批发城生意平淡 四驱车消费首选

每年7月中旬，各地的学生虽然都已开始放暑假，可是玩具生意却一直比较平淡。据哈尔滨玩具批发城的大洋模型玩具有限公司于总介绍：每年这个时候天气较热且学生刚放假都是先在家里休息，以致生意都不如前一两个月。     

A new sorbent that simultaneously sequesters multiple classes ofpollutants from water: Surfactant modified zeolite

A zeolite (ZFA) was synthesized from coal fly ash and then modified using hexadecyltrimethylammonium. The surfactant modified ZFA (SMZFA) was evaluated for its versatility to sequester multiple classes of pollutants from water. The target pollutants include ionic inorganic pollutants (ammonium and phosphate), ionic organic pollutants (methylene blue and humic acid), ionizable organic pollutants (bisphenol A,-chlorophenol and phenol, with different pKa), and electrically neutral or-ganic pollutants (aniline, nitrobenzene, and naphthalene, with different hydrophobicity). The SMZFA showed high potential for the retention of ammonium and phosphate, being comparable with ZFA. While the negative charge in the internal pores of zeolite was responsible for the retention of ammonium, the oxides of CaO, Al2O3and Fe2O3in the non-zeolite fraction, which originated from coal fly ash but received modification during zeolite synthesis, accounted for the removal of phosphate. Results also showed that while ZFA had little affinity for humic acid, the ionizable, and the electrically neutral organic compounds, SMZFA exhibited greatly enhanced adsorption capacity. Thus, the surfactant modified external surface, which formed a bilayer micelle of zeolite, imparts a hydrophobic characteristic that enables the uptake of the organic pollutants. We showed that SMZFA is a promising versatile sorbent for water treatment.     

Barley leaves mediated biosynthesis of Au nanomaterials as a potential contrast agent for computed tomography imaging

Science China Technological Sciences - Over the past few years, environment-friendly green synthetic methods for metal nanoparticles (NPs) have received considerable attention. The use of plant...     

改革财务管理体制实行会计集中核算

黄河水利委员会河南黄河河务局为进一步加强局属各单位财务管理、规范会计核算、确保会计信息质量，提高全局资金调度和调控能力，在2002年实行会计委派制度以后，又进行了一次重大财务管理体制改革，即推行会计集中核算。2008年4月，河南黄河河务局会计核算中心正式挂牌成立，标志着会计集中核算工作全面展开。     

高速电主轴轴承热分析与实验研究

根据高速电主轴角接触球轴承中滚动体的运动情况,分析其受力状态,并考虑轴承预加载荷对滚动体在高速旋转状态下陀螺力矩的平衡效果,应用Palmgren经验公式计算轴承整体的摩擦热,然后依据传热学理论建立轴承的温升热模型,并用热网络法建立其热阻抗网络图,最后用120MD60Y6油雾润滑型电主轴的轴承进行试验验证.结果表明,轴承温升主要受转速、润滑油量、供气压力及载荷的影响,在主轴启动的初始阶段温升变化最快,且润滑油量和供气压力对轴承温升有一个最佳的适用范围.     

Highly sensitive detection of HER2 extracellular domain in the serum of breast cancer patients by piezoelectric microcantilevers

Rapid and sensitive detection of serum tumor biomarkers are needed to monitor cancer patients for disease progression. Highly sensitive piezoelectric microcantilever sensors (PEMS) offer an attractive tool for biomarker detection; however, their utility in the complex environment encountered in serum has yet to be determined. As a proof of concept, we have functionalized PEMS with antibodies that specifically bind to HER2, a biomarker (antigen) that is commonly overexpressed in the blood of breast cancer patients. The function and sensitivity of these anti-HER2 PEMS biosensors was initially assessed using recombinant HER2 spiked into human serum. Their ability to detect native HER2 present in the serum of breast cancer patients was then determined. We have found that the anti-HER2 PEMS were able to accurately detect both recombinant and naturally occurring HER2 at clinically relevant levels (>2 ng/mL). This indicates that PEMS-based biosensors provide a potentially effective tool for biomarker detection.     

荧光相关光谱的原理、技术及应用

本文介绍荧光相关光谱的原理、技术以及其在生命科学和化学领域内的应用。     

基于Android的3D视频播放器

随着科学技术的不断进步,传统的2D显示已经不能完全满足人们对视频透视感和环绕感的需求,3D应用越来越广泛。现今Android作为主流的平板和手机的操作系统为人们所使用,在Android系统上提供3D应用将是不错的选择。本文首先详细介绍2D图像转化为3D图像的基本原理,然后介绍基于Android的3D视频播放器模块的实现。经验证,本文提供的基于Android的3D视频播放器可以较高效的进行2D视频转化为3D视频并播放。     

Novel SFS-NDT in the field of defect detection

NDT plays a crucial role in everyday life and is necessary to assure safety and reliability. NDT applied to surface detection as far as possible should be a non-contacting technique operating easily with low inspection costs and a high accuracy, human beings as inspectors as well as the environment should not be harmed. A novel NDT based on Shape From Shading (SFS) is introduced in this paper. SFS is a prospecting 3D recovery method because it recovers 3D shape of work piece only from one image. We firstly use SFS in the field of 3D surface defect detection, which is an effective way to guarantee the product quality. Compared with other defect detection method, this SFS method only needs CCD, optical system, image-collection card and computer. It has the merits such as low cost, easy operation, non-contact, non-destructive, no harming to people, and it is 3D overall shape detection. SFS-NDT has been used in the online defect detection measurement of TianJin SanHuan new material Ltd in Chinese Academy of Science. The 3D shape recovery method and application in the field of defect detection are presented. The precision of 3D recovery is analyzed.     

On orbit estimation of spacecraft dynamic property

Mass property of spacecraft needs to be estimated in certain circumstances.Based on the measurement of single point acceleration,angular acceleration and angular velocity,a discrete Kalman Filter(KF) based estimation method is developed to extract the inertia matrix and mass center.The simulation results show that the method can be used for continues online estimation without propellant consumption.Stability condition for the filter is given at last.