Materials Literature
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BACKGROUND: \nPrimary hyperparathyroidism is a rare disease characterized by excessive secretion of parathyroid hormone from parathyroid adenoma, hyperplasia, or malignancy. The clinical symptoms of the condition are those of hypercalcemia. Although the lesions are commonly located in the neck region, in about 1-2 % o…
Purpose: Gadobutrol 1.0 M is macrocyclic gadolinium-based contrast agent for magnetic resonance imaging (MRI).This multicenter, open-label, phase 3 study aimed to investigate the efficacy and safety of gadobutrol-enhanced versus unenhanced MRI in the visualization and diagnosis of central nervous system (CNS) lesions…
To observe the difference of atomic heights between the Se and Te layers with respect to the Fe layer in FeSe0.4Te0.6 single crystal, a Fe Kα fluorescence X-ray holography (XFH) experiment was performed at room temperature. The crystal structure of superconductor FeSe0.4Te0.6 obtained by X-ray diffraction (XRD) at a l…
ABSTRACT New solder alloys (SAC with microalloying elements such as Ni, Mn and Ti, Sb or Bi) are under evaluation as potential replacements for SAC305 lead free solder. Researchers seek a lead free solder alloy with greater resistance to drop shock that also demonstrates acceptable thermal fatigue resistance. The effe…
ABSTRACT It has been shown in studies that simple SAC based alloys under high delta thermal cycle conditions can be less reliable than traditional tin-lead alloys. This limitation has prevented their widespread adoption for use in high reliability and harsh environments. One approach to overcome this limitation is to…
ABSTRACT The miniaturization trend is driving the industry to adopt low standoff components or components in cavity. The cost reduction pressure is pushing the telecommunications industry to combine component assembly and electromagnetic shields in one single reflow process. As a result, flux outgassing/drying is gett…
ABSTRACT Reliability test methods are performed during the manufacturing design phase to validate process conditions, with a goal to build electronic assemblies that meet reliability and product life objectives. Contract manufacturers (CM) build to the original equipment manufacturers (OEM) cleanliness specification i…
ABSTRACT Technical Presentation: Enhancement of Solder Paste Printing Process Through Cleaning Speaker Bio: Mr. Yeoh Guan Tatt (GT) is a highly experienced technical trainer and speaker with more than 15 years of profound expertise in SMT, semiconductor manufacturing processes, and cleaning applications. He has signif…
ABSTRACT The dissipation of heat from a power die, such as those used to drive the increasingly popular LED arrays, has traditionally been achieved by use of a thermal interface material (TIM) and a metallic heat sink. The performance of this system is usually limited by the capability of the TIM portion of the layers…
研究pH值、温度条件对脱硫脱硫弧菌合成硫化铅纳米产物的影响，并分别用X射线衍射、能谱和高分辨率透射电镜对产物的形貌进行分析. 结果显示，在不同pH值和温度条件下，脱硫脱硫弧菌对铅离子的转化率均在98%以上，pH为7和温度为30 ℃时，铅的转化率达到99.7%. 随着反应体系初始pH值由5增大至8，制得的纳米硫化铅由近球形逐渐转变为杆状颗粒，粒径由10-15 nm逐渐增大至15-30 nm，pH值为9时，制备出了具有特殊形貌单分散的不规则状纳米硫化铅，粒径为10-25 nm. 在15-30 ℃下，温度的改变对产物的形貌以及尺寸大小没有明显影响，制备的纳米硫化铅粒子均呈不规则杆状，粒径大小主要分布在15-30 nm范围内. 铅离子进入…
This specially curated group of 178 titles covers subjects ranging from biodiversity conservation to agriculture and ecology to zoology. Books explore urban ecology, climate change, fire mitigation, and more. These titles are included in the CSIRO Publishing BioSelect Collection.
The experiment will measure the thickness of a thin aluminum foil by sending a beam of x-rays through the foil. The thickness of the foil is related to the difference in the intensity of x-rays that pass through the aluminum window and the initial intensity of the x-ray source. The intensity is also related to a prope…
Cathodic protection (CP) coatings containing sacrificial metal particles have been used for decades. Typically, these coatings require at least 80% sacrificial metal for effectiveness. The discovery of highly conducting allotropes of carbon, such as carbon nanotubes and graphene, has opened new avenues for nanostructu…
After 10 years of normal operation, a hydraulic circulation pipeline of a sub-sea gas production well failed at its bend zone due to internal localized corrosion attack. This appears to be related to crevice corrosion and pitting. These types of localized corrosion have occurred during stagnant or no-flow conditions w…
The various aspects of the 3d-metal nicotinamide complexes chemistry such as synthetic procedures, composition, structure, physicochemical properties, biological activity — have been illustrated in this review.
Summary. The article is devoted to research on the development of a highly efficient pharmaceutical preparation of a new generation of iron-based nanoparticles for prevention and treatment of iron deficiency anemia and anemia of chronic disease. While the modern market of drugs represented a significant arsenal of ant…
An agricultural sector has an actual problem. It means toxicity of diesel engines, and also their high heat density. The main toxic components such as nitrogen oxides and firm particles are typical for diesel engines. The water additive in fuel reduces heat density and toxicity of engines. At water supply in the combu…
The analysis, structural design and constructive sequence of a fixed-dome biodigester built partially underground and using ferrocement as construction material under normal work conditions is in this paper developed. The biodigester capacity is 24 m3 and it is composed by a semispherical dome (cover), cylindricalwall…
The article considers the issues of quality control of tube packing. For determination of the quality level of the packing, printed by flexographic printing a complex method is used. This method allows to identify the most significant parameters, which influence the printing quality. The basic unit parameters are: dot…
An aviation treatment of agricultural and forest lands has advantages as against at-ground one on productivity, opportunity to cultivate a field with the humidified soil, to lack of mechanical damages of plants. The authors proved expediency of use of a light aircraft for chemical operations. A gyroplan is perspective…