| Study of Dynamic Characteristics of a Monsoon Circulation Tube |
10 DEC 93 |
22 pages |
| Authors:
Xu Xiangde; Yin Shuxin; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
 | In China with a prevailing summer monsoon, there is often on mainland China a shear line with east-to-west trend, or a quasistationary rainfall belt on the northern side of a subtropical high pressure. There is ascending movement along the rainfall belt; however, there is a subtropical high ridge line with east-to-west trend to the south of the shear line or the quasistationary front rain belt. Between the shear line and ... |
|
| Military Application and Future Development |
09 DEC 93 |
|
| Authors:
Chang-Guo Zhang; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| Optimum for the Gasdynamic System in a Fast-Axial-Flow CO2 Laser |
09 DEC 93 |
15 pages |
| Authors:
Chengwu An; Shimin Li; Qisheng He; Zaiguang Li; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| It is reported that the temperature rise of the discharge mixture, in a fast-axial-flow CO2 laser, can be decreased by increasing both the mass flow rate and the speed of the mixture through the laser tube. However, increasing the mixture speed, in a practical gas dynamic system, will lead to decreasing the mass flow rate, and thus the discharge tube with appropriate cross section, which matches the properties of the ... |
|
| Practical Design of Resonant Cavity for a RF Free Electron Laser |
09 DEC 93 |
15 pages |
| Authors:
Mingchang Wang; Zhijiang Wang; Huifen Zhou; Chengshi Feng; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| Practical design of the resonant cavity for a RF free electron laser at 10.6 micrometers is proposed. For a given cavity length, the parameters, including the curvature of reflector, waist radius and spot size on reflectors, are calculated according to the Gaussian profile. The problem of spatial match between the radiation and the beam in a long narrow waveguide has been solved and the synchronization is discussed. ANNOTATION: Practical Design ... |
|
| Analysis of a Sandstorm Weather Process |
05 NOV 93 |
|
| Authors:
Dongzhen Yang; Xiangming Ji; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
 | The favourable synoptic situation and climate background for a sandstorm process, which occurred in the period from the 9th to the 16th of April 1988, has been studied through analyzing weather maps, meteorological elements, satellite cloud pictures and sandstorm trajectories. The sand dust origin area, the directions and the paths of sand dust transportation and the extent the sand dust reached were also investigated. The results of measurements and analysis ... |
|
| A Good Proposal Results in Savings of 400,000 Yuan |
05 NOV 93 |
|
| Authors:
Sun Shijie; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| Evaluation of Electroconductivity of Two Surface Paints for Spacecraft |
05 NOV 93 |
15 pages |
| Authors:
Lu Yusun; Li Hua; Han Xiaowen; Chen Wenying; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| This article briefly discusses the manufacturing process for two surface paints (used on spacecraft): No. 956 gray paint, and No. 956 green paint. Experimental studies were conducted on both paints at room temperatures in variations of electroconductivity in space environments: in a simulated space vacuum, under electron radiation and under solar radiation. From the experimental results, the states of both surface paints used in orbit can be predicted. In addition, ... |
|
| Semiconductors A(III)B(VI) |
03 NOV 93 |
16 pages |
| Authors:
G. A. Akhundov; G. B. Abdullaev; G. D. Guseynov; R. F. Mekhtiyev; M. Kh. Aliyeva; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| Semiconductors A(III) B(VI) crystallize in laminated or chain structures and contain nine valence electrons in each molecule. Connection in the layers and the chains is predominantly covalent, and Van der Waal between the layers and the chains. Calculated data of the energy spectrum of these compounds are absent, and the available experimental studies are insufficient for understanding of the zone structures. We have obtained and studied single crystals of GaS, ... |
|
| Effects of Stimulated Raman Scattering on Light Beam Properties During High-Power Laser Beam Long-Path Propagation |
03 NOV 93 |
19 pages |
| Authors:
Chien Lian; Shui Zhan; Zhang Xiaomin; Wei Xiaofeng; Yuan Xiaodong; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| Beginning from the third-order nonlinear polarization from the stimulation and induction of matter based on the semiclassical theory of stimulated Raman scattering (SRS), a theoretical model of coupling between the phase of a pump (transmission) laser beam and the phase of the Stokes beam intensity is established for the case of stimulated Raman scattering during long-path propagation of a high-power laser. The model clearly explains how the SRS effect influences ... |
|
| Investigation of Mesoscale Convective Cloud Clusters in South China |
03 NOV 93 |
26 pages |
| Authors:
Jixi Jiang; Huiming Ye; Meizhen Chen; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| The statistical characteristics of 176 mesoscale convective cloud clusters in South China, which are classified into three types in terms of their size, are analysed based on the short interval GMS images and conventional data during April-October, 1980-1988. Two composite model charts are presented for their formation and development, and two typical cases are studied. Some conclusions can be drawn as follow: (1) Mesoscale convective systems in South China; (2) ... |
|
| Propagation of Cold Air Masses in East Asia and Its Associated Planetary-Scale Function |
03 NOV 93 |
23 pages |
| Authors:
Yihui Ding; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| The present paper has delt with the characteristics of propagation of the winter monsoon during cold air outbreaks for 19 cases of 1980-1984 in East Asia as well as the associated planetary-scale effect. It has been revealed that the propagation of cold air mainly shows a mode of 10-20 day period oscillation. Furthermore, the Siberian cold high associated with outbreaks of cold air may lead to the response of a ... |
|
| Optimization of Control Parameters of Anti-Radiation Missile during Inertial Guidance Stage |
14 SEP 93 |
|
| Authors:
Liu Yuhua; Chui Naigang; Xie Jiuping; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| Carbon/Carbon Composites Coated with SiC by Chemical Vapor Deposition |
14 SEP 93 |
20 pages |
| Authors:
Sun Shoujin; Liu Wenchuan; Li Minjun; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| Oxidation-resistant carbon/carbon (C/C) composites were fabricated by chemical vapor deposition (CVD) of SiC on the surface of C/C composites; the latter were densified in preforms of carbon cloth lay-up by chemical vapor infiltration (CVI) of carbon. The mechanical properties, thermal properties, and the oxidation resistant properties in air of the material are studied. (Author) ANNOTATION: Reprint: Carbon/Carbon Composites Coated with SiC by Chemical Vapor Deposition. |
|
| Single-Transverse-Mode, Narrow-Bandwidth Pulsed Tunable Dye Laser with Hollow Circular Intracavity Dielectric Waveguide |
14 SEP 93 |
14 pages |
| Authors:
Zhengguo Lu; Jianying Zhou; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| This paper presents a tunable, narrow-bandwidth pulsed dye laser with hollow circular intracavity waveguide and grazing-incidence grating. The experimental results show that the laser system can have an output with single transverse mode, narrow bandwidth, and high-efficient laser. The paper analyzes the design mechanism of the system. ANNOTATION: Single-Transverse-Mode, Narrow-Bandwith Pulsed tunable Dye Laser with Hollow Circular Intracavity Dielectric Waveguide - - Transalation |
|
| Dynamic Response Analysis of Composite Structural Members During Missile Launch |
14 SEP 93 |
12 pages |
| Authors:
Lianzhu He; Peiling Zhao; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| By analyzing the dynamic characteristics and the dynamic response of composite structural members of aircraft wings, the article presents the methods and steps for computational analysis, as well as further processing of the analytical results, in addition to suggestions for design improvements. It was found that improved lamina design can eliminate design weakness since local vibration phenomena were discovered in the prototype design when the dynamic characteristics of structural members ... |
|
| The Efficiency of Continuous Output of Some Titanium-Doped Gem-Crystal Lasers Has Exceeded 1 W |
08 SEP 93 |
6 pages |
| Authors:
FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| By use of the Induced Furnace Up-pumping Method (IFUS) developed by ourselves, a new technique enables us to grow a titanium-doped gem crystal which can emit pulses in the forward as well as in the backward direction in the preparation of a continuous laser beam transmission. Since December of 1991 after it first appeared in our country, the continuous transmission of a titanium crystal laser (1) with hydrogen ion laser-pumping ... |
|
| The Activities of Equatorial Anticyclones of the Western Pacific and the South China Sea and Their Effects on the Tracks of Typhoon Movement |
08 SEP 93 |
21 pages |
| Authors:
Cheng-Lan Bao; Rong-Mao Wei; Chang-Hua Huang; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| This paper carries out a preliminary investigation and analysis of the activities of equatorial anticyclones over the western Pacific and South China Sea. They occur on average 8 times a year and are mostly concentrated during the months of June-September. An equatorial anticyclone is a tropical weather system of meteorological magnitude of 1,000 - 2,000 km. It can continue on for a few days. It is a kind of a ... |
|
| Spatial Distribution of the Threshold Beam Spots of Laser Weapons Simulators |
08 SEP 93 |
21 pages |
| Authors:
Qiwan Fang; Xaohui Zhang; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| This paper was based on the transmission theory of elliptical Gaussian beam fluxes in deriving some transmission equations for the threshold beam spots of laser weapon simulators, in order to revise and expand the expressions for the threshold beam spots, their maximum range, the extinction function and the irradiance in ADA 102276, and also in this paper, verification tests were carried out. ANNOTATION: Spatial Distribution of the Threshold Beam Spots ... |
|
| Optical Properties of Oxide Coatings Prepared by Ion-Assisted Deposition |
08 SEP 93 |
19 pages |
| Authors:
Xuefei Tang; Zhengxiu Fang; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| An investigation was made by changing the preparation parameters, such as different ion species, ion energy, and ion current density, etc., to determine their effects on refractive indices, absorption, and laser-induced damage threshold, etc. of the coatings of TiO2, ZrO2 and SiO2 whose oxide coatings were prepared by ion-assisted deposition. ANNOTATION: Optical Properties of Oxide Coatings Prepared by Ion-Assisted Deposition-- Transalation. |
|
| Two-Dimensional Acousto-Optical Interaction Theory and Experimental Analysis |
06 AUG 93 |
12 pages |
| Authors:
Ren Zhanxiang; Dong Xiaoyi; Zhang Jianzhong; Sheng Qiuqin; Zhao Qida; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| In the paper, the universal coupling wave equation of two-dimensional acousto-optical interaction is theoretically derived. The solution of Raman-Nath diffraction under normal acousto-optical (A-O) interaction is derived. The theoretical results are compared with the experimental results of a two- dimensional A-O device consisting of two one-dimensional Raman-Nath type A-O modulators. These two results are in agreement with each other ANNOTATION: Two-Dimensional Acousto-Optical Interaction Theory and Experimental Analysis -- Translation. ... |
|
| New Algorithm of Ground Track Processing in High-Frequency Skywave Over- the-Horizon-B Radar |
06 AUG 93 |
|
| Authors:
Jiao Peinan; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| Research on Man-Machine Productivity in Aviation at Human Engineering Institute of Hangzhou University |
06 AUG 93 |
14 pages |
| Authors:
Wenxiong Jin; Zuxiang Zhu; Jian Wang; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| The Human Engineering Research Institute of Hangzhou University is a scientific research organization engaged in research on the interdiscipline between psychology and technology. In recent years, ergonomic research on the fundamental theories and applications of man-machine productivity, regarding aircraft instrumentation lighting, displays, and control, warning signals, computer terminal displays, human reliability, human body measurements, as well as management and decision making was carried on. ANNOTATION: Research on Man-Machine Productivity in ... |
|
| Frequency Resolution of an Acousto-Optical Spectrometer |
03 AUG 93 |
16 pages |
| Authors:
Jingsheng Wang; Jianjun Shen; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| The paper discusses the frequency resolution of an acousto-optical spectrometer (AOS) system as affected by the acousto-optical deflector and the coherent light beam truncation ratio, and examines the response of the photodiode array reception system as affected by the AOS frequency resolution. The broadening of the resolution line pattern caused by the response of a photodiode pixel was computed. From this discussion, the authors proposed selection principles for AOS design ... |
|
| Optical Computing |
03 AUG 93 |
15 pages |
| Authors:
Hiroyoshi Yajima; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| The advantage of optical computing is its parallelism. In the case of photography, every part of an object is focused by a camera lens onto a film to construct an image of the object. This image forming process constitutes the basis of optical parallel processing and optical computing is a technology that transforms the concept of optical processing into various information processing techniques. Various research has been conducted in the ... |
|
| Analysis of Health Status from Preliminary Physical Examination of Flight Academy Applicants |
30 JUL 93 |
|
| Authors:
Zhou Zhiying; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| Mathematician Wang Ju |
30 JUL 93 |
|
| Authors:
FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| Tactical Laser Weapons and Other Directed-Energy Weapons |
30 JUL 93 |
|
| Authors:
Wang Rongrui; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| Anisoplanatism in Adaptive Optics |
23 JUL 93 |
|
| Authors:
Yuezhong Feng; Zhiben Gong; Zhengfang Song; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| This paper discusses the influence of the compensatory effect due to the anisoplanatic field in adaptive optics, and proposes a new method, a phase gradient method to reduce the error in anisoplanatism. As shown by analytical results, this method can significantly increase the range of angles for effective calibration; thus, the influence on the anisoplanatic error is greatly reduced. The authors anticipate that the phase gradient method can be expected ... |
|
| Three Short Articles from Japanese 'Laser Journal' |
23 JUL 93 |
|
| Authors:
FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| Experimental Study of Vortex and Aerodynamic Characteristics of Stack Wings with Sideslip |
20 JUL 93 |
15 pages |
| Authors:
Bao Guohua; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| This paper reports on an experimental study of stack wings with small aspect ratio, and describes the variation of detached vortex system at the aircraft wing leading edge with different aspect ratios. The influence on aerodynamic characteristics due to vortex twisting and bursting is analyzed. As revealed in the study, sideslip delays the vortex twisting at the upstream side of the aircraft wing. The vortex bursts early. At the downward ... |
|
| Experimental Study on Interference Aerodynamics of Close-Coupled Canard Configuration |
20 JUL 93 |
|
| Authors:
Guo Yaobin; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| Numerical Solution of SUPG Finite-Element Method for Supersonic Viscous Flow |
20 JUL 93 |
22 pages |
| Authors:
Xu Guoqun; Zhang Guofu; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| A streamline upwind/Petrov-Galerkin (SUPG) weighted residual formalism was developed in the paper for the quasi-simplified Navier-Stokes equations. Numerical computations were made for Burger's equation, the nonviscous shock wave reflection problem, as well as supersonic laminar flow over a flat plate and compression corner flow by using the method. The results of the computations show that this method is accurate, convergent, and stable. ANNOTATION: Numerical Solution of SUPG Finite-Element Method for ... |
|
| Experimental Studies on a Gas Dynamic Laser with Narrow Throat and High Area-Ratio Grid Nozzles |
20 JUL 93 |
14 pages |
| Authors:
FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| This paper describes a combustion-driven CO2 gas dynamic laser with a throat height of 0.3mm and an area-ratio 30 grid nozzles, and presents some experimental results. The behavior of flow and the location of shock waves in the optical cavity were observed. The variation in small-signal gain G (sub o) with CO2 or H2O contents were measured and compared with the experimental data from similar equipment of nozzle throat height ... |
|
| Numerical Solution of SUPG Finite-Element Method for Supersonic Viscous Flow |
20 JUL 93 |
22 pages |
| Authors:
Guoqun Xu; Guofu Zhang; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| A streamline upwind/Petrov-Galerkin (SUPG) weighted residual formalism was developed in the paper for the quasi-simplified Navier-Stokes equations. Numerical computations were made for Burger's equation, the nonviscous shock wave reflection problem, as well as supersonic laminar flow over a flat plate and compression corner flow by using the method. The results of the computations show that this method is accurate, convergent, and stable. ANNOTATION: Numerical Solution of SUPG Finite-Element Method for ... |
|
| Study of High Speed Interference Photography with Two-Dimensional Acousto-Optical Lattice Deflection |
20 JUL 93 |
15 pages |
| Authors:
Anzhi He; Dapeng Yan; Xiaowu Ni; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| This paper presents the principle and method of high speed interference photography by using the technique of two dimensional acousto- optical lattice deflection. The light beam carrying the interferogram is deflected into a lattice of 10x10 light spots in a time series; the interferogram is recorded on a photographic negative. The Cw laser is the light source; the exposure time can be adjusted between 10 -5 to approximately 3x10 -6 ... |
|
| Extracavity Frequency Doubling Study of a Pulsed Photodissociation Iodine Laser |
20 JUL 93 |
9 pages |
| Authors:
Yizhu Sun; Yuqi Jin; Tieji Gui; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| An extra-cavity lithium metaniobate (LiNbO3) crystal and the angle- phase matching technique were used for extracavity frequency doubling investigation of a pulsed photodissociation iodine laser. Frequency doubled laser beam of 0.657 micron wavelength and maximum energy conversion efficiency of 9.6% were obtained. ANNOTATION: Extracavity Frequency Doubling Study of a Pulsed Photodissociation Iodine Laser--Translation. |
|
| Vertical-Tail Aerodynamic Configuration of Space Shuttle Orbiter |
16 JUL 93 |
23 pages |
| Authors:
Zhu Yikun; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| From a discussion of the principle of the vertical-tail aerodynamic configuration of the Space Shuttle Orbiter in the preliminary design stage, and analysis of the vertical-tail aerodynamic configuration (including layout) of the present-day Space Shuttle Orbiter, the author clarified three possible modes of vertical-tail aerodynamic configuration of the Space Shuttle Orbiter, and the principal measures for the lateral-direction aerodynamic characteristics for an improved Space Shuttle Orbiter. These results have direct ... |
|
| The Effect of the Nose Shape and Wing Location Toward the Wing Vortex Breakdown |
16 JUL 93 |
14 pages |
| Authors:
Feng Yanan; Xia Xuejian; Liu Rizhi; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| The variation of the wing vortex breakdown vs. the angle of attack for a missile with a cruciform set of wings was investigated through experiments. The tests were carried out by conducting the flow pattern visualization in the water channel at BUAA. The model had two nose shapes - pointed and blunted nose. The wing was set at fore or aft location along the axis of the body. The experimental ... |
|
| Circular Polarizing Mirrors for High Power Lasers |
16 JUL 93 |
|
| Authors:
Qingming Chen; Fengqing Zhou; Ziaoping Li; Yonggui He; Jinhua Wang; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| The Weapon Research Contract System in China |
16 JUL 93 |
|
| Authors:
Yuen Chou; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| Backfire Bombers in China |
16 JUL 93 |
22 pages |
| Authors:
FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| In this article, the Backfire bomber is briefly introduced and the bomber's most recent developments and current deployment status are reported ANNOTATION: Backfire Bombers in China--Translation. |
|
| Discussion on the Integrated Approach of the CPS/INS and Precision Analysis of the Navigation Performance |
07 JUN 93 |
19 pages |
| Authors:
Jixiang Yu; Gensheng Zhang; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| This paper discusses the advantages and shortfalls of the integration fo two navigation systems, namely GPS and INS. It discusses a method of integrating them by the use of the pseudo range and pseudo range-rate measurements of the GPS-receiver to integrate GPS with INS. Because the measurement errors of the GPS are all different, the numerical simulation of the integrated navigation capability of a plane had to be computed under ... |
|
| Some Superhigh-Frequency and Magnetic Properties of Chemically Precipitated Films |
02 JUN 93 |
|
| Authors:
L. V. Kirenskiy; N. S. Chistyakov; L. A. Chekanova; B. P. Tushkov; G. I. Fish; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
|
| High-Performance Nonlinear Optical Material Developed in Japan |
25 MAY 93 |
6 pages |
| Authors:
Sheng Li; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| As reported by this newspaper based on announcement by the Asahi Glass Corporation of Japan, the world's best performing nonlinear optical material was developed by the Asahi Corporation. The nonlinear three- dimensionality of this new material is 1000 times higher than any known material. This new material is made by spreading fine particles of cuprous chloride (with semiconductor properties) onto a special glass. The fine cuprous chloride particles are only ... |
|
| Coding Objects With the Use of A Dividing Hyperplane for Their Classification |
21 MAY 93 |
19 pages |
| Authors:
Yu. V. Devingtal; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| Methods of object coding are examined, if for their classification a dividing hyperplane is used. Methods of expanding the space of the codes are proposed, if in the initial space distribution by hyperplane is not possible. The obtained code tables, which were obtained, may be used for simple classification of objects without the use of computers. The coding methods indicated were used for the classification of geophysical objects and for ... |
|
| Optimal Coding of Objects When Classifying Them by Methods of Pattern Recognition |
19 MAY 93 |
17 pages |
| Authors:
Yu. V. Devingtal; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| A method is proposed that is the optimal coding of objects in the classification of complex systems. The determination of the codes is reduced to the solution of a problem of linear programming. The obtained table of codes can be used, for example, for determining the oil content of beds from the data of geophysical measurements. The methods of pattern recognition are widely used not only for the identification of ... |
|
| Reactor for Conducting Processes in a 'Fluidized' Bed |
06 MAY 93 |
6 pages |
| Authors:
D. D. Logvinenko; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| Certain reactors for conducting processes in a fluidized bed are made up of a body and housing in which a cooling agent (for example) circulates. The fluidized bed in these devices is created either by means of a gas flowing through a gas-diffusion barrier or mechanically by the rotation of a blade system (or fan), or in a centrifugal force field by creating a certain organization in the rotating flow ... |
|
| The Application of Concentric Vortex Simulation to Calculating the Aerodynamic Characteristics of Bodies of Revolution at High Angles of Attack |
27 APR 93 |
|
| Authors:
Ban Xianlin; Tu Xing; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| The aerodynamic characteristic of sharp nosed bodies of revolution is calculated by using concentric vortex simulation in this paper. Based on the experimental results, an appropriate set of free integration parameters is selected and an empirical relation between initial separation angle and the Reynolds number is established. Thus, the effect of the Reynolds number is reasonably considered in the calculation. The effect of the Mach number is corrected by using ... |
|
| Solution of Euler Equations for Forebody-Inlet Ensemble of Aircraft at High Angle of Attack |
27 APR 93 |
|
| Authors:
Zheng Xiaoqing; Shen Huili; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| A computational procedure was developed to simulate inviscid flows over integrated forebody-inlet ensemble of an aircraft model. The analysis, which includes the effect of Mach number, angle of attack and engine mass flow, is based on the solution of three-dimensional Euler equations. A finite-volume spatial discretization and a Runge-Kutta time stepping scheme are employed in solving the equations. To achieve the required geometric flexibility, a multizone mesh is used. The ... |
|
| Numerical Computation of Inviscid Flow Around Nose Tip of Space Shuttle with NND Scheme |
27 APR 93 |
18 pages |
| Authors:
Ye Youda; Guo Zhiquan; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| The NND scheme presented by Professor Zhang Hanxin of the CARDC has been used in this paper to complete the following computations: the two- dimensional inviscid flow around the symmetric plane of the nose tip of the space shuttle; the three-dimensional inviscid flow around the nose tip of the space shuttle; the three dimensional inviscid flow around the axisymmetric indented body. Under the general coordinate system, the computation grids have ... |
|
Reports by Corporate Author
