检索结果-南通市图书馆

Applied Mathematics and Mechanics(English Edition) 2019年第8期40卷 1135-1154页

作者： s.M.ABO-DAHAB A.M.ABD-ALLA A.A.KILANY Department of Mathematics Faculty of SciencesTaif UniversityTaif 888Saudi Arabia Department of Mathematics Faculty of ScienceSouth Valley UniversityQena 83523Egypt Department of Mathematics Faculty of ScienceSohag UniversitySohag 82524Egypt

The effects of rotation and gravity on an electro-magneto-thermoelastic medium with diffusion and voids in a generalized thermoplastic half-space are studied by using the Lord-shulman (L-s) model and the dual-phase-lag (DPL) model. The analytical solutions for the displacements, stresses, temperature, diffusion concentration, and volume fraction field with different values of the magnetic field, the rotation, the gravity, and the initial stress are obtained and portrayed graphically. The results indicate that the effects of gravity, rotation, voids, diffusion, initial stress, and electromagnetic field are very pronounced on the physical properties of the material.

关键词： electromagnetic field gravity field rotation initial stress voids diffusion normal mode analysis Lord-shulman (L-s) model dual-phase-lag (DPL) model

Changing face of hepatic encephalopathy:Role of inflammation and oxidative stress

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第27期16卷 3347-3357页

作者： Amit s seyan Robin D Hughes Debbie L shawcross Institute of Liver studies King's College London School of Medicine at King's College HospitalKing's College Hospital

The face of hepatic encephalopathy(HE) is *** review explores how this neurocognitive disorder,which is associated with both acute and chronic liver injury,has grown to become a dynamic syndrome that spans a spectrum of neuropsychological impairment,from normal performance to *** central role of ammonia in the pathogenesis of HE remains ***,over the past 10 years,the HE community has begun to characterise the key roles of inflammation,infection,and oxidative/nitrosative stress in modulating the pathophysiological effects of ammonia on the *** review explores the current thoughts and evidence base in this area and discusses the potential role of existing and novel therapies that might abrogate the oxidative and nitrosative stresses inflicted on the brain in patients with,or at risk of developing,HE.

关键词： Hepatic encephalopathy Ammonia Inflammation Oxidative stress Astrocyte

Nitrogen fractionation of certain conventional-and lesser-known by-products for ruminants

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Animal Nutrition 2017年第2期3卷 186-190页

作者： M.s.Mahesh sudarshan s.Thakur Rohit Kumar Tariq A.Malik Rajkumar Gami Animal Nutrition Division ICAR-National Dairy Research Institute (Deemed University) Division of Animal Nutrition Sher-e-Kashmir University of Agricultural Science and Technology-Jammu NDDB-Ration Balancing Program Office

Dietary proteins for ruminants are fractionated according to solubility, degradability and digestibility. In the present experiment, 11 vegetable protein meals and cakes used in ruminant nutrition were included with a main focus on determining various nitrogen(N) fractions in vitro. Total N(N×6.25) content varied from 22.98%(mahua cake) to 65.16%(maize gluten meal), respectively. Guar meal korma contained the lowest and rice gluten meal had the highest acid detergent insoluble nitrogen(ADIN; N×6.25). Boratephosphate insoluble N(BIN, N×6.25) and streptomyces griseus protease insoluble N(PIN; N×6.25) were higher(Ps, whereas groundnut cake and sunflower cake had lower(P spectively. Available N, calculated with the assumption that ADIN is indigestible, was maximum in guar meal korma and minimum in rice gluten meal. Furthermore, rapid and slowly degradable N(N × 6.25) was found to be higher(P spectively. Intestinal digestion of rumen undegradable protein, expressed as percent of PIN, was maximum in guar meal korma and minimum in rice gluten meal. It was concluded that vegetable protein meals differed considerably in N fractions, and therefore, a selective inclusion of particular ingredient is needed to achieve desired level of N fractions to aid precision N rationing for an improved production performance of ruminants.

关键词： ADIN Protein degradability soluble protein streptomyces griseus protease

spinless particles in the field of unequal scalar vector Yukawa potentials

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第4期22卷 81-86页

作者： M.Hamzavi s.M.Ikhdair K.E.Thylwe Department of science and Engineering Abhar Branch Islamic Azad University Abhar Iran Department of Electrical and Electronic Engineering Near East University 922022 Nicosia North Cyprus Mersin 10 Turkey Department of Physics Faculty of Science An-Najah National University Nablus West Bank Palestine KTH-Mechanics Royal Institute of Technology S-100 44 Stockholm Sweden

We present analytical bound state solutions of the spin-zero Klein–Gordon （KG） particles in the field of unequal mix-ture of scalar and vector Yukawa potentials within the framework of the approximation scheme to the centrifugal potential term for any arbitrary l-state. The approximate energy eigenvalues and unnormalized wave functions are obtained in closed forms using a simple shortcut of the Nikiforov–Uvarov （NU） method. Further, we solve the KG–Yukawa problem for its exact numerical energy eigenvalues via the amplitude phase （AP） method to test the accuracy of the present solutions found by using the NU method. Our numerical tests using energy calculations demonstrate the existence of inter-dimensional degeneracy amongst the energy states of the KG–Yukawa problem. The dependence of the energy on the dimension D is numerically discussed for spatial dimensions D = 2–6.

关键词： Klein–Gordon equation Yukawa potential D-dimensional space Nikiforov–Uvarov and amplitude phase methods

A simplified approach to assess seismic stability of tailings dams

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2018年第6期10卷 1082-1090页

作者： sanjay Nimbalkar V.s.Ramakrishna Annapareddy Anindya Pain school of Civil and Environmental Engineering Faculty of Engineering and Information Technology University of Technology Sydney Geotechnical Engineering Group CSIR-Central Building Research Institute (CBRI)

In the zones of high seismic activity, tailings dam should be assessed for the stability against earthquake forces. In the present paper, a simplified method is proposed to compute the factor of safety of tailings dams. The strain-dependent dynamic properties are used to assess the stability of tailings dams under seismic conditions. The effect of foundation soil properties on the seismic stability of tailings dams is studied using the proposed method. For the given input parameters, the factor of safety for lowfrequency input motions is nearly 26% lower than that for high-frequency input excitations. The impedance ratio and the depth of foundation have significant effect on the seismic factor of safety of tailings dams. The results from the proposed method are well compared with the existing pseudo-static method of analysis. Tailings dams are vulnerable to damage for low-frequency input motions.

关键词： Tailings dam Horizontal slice method(HsM) Limit equilibrium strain-dependent property Pseudo-static method

Investigation on the dissolution of η phase in a cast Ni-based superalloy

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2013年第1期20卷 42-48页

作者： M.R. Jahangiri H. Arabi s.M.A. Boutorabi school of Metallurgy and Materials Engineering Iran University of Science and Technology Metallurgy Department Niroo Research Institute Center of Excellence for Advanced Materials & Processing Iran University of Science and Technology

The dissolution behavior of rI phase has been investigated in a cast Ni-based superalloy. The results showed that the platelets and blocks of η phase were formed within the interdendritic regions of the microstructure. Applying standard solution annealing at 1150-1160℃ for a period of 4 h did not result in the complete dissolution of η phase. For the complete dissolution of η phase without residual incipient melting, a 2-step solution annealing has been recommended. After dissolution at high tem- peratures, the TI phase transforms to two MC-type carbides： one is enriched in Ti, Nb, and Ta, and the other is of （Zr,Ti）C type.

关键词： superalloys nickel alloys phase transitions dissolution heat treatment carbides

Moisture effect on the combustion of a single copper concentrate particle in a flash smelting furnace

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2014年第3期21卷 251-258页

作者： E.Hassan Zaim s.H.Mansouri A.Arab solghar Department of Mechanical Engineering School of Engineering Shahid Bahonar University Department of Mechanical Engineering School of Engineering Vali-e-Asr University

A mathematical model has been presented to study the combustion of a single copper concentrate particle with high moisture content. By using the presented model, the effect of particle moisture content on particle temperature, sulfur oxidation, and combustion heat generation has been evaluated. The mineralogical composition of the commonly used concentrate at Khatoonabad flash smelting furnace has been used in this study. It was found that the particle moisture content is removed in the sub-second time range and thus the moisture has marginal impact on the variation of particle temperature and on the reaction rate when the gas temperature is assumed to be constant in the reaction shaft. When a concentrate with high moisture content is charged, the particle size enlargement due to the agglomeration of concentrate particles causes an abrupt fall in the particle reaction rate.

关键词： flash smelting furnaces copper smelting moisture combustion

Localized Corrosion Characteristics of Nickel Alloys： A Review

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica sinica(English Letters) 2017年第4期30卷 296-305页

作者： Helmuth sarmiento Klapper Natalia s. Zadorozne Raul B. Rebak Center for Materials Research Baker Hughes 29221 CelleGermany Instituto de Materiales de Misiones (IMAM) UNaMCONICET 3300 Posadas Argentina GE Global Research Schenectady NY 12309 USA

There are a great variety of commercial nickel alloys mainly because nickel is able to dissolve a large amount of alloying elements while maintaining a single ductile austenitic phase. Nickel alloys are generally designed for and used in highly aggressive environments, for example, those where stainless steels may experience pitting corrosion or environmentally assisted cracking. While nickel alloys are generally resistant to pitting corrosion in chloride-containing environments, they may be prone to crevice corrosion attack. Addition of chromium, molybdenum and tungsten increases the localized corrosion resistance of nickel alloys. This review on the resistance to localized corrosion of nickel alloys includes specific environments such as those present in oil and gas upstream operations, in the chemical process industry and in seawater service.

关键词： Nickel alloys Localized corrosion Oil and gas seawater Chemical process industry

CuPc based organic-inorganic hetero-junction with Au electrodes

在线全文

学校读者我要写书评

暂无评论

Journal of semiconductors 2010年第7期31卷 22-25页

作者： Zubair Ahmad Muhammad H.sayyad Kh.s.Karimov Ghulam Ishaq Khan Institute of Engineering sciences and Technology TopiNWFP23460Pakistan Department of Mechanical Engineering 20 Symond Street AucklandUniversity of AucklandNew Zealand

A hetero-junction of n-silicon（n-si） and copper phthalocyanine（CuPc） has been *** current -voltage characteristics were investigated to explain the rectification and conduction *** effect of temperature and humidity on the electrical properties of n-si/CuPc hetero-junction has also been *** characteristics of the junction have been observed to be temperature and humidity dependent,so it is suggested that this junction can be used as a temperature and humidity sensor.

关键词： inorganic-organic hetero-junction n-si CuPc

Experimental study on behaviors of polypropylene fibrous concrete beams

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-science A(Applied Physics & Engineering) 2007年第7期8卷 1101-1109页

作者： sUJI D. NATEsAN s. C. MURUGEsAN R. sathyabama Institute of science and Technology Chennai Tamil Nadu India VLB Janakiammal College of Engineering and Technology Coimbatore Tamil Nadu India Gojan school of Business and Technology Red Hills Chennai Tamil Nadu India

synthetic fibers made from nylon or polypropylene have gained application when loose and woven into geo textile form although no information on the matrix’s mechanical performance is obtained so that more understanding of their structural contribution to resist cracking can be determined. This paper presents the results of an experimental investigation to determine the performance characteristics of concrete reinforced with a polypropylene structural fiber. In this investigation “Fiber mesh” brand of fibers manufactured by sL Concrete system, Tennessee, UsA and marketed by M/s Millennium Building system, Inc., Ban-galore, India are used. The lengths of the fibers used were 24 mm. Fiber dosages used were 0.9, 1.8, 2.7 kg/m3. A total of three mixtures, one for each fiber dosage were made. A standard slump cone test was conducted on the fresh concrete mix with and without fibers to determine the workability of the mix. The test program included the evaluation of hardened concrete properties such as compressive, split tensile, modulus of rupture and flexural strengths. The increase in compressive strength is about 36.25%, 26.20%, and 23.75% respectively that of plain concrete. This increase in strength was directly proportional to amount of fibers present in the mix. The increase in flexural strength for Mixes I^III is about 21%, 16.6%, and 23% respectively that of plain concrete specimens. An experimental investigation was also made to study the behaviors of reinforced fibers concrete beams (with longitudinal reinforcements) under two-point loading. The deflection and crack patterns were also studied. The improvements in strength and ductility characteristics were discussed.

关键词： Fiber Reinforcement Concrete Mechanical properties Polypropylene Fibre Reinforced Concrete (PFRC)