检索结果-南通市图书馆

A comprehensive study on the processing of Co:ZnO nanostructured ceramics:Defect chemistry engineering and grain growth kinetics

引用

Journal of materials Science & Technology 2023年第7期138卷 221-232页

作者： R.T.da Silva J.m.morbec G.rahman H.B.de Carvalho Universidade Federal de Ouro Preto-UFOP Ouro PretoMG 35400-000Brazil School of Chemical and Physical Sciences Keele UniversityKeele ST55BGUnited Kingdom Department of Physics Quaid-i-Azam UniversityIslamabad 45320Pakistan Universidade Federal de Alfenas-UNIFAL Alfenas 37130-000Brazi

In this report,we present a systematic study on the preparation of Co:ZnO ceramics via a standard solid-state route from different Co precursors(Co_(3)O_(4),CoO,and metallic Co)and atmospheres(O_(2)and Ar).Particular emphasis is given to defect chemistry engineering and the sintering growth ***-principles calculations based on density functional theory are employed to determine the formation en-ergy of the main point defects in ZnO and Co:ZnO *** on the theoretical results,a set of chemical reactions is *** microstructural characterization is also performed to determine the degree of Co incorporation into the ZnO *** samples prepared in Ar atmosphere and metal-lic Co present the highest Co solubility limit(lower apparent Co incorporation activation energy)due to the incongruent ZnO *** of the parameters of the sintering growth kinetics reveals that Co_(3)O_(4)is the best sintering additive to achieve larger grain sizes,and possible higher densi-ties,in both sintering atmospheres,while metallic Co is the best to achieve the smallest grain size with higher Co concentration and homogeneous spatial distribution for a subsequent reduction of *** results show that the sintering in O_(2)effectively promotes zinc vacancies in the ZnO structure,while the sintering in Ar promotes zinc interstitial *** findings contribute to understanding the preparation of Co-doped ZnO ceramics and the sintering growth kinetics,which may improve the state of the art in processing the material at both bulk and nanometric scales.

关键词： multifunctionality Zinc oxide Defect engineering Growth kinetics

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

Effect of different additives on the phase separation behavior and thermodynamics of p-tert-alkylphenoxy poly (oxyethylene) ether in absence and presence of drug

引用

Chinese Journal of Chemical Engineering 2018年第5期26卷 1110-1118页

作者： marzia rahman md. Anamul Hoque mohammed Abdullah Khan malik Abdul Rub Abdullah m. Asiri Department of Chemistry Jahangirnagar University Savar Dhaka 1342 Bangladesh Chemistry Department Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia Center of Excellence for Advanced materials Research King Abdulaziz UniversityJeddah 21589 Saudi Arabia

Cloud point （CP） determinations of 4-（1,1,3,3-tetramethylbutyl）phenyl-polyethylene glycol （TX-100 （nonionic surfactant）） was carried out in aqueous as well as in the attendance of drug （ceftriaxone sodium trihydrate （CFT））/（CFT ＋ different inorganic salts） and discussed thoroughly. Nonionic surfactants are employed exten- sively in different formulations. In aqueous solution, the values of CP of TX-100 are obtained to increase by means of enhancing of their concentration in the solution. The CP values of TX-100 solutions were found to de- crease in the presence of drug and their values decrease more with rising concentrations of the drug. The values of CP of CFT and TX-100 mixtures were found to further decrease in the attendance of inorganic salts in compar- ison to their absence. The effect of different sodium salts in decreasing CP values of TX-100 was achieved in the following order： NaCO3 〉 Na2SO4 〉 NaCl. However, in the case of potassium and ammonium salts, the decreasing order obtained is K2SO4 〉 KCO3 〉 KCI and （NH4）2SO4 〉 Na2CO3 〉 NH4Cl respectively. Various thermodynamic pa- rameters for example standard free energy （△G c）, standard enthalpy （△H c） as well as standard entropy （△S c） changes of phase separation were also evaluated and discussed in detail on the basis of their behavior.

关键词： Cloud point TX-100 Ceftriaxone sodium trihydrate Inorganic salts Thermodynamic parameters

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

Absorbed dose estimations of ^(131)I for critical organs using the GEANT4 monte Carlo simulation code

引用

Chinese Physics C 2012年第11期36卷 1150-1156页

作者： Ziaur rahman Shakeel ur Rehman Waheed Arshed Nasir m mirza Abdul Rashid Jahan Zeb Health Physics Division Pakistan Institute of Nuclear Science & TechnologyNiloreIslamabad 45650Pakistan Department of Physics & Applied mathematics Pakistan Institute of Engineering & Applied SciencesNiloreIslamabad 45650Pakistan

The aim of this study is to compare the absorbed doses of critical organs of 131I using the mIRD （medical Internal Radiation Dose） with the corresponding predictions made by GEANT4 simulations. S- values （mean absorbed dose rate per unit activity） and energy deposition per decay for critical organs of 131I for various ages, using standard cylindrical phantom comprising water and ICRP soft-tissue material, have also been estimated. In this study the effect of volume reduction of thyroid, during radiation therapy, on the calculation of absorbed dose is also being estimated using GEANT4. Photon specific energy deposition in the other organs of the neck, due to 131I decay in the thyroid organ, has also been estimated. The maximum relative difference of mIRD with the GEANT4 simulated results is 5.64% for an adult＇s critical organs of 131I. Excellent agreement was found between the results of water and ICRP soft tissue using the cylindrical model. S-values are tabulated for critical organs of 131I, using 1, 5, 10, 15 and 18 years （adults） individuals. S-values for a cylindrical thyroid of different sizes, having 3.07% relative differences of GEANT4 with Siegel ＆ Stabin results. Comparison of the experimentally measured values at 0.5 and 1 m away from neck of the ionization chamber with GEANT4 based monte Carlo simulations results show good agreement. This study shows that GEANT4 code is an important tool for the internal dosimetry calculations.

关键词： mean absorbed dose rate GEANT4 monte Carlo simulation and 131I critical organs

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

Stable Fano-like plasmonic resonance: its impact on the reversal of far-and near-field optical binding force

引用

Communications in Theoretical Physics 2020年第4期72卷 89-105页

作者： Hamim mahmud Rivy m R C mahdy Nabila masud Ziaur rahman Jony Saikat Chandra Das Department of Electrical&Computer Engineering North South UniversityBashundharaDhaka1229Bangladesh School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang Ave639798 Singapore Pi Labs Bangladesh LTD ARA Bhaban39Kazi Nazrul Islam AvenueKawran BazarDhaka 1215Bangladesh

Even for a 100 nm interparticle distance or a small change in particle shape,optical Fano-like plasmonic resonance mode usually vanishes *** would be remarkable if stable Fano-like resonance could somehow be achieved in distinctly shaped nanoparticles for more than 1μm interparticle distance,which corresponds to the far electromagnetic field *** such far-field Fano-like plasmonic resonance can be achieved,controlling the reversal of the far-field binding force can be attained,like the currently reported reversals for near-field *** this work,we have proposed an optical set-up to achieve such a robust and stable Fano-like plasmonic resonance,and comparatively studied its remarkable impact on controlling the reversal of near-and far-field optical binding *** our proposed set-up,the distinctly shaped plasmonic tetramers are half immersed(***-benzene)in an inhomogeneous dielectric interface and illuminated by?circular?polarized *** have demonstrated significant differences between near-and far-field optical binding forces along with the Lorentz force field,which partially depends on the object’s shape.A clear connection is shown between the far-field binding force and the resonant modes,along with a generic mechanism to achieve controllable Fano-like plasmonic resonance and the reversal of the optical binding force in both far-and near-field configurations.

关键词： Fano resonance optical binding force Lorentz force plasmonic tetramer

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

Harnessing LSTm Classifier to Suggest Nutrition Diet for Cancer Patients

引用

Intelligent Automation & Soft Computing 2023年第2期35卷 2171-2187页

作者： S.Raguvaran S.Anandamurugan A.m.J.md.Zubair rahman Department of Computer Science and Engineering Al-Ameen Engineering CollegeErode638115India Department of Information and Technology Kongu Engineering CollegeErode638060India Al-Ameen Engineering College Erode638115India

A customized nutrition-rich diet plan is of utmost importance for cancer patients to intake healthy and nutritious foods that help them to be strong enough to maintain their body weight and body *** nutrition-rich diet foods will prevent them from the side effects caused before and after treatment thereby minimizing *** work is proposed here to provide them with an effec-tive diet assessment plan using deep learning-based automated medical diet ***,an Enhanced Long-Short Term memory(E-LSTm)has been proposed in this paper,especially for cancer *** proposed method will be very useful for cancer patients as this would help them predict the foods which can be consumed by them based on the nutrition analysis of food *** classiﬁcation will be performed in E-LSTm by analyzing the two datasets,one with food images and another with cancer patients’*** an in-depth analysis of the major research papers concerning deep learning strategies to iden-tify the foods along with their nutrition composition,this method has been iden-tiﬁed as one of theﬁnest deep learning approaches that are used for classiﬁcation *** work has been identiﬁed as theﬁrst work producing a new layer for feature extraction and providing nutrition suggestions,especially for cancer patients using the LSTm *** accuracy of prediction and classiﬁcation will be improved by the dedicated layer for feature extraction in ***,it is proved that this proposed method outperforms all other existing techniques in terms of F1 Score,Precision,Recall,Classiﬁcation accuracy,Training loss and Validation loss.

关键词： Classiﬁcation diet assessment enhanced long short term memory nutrition suggestion

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

TGF-β/BmP signaling and other molecular events: regulation of osteoblastogenesis and bone formation

引用

Bone Research 2015年第1期3卷 11-30页

作者： md Shaifur rahman Naznin Akhtar Hossen mohammad Jamil Rajat Suvra Banik Sikder m Asaduzzaman Tissue Banking and Biomaterial Research Unit Atomic Energy Research Establishment Lab of Network Biology Biotechnology and Genetic Engineering DisciplineKhulna University

Transforming growth factor-beta（TGF-β）/bone morphogenetic protein（BmP） plays a fundamental role in the regulation of bone organogenesis through the activation of receptor serine/threonine kinases. Perturbations of TGF-β/BmP activity are almost invariably linked to a wide variety of clinical outcomes, i.e., skeletal, extra skeletal anomalies, autoimmune, cancer, and cardiovascular diseases. Phosphorylation of TGF-β（I/II） or BmP receptors activates intracellular downstream Smads, the transducer of TGF-β/BmP signals. This signaling is modulated by various factors and pathways, including transcription factor Runx2. The signaling network in skeletal development and bone formation is overwhelmingly complex and highly time and space ***, positive, negative, or synergistic effects are observed when TGF-β/BmP interacts with the pathways of mAPK, Wnt, Hedgehog（Hh）, Notch, Akt/m TOR, and mi RNA to regulate the effects of BmP-induced signaling in bone dynamics. Accumulating evidence indicates that Runx2 is the key integrator, whereas Hh is a possible modulator, mi RNAs are regulators, and b-catenin is a mediator/regulator within the extensive intracellular network. This review focuses on the activation of BmP signaling and interaction with other regulatory components and pathways highlighting the molecular mechanisms regarding TGF-β/BmP function and regulation that could allow understanding the complexity of bone tissue dynamics.

关键词： BmP signaling and other molecular events bone regulation of osteoblastogenesis and bone formation TGF

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

multi-functional pharmacological credence of triterpenoid 16-hydroxy betulinic acid isolated from mikania cordata

引用

中国药理学与毒理学杂志 2018年第4期32卷 253-254页

作者： m. Oliur rahman Shah Alam SIDDIQUI Atiqur rahman mohammad Ahsanul AKBAR mohammad Ajmal ALI Department of Botany University of Dhaka Dhaka 1000 Bangladesh Department ofApplied Chemistry and Chemical Engineering Islamic University Kushtia 7003 Bangladesh Department of Clinical Pharmacy and Pharmacology University of Dhaka Dhaka 1

OBJECTIVE To isolate and characterize bioactive compound from traditionally important medicinal plant mikania cordata,and to investigate muti-faced pharmacological activities of the isolated *** A triterpeenoid,16-hydroxy betulinic acid(16 HBA) was isolated from mikania cordata leaf and the structure of the compound was determined by NmR spectroscopic *** activity of 16 HBA was tested by disc diffusion method and minimum inhibitory concentration(mIC) against the tested microorganisms was *** analgesic property of 16 HBA was tested using acetic acid-induced writhes in mice and hot plate thermal stimulation in *** anti-inflammatory activity was studied using carrageenin-induced paw edema *** antipyretic potential of 16 HBA was evaluated by using yeast-induced hyperthermia in *** The triterpenoid 16 HBA showed potent antibacterial activity with inhibition zone of diameter ranging from 12.0~17.5 mm and antifungal activity with mycelial growth inhibition ranges from 37.6%~54.5%.The mIC values for antibacterial and antifungal activities ranged from 31.5~125 and 250~1000 μg·mL-1 *** compound(50 and100 mg·kg^(-1) body weight) showed potent peripheral and central analgesic activity having 55.19% and41% of writhing inhibition at 90 min after administration of the compound and the highest 55.98%,79.18% elongation of reaction time,*** anti-inflammatory activity screening,the compound(100 mg·kg^(-1)) revealed the highest 77.08% edema inhibition at 4 h after administration of *** antipyretic assay,16 HBA exhibited a strong antipyretic effect in yeast-induced *** The present study confirmed that 16-hydroxy betulinic acid isolated from mikania cordata has potent antimicrobial,analgesic,anti-inflammatory and antipyretic *** results can be seen as scientific support for the traditional and folklore usage of mikania cordata in Bangladesh for the treatment of differen

关键词：药用植物薇甘菊活性化学物药物分析

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

Effect of Al Doping on Structural, Electrical, Optical and Photoluminescence Properties of Nano-Structural ZnO Thin Films

引用

Journal of materials Science & Technology 2012年第4期28卷 329-335页

作者： m. mozibur rahman m.K.R. Khan m. Rafiqul Islam m.A. Halim m. Shahjahan m.A. Hakim Dilip Kumar Saha Jasim Uddin Khan Department of Physics University of Rajshahi Rajshahi 6205 Bangladesh materials Science Division Atomic Energy Centre Dhaka Bangladesh Industrial Physical Division BCSIR Dhaka Bangladesh

The nano-structural Al-doped ZnO thin films of different morphologies deposited on glass substrate were successfully fabricated at substrate temperature of 350 ℃ by an inexpensive spray pyrolysis method. The structural, electrical, optical and photoluminescence properties were investigated. X-ray diffraction study revealed the crystalline wurtzite （hexagonal） structure of the films with nano-grains. Scanning electron microscopy （SEm） micrographs indicated the formation of a large variety of nano-structures during film growth. The spectral absorption of the films occurred at the absorption edge of -410 nm. In the present study, the optical band gap energy 3.28 eV of ZnO decreased gradually to 3.05 eV for 4 mol% of AI doping. The deep level activation energy decreased and carrier concentrations increased substantially with increasing doping. Exciting with the energy 3.543 eV （A=350 nm）, a narrow and a broad characteristic photoluminescence peaks that correspond to the near band edge （NBE） and deep level emissions （DLE）, respectively emerged.

关键词： Thin film Nano-structure ZnO Surface morphology Photolumlnescence

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

Antioxidant and Cytotoxic Activities of A Novel Isomeric molecule(PF5)Obtained from methanolic Extract of Pleurotus Florida mushroom

引用

Journal of Bioresources and Bioproducts 2021年第4期6卷 338-349页

作者： D.menaga Pattanathu K.S.m.rahman S.Rajakumar P.m.Ayyasamy Department of microbiology Periyar UniversitySalem 636011India Department of microbiology Vivekanandha College of Arts and Sciences for WomenTiruchengode 637205India Research and Development Tara Biologics LimitedWokingSurrey GU216BPUnited Kingdom Department of marine Biotechnology Bharathidasan UniversityTiruchirappalli 620024India

The Pleurotus florida is recognized as a medicinal and edible mushroom and the present study intends to reveal the active isomeric molecules from this *** *** was cultivated using different nutrient supplements:groundnut husk,maize powder,horse gram powder and coconut oil-cake *** gram supplement showed the higher mushroom yield and henceit was used for the cultivation of *** extract of *** was found to be efficient in antioxidant activity among ethanol,aqueous,ethyl acetate and hexane *** bioactive fraction 3-methoxy-4-hydroxy cinnamic acid(PF5)was isolated and purified from the methanolic extract of *** by column chromatography,thin layer chromatography(TLC)and gas chromatography-mass spectrum(GC-mS)and further it was characterized by Nuclear magnetic resonance(NmR).The PF5 was tested for its DPPH and reducing power assays,and the IC_(50) values were found to be 21.7μg/mL and 105μg/mL,*** found that the cytotoxic effect of 3-methoxy-4-hydroxy cinnamic acid was tested against the lung cancer cell line using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide(mTT),sulphorodamine B(SRB)and trypan blue assays which exhibited a higher cytotoxic effect(CTC_(50),645μg/mL).These results suggested that 3-methoxy-4-hydroxy cinnamic acid from *** could be explored as a novel and potent natural antioxidant and cancer preventive agent,alternative to existing synthetic molecules.

关键词： Pleurotus florida methanolic extract Isomeric molecule Antioxidant activity Cytotoxic activity

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

Unraveling the nature of sensing in electrostatic mEmS gas sensors

引用

microsystems & Nanoengineering 2024年第3期10卷 109-117页

作者： Yasser S.Shama Sasan rahmanian Hamza mouharrar Rana Abdelrahman Alaaeldin Elhady Eihab m.Abdel-rahman Systems Design Engineering University of Waterloo200 University Ave WWaterloo N2L 3G1 ONCanada mechanical Engineering Benha Faculty of EngineeringBenha UniversityBenha 13511Egypt

This paper investigates the fundamental sensing mechanism of electrostatic mEmS gas *** compares among the responsivities of a set of mEmS isopropanol sensors before and after functionalization,and in the presence and absence of electrostatic fields when operated in static and dynamic detection *** the static mode,we found that the sensors do not exhibit a measurable change in displacement due to added *** the other hand,bare sensors showed a clear change in displacement in response to isopropanol *** the dynamic mode,functionalized sensors showed a measurable frequency shift due to the added mass of isopropanol *** the presence of strong electrostatic fields,the measured frequency shift was found to be threefold larger than that in their absence in response to the same concentration of isopropanol *** enhanced responsivity of dynamic detection allows the sensors to measure the vapor mass captured by the functional material,which is not the case for static *** detection of isopropanol by bare sensors in static mode shows that change in the medium permittivity is the primary sensing *** enhanced responsivity of dynamic mode sensors when operated in strong electrostatic fields shows that their sensing mechanism is a combination of a weaker added mass effect and a stronger permittivity *** findings show that electrostatic mEmS gas sensors are independent of the direction of the gravitational field and are,thus,robust to changes in *** is erroneous to refer to them as‘gravimetric’sensors.

关键词： mechanism electrostatic measurable

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：