Volume 13,Issue 5,1990 Table of Contents

1 I.K. SPECTROSCOPY ANALYSIS OF THE GROUPS IN COAL MACROMOLECULE

1990, 13(5):6-7.

[Abstract](745) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
A set of coal samples are characterized by FT-i.r. spectroscopy, and the assignment of the frequencies observed in coal spectra is analysed and discussed in delail in this paper. At the same time, the law of the variation of the groups in the macromolecule of coal with the increase in the rank of coal is researched.

2 ERRORS AND COMPENSATION OF FORM CUTTING HELICAL

Xiao Dichen Liang Xuehang Zhang Jisheng

1990, 13(5):7-14.

[Abstract](432) [HTML](0) [PDF 341.33 K](944)

Abstract:
A method which uses computer to model the form cutting of helical is presented and quantitatively analysed the errors of the ptofile shape and its position from the deviations of manufacturing and installing of the forming cutter and helical movement of the machine tools are quantitatively analysed, the optimum technique is used to revise the adjustable parameters for compensating the error. It is valuable in engineering application.

3 A MEW HIGH-SPEED METHOD OF TOOL-LIFE TESTING

Yan Xingchun Xiao Shigang

1990, 13(5):15-21.

[Abstract](659) [HTML](0) [PDF 322.67 K](177)

Abstract:
This paper inferred a new high-speed method of tool-life testing from the differential median theorem of the pluralistic function. The characteristic of the method is that by using one cutting edge and doing one wear curve the tool life equation T=Cvx can be obtained.The drain on the workpiece and time of the method decreased by 2/3 as compared with that of the conventional testing method. The test has verified the method in the paper.

4 AN OPTIMIZATION OF THE DIE PROFILE SURFACE FOR THE DEEP- DRAWING PROCESS OF CYLINDRICAI. CUPS WITHOUT A BLANKHOEDER

Wang XinopeiLi Jiren

1990, 13(5):22-26.

[Abstract](422) [HTML](0) [PDF 208.62 K](205)

Abstract:
The die profile on the drawing performance is invrstigaled by the optimization method. The optimization model based on the critical condition of wrinkling is established the optimization solution can avoid the accurrence of wrinkinp; and assure the smallest Fmax and the biggest deep-drawing ratio.

5 THE DECOUPLJNG CALCULATION OF MULTI-AREA POWER SYSTEM LOAD FREQUENCY CONTROL

Ziui JizhongXu Guoyu

1990, 13(5):27-35.

[Abstract](631) [HTML](0) [PDF 366.77 K](151)

Abstract:
The calculating burden of the decoupling judgement of multi-area power system load frequeney centrel is very large by tranditional methods. This paper changcs the decoupling judgement problem into a minimum cost network flow problem. The solution algorithm is out-of-kilter . algorithm which is characterized by simple manipaultion, fast and reliable convergence. In the paper, we discuss and calculate the decoupling problem of two arca power system load frequency control. The results show that the proposed approach is feasible and effective.

6 ANTICIPATED FAIIURE ANALYSIS OF HVAC/DC HYBRID SYSTEMS

Liu Haijun Ren Zhen

1990, 13(5):36-41.

[Abstract](611) [HTML](0) [PDF 269.11 K](153)

Abstract:
A method of anticipated failure analysis(AFA)in HV AC/DC hybrid systems is presented in this paper for the first time. In this method node-injection-power is used to simulate outage states of AC/DC branch circuits, linked with the fast decoupled load flow, to obtain the load flow solutions after the anticipated failures. An example for calculation in this paper shows the effectiveness and correctness of this method and computer programs.

7 ANALYSIS OF THF INFLUENCE OF CHANNEL ON SIGNAL TRANASMISSION IN THE WIRED MWD SYSTEM

Song Junshou Wang Xumin Yan Fengqing

1990, 13(5):42-46.

[Abstract](766) [HTML](0) [PDF 285.32 K](173)

Abstract:
An analysis of the influence of channel on signal transmission in the wired measurcments-while-drilling ( MWD ) system is made. The cases of reflection and refraction to the signal at connecting points of wires are analysed. The transmitting channel must consist of many sections of wires in this measuring system. A few noteworthy practical problems arc put forward when designing this message-transmitting channel.

8 THE PRINCIPLE ANC DESIGN OF VJStOMETER L-2 FOR MEASURING APPARENT VISCOSITY FUNCTION

Cai Shaoxi Yang Xinyi Wu Yunpeng Wang Gongrui Yang Ruifang

1990, 13(5):47-51.

[Abstract](530) [HTML](0) [PDF 288.07 K](146)

Abstract:
A new L-type viscometer,the resuit of the improvement of viscometer L-1, is described. This instrument not only retains the advantage of viscometer L-1 s obtaining the apparent viscosity of non-Newtonian fluid as a function of shear rater covering a certain range by a single test, but can work efficiently when the shea: rate of the specimen is too low for apparent svicosity to be measured with conventional viscometers. Besides, it only needs less than 2mL of specimen for a test.

9 ON FUNCTIONAL OPTIMIZED SIGNAL PROBABILITIES OF PRIMARY INPUTS IN RANDOM TESTING

Xiang Dong

1990, 13(5):52-57.

[Abstract](504) [HTML](0) [PDF 301.37 K](136)

Abstract:
An approach to obtaining optimized signal probabilities of PIS is presented at the functional level. A design for testability is offered to preprocess the Circuit Under Test (CUT). An algorithm to produce Maximal Supergate ( MSG ) is given to reduce a circuit to a tree s e. The computing complexity is decreased, which greatty improves [l].

10 THE THEORETICAL DERIVATION FOR C-M FORMUJA

Sheng Guangmin Gong Shihong

1990, 13(5):58-62.

[Abstract](800) [HTML](0) [PDF 211.54 K](210)

Abstract:
Form the crack propagation rate and the cyclic stress-strain respon- dence of low cycle fatigue, the C-M formula is theoretically derived by using the correcting factor. The constants in this formula are also estimaled and discussed.

11 THE DIRECTING MECHANISM OF V-NOTCHF WITHJN V-NOTCHJNG BLASTING

Yang Youkui Qiu Xiande Zhang Zhicheng

1990, 13(5):68-74.

[Abstract](577) [HTML](0) [PDF 439.93 K](230)

Abstract:
Based on the blasting theory and "Fracture Mechanics " , the directing effect mechanism of V-netch in V-rotching blasting is studied and the positive splitting and directional explanding of crack within V-notching blasting and the priority of crack's expanding in the V-notch axle-plane etc are expounded. It's just these fracture characteristics mentioned above that ensure the fine control of the cracking plane.

12 DESIGN OF THE VENTILATION SYSTEM WITH FANS SPACED IN SERIES

Wang Shiaoli Qian Zhenyong

1990, 13(5):75-82.

[Abstract](611) [HTML](0) [PDF 342.68 K](483)

Abstract:
A method for designing the auxiliary ventilation system for long drivages with multiple fans spaced in series in long duels is proposed based on the criterion that no recirculation takes place between the air flowing in the duct line and the surrounding air, A recurrence method is also given to calculat the leakage and the resistance lose of the duct taking into account of the relationship among the pressure, resistance and the leakage of the duct. The calculating results show that the present method is belter than the other methods.

13 AREA-VECTOR METHOD CALCULATJJNG THE DISPLACEMENTS OF BEAMS AND FRAMES

Hu Guohua

1990, 13(5):83-90.

[Abstract](568) [HTML](0) [PDF 386.52 K](1218)

Abstract:
A new method with which to calculat the displacements of beams and frames is presented. The areas of tending moment diagram of beam or frame and the slope at the origin of the elastic curve are treated as some rotatable vectors with this method. Angular displacement and in-line displacement can be calculated by using the projection and moment of these vectors. This method can be used to calculate displacement of the bar and the bar syttem ( including three dimensional forms. ) , which made from linear or ncnlinear elastic materials. The cross section of the bar is changeable.

14 THE PROGRESS OF SPECTROELLTPSOMETRIC INVESTIGATION FOR ANALYZING ELECTROCHEMICAL REACTIONS

Huang Zongqing Xie Shangfen Zhang Shengtao

1990, 13(5):91-97.

[Abstract](578) [HTML](0) [PDF 444.28 K](1009)

Abstract:
This paper describes the initial idea of building up a new approach of spectroscopic ellipsometry for studying electrochemieal reaction from some of the author's experimental results on ellipsometry. The results which have proved the possibility of this idea is also presented. The study on an odic oxidation of iron and the oxidation and reduction processes of polyaililine film by ellipsometry with different wavelength show that the ellipsometric spectroscopy might be a new method for analyzing electrochemical reactions.

15 A MORE GENEEAL PRODUCTIVE FORCES DISTRIBUTION MODEL WITH ENTROPY CONSTRAINT

He Zonglu Duan Yurong

1990, 13(5):98-105.

[Abstract](523) [HTML](0) [PDF 311.64 K](857)

Abstract:
The productive forces distribution model with entropy constraint is established. it satisfies both the demand with minimization of total cosls and the other demands with optimum distribution at a certain level. The model's regular optimal solution is a gravity molel..

16 CLASS OF CUBIC PARAMETER CURVES

Zhao Xuejun

1990, 13(5):106-111.

[Abstract](571) [HTML](0) [PDF 236.28 K](792)

Abstract:
A class of cubic parameter curves are given. Hermite curve, Ball curve, Bezier curve and Timmer curve are its particular cases. Under certain conditions, this cubic parameter curves have the following properties: Convexity, retaining convex form, contact with the second edge of characteristic polygon and so on. This curve is different from Bezier curve, because its, shape can be changed after its characteristic polygon is given, so its shape can be changed according to our actual requirements.

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