用计算机对采区煤层自燃发火可能性进行判定的专家系统。依据影响煤层自燃发火的各主要因素进行主观判断,分类评分,建立专家系统知识库,对生产采区煤层自燃发火的可能性进行综合预测.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

市售食用植物油脂理化指标检测与营养分析

按照国家标准,对几种常用食用植物油脂和菜籽毛油的色度、含水量、酸价指数、过氧化值、碘价、不皂化物含量等几项被国家列为强制性标准的指标进行检测,并通过气相色谱对样品中脂肪酸组成做了测定,对常用的市售食用植物油脂的理化质量和营养价值做了全面分析.     

亚纯函数的相对亏函数

通常亏量与相对亏量有一些关系,例如,对任一正整数k,δ_r~(k)(∞,f)≤3/2-1/2{δ(0,f)+δ(α,f)}其中α≠0,∞为一复数,现将复数α换成亏函数α(Z),不等式仍成立     

变形镁合金的研究热点概述

铸造工艺是镁合金件制造的主流,但经过塑性加工成形的镁合金产品具有更好的力学性能,可适应更为多变的工况需求。国际镁业协会认为,镁合金的长期发展目标应放在新变形镁合金与新成形工艺的开发与研究上。该文概述了变形镁合金目前在世界上的研究热点,分析了中国研究者的变形镁合金研究特点并建议在提高镁合金板材常温下的塑性成形性能方面多做工作,以增强中国镁合金深加工的技术能力。