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Determining the relationship between chemical composition and size, shape and effective density of airborne fine particles through concurrent use of inertial and optical based measurements

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Particuology 2016年第5期14卷 93-101页

作者： Anand kumar Tarun gupta Environmental Engineering and Management Program Indian Institute of Technology Kanpur Kanpur 208016 India Institute of Atmospheric and Climate Science Swiss Federal Institute of Technology Zurich Zurich 8092 Switzerland Department of Civil Engineering Indian Institute of Technology Kanpur Kanpur 208016 India

This study presents the development of a medium flow, multiple slit based PM2.5 （particle aerodynamic diameter 〈2.5 μm） inertial impactor. Its performance was compared with that of a light scattering based optical particle sizer in a field study and in controlled lab based experiments using polydisperse dolomite powder as test aerosol. The impactor＇s optimum nozzle configuration had a cutoff size of 2.51 μm （aero- dynamic diameter） at an operating flow rate of 215 L/rain with a pressure drop of 0.35 kPa across the impactor stage. Because the apparent particle density of an ambient aerosol depends on the physical properties and the chemical composition of the particles, the PM2.5 mass concentration was measured with an optical particle sizer and an inertial impactor over a weekday and a weekend day in a field study during which the effective particle shape factor and density were in tandem modified in order to com- pare the results from the two sampling techniques. The correlation of the two instrument results tended towards 1：1 with increasing values of shape factor （irregular shaped） and effective particle density. This observation was supported through chemical investigations of the collected mass, which showed a higher percentage contribution from elements which are mostly of crustal nature （namely, Ca, Fe, and Mg）.

关键词： lmpactor PM2.5 Optical particle counter Effective particle density Shape factor

Uniqueness,reciprocity theorem,and plane waves in thermoelastic diffusion with a fractional order derivative

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Chinese Physics B 2013年第7期22卷 286-297页

作者： Rajneesh kumar Vandana gupta Department of Mathematics Kurukshetra University

In this work, a theory of thermoelasticity with diffusion is taken into consideration by using the methodology of fractional calculus. The governing equations for particle motion in a homogeneous anisotropic fractional order generalized thermoelastic diffusive medium are presented. Uniqueness and reciprocity theorems are proved. The plane wave propagation in the homogeneous transversely isotropic thermoelastic diffusive medium with fractional order derivative is studied. For the two-dimensional problem, there exist a quasi-longitudinal wave, a quasi-transverse wave, a quasi-mass diffusion wave, and a quasi-thermal wave. From the obtained results, the different characteristics of waves, like phase velocity, attenuation coefficient, specific loss, and penetration depth, are computed numerically and presented graphically. Some special cases are also discussed.

关键词： thermoelastic diffusion fractional calculus uniqueness theorem reciprocity theorem

Small bowel adenocarcinoma:An overview

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World Journal of Gastrointestinal Oncology 2022年第2期14卷 413-422页

作者： Divya Khosla Treshita Dey Renu Madan Rahul gupta Shikha Goyal Narendra kumar rakesh Kapoor Department of Radiotherapy and Oncology Postgraduate Institute of Medical Education and ResearchChandigarh 160012India Department of Gastroenterology Shalby Multispeciality HospitalMohali 160062PunjabIndia

Small bowel adenocarcinoma(SBA)is a rare malignancy of the gastrointestinal ***,these tumors are among those with worst *** clinical signs and symptoms and radiological diagnostic challenges often delay treatment,which negatively impacts the prognosis of the ***,recent advances in imaging technology,like multidetector computed tomography,magnetic resonance imaging,and capsule endoscopy,have made earlier and accurate diagnosis *** is the treatment of choice followed by adjuvant ***,there are no strict treatment guidelines available for the management of *** of the available evidence from colorectal and gastric carcinoma has been extrapolated to adequately manage *** for SBA is better than gastric carcinoma but worse than colorectal ***,there is not enough information on the molecular characteristics and tumor *** the incidence of SBA is very low,there is a need for further studies to evaluate the possible application of newer investigative agents and strategies to obtain a better outcome within the framework of international collaborations.

关键词： Adenocarcinoma Chemotherapy Prognostic factors Small bowel Surgery

Appropriate method of core selection and crosstalk optimization in single-mode homogeneous multicore fiber

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Optoelectronics Letters 2020年第2期16卷 126-130页

作者： DABLU kumar rakesh Ranjan Optical Fiber Communication and Photonics Lab Department of Electronics and Communication EngineeringNational Institute of Technology(NIT)PatnaPatna 800005India

The approach for homogeneous core structure design and selection based on low crosstalk, low dispersion, and acceptable mode effective area have been explored. The forward and backward crosstalk behaviors with respect to wavelength, fiber bending radius, and twisting rate in 12-core, and 21-core single-mode trench-assisted homogenous multicore fiber have been analyzed. The new expression for forward crosstalk under bending and twisting conditions has been derived using the conventional method. For the analysis and optimization of crosstalk, three different core structures are considered, it helps to draw the attention to select the appropriate core structure model for multicore fiber, which follows the standards used in telecom services.

关键词： crosstalk fiber trench

Soy Protein Isolate Film by Incorporating Mandelic Acid as Well as Through Fermentation Mediated by Bacillus Subtilis

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Journal of Renewable Materials 2019年第2期7卷 103-115页

作者： rakesh kumar Priya Rani K.Dinesh kumar Department of Biotechnology Central University of South BiharGaya-824236India Department of Materials Science&Engineering Indian Institute of TechnologyPatna 801106India

Soy protein isolate(SPI)biopolymeric films were prepared by adding different contents of mandelic acid(1 to 5%wrt SPI)to glycerol plasticized SPI by solution casting ***,SPI was fermented by Bacillus subtilis to get fermented SPI films by solution *** mass determination of mandelic acid incorporated and fermented SPI films was carried out by sodium dodecyl sulphate-polyacrylamide gel electrophoresis(SDS-PAGE).Mandelic acid incorporated and fermented SPI films were characterized by Fourier-transform infrared spectroscopy(FT-IR),dynamic mechanical analysis(DMA),tensile strength,water uptake and optical transmittance *** indicated that incorporation of mandelic acid in SPI resulted in high tensile strength(8.03 MPa)and highα-relaxation(Tα)as well as low water *** the other hand,films cannot be prepared from fermented SPI with SPI contents of 8%and 12%.However,film from fermented SPI with 16%SPI content could be prepared but it exhibited low tensile strength(3.18 MPa)and low Tαas well as high water *** resulting mandelic acid incorporated SPI films were also subjected to antimicrobial *** all the concentration of mandelic acid,we can easily observe the antimicrobial effect in mandelic acid incorporated SPI films unlike fermented SPI *** work will be helpful in fabricating antimicrobial SPI film from renewable resources.

关键词： Soy protein isolate mandelic acid fermentation film tensile properties antimicrobial properties

Common effluent treatment plant(CETP):Reliability analysis and performance evaluation

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Water Science and Engineering 2018年第3期11卷 205-213页

作者： Ashwini V.Padalkar rakesh kumar CSIR-National Environmental Engineering Research Institute(NEERI) Mumbai 400018India

Common effluent treatment plants(CETPs) have been installed and are in operation at numerous industrial clusters throughout India. They serve to reduce effluent treatment cost, provide better collective treatment, and reduce land cost for small-scale industrial facilities that cannot afford individual treatment plants. Optimum working conditions for treatment of effluent to be at par with discharge standards is a major mandate for any CETP. In this study, the reliability and removal efficiencies(REs) of a CETP in the industrial area of Maharashtra State in India were examined. An established methodology was adopted to determine the effectiveness of the CETP in terms of biochemical oxygen demand(BOD), chemical oxygen demand(COD), total suspended solids(TSS), and oil and grease(O&G) concentrations. The CETP's compliance with respect to design standards and its operation were studied in detail. This paper highlights the results of RE and the coefficient of determination(R2) values obtained from the CETP data, estimates the pollutants removed at the highest and lowest rates over a period of time, and highlights the reasons for problem areas along with remedial measures. It was observed that, except O&G, all the parameters(BOD, COD, and TSS)showed fluctuations in removal efficiencies and their reliabilities. This situation can be improved by releasing effluent containing hydraulic and organic loading to the CETP as per standards and optimizing treatment processes, especially primary clari-flocculators and aeration tanks, both of which are important units of any CETP.

关键词： Aeration tank Clari-flocculator Coefficient of reliability Coefficient of variation Common effluent treatment plant Removal efficiency Reliability analysis

A robust deep structured prediction model for petroleum reservoir characterization using pressure transient test data

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Petroleum Research 2022年第2期7卷 204-219页

作者： rakesh kumar Pandey Anil kumar Ajay Mandal Department of Petroleum and Energy Studies School of Engineering and TechnologyDIT UniversityDehradun248009India Data Science Research Group School of ComputingDIT UniversityDehradun248009India Department of Petroleum Engineering Indian Institute of Technology(Indian School of Mines)Dhanbad826004India

A robust deep learning model consisting of long short-term memory and fully connected neural net-works has been proposed to automatically interpret homogeneous petroleum reservoirs having infinite,no flow,and constant pressure outer boundary *** pressure change data recorded during the well test operation along with its derivative is input into the model to perform the classification for identifying the reservoir model and,further,regression to estimate output *** noise was added to analytical models while generating the synthetic training *** hyperparameters were regulated to perform model optimization,resulting in a batch size of 64,Adam optimization algorithm,learning rate of 0.01,and 80:10:10 data split ratio as the best choices of *** perfor-mance accuracy also increased with an increase in the number of samples during *** classification and regression metrics have been used to evaluate the performance of the *** paper also demonstrates the prediction performance of the optimized model using simulated and actual oil well pressure drawdown test *** proposed model achieved minimum and maximum relative errors of 0.0019 and 0.0308,respectively,in estimating output for the simulated test cases and relative error of 0.0319 for the real test case.

关键词： Well test Reservoir characterization Automatic interpretation Prediction model Hyperparameter tuning Performance indicator

Optical performance of hybrid dielectric loaded plasmonic waveguide using PTFE for nano-scale light confinement

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Optoelectronics Letters 2020年第4期16卷 284-289页

作者： Pintu kumar Dharmendra kumar Singh rakesh Ranjan Optical Fiber Communication and Photonics Lab Department of Electronics and Communication EngineeringNational Institute of Technology(NIT)PatnaPatna 800005India

Different characteristics of fundamental mode of hybrid dielectric loaded plasmonic waveguide have been explored at1550 nm wavelength,to resolve the issue of large propagation loss and diffraction limit with minimal waveguide *** length of 432μm has been achieved with the optimal dimension of 200 nm×40 *** the numerical simulation results,the effective area of 0.021μm^2 and normalized intensity of 40.71μm^-2 in the spacer region of the waveguide have been *** accomplish the ultra-compact directional coupler,the smaller coupling length of about 1.42μm has been ***-based waveguide can be highly beneficial for the realization of monolithic integration with active optical devices.

关键词： waveguide dielectric loaded

Underground mining of thick coal seams

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International Journal of Mining Science and Technology 2015年第6期25卷 885-896页

作者： kumar rakesh Singh Arun kumar Mishra Arvind kumar Singh Rajendra Central Institute of Mining and Fuel Research (CIMFR under CSIR) Indian School of Mines (ISM)

This paper reviews underground mining methods for total thickness of a thick coal seam in single lift （TI＇rCSSL）. Review shows the required engineering for extraction of thick seams needs to be fitted with thickness of the seam, behavior of rock-mass and surrounding stress conditions for efficient mining. Variants of TI＇rCSSL are able to extract a maximum 10-12 m thickness only. An improvement in bending moment of the overlying coal band in longwall top coal caving （LTCC） provides better under-winning opportunity for the roof coal band. An acceptable limit of 25 MPa compressive strength of coal for the success of LTCC may be increased under favorable geo-technical conditions. Bord and pillar in India adopted induced caving of roof coal band for single lift depillaring of total thickness （SLDTr） of a compe- tent thick coal seam developed along floor. Case studies are given to arrest the adverse effects of extrac- tion height on pillars.

关键词： Thick coal seamSingle lift depillaring of total thicknessCSmIT)Extraction heightPillar instabilityCaving of coal