检索结果-南通市图书馆

Advances in Chemical Engineering and Science 2011年第4期1卷 289-298页

作者： Chong-Wan Cheng Rahmath Abdulla Rao. Rampally sridhar Pogaku Ravindra 不详

In this study, a simple and effective technique for establishing an external mass transfer model in a recirculated packed-bed batch reactor (RPBBR) with an immobilized lipase enzyme and Jatropha oil system is presented. The external mass transfer effect can be represented with a model in the form of Colburn factor JD = K Re-(1–n). The value of K and n were derived from experimental data at different mass flow *** experiment shows an average increment of 1.51% FFA for calcium alginate and 1.62% FFA for carrageenan after the hydrolysis took place. Based on different biopolymer material used in immobilized beads, JD = 1.674 Re-0.4 for calcium alginate and JD = 1.881 Re-0.3 for k-carrageenan were found to be adequate to predict the experimental data for external mass transfer in the reactor in the Reynolds number range of 0.2 to 1.2. The purposed model can be used for the design of industrial bioreactor and scale up. Besides, the external mass transfer coefficients for the hydrolysis of Jatropha oil reaction and the entrapment efficiency for the two biopolymer materials used were also investigated.

关键词： Pseudomonas Cepacialipase Jatropha Curcas L. Oil Carrageenan Calcium Alginate Hydrolysis Packed Bed Reactor Immobilized Enzyme External Film Diffusion

Mechanical behavior of organo-modified Indian bentonite nanoclay fiber-reinforced plastic nanocomposites

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2013年第4期7卷 396-404页

作者： N. RAGHAVENDRA H. N. NARASIMHA MURTHY M. KRISHNA K. R. VISHNU MAHESH R. sridhar S. FIRDOSH G. ANGADI S. C. SHARMA Center for Manufacturing and Research Technology Utilization R. V. College Campus Bangalore 560059 Karnataka India Department of Mechanical Engineering R. V. College of Engineering Bangalore 560059 Karnataka India Department of Chemistry ACS College of Engineering Bangalore 560074 Karnataka India Tumkur University Tumkur 572103 Karnataka India

The aim of the research was to examine the influence of organo-modified Indian bentonite （IB） nanoclay dispersed in vinyisster on the mechanical properties of nanoclaylvinylesterlglass nanocomposRes. Nanoclay was organically modified using cationic surfactant hexadecyltrimethylammonium bromide （HDTMA-Br） by cation exchange method and dispersed in vinylester using ultrasonication and twin screw extrusion. XRD of nanoclaylvinylester revealed exfoliaUon at 4 wt.% nanoclay indicating uniform dispersion in the polymer. DSC results showed improvement in glass transition temperature by 22.3% in 4 wt.% nanoclaylvinylester/glass when compared with that of vinylester/glass. Nanoclay/vinylester/glass with 4 wt,% nanoclay showed 29.23%, 23.84% and 60.87% improvement in ultimate tensile strength （UTS）, fiexural strength （FS） and interlaminar shear strength （ILSS） respectively when compared with those of vinylester! glass. The mode of tensile failure examined by SEM showed no agglomeration of nanoclay in 4 wt.% nanoclayNinylester/glass specimens.

关键词： Indian bentonite (IB) ultrasonication twin-screw extrusion mechanical property

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

弹性机翼起航

科技纵览 2016年第9期 26-31页

作者： sridhar Kota

一个多世纪以前。最早的一批航空先驱想出了使用带襟翼的刚性机翼来产生足够动力的方法，将笨重的飞机送上天空。这是人类历史上最伟大的进步之一，亦开创了一个交通新时代。飞机以及以飞机为依托的航空业现在已成为世界上最大的产业之... 详细信息

一个多世纪以前。最早的一批航空先驱想出了使用带襟翼的刚性机翼来产生足够动力的方法，将笨重的飞机送上天空。这是人类历史上最伟大的进步之一，亦开创了一个交通新时代。飞机以及以飞机为依托的航空业现在已成为世界上最大的产业之一。航空旅行每年创造的收入超过7000亿美元。

关键词：弹性机翼航空业人类历史飞机襟翼

Feature Extraction by Multi-Scale Principal Component Analysis and Classification in Spectral Domain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering（科研） 2013年第10期5卷 268-271页

作者： Shengkun Xie Anna T. Lawnizak Pietro Lio sridhar Krishnan Computer Laboratory University of Cambridge Cambridge UK Department of Mathematics and Statistics University of Guelph Guelph Canada Electrical and Computer Engineering Ryerson University Toronto Canada Global Management Studies Ryerson University Toronto Canada

Feature extraction of signals plays an important role in classification problems because of data dimension reduction property and potential improvement of a classification accuracy rate. Principal component analysis (PCA), wavelets transform or Fourier transform methods are often used for feature extraction. In this paper, we propose a multi-scale PCA, which combines discrete wavelet transform, and PCA for feature extraction of signals in both the spatial and temporal domains. Our study shows that the multi-scale PCA combined with the proposed new classification methods leads to high classification accuracy for the considered signals.

关键词： Multi-Scale Principal Component Analysis Discrete Wavelet Transform Feature Extraction Signal Classification Empirical Classification

Areal Extent of Erosion and Accretion in and around the Gahirmatha Coast, NW of Bay of Bengal by Remote Sensing and GIS Analysis of Multi-Temporal Satellite Imagery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Geosciences 2015年第7期6卷 705-719页

作者： Balabathina Veeraanarayanaa Kandula Ravikumar Talluri Ramesh Mopada Venkateswararao Pattam N. sridhar P.I SYS-SERC Department of Science & Technology New Delhi India Department of Geology Andhra University Waltair India Department of Geography Andhra University Waltair India National Remote Sensing Agency Department of Space ISRO Hyderabad India

The shoreline morphology change due to erosion and deposition is a major concern for coastal zone management. In the present study, a highly dynamic coast of Gahirmatha on Bay of Bengal? in northeast India is experiencing active erosion, which is mainly wave and tide erosion related hazard threat ending human habitation and sustainability of the coast. In our study, high resolution satellite imagery of time series provided detailed sequence of coastal morphology and their changes in all respects. Comparison study of relative shoreline positions on time series satellite data spanning?three decades from 1973 to 2004 covering for the years of 1973, 1983, 1987, 1990, 1998, 2000 and 2004, provided regional changes with accelerated erosion and accretion. The result of the studies?have revealed that the areas of severe erosion found along the coast are confined to the promontories of the present day mouths itself of the Baitrani at Dhamra and Brahmani at Maipura inlets. In this background, it is significant to understand the magnitude of factors that are responsible for prograding or retrograding of coast. The present study is an attempt in this direction.

关键词： Accretion Erosion Morphology Coast Temporal Satellite Data

Human butyrylcholinesterase knock-out equivalent: Potential to assess role in Alzheimer’s disease

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Alzheimer's Disease 2012年第1期1卷 1-11页

作者： Gumpeny Ramachandra sridhar Talluri Sekhar Padmanabhuni Venkata Nageswara Rao Allam Appa Rao C. R. Rao Advanced Institute for Mathematics Statistics & Computer Science (AIMSCS) Hyderabad India Department of Biotechnology GITAM University Visakhapatnam India Department of Computer Science GITAM University Visakhapatnam India Endocrine and Diabetes Center Visakhapatnam India

Butyrylcholinesterase (BChE) is an enzyme which has been shown to be involved in the patho-genesis, treatment and prognosis of Alzheimer’s disease. In its current form, however, evidence is equivocal with all of the associations. Variant forms of the protein exist, where the enzymatic function is lost to varying degrees. We performed in silico evaluation of these variants. Bioinformatics and molecular modeling, based on data from ESTHER database and Protein Data Bank (RCSB), were used for in silico predictions of the structures of the silent variants that involve a single amino acid change. Variants with loss of enzyme activity were evaluated for structural changes near the active site and the thermody-namic stability of the variants was estimated. The results indicated that the loss of activity of the variants can, in most cases, be attributed to structural changes in the active site or to lower thermodynamic stability. Our results showed that the loss of enzyme activity may be due to changes in the active site, oligomerization or loss of structural stability. Individuals with loss of function mutation of BChE can be studied and followed up for their proneness or resistance to cognitive decline with aging.

关键词： Apnea Anesthesia Insulin Resistance Mutants Thermal Stability

Impact of Sand Mining and Sea Reclamation on the Environment and Socioeconomic Activities of Ikate and Ilubirin Coastal Low Income Communities in Lagos Metropolis, Southwestern Nigeria

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 Geoscience and Environment Protection 2019年第2期7卷 190-205页

作者： Mynepalli Kameswara Chandra sridhar Godson Rowland Ewa Ekpenyong Ana Temitope Ayodeji Laniyan Department of Environmental Health Sciences Faculty of Public Health College of Medicine University of Ibadan Ibadan Nigeria

Land reclamation is gradually posing negative impact on man due to unplanned urbanization. A study was carried out on impact of land reclamation through sand mining of coastal communities in Ikate and Ilubirin in Lagos, Nigeria. Ten waters (8 surface and 2 groundwater sources), 10 soil samples and air were collected and taken for analysis. Results of water revealed concentrations lower than WHO (2017) and SON (2007) standards. Soil/sediment with average crustal value revealed Pb and Cd above standard values, which is attributed to anthropogenic influence on soils. Quality of air in the study was mainly particulate matter arising from the sea and reclaimed land in the surroundings of the environment with the highest Total Suspended Particulate of 0.8 mg/m3 in sulfur dioxide. This explains corrosion found on the roofs of the communities. Therefore, in the development planning adequate precautions should be put in place to avert environmental degradation.

关键词： Land Reclamation Coastal Areas Sand Mining Environmental Impact Water Quality Air Pollution

Detection of Chondromalacia Patellae by Analysis of Intrinsic Mode Functions in Knee-Joint Vibration Signals

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 Biomedical Engineering(English Edition) 2014年第2期23卷 80-86页

作者： WU Yun-feng CAI Su-xian XU Fang SHI Lei sridhar Krishnan Department of Communication Engineering School of Information Science and Technology Xiamen University Department of Orthopedics Zhongshan Hospital Xiamen University Department of Electrical and Computer Engineering Ryerson University

This paper presents the knee-joint vibration signal processing and pathological localization procedures using the empirical mode decomposition for patients with chondrom alacia *** artifacts of baseline wander and random noise were identified in the decomposed monotonic trend and intrinsic mode functions (IMF) using the modeling method of probability density function and the confidence limit ***, the fluctuation parts in the signal were detected by the signal method turning for count. The results demonstrated that the quality of reconstructed signal can be greatly improved, with the removal of the baseline wander(adaptive trend) and the Gaussian distributed random noise. By detecting the turn signals in the artifact-free signal, the pathological segments related to chondrom alacia patellae can be effectively localized with the beginning and ending points of the span of turn signals.

关键词： knee-joint disorders vibration arthrometry empirical mode decomposition chondromalacia patellae

Rapid LC-ESI-MS-MS Method for the Simultaneous Determination of Sitagliptin and Pioglitazone in Rat Plasma and Its Application to Pharmacokinetic Study

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2012年第12期3卷 849-858页

作者： Samanthula Gananadhamu Vaddepally Laxmikanth Saladi Shantikumar Veeraraghavan sridhar Caringula Geetha Chennupati Sandhya Department of Pharmaceutical Analysis National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad India Drug Metabolism and Pharmacokinetics Department Incozen Therapeutics Private Limited Hyderabad India

A liquid chromatography tandem mass spectrometry (LC-MS/MS) based method was developed for the simultaneous monitoring plasma levels of Sitagliptin (STG) and Pioglitazone (PIO) for applicability to pharmacokinetic studies. The method was based on HPLC separation on the reversed phase Phenomenex Synergy C18 column (30 mm length, 4.6 mm internal diameter, and 4.0 μm particle size) at a temperature of 40?C using a binary gradient mobile phase consisting of methanol and 2 mM ammonium acetate buffer pH adjusted to 4.5 with acetic acid, at a flow rate of 1 mL?min?1. Tolbutamide was used as an internal standard. Detection of analytes was achieved with LC-MS/MS system in Multiple Reaction Monitoring (MRM) mode. The method was validated over concentration range of 10.98 - 2091.77 ng?mL?1 for SIT and 8.25 - 1571.63 ng?mL?1 for PIO and lower limit of quantification was 10.98 ng?mL?1 and 8.25 ng?mL?1 for STG and PIO respectively. Recoveries from spiked controls were within acceptance criteria for all the analytes and internal standard at all QC levels. Within batch and between batch accuracy for STG was found within 96.9% - 100.3% and for PIO was found within 100.0% - 104.3%. Within batch and between batch precision for STG was less than 3.1% CV (coefficient of variation) and for PIO was less than 5.3% CV at all concentrations levels. This method was successfully applied to monitor pharmacokinetics profile of both STG and PIO on simultaneous oral administration to rats. This method can be applicable for pharmacokinetic drug-drug interaction studies.

关键词： Sitagliptin Pioglitazone LC-MS/MS Bioanalytical Method Validation

Hazard Identification and Risk Assessment-Based Water Safety Plan for Packaged Water Production Companies in Abeokuta, South West Nigeria

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 Protection 2020年第1期11卷 48-63页

作者： Boluwatife Olusegun Osikanmi Mohammed Mustapha Mynepalli Kameswara Chandra sridhar Akinwale Oladotun Coker Department of Civil Engineering Faculty of Technology University of Ibadan Ibadan Nigeria Department of Agricultural and Environmental Resources Engineering University of Maiduguri Maiduguri Nigeria Department of Environmental Health Sciences Faculty of Public Health University of Ibadan Ibadan Nigeria

Provision of quality drinking water is paramount for sustaining good public health in urban residents. Packaged water produced and consumed across cities in Nigeria lacks integrity in protecting Health. Water safety plan based on hazard identification and risk assessment in each component of the water production system is essential in providing quality water by packaged water producing companies in Nigeria. This study aims at developing water safety plan for selected packaged water manufacturing companies in Abeokuta, Ogun State, Nigeria. Hazard identification and risk assessment were carried out based on site inspection studies, key informant interview, questionnaire survey and water sample analysis, and risk analysis using semi-quantitative risk matrix approach. The results revealed a total of 26 possible hazardous events which may compromise water quality such as on-site septic tanks and effluents discharged at source water and improper maintenance and hygiene practices within the system. Based on these, appropriate mitigation and monitoring plans were drawn for action. The research found that water safety plan is feasible for the packaged water systems, and therefore calls on the relevant stakeholders for urgent implementation towards ensuring clean drinking water and protecting public health as more and more people are opting for packaged waters due to uncertain public water safety.

关键词： Risk Management Water Safety Plan Packaged Water Abeokuta