三轴光纤陀螺用3×3集成光学光开关

三轴光纤陀螺用3×3集成光学光开关     

二元光学二维激光扫描器设计

提出一种新型的二元光学二维纯位相型激光扫描器。首先利用计算全息图ＣＧＨ的设计方法设计出扫描器的初始结构参数，最后把其看成衍射光学元件（ＤＯＥ）对其进行成象质量优化。设计出一电视制式的二维扫描器，其扫描范围为±１２．５°×（±１０°）（水平×垂直），光斑尺寸约１ｍｒａｄ。     

调频光纤陀螺中的集成光学频移器

报道了一种在Ｙ一切铁扩散ＬｉＮｂＯ３平板光波导上制作的调频光纤陀螺用集成光学频移器。它由一对球面波导短程透镜和两个声表面波声光调制器组成。频移宽度为１０ＭＨｚ，调制器的中。Ｃ频率为１０７ＭＨｚ，驱动功率为２００ｍＷ。     

LiNbO3薄膜的研究进展

LiNbO3薄膜具有优良的压电、热释电、声光及非线性光学特性，在光电子学及集成光学等领域有许多重要应用，着重介绍LiNbO3的结构，性质与薄膜制备技术，以及在光通信领域中的应用。     

聚苯硫醚合成反应的动力学研究

以脱水硫化钠和对二氯苯为单体，在六甲基磷酰三胺溶剂中常压下研究了聚苯硫醚合成的反应动力学。结果表明，该聚合反应符合二级反应动力学规律，在１８２、１９２、２０２和２１２℃条件下的聚合反应速率常数分别为１．７５×１０~（－４）、３．０２×１０~（－４）、５．５６×１０~（－４）和１．３１×１０~（－３）ｋｇ／ｍｏｌ·ｓ，反应的活化能为１２３ｋＪ／ｍｏｌ。     

光子技术及光电子技术在未来电子战中的应用

本文叙述了光子技术和光电子技术在未来电子战中的一些应用。这些技术包括光纤技术、光电集成技术、声光技术和光学双稳态技术等。     

HT－7托卡马克的八管弹丸注入器

介绍了用于ＨＴ－７托卡马克的的八管弹丸注入器的物理、工程设计原理和结构特点及配置的各种诊断手段。注入器采用气动发射技术，弹丸为１ｍｍ×１ｍｍ，１．２ｍｍ×１．２ｍｍ，１．５ｍｍ×ｌ．５ｍｍ圆柱体氢丸，丸速０．８～１．５ｋｍ／ｓ工作频率１～８Ｈｚ。     

声光滤光器在膜厚测量上的应用

本文对利用声光可调滤光器测量薄膜的光学厚度进行了理论探讨,并在实验中加以证实。     

一种新颖的超大点阵分束实现方法

首次提出了一种实现超大卢、阵光束分束的新方法，它是利用位相迭加原理和ＶＬＳＩ技术将光栅分束器和位相型菲涅耳微透镜列阵集成为一体，构成了一种新型的光束分束列阵器件—一菲涅耳计算机源生全息分来器（ＣＧＦＢＳ），以实现１２８×１２８，甚至更高卢、阵数的光点分束。     

声光器件及其性能测定

本文叙述了声光器件的基本工作原理,描述了确定器件特性的方法,并给出了声光偏转器、声光调制器和声光滤光器的实验结果。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.