非接触纳米三维表面形貌测量

提出了一种基于激光的Raman -Nath衍射和光干涉进行纳米级测量的光机电一体化的新方法 ,分析了数字鉴相、A/D变换和X/Y驱动的特点 ,并对测量精度进行了扼要地分析     

铂合金催化网焊接参数分析

在铂合金催化网的制造中，一般采用下料拼焊的方法满足幅宽与网径的要求。催化网在应用中，要经受高温、氧化、压力、冲击、摩擦磨损的作用，本文据此对催化网的焊接过程参数进行一般分析。     

Surface Plasmon Amplification in Planar Metal Films

The propagation and amplification of surface plasmon polaritons (SPPs) is studied at the interfaces between metals and active media. A permittivity renormalization technique is proposed and developed to obtain an explicit analytic expression for the critical gain required to achieve infinite SPP propagation length. A specific multiple quantum-well (MQW) system is identified as a prospective medium for demonstrating efficient SPP amplification at telecommunication frequencies. The proposed system may have a strong impact on a variety of photonic devices ranging from plasmonic nanocircuits, subwavelength transmission lines and plasmonic cavities to nanosized transducers.     

内蒙古河套地区甜菜复播母根采种技术

介绍了内蒙古河套地区采用麦收后复播母根方式繁殖甜菜种子的技术要点，提出了生产中常见的问题及解决方法。     

A New Contention Resolution Procedure for HFC Access Networks and its Performance Evaluation

Bidirectional Cable TV networks using hybrid fiber coaxial (HFC) systems are good examples of broadcast environments where a contention resolution algorithm is needed in order to allocate the multiaccess medium among various customers. The medium access control (MAC) scheme, proposed by DAVIC/DVB, IEEE 802.14 and DOCSIS for the upstream channel of HFC access networks is based on a mixable contention-based/contentionless time slot assignment. Contention-less (CL) slots are assigned by the head-end (HE) to end stations according to a reservation scheme. Contention-based slots (CB) are randomly accessed by active terminals without any prelimanry allocation and so collisions may occur. To resolve contention the contention tree algorithm has been widely accepted by the DVB/DAVIC, IEEE 802.14 and DOCSIS standards for MAC because of higher throughput and lower access delay. In this paper we propose a simple modification to the existing protocol and analyze its performance. We propose to have one slot in the frame exclusively reserved for the new arrivals that wish to access the channel capacity using contention resolution and atleast one more slot reserved for resolving their contention if there was a contention in the arrival slot. This assumption simplifies the protocol to a queuing mechanism and we use the results of the queue to analyze the protocol. The queuing analysis method is used to determine the throughput of the channel and waiting times of the arbitrary customers. Furthermore, we present numerical results and compare that with simulations.     

Toward a typology of construction mediator tactics

The use of assisted negotiation plays a pivotal role in dispute settlement. Mediation is a notable example and has gained popularity because of the cost and time advantages. In a mediation, the tactics used by the mediator can be decisive. Construction has been described as a litigious industry and despite the vast numbers of mediation conducted, research on mediator tactics remains few. This paper reports a study directed at developing a typology of tactics used in construction mediation. Mediator tactics and mediation outcomes were firstly long listed from review of literatures. Data on the usefulness of tactics used and the outcome achieved were solicited from practicing mediator. Exploratory Factor Analysis (EFA) and Cluster Analysis (CA) were then used to identify the group structures. The results obtained from these two statistical tools were compared using the approach suggested by Newby et al. [Associations of empirically derived eating patterns with plasma lipid biomarkers: a comparison of factor and CA methods. American Journal of Clinical Nutrition 2004;80:759–67]. As such, the group structure obtained from the EFA was preferred than those from the CA. This finding supports the general observation that the structure of EFA is more adaptive. The grouping is further confirmed by a structural equation modeling (SEM) and provides a convenient platform for further research in construction mediation. The potential applications of the typology include effectiveness of construction mediator, behavior and strategic choice of tactics. Furthermore, with a typology of construction mediator tactics, the application can also be extended to study the responses of disputants respective to mediator tactics. It is believed that these applications are of both academic and practical value to the development of construction mediation.     

基于遗传算法的信息检索技术

随着万维网(WWW)中信息量呈指数的增长，人们可以使用许多的信息收集工具来获得网络中的信息。但要使检索到的信息在满足用户个性化需求方面，即具有高准确率又有高回收率，则是一件很困难的事情。为了解决以上问题，该文阐述了遗传算法在信息检索方面的应用。     

RuS,RuS2,10H2O新型化合物的合成与研究

采用硫代乙酰胺(CH_3CSNH_2)均相沉淀Ru(Ⅳ),人工合成了一种新的钌硫化合物。经扫描电镜(SEM)能谱分析,微库仑滴定分析,氢还原特性研究,DSC与DTG测定及红外光谱(IR)分析,测定该化合物的分子式为:RuS·RuS_2·10H_2O_oX-射线衍射鉴定为非晶态。将该化合物密封在真空石英管内,经520℃,40h热处理,产物热分解脱S并晶化为晶态Ru与晶态RuS_2。     

Influence of H2 on the response of lean premixed CH4 flames to high strained flows

A combined experimental and numerical investigation on the effects of H₂ addition to lean-premixed CH₄ flames in highly strained counterflow fields (with strain rates up to 8000 s⁻¹) using preheated flows indicate significant enhancement of lean flammability limits and extinction strain rates for relatively small amounts of H₂ addition. Numerical modeling of the counterflow opposed jet configuration used in this study indicated extinction strain rates which were within 5% of experimentally measured values for equivalence ratios ranging from 0.75 to less than 0.4. Both experimental and numerical results indicate that increasing H₂ in the fuel significantly increases flame speeds and thus extinction strain rates. Furthermore, increasing H₂ decreases the dependency of extinction equivalence ratio on the strain rate of the flow. For all of the mixtures investigated, extinction temperatures depend primarily on equivalence ratio and not fuel composition for the range of H₂ content studied, which suggests that extinction can be correlated to flame temperature and O₂ concentration. Nonetheless, H₂ addition greatly increases the maximum allowable strain rate before extinction temperatures are reached. Inspection of the model-predicted species profiles suggest that the enhancement of CH₄ burning rates with H₂ addition is driven by early H₂ breakdown increasing radical production rates early in the flame zone to enhance CH₄ ignition under conditions where otherwise CH₄ combustion might be prone to undergo extinction.     

Simultaneous measurement of in-plane and out-of-plane displacement derivatives using dual-wavelength digital holographic interferometry

The paper introduces a method for simultaneously measuring the in-plane and out-of-plane displacement derivatives of a deformed object in digital holographic interferometry. In the proposed method, lasers of different wavelengths are used to simultaneously illuminate the object along various directions such that a unique wavelength is used for a given direction. The holograms formed by multiple reference-object beam pairs of different wavelengths are recorded by a 3-color CCD camera with red, green, and blue channels. Each channel stores the hologram related to the corresponding wavelength and hence for the specific direction. The complex reconstructed interference field is obtained for each wavelength by numerical reconstruction and digital processing of the recorded holograms before and after deformation. Subsequently, the phase derivative is estimated for a given wavelength using two-dimensional pseudo Wigner-Ville distribution and the in-plane and out-of-plane components are obtained from the estimated phase derivatives using the sensitivity vectors of the optical configuration.