槽式太阳能集热管热性能评估方法

真空集热管是槽式太阳能聚光集热系统的核心部件之一.集热管工作过程中通过辐射换热、对流换热和热传导的方式将热量传递给环境,这部分传递到环境中的热量称为集热管的热损失.真空集热管的热损失是聚光集热系统热损失或总能量损失的主要组成,在很大程度上决定着聚光集热器的光-热转换效率,因此对集热管热性能的正确评估对聚光集热系统的研究至关重要.本文对槽式太阳能集热管热性能的计算、评估分析方法等进行了分析.     

Proteomic analysis of secretory proteins and vesicles in vascular research

The release of proteins and membrane vesicles in the bloodstream regulates diverse vascular processes, both physiological, such as angiogenesis and haemostasis, and pathological, such as atherosclerosis and atherothrombosis. Proteomics, beside its canonical application for the expression profiling in cells and organs, can be applied to the study of secreted proteins and microvesicles, which play a significant role in the homeostasis of the vasculature, and the development of the atherosclerotic disease.     

New steering mechanism for wheeled mobile robots

Mobile platform has attracted various researches inrobotic applications such as wheelchair, car-like-robotetc. Different categories of omni-directional mobileplatforms have been presented significantly over the last20 years. Their mechanical structures ar…     

Numerical investigation of thermal performance of heat loss of parabolic trough receiver

Based on the analysis of computation methods and heat transfer processes of the parabolic trough receiver running in steady state, a two-dimensional empirical model was developed to investigate the thermal performance of heat loss of parabolic trough receivers under steady state equilibrium. A numerical simulation was conducted for the parabolic trough receiver involved in a literature. Comparisons between numerical and experimental results show that the empirical model is accurate enough and can be used to...     

A 2D and 3D discrete bisector function based on annulus

The bisector function is an important tool for analyzing and filtering Euclidean skeletons. In this paper, we are proposing a new way to compute 2D and 3D discrete bisector function based on annuli. From a continuous point of view, a point that belongs to the medial axis is the center of a maximal ball that hits the background in more than one point. The maximal angle between those points is expected to be high for most of the object points and corresponds to the bisector angle. This logic is not really applicable in the discrete space since we may miss some background points that can lead to small bisector angles. In this work we use annuli to find the background points in order to compute the bisector angle. Our approach offers the possibility to change the thickness of the annulus at a given point and is thus flexible when computing skeletons. Our work can be extended to nD and we propose the nD algorithm.

     

Diabetes mellitus in sub-saharan Africa

The value of total coliforms, faecal coliforms and faecal streptococci in predicting the presence of Salmonella spp. and the numbers of Staphylococcus aureus and Candida albicans in sewage polluted coastal water were assessed. All indicators had strong positive association with Salmonella and moderate positive correlations with Staph. aureus and C. albicans. Total coliforms correlated better with salmonellas and Staph. aureus than did the two faecal groups. Regression analysis revealed that total coliforms have a better value as predictors of the presence of Salmonella and Staph. aureus, while faecal coliforms are better predictors of C. albicans, in moderately polluted areas. The conclusion reached is that enumeration of total coliforms is sufficient to predict the presence of Salmonella spp. or Staph. aureus in sea water moderately affected by sewage pollution, without the additional measurement of faecal coliforms and faecal streptococci.     

槽式太阳能聚光集热技术

详细讨论了槽式太阳能聚光集热技术的最新进展,对不同聚光集热器支撑机构进行了对比分析.结果表明,EUROTROUGH聚光器的支撑机构性能最优.此外,还对抛物面聚光镜和主要的槽式太阳能集热管技术进行了讨论分析.     

Yeast application for desalting fibersol-2

The following study made use of applying brewing yeast Saccharomyces cerevisiae for removing free glucose liberated during enzymatic hydrolysis of the pretreated cornstarch in the preparation of fibersol‐2. The fermentation condition was optimally realized at 20 °C, with 0.5% of yeast for 24 h without total soluble sugars dilution. The glucose removal rate was 98.27%, which is considered acceptable and economical, compared with other removal rates. The recovery of fibersol‐2 was 67.18% and the total dietary fibre content was 94%.