Average absorption coefficients and mean free paths of radiation of the continuous spectrum in the region of multiple and total ionization

Consideration is given to problems of averaging absorption coefficients of atoms and multiply charged ions with passage to the region of total ionization. It is shown that correct allowance for ionization of hydrogen-like ions makes it possible to pass automatically to coefficients of absorption in the continuous spectrum. A comparison is made with detailed calculations of mean free paths for a number of elements.     

Ion-Beam Deposition of Thin AlN Films on Al2O3 Substrate

Technical Physics Letters - Thin aluminum nitride (AlN) films on sapphire (Al2O3) substrates were grown by means of ion-beam deposition (IBD) and studied by methods of scanning electron microscopy,...     

Chemical processes in the earth’s atmosphere disturbed by volcanic ejection

The dynamics of formation of a stratospheric aerosol is traced on the basis of a one-dimensional photochemical model of a horizontally homogeneous atmosphere allowing for only vertical transfer of impurities. Calculations show that below 30 km sulfur is mainly in the form of CSO, whereas at higher altitudes it is in the form of sulfuric acid.     

Toward clinical proteomics on a next-generation sequencing platform

We report the first next generation sequencing (NGS) application to identify and quantify proteins. Customization of protein specific aptamers enabled direct conversion of serum protein information into NGS read outs. The intrinsic ability of aptamer sequencing to highly multiplex protein detection and quantification, together with the prospect of DNA sequencing further evolving into a commodity technology, could constitute the core of a novel, universal diagnostics paradigm.     

Electrical Properties of Beryllium-Doped Gd2Zr2O7

Inorganic Materials - Dense Gd2Zr2O7-based ceramics with the composition Gd2Zr1.9Be0.1O6.9, containing heterovalently substituted beryllium on the zirconium site, have been prepared for the first...     

Improving strength, drying shrinkage, and pore structure of concrete using metakaolin

This paper presents the results of an investigation on the use of metakaolin (MK) as a supplementary cementing material to improve the performance of concrete. Two MK replacement levels were employed in the study: 10% and 20% by weight of the Portland cement used. Plain and PC-MK concretes were designed at two water–cementitious materials (w/cm) ratios of 0.35 and 0.55. The performance characteristics of the concretes were evaluated by measuring compressive and splitting tensile strengths, water absorption, drying shrinkage, and weight loss due to the corresponding drying. The porosity and pore size distribution of the concretes were also examined by using mercury intrusion porosimetry (MIP). Tests were conducted at different ages up to 120 days. The results revealed that the inclusion of MK remarkably reduced the drying shrinkage strain, but increased the strengths of the concretes in varying magnitudes, depending mainly on the replacement level of MK, w/cm ratio, and age of testing. It was also found that the ultrafine MK enhanced substantially the pore structure of the concretes and reduced the content of the harmful large pores, hence made concrete more impervious, especially at a replacement level of 20%.     

飞翔酒店

状态:完成;地点:Dubai;建筑面积: 40 210 m2;预算:1．1百万欧元;日期:2004。 1 欢庆飞翔之乐趣鹿特丹的ONL建筑设计公司提出了飞翔酒店的设计概念,这一设计概念被柏林的玛玛迪室内设计公司采纳。与玛玛迪合作,ONL更加     

Methodology of evaluating the influence of the resistance of contact regions in the measurements of sheet resistance on stripes of ultrathin high-resistance materials

The paper reviews the problems of measurement of sheet resistance of ultrathin high-resistance layers of organic semiconductors and the essential underlying problems. Particular attention is paid to potential influence of the resistance of contact regions on the results of direct measurement of sheet resistance of stripe-shaped layers. In this connection, we present a methodology of double length stripe resistance measurement (DLSRM), used above all to minimise the influence of contact regions on the measurement results. We deduce theoretical as well as practical possibilities of DLSRM in the diagnostics and quantitative characterisation of unsuitable or even faulty contacts on high-resistance layers. The application efficiency of the DLSRM method is documented by the results of sheet resistance measurement on zinc phthalocyanine with cathode sputtered planar contacts of noble metals (gold, platinum, or palladium). As expected, gold is the best contact material, but even in its application one cannot neglect the influence of contact regions. The presented method is universal and generally applicable to all materials where sheet resistance is the relevant parameter, and its assessment is based on measurements of the layer resistance in stripe arrangement.