颠簸状态下制冷系统气液分离器性能的影响研究

主要针对混合工质两级喷射制冷系统在船舶出海条件下的运行稳定性进行了分析研究。气液分离器是喷射式制冷系统中一个较为重要的设备部件。内部液体的波动与飞溅,容易使得气液分离器出现出气带液的现象,而高压级喷射器引射的出气带液量对整个系统的工作性能会有一定的影响。本文通过数值模拟与试验研究的方法对系统中的气液分离器进行了研究,结果表明,25cm为内部最大安全液位。当分离器内部液位高于25 cm时,气液分离器的出气带液量会随着内部液面高度的上升而增加。另外,在分离器中增设挡板对内部液体的波动与飞溅有明显的抑制作用。

春来喜看贵茶绿

贵州绿意浓,茶香醉宾朋。绿色是贵州最靓的发展底色,散发着业兴民富的时代气息。“让苔茶香飘四方”,是全国人大代表、石阡县龙塘镇大屯村党支部书记周绍军的希望。贵州茶打出生态牌,越打越精彩,茶产业这篇致富经越念越好:茶园面积超750万亩,位居全国之首;产量、产值增幅均名列全国前茅。

A Comparison of Different Gracilariopsis lemaneiformis(Rhodophyta) Parts in Biochemical Characteristics, Protoplast Formation and Regeneration

Gracilariopsis lemaneiformis is a commercially exploited alga. Its filaceous thallus can be divided into three parts, holdfast, middle segment and tip. The growth and branch forming trend and agar content of these three parts were analyzed, respectively, in this study. The results showed that the tip had the highest growth rate and branched most, although it was the last part with branch forming ability. The holdfast formed branches earliest but slowly. Holdfast had the highest agar content. We also assessed the difference in protoplast formation and regeneration among three parts. The middle segment displayed the shortest enzymolysis time and the highest protoplast yield; whereas the tip had the strongest vitality of protoplasts formation. Juvenile plants were only obtained from the protoplasts generated from the tip. These results suggested that the differentiation and function of G. lemaneiformis was different.

Identification of Ni_xS_y on Industrial Spent S Zorb Sorbents by Using XPS and TPR-MS

Three industrial spent S Zorb sorbents extracted from production line were studied with XRD, TPR-MS and XPS. The characterization results of XPS and TPR-MS identified the existence of amorphous Ni_xS_y on industrial spent S Zorb sorbents, while the existing XRD quantitative analysis methods can only provide the long-range order in phase information and the grain size of Ni metal. XPS is a powerful tool to investigate the chemical states of nickel atom and the depthwise distribution of nickel species on S Zorb sorbent. Ni_xS_y and Ni metal species coexist on the industrial spent sorbents, and their percentages to total nickel slightly change with the operating conditions in the surface layer. It proves that Ni_xS_y is a stable intermediate product rather than a transition state. The information can contribute to the better elucidation of S Zorb desulfurization mechanism and offer a new direction for selectivity optimization of industrial S Zorb sorbents.

The Development of Agroecology at Barani （Burkina Faso）

Many researches deal with practices which could adduce reliable answers to insure an ecological development which meets the nowadays global issue ＂feed the world＂ in a sustainable way. But scientific research is much less prolific about social adhesion to those practices. How could we be certain that peasants will integrate them and transform their agriculture？ It is at that particular point that we settled our contribution. Our goal is to determine what are the levers which could be activated to promote agroecological practices, and, on the contrary, what are the obstacles which could prevent social adhesion to agroecology. The meticulous fieldwork carried in Barani, a landlocked small village in the North-West of the Burkina Faso, shows that all the ingredients for the development and the dissemination of agroecology already exist. Indeed, traditional agriculture is not so far from agroecology. But we noticed among peasants ofBarani a rejection of the local farming system synonymous, according to them, with backwardness, and an attraction for industrial agriculture, sign of modernity. Dissemination of agroecology will have to go through a major confidence-building work of the peasants with their own practices, as opposed to multiple trainings where they are always being taught what they already know.

Study on the Adsorption of Metal Ions by Immobilized Marine Algae with the Existence of Clay

The process of adsorption of metal ions by immobilized marine algae with the existence of clay was investigated. It can be noted from the results that, after mixing with clay, the adsorption rate increases rapidly with the increasing amount of the marine algae. When pH=5, the best ratio between the clay and the marine algae is 1:4 for Pb2+. The result of in situ handling of the waste water containing heavy metals shows that the average adsorption rates of heavy metal irons Cu2+, Cd2+, Pb2+ and Ni2+ are all over 70 %.

Gaseous sorption and electrochemical properties of rare-earth hydrogen storage alloys and their representative applications： A review of recent progress

The improvement of hydrogen storage materials is a key issue for storage and delivery of hydrogen energy before its potential can be realized. As hydrogen storage media, rare-earth hydrogen storage materials have been systematically studied in order to improve storage capacity, kinetics, thermodynamics and electrochemical performance. In this review, we focus on recent research progress of gaseous sorption and electrochemical hydrogen storage properties of rare-earth alloys and highlight their commercial applications including hydrogen storage tanks and nickel metal hydride batteries. Furthermore, development trend and prospective of rare-earth hydrogen storage materials are discussed.