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Study on characterization of bio-oil derived from sugarcane bagasse(Saccharum barberi)for application as biofuel

Clean Energy 2022年第2期6卷 297-304页

作者： Syahirah Faraheen Kabir Ahmad Umi Fazara Md Ali Khairuddin Md Isa subash cbgopinath Chemical Engineering Programme Faculty of Chemical Engineering&TechnologyUniversiti Malaysia PerlisArauMalaysia Centre of Excellence for Biomass Utilization(COEBU) Universiti Malaysia PerlisArauMalaysia

Lignocellulosic biomass especially,sugarcane bagasse Saccharum barberi sp.,appears to be a more suitable material for partial substi-tution of transport fuel(diesel)than Saccharum officinarum sp.,due to its structural similarity to transport fuel(diesel).Besides that,less research has been implemented on this type of ***-oil can be implemented as biodiesel by processing it further using chemical reactions such as hydrodeoxygenation and cracking with zeolite ***,the purpose of this study is to determine the compatibility of pyrolytic bio-oil produced from Saccharum barberi *** comparison with *** *** use as transport fuel(diesel)in automotive *** purpose can be accomplished by comparing the oil’s bio-physiochemical properties for both *** experiment is conducted on a bench-scale on which bio-oil of Saccharum barberi *** secured from the catalytic pyrolysis process at a temperature of 500°C and heating rate of 50°C/min with the addition of ZSM-Zeolite *** analysis of Saccharum barberi *** that cellulose is more reactive than lignin,evidenced by the high percentage of weight loss at tem-peratures ranging from 251°C to 390°*** high contents of carbon(40.7%)and hydrogen(6.50%),as well as slight traces of sulphur(0.08%)and nitrogen(0.85%),in bio-oil(Saccharum barberi sp.)indicate that it is conceivable to be partially used for replacement in biofuel *** physiochemical properties reveal that Saccharum barberi *** more potential than *** *** chromatography-mass spectrometry analysis reveals that bio-oil consists of high amounts of aromatic hydrocarbon(26.2%),phenol(14.8%)and furfural(13.0%)in comparison to *** sp.

关键词： sugarcane bagasse catalytic pyrolysis bio-oil physiochemical characterization biofuel

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Selective phytochemicals targeting pancreatic stellate cells as new anti-fibrotic agents for chronic pancreatitis and pancreatic cancer

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Acta Pharmaceutica Sinica B 2020年第3期10卷 399-413页

作者： Puvanesswaray Ramakrishnan Wei Mee Loh subash cbgopinath Srinivasa Reddy Bonam Ismail M.Fareez Rhanye Mac Guad Maw Shin Sim Yuan Seng Wu Ageing and Age-Associated Disorders Research Group Faculty of MedicineUniversity of MalayaKuala Lumpur 50603Malaysia Depanment of Pharmacology Faculty of MedicineUniversity of MalayaKuala Lumpur 50603Malaysia School of Bioprocess Engineering Universiti Malaysia PerlisArau 02600Malaysia Institute of Nano Electronic Engineering Universiti Malaysia PerlisKangar 01000Malaysia UMR 7242 CNRS-University of StrasbourgBiotechnology and Cell Signaling/Laboratory of Excellence MedalisIllkirch 67400France Department of Oral Biology and Biomedical Sciences Faculty of DentistryMAHSA UniversitySelangor 42610Malaysia Department of Biomedical Science and Therapeutics Faculty of Medicine and Health ScienceUniversiti Malaysia SabahKota Kinabalu 88400Malaysia Department of Pharmaceutical Life Sciences Faculty of PharmacyUniversity of MalayaKuala Lumpur 50603Malaysia Department of Biochemistry Faculty of Medicine Bioscience and NursingMAHSA UniversitySelangor 42610Malaysia

Activated pancreatic stellate cells(PSCs)have been widely accepted as a key precursor of excessive pancreatic fibrosis,which is a crucial hallmark of chronic pancreatitis(CP)and its formidable associated disease,pancreatic cancer(PC).Hence,anti-fibrotic therapy has been identified as a novel therapeutic strategy for treating CP and PC by targeting *** of the anti-fibrotic agents have been limited to phaseⅠ/Ⅱclinical trials involving vitamin analogs,which are abundant in medicinal plants and have proved to be promising for clinical *** use of phytomedicines,as new anti-fibrotic agents,has been applied to a variety of complementary and alternative *** aim of this review was to present a focused update on the selective new potential anti-fibrotic agents,including curcumin,resveratrol,rhein,emodin,green tea catechin derivatives,metformin,eruberin A,and ellagic acid,in combating PSC in CP and PC *** aimed to describe the mechanism(s)of the phytochemicals used,either alone or in combination,and the associated molecular *** of them were tested in PC models with similar mechanism of actions,and curcumin was tested *** research may explore the issues of bioavailability,drug design,and nano-formulation,in order to achieve successful clinical outcomes with promising activity and tolerability.

关键词： Pancreatic stellate cells Anti-fibrotic Chronic pancreatitis Pancreatic cancer Phytochemicals Curcumin Resverastrol Rhein Emodin Green tea catechin

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Slope stability assessment of an open pit using lattice-spring-based synthetic rock mass (LS-SRM) modeling approach

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 927-942页

作者： subash Bastola Ming Cai Branko Damjanac MIRARCO Laurentian UniversitySudburyCanada Bharti School of Engineering Laurentian UniversitySudburyCanada Key Laboratory of Ministry of Education for Safe Mining of Deep Metal Mines Northeastern UniversityShenyangChina Itasca Consulting Group Inc.MinneapolisMNUSA

Discontinuity waviness is one of the most important properties that influence shear strength of jointed rock masses,and it should be incorporated into numerical models for slope stability ***,in most existing numerical modeling tools,discontinuities are often simplified into planar *** fracture network modeling tools such as MoFrac allow the simulation of non-planar discontinuities which can be incorporated into lattice-spring-based geomechanical software such as Slope Model for slope stability *** this study,the slope failure of the south wall at Cadia Hill open pit mine is simulated using the lattice-spring-based synthetic rock mass(LS-SRM)modeling ***,the slope model is calibrated using field displacement monitoring data,and then the influence of different discontinuity configurations on the stability of the slope is *** modeling results show that the slope with non-planar discontinuities is comparatively more stable than the ones with planar *** addition,the slope becomes increasingly unstable with the increases of discontinuity intensity and *** greater pit depth with higher in situ stress,both the slope models with planar and non-planar discontinuities experience localized failures due to very high stress concentrations,and the slope model with planar discontinuities is more deformable and less stable than that with non-planar discontinuities.

关键词： Lattice-spring-based synthetic rock mass (LS-SRM)modeling Non-planar discontinuities Slope stability Slope model Discrete fracture network(DFN)modeling

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Geospatial analysis of forest fragmentation in Uttara Kannada District, India

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Forest Ecosystems 2016年第3期3卷 206-220页

作者： Ramachandra T V Bharath Setturu subash Chandran Energy & Wetlands Research Group Center for Ecological Sciences（CES） Indian Institute of Science Centre for Sustainable Technologies (astra) Bangalore Karnataka 560 012 India Centre for infrastructure Sustainable Transportation and Urban Planning（CiSTUP） Indian Institute of Science Bangalore Karnataka 560 012 India

Background： Landscapes consist of heterogeneous interacting dynamic elements with complex ecological, economic and cultural attributes. These complex interactions help in the sustenance of natural resources through bio-geochemical and hydrological cycling. The ecosystem functions are altered with changes in the landscape structure, Fragmentation of large contiguous forests to small and isolated forest patches either by natural phenomena or anthropogenic activities leads to drastic changes in forest patch sizes, shape, connectivity and internal heterogeneity, which restrict the movement leading to inbreeding among Meta populations with extirpation of species. Methods： Landscape dynamics are assessed through land use analysis by way of remote sensing data acquired at different time periods. Forest fragmentation is assessed at the pixel level through computation of two indicators, i.e., Pf （the ratio of pixels that are forested to the total non-water pixels in the window） and P~ （the proportion of all adjacent （cardinal directions only） pixel pairs that include at least one forest pixel, for which both pixels are forested）. Results： Uttara Kannada District has the distinction of having the highest forest cover in Karnataka State, India. This region has been experiencing changes in its forest cover and consequent alterations in functional abilities of its ecosystem. Temporal land use analyses show the trend of deforestation, evident from the reduction of evergreen - semi evergreen forest cover from 57.31% （1979） to 32.08 % （2013） Forest fragmentation at the landscape level shows a decline of interior forests 64.42 % （1979） to 25.62 % （20] 3） and transition of non-forest categories such as crop land, plantations and built-up areas, amounting now to 47.29 %. PCA prioritized geophysical and socio variables responsible for changes in the landscape structure at local levels. Conclusion： Terrestrial forest ecosystems in Uttara Kannada District of Central Western Ghats have be

关键词： Land use dynamics Forest fraqmentation Interior forests Biodiversity Geophysical variables

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Enhancement of current density using effective membranes electrode assemblies for water electrolyser system

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Journal of Energy Chemistry 2016年第1期25卷 77-84页

作者： Swaminathan Seetharaman subash Chandrabose Raghu Kambiz Ansari Mahabadi Institute of Materials Research & Engineering A*STAR (Agency for Science Technology and Research) 3 Research Link Singapore 117 602 Singapore School of Civil and Environmental Engineering Nanyang Technological University Block N1 Nanyang Avenue Singapore 639 798 Singapore

The goal of this study was to develop and design a composite proton exchange membrane（PEM） and membrane electrode assembly（MEA） that are suitable for the PEM based water electrolysis system. In particular,it focuses on the development of sulphonated polyether ether ketone（SPEEK） based membranes and caesium salt of silico-tungstic acid（Cs Si WA） matrix compared with one of the transition metal oxides such as titanium dioxide（TiO2）, silicon dioxide（SiO2） and zirconium dioxide（ZrO2）. The resultant membranes have been characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, ion exchange capacity（IEC）, water uptake and atomic force microscopy. Comparative studies on the performance of MEAs were also conducted utilizing impregnation-reduction and conventional brush coating methods. The PEM electrolysis performance of SPEEK-Cs Si WA-ZrO2 composite membrane was more superior than that of other membranes involved in this study. Electrochemical characterization shows that a maximum current density of 1.4 A/cm^2 was achieved at 60 °C, explained by an increased concentration of protonic sites available at the interface.

关键词： Composite membrane Membrane electrode assembly Impregnation reduction method Brush coating method Electrolysis

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Indium antimonide based HEMT for RF applications

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Journal of Semiconductors 2014年第11期35卷 20-22页

作者： T.D.subash T.Gnanasekaran K.N.S.K College of Engineering Nagercoil-629901India RMK College of Engineering and Technology Tamil Nadu601206India

We report on an indium antimonide high electron mobility transistor with record cut-off frequency characteristics. For high frequency response it is important to minimize parasitic resistance and capacitance to improve short-channel effects. For analog applications adequate pinch-off behavior is demonstrated. For proper device scaling we need high electron mobility and high electron density. Toward this end, the device design features and simulation are carried out by the Synopsys TCAD tool. A 30 nm InSb HEMT exhibits an excellent cut-off frequency of 586 GHz. To the knowledge of the authors, the obtained cut-off frequency is the highest ever reported in any FET on any material system.

关键词： HEMT InSb gate length cut-off frequency short-channel effects

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Skyhook-based Semi-active Control of Full-vehicle Suspension with Magneto-rheological Dampers

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Chinese Journal of Mechanical Engineering 2013年第3期26卷 498-505页

作者： ZHANG Hailong WANG Enrong MIN Fuhong subash Rakheja SU Chunyi School of Electric and Automation Engineering Nanjing Normal University Department of Mechanical Engineering Concordia University

The control study of vehicle semi-active suspension with magneto-rheological (MR) dampers has been attracted much attention internationally. However, a simple, real time and easy implementing semi-active controller has not been proposed for the MR full-vehicle suspension system, and a systematic analysis method has not been established for evaluating the multi-objective suspension performances of MR full-vehicle vertical, pitch and roll motions. For this purpose, according to the 7-degree of freedom (DOF) fullvehicle dynamic system, a generalized 7-DOF MR and passive full-vehicle dynamic model is set up by employing the modified Boucwen hysteretic force-velocity (F-v) model of the MR damper. A semi-active controller is synthesized to realize independent control of the four MR quarter-vehicle sub-suspension systems in the full-vehicle, which is on the basis of the proposed modified skyhook damping scheme of MR quarter-vehicle sub-suspension system. The proposed controller can greatly simplify the controller design complexity of MR full-vehicle suspension and has merits of easy implementation in real application, wherein only absolute velocities of sprung and unsprung masses with reference to the road surface are required to measure in real time when the vehicle is moving. Furthermore, a systematic analysis method is established for evaluating the vertical, pitch and roll motion properties of both MR and passive full-vehicle suspensions in a more realistic road excitation manner, in which the harmonic, rounded pulse and real road measured random signals with delay time are employed as different road excitations inserted on the front and rear two wheels, by considering the distance between front and rear wheels in full-vehicle. The above excitations with different amplitudes are further employed as the road excitations inserted on left and right two wheels for evaluating the roll motion property. The multi-objective suspension performances of ride comfort and handling

关键词： magneto-rheological damper skyhook policy semi-active control multi-objective performances full-vehicle suspension

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Pointing fingers at blood contact:mechanisms of subventricular zone neural stem cell differentiation

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Neural Regeneration Research 2023年第1期18卷 137-138页

作者： subash C.Malik Yu-Hsuan Chu Christian Schachtrup Institute of Anatomy and Cell Biology Faculty of MedicineUniversity of FreiburgFreiburgGermany Faculty of Biology University of FreiburgFreiburgGermany Center for Basics in NeuroModulation(NeuroModulBasics) Faculty of MedicineUniversity of FreiburgFreiburgGermany

The limited ability of the central nervous system(CNS)to regenerate in adult mammals after injury or disease is a significant ***,neural stem/progenitor cells(NSPCs)offer great promise for regenerating the *** or transplanted NSPCs contribute to repair processes,but their differentiation and function are abnormal in CNS injury and *** main reasons for these abnormalities are changes in the extracellular environment in the injured CNS that affect signaling pathways and transcriptional regulation in NSPCs.

关键词： ventricular neural injury

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Influence of local stiffeners and cutout shapes on the vibration and stability characteristics of quasi-isotropic laminates under hygro-thermo-mechanical loadings

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Defence Technology（防务技术） 2022年第12期18卷 2107-2124页

作者： T.Rajanna K.S.subash Chandra K.Venkata Rao Department of Civil Engineering B.M.S College of EngineeringBengaluru560019India Research Scholar B.M.S College of EngineeringBengaluru560019India Department of Mechanical Engineering B.M.S Evening College of EngineeringBengaluru560019India Department of Mechanical Engineering Government PolytechnicBagepalli561207India

The perforated stiffened panel is generally found as a sub-component of sophisticated *** fundamental purpose of this panel is to withstand against buckling under complicated loading and environmental ***,an accurate knowledge of critical buckling behaviour of stiffened panels is very much essential for a reliable and lightweight structural *** this paper,the focus is on quasi-laminated panels with different cutout shapes of various sizes and their responses to hygrothermal environments under nonlinearly varying edge loads and is compared with the locally stiffened *** this,the modelling of the panel and stiffener is done by adopting nine-noded heterosis plate elements and three noded beam elements *** stiffener formulation is suitably modified in order to take the torsional effect also into consideration along with the effect of shear ***,the plate and the stiffener elements are treated separately,and then the displacement compatibility is maintained between them by using the transformation *** a given loading and geometric discontinuity,the stress distribution within the perforated panel is highly non-uniform in nature and hence a dynamic approach has been used to calculate buckling loads by adopting two sets of boundary conditions,one set for pre-buckling stress analysis and the second set for buckling *** different quasi-isotropic stacking sequences are deliberated in this work by varying different ply-orientation in each *** study also addresses the effect of various parameters such as nonlinear loads,hygro-thermal loads,cutout size and shapes,position of cutout,stiffener parameters,stacking sequences,thickness of plate and boundary conditions.

关键词： Locally stiffened panels Buckling Vibration Cutouts Heterosis Hygrothermal environment

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Dynamic behavior of sandwich beams with different compositions of magnetorheological fluid core

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International Journal of Smart and Nano Materials 2021年第1期12卷 88-106页

作者： subash Acharya Vipin J Allien Puneet N P Hemantha Kumar Department of Mechanical Engineering NITK SurathkalMangaloreKarnatakaIndia

Magnetorheological fluid(MRF)sandwich beams belong to a class of adaptive beams that consists of MRF sandwiched between two or more face layers and have a great prospective for use in semi-active control of beam vibrations due to their superior vibration suppression *** composition of MRF has a strong influence on the MRF properties and hence affects the vibration characteristics of the *** this work,six MRF samples(MRFs)composed of combination of two particle sizes and three weight fractions of carbonyl iron pow-der(CIP)were prepared and their viscoelastic properties were *** MRFs were used to fabricate different MRF core sandwich ***,a sandwich beam with commer-cially available MRF 132DG fluid as core was *** modal parameters of the cantilever MRF sandwich beams were determined at different magnetic ***,sinusoidal sweep excitation tests were performed on these beams at different magnetic fields to investigate their vibration suppres-sion *** having larger particle size and higher weight fraction of CIP resulted in higher damping ratio and vibration ***,optimal particle size and weight fraction of CIP were determined based on the maximization of damping ratio and minimization of weight of MRF.

关键词： Smart materials adaptive sandwich beam damping ratio vibration suppression complex shear modulus

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