Beginning with introducing the formulas for calculating the flow area of the grooved ball-chamber of the closed valve bonnet on sucker rod pumps, this article presents the procedure for selecting the main parameters of the chamber: 1.take the valve ball diameter D =0.7D_B-3.6( herein D_B is the pump diameter);
The 270 cases of pneumothorax of communication and tension treated by closed thoracic drainage and cure 221 cases, the average time of pneumothorax return are 8.5±3.5 days.
Utilizing an approximate formula of the first kind zero-order modified Bessel function I 0(x), an approximate closed form of cumulative distribution function(CDF) of a Rice random variable (RRV) is worked out.
The closed form expression of the time domain and power spectrum density has been derived, and the power spectrum has been analyzed for the signal of UWB communication, and the power spectrum of the real signal of UWB communication has been simulated by computer.
This paper deals with the closed form recursive estimation for parameters of almost periodic moving average (APMA) signal using higher order cyclic statistics.
In this paper,making use of the second developing tool of VBA of AutoCAD2002,the CAD system for gear blanks flashless forging is developed, and the methods and technology of AutoCAD2002 second development are studied.
The technological process of new die forging for locking jaw of adjustable wrench was introduced,technology and die construction design of compression forming preforming and flashless precision die forging was explained,and technical economic benefit of new and old technology was compared.
The entire structure of the CAPP system for flashless forging of gear blanks is widely studied from the input of the information, to the establishment of the technologic databases and the development of the user interfaces.
The experimental results indicate that the pump efficiencies of both impellers(closed type: 51%,semi-open type: 47%) were higher than previous designs.
By way of the three-dimensional stress analysis of EC-301 closed type centrifugal turbine disc integral structure the authors have come up with a novel method of integral structure stress analysis for a rotating turbine disc by using general finite element analysis procedures and temperture-treated interference fit.
As an application we produce complete hyperbolic 5-manifolds that are nontrivial plane bundles over closed hyperbolic 3-manifolds and conformally flat 4-manifolds that are nontrivial circle bundles over closed hyperbolic 3-manifolds.
Whenever the action of a maximal torus on the coneCλ* has some nice properties, we obtain simple closed formulas for all weight multiplicities and theirq-analogs in the representationsVnλ,n∈?.
The paper also describes the application of the rigid-viscoplastic finite element code "ALPID," developed by Battelle Labs, Ohio, in developing a hot forging process to produce flashless ring gear blanks.
The metal flow simulations, using ALPID, provide a tool to design and develop die cavities for defect-free closed die forging processes for making flashless ring gear blanks.
The results are given of an experimental investigation of the acoustic method of auto-oscillation suppression in wind tunnels of closed type with open working part.
Experimental investigations of the action of small (20-80 ppm) polymer admixtures on the turbulence structure in the wake behind a grating are performed in a water channel of closed type.
Cleistogamy is a closed type of flowering with ensured self-pollination and an important trait to study evolutionary development in flower organs, reproduction systems, gene flow, and disease control.
闭式
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