鲢和鳙单倍体和二倍体单个囊胚的细胞培养

对鲢、鳙单倍体和二倍体单个囊胚胚胎进行培养,结果表明,单倍体和二倍体细胞对培养条件的要求相差不大,其原代培养细胞的生长特点表现为新生细胞主要沿着组织块边缘重叠生长,向外扩展生长的速度非常缓慢,二倍体的鲢和鳙胚胎细胞培养物成活率相对高于单倍体,其中鲢二倍体胚胎细胞传代细胞占细胞培养数的18.06％。本结果对深入开展鲢、鳙核移植及胚胎干细胞研究具有积极意义。

BWR fuel design options for self-sustainable Th-233U fuel cycle

In this work, we investigate a number of fuel assembly design options for a BWR core operating in a closed self-sustainable Th-233U fuel cycle. The designs rely on axially heterogeneous fuel assembly structure in order to improve fertile to fissile conversion ratio. One of the main assumptions of the current study was to restrict the fuel assembly geometry to a single axial fissile zone "sandwiched" between two fertile blanket zones. The main objective was to study the effect of the most important design parameters, such as dimensions of fissile and fertile zones and average void fraction, on the net breeding of 233U. The main design challenge in this respect is that the fuel breeding potential is at odds with axial power peaking and therefore limits the maximum achievable core power rating. The calculations were performed with BGCore system, which consists of MCNP code coupled with fuel depletion and thermo-hydraulic feedback modules. A single 3-dimensional fuel assembly with reflective radial boundaries was modeled applying simplified restrictions on maximum central line fuel temperature and Critical Power Ratio. It was found that axially heterogeneous fuel assembly design with single fissile zone can potentially achieve net breeding. In this case however, the achievable core power density is roughly one third of the reference BWR core.

Isolation and characterization of microsatellites in Chinese soft-shelled turtle, Pelodiscus sinensis

Fifteen polymorphic microsatellite loci were developed for the Chinese soft-shelled turtle (Pelodiscus sinensis) from the (GT)(n) microsatellite-enriched genomic library, using the fast isolation by amplified fragment length polymorphism of sequences containing repeats protocol. The polymorphism of all 15 loci ranged from two to seven alleles with observed heterozygosities ranging from 0.03 to 0.98 (mean 0.43) in one population of 40 individuals. These novel loci will be helpful for understanding the population structure at genetic level and marker-assisted breeding of this vulnerable species.

A novel extremely broadband superluminescent diode based on symmetric graded tensile-strained bulk InGaAs

A novel broadband superluminescent diode (SLD), which has a symmetric graded tensile-strained bulk InGaAs active region, is developed. The symmetric-graded tensile-strained bulk InGaAs is achieved by changing the group III TMGa source flow only during its growth process by low-pressure metalorganic vapor-phase epitaxy (LP-MOVPE), in which the much different tensile strain is introduced simultaneously. At 200mA injection current, the full width at half maximum (FWHM) of the emission spectrum of the SLID can be up to 122nm, covering the range of 1508-1630nm, and the output power is 11.5mW.

有线普适视频的分子化模型研究

普适计算是“后PC”时代的产物 ,正在深刻地影响着计算机科学的许多方面 针对有线普适视频领域 ,从“分子化合”的思维角度出发 ,提出了分子化服务思想 ,并构建了分子化服务体系结构模型 ,继而提出了保证视频服务分子协同工作的差错控制算法 实验证明这一差错控制算法是有效的 ,基于分子化服务思想的有线普适视频服务模型也是可行的 ,并且能够有效降低普适设备的系统负载 .

脉冲管制冷机

本文主要介绍正在盛行研究的脉冲管制冷机的原理、结构、现状以及应用前景

我国热泵技术研究现状及应用发展

本文概述了我国热泵技术－电动压缩式、热驱动吸收式和电、热驱动相结合的吸收压缩复合式热泵的研究现状和应用情况，指出存在的问题以及以后发展方向，技术政策。