ISSN:0253-3839    

DOI:10.1080/02533839.1986.9676897

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

This paper presents an unconditionally stable implicit algorithm for the direct integration of a linear structural dynamic equation of motion. The algorithm is based on two simultaneous difference equations and a weighting factorGfor solving displacement at the next time step. Unconditional stability is proven for the weighting factorGin the range from –0.466 to 0.140 in all undamped and damped cases. The unconditionally stable range ofGcan be extended, from –1.0 to 0.333, for certain types of structure. The amplitude decay and period variation are used as the basic parameters to compare the accuracy of the present algorithm with various other integration methods. A spring‐mass‐dashpot model is applied to illustrate the algorithm for transient and quasi‐static analyses.

ISSN:0253-3839    

DOI:10.1080/02533839.1986.9676898

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A limit equilibrium method is proposed for analyzing progressive failure in the stability of brittle soil slopes. In the proposed method, the failure surface is firstly assumed and the whole failure mass is divided into many vertical slices. By satisfying force and moment equilibrium for each slice as well as for the total mass, the overall factor of safety for the assumed slip surface can be calculated. This factor of safety is then used to check the state of stress along the bottom of each slice. If the state of stress exceeds the soil strength, then local failure occurs and the residual strength is assigned. The whole procedure will be repeated unless the propagation of local failure zone stops. Finally, a more reasonable definition for factor of safety is determined. This analysis is illustrated for well documented case records, and the results are quite consistent with the field observations.

ISSN:0253-3839    

DOI:10.1080/02533839.1986.9676899

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Growth kinetics and cultivation technique ofSpirulina platensiswere studied by using 1 liter Roux‐flask. Optimum temperature and pH forSpirulina platensisunder continuous illumination of white fluorescent light were found to be 30°C and 9.5 respectively. In the logarithmic growth phase, growth followed Monod's equation; the maximum specific growth rate,μm, and saturation constant,KL, were 2.0 day‐1and 9.2 klux respectively. During the linear growth phase, it followed the equation:dX/dt=μmln(1+I0/KL)/ah1, whereI0is the growth limiting factor. Growth yield of the algae ranged 0.01–0.02 g‐cell/kcal. Photosynthesis efficiency ranged 6–12%. Growth was inhibited asPo2in the gaseous phase increased to 95%. An automatic controller for pH of culture medium was devised with the feeding of CO2gas. Such an automatic operation promoted the algae productivity (4.5 g dry wt./l) and also improved the medium utilization.

ISSN:0253-3839    

DOI:10.1080/02533839.1986.9676900

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The objective of this study is to investigate the adsorption of a chlorinated pesticide; lindane, with the presence of humic acid, has been found in a number of surface water supplies. This study includes developing equilibrium data and performing the adsorption column on lindane in the presence of different concentrations of humic acid with different pH conditions. A multicomponent model is used for data synthesis and for simulation and prediction of dynamic performance of carbon beds for removing lindane from the water containing humic acid. The film transfer coefficients (Kf) and surface diffusivities (Ds) used for predictive modeling are determined by micro‐column method.

ISSN:0253-3839    

DOI:10.1080/02533839.1986.9676901

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A systematic method is presented for the preliminary design of a cogeneration system with the desire of achieving minimum operating costs. The ratio of power to process heat is shown to be a critical factor in the preliminary selection of energy conversion systems. However, the final decision should be based on the operating costs and economical index,ROI.A fuel substitution factor is proposed to define theoretically the most economical power generation in plants. Two case studies are demonstrated to describe this approach.

ISSN:0253-3839    

DOI:10.1080/02533839.1986.9676902

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

A new key‐lock‐pair mechanism of access control in information system is proposed. Our method is inspired by Wu and Hwang's result. The most important and common advantages of our method are as follows:1.The memory storage required for keys and locks is small.2.The determination of an access right value is fast.3.The construction of keys and locks is simple.

ISSN:0253-3839    

DOI:10.1080/02533839.1986.9676903

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

In this study, transient ignition on a hot plate is analyzed numerically. In addition to the transient energy and species equations, the transient momentum equation is also considered. A comparison is made between the results of transient velocity field and those of steady velocity field. It is found that the transient velocity field has the effect of increasing the ignition length and ignition time. The effects of wall temperature, Prandtl number and Schmidt number are also studied.

ISSN:0253-3839    

DOI:10.1080/02533839.1986.9676904

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

To solve the difficulty of selecting the hot‐film probe orientation in velocity measurements in aerated or nonaerated stirred tanks, the effects of probe orientation on mean and rms fluctuating velocity measurements were studied and the feasibility of using substituting simplified measurements was investigated.

ISSN:0253-3839    

DOI:10.1080/02533839.1986.9676905

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

This paper is to study the polling of two infinite queues by a synchronous server. Inputs to these queues are correlated and restricted to occur only at equally spaced time instants. For simplicity the walktime for the server to move from one queue to the other is assumed to be zero. Three different service disciplines are considered and compared. They are exhaustive, longer queue first, and priority queue first.

ISSN:0253-3839    

DOI:10.1080/02533839.1986.9676906

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor