从地震资料中提取应力信息的动态流体法

动态流体法(DFM)是Pisetski等发明的一项专利技术。其根据由瞬时振幅和瞬时频率计算出的相对压力梯度,精确确定出高渗透、连通性好的裂缝或裂缝状孔隙系统中最可能含流体的盆地区域。本文主要介绍了Pisetski等的不连续模型中的弹性波传播试验和根据3D地震资料估算流体动态参数的方法及应用实例。希望对科研人员了解DFM新技术起一定作用。

用应力信息评定海底隧道安全性的方法研究

厦门东通道(翔安)海底隧道有三分之一长度穿越V级围岩,施工中采用了CRD工法。对于CRD法,目前还没有一个可以实用的位移判定基准,因此,通过位移监控来判定隧道施工安全是比较困难的。而应力是可以直接判断隧道安全性的信息。为此,文章研究了用应力评定海底隧道安全性的方法。该方法将被应用于实际工程中。

磁测应力资料的测井解释方法研究

磁测应力方法是一种可以直接测得钢套管内壁应力分布的新技术。磁测应力信息能够解释套损危险程度和水驱力的方向;套损危险程度与应力检测仪器的信号幅度和发生信号异常的极板数量成正比;应力信号的极性代表套管被挤压或拉伸方向,应力值与信号幅度成正比;由6个极板测量的数据信息构成的平面矢量图对解释分析套管受力方向及其相对大小具有实际意义。根据工程需要提出了视应力值的概念,应当从理论和实验2个方面探索磁测应力仪器的刻度方法,这对该项技术发展完善很重要。

Properties of Self-recoverable Mechanoluminescence Phosphor Ca_(5)Ga_(6)O_(14)∶Eu^(3+)and Its Information Encryption Application

A novel self-recoverable mechanoluminescent phosphor Ca_(5)Ga_(6)O_(14)∶Eu^(3+)was developed by the high-tem-perature solid-state reaction method,and its luminescence properties were investigated.Ca_(5)Ga_(6)O_(14)∶Eu^(3+)can produce red mechanoluminescence,and importantly,it shows good repeatability.The mechanoluminescence of Ca_(5)Ga_(6)O_(14)∶Eu^(3+)re-sults from the piezoelectric field generated inside the material under stress,rather than the charge carriers stored in the traps,which can be confirmed by the multiple cycles of mechanoluminescence tests and heat treatment tests.The mechanoluminescence color can be turned from red to green by co-doping varied concentrations of Tb^(3+),which may be meaningful for encrypted letter writing.The encryption scheme for secure communication was devised by harness-ing mechanoluminescence patterns in diverse shapes and ASCII codes,which shows good encryption performance.The results suggest that the mechanoluminescence phosphor Ca_(5)Ga_(6)O_(14)∶Eu^(3+),Tb^(3+)may be applied to the optical infor-mation encryption.

Process model of IT impacts on firm competitiveness based on application capability of information technology

To investigate the process of information technology （IT） impacts on firm competitiveness, an integrated process model of IT impacts on firm competitiveness is brought forward based on the process-oriented view, the resource-based view and the complementary resource view, which is comprised of an IT conversion process, an information system （IS） adoption process, an IS use process and a competition process. The application capability of IT plays the critical role, which determines the efficiency and effectiveness of the aforementioned four processes. The process model of IT impacts on firm competitiveness can also be used to explain why, under what situations and how IT can generate positive organizational outcomes, as well as theoretical bases for further empirical study.

惯性往复直线振动筛动力学特性研究

以TQLZ125型惯性往复振动筛为研究对象,建立其有限元模型并进行动力学响应分析,得到了其振动体振动曲线和应力、应变时间历程分布,根据分析结果对结构的强度进行了校核验证,结果表明现有结构满足强度要求。研究为该类振动设备的强度设计及结构改进提供理论依据。

Magnetic Effects in the Thermodynamics of Information

The authors have shown that the process data can be modeled on the basis of chemical thermodynamics. The authors offer general information of the equation in the presence of a magnetic field. As a result, studies have shown that the magnetic effects strongly influence the thermodynamics of information.

Parikh-Wilczek Tunneling as Massive Particles from Noncommutative Schwarzschild Black Hole

In this paper, we apply the tunneling of massive particle through the quantum horizon of a Schwarzschild black hole in noncommutative spaeetime. The tunneling effects lead to modified Hawking radiation due to inclusion of back-reaction effects. Our calculations show also that noncommutativity effects cause the further modifications to the thermodynamical relations in black hole. We calculate the emission rate of the massive particles＇ tunneling from a Schwarzschild black hole which is modified on account of noncommutativity influences. The issues of information loss and possible correlations between emitted particles are discussed. Unfortunately even by considering noneommutativity view point, there is no correlation between different modes of evaporation at least at late-time. Nevertheless, as a result of spacetime noncommutativity, information may be conserved by a stable black hole remnant.

Non-destructive Evaluation of Absolute Stress in Steel Members Using Shear-Wave Spectroscopy

Non-destructive measurement of absolute stress in steel members can provide useful information to optimize the design of steel structures and allow the safety of existing structures to be evaluated.This paper investigates the non-destructive capability of ultrasonic shear-wave spectroscopy in absolute stress evaluation of steel members.The effect of steel-member stress on the shear-wave amplitude spectrum is investigated,and a method of absolute stress measurement is proposed.Specifically,the process for evaluating absolute stress using shear-wave spectroscopy is summarized.Two steel members are employed to investigate the relationship between the stress and the frequency in shear-wave echo amplitude spectrum.The H-beam loaded by the universal testing machine is evaluated by the proposed method and the traditional strain gauge method for verification.The results show that the proposed method is effective and accurate for determining absolute stress in steel members.

Malaysian Teacher Trainees＇ Competencies of Accessing, Evaluating, and Applying Information Ethically in Research Process

The case study attempts to discover with certainty the competency of accessing, evaluating and applying information in research process acquired by undergraduate trainees of Malaysian Teacher Education Institute in the northern region of Peninsula Malaysia. Considered as highly important skills that trainee teachers have to acquire a comprehensive understanding of information literacy to pursue a research. Yet, it is a pivotal fact indicated by recent researchers that most future teachers often enter teaching without the necessary information literacy skills and knowledge in research process. The scope of study is based on full-time final year undergraduate trainee teachers for the Educational Degree Programme doing their school based action research in the states of Kedah, Perlis, and Penang. The study analyzes problems and issues faced by these trainee teachers tied up to information literacy competency in doing research process. The study investigates trainees＇ competencies of accessing, evaluating, and applying information ethically in their research process. The findings hope to give insights to stake holders on the ways to move forward in terms of needs, process and outcomes in accordance with the Malaysian National Information Literacy Agenda.

Structural Stress Identification Using Fuzzy Pattern Recognition and Information Fusion Technique

In order to ensure the service security of space structures under wind load, the stress identification method based on the combination of fuzzy pattern recognition and information fusion technique is proposed, in which the measurements of limited strain sensors arranged on the structure are used. Firstly, the structure is divided into several regions according to the similarity and the most unfavorable region is selected to be the key region for stress identification, while the different numbers of the strain sensors are located on the key region and the normal regions; secondly, the different stress distributions of the key region are obtained based on the measurements of the strain sensors located on the key region and the normal regions separately, in which the fuzzy pattern recognition is used to identify the different stress distributions; thirdly, the stress distributions obtained by the measurements of sensors in normal regions are selected to calculate the synthesized stress distribution of the key region by D-S evidence theory; fourthly, the weighted fusion algorithm is used to assign the different fusion coefficients to the selected stress distributions obtained by the measurements of the normal regions and the key region, while the synthesized stress distribution of the key region can be obtained. Numerical study on a lattice shell model is carried out to validate the reliability of the proposed stress identification method. The simulated results indicate that the method can improve identification accuracy and be effective by different noise disturbing.

The market reaction on the human resources information disclosure in Chinese listed companies

In this paper, the author uses the listed company＇s annual report and financial statements to do the empirical research, the selected areas are information technology industries. The results show that the average age of employees, professional proportion, and the average assesses and executives＇ shareholdings have no significant impact with P/B. The industry statistics revealed no significant impact between average age and P/B because each group of age has its own advantages. By using these indicators, the author can improve the human resources information voluntary disclosure, make the disclosure of information comparable, and provide the empirical reference to the listed companies.

The Sustainable Development of ICTs in China:An Empirical Study of Small and Medium-Sized Enterprises

The wide application of new information and communication technologies(ICTs) has been argued to be critical to business success of small and medium-sized enterprises(SMEs) ,especially to those in the developing countries.Drawing upon existing literature,this article will examine the determinants of ICTs application in SMEs in China based on data collected from interviews with top managers and/or owners of 70 SMEs.We identify 20 factors affecting ICTs application in SMEs in China and divide them into four broad categories,namely pressures,firm specific factors,technical factors and local milieu.We also pay special attention to the Chinese business environment affecting ICTs application.Our analysis shows that local ICT infrastructure,external pressures from competitors and ICT knowledge of employees are the determinants of Internet application by SMEs,while product characteristics and market target are important factors of e-commerce adoption.

Estimation on structural responses using multi scale measurements

Different measurands from the different types of sensors can obtain different information regarding the structural behavior in a real structural health monitoring system.To enrich information and estimate the structural responses based on much more known information,the estimation on structural responses using multi scale measurements from multi-type sensors is proposed in this paper.Pattern identification is constructed with the pattern library given by strain measurements and deformation measurements.Considering the uncertainty of the measurements as well as to enhance the robustness of the proposed algorithm,more than one best pattern is selected to synthesize the finally estimated stress responses.To validate the capacity of the proposed acquisition method using multi scale measurements,finite element model analysis is conducted to estimate the structural stress response in Shenzhen Bay Stadium as an example.The performance of the pattern identifications,constructed by two kinds of pattern libraries captured by sole strain measurement,and multi scale measurements which are constructed by both kinds of strain measurements and deformation measurements,respectively,are compared in this paper to observe measurements constructed from strain measurements and deformation measurements outperformed others.Errors analysis for a series of parametric studies in which noise at different levels has also included in the measurements are further carried out,and robustness of the proposed information acquisition scheme under noisy measurement is demonstrated.

A New Hybrid Reliability Index Definition and Its Application to the Structure Buckling Reliability Analysis of Supercavitating Projectiles

As structure buckling problems easily arise when supercavitating projectiles operate with high underwater velocity, it is necessary to perform structure buckling reliability analysis. Now it is widely known that probabilistic and non-probabilistic uncertain information exists in engineering analysis. Based on reliability comprehensive index of multi-ellipsoid convex set, probabilistic uncertain information is added and transferred into non-probabilistic interval variable. The hybrid reliability is calculated by a combined method of modified limit step length iteration algorithm(MLSLIA) and Monte-Carlo method. The results of engineering examples show that the convergence of MLSLIA is better than that of limit step length iteration algorithm(LSLIA). Structure buckling hybrid reliability increases with the increase of ratio of base diameter to cavitator diameter, and decreases with the increase of initial launch velocity. Also the changes of uncertain degree of projectile velocity and cavitator drag coefficient affect structure buckling hybrid reliability index obviously. Therefore, uncertain degree of projectile velocity and cavitator drag coefficient should be controlled in project for high structure buckling reliability.