Materials Literature
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Steam reforming of n-hexadecane, a major component of diesel over Ni-based hydrotalcite-like catalyst was carried out at at atmospheric pressure with space velocity of and feed molar ratio of steam/carbon=3.0. Ni-based hydrotalcite catalyst was prepared by a solid phase crystallization (spc) method and characterized b…
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010.
Diatoms are eukaryotic unicellular algae with cell walls composed of intricate ornate silica particles. Conventional methods of making silica structures involve high temperatures, pressures, and pH in contrast to biosilicification in living organisms that proceeds under physiological conditions. Biosilicification unde…
“理想变压器”是电磁感应现象的一个典型应用，是该部分知识的提高和升华，它与电路、电磁场、电磁波联系紧密，在实际生活和生产中有着广泛的应用．《课程标准》规定：能尝试运用有关的物理知识和技能解释一些自然现象和生活中的问题；能运用物理原理和研究方法解决一些与生产和生活相关的实际问题；
This work was focused on the processing and characterization of thin (200–300 nm) film La0.6Sr0.4Co0.2Fe 0.8O3-δ-Ce0.8Gd0.2O2-δ (LSCF-CGO) composite cathodes to achieve low polarization resistances at reduced temperature (300–600°C). A single precursor solution was employed to process the LSCF-CGO films by spray pyrol…
China Demonstration Fast Reactor(CDFR) was chosen for the reference core of ADS sub-critical fast reactor,mainly studying on the feasible of transmutation minor actinides from the spent fuel of PWR(U).The design of CDFR referred to the BN-800 which is on construction of Russia.In the sub-critical fast reactor core,the…
Besi cor adalah paduan besi yang mengandung karbon, silisium, mangan, fosfor dan belerang. Besi cor ini digolongkan menjadi enam macam yaitu : besi cor kelabu, besi cor kelas tinggi, besi cor kelabu paduan, besi cor bergrafit bulat, besi cor mampu tempa dan besi cor cil. Salah satu bahan dari blok rem kereta api adala…
Cretaceous charophytes and Palaeocene larger foraminifera are facies-linked microfossils used to perform \nbiostratigraphic correlation between distant basins, in Eurasia (charophytes) or the whole Tethys (larger \nforaminifera). The capability of these organisms for dispersal and colonization is analysed and appears…
以浸锌-闪镀法和预植法分别对铝合金基体进行前处理，然后再化学镀Ni-Cu—P合金。通过扫描电镜（SEM）、能谱仪（EDS）和电化学测量等技术对其进行表征，探讨了两种前处理工艺对化学镀Ni-Cu-p合金镀层表面形貌、化学组成和阳极极化曲线的影响。结果表明，与浸锌-闪镀法相比，预植法工艺简单，得到的镀层与基体结合良好；两种镀层的Ni含量相近，均为68％，但预植法所得镀层的Cu含量比浸锌-闪镀法增加近7个百分点，P含量则下降6个百分点；预植法所得镀层的腐蚀电流密度为3．8μA／cm2，远小于浸锌-闪镀法所得镀层的13．2μA／cm2。预植法处理后得到的化学镀Ni-Cu—P合金镀层具有更好的耐腐蚀性能。
Este proyecto fin de carrera tiene por objeto el estudio de la instalación en baja tensión necesaria para suministro de fuerza electromotriz a los diferentes receptores de fuerza y alumbrado que se proyectan instalar en una nave industrial destinada a la imprenta. La instalación eléctrica constará de: - Instalación de…
Strain macrolocalization behavior using two independent methods of in situ laser speckle-interferometry and reference point method in conjunction with surface profiling of tensile specimens of h.c.p. zirconium alloys is investigated.
In this study, we report a new approach for predicting and analyzing steady state input multiplicities in reactive flash separation processes. Necessary conditions are suggested to detect these multiple steady states using reaction-invariant composition variables. Our results suggest that the conditions proposed for i…
In the recent past, there has been an increasing interest in nanostructured III-V semiconductor materials due to their potential applications including nanowire transistors, molecular electronics and thermoelectric devices. In particular, Indium Antimonide (InSb) has generated a lot of interest due to its direct band…
This study focused on visually and electrochemically characterizing tin (Sn), and platinum (Pt) nanoparticles by Scanning Tunneling Microscopy and UV-Absorption. The purpose of this study was to analyze the correlation between the distribution of nanoparticles in a given area and the amount of time spent waiting for a…
采用自蔓延高温合成法制备V3TiNi0.56Al0.2Crx（x=0～0.3）贮氢合金,经XRD和电化学测试等研究Cr添加量对合金微结构及电化学性能的影响。结果表明：当x为0、0.1和0.2时,V3TiNi0.56Al0.2Crx合金均由V基固溶体主相和TiNi相组成;当x=0.3时,合金由V基固溶体主相和具有六方结构的C14型Laves相组成;随着Cr含量的增加,合金主相的晶胞常数和晶胞逐渐减小;添加Cr以后,合金电极的最大放电容量降低,对活化性能基本没有影响;此外,添加Cr可使合金循环性能得到明显改善,V3TiNi0.56Al0.2Cr0.3合金经过10次充放电循环后,容量保持率为99%,大电流放电性能最好;随着Cr含量的增加…
UDP-Glucose Pyrophosphorylase (UDP-Glc PPase) is a key enzyme of the carbohydrate metabolic pathway widely used among prokaryotes and eukaryotes. In plants, UDP-Glc PPase is necessary for sucrose synthesis while mammals utilize this enzyme for the production of glycogen. A bacterium such as Escherichia coli uses UDP-G…
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2010.
Green composites have been produced from natural oils and agricultural co-products or residues. A variety of natural oil-based resins, both free radically- and cationically-cured, and agricultural filler/fiber reinforcements have been utilized in their production. The natural oils and agricultural filler/fibers of int…
It is known that the body can efficiently repair hard tissue (bone) micro fractures by suturing the defect through the deposition of minerals resulting in an area that is stronger post-injury. Larger defects, however, generally cause more trouble since the body is incapable of repairing them. Bone defects can occur as…
Dumbbell-shaped dimeric polyhedral oligomeric silsesquioxanes (POSS) molecules were synthesised and incorporated into poly(styrene-b-butadiene-b-styrene) (SBS) as nano-fillers via physical blending to prepare novel thermoplastic elastomer nanocomposites. The POSS molecules contained either isobutyl or phenyl compatibi…