检索结果-南通市图书馆

World Journal of Gastrointestinal Endoscopy 2023年第3期15卷 122-132页

作者： sridhar Sundaram Aditya kale Department of Digestive Diseases and Clinical Nutrition Tata Memorial HospitalHomi Bhabha National Institute MumbaiMumbai 400012MaharashtraIndia Department of Gastroenterology Seth GS Medical College and King Edward Memorial HospitalMumbai 400012India

Endoscopic retrograde cholangiopancreatography(ERCP)is the preferred modality for drainage of the obstructed biliary *** patients with surgically altered anatomy,ERCP using standard techniques may not be *** assisted ERCP is usually employed with variable success *** advent of endoscopic ultrasound(EUS),biliary drainage procedures in patients with biliary obstruction and surgically altered anatomy is safe and *** this narrative review,we discuss role of EUS guided biliary drainage in patients with altered anatomy and the various approaches used in patients with benign and malignant biliary obstruction.

关键词： Endoscopic ultrasound guided biliary drainage Surgically altered anatomy Endoscopic retrograde cholangiopancreatography Endoscopic ultrasound Stents Intervention

Using Magnetic Nanoparticles to Eliminate Oscillations in Saccharomyces cerevisiae Fermentation Processes

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 Sustainable Bioenergy Systems 2012年第3期2卷 27-32页

作者： Lakshmi N. sridhar Chemical Engineering Department University of Puerto Rico Mayaguez

This article provides computational evidence to show that functionalized magnetic nanoparticles can eliminate the wasteful oscillatory behavior in fermentation processes involving Saccharomyces cerevisiae. There has been a consi-derable amount of work demonstrating the existence of oscillations in fermentation processes. Recently Reference [1] computationally demonstrated very simple strategies to eliminate the oscillations in the fermentation process. In the case of the of the Saccharomyces cerevisiae fermentation process it was shown that the addition of a little bit of oxygen would be successful in eliminating the oscillation causing Hopf bifurcations. The work of [2,3] demonstrated that oxygen mass transfer could be enhanced by using functionalized magnetic nanoparticles. The aim of this work is to incorporate the model used by [3] regarding the enhancement of oxygen mass transfer in the cybernetic Jones kompala model [4] describing the dynamics of the Saccharomnyces cerevisiae fermentation process and demonstrate that using the functionalized magnetic nanoparticles can by altering the mass transfer coefficient actually succeed in eliminating the oscillatory behavior that plagues the Saccharomyces cerevisiae fermentation process. This occurs because the oscillation causing Hopf bifurcations are sensitive to the amount of input oxygen and increasing the oxygen mass transfer coefficient causes the disappearance of the Hopf bifurcation points.

关键词： Nanoparticles Fermentation Oscillations

Photoreduction and Thermal Properties of Graphene-Based Flexible Films

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Graphene 2017年第2期6卷 27-40页

作者： Gautam Naik.sridhar krishnaswamy Northwestern University Department of Mechanical Engineering Evanston Illinois USA

In the present study, we report on an efficient method for large-area photoreduction of graphene oxide flexible films. The laser-based reduction can be carried out in situ and can be tuned to attain the properties required. A systematic study has been conducted to evaluate the variation of the degree of reduction with the actual reduction temperature, which is measured using an infrared thermal camera. Local reduction temperature is varied up to 350°C, and the degree of reduction is measured using the C/O ratio. The C/O ratio is increased from 2:1 for graphene oxide to 10:1 for reduced graphene oxide. This high degree of reduction is observed at low temperatures, and also in a short period of time. Thermal conductivity properties calculated using the temperature distribution shows the in-plane thermal conductivities of graphene oxide and reduced graphene oxide are a few orders of magnitude lower than single layer graphene. This can be attributed to oxygen-defect scattering, and also due to the heat conduction through the thickness of the sample by way of contact between adjacent flakes. This photoreduction method provides a way for roll-to-roll scalable production of graphene-based flexible films.

关键词： Graphene Graphene Oxide Photoreduction Laser

State-of-Charge Estimation of Lithium-Ion Battery for Electric Vehicles Using Deep Neural Network

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第12期73卷 6289-6306页

作者： M.Premkumar R.Sowmya S.sridhar C.kumar Mohamed Abbas Malak S.Alqahtani kottakkaran Sooppy Nisar Department of Electrical and Electronics Engineering Dayananda Sagar College of EngineeringBengaluru560078KarnatakaIndia Department of Electrical and Electronics Engineering National Institute of TechnologyTiruchirapalli620015Tamil NaduIndia Department of Electrical and Electronics Engineering M S Ramaiah Institute of TechnologyBengaluru560054KarnatakaIndia Department of Electrical and Electronics Engineering M.Kumarasamy College of EngineeringKarur639113Tamil NaduIndia Electrical Engineering Department College of EngineeringKing Khalid UniversityAbha61421Saudi Arabia Computers and Communications Department College of EngineeringDelta University for Science and TechnologyGamasa35712Egypt Faculty of Technology The GatewayDe Montfort UniversityLeicesterLE19BHUnited Kingdom Department of Mathematics College of Arts and SciencesPrince Sattam bin Abdulaziz UniversityWadi Aldawaser11991Saudi Arabia

It is critical to have precise data about Lithium-ion batteries,such as the State-of-Charge(SoC),to maintain a safe and consistent functioning of battery packs in energy storage systems of electric *** strategies for estimating battery SoC,such as by including the coulomb counting and kalman filter,have been *** a result of the differences in parameter values between each cell,when these methods are applied to highcapacity battery packs,it has difficulties sustaining the prediction accuracy of overall *** a result of aging,the variation in the parameters of each cell is higher as more time is spent in *** is suggested in this study to establish an SoC estimate model for a Lithium-ion battery by employing an enhanced Deep Neural Network(DNN)*** is because the proposed DNN has a substantial hidden layer,which can accurately predict the SoC of an unknown driving cycle during training,making it ideal for SoC *** evaluate the nonlinearities between voltage and current at various SoCs and temperatures,the proposed DNN is *** current and voltage data measured at various temperatures throughout discharge/charge cycles is necessary for training and testing *** the method has been thoroughly trained with the data collected,it is used for additional cells cycle tests to predict their *** simulation has been conducted for two different Li-ion battery *** to the experimental data,the suggested DNN-based SoC estimate approach produces a low mean absolute error and root-mean-square-error values,say less than 5%errors.

关键词： Artificial intelligence deep neural network Li-ion battery parameter variation SoC estimation

A sulfonate-based Cu(Ⅰ) metal-organic framework as a highly efficient and reusable catalyst for the synthesis of propargylamines under solvent-free conditions

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 Chemical Letters 2015年第1期26卷 6-10页

作者： Peng Li sridhar Regati Hui-Cai Huang Hadi D.Arman Bang-Lin Chen John C.-G.Zhao Department of Chemistry University of Texas at San AntonioOne UTSA CircleSan AntonioTX 78249-0698United States

A new highly efficient and reusable Cu（I）-MOF has been developed for the synthesis of propargylamine compounds via the three-component reaction of secondary amines, alkynes, and aromatic aldehydes under solvent-free conditions. The desired propargylamines were obtained in good to excellent yields with a low catalyst loading. The catalyst may be recovered and reused for up to 5 cycles without major loss of activity. This protocol has the advantages of excellent yields, low catalyst loading, and catalyst recyclability.

关键词： Metal-organic framework Heterogeneous catalysis Propargylamine Solvent-free

Mechanical, thermal and fire nanoclay/vinylester retardation behaviours of nanocomposites

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2011年第4期5卷 401-411页

作者： k. R. VISHNU MAHESH H. N. NARASIMHA MURTHY B. E. kUMARA SWAMY S. C. SHARMA R. sridhar Niranjan PATTAR M. kRISHNA B. S. SHERIGARA Department of P. G. Studies and Research in Industrial Chemistry Kuvempu University Shankaraghatta Shimoga 577451 Karnataka India Department of Mechanical Engineering R. V. College of Engineering Bangalore 560059 Karnataka India Tumkur University Tumkur 572103 Karnataka India

The dispersion of montmorillonite （MMT） in vinylester for preparing nanoclay/vinylester gel coat was reported. Two sets of MMT/vinylester specimens, namely Type I and Type 2, were prepared for comparative studies. Type I specimens were prepared using ultrasonication only, and Type 2 specimens were prepared using both ultrasonication and twin-screw extrusion. According to XRD and TEM results, Type 2 specimens showed lower levels of nanoclay agglomeration and higher levels o! exfoliation. DSC results showed that the glass transition temperatures of Type 2 specimens are higher than those of Type 1 specimens. TGA results showed that the residual weight of 4 wt.% MMT/vinylester of Type 1 was 7.38%, while the corresponding value of Type 2 was 13,5%, indicating lower thermal degradation in the latter. MMTt vinylester/glass and MMT/vinylester/carbon specimens were fabricated and tested for mechanical and fire retardation behaviours. Type 2 based nanocomposite laminates showed greater values of ultimate tensile strength, flexural strength, interlaminar shear strength, impact strength, horizontal burning rate, and vertical burning rate than Type 1 based laminates. SEM images of tensile fractured surfaces revealed that Type 2 based laminates have no or less agglomeration of nanoclay than Type 1 based laminates.

关键词： twin-screw extrusion montmorillonite nanoclay nanocomposite vinylester

Three co-located resistance genes confer resistance to leaf rust and stripe rust in wheat variety Borlaug 100

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Crop Journal 2022年第2期10卷 490-497页

作者： Bowei Ye Ravi P.Singh Chan Yuan Demei Liu Mandeep S.Randhawa Julio Huerta-Espino sridhar Bhavani Evans Lagudah Caixia Lan College of Plant Science&Technology Huazhong Agricultural UniversityWuhan 430070HubeiChina International Maize and Wheat Improvement Center(CIMMYT) Apdo.Postal 6-64106600 Mexico D.F.Mexico Qinghai Provincial key Laboratory of Crop Molecular Breeding Northwest Institute of Plateau BiologyChinese Academy of ScienceXining 810008QinghaiChina Campo Experimental Valle de México INIFAP Apdo.Postal 1056230ChapingoEdo.de MexicoMexico CSIRO Agriculture&Food GPO Box 1600CanberraACT 2601Australia

Leaf rust(LR) and stripe rust(YR) are important diseases in wheat producing areas worldwide and cause severe yield losses under favorable environmental conditions when susceptible varieties are grown. We determined the genetic basis of resistance to LR and YR in variety Borlaug 100 by developing and phenotyping a population of 198 F6 recombinant inbred lines derived from a cross with the susceptible parent Apav#1. LR and YR phenotyping were conducted for 4 and 3 seasons, respectively, at CIMMYT research stations in Mexico under artificial epidemics. Mendelian segregation analyses indicated that 3–5 LR and 2 YR genes conferred resistance in Borlaug 100. Lr46/Yr29(1 BL), Yr17(2 AS) and Yr30(3 BS) were present in the resistant parent and segregated in the RIL population based on characterization by molecular markers linked to these genes. When present alone, Lr46/Yr29 caused average 13% and 16% reductions in LR and YR severities, respectively, in RILs. Similarly, Yr17 and Yr30 reduced YR severities by 57% and 11%, respectively. The Yr30 and the Yr17 translocation were also associated with 27% and 14% reductions, respectively, in LR severity, indicating that the 3 BS and 2 AS chromosomal regions likely carry new slow rusting LR resistance genes, temporarily designated as Lr B1 and Lr B2, respectively. Additive effects of Yr30*Yr17, Yr29*Yr17 and Yr29*Yr30 on YR and LR were significant and reduced YR severities by 56%,55%, and 45%, respectively, and LR severities by 34%, 40%, and 45%, respectively. Furthermore, interaction between the three genes was also significant, with mean reductions of 70% for YR and 54% for LR severities. Borlaug 100, or any one of the 21 lines with variable agronomic traits but carrying all three colocated resistance loci, can be used as resistance sources in wheat breeding programs.

关键词： Co-located resistance loci Common wheat Gene interaction Puccinia triticina Puccinia striiformis Triticum aestivum

Direct laser writing spiral Sagnac waveguide for ultrahigh magnetic field sensing

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2021年第10期9卷 1984-1991页

作者： Dengwei Zhang Zhihang Zhang Heming Wei Jianrong Qiu sridhar krishnaswamy State key Laboratory of Modern Optical Instrumentation Zhejiang UniversityHangzhou 310027China key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai UniversityShanghai 200444China Center for Smart Structures&Materials Department of Mechanical EngineeringNorthwestern UniversityEvanstonIllinois 60208USA

A high-birefringence spiral Sagnac waveguide(SSW)device fabricated via direct laser writing(DLW)using a two-photon polymerization(2PP)technique is proposed,designed,and experimentally demonstrated as an ultrahigh magnetic field *** sensor comprises a Y-style tapered waveguide and an SSW containing two microfluidic *** SSW has a total length of∼2.4 mm and a spiral radius of∼200μ*** to the asymmetric structure,the SSW has a high birefringence of 0.016,which can be designed as a magnetic field sensor,as a magnetic fluid can be filled into the microfluidic channel changing the guiding mode and the birefringence and consequently leading to a change in phase of the interferometer when the applied magnetic field *** experimental results show that the proposed photonic device has a sensitivity to magnetic fields as high as 0.48 nm/Oe within a range from 10 to 100 *** proposed device is very stable and easy to fabricate,and it can therefore be used for weak magnetic field detection.

关键词： waveguide laser interferometer

Understanding the physiological functions of the host xenobiotic-sensing nuclear receptors PXR and CAR on the gut microbiome using genetically modified mice

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2022年第2期12卷 801-820页

作者： Mallory Little Moumita Dutta Hao Li Adam Matson Xiaojian Shi Gabby Mascarinas Bruk Molla kris Weigel Haiwei Gu sridhar Mani Julia Yue Cui Department of Environmental and Occupational Health Sciences University of WashingtonSeattleWA 98105USA Department of Medicine Molecular Pharmacology and GeneticsAlbert Einstein College of MedicineBronxNY 10461USA University of Connecticut HartfordCT 06106USA Arizona Metabolomics Laboratory College of Health SolutionsArizona State UniversityPhoenixAZ 85004USA

Pharmacological activation of the xenobiotic-sensing nuclear receptors pregnane X receptor(PXR) and constitutive androstane receptor(CAR) is well-known to increase drug metabolism and reduce inflammation. Little is known regarding their physiological functions on the gut microbiome. In this study, we discovered bivalent hormetic functions of PXR/CAR modulating the richness of the gut microbiome using genetically engineered mice. The absence of PXR or CAR increased microbial richness, and absence of both receptors synergistically increased microbial richness. PXR and CAR deficiency increased the pro-inflammatory bacteria Helicobacteraceae and Helicobacter. Deficiency in both PXR and CAR increased the relative abundance of Lactobacillus, which has bile salt hydrolase activity, corresponding to decreased primary taurine-conjugated bile acids(BAs) in feces, which may lead to higher internal burden of taurine and unconjugated BAs, both of which are linked to inflammation, oxidative stress, and cytotoxicity. The basal effect of PXR/CAR on the gut microbiome was distinct from pharmacological and toxicological activation of these receptors. Common PXR/CAR-targeted bacteria were identified, the majority of which were suppressed by these receptors. h PXR-TG mice had a distinct microbial profile as compared to wild-type mice. This study is the first to unveil the basal functions of PXR and CAR on the gut microbiome.

关键词： PXR CAR Gut microbiome Bile acids Inflammation Mice Nuclear receptor Feces

Impact of Channel Dynamics, Combined Nonlinearities and ASE Noise on Transmission Performance of all Optical Star WDM Networks

在线全文

学校读者我要写书评

暂无评论

Communications and Network 2011年第4期3卷 235-249页

作者： sridhar Iyer Shree Prakash Singh 不详

For all optical Wavelength Division Multiplexing (WDM) network based on G.653 fibers, we investigate the quality factor deterioration due to combined nonlinear effects and Amplified spontaneous emission (ASE) noise for system parameters based on ITU-T Recommendation G.692. The investigation: (a) emphasizes on stimulated Raman scattering (SRS) and four wave mixing (FWM) effects which are the dominant nonlinearities known to limit WDM system performance and (b) accounts for beating between nonlinearities and beating between ASE noise and nonlinearities. Using the proposed model, performance of the worst affected channels due to SRS and FWM is compared and the results indicate that the worst affected channel due to SRS performs better and hence must be preferred for reliable and efficient transmission over the worst affected channel due to FWM. Further, the results suggest that to achieve a desired error rate (quality factor);there exists an optimal value of channel spacing for a given number of channels. The proposed theoretical model is also validated through extensive simulations over Rsoft OptSimTM simulator and the two sets of results are found to match, indicating that the proposed model accurately calculates the quality factor of the all optical WDM network.

关键词： Amplified Spontaneous Emission (ASE) Noise Four Wave Mixing (FWM) Optical Star Network Stimulated Raman Scattering (SRS) Wavelength Division Multiplexing (WDM)