氧弹式量热计测定燃烧焓实验操作条件的改进

GR-3500型氧弹式量热计做燃烧焓的测定实验时间长,操作难度大,实验一次性成功率低.通过放宽对实验过程中夹层与量热容器的水温差值要求,实验结果表明夹层水温高于量热容器水温的0.5～3.0℃都是可行的,这样便于学生调节水温,缩短实验时间,取得良好的实验效果.     

Genome-Wide Identification of TaSAUR Gene Family Members in Hexaploid Wheat and Functional Characterization of TaSAUR66-5B in Improving Nitrogen Use Efficiency

Excessive input of nitrogen fertilizer not only causes a great waste of resources but brings about a series of ecological and environmental problems. Although Small Auxin Up-regulated RNAs (SAURs) participate in diverse biological processes, the function of SAURs in the nitrogen starvation response has not been well-studied. Here, we identified 308 TaSAURs in wheat and divided them into 10 subfamilies. The promoter regions of most TaSAURs contain hormone responsive elements, and their expression levels change under the treatment of different hormones, such as IAA, MeJA, and ABA. Interestingly, overexpression of one of the TaSAUR family members, a nitrogen starvation responsive gene, TaSAUR66-5B, can promote the growth of Arabidopsis and wheat roots. In addition, overexpression of TaSAUR66-5B in Arabidopsis up-regulates the expression levels of auxin biosynthesis related genes, suggesting that overexpression TaSAUR66-5B may promote root growth by increasing the biosynthesis of auxin. Furthermore, overexpression of TaSAUR66-5B in wheat can increase the biomass and grain yields of transgenic plants, as well as the nitrogen concentration and accumulation of both shoots and grains, especially under low nitrogen conditions. This study provides important genomic information of the TaSAUR gene family and lays a foundation for elucidating the functions of TaSAURs in improving nitrogen utilization efficiency in wheat.     

抗氧剂1010的晶型分析

利用差示扫描量热分析(DSC)、红外光谱(IR)、粉末X射线衍射(XRD)等手段对抗氧剂1010样品进行了晶体结构分析。不同方法各有特点,分析结果应是几种方法的相互印证与归纳统一。     

透明聚丙烯EP2X32G结晶性能研究

通过差示扫描量热仪和广角X光衍射等分析方法,研究EP2X32G及其基料的结晶性能。结果表明,EP2X32G及其基料中存在α和γ两种晶型。     

原油储罐保温节能计算

联合站内一次沉降罐通常是不保温的,人们主要是从流体的热力条件去考虑,认为一次沉降罐含水较高,不进行保温对沉降效果及原油的流动也没有多大影响。但是如果从能量损耗的角度考虑,一次沉降罐不进行保温既降低了沉降温度,又浪费了燃料。本文通过对大罐的油罐保温与散热量、热平衡及节能分析,得出了对一次罐进行保温是必要的结论。采用的保温层厚度可为40mm和80mm的岩棉和塑料。在设计时应根据实际情况对大罐保温进行计算与效益分析,以达到节能降耗的目的。     

Decode‐and‐forward with full‐duplex relaying

This paper addresses the full‐duplex relaying. Some expressions for outage and average capacity of a two‐hop cooperative system with a full‐duplex relay are derived under an independent but not identically distributed Rayleigh fading environment. Using these expressions, we provide the performance analysis without Monte Carlo simulations. The impact of interference between the relay output and input is investigated. Copyright © 2011 John Wiley & Sons, Ltd.     

VoIP电话的安全问题及防护措施

VoIP电话是综合了传统电信技术与计算机网络技术的一种新型应用。VoIP电话在传输时将信号压缩后封装成IP包，在IP网络上传输，这种传输方式存在着各种安全隐患。讨论了VoIP电话多种可能存在的安全问题，并就这些安全问题作了详细的分析，同时提出了防护措施，以最大限度地保障VoIP电话的安全。     

基于可穿戴传感器数据的人体行为识别数据特征提取方法

随着可穿戴设备的发展与普及,基于可穿戴传感数据进行人体行为检测展现了巨大的研究价值.目前大多人类行为识别工作都是基于视频图像展开的,然而,使用计算机视觉技术进行人类行为识别存在2个挑战:一是很难使参与数据采集的人员在自然状态下采集真实状态下的运动数据,在开展数据采集之前往往需要对参与数据采集的人员进行培训并严格规范其采...     

Electrolyte/Structure?Dependent Cocktail Mediation Enabling High?Rate/Low?Plateau Metal Sulfide Anodes for Sodium Storage

As promising anodes for sodium-ion batteries, metal sulfides ubiquitously suffer from low-rate and high-plateau issues, greatly hindering their application in f...     

Synthesis and characterization of La2Ti2O7 employed for photocatalytic degradation of reactive red 22 dyestuff in aqueous solution

Perovskite structured La₂Ti₂O₇ catalyst prepared by polymerized complex method was characterized and examined the photocatalytic activity by decomposing an azo dyestuff, Reactive Red 22, in aqueous solutions under UV irradiation. La₂Ti₂O₇ powders prepared by polymerized complex method exhibit higher surface areas, better homogeneity and are more sensitive to solution than those prepared by solid-state method. The first derivatives of UV–vis DRS patterns confirmed the complete crystallization of La₂Ti₂O₇ sintered at temperatures higher than 900 °C. The effects of sintering temperature of catalyst and solution pH of photocatalytic reaction were studied. The photocatalytic decomposition of Reactive Red 22 per unit surface area was found to be higher for experiments using La₂Ti₂O₇ than using TiO₂. However, the electron–hole recombination was found to be more obvious for La₂Ti₂O₇ than for TiO₂ because the network of metal cations constructed within La₂Ti₂O₇ enhances the mobility of photogenerated electrons and holes.