A Model Combining Discrete Event System Simulation and Genetic Algorithm for Buffer Allocation in Unreliable Large Production Lines

To solve the difficulties in allocating buffers for unreliable large production lines, this paper inves-tigated a model combining the genetic algorithm with the discrete event system simulation method. In the simulation method, times-to-failure of an unreliable large production line is assumed to follow exponential distribution, whereas times-to-repair and times-to-processing are set to follow an Erlang-k distribution. Using a genetic algorithm based on special position-based mapping means and elitist protection strategy, the buffer configuration of an auto-body welding line is optimized. The simulation of the optimized configuration shows that the performance of the production line, such as productivity and the main average utilization of the workstations, is much improved. This model can optimize the allocation of buffers for unreliable large production lines effectively.

Multi-subpulse process of large time-bandwidth product chirp signal

To prevent the long-time coherent integration and limited range window stumbling blocks of stretch processing and reduce computational complexity, a novel method called multi-subpulse process of large time-bandwidth product linear frequency modulating （ LFM ） signal （ i. e. chirp ） is proposed in this paper. The wideband chirp signal is split up into several compressed subpulses. Then the fast Fourier transform （FFT） is used to reconstruct the high resolution range profile （ HR- RP） in a relative short computation time. For multi-frame, pulse Doppler （PD） process is performed to obtain the two-dimension range-Doppler （R-D） high resolution profile. Simulations and field ex- perimental results show that the proposed method can provide high-quality target profile over a large range window in a short computation time and has the promising potential for long-time coherent in- tegration.

Small Optical Product Breeds Large Industry

China is the world’s largest consumer market for eyeglasses,with the total market volume reaching 80billion yuan.Accordingly,the market has a group of 800 million consumers demanding eyeglasses.The consumers are from different ages。

A LARGE EXQUISITE PRODUCT——OF SUZHOU EMBROIDERY "RETURN JOURNEY"

Alarge exquisite product of Suzhou embroidery—"Return Journey" is a precious gift to the Government of the Hongkong Special Administrative Region from the Jiangsu Provincial People’s Government marking Hongkong’s return.

Heterophase junction engineering-induced Co spin-state modulation of CoSe_(2) for large-current hydrogen evolution reaction

Efficient electrocatalysts are vital to large-current hydrogen production in commercial water splitting for green energy generation.Herein,a novel heterophase engineering strategy is described to produce polymorphic CoSe_(2)electrocatalysts.The composition of the electrocatalysts consisting of both cubic CoSe_(2)(c-CoSe_(2))and orthorhombic CoSe_(2)(o-CoSe_(2))phases can be controlled precisely.Our results demonstrate that junction-induced spin-state modulation of Co atoms enhances the adsorption of intermediates and accelerates charge transfer resulting in superior large-current hydrogen evolution reaction(HER)properties.Specifically,the CoSe_(2)based heterophase catalyst with the optimal c-CoSe_(2)content requires an overpotential of merely 240 mV to achieve 1,000 mA·cm^(-2)as well as a Tafel slope of 50.4 mV·dec^(-1).Furthermore,the electrocatalyst can maintain a large current density of 1,500 mA·cm^(-2)for over 320 h without decay.The results reveal the advantages and potential of heterophase junction engineering pertaining to design and fabrication of low-cost transition metal catalysts for large-current water splitting.

Extraction of Polysaccharides from Spirulina with Boiling Water

[Objective] The aim of this study was to develop a simple and effective method for the polysaccharide extraction from Spirulina. [Method] The polysaccha- rides were directly extracted from the fresh algae mat or dry powder of Spirulina in boiling water. The contents and quality of the extracted polysaccharides were measured. [Result] On average, 236.06 g of polysaccharide was extracted from 25 kg of fresh Spirulina mat, with a yield rate of 0.94%, while 191.95 g of polysac- charide was extracted from 2.5 kg of dry powder of Spirulina with a yield rate of 0.77%. The polysaccharide content in the extract of fresh Spirulina mat was 12.56% （according to glucose content）, while that of the dry powder was 12.38% （according to glucose content）; the glucose was produced during the hydrolysis of Spirulina polysaccharide. [Conclusion] Extraction polysaccharide from Spirulina with boiling wa- ter greatly reduces the use of ethanol, and the possibility of pollution from the ex- ogenous non-food chemical reagents, so that the extracted polysaccharides can be used as food materials. This method makes it possible to establish the production line for Spirulina polysaccharide.

Pressure control strategies in biosafety level-3 large-scale production facilities for animal vaccines

This paper summarized the pressure control methods used in 16 large-scale production facilities in China for vaccines against foot-and-mouth disease virus and highly pathogenic avian influenza virus.We presented the pressure control modes,with their characteristics,of the"constant supply"mode-variable exhaust air volume system and the"constant supply"mode-constant exhaust air volume system.This paper analyzed the influence of common problems(e.g.,pressure reference zero drift,positive pressure reversal and failure to restore the original normal working conditions after working condition conversion)on system stability during pressure control in BSL-3 large-scale production facilities and their solutions,providing references for the design and implementation of similar construction projects under the new situation.

Study on Propagation of Chicken Infectious Bursal Disease Virus on Vero Cells Using Microcarriers in Fermentor

It was in flask optimization tests proved that 2% serum, pH 7.0, 5:10 000 inoculation concentration of infectious bursal disease virus (IBDV) and 108 hours cultivation for IBDV harvest after its inoculation were the optimal conditions when IBDV was propagated on Vero cells. 250 ml self-made spinner bottle and 5 L stirring fermentor tests proved that IBDV could maintain higher liters for a long time and the highest liters of IBDV in a spinner bottle and a fermentor were 8.875 and 8.58 ( - lgTCID50/0.1 ml) respectively when IBDV was proliferated on Vero cells using 2 g/L microcarriers in a spinner bottle and a fermentor and was cultivated under the optimum conditions obtained from flask tests after Vero cells had developed a confluent monolayer on microcarriers, which were at least one titer higher than the highest titer in the traditional rolling bottle. All these results suggested that this technology could be applied to large scale production for IBDV.