检索结果-南通市图书馆

Chinese Journal of Chemical Engineering 2019年第5期27卷 1094-1102页

作者： Jay Sompura Amit Joshi Babji srinivasan Rajagopalan srinivasan Department of Electrical Engineering Indian Institute of Technology GandhinagarIndia Department of Chemical Engineering Indian Institute ofTechnology GandhinagarIndia Department of Chemical Engineering Indian Institute ofTechnology MadrasIndia

Process safety in chemical industries is considered to be one of the important goals towards sustainable development. This is due to the fact that, major accidents still occur and continue to exert significant reputational and financial impacts on process industries. Alarm systems constitute an indispensable component of automation as they draw the attention of process operators to any abnormal conditi on in the plant. Therefore, if deployed properly, alarm systems can play a critical role in helping plant operators ensure process safety and profitability. How-ever, in practice, many process plants suffer from poor alarm system configuration which leads to nuisance alarms and alarm floods that compromise safety. A vast amount of research has primarily focused on developing sophisticated alarm management algorithms to address specific issues. In this article, we provide a simple, practical, systematic approach that can be applied by plant engineers (i.e., non-experts) to improve industrial alarm system performance. The proposed approach is demonstrated using an industrial power plant case study.

关键词： Chattering alarm Correspondence analysis Density based clustering Duplicate alarms Combined-cycle power plant Association rule mining

Studies on thermally grown oxide as an interface between plasma-sprayed coatings and a nickel-based superalloy substrate

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2017年第6期24卷 681-690页

作者： Adam Khan Mahaboob Basha Sundarrajan srinivasan Natarajan srinivasan Department of Mechanical Engineering Centre for Surface Engineering Kalasalingam University Krishnankoil 626126 Tamil Nadu India Department of Metallurgical and Materials Engineering National Institute of Technology Tiruchirapalli 620015 Tamil Nadu India Centre of Excellence in Corrosion and Surface Engineering (CECASE) National Institute of Technology Tiruchirapalli 620015 Tamil Nadu India

A thermally grown oxide layer formed by hot corrosion was investigated as an interface between plasma-sprayed coatings and a nickel-based superalloy substrate. The hot corrosion mechanism of NiCr–Cr_2O_3 and Al_2O_3–40wt% TiO_2(A40T) plasma coated Inconel 617 was evaluated. The experiments were carried out at 1000°C using a combination of Na_2SO_4, NaCl, and V_2O_5 salts to simulate the conditions of a gas turbine in a marine environment. The hot corrosion results revealed the spallation and dissolution of oxides upon prolonged exposure. Optical images and scanning electron micrographs of the exposed samples revealed the formation of oxide scale and provided details of its morphology in NiCr–Cr_2O_3 coated samples. Microstructure characterization of A40T coatings demonstrated a thermally grown oxide(TGO) layer at 1000°C. Increasing the thickness of the TGO layer decreased the corrosion resistance. The elemental analysis and image mapping revealed the migration of active elements from the substrate and coatings toward the corrosive environment.

关键词： corrosion coatings superalloy oxides

Prostate cancer epigenetics and its clinicalmplications

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2016年第4期18卷 549-558页

作者： srinivasan Yegnasubramanian Sidney Kimmel Comprehensive Cancer Center Department of Oncology Johns Hopkins University School of Medicine Baltimore Maryland USA

Normal cells have a level of epigenetic programming that is superimposed on the genetic code to establish and maintain their cell identity and phenotypes. This epigenetic programming can be thought as the architecture, a sort of cityscape, that is built upon the underlying genetic landscape. The epigenetic programming is encoded by a complex set of chemical marks on DNA, on histone proteins in nucleosomes, and by numerous context-specific DNA, RNA, protein interactions that all regulate the structure, organization, and function of the genome in a given cell. It is becoming increasingly evident that abnormalities in both the genetic landscape and epigenetic cityscape can cooperate to drive carcinogenesis and disease progression. Large-scale cancer genome sequencing studies have revealed that mutations in genes encoding the enzymatic machinery for shaping the epigenetic cityscape are among the most common mutations observed in human cancers, including prostate cancer. Interestingly, although the constellation of genetic mutations in a given cancer can be quite heterogeneous from person to person, there are numerous epigenetic alterations that appear to be highly recurrent, and nearly universal in a given cancer type, including in prostate cancer. The highly recurrent nature of these alterations can be exploited for development of biomarkers for cancer detection and risk stratification and as targets for therapeutic intervention. Here, we explore the basic principles of epigenetic processes in normal cells and prostate cancer cells and discuss the potential clinical implications with regards to prostate cancer biomarker development and therapy.

关键词： biomarkers DNA methylation epigenetics epigenomics prostatic neoplasms tumor

OKRA (HIBISCUS ESCULENTUS) AND FENUGREEK (TRIGONELLA FOENUM GRACEUM) MUCILAGE:CHARACTERIZATION AND APPLICATION AS FLOCCULANTS FOR TEXTILE EFFLUENT TREATMENTS

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

Chinese Journal of Polymer Science 2008年第6期26卷 679-687页

作者： Rajani srinivasan Anuradha Mishra Blackland Research and Extension Centre Texas A&M University System720East Blackland RoadTempleTX76502USA Department of Chemistry University Institute of Engineering and TechnologyCSJM UniversityKanpur-208 024India

The use of new food grade polysaccharides (mucilage) obtained from Hibiscus esculentus and Trigonella foenum graceum,commonly called Okra and Fenugreek,respectively,as flocculants was *** polysaccharides were used for removal of solids (suspended solids (SS) and total dissolved solids (TDS)) and dyes from real textile effluents and aqueous solutions of different class of synthetic *** of varying polysaccharide concentration,contact time and pH on removal of pollutant from the textile...

关键词： Fenugreek Okra Natural polysaccharides Flocculation Wastewater treatment Textile effluent Bridging Hibiscus esculentus Trigonella foenum graceum.

Strength Characteristics of Treated Soil with Proposed Layer Formation

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 117-135页

作者： N Sivakumar A Mandal srinivasan venkatraman Department of Civil Engineering Visvesvaraya National Institute of TechnologyNagpur-440010India

The engineering characteristics of the soil,soil-fly ash and fly ash-lime,were examined to utilize as base layer material in civil *** influence of fly ash percentage and the effect of curing on California bearing ratio(CBR)and unconfined compressive strength(UCS),of soil and soil-fly ash mixing and layered system were examined to estimate the optimum *** volumetric swelling of the optimal mixture was estimated to be within the allowable *** microscope analysis and X-ray diffraction tests were performed.A model test analyses with three layers were conducted by finite element method and stress-strain behavior was observed.

关键词： Scanning electron microscopy simulation sustainable materials waste reduction X-ray diffraction

Cumin(Cuminum cyminum)and black cumin(Nigella sativa)seeds:traditional uses,chemical constituents,and nutraceutical effects

在线全文

学校读者我要写书评

暂无评论

Food Quality and Safety 2018年第1期2卷 1-16页

作者： Krishnapura srinivasan Department of Biochemistry CSIR-Central Food Technological Research InstituteMysoreIndia

Although the seeds of cumin(Cuminum cyminum L.)are widely used as a spice for their distinctive aroma,they are also commonly used in traditional medicine to treat a variety of *** literature presents ample evidence for the biomedical activities of cumin,which have generally been ascribed to its bioactive constituents such as terpenes,phenols,and *** health effects of cumin seeds that are experimentally validated are discussed in this *** seeds(Nigella sativa),which are totally unrelated to ***,have nevertheless taken the name‘Black cumin’and used in traditional systems of medicine for many *** pre-clinical and clinical trials have investigated its efficacy using the seed oil,essential oil,and its main constituent thymoquinone(TQ).These investigations support its use either independently or as an adjunct along with conventional drugs in respiratory problems,allergic rhinitis,dyspepsia,metabolic syndrome,diabetes mellitus,inflammatory diseases,and different types of human *** studies made in the last decades validate its health beneficial effects particularly in diabetes,dyslipidemia,hypertension,respiratory disorders,inflammatory diseases,and *** sativa seeds also possess immune stimulatory,gastroprotective,hepatoprotective,nephroprotective,and neuroprotective *** is the most abundant constituent of volatile oil of *** seeds,and most of the medicinal properties of *** are attributed mainly to *** the available evidence suggests that TQ should be developed as a novel drug in clinical trials.

关键词： Cuminum cyminum Nigella sativa digestive stimulant antidiabetic anti-inflammatory cancer preventive immune stimulatory gastroprotective

Treatment of taste and odor causing compounds 2-methyl isoborneol and geosmin in drinking water:A critical review

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 Environmental Sciences 2011年第1期23卷 1-13页

作者： Rangesh srinivasan George A.Sorial Environmental Engineering Program School of EnergyEnvironmentalBiologicaland Medical EngineeringUniversity of CincinnatiCincinnatiOH 45221-0012USA

Problems due to the taste and odor in drinking water are common in treatment facilities around the world. Taste and odor are perceived by the public as the primary indicators of the safely and acceptability of drinking water and are mainly caused by the presence of two semi-volatile compounds - 2-methyl isobomeol （MIB） and geosmin. A review of these two taste and odor causing compounds in drinking water is presented. The sources for the formation of these compounds in water are discussed alongwith the health and regulatory implications. The recent developments in the analysis of MIB/geosmin in water which have allowed for rapid measurements in the nanogram per liter concentrations are also discussed. This review focuses on the relevant treatment alternatives, that are described in detail with emphasis on their respective advantages and problems associated with their implementation in a full- scale facility. Conventional treatment processes in water treatment plants, such as coagulation, sedimentation and chlorination have been found to be ineffective for removal of M1B/geosmin. Studies have shown powdered activated carbon, ozonation and biofiltration to be effective in treatment of these two compounds. Although some of these technologies are more effective and show more promise than the others, much work remains to be done to optimize these technologies so that they can be retrofitted or installed with minimal impact on the overall operation and effectiveness of the treatment system.

关键词： adsorption drinking water geosmin 2-methyl isoborneol (MIB) odor taste

Variation of Flow Field Around Twin Cylinders with and Without the Outer Perforated Cylinder ? Numerical Study

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2016年第5期30卷 763-771页

作者： Chandrasekaran srinivasan N.MADHAVI Department of Ocean Engineering Indian Institute of Technology Madras Department of Ocean Engineering IIT Madras

Presence of the outer perforated cylinder reduces the direct wave impact on the inner cylinder, which has been testified by many researchers. However, the force reduction mechanism, which is complicated due to the wave-porous structure interaction, needs to be addressed in detail. The present study explains the mechanism with the aid of the computational fluid dynamics （CFD） tool STAR CCM＋. This package is chosen for its capabilities to simulate viscous and turbulence effects caused by passage of waves. For the present study, flow fields around the twin cylinders with different orientations are examined with and without the outer perforated cover. Mechanism contributing to the reduction of force on the existing structure is explained in physical terms, and force reduction is quantified. The present study has direct application in the retrofitting application of offshore members.

关键词： CFD offshore structure perforated cylinder hydrodynamic force water particle kinematics twin cylinders

Effect of Heat Input on Fume Generation and Joint Properties of Gas Metal Arc Welded Austenitic Stainless Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第10期18卷 72-79页

作者： K srinivasan V Balasubramanian Department of Manufacturing Engineering Annamalai University

The effect of heat input on fume and their compositions during gas metal arc welding （GMAW） of AISI 316 stainless steel plates are investigated. Fume generation rate （FGR） and fume percentage were determined by ANSI/AWS F1.2 methods. Particle characterization was performed with SEM-XEDS and XRF analysis to reveal the particle morphology and chemical composition of the fume particles. The SEM analysis reveals the morphology of particles having three distinct shapes namely spherical, irregular, and agglomerated. Spherical particles were the most abundant type of individual particle. All the fume particle size falls in the range of less than 100 nm. Mechanical properties （strength, hardness and toughness） and microstructural analysis of the weld deposits were evaluated. It is found that heat input of 1.15 kJ/mm is beneficial to weld stainless steel by GMAW process due to lower level of welding fume emissions and superior mechanical properties of the joints.

关键词： gas metal arc weldings fume generation rates austenitic stainless steels tensile property scanning electron microscopes X-ray florescence spectrometer