Space Engineering University

Xiangbei Welman Pharmaceutical Co., Ltd

Tianyu Sun

Min Hu

Xuyu Wang

Jiuyang Li

Qiang Li

Feifei Li

Ge Zhang

Xianjun Pan

Chaoming Yun

Qinglei Song

Yongjing Ruan

Xueyang Zhang

Provided are a method for maintaining Walker constellation formation and a terminal device. The method comprises: determining a first offset amount of each satellite within a simulation time period according to parameters of a Walker constellation; performing first offset on each satellite according to the first offset amount to obtain a Walker constellation after the first offset; determining a second offset amount of each satellite within the simulation time period according to parameters of the Walker constellation after the first offset; and superimposing the first offset amount and the second offset amount, and performing second offset on each satellite so as to maintain the formation of the Walker constellation.

Method for maintaining walker constellation formation and terminal device

The disclosure describes a low-orbit satellite deorbit control method and system based on a particle swarm algorithm. The method includes: constructing an objective function according to a position parameter and a perturbation acceleration of each of particles in a particle swarm as well as a preset Lagrangian multiplier and a penalty factor; determining an objective fitness of each particle and a population fitness of the particle swarm based on the objective function, updating the position parameter and the velocity of each particle, and obtaining a population optimal fitness at a maximum number of iterations; updating the Lagrangian multiplier and the penalty factor according to the population optimal fitness, comparing the objective deviation value with a preset convergence condition, and determining an objective population fitness and an objective position parameter according to a comparison result to obtain an objective deorbit mode.

Low-orbit satellite deorbit control method and system based on particle swarm algorithm

The present disclosure provides a piperacillin-containing composition, which further containing a certain proportion of ampicillin and sulbactam. The present disclosure further provides a pharmaceutical formulation thereof and the use thereof. The composition and pharmaceutical formulation of the present disclosure can inhibit the drug-resistant, and particularly have therapeutic effects on the infection caused bywhich is resistant to carbapenem or cefoperazone-sulbactam.

Composition containing piperacillin, pharmaceutical formulation thereof and use thereof

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Beijing, China

Tianyu Sun