Materials Literature
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Proton conducting oxides can be beneficial as electrolyte materials in devices such as fuel cells, hydrogen sensors etc. Proton conducting fuel cells (PCFCs), utilising H2 as fuel, stand out as a promising technology for future clean energy generation. The works herein is devoted to improve the performance of current…
The authors present the calculation of electrical equipment reliability using the data of IR-thermography diagnostic of various vessels in different dates. The indicators of ships operation efficiency and safety depend essentially on reliability. Application of technical diagnostic's systems allows preventing or subst…
Employing raster-scanning small- and wide-angle X-ray scattering (SAXS and WAXS), morphological variations in weakly scattering polymers have been mapped. These techniques inherently yield information on multiple length scales, making it possible to correlate structural changes on the atomic, molecular and mesoscale t…
One method to improve the fuel efficiency of American made vehicles is to reduce vehicle weight by substituting steel components with lighter magnesium (Mg) components. Unfortunately, U.S. produced Mg currently costs approximately $3.31 per kg, over seven times the price of steel. Furthermore, Mg production has a stag…
The idea is to present a generic algorithm to model dual-scale flow-deformation processes in manufacturing of advanced composites using poromechanics
论述6KT-1．0型咖啡豆脱壳机脱壳辊的设计过程，对脱壳辊的结构和参数进行设计，校核脱壳辊的强度，进行对脱壳辊的长径比和脱壳机的生产率验算，得到较为科学合理的脱壳辊结构和参数，可以满足咖啡豆脱壳机的使用要求。
In the present work, a new methodology for developing barium hexaferrite was adopted and their structural and magnetic properties were compared with conventionally prepared sample. In the first method barium hexaferrite (BaFe12O19) was prepared by solid state synthesis from barium monoferrite (BaFe2O4) and Fe2O3 with…
采用水热法,以乙二醇为还原剂,直接在钛基体上沉积纳米多孔Pd和Pd-Cu颗粒,制备钛基Pd及Pd-Cu电极材料,研究它们在碱性溶液中对甲酸氧化和氧还原反应（ORR）的电催化活性。结果表明,nanoPd_（81）Cu_（19）/Ti对甲酸氧化具有最大的稳定电流密度,说明Cu的加入极大地改善Pd对甲酸氧化的电活性。所制备的二元Pd-Cu催化剂对ORR的电催化活性均明显高于nanoPd/Ti。在nanoPd_（81）Cu_（19）/Ti电极上,ORR的起始电位相对于nanoPd/Ti电极正移了70 mV,在-0.3 V时ORR的电流密度为2.12 mA/cm~2,是在nanoPd/Ti电极上的3.7倍。
Vertically oriented , bandgap engineered silicon nanopillars were fabricated and addressed. Devices were fabricated via a three dimensional etching process which created sub-5 nm constrictions in silicon radius upon oxidation. This effect was used to create a Coulomb blockade device. Devices were tested at room and li…
Most metals have a small Seebeck coefficient and are unsuitable for thermoelectric devices [1, 2]. The exceptions are metals with a localized magnetic moment, such as provided by a rare-earth ion [3, 4]. There are many metallic compounds which contain either cerium or ytterbium which attain Seebeck coefficients in the…
The Se-Te-Bi amorphous semiconductors have been prepared by melt quenching technique. In the present study, we have theoretically calculated the optical energy band gap, glass transition temperature and density of Se-Te-Bi amorphous semiconductors. Experimentally the optical energy band gap has been found from transmi…
Held isothermal crystallization and dissolution of isotactic polypropylene (PP) and high density polyethylene (HDPE) in a highly viscous solvent – vapor, the latter is considerably slowed down the process of crystallization and dissolution. Therefore udaloos optical and electron microscopy to photograph the initial st…
Abstract—This paper relates to the study of power system harmonics in the built environment and in particular, cable heating caused by proximity effects due to harmonic distortion. Although in recent years, some movement has taken place in the standards to offer harmonic de-rating factors, heating in cables due to ski…
Quantum-scale semiconductors embedded in an electrically-active matrix have the potential to improve photovoltaic (PV) device power conversion efficiencies by allowing the solar spectral absorption and photocarrier transport properties to be tuned through the control of short and long range structure. In the present w…
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将热分析技术与高温液淬技术相结合研究了Al-7%Si合金的凝固过程, 确定了合金冷却曲线上初生相析出阶段的特征参数(TC, ΔTC, ΔtC)和共晶转变阶段的特征参数(Tm, Te, ΔTe, θ, Δte等)。结果表明: 合金凝固时的组织演变能够通过冷却曲线上的特征参数很好地反映出来; 随着冷却速率的增大, 合金的初晶形核过冷度ΔTC和初晶凝固时间ΔtC均减小, 初晶形核率增大, 初晶长大受到抑制; 同时共晶过冷度ΔTe增大, 共晶凝固时间Δte变短, 共晶体的长大受到抑制; 冷却速率对共晶形核温度Tm的影响不大, 即增大冷却速率不能提高共晶形核率。
Along with the progress of people’s environmental protection consciousness and awareness of fire, insulation and flame retardant properties of building materials has been paid more and more at ention. But now a lot of building thermal insulation material has many problems in the flame retardant. This paper introduces…
The ionic liquids were chosen and synthesized for further lignocellulose feedstock pretreatment based on the analysis of the correlation between the properties of ionic liquids and their structures. The synthesis was carried out in two steps through van Leusen substituted imidazoles preparation. The ionic liquids were…
The study explores the potential of cellulose nanocrystals (CNC) and cellulose nanofibers (CNF) to remove positive metal ions from contaminated water. Several methods are available in the market for the removal of heavy metal pollutants from aqueous solutions or industrial effluents, such as chemical precipitation, el…
X-ray Rheology is an experimental technique which uses time-ressolved x-ray scattering as probe of the molecular level structural reorganisation which accompanies flow. It provides quantitative information on the direction alignment and on the level of global orientation. This information is very helpful in interpreti…