Microwave assisted processing of silver thick films for microelectronic applications

Rane, Sunit,Bhatkar, Rushna,Mulik, Uttam,Amalnerkar, Dinesh Techno-Press 2013 Advances in materials research Vol.2 No.3

This paper aims to focus on the microwave processing of thick films which is a fast, cheap technique and could be the alternative to the currently used conventional high temperature processing technique. Microwave processing has gained worldwide acceptance as a novel method for heating and sintering a variety of materials, as it offers specific advantages in terms of speed, energy efficiency, process simplicity, finer microstructures and lower environmental hazards. Silver conducting thick films were prepared and processed in the household microwave oven. The films sintered at different time period by keeping the other parameter such as microwave power, film thickness etc constant. The microstructure analysis revealed that the surface morphology of the microwave processed films become compact with respect to the processing time. The sheet resistance for microwave sintered silver films is in the range of 0.003 to $1.207{\Omega}/{\Box}$ where as the films fired at 750 and $850^{\circ}C$ showed the resistance of 0.009 and $0.003{\Omega}/{\Box}$ which can be comparable. The results revealed that the microstructure of the microwave sintered films has more uniform and compact surface than that of the conventionally fired films. The paper reports upon the preparation of silver thick film by screen printing technique and processing the same by microwave which also compared with the conventionally processed thick films.

OZONE ENHANCES QUALITY AND SHELF LIFE OF DRIED Trichogaster pectoralis

Ranee Surakarnkul,Pakorn Unprasert,Juan L. Silva 한국수산과학회 양식분과 2015 한국수산과학회 양식분과 학술대회 Vol.2015 No.5

Prevalence of Tobacco and Alcohol Consumption among Fishermen in Udupi Taluk, Karnataka, India: a Cross-Sectional Study

Rane, Prasad Pramod,Narayanan, Prakash,Binu, VS,Unnikrishnan, Bhaskaran Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4

Background: Stress associated with fishing is known to trigger consumption of alcohol and tobacco among fishermen. This study aimed to assess the prevalence of tobacco and alcohol consumption among fishermen in Udupi Taluk in the state of Karnataka, India, and to study associations with health status and job stress. Materials and Methods: The study was conducted among 825 fishermen in Udupi Taluk of Karnataka between January-June 2015, using a two stage cluster sampling procedure. Associations between variables of interest were assessed using multivariable analysis and logistic regression models. Results: The prevalences of consumption of tobacco, alcohol and either of these substances were 64.2%, 45.6% and 86.9% respectively. There was a positive association between alcohol and any form of tobacco consumption with income but none with respondent's job stress and health status. Conclusions: Our study concluded that fishermen with poor health status are seen more among tobacco and alcohol users.

CFD analysis of flashing flow in two-phase geothermal turbine design

Sham Rane,Li He 한국CDE학회 2020 Journal of computational design and engineering Vol.7 No.2

A thermal power plant for the East African Rift countries is under study for combined energy and freshwater generation using geothermal water, available at above 500 kPa pressure and temperature exceeding 150◦C. This article presents the computational fluid dynamics (CFD) model and analysis of the two-phase turbine used for power generation in this total flow thermal plant. Flash boiling was implemented using a two-fluid multiphase model with the thermal phase-change criteria for heat, mass, and momentum transfer in the CFD solver ANSYS CFX. Initially, flashing flow in a converging–diverging nozzle was validated. This stationary nozzle model was then extended to a curved rotating nozzle reaction turbine and the results of flow and power were evaluated against available test data at 400 kPa feed water pressure under subcooled condition of 117◦C and a very low backpressure of 6 kPa. Flow through this turbine was predicted within 8% deviation. An overestimate in thermodynamic power by 30–50% was predicted at speeds below 4000 rpm, while at the design speed of 4623 rpm the deviation was less than 5%. Rotor torque and hence power estimate was found to be dependent on the bubble size, bubble number density, and heat transfer parameters prescribed in the CFD model. The vapour dryness fraction at turbine exit was close to an isentropic expansion vapour quality. The isentropic efficiency was 7.5–17% for the analysed speed range.

Versius Surgical Robot Thyroid Surgery

Pawan Rane 대한외과학회 2021 대한외과학회 학술대회 초록집 Vol.2021 No.11

High-Throughput, Quantitative Enzyme Kinetic Analysis in Microdroplets Using Stroboscopic Epifluorescence Imaging

Hess, David,Rane, Anandkumar,deMello, Andrew J.,Stavrakis, Stavros American Chemical Society 2015 ANALYTICAL CHEMISTRY - Vol.87 No.9

<P>Droplet-based microfluidic systems offer a range of advantageous features for the investigation of enzyme kinetics, including high time resolution and the ability to probe extremely large numbers of discrete reactions while consuming low sample volumes. Kinetic measurements within droplet-based microfluidic systems are conventionally performed using single point detection schemes. Unfortunately, such an approach prohibits the measurement of an individual droplet over an extended period of time. Accordingly, we present a novel approach for the extensive characterization of enzyme–inhibitor reaction kinetics within a single experiment by tracking individual and rapidly moving droplets as they pass through an extended microfluidic channel. A series of heterogeneous and pL-volume droplets, containing varying concentrations of the fluorogenic substrate resorufin β-<SMALL>d</SMALL>-galactopyranoside and a constant amount of the enzyme β-galactosidase, is produced at frequencies in excess of 150 Hz. By stroboscopic manipulation of the excitation laser light and adoption of a dual view detection system, “blur-free” images containing up to 150 clearly distinguishable droplets per frame are extracted, which allow extraction of kinetic data from all formed droplets. The efficiency of this approach is demonstrated via a Michaelis–Menten analysis which yields a Michaelis constant, <I>K</I><SUB>m</SUB>, of 353 μM. Additionally, the dissociation constant for the competitive inhibitor isopropyl β-<SMALL>d</SMALL>-1-thiogalactopyranoside is extracted using the same method.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2015/ancham.2015.87.issue-9/acs.analchem.5b00766/production/images/medium/ac-2015-00766c_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac5b00766'>ACS Electronic Supporting Info</A></P>

Study of microstructure, impedance and dc electrical properties of RuO2-spinel based screen printed ‘green’ NTC thermistor

Shweta Jagtap,Sunit Rane,Rohini Aiyer,Suresh Gosavi,Dinesh Amalnerkar 한국물리학회 2010 Current Applied Physics Vol.10 No.4

The NTC powder materials were prepared chemically using acetates of (Mn–Co–Ni), as precursor materials. The sintering of the powders shows the existence of spinel phases at comparatively low temperature,i.e. 800 ℃. ‘Green’ thick films were prepared by admixing of the spinel powder, RuO2, lead free glass frit and the organic vehicle. Synthesized powders as well as the thermistor films were characterised by FTIR spectroscopy, TG/DTA, XRD and SEM. The electrical parameters like sheet resistance, thermistor constant,temperature co-efficient of resistance of the thick film thermistors are presented. The impedance of the thermistor films was measured and it has been correlated with the theoretical model and its equivalent circuit using the ‘Cole–Cole’ plots.

Effect of Micronization on the Extent of Drug Absorption from Suspensions in Humans

Oh, Doo-Man,Curl, Rane L.,Yong, Chul-Soon,Amidon, Gordon L. 영남대학교 약품개발연구소 1996 영남대학교 약품개발연구소 연구업적집 Vol.6 No.-

A microscopic mass balance approach has shown that the initial saturation (is), absorption number (An), dose number (Do), and dissolution number (Dn) are four fundamental dimensionless parameters that can be used to estimate the fraction dose absorbed (F) of suspensions of poorly soluble drugs in humans. The dissolution number of a drug increases with decreasing its particle size. The effect of micronization on F for suspensions was investigated in terms of Dn. About 90% of maximal F can be achieved at Dn?2. Increasing the solubility of a drug results in better oral absorption through increasing Dn and decreasing Do. The fractions dose absorbed of digoxin, griseofulvin, and benoxaprofen agree with predicted F values using estimated parameters. Drugs with low Do and low Dn can be more completely in addition to micronization. Solubility at the physiological pH should be used for the estimation of the fraction dose absorbed.

Instantaneous Synthesis of Faceted Iron Oxide Nanostructures Using Microwave Solvothermal Assisted Combustion Technique

Shinde, Manish,Qureshi, Nilam,Rane, Sunit,Kim, Jang Ah,Kim, Taesung,Amalnerkar, Dinesh American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.7

<P>Microwaves are routinely used in the contemporary chemical synthesis of nanomaterials to increase the reaction kinetics and reduce the reaction time. In the present investigation, microwaves have been used in two step solvothermal and combustion method for the synthesis of iron oxide (alpha-Fe2O3) nanostructures. The structural examination reveals formation of hematite phase of iron oxide. Morphological analysis shows formation of sheet and rod-like morphologies depending on reaction conditions. Owing to such morphologies enabling relatively large surface to volume ratio, these nanostructures can find useful applications in supercapacitors, photocatalysis and sensors.</P>

Efficient decolorization and detoxification of textile industry effluent by <i>Salvinia molesta</i> in lagoon treatment

Chandanshive, Vishal V.,Rane, Niraj R.,Gholave, Avinash R.,Patil, Swapnil M.,Jeon, Byong-Hun,Govindwar, Sanjay P. Elsevier 2016 Environmental research Vol.150 No.-

<P><B>Abstract</B></P> <P> <I>Salvinia molesta</I>, an aquatic fern was observed to have a potential of degrading azo dye Rubine GFL up to 97% at a concentration of 100mg/L within 72h using 60±2g of root biomass. Both root as well as stem tissues showed induction in activities of the enzymes such as lignin peroxidase, veratryl alcohol oxidase, laccase, tyrosinase, catalase, DCIP reductase and superoxide dismutase during decolorization of Rubine GFL. FTIR, GC-MS, HPLC and UV–visible spectrophotometric analysis confirmed phytotransformation of the model dye into smaller molecules. Analysis of metabolites revealed breakdown of an azo bond of Rubine GFL by the action of lignin peroxidase and laccase and formation of 2-methyl-4-nitroaniline and N-methylbenzene-1, 4-diamine. Anatomical tracing of dye in the stem of <I>S. molesta</I> confirmed the presence of dye in tissues and subsequent removal after 48h of treatment. The concentration of chlorophyll pigments like chlorophyll a, chlorophyll b and carotenoid was observed during the treatment. Toxicity analysis on seeds of <I>Triticum aestivum</I> and <I>Phaseolus mungo</I> revealed the decreased toxicity of dye metabolites. <I>In situ</I> treatment of a real textile effluent was further monitored in a constructed lagoon of the dimensions of 7m×5m×2m (total surface area 35m<SUP>2</SUP>) using <I>S. molesta</I> for 192h. This large scale treatment was found to significantly reduce the values of COD, BOD<SUB>5</SUB> and ADMI by 76%, 82% and 81% considering initial values 1185, 1440mg/L and 950 units, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Macrophyte <I>S. molesta</I> showed a potential for textile dyes and effluent treatment </LI> <LI> A possible dye degradation pathway of Rubine GFL by <I>S. molesta</I> is proposed </LI> <LI> <I>S. molesta</I> in constructed lagoon treated 52,500L of textile effluent </LI> <LI> Phytotoxicity assay revealed less toxic nature of by-products after treatment </LI> <LI> Anatomical study of stem revealed entry and removal of Rubine GFL </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>