仿激光开系的阻尼振子量子化方案

激光全量子理论对激光开系采用热浴模型进行了量子化。近两年来,文献[1,2]又报道了两种阻尼振子的量子化方案,与激光开系热浴模型比较,迥然不同。本文在简要介绍激光开系热浴模型后,便与文献[1,2]方案进行分析比较,指出这后两种方案存在的困难,并提出仿激光开系的阻尼振子量子化方案。最后求得仿开系方案的Hamiltonian及相应的Schrdinger方程的解及力学量平均值的计算。在量子起伏项不再出现阻尼因子。

非平衡开放系统的第二类涨落-耗散定理与熵增率

该文用含时投影算子方法讨论非平衡开放系统.其环境并非热库并且在开系的影响下线性偏离其初始状态.文中假定体系的宏观统计算符具有广义正则形式,导出了开系的输运方程,第二类涨落-耗散定理及熵增率,并把它们用无规力和相互作用无规力涨落的量子关联函数表出.若环境为热库,则两者均可纳入伏泰拉方程体系.

电介质系统准热力学方法涨落概率分布的推导

推导出了电介质系统准热力学方法的涨落概率分布,证明了类比的方法并不是任何地方都可以用的.

关于多元复相系平衡条件的推倒

文中从平衡判据出发,分别通过熵判据,吉布斯函数判据,内能判据,运用数学归纳法对多元复相系的平衡条件进行了详细的推证,并对这几种方法进行了比较,给出了多元复相系的平衡条件并对其平衡条件的实际应用作了说明。

计算涨落的一种新方法

涨落的热力学方法是一种新的极其简便的求涨落的方法,建议编入教材推广应用。下面将这一方法作一简介。一、涨落均强定理涨落的热力学方法,可从涨落均强定理来建立。而涨落均强定理是准热力学理论中的一个重要定理。

Web service based spatial forest information system using an open source software approach

For technical and other reasons there is a dilemma that data providers cannot find an appropriate way to redistribute spatial forest data and data users who need spatial data cannot access and integrate available forest resources information. To overcome this dilemma, this paper proposed a spatial forest information system based on Web service using an open source software approach. With Web service based architecture, the system can enable interoperability, integrate Web services from other application servers, reuse codes, and shorten the development time and cost. At the same time, it is possible to extend the local system to a regional or national spatial forest information system. The growth of Open Source Software （OSS） provides an alternative choice to proprietary software for operating systems, web servers, Web-based GIS applications and database management systems. Using open source software to develop spatial forest information systems can greatly reduce the cost while providing high performance and sharing spatial forest information. We chose open source software to build a prototype system for Xixia County, Henan Province, China. By integrating OSS packages Deegree and UMN MapServer which are compliant to the OGC open specifications, the prototype system enables users to access spatial forest information and travelling information of Xixia County which come from two different data servers via a standard Web browser and promotes spatial forest information sharing.

Effect of quality uncertainty of parts on performance of reprocessing system in remanufacturing environment

Aimed at the problem of stochastic routings for reprocessing operations and highly variable processing times,an open queuing network is utilized to model a typical reprocessing system.In the model,each server is subject to breakdown and has a finite buffer capacity,while repair times,breakdown times and service time follow an exponential distribution.Based on the decomposition principle and the expansion methodology,an approximation analytical algorithm is proposed to calculate the mean reprocessing time,the throughput of each server and other parameters of the processing system.Then an approach to determining the quality of disassembled parts is suggested,on the basis of which the effect of parts quality on the performance of the reprocessing system is investigated.Numerical examples show that there is a negative correlation between quality of parts and their mean reprocessing time.Furthermore,marginal reprocessing time of the parts decrease with the drop in their quality.

DC—20GHz RF MEMS Switch

The design and fabrication of a RF MEMS switch is reported for the first time in China.The switching element consists of a thin metallic membrane,which has the metal-isolator-metal contact and a capacitive shunt switch as single-pole single-throw.When an electrostatic potential is applied to the membrane and the bottom electrode,the attractive electrostatic force pulls the metal membrane down onto the bottom dielectric.The switch characteristics,such as insertion loss and isolation,depend on the off and on-capacitance.The test results are as follows:the pulldown voltage is about 20V;the insertion loss is less than 0 69dB from DC to 20GHz in the up-state;the isolation is more than 13dB from 14 to 18GHz and 16dB from 18 to 20GHz in the down-state.

Rocky Desertification Dynamic Analysis and the Development of Management Information System

With the background of severe rocky desertification in the west of China and the ohjective of ecological environment construction and poverty elimination, the management information system of rocky desertification was designed according to the natural and humane characteristics in Nanchuan of Sichuan Province. The system was composed of data management module, information query module for rocky desertification, spatial analysis module and dynamic monitoring module.

里兹并合原则的表述

本文指出了某些教材中对里兹并合原则的一种错误表述.

DSS Scheme for Operation Optimization Problem on Power Plants

Based on the target analysis of the operation optimization for power plants, a novel system scheme called operation optimization decision support system (OODSS) is brought forward. According to the structure and design thinking of decision support system (DSS), the overall structure of the OODSS is studied, and the scheme of the sub systems in the OODSS such as the user interface system, the problem processing system, the database system, the model base system, the expert system (ES) and the data mining sy...

Experimental Study of Diesel-NG Dual Fuel Electronic System for F6L912Q Engine

In order to improve the diesel engine emission performance and convert the diesel engine to dual fuel engine, a dual fuel (diesel and compressed natural gas (CNG)) electronic system was developed, in which electromagnetic valves were used to control multi point natural gas injection. The system was designed for type F6L912Q diesel engine and the function of the system was testified on test cell. The test results showed that the system had great advantages in power ability and emission performance. The average CNG substitution at rated load was over 80%. The dual fuel system was practical. To adopt dual fuel system was a good way to improve the engine's emission performance.

Multi-broker architecture for large-scale dynamic heterogeneous information integration

In order to realize interoperability to a large number of autonomous and heterogeneous information sources with high efficiency, an agent-based multi-broker architecture （AMA）-HustEven, is constructed. A group of broker agents are designed to provide brokering services in a peer-to-peer （P2P） manner for the non- broker agents （user agents, resource agents, query agents）. Thus, the scalability and robustness of the system are enhanced. Ontology is also used by the broker agents for facilitating interoperability among all the agents in HustEven. Unlike any other AMAs, an interdomain ontology is built in this system to represent the relationships among the common concepts in the innerdomain ontologies. Therefore, a broker forwards the queries only to the other related brokers according to the interdomain ontology and the communication overhead among the brokers is reduced. Obviously, the application of the interdomain ontology enables a broker to fully take advantage of the multi-broker architecture. The experimental results show that the HustEven performs more efficiently than any other existing systems.

Reliability analysis of anti-pull piles under excavation

The impact of excavation on the reliability of anti- pull piles is studied, and three cases of reliability analysis, named reliability of ultimate limit state （ULS）, reliability of serviceability limit state （SLS） and reliability of system （SYS） are studied. The reduction factor of the pile capacity is used to calculate the reliability indices for the three cases. The ratio ξ of the pile capacity of SLS to the pile capacity of ULS has a significant influence on the reliability indices of SLS and SYS. The mean value μξ of the ratio ξ： is considered as a random variable to study the reliability indices of SLS and SYS. The numerical example demonstrates that the excavation depth and the excavation diameter are proved to have significant influences on the reduction factor of the pile capacity and the reliability indices. The reliability indices decrease with the increase in the excavation depth, and the excavation diameter has a considerable influence on the reliability index when the excavation is relatively deep. In addition, μξ has a significant influence on the reliability indices of SLS and SYS. For a more accurate estimation of μξ, further research should be conducted to study μξ.

科技研究所发展战略问题

当今世界是一个充满激烈竞争的角逐场。特别是由于技术革命的兴起,向我们提出了尖锐的挑战,可以说,已经不宣而战地展开了全球性大竞赛。为了迎接挑战,在竞争中立于不败之地,出现了世界性的“战略研究热”,并形成一门新的学科——“战略科学”。战略研究是领导者决策行为的首要活动,缺乏这一环节,往往导致战略决策的重大失误。大到一个国家,小到一个企业或研究所,都事关重大,直接影响到国家兴衰及事业的成败。道理很简单,因为我们的基本国策之一,是对外开放,对内搞活,在开放、搞活的系统中,不管你愿意如否,都自然地处于开系的动态发展中。

量子统计力学的基本假设

在经典统计力学中研究平衡态问题,是从一个相当自然的基本假设——等几率假设出发的。根据这个基本假设,直接可以采用微正则系综来求孤立系的宏观平衡性质。而有了微正则系综可以得到关于闭系的正则系综和开系的巨正则系综,从而得到所有的热力学规律。平衡态统计物理的等几率假设:①对于孤立系的平衡态说,在求统计平均时,相宇中能量曲面E和E+△E之间相等体积的几率相等。这是整个经典统计力学中唯一的基本假设。

伯努利方程的另一种推导方法

根据连续介质的概念,流体可以看成是由极大数目的流体微团组成的系统。所有的流体微团在宏观上是足够小,而在微观上是足够大。这就是说,在宏观上流体微团可当作质点来处理,但在微观上包含有大量的分子、原子,每个流体微团有确定的物理参量(比如温度,压力,密度等)。因此。

Automobile light control system based on CAN bus and contactless switch

In order to solve the complex wiring and low reliability of conventional light control system,an automobile contactless switch light system is designed combined with Hall element and controller area network （CAN） bus technology.The processing system of electromagnetic compatibility controlled by CAN bus is improved to reduce the electromagnetic interference from the controller and other sources of interference.With Freescale＇s high-performance single-chip MC9S08DZ60 and CAN transceiver TJA1050,the overall circuit design and software design are presented.The test results show that the designed light control system is feasible.

Flowering Characteristics of Japonica Rice Male Sterile Lines Adaptive to High Temperature and Summer Drought

[Objective] This study was conducted to screen japonica rice male sterile lines with good flowering characteristics under high temperature and summer drought. [Method] The flowering habits of 23 japonica male sterile lines, such as flowering peak, single-panicle flowering duration, single-plant flowering duration, en- closed glume rate, glume-opening angle, the distance between glumes, stigma exer- tion rate and sigma vitality, were compared with II-32A as a control under above weather condition. [Result] The flowering characteristics had significant difference a- mong the tested rice lines. Compared with the control, three japonica rice male ster- ile lines 35478A, 35489A and 35502A had better flowering traits, such as earlier flowering peak, longer single-panicle flowering duration, longer single-plant flowering duration, lower rate of enclosed glumes, larger glume angle and larger distance be- tween glumes. 35478A performed its flowering peak from 10：00-11：00 am, 1.5 h earlier than the control; 35489A exhibited higher stigma exertion rate, up to 76.23%; and 35502A had higher stigma vitality, up to 84.68%, which kept longer time than that of the CK. [Conclusion] The results will provide high-quality resources for the breeding of new japonica rice varieties with high-yield and high-temperature toler- ance.

化学平衡的移动量

（一）化学平衡移动的统一定量表示法GB3102.8—82对反应进度的定义为“对于反应O∑BVBB来说,dξ=VB-1dnB,式中nB为物质B的物质的量”其单位名称为摩[尔],符号为mol。ξ是描述化学反应进展程度的状态参变量在等温等压过程中（2G/2ξ）TP=∑VBμB当反应达到平衡时有（2G/2ξ）TP=∑VBμB=0这时的反应进度可称为该反应在确定条件下的反应限度,以ξe表示。ξe是对应确定条件的唯一的值。化学平衡的移动量（以下简称平移量）可用反应限度差△ξe来表示。若以原平衡成分为基础,平移量△ξe可定义为: