检索结果-南通市图书馆

Er^(3+)/Yb^(3+)/Li^+/Zn^(2+):Gd_2(MoO_4)_3 upconverting nanophosphors in optical thermometry

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2019年第3期37卷 242-247页

作者： Anita Kumari lakshmi Mukhopadhyay Vineet Kumar Rai Laser and Spectroscopy Laboratory Department of Applied Physics Indian Institute of Technology (Indian School of Mines)

Er^(3+)-Yb^(3+)-Li^+:Gd_2(MoO_4)_3 and Er^(3+)-Yb^(3+)-Zn^(2+):Gd_2(MoO_4)_3 nanophosphors, synthesized by chemical co-precipitation technique were characterized through XRD,FESEM,dynamic light scattering(DLS),diffuse reflectance, photoluminescence, photometric and decay time analysis. The enhancement of about～28, ～149 and ～351 times in the green upconversion emission band is observed for the optimized Er^(3+)-Yb^(3+),Er^(3+)-Yb^(3+)-Li^+ and Er^(3+)-Yb^(3+)-Zn^(2+):Gd_2(MoO_4)_3 nanophosphors in comparison to the singly Er^(3+) doped nanophosphors. The electric dipole-dipole interaction is found to be responsible for the concentration quenching. The temperature dependent behaviour of the two green thermally coupled levels of the Er^(3+) ions based on the fluorescence intensity ratio technique was studied. The maximum sensor sensitivity ～38.7 × 10^(-3) K^(-1) at 473 K for optimized Er^(3+)-Yb^(3+)-Zn^(2+) codoped Gd_2(MoO_4)_3 nanophosphors is reported with maximum population redistribution ability～88% among the ~2H_(11/2) and ~4S_(3/2) levels.

关键词： Upconversion Phosphors Dynamic light scattering Non-lanthanide ions Optical thermometry Rare earths

Grain boundary effect on structural, optical, and electrical properties of sol-gel synthesized Fe-doped SnO_(2) nanoparticles

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第4期30卷 555-564页

作者： Archana V lakshmi Mohan Kathirvel P Saravanakumar S Department of Sciences Amrita School of EngineeringCoimbatoreAmrita Vishwa VidyapeethamIndia Research and Development Center Bharathiar UniversityCoimbatore-641046TamilnaduIndia GRD Center for Materials Research Department of PhysicsP S G College of TechnologyCoimbatore-641004TamilnaduIndia Department of Physics N S S CollegePandalam-689501KeralaIndia

Tin oxide(SnO_(2)) and iron-doped tin oxide(Sn_(1-x)Fe_(x)O_(2),x=0.05 wt%,0.10 wt%) nanoparticles are synthesized by the simple sol-gel *** structural characterization using x-ray diffraction(XRD) confirms tetragonal rutile phases of the *** variations in lattice parameters and relative intensity with Fe-doping concentration validate the incorporation of iron into the *** compressive strain present in the lattice estimated by using peak profile analysis through using Williamson-Hall plot also exhibits the influence of grain boundary formation in the *** radiative recombination and quenching observed in optical characterization by using photoluminescence spectrum(PL) and the shift in the band gap estimated from UV-visible diffused reflectance spectrum corroborate the grain boundary *** spectrum and the morphological analysis by using a field emission scanning electron microscope(FESEM) also indicate the formation of grain *** compositional analysis by using energy dispersive x-ray spectrum(EDAX) confirms Fe in the SnO_(2) *** conductivity studies exhibit that the impendence increases with doping concentration increasing and the loss factor decreases at high frequencies with doping concentration increasing,which makes the Sn_(1-x)Fe_(x)O_(2) a potential candidate for device applications.

关键词： sol-gel compressive strain grain boundary AC conductivity

Multimodality management of resectable gastric cancer: A review

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2014年第10期6卷 393-402页

作者： Helen Shum lakshmi Rajdev Department of Oncology Montefiore Medical Center Albert Einstein College of MedicineBronx NY 10461 United States

Adenocarcinoma of the stomach carries a poor prognosis and is the second most common cause of cancer death worldwide. It is recommended that surgical resection with a D1 or a modified D2 gastrectomy(with at least 15 lymph nodes removed for examination), be performed in the United States, though D2 lymphadenectomies should be performed at experienced centers. A D2 lymphadenectomy is the recommended procedure in Asia. Although surgical resection is considered the definitive treatment, rates of recurrences are high, necessitating the need for neoadjuvant or adjuvant therapy. This review article aims to outline and summarize some of the pivotal trials that have defined optimal treatment options for non-metastatic non-cardia gastric cancer. Some of the most notable trials include the INT-0116 trial, which established a benefit in concurrent chemoradiation and adjuvant chemotherapy. This was again confirmed in the ARTIST trial, especially in patients with nodal involvement. Later, the Medical Research Council Adjuvant Gastric Infusional Chemotherapy trial provided evidence for the use of perioperative chemotherapy. Targeted agents such as ramucirumab and trastuzumab are also being investigated for use in locally advanced gastric cancers after demonstrating a benefit in the metastatic setting. Given the poor response rate of this difficult disease to various treatment modalities, numerous studies are currently ongoing in an attempt to define a more effective therapy, some of which are briefly introduced in this review as well.

关键词： Neoadjuvant chemotherapy Adjuvant che-motherapy Adjuvant chemoradiation Gastric cancer Gastric adenocarcinoma

Enhanced hydrogen production activity over BiOX–TiO2 under solar irradiation:Improved charge transfer through bismuth oxide clusters

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 Energy Chemistry 2017年第3期26卷 390-397页

作者： Police Anil Kumar Reddy Chennaiahgari Manvitha Pullagurala Venkata Laxma Reddy Ki-Hyun Kim valluri Durga Kumari Department of Civil&Environmental Engineering Hanyang University222WangsimniRoSeoul 133-791Republic of Korea Inorganic and Physical Chemistry Division Indian Institute of Chemical TechnologyHyderabad 500 607India Sarojini Naidu Vanitha Mahavidyala Osmania UniversityHyderabad 500 001India Program in Environmental Science and Engineering University of Texas El PasoEl PasoTexas 799038USA

A series of titania nanoparticles and nanotubes deposited with various quantities of bismuth（Bi） were prepared via sol-gel and hydrothermal methods, respectively. They were then characterized using X-ray diffraction spectroscopy（XRD）, X-ray photo electron spectroscopy（XPS）, UV–Vis diffused reflectance spectra（DRS）, photoluminescence spectra（PLS）, transmission electron microscopy（TEM）, energy dispersive analysis of X-rays（EDAX）, and BET surface analysis. These catalysts were employed for the photocatalytic production of hydrogen from a mixture of pure water and glycerol under solar light irradiation. The presence of the Bispecies was found to play a vital role in enhancing activity while minimizing electron hole recombination（relative to bare TiO）. The nanotubes exhibited better activity than the nanoparticles of Bi-deposited TiO, showing the significance of the morphology; however, photocatalytic activity is predominantly dependent on the deposition of bismuth. The activity increased by approximately an order of magnitude at the optimum concentration of Bi deposited over TiO（2 wt%）. The presence of the Bispecies played a vital role in minimizing electron hole recombination, resulting in higher activity compared to bare TiO.

关键词： Bismuth TiO2 nanotubes Visible photocatalysis Water splitting Hydrogen

Assessment of SNP and InDel Variations Among Rice Lines of Tulaipanji x Ranjit

在线全文

学校读者我要写书评

暂无评论

Rice science 2017年第6期24卷 336-348页

作者： Subhas Chandra ROY vijaya Bhasker REDDY LACHAGARI Plant Genetics & Molecular Breeding Laboratory Department of Botany University of North Bengal Siliguri 734013 India AgriGenome Labs Private Limited Hyderabad 500078 India

Genotyping by sequencing(GBS) is the recent approach of next-generation sequencing technique for discovering and genotyping single nucleotide polymorphisms(SNPs) in crop species. Genotypic variation studies(SNPs and insertion-deletions/In Dels) were performed using four rice lines based on GBS data by aligning to the reference genome Nipponbare. Local aromatic rice landrace Tulaipanji was crossed with Ranjit, and two distinct lines were identified from the progenies: one line with awns and aroma traits and the other without awns and aroma. Total number of SNPs and In Dels identified were 52 810 and 4 327 at read depth 10, respectively. Out of the total polymorphic SNPs/In Dels, 16 490 were intergeneric, 7 812 were inside gene, and 4 435 were intronic. Phylogenetically, Tulaipanji was closer to the reference genome nipponbare. Based on recurrent parent genome analysis, out of 10 013 alleles, 92.52% was introgressed into progeny-awn from Tulaipanji and 7.48% from Ranjit, whereas progeny-awnless carried 89.19% alleles from Ranjit and only 10.81% alleles from Tulaipanji. In addition, progeny-awn was the highest heterozygous(83.88%) and progeny-awnless was the least(2.24%) at this fifth generation of recombinant inbred lines. These SNP variations may be linked to the phenotypic traits and can be utilized in crop improvement through linkage mapping. These results suggest that adding a high density of SNP markers to a mapping or breeding population through GBS has a great value for numerous applications in rice breeding and genetics research.

关键词： rice genotyping by sequencing insertion-deletion genomic introgression single nucleotide polymorphism awn aroma heterozygous

Mechanical and electronic approaches to improve the sensitivity of microcantilever sensors

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2009年第1期25卷 1-12页

作者： Madhu Santosh Ku Mutyala Deepika Bandhanadham vijaya Rohini Pendyala Institute for Micromanufacturing Louisiana Tech University

Advances in the field of micro electro mechanical systems and their uses now offer unique opportunities in the design of ultrasensitive analytical tools. The analytical community continues to search for cost-effective, reliable, and even portable analytical techniques that can give reliable and fast response results for a variety of chemicals and biomolecules. Microcantilevers （MCLs） have emerged as a unique platform for label-free chem-sensor or bioassay. Several electronic designs, including piezoresistive, piezoelectric, and capacitive approaches, have been applied to measure the bending or frequency change of the MCLs upon exposure to chemicals. This review summarizes mechanical, fabrication, and electronics approaches to increase the sensitivity of MCL sensors.

关键词： Microcantilever Sensor MEMS Sensitivity

Survival after prolonged cardiopulmonary resuscitation in cardiac arrest due to electric shock

在线全文

学校读者我要写书评

暂无评论

Journal of Acute Disease 2018年第3期7卷 137-138页

作者： Dhiraj R Jadhav lakshmi vijaya Joseph Alexis Vinay Pandit Department Of Emergency Medicine JIPMERPuducherryIndia

Cardiac arrhythmias and respiratory paralysis are among the common causes of death in electric shock victims. Emergency physicians face unique challenges in stabilizing airway and spine apart from fibrillating myocard... 详细信息

关键词： Electric injury Pediatric arrest Prolonged CPR

Er^(3+)-Yb^(3+)-Na^(+):ZnWO_(4) phosphors for enhanced visible upconversion and temperature sensing applications

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 Rare Earths 2021年第3期39卷 291-296,I0002页

作者： Sonali Biswas lakshmi Mukhopadhyay Manisha Mondal Vineet Kumar Rai Laser and Spectroscopy Laboratory Department of PhysicsIndian Institute of Technology(Indian School of Mines)Dhanbad-826004JharkhandIndia

The crystal structure and surface morphology of the Er^(3+)/Yb^(3+)/Na+:ZnWO_(4) phosphors synthesized by solid state reaction method were analyzed by X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM) *** frequency upconversion(UC) emission study in the developed phosphors was investigated by using 980 nm laser diode *** effect of codoping in the Er^(3+):ZnWO_(4) phosphors on the UC emission intensity was *** UC emission bands that are exhibited in the blue(490 nm),green(530,552 nm),red(668 nm) and NIR(800 nm) region correspond to the ^(4)F_(7/2)→^(4)I_(15/2).^(2)H_(11/2),^(4)S_(3/2)→^(4)I_(15/2),^(4)F_(9/2)→^(4)I_(15/2) and ^(4)I9/2→^(4)I_(15/2) transitions,*** temperature sensing performance of the Er^(3+)-Yb^(3+)-Na+:ZnWO_(4) phosphors was investigated based on the 2 H_(11/2)→^(4)I_(15/2) and ^(4)S_(3/2)→^(4)I_(15/2) thermally coupled transitions of the Er^(3+)*** photometric study was also carried out for the developed phosphors.

关键词： Upconversion Non-lanthanides Temperature sensing Fluorescence intensity ratio Rare earths

Green synthesis,characterization and antimicrobial activity of silver nanoparticles using methanolic root extracts of Diospyros sylvatica

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第5期29卷 157-163页

作者： lakshmi Pethakamsetty Kalyani Kothapenta Hanumanta Rao Nammi lakshmi Kalyani Ruddaraju Pratap Kollu Soon Gil Yoon Sri Venkata Narayana Pammi Department of Microbiology College of Science and Technology Andhra University Visakhapatnam 530003 India DST-PURSE Programme Advanced Analytical Laboratory Andhra University Visakhapatnam 530003 India Sri Vishnu College of Pharmacy Department of Pharmaceutical Technology Vishnupur Bhimavaram A.P. 530041 India DST-INSPIRE Faculty Department of Metallurgical Engineering & Materials Science Indian Institute of Technology Bombay Mumbai 400076 India Department of Materials Science and Engineering Chungnam National University Daeduk Science Town 305-764 Daejeon South Korea

The current research study focuses to formulate the biosynthesized silver nanoparticles for the first time from silver acetate using methanolic root extracts of Diospyros sylvatica,a member of family Ebenaceae. TEM analysis revealed the average diameter of Ag NPs around 8 nm which is in good agreement with the average crystallite size（10 nm）calculated from X-ray Diffraction（XRD）analysis. Further the study has been extended to the antimicrobial activity against test pathogenic Gram（＋）ve,Gram（-）ve bacterial and fungal strains. The bioinspired Ag-NP showed promising activity against all the tested bacterial strains and the activity was enhanced with increased dosage levels

关键词： Root extract Silver nanoparticles Antimicrobial properties