Materials Literature
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Based on the theory of two-phase flow, the disk thermal dispering mechanism and influence to stickies was analyzed in this paper. The force between fibers and stickies was focused on when the disk was working. The results showed that stickies were peeled from fibers and dispersed into small particles during the flowin…
The high density foam glass is prepared by sintered method using waste cathode ray tubes neck glass and PbO as raw materials, adding a certain quantity SiC, PbF2, Fe2O3, Bi2O3. The properties of high density foam glass were analyzed by means of XRD and SEM. The results show that the higher the foaming temperature, the…
The Hampton Roads Sanitation District (HRSD) operates thirteen treatment plants in the eastern Virginia area with a combined capacity of 231 million gallons per day (mgd). The Nansemond Treatment Plant (NTP) is one of the larger facilities, and is designed to treat 30 mgd using a 3-stage Virginia Initiative Process (V…
Terdapat cacat pada produk handle sekop yang diproduksi dengan proses injection molding di PT. Pudjo Langgeng yaitu menghasilkan sinkmark. Masalah ini disebabkan oleh setting parameter proses yang belum standar dan masih menggunakan cara coba-coba. Untuk mengetahui hubungan antara cacat produk dengan variable proses s…
VO(subscript x)/AlO3 catalysts were prepared by modified impregnation method and characterized by XRD, Uv-Vis, H2-TPR, NH3-TPD and pyridine-absorbed FT-IR techniques. The catalytic performances of the catalysts for dimethyl ether (DME) oxidation to formaldehyde were evaluated as well. The results showed that the vanad…
The vinyltriethoxysilane (VTES) modified SiO2-YAG: Ce(superscript 3+) glass phosphor was successfully prepared by sol-gel method. The glass phosphor was characterized by X-ray diffraction (XRD), photoluminescence spectra (PL), photoluminescence excitation spectra (PLE) and infrared absorption (IR) spectra. It showed t…
Mg-Al hydrotalcite-supported MnO4(superscript -), Cr2O7(superscript 2-) and IO4(superscript -) catalysts (named HT-MnO4(superscript -), HT-Cr2O7(superscript 2-) and HT-IO4(superscript -), respectively) were prepared by coprecipitation method and subjected to liquid-phase oxidation of alcohols (benzyl alcohol, p-methox…
The paper is devoted to determination of analytical dependence of the wear coefficient for materials of parts of the conjugation of type “shaft-to-bushing”.
Doped manganese oxides such as La0.67Ca0.33MnO3 (LCMO) are strongly correlated electron systems which display an insulator to metal transition upon cooling at a temperature T_MI. At low temperature the material is ferromagnetic. Above the transition the material is a paramagnetic insulator in which conduction is gover…
The project deals with the detection of transmission line fault and the place where the fault has occurred. With conventional methods we can not find the location, whereas wavelet makes the location detection very easy. Certain faults like open, short may be detected using simple electronic circuitry, but the location…
본 논문에서는 실리콘 태양전지의 흡수효율 증가를 위해 도파모드 공진 특성을 이용한 격자 구조를 제안하였다. 도파모드 공진을 이용함으로써 두께를 ~200 nm 수준으로 줄이면서도 높은 흡수율을 기대할 수 있는 태양전지 설계가 가능함을 확인하였다. 제안된 구조는 은으로 된 반사경 위에 격자구조를 갖는 Poly-Si 유전체 층이 존재하는 1-D 구조로서 각 구조변수들 즉 격자의 주기, 유전체 두께, 격자 간격 및 깊이 등이 흡수 효율에 어떤 영향을 미치는지 알아보고, 변수들의 조절을 통해 최적의 구조를 찾고자 시도하였다. PSO알고리즘을 사용하여 제안된 구조의 적절성을…
Data relative to proton and pion production produced in central collisions have been reviewed by S. Nagamiya. Therefore, the production of complex fragments is emphasized here. A presentation is made of experimental data on d, t, /sup 3/He emission and their discussion in terms of the existing models. The size of fire…
A new series of 2,5-bis[4-n-alkoxybenzoyloxy-(4-benzoyloxy)]-3,6-dichloro-1,4-benzoquinones, C6Cl2O2(OCOC6H4OCOC6H4OR)2, where R = CmH2m + 1 and m = 7, 8, 9, 10, 11, 12, 14, and 16, have been synthesized. These compounds have been characterized by elemental analyses, FT-IR, UV-visible, 1H, and 13C NMR spectra. Mesomor…
Migration and diffusion properties of synthesized azo dyes from 2-aminothiazole derivatives applied on commercial grade undyed cellulose acetate (CA) and cellulose triacetate (CTA) were investigated using dyeing conditions of 2% on weight of fabric (owf), 50:1 liquor ratio and subjected to ISO3 and ISO4 standard wash…
As preferências conformacionais de 2-halocicloexanonas foram investigadas com sucesso, no passado. No entanto, em virtude dos recursos e conhecimento disponíveis na época, os fatores que governam esses interessantes sistemas modelo não puderam ser precisamente determinados. Atualmente, dispõem-se de ferramentas comput…
This thesis presents the findings of a study on incorporating vanous\nthermoset resins into natural rubber for property improvement. Natural rubber\nis an important elastomer with the unique attribute of being a renewable\nagricultural product. The study was undertaken to investigate the extent to\nwhich the drawbacks…
NaYF4: Yb, Er upconversion nanoparticles with strong fluorescent intensity were synthesized in the liquid paraffin-oleic acid system via a thermolysis method, with the rare earth stearate used as precursor The as-prepared nanoparticles were characterized by TEM, XRD, FT-IR and luminescence spectroscopy It was inferred…
No abstract prepared.
Using potassium carbonate as acid binding agent and DMF as solvent, ethyl 2-chloroethoxyaetate was synthesized by the condensation of chloroethanol and ethyl bromoacetate. 2-(2-Chloroethoxy) acetamide was synthesized by the amination of ethyl 2-chloroethoxyaetate in the ethanol solution of ammonia. Optimal conditions:…
3,4-dimethylbenzoic acid was synthesized by direct carboxylation of o-xylene with carbon dioxide used AlCl3 as catalyst, and the reaction conditions were optimized. The optimal reaction parameters were determined as follows: 0.8MPa~0.9MPa, 50℃, reaction time 12 hours, and AlCl3/o-xylene mass ratio of 62.13%. Under the…