Table of Content

20 April 1986, Volume 8 Issue 2

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论文

CARBONIFEROUS SEDIMENTARY FACIES OF LONGHUO，NORTH-WESTERN GUANGXI—A DISSECTION ON AN ANCIENT ISOLATED CARBONATE PLATFORM

Lu Wei-ping Fang Shao-xian

1986, 8(2):  1-13.  DOI: 10.3863/j.issn.1000-2634.1986.02.01

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A small one of series of Palaeozoic carbonate platforms in the joint of Yunnan, Guizhou and Guangxi provinces, Longhuo ancient platform, has been dissected in detail. Carboniferous sedimentary facies of Longhuo area can be divided into three major types; carbonate platform facies, platform margin slope facies arid trough facies. According to space distribution of the sedimentary facies, Longhuo ancient platform was an isolated one, surrounded with troughs in the Carboniferous period, Ancient faulting caused' the palaeomorphologic pattern of platforms alternating with troughs, and were also the palaeotectonic background of Longhuo ancient platform evolution.

A NEW-TYPE TEMPERATURE F IELD MODEL IN A FRACTURE

Xiong Hong-ji Ren Shu-quan

1986, 8(2):  14-19.  DOI: 10.3863/j.issn.1000-2634.1986.02.02

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In hydraulic fracturing and acid fracturing designs，it is necessary to calculate the fluid temperature distribution in a fracture, This paper has developed a fluid temperature field model when leak-off velocity in the wall is constant. It is simpler than Wheeler's and Whitsitt's models(2)(1)，and as accurate as the precise Wheeler's model. It can satisfy the requirements of practical calculations, In this paper are added calculation examples and curves which can be used for reference in practical calculations.

OBSERVATION AND ANALYSIS OF TRACKING THE DESTRUCTIVE PROCEDURE OF MUDPUMP' S PISTON AND INQUIRY INTO FAILURE MECHANISM OF PISTON

Zhou Xi-rong Yang Qi-ming

1986, 8(2):  20-32.  DOI: 10.3863/j.issn.1000-2634.1986.02.03

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In order to study the friction-wear conditions of mud pump'sliner/piston in operation and search out the whole procedure of the occurence and trowth of piston's destructions as well as its failure, the observation of gracking the destructive procedure of two pistons has been made on a test bed developed by ourselves. Some phenomena have been observed which are very useful for prolonging the life of piston, The failure mechanism of piston is also introduced in this paper, The failure of piston is its losing the sealing ability, The failure of piston results from the alternate effect of various destructions under complex operation conditions, The fundamental reasons which affect the life of piston are the sealing ability，the properties of rubber materials and the lubricant state of piston.


STUDY OF THE PLASTIC ZONE SIZE FACTOR OF THE COMPOSITE LAMINATE

Xiao Fang-chun

1986, 8(2):  33-36.  DOI: 10.3863/j.issn.1000-2634.1986.02.04

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After the expression of stress field near the tip of a crack of the k-thlaminated plate of the composite laminate is substituted into Tsai-Hill Criterion，a formula of evaluating the plastic zone size factor near the tip of a crack of, the k-th laminated plate of the composite laminate is obtained in this paper. Hence, its plastic zone size can be determined，which makes it possible to apply Fracture Mechanics Criterion to the composite laminate.

ANALYSIS OF LIMIT CYCLES IN SECOND-ORDER RECURSIVE DIGITAL FILTERS

Yi Zong-fu

1986, 8(2):  37-49.  DOI: 10.3863/j.issn.1000-2634.1986.02.05

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The problems of limit cycles in second-order recursive digital filters with a rounding off quantizer have been studied more systematically in this paper. The properties of limit cycles have been summarized，the distribution regions of various limit cycles on the coefficient planes(β1，β2)have been pointed out, and the linear stability conditions of second-order recursive digital filters have been derived, All conclusions in this paper have been verified by computer simulations.

USING THE OPERATOR SERIES FORMULA TO SOLVE THE MIXED PROBLEM

Wu Xiao-qing

1986, 8(2):  50-64.  DOI: 10.3863/j.issn.1000-2634.1986.02.06

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In references (1) we have discussed Cauchy problem of the equation, and given an operator series formula for solution of the Cauchy problem.The present paper makes use of the operator series formula to solve the mixed problem of the equation on m-dimensional rectangular parallelepiped.

DEMONSTRATION OF GAS STANDING WAVE ON A FLAME RING

Du Jian

1986, 8(2):  65-68.  DOI: 10.3863/j.issn.1000-2634.1986.02.07

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By observing the flame distribution of a burning flame ring, this experiment vividly shows the condition of the two oppositely travelling wave trains which cohere in the space of the ring and form standing waves, The number of wave crests and wave troughs of the flame varies regularly with the change of frequences of incoming Waves.