检索结果-南通市图书馆

Journal of Rare Earths 2021年第2期39卷 151-159页

作者： Irshad Ahmad Muhammad Shoaib Akhtar ejaz ahmed Mukhtar Ahmad Department of Physics Bahauddin Zakariya UniversityMultan60800Pakistan School of Computer and Communication Lanzhou University of TechnologyLanzhou 730000China

Facile combustion route synthesized Al and Ce co-doped ZnO nanoparticles photocatalysts were characterized using XRD,SEM,BET,EDS,UV-visible DRS,PL,photocurrent and EIS *** and SEM analyses identify that crystallite and particle size is reduced from 13.26 to 11.88 nm with introduction of Al and Ce into ZnO which assists inhibiting the recombination of photo generated charge *** DRS spectra indicate that optical assimilation of ZnO is significantly increased to visible region(-406 nm)and band gap reduces from 3.18 to 3.06 eV with introduction of Al and Ce *** impedance spectroscopy analysis under visible light illumination confirms the enhancement in visible light activity of Al and Ce co-doped ZnO nanoparticles as *** enhanced activity of Al and Ce co-doped ZnO photocatalyst can be ascribed to enhanced light assimilation,high surface area and efficient charge transfer *** results reveal that by incorporating precise amount of Al(~2%)and Ce(~2%)into ZnO,a highly efficient catalyst can be synthesized that have degraded almost 95%methyl orange(MO)dye in just 45 ***,the influence of various operational parameters such as solution pH,catalyst dose,dye concentration,airflow rate and light intensity on photodecomposition of MO was *** rmore,a possible mechanism for Al and Ce modified ZnO was proposed and designed photocatalysts demonstrates good stability in aqueous medium.

关键词： Nanoparticles ZnO Combustion MO decomposition PL Rare earths

维普期刊数据库

Structural and optical properties of Cr doped ZnO crystalline thin films deposited by reactive electron beam evaporation technique

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2013年第1期23卷 64-69页

作者： Amjid Iqbal Arshad Mahmood Taj Muhammad Khan ejaz ahmed National Institute of Laser and Optronics(NILOP) P.O.NiloreIslamabad 45650Pakistan Physics Division PINSTECH P.O.NiloreIslamabad 45650Pakistan

ZnO and Cr-doped ZnO thin films are grown on to glass substrates using reactive electron beam(e-beam) evaporation *** of structural,morphological,and optical properties with Cr doping is investigated.X-ray diffraction(XRD) studies show that the films are polycrystalline in nature with single *** dispersive spectroscopy(EDS) results demonstrate that Cr ions are substitutionally incorporated into *** force microscopy(AFM) reveals that the films present a compact surface and root mean squared(RMS) roughness increased with Cr *** optical band gap energy Eg of the films has been determined using Transmission data by spectrophotometer and *** band gap energy found to be decreased with increasing Cr doping *** optical constants(refractive index,extinction coefficient) are calculated using ellipsometry and found to increase with Cr doping concentration.

关键词： Cr doping Thin film ZnO thin films Roughness Ellipsometry Optical constants

Vasculitis with renal involvement in essential mixed cryoglobulinemia:Case report and mini-review

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2014年第5期2卷 160-166页

作者： Sabiha Anis Khawar Abbas Mohammad Mubarak ejaz ahmed Sajid Bhatti Rana Muzaffar Department of Immunology and Molecular Biology Dewan Farooq Medical ComplexSindh Institute of Urology and TransplantationKarachi 74200Pakistan Department of Histopathology Sindh Institute of Urology and TransplantationKarachi 74200Pakistan Department of Nephrology Sindh Institute of Urology and TransplantationKarachi 74200Pakistan

The discovery of a strong association between hepatitis C virus(HCV) infection and mixed cryoglobulinemia(MC) has led to an increasingly rare diagnosis of idiopathic essential MC(EMC).The incidence of EMC is high in regions where there is a comparatively low HCV infection burden and low in areas of high infection prevalence,including *** diagnosis of EMC requires an extensive laboratory investigation to exclude all possible causes of cryoglobulin *** addition,although cryoglobulin testing is simple,improper testing conditions will result in false negative ***,we present a 46-year-old female patient with a case of EMC with dermatological and renal manifestations,highlighting the importance of extensive investigation to reacha proper *** review the need for appropriate laboratory testing,which is often neglected in clinical practice and which can result in false negative *** review also emphasizes the significance of an extended testing repertoire necessary for better patient *** a strong association of MC with HCV infection and other causes that lead to cryoglobulin formation,EMC remains a separate *** diagnosis requires proper temperature regulation during sample handling,as well as characterization and quantification of the *** of rheumatoid factor activity and complement levels in the cryoglobulin test-panel promotes better patient management and *** guidelines should be developed and implemented for cryoglobulin detection and the diagnosis of cryoglobulinemic syndrome,which will reduce variability in inter-laboratory reporting.

关键词： Cryoglobulin characterization Cryoglobulin detection Essential mixed cryoglobulinemia Cryoglobulinemic glomerulonephritis Hepatitis C virus Renal manifestations

Vascular and Morphogenetic Abnormalities Associated with Exposure of Cigarette Smoke Condensate during Chicken and Murine Embryogenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2010年第4期23卷 305-311页

作者： SOHAIL ejaz ahmed ejaz AMARA SOHAIL CHAE WOONG LIM Department of Clinical Neurosciences Neurology Unit Addenbrookes Hospital University of Cambridge District Headquarter Hospital Government Social Security Hospital Gujranwala Pakistan Biosafety Research Institute and College of Veterinary Medicine Chonbuk National University

Objective Embryonic movements （EM） and angiogenesis pathways are evolutionarily conserved mechanisms which are essential for proper embryonic development. Deviations in these processes by exposure to cigarette smoke condensate （CSC） may cause vascular and morphogenetic disorders. Methods Using chicken and mouse embryos, we have demonstrated the in vivo effects of CSC on EM, vascular development, and organogenesis. Results Examination of the CSC exposed chicken embryos revealed a significant reduction in EM, stunted growth, deviated pattern of blood vessels, hemorrhages, and localized necrosis. Likewise, mouse embryos that were exposed to CSC at E8.5 and E9.5 died between E11.5 and E12.5, respectively. These mouse embryos showed defects in morphogenesis and remodeling of the embryonic vasculature, while littermate controls showed normal development. Conclusion Cigarette smoking during pregnancy is fatal for growing embryos. CSC may induce the remodeling of embryonic vasculature, leading to various pathologies.

关键词： Angiogenesis Embryonic movements Cigarette smoke condensate Vascular remodeling

维普期刊数据库

The correlation of spot urinary protein-to-creatinine ratio with 24-h urinary protein excretion in various glomerulopathies

在线全文

学校读者我要写书评

暂无评论

World Journal of Nephrology 2023年第5期12卷 159-167页

作者： Amber Raza Syed Haider Nawaz Rahma Rashid ejaz ahmed Muhammed Mubarak Department of Nephrology Sindh Institute of Urology and TransplantationSindhKarachi 74200Pakistan Department of Pathology Sindh Institute of Urology and TransplantationSindhKarachi 74200Pakistan

BACKGROUND Proteinuria is an important and well-known biomarker of many forms of kidney *** quantitation is of particular importance in the diagnosis and management of glomerular *** quantification can be done by several *** these,the measurement of 24-h urinary protein excretion is the gold standard ***,it is cumbersome,time-consuming,and inconvenient for patients and is not completely *** alternative methods have been tested over time albeit with conflicting *** the latter,the measurement of urine protein-to-creatinine ratio(uPCR)in singlevoided urinary samples is widely *** majority of studies found a good correlation between uPCR in single urine samples with 24-h urinary protein estimation,whereas others did *** To investigate the correlation of spot uPCR with 24-h urinary protein estimation in patients suffering from different forms of glomerulopathies at a single largevolume nephrological center in *** This cross-sectional,observational study was conducted at the Department of Nephrology,Sindh Institute of Urology and Transplantation,Karachi,Pakistan from September 2017 to March *** newly presenting adult patients with proteinuria who were being investigated for suspected glomerulonephritis and persistent proteinuria with ages between 18 to 60 years were *** patients were given detailed advice regarding 24-h urine collection starting at 7:00 AM for total protein and creatinine excretion estimations.A spot urine sample was collected the next day at the time of submission of a 24-h urine sample for measuring uPCR along with a blood *** data of patients were collected in a *** version 20.0 was used for statistical *** A total of 157 patients were *** mean age was 30.45±12.11 *** were 94(59.8%)males and 63(40.2%)*** mean 24-h urinary protein excretion was 3192.78±1959.79 mg and the mean spot uPCR was 3.16±1.52 in al

关键词： Glomerulopathies 24-h proteinuria Spot urinary protein-to-creatinine ratio Correlation Proteinuria Agreement

Synthesis of yttrium and cerium doped ZnO nanoparticles as highly inexpensive and stable photocatalysts for hydrogen evolution

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 Rare Earths 2021年第4期39卷 440-445页

作者： Irshad Ahmad Muhammad Shoaib Akhtar Mian Faisal Manzoor Muhammad Wajid Muhammad Noman ejaz ahmed Mukhtar Ahmad Waheed Qamar Khan Anwar M.Rana Department of Physics.Bahauddin Zakariya University Multan60800Pakistan School of Computer and Communication Lanzhou University of Technology.Lanzhou730050China Department of Physics University of Agriculture Faisalabad38040Pakistan Institute of Advanced Materials Bahauddin Zakariya UniversityMultan6800Pakistan

Yttrium and cerium co-doped ZnO nanoparticles were synthesized by combustion route and characterized using X-ray diffraction(XRD),scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET),energy dispersive spectroscopy(EDS),X-ray photoelectron spectroscopy(XPS),UV-visible diffuse reflectance spectroscopy(UV-vis DRS),photoluminescence(PL)and electrochemical impedance spectroscopy(EIS)*** introduction of yttrium ions has efficiently increased the relative percentage of Ce^(3+)ions in *** and cerium co-doped ZnO shows efficient photo activity for hydrogen evolution(10.61 mmol/((g·h))higher than previously reported optimal value for rare earth codoped ZnO *** remarkably increased hydrogen evolution can be ascribed to the synergy between electronic anchoring effect of Y^(3+)/Y^(2+)and Ce^(4+)/Ce^(3+)redox *** report presents new idea for the synthesis of efficient photocatalyst using economical route and ion anchoring *** hydrogen evolution was also tested using Na_(2)S and Na_(2)SO_(3)as electron donors under visible light *** synthesized photocatalysts also exhibit high stability.

关键词： ZnO H_(2)evolution Na_(2)SO_(3) PL Stability Rare earths

维普期刊数据库

Automated Disassembly Sequence Prediction for Industry 4.0 Using Enhanced Genetic Algorithm

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第11期69卷 2531-2548页

作者： Anil Kumar Gulivindala M.V.A.Raju Bahubalendruni R.Chandrasekar ejaz ahmed Mustufa Haider Abidi Abdulrahman Al-Ahmari Department of Mechanical Engineering Industrial Robotics and Manufacturing Automation LaboratoryNational Institute of TechnologyKariakal609609India Department of Computer Science Engineering National Institute of TechnologyKariakal609609India Raytheon Chair for Systems Engineering Advanced Manufacturing InstituteKing Saud UniversityRiyadh11421Saudi Arabia Industrial Engineering Department College of EngineeringKing Saud UniversityRiyadh11421Saudi Arabia

The evolution of Industry 4.0 made it essential to adopt the Internet of Things(IoT)and Cloud Computing(CC)technologies to perform activities in the new age of *** technologies enable collecting,storing,and retrieving essential information from the manufacturing *** collected at sites are shared with others where execution automatedly *** obtained information must be validated at manufacturing to avoid undesirable data losses during the de-manufacturing ***,information sharing from the assembly level at the manufacturing stage to disassembly at the product end-of-life state is a major *** current research validates the information optimally to offer a minimum set of activities to complete the disassembly *** optimal disassembly sequence plan(DSP)can possess valid information to organize the necessary actions in ***,finding an optimal DSP is complex because of its combinatorial *** genetic algorithm(GA)is a widely preferred artificial intelligence(AI)algorithm to obtain a near-optimal solution for the DSP *** converging nature at local optima is a limitation in the traditional *** study improvised the GA workability by integrating with the proposed priori crossover *** optimality function is defined to reduce disassembly effort by considering directional changes as *** enhanced GA method is tested on a real-time product to evaluate the *** obtained results reveal that diversity control depends on the operators employed in the disassembly *** proposed method’s solution can be stored in the cloud and shared through IoT devices for effective resource allocation and disassembly for maximum recovery of the *** effectiveness of the proposed enhanced GA method is determined by making a comparative assessment with traditional GA and other AI methods at different population sizes.

关键词： Automation internet of things disassembly sequence planning priori cross over operator enhanced GA disassembly predicates

Process Capability Indices for Shape Parameter of Weibull Distribution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Statistics 2014年第3期4卷 207-219页

作者： Suboohi Safdar ejaz ahmed College of Computer Science and Information Systems Institute of Business Management Karachi Pakistan Department of Statistics University of Karachi Karachi Pakistan

Process capability analysis is used to determine the process performance as capable or incapable within a specified tolerance. Basic indices Cp, Cpk, Cpm, Cpmk initially developed for normally distributed processes showed inappropriate for processes with non-normal distributions. A number of authors worked on non-normal distributions which were most notably those of Clements, Pearn and Chen, Montgomery and Johnson-Kotz-Pearn (JKP). Obtaining PCIs based on the parameters of non-normal distributions are completely disregarded and ignored. However parameters of some non-normal distributions have significance for knowing the status of process as capable or incapable. In this article we intend to work on the shape parameter of Weibull distribution to calculate PCIs. We work on two data sets for verification and validation purpose. Efficacy of the technique is assessed by bootstrapping the results of estimate and standard error of shape parameter.

关键词： Regression Coefficient Non-Normal Distribution Delta Method Bootstrapping

Pharmacology and biochemistry of Polygonatum verticillatum:A review

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 Coastal Life Medicine 2016年第5期4卷 406-415页

作者： Saboon Yamin Bibi Muhammad Arshad Sidra Sabir Muhammad Shoaib Amjad ejaz ahmed Sunbal Khalil Chaudhari Department of Botany PMAS Arid Agriculture UniversityRawalpindiPakistan Department of Botany Women University of Azad Jammu and KashmirBaghPakistan

Polygonatum verticillatum(Linn.)*** verticillata *** a valuable medicinal plant,distributed in the temperate Himalaya at the elevations 2400 to 2800 *** is a perennial rhizomatous herb and contains various pharmacologically important secondary metabolites among which the most important areα-bulnesene,linalyl acetate,eicosadienoic,pentacosane,piperitone,docasane,diosgenin,santonin and *** also possesses antimalarial,antipyretic,anti-inflammatory,anticonvulsant,lipoxygenase,urease inhibition,diuretic,tracheorelaxant,antidiarrheal,antispasmodic,antinociceptive,antifungal,antibacterial and bronchodilator *** plant also got importance in traditional systems of medicine due to its broad therapeutic potential especially of its *** in the past few years,over exploitation of plant parts caused the decline in the frequency of this species due to which it became threatened,endangered and vulnerable in different parts of the *** efforts are being made in certain regions of the world for both ex-situ and in-situ *** paper briefly reviewed the botanical,traditional,phytochemical,pharmacological and conservation related aspects of this plant.

关键词： Polygonatum verticillatum Solomon’s seal Threatened Pharmacology

Monitoring Oxidative Degradation of Thermally Stressed Palm Olein Shortening by Spectroscopic and Chromatographic Techniques

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Applied Sciences 2018年第12期8卷 598-606页

作者： Adnan Mujahid Saba Nazir Muhammad Hamid Raza Azeem Intisar Tajamal Hussain Ahsan Sharif ejaz ahmed Institute of Chemistry University of the Punjab Quaid-i-Azam Campus Lahore Pakistan

Deep frying with repeated use of same edible oil leads to the formation of lipid oxidation products. The presence of these oxidized products formed during frying at elevated temperature is hazardous for human health and therefore, requires prompt analysis for ensuring its fitness/quality. In this study, oxidative degradation of thermally stressed edible oils canola, sunflower and palm olein shortening was studied at 180°C ± 5°C up to 48 hours. Palm olein shortening remained stable during this period as the increase in its acid value was significantly less than canola and sunflower seed oils. The shortening samples were further studied by attenuated total reflectance Fourier transformation infrared (ATR-FTIR) and gas chromatography mass spectrometry (GC-MS) to evaluate the formation of various oxidation products due to thermal stress. ATR-FTIR indicates the formation of free fatty acids (FFAs), aldehyde groups and change in degree of unsaturation while GC-MS gives important information about profile of FFAs. The combination of these analytical techniques is useful for rapid and highly sensitive analysis of oxidized edible oil thus, ensuring its quality and fitness for safe use.

关键词： Palm Olein Shortening Oxidation ATR-FTIR GC-MS