检索结果-南通市图书馆

synthesis and characterization of rare earth metal doped tungsten trioxide photocatalyst for degradation of Rhodamine B dye

引用

稀土学报:英文版 2023年第9期41卷 1302-1310,I0002页

作者： Pooja Nehra Amita Khatri Anil Kumar satyendra singh Pawan s.Rana Department of Physics Deenbandhu Chhotu Ram University of Science and TechnologyMurthal1339SonipatHaryanaIndia special Centre for Nanoscience Jawaharlal Nehru University New Delhi10067India

Nowadays,it is concern for researchers that due to high recombination rate of photogenerated charge carriers in tungsten trioxide(WO_(3)) nanoparticles,the future applications are limited in the field of *** we attempt to synthesize tungsten trioxide nanoparticles with different doping concentrations of lanthanum i.e.2 wt%,4 wt%,6 wt% and 8 wt%.The synthesized samples were characterized by using various characterization techniques:X-ray diffraction(XRD),Raman spectroscopy,Fourier transform infrared spectroscopy(FTIR),photoluminescence spectra(PL),transmission electron microscopy(TEM),energy dispersive X-ray(EDX) and UV-Vis ***_(3) retains its monoclinic structure even after doping which was confirmed by XRD *** helps to descry functional groups present in the *** size of nanoparticles was calculated by using *** confirms the absence of any impurity in the synthesized *** spectroscopy confirms the presence of a large number of imperfections induced in the lattice of WO_(3).The rate of recombination was analyzed by photoluminescence(PL) spectroscopy and is minimum in 4 wt% doping of *** optical bandgap was calculated using UV-Vis spectroscopy and becomes narrow along with the doping ***,it is found that doping of La in WO_(3) has considerably ameliorate the photocatalytic activity by reducing rate of recombination due to the trapping of electrons by defects introduced in the *** decolorization of Rhodamine B(RhB) dye was performed and the values of c/c_0 and rate constant(k) confirm that the 4 wt% doping shows maximum degradation *** kinetic study for photodegradation of Rhodamine B was done by using various kinetic models and results show that the reaction follows first order kinetics very ***,optimum doping of lanthanum increases the decolorization ability of WO_(3) towards RhB dye.

关键词： Photocatalytic activity WO_(3)nanoparticles Rhodamine B dye Rare earth doping Visible light

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

Targeting PP2A for cancer therapeutic modulation

引用

Cancer Biology & Medicine 2022年第10期19卷 1428-1439页

作者： Halle Ronk Jared s.Rosenblum Timothy Kung Zhengping Zhuang Neuro-Oncology Branch National Cancer InstituteNational Institutes of HealthBethesdaMD 20892USA

Protein phosphatases play essential roles as negative regulators of kinases and signaling cascades involved in cytoskeletal *** phosphatase 2A(PP2A)is highly conserved and is the predominant serine/threonine phosphatase in the nervous system,constituting more than 70%of all neuronal ***2A is involved in diverse regulatory functions,including cell cycle progression,apoptosis,and DNA *** PP2A has historically been identified as a tumor suppressor,inhibition of PP2A has paradoxically demonstrated potential as a therapeutic target for various ***100,a water-soluble,small-molecule competitive inhibitor of PP2A,has shown particular promise as a chemo-and radio-sensitizing *** success has led to a profusion of clinical trials on LB100 adjuvant therapies,including a phase I trial in extensive-stage small-cell lung cancer,a phase I/II trial in myelodysplastic syndrome,a phase II trial in recurrent glioblastoma,and a completed phase I trial assessing the safety of LB100 and docetaxel in various relapsed solid ***,we review the development of LB100,the role of PP2A in cancer biology,and recent advances in targeting PP2A inhibition in immunotherapy.

关键词： Chemo-sensitization clinical trials colorectal cancer glioblastoma immunotherapy LB100 protein phosphatase 2A PP2A inhibition radio-sensitization small molecule inhibitor

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

Electrospun Nanofibrous Adsorption Membranes for Wastewater Treatment:Mechanical strength Enhancement

引用

Chemical Research in Chinese Universities 2021年第3期37卷 355-365页

作者： XIN Rui MA Hongyang shyam Venkateswaran Benjamin s.Hsiao state Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China Department of Chemistry Stony Brook UniversityStony BrookNY117943400USA

Functional nanofibrous membranes fabricated by electrospinning technology have attracted much attention in the removal of heavy metal ions from contaminated *** high specific surface area,high porosity and ease of functionality create an enhanced throughput and high adsorption capacity of the nanofibrous ***,the relatively poor mechanical properties of the membrane with a non-woven nanofibrous structure are one of the major concerns,which can limit the applications in wastewater *** strategies and methodologies were explored to address the problems and were reviewed in this work,highlighting the possibilities of overcoming the poor mechanical properties of the nanofibrous membrane and to ensure the recyclability and reusability of the membrane during the adsorption process.

关键词： Electrospun nanofibrous membrane Mechanical property Heavy metal ion Wastewater treatment

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

Influence of parameters on the microstructure of a duplex stainless steel joint welded by a GMAW welding process

引用

Progress in Natural science:Materials International 2022年第4期32卷 415-423页

作者： sandra Chacón-Fernández Antonio Portolés García Gerardo Romaní Labanda Universidad Politécnica de Madrid Escuela Técnica Superior de Ingenieros Industriales UPM

Duplex stainless steels（Dsss） are widely used in industry for their desirable properties. Any fusion welding technique modifies the microstructure and, consequently, the properties of the material. This paper presents a parametric study of the variables that determine the energy contribution（current, voltage and welding speed） and the structural modifications produced during gas metal arc welding. The analysis comprises metallographic study,phase balance, dimensioning of the weld beads and tensile and hardness tests. The influence of the variables studied on the thermal cycles obtained（temperatures reached and cooling rate） was determined by using a finite element model. The results showed that, in addition to the indicated parameters, the parameter power transfer per volume（W/m3） and the geometry in the bead must be controlled due to their influence on the heat flow distribution and phase balance.

关键词： Welding Heat input GMAW Duplex stainless steels (Dss) Finite element model (FEM)

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Application of fuzzy logic for determining of coal mine mechanization

引用

Journal of Coal science & Engineering(China) 2012年第3期18卷 225-231页

作者： HOssEINI s AA ATAEI M HOssEINI s M AKHYANI M Department of mining Shahrood BranchIslamic Azad UniversityShahroodIran Faculty of Mining Petroleum and GeophysicsShahrood University of TechnologyShahroodIran

The fundamental task of mining engineers is to produce more coal at a given level of labour input and material costs, for optimum quality and maximum efficiency. To achieve these goals, it is necessary to automate and mechanize mining operations. Mechanization is an objective that can result in significant cost reduction and higher levels of profitability for underground mines. To analyze the potential of mechanization, some important factors such as seam inclination and thickness, geological disturbances, seam floor conditions and roof conditions should be considered. In this study we have used fuzzy logic, membership functions and created fuzzy rule-based methods and considered the ultimate objective： mechanization of mining. As a case study, the mechanization of the Tazare coal seams in shahroud area of Iran was investigated. The results show a low potential for mechanization in most of the Tazare coal seams.

关键词： fuzzy logic mechanization coal seams productivity fuzzytech software

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

Deep convolutional neural network models for weed detection in polyhouse grown bell peppers

引用

Artificial Intelligence in Agriculture 2022年第1期6卷 47-54页

作者： A.subeesh s.Bhole K.singh N.s.Chandel Y.A.Rajwade K.V.R.Rao s.P.Kumar D.Jat ICAR-Central Institute of Agricultural Engineering(CIAE) BhopalMadhya PradeshIndia

Conventional weed management approaches are inefficient and non-suitable for integration with smart agricultural *** identification and classification of weeds can play a vital role in weed management contributing to better crop *** and smart spot-spraying system's efficiency relies on the accuracy of the computer vision based detectors for autonomous weed *** the present study,feasibility of deep learning based techniques(Alexnet,GoogLeNet,InceptionV3,Xception)were evaluated in weed identification from RGB images of bell pepper *** models were trained with different values of epochs(10,20,30),batch sizes(16,32),and hyperparameters were tuned to get optimal *** overall accuracy of the selected models varied from 94.5 to 97.7%.Among the models,InceptionV3 exhibited superior performance at 30-epoch and 16-batch size with a 97.7%accuracy,98.5%precision,and 97.8%*** this Inception3 model,the type 1 error was obtained as 1.4%and type II error was 0.9%.The effectiveness of the deep learning model presents a clear path towards integrating them with image-based herbicide applicators for precise weed management.

关键词： Bell pepper Computer vision Convolutional neural networks Deep learning Weed identification

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

Human sperm motility stimulating activity of a sulfono glycolipid isolated from sri Lankan marine red alga Gelidiella acerosa

引用

Asian Journal of Andrology 2001年第1期3卷 27-31页

作者： G.A.s.Premakumara W.D.Ratnasooriya L.M.V.Tillekeratne A.s.Amarasekare Atta-Ur-Rahman Natural Products Development Group Industrial Technology Institute(CISIR) Colombo 7 Sri LankaDepartment of Zoology Uuiversity of Colombo Colombo 03 Sri LankaChemistry University of Colombo Colombo 03 Sri LankaChemistry University of Colombo Colombo 03 Sri LankaHEJ Research Institute of Chemistry University of Karachi Karachi 32 Pakistan

Aim: To evaluate the sperm motility stimulating activity of a sulfono glycolipid (s-ACT-1) isolated from Gelidiellaacerosa, a sfi Lankan marine red algae. Methods: s-ACT-I, a white amorphous powder was separated from morepolar fractions of the hexane soluble of 1:1 CH_2Cl_2/MeOH extract and subjected to ~1H, ^(13)C NMR and IR spectroscopyafter reverse phase HPLC for identification. Effects of s-ACT-1 on human sperm motility was assessed in vitro at 10,100 and 1000μg/mL concentrations at 37℃ for 0, 5, 15, 30 and 60 min. Results: s-ACT-1 was identified as aglycolipid sulfate. The lower dose increased the sperm motility slightly, whilst the medium dose significantly increasedthe motility (P stimulant effect was sustainedthroughout the experimental period. Furthermore, the medium dose rendered 80% of the immotile viable sperm *** contrast, the highest dose impaired the sperm motility. The sperm stimulating activity of s-ACT-1 was dose-depen-dent and had a bell-shaped dose response curve for all the 5 incubation periods. Conclusion: s-ACT-1 of Gelidiellaacerosa is a sulfono glycolipid. s-ACT-1 has a potent sperm motility stimulating activity in vitro and has the potentialto be developed into a sperm stimulant. (Asian J Androl 2001 Mar; 3: 27-31)

关键词： sperm motility stimulants reproduction sulfono glycolipids red alga Gelidiella acerosa

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

Investigation of rock salt layer creep and its effects on casing collapse

引用

International Journal of Mining science and Technology 2020年第3期30卷 357-365页

作者： s.Reza Taheri Ali Pak saeed shad Behzad Mehrgini Meisam Razifar Civil Engineering Department Sharif University of TechnologyTehranIran Upstream Petroleum Research Institute Sharif University of TechnologyTehranIran Chemical and Petroleum Engineering Department Sharif University of TechnologyTehranIran Kish Petroleum Engineering Company TehranIran Folowrd Industrial Projects Company TehranIran

Casing collapse is one of the costly incidents in the oil industry. In the oil fields of southwest Iran, most casing collapses have occurred in Gachsaran formation, and the halite rock salt layer in this formation may be the main cause for these incidents because of its peculiar creep behavior. In this research, triaxial creep experiments have been conducted on Gachsaran salt samples under various temperatures and differential stresses. The main purpose was to determine the creep characteristics of Gachsaran rock salt,and to examine the role of creep in several casing collapses that occurred in this formation. Results indicated that the halite rock salt of Gachsaran formation basically obeys the power law;however, its creep parameters are quite different from other halite rocks elsewhere. The time-dependent creep of Gachsaran rock salt exhibits strong sensitivity to temperature change;however, its sensitivity to variation of differential stress is rather low. The numerical simulation of the rock salt creep in a real oil well demonstrated the importance of creep and reservoir conditions on the safety factor of the tubing related to casing collapse.

关键词： Rock salt Gachsaran formation Creep Power law Casing collapse Numerical simulation

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

Experimental study of the Atomic and Molecular Processes Related to Plasma Detachment in steady-state Divertor simulator MAP-Ⅱ

引用

Plasma science and Technology 2004年第5期6卷 2451-2455页

作者： s.Kado s.Kajita Y.Iida B.Xiao T.shikama D.Yamasaki T.Oishi s.Taraka High Temperature Plasma Center The University of Tokyo2-11-16 YayoiBunkyo-kuTokyo 113-8656 JapanGraduate School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo1138656 JapanGraduate School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo1138656 JapanHigh Temperature Plasma CenterThe University of Tokyo2-11-16 YayoiBunkyo-kuInstitute of Plasma PhysicsChinese Academy of SciencesHefei 230031ChinaGraduateGraduateGraduateGraduate School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo113-8656 JapanSchool of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo113-8656 JapanSchool of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo113-8656 JapanSchool of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo113-8656 Japan

Atomic and molecular processes relevant to the volumetric recombinationphenomena were investigated in a linear divertor plasma simulator MAP-Ⅱ. Volumetric recombinationis induced in He plasma by puffing of He or H_2. In the He puffing case, the reduction of the ionflux is dominated by the electron-ion recombination. In the H_2 puffing case, however, it isdominated by the molecule-assisted recombination (MAR), which is characterized by the disappearanceof the Helium Rydberg spectra and by the existence of the hydrogen negative ions. Currentachievement and the future prospect are described.

关键词： divertor plasma simulator MAP-Ⅱ molecular assisted recombination heliumrydberg spectra

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

Theoretical study of elastic, mechanical and thermodynamic properties of MgRh intermetallic compound

引用

Journal of Magnesium and Alloys 2014年第1期2卷 59-63页

作者： s.Boucetta UniversitésETIF 1 Laboratoire d'Elaboration de Nouveaux Matériaux et Caractérisations(ENMC)Département de Physique19000 SétifAlgeria

In the last years,Magnesium alloys are known to be of great technological importance and high scientific *** this work,density functional theory plane-wave pseudo potential method,with local density approximation(LDA)and generalized gradient approximation(GGA)are used to perform first-principles quantum mechanics calculations in order to investigate the structural,elastic and mechanical properties of the intermetallic compound MgRh with a CsCl-type *** of the calculated equilibrium lattice constant and experimental data shows good *** elastic constants were determined from a linear fit of the calculated stress-strain function according to Hooke's *** the elastic constants,the bulk modulus B,shear modulus G,Young's modulus E,Poisson's ratioσ,anisotropy factor A and the ratio B/G for MgRh compound are *** sound velocities and Debye temperature are also predicted from elastic ***,the linear response method has been used to calculate the thermodynamic *** temperature dependence of the enthalpy H,free energy F,entropy s,and heat capacity at constant volume C_(v)of MgRh crystal in a quasi-harmonic approximation have been obtained from phonon density of states and discussed for the first *** is the first quantitative theoretical prediction of these properties.

关键词： Intermetallics Elastic properties Mechanical properties Thermodynamic properties Computer simulations

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：