Content Comparison of Three Kinds of Flavonoids in Powders of Tartary Buckwheat of Different Parts

The contents of rutin,quercetin and kaempferol in powders of tartary buckwheat of different parts were determined by high-performance liquid chromatography( HPLC). The results showed that the contents of the three kinds of flavonoids differed greatly in the powders of tartary buckwheat of different parts. The contents of rutin and quercetin in the powder of tartary buckwheat sprouts were significantly higher than those in the powders of tartary buckwheat leaves and seeds. The content of kaempferol was highest in the powder of tartary buckwheat seeds. It indicates that high-performance liquid chromatography can be used for quality control of tartary buckwheat powder for its time saving,cost saving and accurate and reliable results. The content of rutin in the powder of tartary buckwheat sprouts was highest,suggesting that it is more suitable for the development of various foods based on tartary buckwheat powder.

Study on frictional behavior of SiC_(f)/SiC composite clad tube clamping condition under nuclear irradiation

Silicon carbide fiber reinforced silicon carbide matrix(SiC_(f)/SiC)composite is the key cladding material of nuclear fuel,which determines the safety and reliability of nuclear fuel storage and transportation.The replacement of its storage and transportation scenario needs to be completed by the manipulator,but the application of SiC_(f)/SiC wear,fracture,and nuclear leakage in the snatching process of brittle-flexible-rigid contact in the irradiation environment has been seriously restricted due to unclear understanding of the damage mechanism.Therefore,the effects of irradiation dose and clamping load on the friction characteristics of the contact interface between SiC_(f)/SiC clad tube are studied in this paper,and the effects of irradiation parameters and clamping force on the static friction coefficient of the contact interface between the clad tube and flexible nitrile are obtained.Based on the Greenwood-Williamson tribological model,a numerical model of the shape and structure of the contact micro-convex at the micro-scale of the clamping interface is constructed by introducing the multi-surface integral,and finally verified by experiments.The research results show that there is a unique“Irradiation suppression zone”under the clamping condition of SiC_(f)/SiC cladding tube under the nuclear irradiation environment,and the growth of static friction coefficient slows down until stagnates after irradiation reaches a certain extent(600 kGy),and there will be a decline when the irradiation dose continues to increase,among which the clamping force of 15.2 N within the irradiation interval of 1,000 kGy can meet the safety of nuclear environment operation.The results of this paper can provide an important theoretical basis and application guidance for the safe operation of SiC_(f)/SiC cladding tubes in the storage and transportation clamping process.

儿童眼及视力保健信息化系统的创建与应用

目的：探索儿童眼及视力保健的信息化管理方法，介绍湖州市儿童眼及视力保健信息化系统的创建及应用情况。方法：以《儿童眼及视力保健技术规范》为蓝本，在儿童保健信息管理系统中增加儿童眼及视力保健信息管理模块，并建立数据库，通过市、县、乡三级儿童保健服务网络，实时收集、监测并管理儿童眼及视力保健信息。结果：儿童眼保健信息系统创建后，经在市、县、乡9个适宜技术单位试点应用基础上，逐步以点连线向全市112 个工作站点推广覆盖，录入系统信息4 千条，提高了本地区儿童眼保健服务质量与儿童眼病筛查率，有利于儿童眼保健档案建立，实现对儿童眼病现况的统计、分析。结论：儿童眼及视力保健信息化提高了儿童眼保健管理平，能为决策层决策提供全面的科学依据，是儿童保健事业发展的必然趋势。

Surface effects of liquid metal amoeba

Liquid metals(LM) such as eutectic gallium-indium and gallium-indium-tin are important functional liquid-state metal materials with many unique properties, which have attracted wide attentions especially from soft robot area. Recently the amoeba-like transformations of LM on the graphite surface are discovered, which present a promising future for the design and assemble of self-fueled actuators with dendritically deformable body. It appears that the surface tension of the LM can be significantly reduced when it contacts graphite surface in alkaline solution. Clearly, the specific surface should play a vital role in inducing these intriguing behaviors, which is valuable and inspiring in soft robot design. However, the information regarding varied materials functions underlying these behaviors remains unknown. To explore the generalized effects of surface materials in those intriguing behavior, several materials including glass, graphite, nickel and copper oxides(CuO) were comparatively investigated as substrate surfaces.Important results were obtained that only LM amoeba transformations were observed on graphite and CuO surfaces. In order to identify the proper surface condition for LM transformation, the intrinsic properties of substrate surfaces, such as the surface charge and roughness, as well as the specific interaction with LM like wetting behavior and mutual locomotion etc., were characterized. The integrated results revealed that LM droplet appears more likely to deform on surfaces with higher positive surface charge density, higher roughness and less bubble generation on them. In addition, another surface material,CuOx, is identified to own similar ability to graphite, which is valuable in achieving amoeba-like transformation. Moreover, this study offers a fundamental understanding of the surface properties in realizing LM amoeba transformations, which would shed light on packing and structure design of liquid metal-based soft device within multi-material system.

Low Melting Temperature Liquid Metals and Their Impacts on Physical Chemistry

Low-melting-temperature(LMT)metals and alloys based on post-transition metals,frequently dubbed as“liquid metals”,are enigmatic materials.Although they have been around for thousands of years,and we have continuously been fascinated by what they are,our knowledge about them is still rudimentary.Perhaps the reason is that most electromagnetic waves or even electron beams can hardly penetrate through liquid metals and we tend to ignore what we cannot directly observe.