Removal of carbonyl sulfide from CO2 stream using AgNO3-modified NaZSM-5

Removal of carbonyl sulfide (COS) from CO₂ stream is significant for the production and utilization of food grade CO₂. This study investigates the adsorption performance of Ag/NaZSM-5 as adsorbent prepared by incipient wetness impregnation for the removal of COS from a CO₂ stream in a fixed-bed adsorption apparatus. Effects of various conditions on the preparation of adsorbent, adsorption and desorption were intensively examined. The results revealed that COS can be removed to below 1×10^?9 from a CO₂ stream (1000 ppm COS/CO₂) using Ag/NaZSM-5 (10 wt% AgNO₃) with an adsorption capacity of 12.86 mg-g^?1. The adsorbent can be fully regenerated using hot air at 450 °C. The adsorption ability remained stable even after eight cycles of regeneration.     

Designer Self-Assembling Peptide Materials for Diverse Applications

Summary: Macromolecuar chemistry and polymer science have had an enormous impact in many areas of science, engineering, medicine and our daily life. It has not only changed our way of life forever, but also continuously to improve our living standard. Macromolecuar chemistry now also encompasses bioengineering, biomimetics, designer biological materials and nanobiotechnology. Here we summarize a few classes of short peptides that we discovered and invented with broad applications including 3D tissue cell culture, reparative and regenerative medicine, tissue engineering, slow drug release, stabilization of membrane proteins for develop nanobiotechnology and molecular devices. Molecular design using short peptides as new materials will play increasingly important role in biomedical research, nanobiotechnology, clinical science and medicine.     

单功能基叔胺型弱碱树脂的合成及其滴定曲线研究

合成了以苯乙烯－二乙烯苯为骨架的若干叔胺型弱碱性树脂，研究了胺化反应条件，胺化试剂及交联度等对叔胺产碱树脂功能单一性的影响，测定了强碱交换量低的叔胺树脂的滴定曲线特征，找到了适合作为热再生树脂弱碱组分的单功能基叔胺树脂的合成条件。     

丁酸钠预培养对水稻花药绿苗形成的影响

对水稻花药进行了丁酸钠预培养的试验,结果表明:2mM丁酸钠24小时的预处理,可以促进小孢子的均等分裂,增加多核花粉的比例,并影响愈伤组织诱导率和愈伤组织的分化绿苗潜力,对愈伤组织分化绿苗的促进作用尤其显著。丁酸钠对愈伤组织诱导的作用,与介质的pH的值有关,pH7.0的培养基的诱导率低于pH5.8,但对分化有利。 文章讨论了丁酸钠促进愈防组织分化的可能原因,以及丁酸钠影响愈伤组织诱导和促进分化之间关系。     

Polyurethane vascular prostheses in pigs

Microporous, compliant vascular prostheses made from segmented polyurethanes of various molecular stability, have been implanted in the infrarenal aorta of young pigs. Prostheses prepared from a hydrolytically suble polyetherurethane showed a limited patency up to 1 month. Composite prostheses with the wall made from a hydrolytically stable polyurethane and the lumen side prepared from a degradable polyurethane, were patent up to one year. A degradable layer of this composite prosthesis induced the growth of a neo-artery. Prostheses prepared from a degradable polyurethane alone, were substituted within 4 months with a functional neo-artery.Presented in part at the 17th International Biomaterials Symposium, San Diego, California, April 1985.     

Multi-function Device Based on Two Terahertz Optical Asymmetric Demutiplexers

A multi-function device based on two terahertz optical asymmetric demultiplexers (TOAD) is proposed,which can be used simultaneously as demultiplexing,data regeneration,clock recovery and wavelength conversion unit. The device can work at an ultra-high speed optical time-division multiplexing (OTDM) system with relatively low speed components.     

All-optical regeneration of DQPSK/QPSK signals based on phase-sensitive amplification

An all-optical regeneration scheme for DQPSK and QPSK signals using phase-sensitive amplifiers (PSAs) is studied and its effectiveness is investigated through numerical simulations. By leveraging the ability of PSAs to provide phase and amplitude regenerative amplification, we show significant simultaneous suppression of both phase and amplitude noises of (D)QPSK signals under optimized conditions. The reduction in the phase noise variance of a noise-corrupted DQPSK signal obtained by one such regenerative amplification can be as large as ∼5.5 folds, showing its good potential for distributed optical regeneration of (D)QPSK signals.     

时隙交织信道的四波混频均衡再生

给出了适用于多波长再生的数据抽运简并四波混频(FWM)耦合模方程组,提出了时隙交织波长信道再生的准相位匹配均衡方法。从优化设计简并FWM相位失配因子入手,针对实验室已有的光纤,实现了4个固定波长信道的均衡再生;通过设计光纤参数,在一定带宽范围内可实现任意4个波长的均衡再生。计算结果表明,再生输出信号的脉冲峰值功率、消光比(ER)和Q值之间的差异分别不超过0.25dB、0.42dB和1.5。     

Sorption-enhanced steam reforming of hydrocarbons with autothermal sorbent regeneration in a moving heat wave of a catalytic combustion reaction

A novel technological concept of sorption-enhanced steam reforming of hydrocarbons is suggested. The peculiarity of the concept is the autothermal regeneration of the carbon dioxide scavenger in the moving super-adiabatic heat wave of an exothermic catalytic combustion reaction performed directly inside the adsorption-catalytic bed. The capability and high efficiency of the proposed technological approach are confirmed by process simulation. The approach proposed is shown to open a way for the creation of an inexpensive, reliable and energy-saving adiabatic packed bed methane processors of unlimited processing capacity.     

PLANT REGENERATION FROM IMMATURE COTYLEDONOUS TISSUE CULTURES OF SOYBEAN BY SOMATIC EMBRYOGENESIS

Genetic engineering of soybean is limited because of the difficulty of regeneration of plants via in vitro culture. Here we report that a method of obtaining somatic embryos and regenerated plants of soybean has been developed. It is achieved by culturing immature cotyledons of soybean on modified Murashige-Skoog medium supplemented with high concentration of either napthalene acetic acid (NAA) or 2,4-dichlorophenoxyacetic acid (2,4-D). High induction frequencies of 85% and 94% are reached by using 10mg/l NAA and 5mg/l 2,4-D, respectively. A number of regenerated plantlets of soybean are transplanted to sterilized soil and grown into 15 full plants in pots.