新型陆用压电检波器在滩浅海地区地震勘探中的应用及效果

滩浅海地区所特有的复杂地表和表层结构条件给采集高品质的地震资料带来了一定的困难,也因此成为制约该类地区油气开发的主要因素之一。为此。开展了滩浅海地震水陆两用压电检波器的研究。阐述了陆用压电检波器的工作原理,分析了陆用压电检波器的实际应用效果。从单炮记录和地震剖面的信噪比、分辨率、频宽、主频以及能量等诸方面将其与AG3加速度检波器、常规检波器以及水上压电检波器进行了对比分析。结果表明,相对于其他检波器来说,在频谱、分辨率以及高频响应方面。陆用压电检波器在滩浅海地区采集的地震数据具有明显的优势,且陆用压电检波器具备了水听器的一些功能,能够解决滩、浅海结合部的过渡问题。     

Electrochemical detection method for nonelectroactive and electroactive analytes in microchip electrophoresis

In this work, we establish an indirect amperometric detection method via mounting a single carbon fiber disk working electrode in the end part of a microchannel. This in-channel configuration for microchip capillary electrophoresis brings about that the potential of the working electrode in the case of electrochemical reduction reaction is coupled by the separation electric field, while the potential of the working electrode in the case of electrochemical oxidation reaction is not coupled by the separation electric field. Such a special performance provides a convenient and sensitive approach for indirectly detecting nonelectroactive analytes that relies on amperometric response of dissolved oxygen in solution and directly detecting electroactive analytes based on their own amperometric response on the carbon fiber electrode. This method has shown its essential importance in the analysis of inorganic cations, biomolecules, and electroosmotic flow rates. Based on preliminary results, a detection limit of 1.0 microM for K(+) and Na(+) have been achieved.     

Preparation of tricalcium phosphate/alumina composite nanoparticles and self-reinforcing composites by simultaneous precipitation

The composite nanoparticles and corresponding self-reinforcing composites comprising tricalcium phosphate (TCP) and alumina (Al₂O₃) were synthesized by simultaneous precipitation from the CaCl₂, AlCl₃ and (NH₄)₂HPO₄ aqueous solutions, using aqueous NH₄OH as precipitant. Influences of the precipitating media pH and the Ca/P atomic ratios on phase composition and morphology of the composites were investigated. Results showed that except for the major phases -TCP and -Al₂O₃, there was always a third minor phase in the calcined composites coprecipitated either in neutral or alkaline condition. Formation of -TCP is, however, favored at pH 9.2, whereas more of the third phase, mainly AlPO₄, is formed under neutral condition. High Ca/P ratios suppress the formation of -Al₂O₃ phase under alkaline precipitating condition, but the effect is less significant in neutral condition. TEM observation showed that the as prepared composite particles are nano-sized but interconnected to form a network-like morphology. They were changed to a core-shell-like structure after calcination, while their nano-scale dimension was retained. FEGSEM analysis revealed that the -Al₂O₃ phase in the sintered composite compacts was in the form of fibrils dispersed in the phosphate phases. These in situ formed fibrils impart a unique role in self-reinforcement of the sintered composites. Mechanical measurements showed that the incorporation of alumina reinforced -TCP effectively: the flexural strength increased from 15 MPa of the pure -TCP to 84 MPa of the composite with 40 wt% of -Al₂O₃.     

基于Java的多功能XML工作引擎

运用Java和XML技术开发的应用软件平台有很多优点,而采用电子邮件代替网络连接作为信息交换的载体能够增强系统的安全性,本文介绍了一个基于电子邮件的Java-XML工作引擎－XMLInterchange,重点描述XMLInterchange的设计,实验“并给出了一个XMLInterchange作为电子商务平台的应用实例－电子传单。     

SSTT: Efficient local search for GSI global routing

In this paper, a novel global routing algorithm is presented for congestion opti-mization based on efficient local search, named SSTT (search space traversing technology). This method manages to traverse the whole search space. A hybrid optimization strategy is adopted,consisting of three optimization sub-strategies: stochastic optimization, deterministic optimiza-tion and local enumeration optimization, to dynamically reconstruct the problem structure. Thus,“transition” can be made from a local minimum point to reach other parts of the search space,traverse the whole search space, and obtain the global (approximate) optimal routing solution.Since any arbitrary initial routing solution can be used as the start point of the search, the initial-ization in SSTT algorithm is greatly simplified. SSTT algorithm has been tested on both MCNC benchmark circuits and industrial circuits, and the experimental results were compared with those of typical existing algorithms. The experimental results show that SSTT algorithm can obtain the global (approximate) optimal routing solution easily and quickly. Moreover, it can meet the needs of practical applications. The SSTT global routing algorithm gives a general-purpose routing solution.     

Spectroscopic features of dual fluorescence/luminescence resonance energy-transfer molecular beacons

Molecular beacons have the potential to become a powerful tool in gene detection and quantification in living cells. Here we report a novel dual molecular beacons approach to reduce false-positive signals in detecting target nucleic acids in homogeneous assays. A pair of molecular beacons, each containing a fluorescence quencher and a reporter fluorophore, one with a donor and a second with an acceptor fluorophore, hybridize to adjacent regions on the same target resulting in fluorescence resonance energy transfer (FRET). The detection of a FRET signal leads to a substantially increased signal-to-background ratio compared with that seen in single molecular beacon assays and enables discrimination between fluorescence due to specific probe/target hybridization and a variety of possible false-positive events. Further, when a lanthanide chelate is used as a donor in a dual-probe assay, extremely high signal-to-background ratios can be achieved owing to the long lifetime and sharp emission peaks of the donor and the time-gated detection of acceptor fluorescence emission. These new approaches allow for the ultrasensitive detection of target molecules in a way that could be readily applied to real-time imaging of gene expression in living cells.     

Phase-shifting with computer-generated holograms written on a spatial light modulator

We propose a new computer-controlled phase-shifting method based on computer-generated holograms (CGHs) displayed on a spatial light modulator (SLM). In this method the accurate phase shifts required in phase-shifting digital holography or interferometry are induced by a suitable transformation of the encoding patterns of the CGH displayed on a SLM. Both the theoretical analysis and the experimental results demonstrate the feasibility of this approach. We also discuss possible applications of this method in the field of interferometric null testing of aspheres.     

Modeling and computer simulation of ultrasonic/sonic driller/corer (USDC)

Simulation and analytical models for the ultrasonic/sonic drill/corer (USDC) are described in this paper. The USDC was developed as a tool for in-situ rock sampling and analysis in support of the NASA planetary exploration program. The USDC uses a novel drive mechanism, which transfers ultrasonic vibrations of a piezoelectric actuator into larger oscillations of a free-flying mass (free-mass). The free-mass impact on the drill bit creates a stress pulse at the drill tip/rock interface causing fracture in the rock. The main parts of the device (transducer, free-mass, bit, and rock) and the interactions between them were analyzed and numerically modeled to explore the drive mechanism. Each of these interactions is normally described by a time-dependent 2- or 3-D model involving slowly converging solutions, which makes the conventional approach unsuitable for USDC optimization studies. A simplified integrated model using tabulated data was developed to simulate the operation of the USDC on desktop PC and successfully predicted the characteristics of the device under a variety of conditions. The simulated results of the model and the experimental data used to verify the model are presented.     

微污染水源水的处理技术研究

针对齐鲁石化公司某水源地已受石油化工污染 ,采用“吹脱 +气浮 +生物接触氧化 +微絮凝—深床过滤”工艺流程进行了动态模拟试验。试验结果完全达到了设计处理出水标准。     

关于公路监理工作中如何搞好"三监控二管理”的认识

通过对交通公路监理工作的实践,就如何搞好"三监控、两管理”的体会进行了总结归纳,以与同行参考和商榷.