从裙带菜叶、茎中提取褐藻多糖硫酸酯的最佳工艺条件及性质比较研究

采用单因素分析法考察从裙带菜叶、茎中提取褐藻多糖硫酸酯(SP)的最优提取条件,并进行比较分析,结论为:裙带菜叶和茎的最佳提取条件分别为:90℃、6h、80倍加水量、pH=6和90℃、6h、60倍加水量、pH=5,并对叶提和茎提SP进行理化性质研究,结果表明,叶提SP和茎提SP的理化性质相似,其主要性质指标“硫酸根 多糖”含量,茎提SP高于叶提SP,分别为71.8%和61.3%。     

快速标定斜井皮带安装中腰线的方法

本文介绍快速标定斜井皮带安装中腰线标定要素的计算方法及工作步骤。     

One-step foaming method to functional polyurethane absorbents foam

Traditional preparation of superhydrophobic absorbents relies on solvents or further modification with silane. For environmental reasons, it is ideal to find ways that reduce or completely non-solvent. Herein, we show that superhydrophobic sponges can be obtained without solvents by the foaming process. Rough surface morphology and low surface energy were achieved simultaneously during the formation of superhydrophobic foam without further modification. The time required for oil–water separation was shortened significantly, when combined the sponge with a vacuum system. Importantly, the obtained sponge can retain its high oil absorption capacity after several cycles of oil–water separation. The sponge is easy to be scaled up and we have fabricated foams in large scale (37 cm × 30 cm × 22 cm) for making it an ideal candidate for practical application.     

Catalytic partial oxidation of methane to synthesis gas in a ceramic membrane reactor

Methane has been selectively converted to synthesis gas using a two-zone fixed bed of a Ni/Al₂O₃ catalyst inside a modified ceramic membrane. The first zone of the reactor was surrounded by an impervious wall, and therefore behaved as a conventional fixed bed reactor. In the second zone, some of the reaction products could preferentially diffuse out of the reactor, which yielded higher than equilibrium methane conversions. The influence of the different operating conditions has been studied, and the performance of the membrane reactor has been compared to that of a fixed bed reactor. The membrane reactor has also been used at pressures above atmospheric (2 bar), with good conversions and selectivities.     

In Vivo Performance and Structural Relaxation of Biodegradable Bone Implants Made from Mg?Zn?Ca Bulk Metallic Glasses

A study of Mg‐based bulk metallic glasses (BMGs) as biodegradable bone implants is presented. The implantation site can affect performance, so the BMGs were evaluated in vivo in rat femurs using µ‐CT scans at various times for more than 90 days. Estimates of H₂ evolution correlate well with previous in vitro studies and bone–implant contact is similar to that for Ti pins. One potential drawback of Mg‐based BMGs in this application is embrittlement due to structural relaxation. Here, relaxation at 20 and 37 °C is examined, and an increase in the characteristic relaxation time, from 10 to 30 days at 20 °C, is observed as Zn increases from 29 to 32 at.%, correlating with dramatically reduced hydrogen evolution.     

基于SAP5P程序的刚架结构离散变量优化系统

利用优化准则法,结合机械设计的特点,编制了以SAP5P程序为基础的大型复杂刚架结构离散变量优化程序SOP,并对一刚架结构模型进行了优化分析。     

Functional Composite Adsorbents Based on Metal-Organic Frameworks in a Carbon Matrix Applied for Methane Storage

Protection of Metals and Physical Chemistry of Surfaces - In the present work, a method for producing new shaped composite materials by introducing a metal-organic framework structure Cu-BTC110...