检索结果-南通市图书馆

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第8期13卷 633-640页

作者： Chiong Ing TIONG Yahya AZLI mohammed rafiq abdul kadir Samion SYAHRULLAIL School of Postgraduate Studies Universiti Teknologi Malaysia81310 UTM SkudaiJohorMalaysia Faculty of Electrical Engineering Universiti Teknologi Malaysia81310 UTM SkudaiJohorMalaysia Faculty of Biomedical Engineering & Health Science Universiti Teknologi Malaysia81310 UTM SkudaiJohorMalaysia Faculty of Mechanical Engineering Universiti Teknologi Malaysia81310 UTM SkudaiJohorMalaysia

The effects of the mechanical factors with applied loads on the tribological performance of refined,bleached and deodorised(RBD) palm stearin(PS) were studied using a four-ball *** the RBD PS results were simultaneously compared with the additive-free paraffinic mineral oil(PMO).The experiments were carried out using different loads with a constant speed in order to gain a better understanding of the mechanical processes that occurred during the *** each experiment,the temperature was increased to 75 °C and was run for 1 *** a mechanical system,lubricant plays an important role in reducing wear and *** exists as a semi-solid at room temperature after the fractionation process from oil *** to the increasing rate of pollution to the environment,vegetable oil was chosen as the test lubricant with regard to its *** advantages of vegetable oil are that it is more easily harvestable and non-toxic compared to petroleum-based oil,which made it a suitable *** the experiment,RBD PS is found to have a better friction constraint reduction compared with additive-free PMO.

关键词： Palm stearin (PS) Four-ball tribotester Paraffinic mineral oil (PMO) Friction coefficient

Mechanical and corrosion properties of partially degradable bone screws made of pure iron and stainless steel 316L by friction welding

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2018年第4期61卷 593-606页

作者： Ahmad Kafrawi Nasution Mokhamad Fakhrul Ulum mohammed rafiq abdul kadir Hendra Hermawan Department of Mechanical Engineering Faculty of Engineering Muhammadiyah University of Riau Faculty of Veterinary Medicine Bogor Agricultural University Faculty of Biosciences and Medical Engineering Universiti Teknologi Malaysia Department of Mining Metallurgical and Materials Engineering & CHU de Québec Research Center Laval University

This paper reports a series of in vitro, ex vivo and in vivo mechanical and corrosion studies of pin and screw prototype made of friction welded pure iron and 316 L type stainless steel aiming to evaluate the applicability of the partially removable bone screws. Results showed that the pin possesses bending, tensile and torsional strengths of1706±147, 666±7 and 0.34±0.03 MPa, respectively. The pin degraded at an average weight loss rate of 17.15×10-5 g cm-2 day-1 and released Fe ions at an average concentration of 2.38 ppm. Plastic deformation induced by torsion increased the corrosion rate of the pin from 0.0014 to 0.0137 mm *** maximum pull-out load of the screw prototypes was3800 N with a calculated failure strength by shear load equal to22.2 k N which is higher than the strength of the cortical *** analysis of the rat's blood cells during 60 days of the pin implantation indicated a normal response with low neutrophils/lymphocytes ratio of 0.3-0.5. Iron ion concentration in the rat's blood slightly increased from 55 to 61 ppm without affecting the tissue recovering and healing phase. Histological evaluation confirmed the presence of macrophage cells as a normal response to the released iron particles around the iron section of the pin.

关键词： biodegradable metal bone screw friction welding iron stainless steel

Effect of Multi-Step Tempering on Retained Austenite and Mechanical Properties of Low Alloy Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第12期18卷 49-56页

作者： Hamid Reza Bakhsheshi-Rad Ahmad Monshi Hossain Monajatizadeh Mohd Hasbullah Idris mohammed rafiq abdul kadir Hassan Jafari Materials Engineering Department Islamic Azad University Materials Engineering Department Faculty of Mechanical EngineeringUniversity Technology Malaysia Materials Engineering Department Faculty of Mechanical EngineeringShahid Rajaee Teacher Training University

The effect of multi-step tempering on retained austenite content and mechanical properties of low alloy steel used in the forged cold back-up roll was *** evolutions were characterized by optical microscope,X-ray diffraction,scanning electron microscope and Feritscope,while the mechanical properties were determined by hardness and tensile *** results revealed that the content of retained austenite decreased by about 2% after multi-step ***,the content of retained austenite increased from 3.6% to 5.1% by increasing multi-step tempering *** hardness and tensile strength increased as the austenitization temperature changed from 800 to 920 ℃,while above 920 ℃,hardness and tensile strength *** addition,the maximum values of hardness,ultimate and yield strength were obtained via triple tempering at 520 ℃,while beyond 520 ℃,the hardness,ultimate and yield strength decreased sharply.

关键词： cold back-up roll retained austenite mechanical property austenite grain size

Effect of fluoride treatment on corrosion behavior of Mg-Ca binary alloy for implant application

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2013年第3期23卷 699-710页

作者： Hamid Reza Bakhsheshi-Rad Mohd Hasbullah Idris Moha mmed rafiq abdul kadir Mohammadreza Daroonparvar Materials Engineering Department Faculty of Mechanical EngineeringUniversiti Teknologi MalaysiaSkudai 81310JohorMalaysia Department of Biomechanics & Biomedical Materials Faculty of Biomedical Engineering & Health SciencesUniversiti Teknologi MalaysiaSk udai 81310JohorMalaysia

The influence of hydrofluoric acid（HF） treatment on the corrosion behavior of the Mg-0.5Ca alloys was investigated by immersion specimen in sodium hydroxide and HF solutions with various concentrations and durations at room *** evolutions of the specimens were characterized by atomic force microscopy,X-ray diffraction,field-emission scanning electron *** corrosion resistance was examined through potentiodynamic polarization and immersion test in Kokubo *** results revealed that the fluoride treated Mg-0.5Ca alloys produced by immersion in 40% HF provided more uniform,dense and thicker coating layer（12.6 μm） compared with the 35% HF treated *** electrochemical test showed that the corrosion resistance of fluoride treated specimen was 35 times higher compared with the untreated Mg-0.5Ca alloy specimen in Kokubo *** vitro degradation rate of the fluoride treated specimens was much lower than untreated Mg-0.5Ca alloy in Kokubo *** immersion test the surface of 40% HF treated sample showed a few corrosion dots,while untreated specimens were fully covered by corrosion products and *** treated Mg-0.5Ca alloy with 40% HF is a promising candidate as biodegradable implants due to its low degradation kinetics and good biocompatibility.

关键词： Mg-Ca alloy surface treatment corrosion behavior biocompatibility

Green synthesis of silver nanoneedles using shallot and apricot tree gum

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2015年第10期25卷 3286-3290页

作者： Mohammad Mahdi TAHERI mohammed rafiq abdul kadir Noor Kamila AHMAD SHAFIAI Tolou SHOKUHFAR Mahtab ASSADIAN Mostafa Rezazadeh SHIRDAR Materials Engineering Department Faculty of Mechanical EngineeringUniversiti Teknologi Malaysia Medical Devices & Technology Group Faculty of Bioscience and Medical EngineeringUniversiti Teknologi Malaysia Department of Mechanical Engineering-Engineering Mechanics Multiscale Technologies InstituteMichigan Technological University Department of Bioengineering University of Illinois at Chicago

A green synthesis method to produce silver nanoneedles was described using shallot and apricot tree gum（ATG）.A fast,simple,and low cost method was used to synthesize silver with nanoparticle and nanoneedle shape from the silver nitrate *** as a reducing agent and apricot tree gum（ATG） as a stabilizer and a capping agent were utilized to reduce and form silver ions into silver atoms with needle and particle ***,high crystalline structures of silver nanoparticles（AgNPs） with diameters of 8-20 nm and silver nanoneedles with average diameters of 50-60 nm and lengths of 5-10 μm were consequently synthesized by shallot and the mixture of shallot and ATG.A self-assembly mechanism was proposed to indicate the formation of needle-like structures of spherical Ag NPs via carbon chains of *** results indicate that the presence of ATG with shallot can transfer the reduced Ag NPs into the silver *** findings were characterized using X-ray diffraction（XRD）,ultra violet visible（UV-Vis） spectrometry,field emission scanning electron microscopy（FESEM）,and transmission electron microscopy（TEM） techniques.

关键词： green synthesis silver nanoneedle nanoparticle shallot apricot tree gum self-assembly

Zinc-doped hydroxyapatite-zeolite/polycaprolactone composites coating on magnesium substrate for enhancing in-vitro corrosion and antibacterial performance

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2020年第1期30卷 123-133页

作者： Nida IQBAL Saman IQBAL Tanveer IQBAL H.R.BAKHSHESHI-RAD Ahmed ALSAKKAF Ahmad KAMIL mohammed rafiq abdul kadir Mohd Hasbullah IDRIS H.Balaji RAGHAV Biomedical Engineering Centre University of Engineering and TechnologyKala Shah Kaku(KSK)CampusLahorePakistan Department of Physics University of the PunjabQuaid-e-Azam CampusLaborePakistan Department of Chemical Polymer&Composite Material Engineering University of Engineering and TechnologyKala Shah Kaku(KSK)New CampusLahorePakistan Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran School of Mechanical Engineering Faculty of EngineeringUniversiti Teknologi MalaysiaJohorMalaysia Kulliyyah of Science International Islamic University MalaysiaBandar Indera Mahkota CampusJalan Sultan Ahmad Shah25200 KuantanPahang Darul MakmurMalaysia School of Biomedical Engineering and Health Sciences Faculty of EngineeringUniversiti Teknologi MalaysiaJohorMalaysia Tissue Engineering Group(TEG) National Orthopaedic Centre of Excellence in Research and Learning(NOCERAL)Department of Orthopaedic SurgeryFaculty of MedicineUniversity of Malaya50603 Lembah PantaiKuala LumpurMalaysia

This work is focused on developing zinc-doped hydroxyapatite-zeolite(Zn HA-Zeo)and polycaprolactone(PCL)composite coatings on magnesium(Mg)substrate to improve the corrosion resistance and antimicrobial ***-coating technique was used to coat Zn HA-Zeo/PCL on the Mg substrate at room *** samples were subjected to field emission scanning electron microscopy(FESEM),X-ray diffraction(XRD),Fourier transform infrared(FTIR),energy dispersive X-ray spectroscopy(EDX)and antimicrobial *** demonstrated that composite coatings consist of HA,scholzite,zeolite,and PCL *** spectra indicated the presence of calcium(Ca),silicon(Si),aluminum(Al),zinc(Zn),phosphorus(P)and oxygen(O).The composite surface appeared in spherical-like microstructure on coating with thickness ranging 226-260μ***-doped HA-Zeo composite coating had a high corrosion resistance and provided sufficient protection to the Mg surface against galvanic *** Zn HA-Zeo coating samples exhibited superior disc inhibition by confirming antimicrobial activity against the *** as compared to HA-Zeo *** these results showed that the Zn HA-Zeo coatings not only improved the corrosion resistance,but also enhanced the antimicrobial property and hence they can be used as suitable candidates for implant applications.

关键词： biodegradable magnesium bioceramics coating corrosion resistance antimicrobial activity

Identification of potential inhibitors for Sterol C-24 reductase of Leishmania donovani through virtual screening of natural compounds

在线全文

学校读者我要写书评

暂无评论

BIOCELL 2021年第6期45卷 1601-1610页

作者： FAZLUR RAHMAN SHAMS TABREZ RAHAT ALI SAJJADUL kadir AKAND mohammed AALAIDAROUS mohammed ALSAWEED BADER mohammed ALSHEHRI SAEED BANAWAS ABDUR RUB abdul AZIZ BIN DUKHYIL Infection and Immunity Laboratory(414) Department of BiotechnologyJamia Millia Islamia-A Central UniversityNew Delhi110025India Department of Medical Laboratory Sciences College of Applied Medical SciencesMajmaah UniversityAl Majmaah11952Saudi Arabia Health and Basic Sciences Research Center Majmaah UniversityAl Majmaah11952Saudi Arabia

Leishmaniasis is a vector-borne parasitic neglected tropical disease caused by a group of about 30 different species of the genus *** is transmitted by the bite of female phlebotomies sand *** main clinical manifestations of leishmaniasis include cutaneous,visceral,and mucocutaneous *** leishmaniasis(VL)caused by Leishmania donovani,is an infection of reticuloendothelial system and fatal if ***,a sterol that is prominent in the mammalian cell membranes whereas stigmasterol and ergosterol are more prevalent in plants,yeast,and protozoa,*** which is absent in human being,is an important constituent of parasite *** C-24 reductase(LdSR)enzyme catalyzes the final step in the ergosterol biosynthesis *** inhibition of biosynthesis of ergosterol may lead to decreased cell viability and ***,we performed the molecular docking-based virtual screening of a library of natural ligands against LdSR to identify a potential inhibitor to fight ***,prenyletin,flavan-3-ol,resveratrol,and gingerol showed the top binding affinity towards *** upon ADME properties and bioactivity score,gingerol showed the best lead-likeness and drug-likeness ***,we further annotated its leishmanicidal *** found that gingerol inhibited the growth and proliferation of promastigotes as well as intra-macrophagic *** exerted its antileishmanial action through the induction of reactive oxygen species(ROS)in concentration-dependent *** induced ROS led to ***,this study described that gingerol would act as possible inhibitor to LdSR.

关键词： Leishmania Gingerol Sterol C-24 reductase Molecular docking ROS

Mathematical models for process commonality under quality and resources breakdown in multistage production

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

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第11期12卷 837-848页

作者： mohammed abdul WAZED Shamsuddin AHMED Yusoff Bin NUKMAN Department of Engineering Design and Manufacture University of Malaya Department of Mechanical Engineering Chittagong University of Engineering and Technology(CUET)

It is essential to manage customers' diverse desires and to keep manufacturing costs as low as possible for survival in competition and eventually in *** resources in manufacturing for different products is a vital method of accomplishing this *** advantages of using a common process in production are stated in the ***,the mathematical models as well as simulation or conceptual models are not *** main objective of this paper is to develop mathematical models for multiproduct and multistage production under quality and breakdown *** idea of the process commonality is incorporated in the proposed *** models are validated by primary data collected from a Malaysian company and comparison of the timely requirement schedules of earlier MRP II and the proposed models under stable and perfect production *** appreciable convergence of the outcomes is ***,the proposed models are carrying additional information about the available locations of the parts in a time *** validation,the effects of process commonality on cost,capacity and the requirement schedule under uncertainties are *** is observed that the use of common processes in manufacturing is always better than the non-commonality scenario in terms of production ***,the increase in capacity requirement for commonality designs is higher for an ideal system,while it is less when the system suffers from breakdowns and a quality problem.

关键词： Process commonality Mathematical model MRP II Quality Breakdown

Photocatalytic degradation of Chicago Sky Blue 6B and Benzopurpurin 4B using titanium dioxide thin film

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2005年第5期17卷 869-872页

作者： abdul K. mohammed Katrina T. McKenzie Department of Chemistry Winston-Salem State UniversityDepartment of Chemistry North Carolina Agricultural and Technical State University 601 S. Martin Luther King Jr. Drive Winston-Salem North Carolina 27110 USA1601 E. Market Street Greensboro North Carolina 27411 USA

Aqueous solutions of azo dyes undergo degradation to form harmless intermediates and colorless products following irradiation by visible light in the presence of titanium dioxide thin films. The dyes that were studied in this work are： Chicago Sky Blue 6B and Benzopurpurin 4B. Results obtained indicated that complete mineralization of the dyes took place under the experimental conditions. There was an increase in conductivity after the complete mineralization experiments possibly indicating the formation of ions such as NO3^- and SO4^2-. Chemical oxygen demand（COD） measurements show a decrease in organic matter for both dyes following complete degradation. The effect of how changing experimental conditions such as pH, temperature and starting concentrations of dyes affected the rate of dye degradation was measured. There was an increase in the rate of disappearance of the dye color at lower pH. High concentrations of dye solutions reauired Iona dearadation time.

关键词： titanium dioxide photocatalysis photocatalytic degradation azo dyes

A Joint Resource Allocation Algorithm for D2D Communication

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第2期70卷 3751-3762页

作者： abdul kadir Hamid Lamia Osman Widaa Fahd N.Al-Wesabi Imran Khan Anwer Mustafa Hilal Manar Ahmed Hamza Abu Sarwar Zaman mohammed Rizwanullah Department of Electrical&Computer Engineering University of SharjahSharjahUnited Arab Emirates Department of Electrical Engineering College of EngineeringPrincess Nourah bint Abdulrahman UniversitySaudi Arabia Department of Computer Science King Khalid UniversityMuhayel AseerKSA&Faculty of Computer and ITSana’a UniversityYemen Department of Electrical Engineering University of Engineering and Technology PeshawarPakistan Department of Computer and Self Development Preparatory Year DeanshipPrince Sattam bin Abdulaziz UniversityAlKharjSaudi Arabia

The emergence of multimedia services has meant a substantial increase in the number of devices in mobile networks and driving the demand for higher data transmission *** result is that,cellular networks must technically evolve to support such higher rates,to be equipped with greater capacity,and to increase the spectral and energy *** with 4G technology,the 5G networks are being designed to transmit up to 100 times more data volume with devices whose battery life is 10 times ***,this new generation of networks has adopted a heterogeneous and ultra-dense architecture,where different technological advances are combined such as device-to-device(D2D)communication,which is one of the key elements of 5G *** has immediate applications such as the distribution of traffic load(data offloading),communications for emergency services,and the extension of cellular coverage,*** this communication model,two devices can communicate directly if they are close to each other without using a base station or a remote access ***,eliminating the interference between theD2Dand cellular communication in the *** interference management has become a hot issue in current *** order to address this problem,this paper proposes a joint resource allocation algorithm based on the idea of mode selection and resource *** results showthat the proposed algorithm effectively improves the systemperformance and reduces the interference as compared with existing algorithms.

关键词： D2D communication resource allocation wireless networks mobile communication