检索结果-南通市图书馆

Highly Efficient Synthesis of Bis（indolyl）methanes Catalyzed by Sodium Tetrafluoroborate

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2007年第1期25卷 13-15页

作者： KAMBLE, Vinod Tribhuvannathji BANDGAR, Babasaheb Pandurang BAVIKAR, Sudhir Narayanrao Organic Chemistry Research Laboratory School of Chemical SciencesSwami Ramanand Teerth Marathwada University Nanded-431 606 India

Sodium tetrafluoroborate （NaBF4） was found to catalyze the electrophilic substitution reactions of indoles with aldehydes and ketones under solvent-free conditions to afford the corresponding bis（indolyl）methanes ... 详细信息

关键词： sodium tetrafluoroborate indole aldehyde ketone bis(indolyl)methane

L-Proline Catalyzed Solvent-Free Knoevenagel Condensation for the Synthesis of 3-Substituted Coumarins

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2007年第11期25卷 1686-1689页

作者： KARADE, Nandkishor. N. GAMPAWAR, Sumit V. SHINDE, Sandeep. V. JADHAV, Wamanrao. N. School of Chemical Sciences Swami Ramanand Teerth Marathwada University Nanded-431606 Maharashtra India Dnyanopasak College Parbhani-431401 Maharashtra India

L-Proline was utilized as an efficient organo-catalyst for the environmentally benign synthesis of 3-substituted coumarins by the Knoevenagel condensation of substituted 2-hydroxybenzaldehydes with reactive methylene ... 详细信息

关键词： Knoevenagel condensation coumarin salicylaldehyde L-proline fl-ketoester solvent-free synthesis

Imino Diels-Alder reactions:One-pot synthesis of tetrahydroquinolines

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2010年第3期21卷 265-268页

作者： Vinod T.Kamble Bhaskar S.Davane Sanjay A.Chavan Dnyanoba B.Muley Sandeep T.Atkore Organic Chemistry Research Laboratory School of Chemical SciencesSwami Ramanand Teerth Marathwada University Research and Post Graduate Centre Yeshwant College Gopikabai Sitaram Gawande Science College

An efficient synthesis of tetrahydroquinoline derivatives is reported via three component coupling reactions of aldehydes and anilines with various dienophiles in the presence of a catalytic amount of perchloric acid ... 详细信息

关键词： Tetrahydroquinolines HClO_4-SiO_2 Dienophiles Aldehydes Amines

维普期刊数据库

A multiwavelength view of the ISM in the merger remnant galaxy Fornax A

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2013年第8期13卷 885-898页

作者： Swati Pralhadrao Deshmukh Bhagorao Tukaram Tate Nilkanth Dattatray Vagshette Sheo Kumar Pandey Madhav Khushalrao Patil Department of Physics Institute of Science Department of Physics Balbhim Arts Science and Commerce College School of Physical Sciences Swami Ramanand Teerth Marathwada University School of Studies in Physics & Astrophysics Pandit Ravishankar Shukla University

We present multi-wavelength imagery of the merger remnant galaxy NGC 1316 with an objective to study the dust content and its association with the other phases of the interstellar medium. Color-index maps as well as extinction maps derived for this galaxy reveal an intricate and complex dust morphology in NGC 1316, i.e. there is a prominent lane in the inner part, while at about 6-7 kpc it apparently takes the form of an arc-like pattern extending along the northeast direction. In addition to this, several other dust clumps and knots are also evident in this galaxy. The dust emission mapped using Spitzer data at 8 μm indicates even more complex morphological structures of the dust in NGC 1316. The extinction curve derived over the optical to near-IR bands closely follows the standard Galactic curve, suggesting similar properties of the dust grains. The dust content of NGC 1316, estimated from optical extinction, is ,- 2.13 × 10^5 M⊙. This is a lower limit compared to that estimated using the IRAS flux densities of ,-5.17× 10^6 M⊙ and the flux densities at 24, 70 and 160 p.m from MIPS ,-3.2× 10^7 M⊙. High resolution Chandra observations of this merger remnant system have provided an unprecedented view of the complex nature exhibited by the distribution of hot gas in NGC 1316, which closely matches the morphology of ionized gas and to some extent also the dust. X-ray color-color plots for the resolved sources within the optical D25 extent of NGC 1316 have enabled us to separate them into different classes.

关键词： galaxies individual (NGC 1316) - galaxies: ISM - X-rays: ISM - (ISM:) dust - extinction - galaxies: elliptical and lenticular, cD

维普期刊数据库

Bimetallic zeolitic imidazolate framework-derived substrate-free anode with superior cyclability for high-capacity lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第8期67卷 116-126页

作者： Bhavana Joshi Edmund Samuel Yong-il Kim Govindasami Periyasami Mostafizur Rahaman Sam S.Yoon School of Mechanical Engineering Korea UniversitySeoul136-713Republic of Korea Department of Physics NES Science CollegeSwami Ramanand Teerth Marathwada UniversityLatur RoadNandedMaharashtra431606India Department of Chemistry College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

Freestanding carbon nanofibers loaded with bimetallic hollow nanocage structures were *** nanocages inherited the rhombic dodecahedral morphology of the zeolitic imidazolate framework(ZIF)precursors,ZIF-8 and *** anode materials for lithium-ion batteries(LIBs),the bimetallic nanocage-loaded freestanding carbon nanofibers effectively buffered volume expansions and alleviated pulverization through their different reduction and oxidation *** higher capacities of the composite anodes arose via the formation of the Li_(x)Zn alloy and Li_(2)O by Zn and Co ions,respectively,and the enhanced conductivity conferred by the carbon nanofibers.A synergistic effect of the composite components toward the strong electrochemical performance(688 m A h·g^(-1)at 1200 m A·g^(-1))of the bimetallic nanocage-loaded fibers was demonstrated through the superior long-term stability of the anode(1048 m A h·g^(-1)after 300 cycles at 100 m A·g^(-1)),suggesting that the fabricated anode can be a promising material for use in portable LIBs.

关键词： Carbon nanofiber Nanostructure Composite anode Zeolitic imidazolate framework

维普期刊数据库

Dielectric spectroscopy and hydrogen bonding studies of 1-chloropropane-ethanol mixture using TDR technique

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2019年第2期9卷 50-55页

作者： Ravindra V.Shinde Avadhut R.Deshmukh Shital A.Ingole Ashok C.Kumbharkhane College of Agriculture Engineering and Technology Vasantrao Naik marathwada Krishi Vidyapeeth Basmat Road Parbhani 431402 MaharashtraIndia School of Physical Sciences swami ramanand teerth marathwada university Vishnupuri Nanded 431606MaharashtraIndia

The time-domain reflectometry technique was exercised to assess the complex permittivities of 1-chloropropane and ethanol along with their binary mixture in the frequency range of 10MHz–50 GHz and in the temperature range of 10–25℃.Dielectric parameters like static dielectric permittivity(ε_(0))and relaxation time(τ)have been acquired by the least-square-fit *** obtained assessments of static permittivity and relaxation time were used to compute various dielectric parameters like excess dielectric constant,excess relaxation time,Kirkwood correlation factor and thermodynamic *** experimental outcome illustrates the nonlinear variations in dielectric permittivity,relaxation time and authenticates the structural formation due to intermolecular interaction between 1-chloropropane and *** rotary motion and dipole reorientation movements of these complex systems are presented in agreement with the molar entropy and enthalpy.

关键词： Time-domain reflectometry complex permittivity dielectric relaxation thermodynamic parameter Kirkwood factor.

Electrical Properties of Newly Calcified Tissues on the Surface of Silver Ion Administrated Hydroxyapatite Scaffolds

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 Biomaterials and Nanobiotechnology 2020年第2期11卷 83-100页

作者： Manjushree M. Bahir Rajendra S. Khairnar Megha P. Mahabole National Center for Cell Science Pune India swami ramanand teerth marathwada university Nanded India

The application of electric field to graft materials has significant contribution in bone healing mechanism. Hence, the aim of this study is to develop conductive hydroxyapatite (HAp) scaffolds by introducing different concentrations of silver ion into its structure and demonstrate its impact on in vitro bioactivity and electrical properties. Hydroxyapatite was synthesized by wet chemical method and calcium ions from HAp structure have been partially replaced by silver ions. The HAp and Ag-HAp nanocomposites were characterized by Fourier-transform infrared, Raman spectroscopy, XRD and EDAX for functional group and phase formation analysis as well as to confirm existence of silver ions in HAp structure respectively. Bioactivity of these scaffolds was assessed by using simulated body fluid. The surface morphology, structural analysis and electrical properties of scaffolds before and after formation of newly calcified tissues on its surface were examined via scanning electron microscopy (SEM), XRD, FTIR, dielectric and impedance spectroscopy techniques. Overall, our finding suggests that the administration of silver ions in HAp scaffold boosts bioactivity and has strong correlation with electrical properties.

关键词： Hydroxyapatite Wet Chemical Method Bioactivity Electrical Properties

Dielectric relaxation study of aqueous ethylene glycol mono-methyl ether(EGME)with water using time domain reflectometry technique in the frequency range 10MHz to 50 GHz

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 Advanced Dielectrics 2020年第3期10卷 51-59页

作者： Zamir S.Khan M.P.Lokhande Avadhut Deshmukh A.C.Kumbharkhane Department of Physics Anjuman College of Engineering and Technology Sadar NagpurIndia Department of Physics&Electronics GVISH Amravati 444604India School of Physical Sciences swami ramanand teerth marathwada university Nanded India

The Complex permittivity spectra of glycol ether(GE)compounds such as ethylene glycol mono-methyl ether(EGME)with water mixture over entire concentration range and in temperature range of 10-25℃ have been determined using Time Domain Reflectometry(TDR)technique in the frequency range 10MHz to 50 *** complex permittivity spectra for EGME-water were fitted in the Cole-Davidson *** Static dielectric constant(ε_(0)^(E)),Relaxation time(τ),effective Kirkwood correlation factor(g_(eff)),excess permittivity(ε_(0)),thermodynamic parameters(activation enthalpy and activation entropy)and Bruggeman factor(f_(B))have been calculated by the nonlinear least square fit *** intermolecular interactions between EGME-water binary mixtures suggest the nonlinear behavior of dielectric *** contribution of hydrogen bonding interactions among the solute-solvent mixtures is confirmed by Excess properties and Bruggeman factor.

关键词： Ethylene glycol mono-methyl ether complex permittivity Kirkwood correlation factor excess dielectric properties thermodynamic parameters Bruggeman factor

Effect of incubation in simulated body fluid on dielectric and photoluminescence properties of nano-hydroxyapatite ceramic doped with strontium ions

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 Biomedical Science and Engineering 2012年第7期5卷 396-405页

作者： Megha P. Mahabole Manjushree M. Bahir Namdev V. Kalyankar Rajendra S. Khairnar School of Physical Sciences Swami Ramanand Teerth Marathwada University Nanded India Yeshwant Mahavidyalaya Nanded India

This paper reports the dielectric and photoluminescence measurements of ossiointegrated strontium doped hydroxyapatite bioceramic. The study on invitro bioactivity of Sr-HAp is carried out by using modified simulated body fluid. Dielectric properties of these ossiointegrated samples are studied in the frequency range 10 Hz to 1 MHz at room temperature. Dielectric constant is found to be decreasing with increase in incubation period and frequency of applied ac field. Higher the period of incubation and applied ac frequency, higher is the dielectric loss. AC conductivity shows frequency independent behaviour for all samples in lower frequency region and then increases linearly with increase in frequency. Sample incubated for longer duration shows higher conductivity. The optical properties of incubated Sr-HAp samples are also investigated with photoluminescence (PL) technique. The PL study shows the blue emission at around 476 nm when excited at 409 nm. The PL in tensity increases with increase in incubation duration and Sr-substitution.

关键词： Hydroxyapatite Dielectric Properties Luminescence Impedance Biomedical Applications