应变栅结构参数对合金薄膜传感器应变传递的影响

应变栅作为薄膜传感器的关键组成部分,其结构参数直接影响着合金薄膜传感器中应变传递效果。基于剪滞理论研究了应变栅的结构参数对应变传递误差的影响,并推导了合金薄膜应变片的应变传递函数;采用有限元软件模拟仿真了薄膜电阻应变片应变栅栅厚在0.001～0.02 mm、栅长在20～50 mm以及栅宽在0.1～0.4 mm范围内对应变传递的影响,并对上述分析的结果进行了实验验证。结果表明：在选定的范围内,应变栅厚度越小、纵栅长度越长、纵栅宽度越窄,应变传递误差越小;各结构参数对应变传递的影响程度为：栅宽>栅长>栅厚;当栅厚为0.001 mm、栅长为3 mm、栅宽为0.1 mm时,应变传递误差最小为3.4%。     

快速热氮化改善n-MOSFET栅氧化层的加速击穿

研究不同类型、不同沟道长度的ｎ沟金属－氧化物－半导体场效应晶体管（ＭＯＳＦＥＴ）在不同栅电压下工作时栅氧化层的击穿特性。结果表明，ＭＯＳＦＥＴ栅氧化层的加速击穿起因于沟道大电流，而栅氧化层进行快速热氮化可极大地改善其栅氧化层的击穿特性。     

快速热氮化改善n—MOSFET氧化层的加速击穿

研究不同类型，不同沟道长的ｎ沟金属－氧化物－半导体场效应晶体管在不同栅电压下工作时栅氧化层的击穿特性。结果表明，ＭＯＳＦＥＴ栅氧化层的加速击穿起因于沟道大电流，而栅氧化层进行快速热氮化可极大地改善其栅氧化层的击穿特性。     

Au／MoO3和Pt／MoO3薄膜光致变色反应的研究

报道了金属Ａｕ或Ｐｔ与ＭｏＯ３薄膜形成的肖特基结对ＭｏＯ３薄膜光致变色的增幅作用。纯粹的ＭｏＯ３薄膜只对紫外光有响应，但经过阴极极化处理后，薄膜就有产生可见光变色效应。为了提高变色效率，在薄膜表面蒸镀一层金属Ａｕ（或Ｐｔ），ＭｏＯ３薄膜的紫外和可见光致变色能力都有大幅度提高。这可用金属Ａｕ或Ｐｔ与ＭｏＯ３之间形成的特殊结构－肖特基结来解释。Ｐｔ与ＭｏＯ３的Ｆｅｒｍｉ能级差大于Ａｕ与ＭｏＯ３的Ｆｅｒ     

难熔金属及硅化物薄膜制备技术研究

本文对难熔金属及其硅化物的形成，特性进行了研究。主要对难熔金属Ｍｏ、难熔金属硅化物ＴｉＳｉ，ＰｔＳｉ２等进行了探讨，采用溅射难熔金属，热硅化反应的手段，对解决ＶＬＳＩ工艺的某些问题，如：解决由于ＭＯＳ电路图形尺寸缩小带来的栅电阻增大的问题以及采用硅化物－阻挡层－Ａｌ多层金属布线，解决欧姆接触和铝的电迁移问题起了极好的作用。     

聚酰亚胺薄膜电容栅FET湿度传感器的研制

一种聚酰胺（ＰＩ）薄膜电容栅ＦＥＴ微型湿度传感器已经初步研制成功。这是一个ｎ沟道壁强型器件，具有曲折栅结构，沟道长约１０μｍ，宽〉８０００μｍ；栅区绝缘层厚约３３０００Ａ（ＳｉＯ２＋Ｓｉ３Ｎ４）；一个ＡｕＰＩ－Ａｌ纵向湿敏电容覆植于绝缘栅上，本文叙述了该ＰＩ－ＨＵＭＦＥＴ的结构设计，工作原理和主要性能，对某些有关问题进行了初步讨论。     

金属—铁电薄膜—半导体结构的电容—电压特性理论分析

用半导体理论讨论了金属－铁电薄膜－半导体（ＭＦＳ）结构的电容－电压（Ｃ－Ｖ）特性，其结果表明：在ｎ型Ｓｉ基片上，理想ＭＦＳ的Ｃ－Ｖ曲线为逆时针回滞，有载流子注入的ＭＦＳ结构的Ｃ－Ｖ曲线为顺时针回滞，这与实验结果是一致的。     

MgF_2薄膜器件的结构、导电和发光

通过蒸镀ＭｇＦ２薄膜制作了一种可均匀发射可见光的新型金属一绝缘体一金属结型发光器件。论证了它的内层结构、导电机理及其发光的物理图象：Ｓｃｈｏｔｔｋｙ热电子在Ａｕ－真空界面激发表面等离极化激元（ＳＰＰ）；Ａｕ－真空界面的ＳＰＰ通过表面粗糙度与外光子耦合。这一图象与该器件的电流－电压（Ｉ－Ｖ）、电流－温度（Ｉ－Ｔ）关系及其发射光谱的主要特征一致。     

成果推广

电阻应变式纳米膜压力传感器该产品是基于金属应变原理而制成 ,其敏感元件是金属弹性体上的多层纳米膜结构 .弹性体采用经处理的金属圆形平膜片 ,在精密抛光的膜片上制作纳米固体Ta2 O5 薄膜离层 ,然后 ,在其上再制作纳米量能的Ni-Cr薄膜功能材料 ,通过微细加工技术构成惠斯登电桥 ,电桥电阻用纳米SiO2 膜钝化保护 ,应变信号用金丝引出 .当被测压力用膜片上时 ,膜片立即产生弹性形变 ,应变电阻发生变化 ,电桥失去平衡 ,从而产生与被测压力成正比的电压信号 ,以实现对被测压力的准确测量 .该产品采用甚低能离子加速器轰击的动能转换搬迁原…     

金属薄膜裂纹扩展的分子动力学研究

研究了冲击载荷作用下金属薄膜表面裂纹扩展的微观机制,采用分子动力学方法对Cu薄膜进行模拟计算,求得冲击载荷作用下带有表面裂纹模型的系统动能、应力、应变及微观结构变化图.当系统从压应力转变为拉应力状态时,裂纹上的原子获得较大动能,裂纹尖端原子开始发生溅射,继而晶格内部出现空位.当拉应力达到364385MPa时,空位扩大形成裂尖钝劈现象,裂纹发生扩展.结果表明:在高速冲击载荷作用下,金属薄膜裂纹扩展主要原因是系统能量和应力的变化使得微裂纹尖端出现钝劈损伤.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

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.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.