Materials Literature
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Показана возможность снижения содержания кислорода в металле сварных швов при автоматической дуговой сварке под флюсом при введении во флюс углеродсодержащей добавки. При этом уменьшается содержание неметаллических включений, улучшаются механические свойства (в том числе увеличивается ударная вязкость металла сварных…
The effect of ethanol extract of the leaves Piliostigma thonningii on haematological and kidney function indices was investigated in Wistar albino rats. Fifteen (15) male Wistar albino rats were allowed to acclimatize to laboratory handling and conditions for seven (7) days, following which they were randomly assigned…
This paper reports the results from laboratory studies on the compressive strength of mortar for Ferro cement that contains ternary blends of Portland cement, silica fume and super plasticizer as water reducing agent. Cement mortars (1:2, 1: 2.5 and 1:3) incorporating various water cementitious ratios (0.32, 0.35 and0…
In this paper, we calculated thermal power, dissipated heat energy and radiated energy due to the current flowing in the body of lightning channel. The peak value of thermal power and total dissipated heat/thermal energy come out to be of the order of 10 10 W and 10 6 J respectively. The calculated radiated energy com…
TiO2 nanomaterials are the research hotspots among recent nanotechnologies,and those are demonstrated having the crucial application prospects in the solar light photocatalytic splitting water into hydrogen,the photocatalytic reduction of CO2,as well as dye-sensitized solar cells.This article mainly reviewed recent re…
There have been a lot of researches on the vapor,carbon dioxide and oxygen contents in the cavity of a hermetic package.At present,the issues about the control of the internal vapor contents less than 5 000 ppm,oxygen contents less than 2 000 ppm,carbon dioxide contents less than 4 000 ppm and helium contents less tha…
The research progress in applications of nano metals and their various types of composites in catalytic degradation and combustion,etc.fields of solid propellants is summarized.The existing technical problems and development prospects in such applications are analyzed.The corresponding reference is provided for resear…
To calculate and monitor ice-coating on transmission lines,a new on-line monitoring method of ice-coating on transmission lines was proposed according to the tensions on tangent tower and tension section.A model was put forward for real-time calculation of the ice-coating thickness through the axial tension,the tensio…
An elastoplastic fracture model for jointed rock mass under compressive loading is presented.In order to account for the mixed mode plastic zone model of wing crack tip of jointed rock under small scale yielding,the dimensionless function of the plastic zone diameter based on the Drucker-Prager(D-P) criterion is deriv…
An organooxotin complex of {[n-Bu2Sn(2,4,6-TMBA)]2O}2 has been synthesized by the reaction of n-Bu2SnO with 2,4,6-TMBA and characterized by IR,1H NMR,13C NMR and elemental analysis.The crystal structure has been determined by X-ray diffraction.It crystallizes in the monoclinic,space group P1,with a= 1.272 56(2) nm,b=1…
溶融Na2SO4中におけるO2−活量をPt電極を用いた電気化学的分極法により制御し，Dy2O3およびNd2O3の溶解挙動を調査した．Dy2O3およびNd2O3の溶融Na2SO4中への溶解量は，アノード電位域では増加したが，カソード電位域では増加せず，両酸化物とも酸性溶解を起こした．両酸化物を酸性溶解させた後の溶融塩中でのカソード電流密度は，酸化物を溶解させていない溶融塩中でのそれよりも大きかった．したがって，溶出した金属イオンのカソード還元反応が起こっていることがわかった．酸化物の溶解実験をした後の溶融塩を用い，定電位カソード分極を行うことにより，電極表面に金属DyおよびNdを析出させた．
SPH simulation is a meshless Lagrangian technique which is appealing as a possible alternative to Numeric techniques currently used to analyze complicated structures,fracture of materials and high deformation events.In the present study,the SPH algorithm has been developed to elasto-plastic analysis and fracture analy…
For nearly three decades, many microcosmic theoretical criterions on impact sensitivity of energetic materials at home and abroad have been suggested by using quantum chemistry calculations and molecular dynamics simulations. In this article, we mainly present some work on thermal decomposition mechanisms and sensitiv…
The isothermal and constant strain rate compression tests of 3003 aluminum alloy were conducted in the strain range of 0.01-10.0 s-1 at 400 ℃ on a Gleeble-1500 thermal simulator.The true stress-true strain curves were obtained in the tests.The results show that the actual deformation temperature of the sample deformed…
To elucidate the effects of exogenous organic substrate and calcium carbonate on the organic carbon mineralization in lime soils and to deepen the understanding of the characteristics of soil organic carbon turnover,the terra fusca,rendzina,and zonal red soil were collected from the Karst region in Huanjiang of Guangx…
The desensitizing technology of high-quality HMX were studied by coated with wax(W) or thermoplastic polyurethane(TPU) as insensitive coating additive.The feasibility study of high-quality HMX coated by W and TPU were proved through contact angle and surface energies.Then the samples were characterized by using SEM an…
The reaction of bipyridine with hydroiodic acid in the presence of iodine gave two new polyiodide-containing salts best described as 4,4´-bipyridinium bis(triiodide), C10H10N2[I3]2, 1, and bis(4,4´-bipyridinium) diiodide bis(triiodide) tris(diiodine) solvate dihydrate, (C10H10N2)2I2[I3]2 · 3 I2 ·2H2O, 2. Both compound…
Significant hardened structures were achieved through frictional stir burnishing (FSB) process. FSB is a process where the rotated at high revolution speed burnishing tool rubbed and stirred the thin surface layer of workpiece. FSB process also give the workpiece surface the heat caused by friction and deformation. On…
油性ゲルはオイルを少量の固化剤を用いてスティックやペースト状にしたもので，おもにメイク化粧品の基剤として活用されている。本解説では，油性ゲルの硬度の制御方法，シリコーンオイルやフッ素オイルの新しい固化方法，そしてゲルからのオイル分離現象について，油性ゲルの固化機構に基づいて説明する。
The increase demand for LNG as alternative of conventional oil fuel and due to the risk assessment of LNG tank . The increase of focus has been put on the performance of welded LNG tank . Where the improvement of 9%Ni steel plates mechanical properties is still continued by steel making to reduce the cost of fabricati…