检索结果-南通市图书馆

Enhanced photocatalytic activity of Ce-doped ZnO nanopowders synthesized by combustion method

Journal of rare Earths 2015年第3期33卷 255-262页

作者： M.Ahmad E.Ahmed Fezza Zafar n.r.khalid n.A.niaz Abdul Hafeez M.Ikram M.Ajmal Khan 洪樟连 Department of Physics Bahauddin Zakariya University State Key Laboratory of Silicon Materials Department of Materials Science & Engineering Zhejiang University Science and Technology Division University of Education

Facile and fast combustion method was used to synthesize Zn O and Ce-doped Zn O（CZO） nanocrystalline powders photocatalysts with different cerium concentrations（0.5 wt.%–10.0 wt.%） followed by calcination at 700 oC for 3 h. The prepared samples were characterized by a variety of characterization techniques such as X-ray diffraction（XrD）, scanning electron microscopy（SEM） combined with energy dispersive X-ray diffraction（EDX）, transmission electron microscopy（TEM）, UV-visible spectroscopy, BET surface area analyser and photoluminescence spectroscopy（PL）, to study the crystal structure, surface morphology, chemical composition and optical properties. It was observed from XrD results that synthesized powders had hexagonal wurtzite structure with the smallest crystallite size about 13 nm. Absorption spectra showed that cerium doping enhanced the light absorption properties towards the visible light region. Photoluminescence spectra for Ce-doped Zn O samples exhibited relatively weak near band edge（nBE） emission peaks as compared to that of pristine Zn O. The photocatalytic activities of the prepared samples were evaluated by photocatalytic degradation of rhodamine B（rh B） under UV light and visible light（λ≥420 nm） irradiation. The textile mill effluent containing organic matters was also treated under sunlight using photocatalysis and the reduction in the chemical oxygen demand（COD） of the treated effluent revealed a complete destruction of the organic molecules along with colour removal. The results showed that the CZO photocatalyst doped with 3.0 wt.% cerium exhibited four times enhanced photocatalytic activity compared to pure Zn O. The enhanced photocatalytic activity could be attributed to extended visible light absorption and inhibition of the electron-hole pair＇s recombination.

关键词： ZnO cerium combustion photocatalyst rhodamine B rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

natural Convection of a Power-Law nanofluid in a Square Cavity with a Vertical Fin

引用

Fluid Dynamics & Materials Processing 2024年第9期20卷 2091-2108页

作者： Amira M’hadbi Mohammed El Ganaoui Haïkel Ben Hamed Amenallah Guizani khalid Chtaibi LErMAB Department of Transition and Energy Efficiency ProfessionsIUT H Poincaréde LongwyUniversity of LorraineLongwy54400France LPT Center for Energy Research and Technologies(Borj Cedria2084)University of Tunis El ManarTunis1068Tunisia LTI Department of Mechanical Engineering and ProductionIUTUniversity of Picardie Jules-VerneAmiens80025France

The behavior of non-newtonian power-law nanofluids under free convection heat transfer conditions in a cooled square enclosure equipped with a heated fin is investigated *** particular,the impact of nanofluids,composed of water and Al_(2)O_(3),TiO_(2),and Cu nanoparticles,on heat transfer enhancement is *** aim of this research is also to analyze the influence of different parameters,including the rayleigh number(ra=10^(4)-10^(6)),nanoparticle volume fraction(φ=0%-20%),non-newtonian power-law indexes(n=0.6-1.4),and fin dimensions(Ar=0.3,0.5,and 0.7).Streamlines and isotherms are used to depict flow and related heat transfer *** indicate that thermal performance improves with increasing rayleigh number,regardless of the nanoparticle type or nanofluid rheological *** suggests that the buoyancy force has a significant impact on heat transfer,particularly near the heat *** nusselt number is more sensitive to variations in Cu nanoparticle volume fractions compared to Al₂O₃and TiO₂.Moreover,the average nusselt numbers for power-law nanofluids with nn>1)are greater(smaller)than for newtonian fluids due to the decrease(increase)in viscosity with increasing(decreasing)shear rate,at the same values of rayleigh number ra owing to the amplification(attenuation)of the convective ***,the most substantial enhancement is observed with Cu-water shear-thinning nanofluid,where the nusselt number increases by 136%when changing from newtonian to shear thinning behavior and by 154.9%when adding 16%nanoparticle volume ***,an even larger increase of 57%in the average nusselt number is obtained on increasing the fin length from 0.3 to 0.7.

关键词： Heat transfer nanofluid non-newtonian fluid natural convection

来源：

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

男性雄激素性脱发患者毛囊皮脂腺单位的转录组学分析显示其细胞间连接网络发生改变

引用

中华皮肤科杂志 2024年第10期57卷 967-967页

作者： Elias Bou Samra Yann Franck Mahé Mickael Le Balch nükhet Cavusoglu Pierre Bouhanna khalid Bakkar L'Oréal research and Innovation Aulnay-sous-Bois France Bouhanna Hair Transplant Clinic Paris France

随着研究的不断深入,越来越多的证据表明,脱发的发病机制涉及多种生理途径,包括引起直接损伤的炎症细胞因子和趋化因子、调节形态发生的以Wnt/β-联蛋白(catenin)为主的信号通路以及系统性炎症和脂质代谢相关通路。根据个体的遗传背景... 详细信息

随着研究的不断深入,越来越多的证据表明,脱发的发病机制涉及多种生理途径,包括引起直接损伤的炎症细胞因子和趋化因子、调节形态发生的以Wnt/β-联蛋白(catenin)为主的信号通路以及系统性炎症和脂质代谢相关通路。根据个体的遗传背景、生活方式、性别和年龄,上述效应因子和靶点先后被不同程度地激活。因此,深入解析脱发患者特异性的病理生理机制,对于制定精准的治疗方案尤为重要。

关键词：病理生理机制雄激素性脱发炎症细胞因子细胞间连接系统性炎症趋化因子脂质代谢形态发生

来源：

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

Synthesis of Tin/a-Si_3n_4 thin film by using a Mather type dense plasma focus system

引用

Chinese Physics B 2013年第5期22卷 381-385页

作者： T. Hussain r. Ahmad n. khalid Z. A. Umar A. Hussnain Center For Advanced Studies in Physics (CASP) 1-Church RoadGC University Department of Physics Government College University

A 2.3 kJ Mather type pulsed plasma focus device was used for the synthesis of a Tin/a-Si3n4 thin film at room temperature. The film was characterized using X-ray diffraction （XrD）, X-ray photoelectron spectroscopy （XPS）, scanning electron microscopy （SEM）, and atomic force microscopy （AFM）. The XrD pattern confirms the growth of polycrystalline Tin thin film. The XPS results indicate that the synthesized film is non-stoichiometric and contains titanium nitride, silicon nitride, and a phase of silicon oxy-nitride. The SEM and AFM results reveal that the surface of the synthesized film is quite smooth with 0.59 nm roughness （root-mean-square）.

关键词： plasma focus Tin/a-Si3n4 films X-ray diffraction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Caspase-cleaved cytokeratin-18 and tumour regression in gastro-oesophageal adenocarcinomas treated with neoadjuvant chemotherapy

引用

World Journal of Gastroenterology 2012年第16期18卷 1915-1920页

作者： Khaleel r Fareed Irshad n Soomro khalid Hameed Arvind Arora Dileep n Lobo Simon L Parsons Srinivasan Madhusudan Laboratory of Molecular Oncology Academic Unit of OncologySchool of Molecular Medical SciencesFaculty of Medicine and Health SciencesUniversity of Nottingham nottingham University Hospitals Nottingham NG5 1PBUnited Kingdom Department of Pathology Nottingham University HospitalsNottingham NG5 1PBUnited Kingdom Division of Gastrointestinal Surgery Nottingham Digestive Diseases CentreNIHR Biomedical Research UnitNottingham University HospitalsNottingham NG7 2UHUnited Kingdom Department of Surgery Nottingham University HospitalsNottingham NG5 1PBUnited Kingdom

AIM:To examine cytokeratin-18(CK-18) and caspasecleaved CK-18 expression in tumours and correlate with clinicopathological outcomes including tumour regression grade(TrG) ***:Formalin-fixed human gastro-oesophageal cancers were constructed into tissue *** first set consisted of 122 gastric/gastro-oesophageal cancer cases not exposed to neoadjuvant chemotherapy and the second set consisted of 97 gastric/gastrooesophageal cancer cases exposed to pre-operative platinum-based *** of CK-18 and caspase-cleaved CK-18 was investigated using ***:CK18 was commonly expressed in gastrooesophageal tumours(92.6%).Fifty-six point seven percent of tumours previously exposed to neoadjuvant chemotherapy were positive for caspase-cleaved CK-18 expression compared to only 24.6% of tumours not previously exposed to neoadjuvant chemotherapy(P = 0.009).In patients who received neoadjuvant chemotherapy,caspase-cleaved cytokeratin-18 expression correlated with favourable TrG response(TrG 1,2 or 3,P = 0.043).COnCLUSIOn:This is the largest study to date of CK-18 and caspase-cleaved CK-18 expression in gastrooesophageal *** provide the first evidence that caspase-cleaved CK-18 predicts tumour regression with neoadjuvant chemotherapy.

关键词： Tumour regression grade Gastro-oesophageal cancers Chemotherapy Full length cytokeratin-18 Caspase-cleaved cytokeratin-18

来源：

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

Ultra-high-performance liquid chromatography-quadrupole time-of-flight-mass spectrometry-characterized extract of Aerides odorata Lour alleviates paracetamol-induced hepatotoxicity in animal model evidenced by biochemical,molecular,and computational studies

引用

Animal Models and Experimental Medicine 2024年第4期7卷 497-522页

作者： A.M.Abu Ahmed Md.Atiar rahman Farjana Sharmen A.S.M.Ali reza Md.Shahidul Islam Md.Mamunur rashid Md.khalid Juhani rafi Tanvir Ahmed Siddiqui Md.Muzahid Ahmed Ezaj Srabonti Saha Md.nazim Uddin Walla Alelwani Department of Genetic Engineering and Biotechnology University of ChittagongChittagongBangladesh Department of Biochemistry and Molecular Biology University of ChittagongChittagongBangladesh Department of Pharmacy International Islami University ChittagongChittagongBangladesh Institute of Food Science and Technology Bangladesh Council of Scientific and Industrial ResearchDhakaBangladesh Department of Biochemistry College of ScienceUniversity of JeddahJeddahSaudi Arabia

Background:Many kinds of orchids have significant health benefits although ade-quate research on their biological functions is yet to be carried *** study inves-tigated the paracetamol-induced liver damage-protecting effect of epiphytic Aerides odorata methanol extract(AODE).Methods:The protective effects of AODE were studied by analyzing its effect on liver function parameters,messenger rnA(mrnA)expression,and tissue histopatho-logical *** results were confirmed by ligand-receptor interaction of molecular docking and multitarget interaction of network pharmacological ***:AODE significantly(pnimized the dose-dependent increase in acid phosphatase,aspartate aminotransferase,alanine aminotransferase,alkaline phos-phatase,γ-glutamyl transferase,lactate dehydrogenase,and total bilirubin compared to the reference drug *** level decreased,and the antioxidant genes catalase(CAT),superoxide dismutase(SOD),β-actin,paraoxonase-1(POn1),and phosphofructokinase-1(PFK-1)were upregulated in AODE-treated paracetamol-intoxicated rats.A total of 376 compounds comprising phenols and flavonoids were identified using ultra-high-performance liquid chromatography-quadrupole time-of-flight-mass spectrometry(UPLC-qTOF-MS).The online toxicity assessment using SwissADME and admetSAr exhibited drug-like,nontoxic,and potential pharmaco-logical ***,in silico analysis showed that isoacteoside,one of the identified compounds,exhibited the best docking score(−11.42)with the liver pro-tein human pituitary adenylate cyclase-1(Protein Data Bank ID:3n94).Furthermore,network pharmacology analysis identified the top 10 hub genes,namely AKT1(protein kinase B),CTnnB1(catenin beta-1),SrC(proto-oncogene c-Src),TnF(tumor necrosis factor),EGFr(epidermal growth factor receptor),HSP90AA1(heat shock protein 90α),MAPK3(mitogen-activated protein kinase 3),STAT3(signal transducer and activator of transcription 3),CASP3(caspase protein),

关键词： Aerides odorata animal model mrnA expression PCM-induced hepatotoxicity UPLC-qTOF-MS

来源：

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

Medical research during the COVID-19 pandemic

引用

World Journal of Clinical Cases 2020年第15期8卷 3156-3163页

作者： khalid Alnaamani Siham AlSinani Alan n Barkun Division of Gastroenterology Department of Internal MedicineArmed Forces HospitalMuscat 999046Oman Graduate Medical Education Department and Department of Child Health Sultan Qaboos University HospitalMuscat 999046Oman Division of Gastroenterology McGill University and the McGill University Health CentreMontreal H3G1A4Canada

The current pandemic of coronavirus disease 2019(COVID-19)which was first detected in Wuhan,China in December 2019 is caused by the novel coronavirus named severe acute respiratory syndrome coronavirus-2(SArS-CoV-2).The virus has quickly spread to a large number of countries leading to a great number of ***,till today there is no specific treatment or vaccination for *** of the suggested treatment medications are based on in vitro laboratory investigations,experimental animal models,or previous clinical experience in treating similar viruses such as SArS-CoV-1 or other retroviral *** running of any clinical trial during a pandemic is affected at multiple *** for this include patient hesitancy or inability to continue investigative treatments due to self-isolation/quarantine,or limited access to public places(including hospitals).Additional barriers relate to health care professionals being committed to other critical tasks or quarantining themselves due to contact with COVID-19 positive *** best research approaches are those that adapt to such external unplanned *** clinical trials before COVID-19 pandemic have the potential for identifying important therapies in the long-term if they can be completed as ***,these clinical trials may require modifications due a pandemic such as this one to ensure the rights,safety,and wellbeing of participants as well as medical staff involved in the conduction of clinical *** trials initiated during the pandemic must be time-efficient and flexible due to high contagiousness of severe acute respiratory syndrome coronavirus 2,the significant number of reported deaths,and time constraints needed to perform high quality clinical trials,enrolling adequate sample *** between different countries as well as implementation of innovative clinical trial designs are essential to successfully complete such initiatives during the cur

关键词： SArS-CoV-2 COVID-19 Pandemic research Clinical trials

来源：

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

DFT investigation of half-metallic ferromagnetic rare earth based spinels MgHo_(2)Z_(4)(Z=S,Se)

引用

Journal of rare Earths 2024年第1期42卷 121-128,I0005页

作者： Maiza Zanib Mumtaz Manzoor n.A.noor M.Waqas Iqbal Mazia Asghar H.H.Hegazy A.Laref Department of Physics Riphah International UniversityLahore CampusPakistan research Centre for Advanced Materials Science King Khalid UniversityP.O.Box 9004AbhaSaudi Arabia Department of Physics Faculty of ScienceKing Khalid UniversityP.O.Box 9004AbhaSaudi Arabia Department of Physics and Astronomy College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

Half-metallic ferromagnetism,mechanical as well as thermoelectric properties for rare earth-based spinels MgHo_(2)Z_(4)(Z=S,Se)were investigated using density functional theory(DFT).Structural optimization was done with Perdew-Burke-Ehrenzorf(PBE)sol-generalized gradient approximation(GGA)to calculate the lattice constant of both spinels comparable to experimental *** addition,Born stability criteria and negative formation energy show that our studied spinels are also structurally and dynamically stable in the cubic *** ferromagnetic(FM)state stability,we also calculated the energy differences among FM,antiferromagnetic(AFM),and non-magnetic(nM)***,Curie temperatures of ferromagnetic phases were also *** used Trans-Blaha improved BeckeJohnson(TB-mBJ)potential functional for electronics as well as magnetic characteristics,which lead to the consistent explanation of half-metallic ferromagnetism,representing the whole band-occupancy in material with exact detail of density of states(DOS).The stable FM state was examined in spinels due to the exchange splitting of Ho cation consisting of p-d hybridizations compatible with the result achieved for electronics band structure and ***,spin magnetic moment was explained in terms of anion,cation,and sharing charge on studied *** addition,the calculated thermoelectric properties clearly show that operation range of these systems may be utilized by future experimental works for identifying the potential applications of these systems.

关键词： Ho-based spinels DFT simulations Mechanical parameters Electronic properties HM ferromagnetism Figure of merit

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

FirstPrincipleCalculations of the Ground and Excited State Properties of rbPbF_(3)

引用

Chinese Physics Letters 2013年第9期30卷 128-131页

作者： Hayatullah G.Murtaza r.Khenata S.naeem M.n.khalid S.Mohammad Materials Modeling Lab Hazara UniversityMansehraPakistan Materials Modeling Lab Department of PhysicsIslamia College UniversityPeshawarPakistan LPQ3M Laboratory Institute of Science and TechnologyUniversity of MascaraAlgeria Department of Physics and Astronomy King Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia

Structural,elastic,electronic,chemical bonding and optical properties of the cubic rbPbF 3 compound under pres-sure are studied using a highly accurate state-of-the-art full potential linearized augmented plane wave *** exchange correlation effects are included through the generalized gradient and modified Becke–Johnson ex-change *** lattice constant and band gap of the cubic rbPbF 3 decreases with enhanced *** 3 is brittle,elastically anisotropic,and a direct bandgap *** optical properties such as refractive index𝑜(ω),extinction coefficient𝑙(ω),reflectivity𝑆(ω),and optical conductivity𝜏(ω)are predicted.

关键词： potential. material. method.

来源：

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

Ahmadea dalanensis *** ***.,an edible truffle from Pakistan

引用

Studies in Fungi 2020年第1期5卷 452-461页

作者： Aman n khalid An Moncalvo JM Department of Botany University of the PunjabLahorePakistan Department of natural History Royal Ontario MuseumTorontoONCanada Department of Ecology and Evolutionary Biology University of TorontoTorontoONCanada

Ahmadea,a monotypic truffle genus is described morphologically and its position in the family Pezizaceae(Pezizales,Ascomycota)is inferred from the phylogenetic analyses of DnA sequences obtained from the large subunit nuclear ribosomal rnA gene(LSU).Its type species,***,is found in arid and semi-arid regions of Punjab,Pakistan,often occurring in Sorghum vulgare crop fields where it has been known for its edibility for *** of Ahmadea with the related truffle genera Stouffera Kovács&Trappe,Temperantia ***,Healy&Kovács,Hydnobolites Tul.&*** Delastria Tul.&*** discussed in this paper.

关键词： Ascomycota ITS paralogues LSU Pezizaceae Pezizales Sorghum Taxonomy

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：