GaAsMESFET模型参数自动提取方法的研究

提出了一种基于ＰＳＰＩＣＥ４．０２通用电路模拟程序与优化技术相结合提取ＧａＡｓＭＥＳＦＥＴ模型参数的方法，根据实例的ＧａＡｓＭＥＳＦＥＴ小信号Ｓ参数与大信号Ｓ参数，利用约束优化技术提取模型等电路元件参数，并利用该电路模型参数设计制作１了３．７ＧＨｚ－４．２ＧＨｚ和５．２ＧＨｚ＝－５．８ＧＨｚ ＧａＡｓＭＥＳＦＥＴ放大器，给出了设计和测试结果并验证了该方法的正确性。     

NETS OF LF SETS IN LF SUM─TOPOLOGICAL SPACES

ＮＥＴＳＯＦＬＦＳＥＴＳＩＮＬＦＳＵＭ─ＴＯＰＯＬＯＧＩＣＡＬＳＰＡＣＥＳ￥ＺｈｕＭｉｎｇｋｕｉ；ＳｕｎＱｕｎ（ＴｈｅＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ）Ａｂｓｔｒａｃｔ：Ｉｎｔｈｉｓｐａｐｅｒ，ｗｅｄｉｓｃｕｓｓｔｈｅｒｅｌａｔｉｏｎｏ...     

苯乙烯—甲基丙烯酸共聚物的合成,结构与性能研究

采用悬浮聚合法合成了苯乙烯－甲基丙烯酸共聚物（ＳＭＡＡ），得率为９２％左右。由Ｋｅｌｅｎ－Ｔｕｄｏｓ法求得苯乙烯（Ｓｔ）与甲基丙烯酸（ＭＡＡ）在８０℃进行共聚反应的竞聚率为Ｔｓｔ＝０．３０５，ＴＭＡＡ＝０．６００。通过正交试验，确定了最佳配方。经ＦＴ－ＩＲ、ＤＳＣ、元素分析、化学滴定、ＧＰＣ等表征，证实了所合成的产物为透明的苯乙烯－甲基丙烯酸无规共聚物。研究表明，ＳＭＡＡ的耐热性比ＰＳ好得多，其玻     

GSTN可视电话终端的设计研究

在概述了ＩＴＵ－Ｔ Ｈ．３２４建议并介绍了美国Ａｎａｌｏｇ Ｄｅｖｉｃｅｓ公司的数字信号处理器ＡＤＳＰ－２１０６１后，着重介绍了利用ＡＤＳＰ－２１０６１按Ｈ．３２４建议设计开发的ＧＳＴＮ可视电话终端模型，并对其组成，特点进行了分析和讨论。     

降低聚腺苷二磷酸核糖聚合酶活性对外源癌基因诱导的NIH3T3转化的逆转作用研究

用ＰＡＲＰ酶抑制剂苯甲酰胺（ＢＡ）处理经ｃ－Ｈａ－Ｔ２４－ｒａｓ活化癌基因转染的ＮＩＨ３Ｔ３细胞得到转化细胞系，结果表明：经苯甲酸胺处理的细胞系，其细胞凝集、血清依赖性、形态特征等均发生了改变，呈现出正常细胞的特征．Ｓｏｕｔｈｅｒｎ杂交结果表明，已整合到细胞基因组中的外源Ｔ２４～ｒａｓ基因发生了丢失．     

拟环中幂等元和半幂等元

拟环中幂等元和半幂等元Ｗ．Ｂ．ＶａｓａｎｔｈａＫａｎｄａｓａｍｙ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓＩｎｄｉａｎＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙＭａｄｒａｓ－６０００３６，Ｉｎｄｉａ）ＩＤＥＭＰＯＴＥＮＴＳＡＮＤＳＥＭＩ－ＩＤＥ...     

碱性蛋白酶Alcalase水解WGP制备ISWGPH的研究

本文采用ｐＨ－ｓｔａｔ法测定ＷＧＰ的水解度。正交实验确定了Ａｌｃａｌａｓｅ水解ＷＧＰ的最佳工艺条件为：Ｔ＝５０℃；ｐＨ－８．５；「Ｓ」＝１０％；「Ｅ／Ｓ」＝２４ＡＵ／ｋｇ蛋白质；ｔ＝３００ｍｉｎ。将ＷＧＰ水解物的Ｐ 到４．０，离 离后上清液，经活性碳处理处理和干燥后得到了等电点可溶性ＷＧＰ水解－ＩＳＧＰＨ。     

季鏻盐同阴离子对铝缓蚀的协同作用

在１ｍｏｌ·Ｌ－１Ａｌ（ＣｌＯ４）３溶液中，用微分极化电阻测量技术和交流阻抗法研究阴离子ＳＨ－和ＳＣＮ－对溴化丁基三甲基　（ＢＴＭＰＢ）对铝的缓蚀作用及吸附行为的影响．结果表明，ＳＨ－和ＳＣＮ－能显著提高ＢＴＭＰＢ对铝的缓蚀效率，两者和ＢＴＭＰＢ对铝的缓蚀具有明显的协同作用．在高氯酸铝溶液中ＢＴＭＰＢ在铝／溶液界面上的吸附服从Ｌａｎｇｍｕｉｒ吸附等温式，且为物理吸附，但是当在１ｍｏｌ·Ｌ－１高氯酸铝溶液中加入１×１０－４ｍｏｌ·Ｌ－１的ＳＨ－或ＳＣＮ－时，ＢＴＭＰＢ在铝／溶液界面上的吸附为化学吸附，且服从修正的Ｂｏｃｋｒｉｓ－Ｓｗｉｎｋｅｌｓ吸附等温式。     

简易多用微型实验装置

简易多用微型实验装置邹荣贤（四川师范学院化学系，南充６３７００２）ＡＳＩＭＰＬＥＢＵＴＭＵＬＴＩ－ＰＵＲＰＯＳＥＭＩＮＩ－ＥＸＰＥＲＩＭＥＮＴＤＥＶＩＣＥ￥ＺｈｏｕＲｏｎｇｘｉａｎ（Ｄｅｐｔ．ｏｆＣｈｅｍｉｓｔｒｙ，ＳｉｃｈｕａｎＴｅａｃｈｅｒｓＣｉ...     

降低聚腺苷二磷酸核糖聚合酶活性对外源癌基因诱导的NIH…

用ＰＡＲＰ酶抑制剂苯甲酰胺（ＢＡ）处理经ｃ－Ｈａ－Ｔ２４－ｒａｓ活化癌基因转染的ＮＩＨ３Ｔ３细胞得到转化细胞系，结果表明，经苯甲酰胺处理的细胞系，其细胞凝集，血清依赖性，形态特征等均发生了改变呈出现正常细胞的特征，Ｓｏｕｔｈｅｒｎ杂交结果表明，已整合到细胞基因组中的外源Ｔ２４－ｒａｓ基因发生了丢失。     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

前混合磨料射流系统性能和结构的改进

针对前混合磨料射流系统存在的磨料涌出而导致对系统管件 ,尤其是喷嘴产生磨损的问题 ,对原有的射流系统进行了分析 .在分析结果的基础上 ,提出了 3种改进型系统 .对改进型系统进行了定性的理论分析 ,用试验手段得到高压管路的波速值 ,并用试验检验的方法得出了 3种改进型系统性能优劣的比较 ,认为改进 型系统较好的解决了磨料涌出并磨损管路元件的问题 .图 6 ,表 2 ,参 6     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

微生物作用下混凝土裂缝修复效果试验研究

微生物矿化作用可以有效愈合混凝土裂缝,达到修复混凝土裂缝的目的.本文以带裂缝混凝土为研究对象,设置0.2、0.3、0.6 mm三个裂缝宽度和20、30 mm两个裂缝深度,以巴氏芽孢杆菌为菌株,通过裂缝观测、超声波测试、立方体抗压强度测试及裂缝内部微生物沉积物质的微观形貌分析,研究微生物对不同深度及宽度混凝土裂缝的修复效果.研究结果表明:巴氏芽孢杆菌可有效修复混凝土表面裂缝;氧气的供给是微生物在裂缝内部矿化的重要环境条件,随着裂缝深度的增加,巴氏芽孢杆菌的修复效果减弱;随着裂缝宽度的增大,微生物在裂缝内部的矿化效果减弱.     

诗与"在"--海德格尔诗学的阐释

海德格尔对荷尔德林诗歌的阐释，目的是进行诗与思的对话，归根结底还是探讨存在。诗与“在”的关系，是海氏诗学框架的核心内容，诗与“在”的关系又进一步引申为艺术与真理的关系，本从真理如何被遮蔽的问题入手，试图读解海德格尔诗学的内涵。艺术是无蔽的真理显明的一种方式，诗是危机的拯救，语言是存在的家园。海德格尔对诗与在的探讨最后又转入了对语言的探讨，无法走出语言的牢笼。只有在实践中，把艺术变成为社会变革的一个因素，才可以解放被传统理性压迫的力量，显现艺术的真理，确立艺术的价值。     

石油勘探开发建设项目评价系统探讨

石油勘探开发建设项目评价是石油勘探开发建设项目管理的重要内容之一,也是提高项目决策科学性的一个重要环节。首先分析了石油勘探开发建设项目评价的理论和方法,然后从项目前评价、项目中评价、项目后评价、技改项目评价四部分讨论了项目评价的基本内容,并在此基础上构建出了新的项目评价系统。指出:新的项目评价系统与传统的评价系统[1]的最大区别在于增加了项目中评价内容,并且对其它大、中型建设项目也是适用的。     

普通话朗读中的停延

学习普通话的重要环节是在语流中模仿普通话的节律。停延作为节律的基础,确定了语流中的音步组合,进而关系到协同发音、连续变调等一系列语音现泉。停延的研究对于普通话的朗读教学具有重要的现实意义。该文以《普通话水平测试实施纲要》提供的60篇短文为语料,对于文中的停顿做出了定量、定性的分析：普通话的音步组合层的平均长度为5—7个音节,影响各篇短文音步组合层长度的主要因素是文体风格。该文根据60篇短文的语音资料,提出了设置句中无标点停顿的语义原则、语法原则、语用原则。根据语义原则,只能在有助于语义表达的地方停顿。根据语法原则,只能在构成语法结构的地方停顿。如果在某种情况下构成了非语法停顿,那是为了满足节律的需要。根据语用原则,人们通过对语境的分析,以停顿为手段,实现表情达意的最佳效果和节奏的匀称感。文中以大量例句,对各种语法结构中的语音停顿现泉进行比较说明,做出了令人信服的阐释。     

“物理”流变考

“物理”一词,在中国古代最早见于战国,此后在各种典籍中被广泛使用。其含义泛指万物之理与自然规律,这种含义与西方古代“物理”一词的含义相近,明清时期西学东渐,“物理”一词的翻译几经变化,古代日本的科学在相当程度上受到中国的影响,17世纪至19世纪上半叶来华传教士译述的物理书籍也在日本被注释翻译,甲午战争后,中日两国之间科技交流的态势发生了逆转,19世纪下半叶至20世纪初,日中两国“物理”一词的译名先后确定,随着现代物理学的迅速发展,物理学研究的范围和对象又在不断地变化。