检索结果-南通市图书馆

Journal of Earth science 2013年第3期24卷 428-436页

作者： Anju Pandey ravi mishra Centre for Climate Change research National Centre for Antarctic & Ocean research

High-precision, clay sediment oxygen and hydrogen isotopes analyses of Pleistocene-Holocene deep-sea sediments from the Bay of Bengal （BOB） are presented for the first time. Our study shows that the major source of sediments in the study area, since the last-25 000 years, is likely to be the Higher Himalayan crystalline rocks. Further, the study of these stable isotope data displays the variation of southwest monsoon （sWM） in the BOB region since the last-25 000 years and the cause behind the variation has been interpreted. The δ 18 O values of the clay sediments are compared with δ 18 O values of the BOB seawater. This comparison shows that the clay sediment δ 18 O values of the studied sediment cores temporally vary along with the changes in strength of the sWM. Based on the changes in the clay sediment δ 18 O values of the studied sediment, we evaluate the variance in the sWM since the last 25 000 years in the BOB. Our results are consistent with previous work in the region based on other proxies. To evaluate the factors influencing the intensity of the sWM since the last glacial maxima, we conducted comparative analyses of the studied clay sediment δ 18 O values with δ 18 O values in the Greenland ice cores （GIsP2） and Tibetan ice cores （Guliya）. The results from this comparative study show that large-scale changes in the intensity of the sWM since 25 000 years are affected by the climate oscillations of the Northern Hemisphere, but rapid and abrupt fluctuations in the sWM seem to be controlled by the amount of snow cover in the Tibetan Plateau.

关键词： southwest monsoon Bay of Bengal Tibetan Plateau clay stable isotope.

A model for expansion ratio in liquid-solid fluidized beds

在线全文

学校读者我要写书评

暂无评论

Particuology 2013年第6期11卷 789-792页

作者： Alok Tripathy A.K.sahu s.K.Biswal B.K.mishra Council of scientific and Industrial research Institute of Minerals and Materials Technology

Liquid-solid fluidized beds are used in mineral processing industries to separate particles based on parti- cle size, density, and shape. Understanding the expanded fluidized bed is vital for accurately assessing its performance. Expansion characteristics of the fluidized bed were studied by performing several experi- ments with iron ore, chromite, quartz, and coal samples. Using water as liquid medium, experiments were conducted to study the effects of particle size, particle density, and superficial velocity on fluidized bed expansion. The experimental data were utilized to develop an empirical mathematical model based on dimensional analysis to estimate the expansion ratio of the fluidized bed in terms of particle character- istics, operating and design parameters. The predicted expansion ratio obtained from the mathematical model is in good agreement with the experimental data.

关键词： Fluidization Bed expansion Mathematical modelling Dimensional analysis Particle processing Void fraction

semantic segmentation of Lumbar Vertebrae Using Meijering U-Net(MU-Net)on spine Magnetic resonance Images

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & sciences 2025年第1期142卷 733-757页

作者： Lakshmi s V V shiloah Elizabeth Darmanayagam sunil retmin raj Cyril Department of Computer science and Engineering College of Engineering GuindyAnna UniversityChennai600025India Department of Information Technology Madras Institute of TechnologyAnna UniversityChrompetChennai600044India

Lower back pain is one of the most common medical problems in the world and it is experienced by a huge percentage of people *** to its ability to produce a detailed view of the soft tissues,including the spinal cord,nerves,intervertebral discs,and vertebrae,Magnetic resonance Imaging is thought to be the most effective method for imaging the *** semantic segmentation of vertebrae plays a major role in the diagnostic process of lumbar *** is difficult to semantically partition the vertebrae in Magnetic resonance Images from the surrounding variety of tissues,including muscles,ligaments,and intervertebral discs.U-Net is a powerful deep-learning architecture to handle the challenges of medical image analysis tasks and achieves high segmentation *** work proposes a modified U-Net architecture namely MU-Net,consisting of the Meijering convolutional layer that incorporates the Meijering filter to perform the semantic segmentation of lumbar vertebrae L1 to L5 and sacral vertebra ***-colour mask images were generated and used as ground truth for training the *** work has been carried out on 1312 images expanded from T1-weighted mid-sagittal MrI images of 515 patients in the Lumbar spine MrI Dataset publicly available from Mendeley *** proposed MU-Net model for the semantic segmentation of the lumbar vertebrae gives better performance with 98.79%of pixel accuracy(PA),98.66%of dice similarity coefficient(DsC),97.36%of Jaccard coefficient,and 92.55%mean Intersection over Union(mean IoU)metrics using the mentioned dataset.

关键词： Computer aided diagnosis(CAD) magnetic resonance imaging(MrI) semantic segmentation lumbar vertebrae deep learning U-Net model

Biochemical changes associated with flowering in Bambusa arundinacea and Bambusa nutans

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 Forestry research 2018年第5期29卷 1315-1320页

作者： Pramod Kumar Yogeshwar mishra Tropical Forest research Institute Jabalpur Madhya Pradesh 482021 India

Biochemical changes associated with flowering in Bambusa arundinacea Linn and Bambusa nutans *** Munro were *** flowering was initiated in natural areas and plantations of *** in late 2014 and reached full bloom in early 2015,whereas sporadic flowering recorded during 2014–2015 in vegetatively propagated plants of *** and nodal shoot samples from flowering culms/shoots and nonflowering culms/shoots were collected in February 2015 at the initiation of fruit filling,then analyzed and compared for soluble sugars,phenols and peroxidase *** both species sugars were higher in leaves of flowering culms/shoots and lower in nodal shoots of flowering culms/shoots compared to the *** were lower in leaves and nodal shoots of flowering ***,but higher in leaves and decreases in nodal shoots of *** activity increases in leaves and nodal shoots of *** after flowering but increases in nodal shoots and decreases in leaves of ***.

关键词： sugars Phenols Peroxidase activity Flowering Bambusa arundinacea Bambusa nutans

Nitrogen uptake by phytoplankton in surface waters of the Indian sector of southern Ocean during austral summer

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth science 2018年第1期12卷 52-62页

作者： s. C. TrIPATHY sIVAJI PATrA K. VIsHNU VArDHAN A. sArKAr r. K. mishra N. ANILKUMAr EssO-National Centre for Antarctic and Ocean research Ministry of Earth Sciences Headland Sada Vasco-da-Gama Goa 403804 India EssO-Integrated Coastal and Marine Area Management-PD Ministry of Earth Sciences NIOT Campus Velachery Pallikaranai Chennai 600100 India

This study reports the nitrogen uptake rate （using 15N tracer） of phytoplankton in surface waters of different frontal zones in the Indian sector of the southern Ocean （sO） during austral summer of 2013. The investigated area encompasses four major frontal systems, i.e., the subtropical front （sTF）, subantarctic front （sAF）, polar front-1 （PF1） and polar front-2 （PF2）. southward decrease of surface water temperature was observed, whereas surface salinity did not show any significant trend. Nutrient （NO3- and siO44-） concentrations increased southward from sTF to PF; while ammonium （NH4＋）, nitrite （NO2-） and phosphate （PO433 remained compara- tively stable. Analysis of nutrient ratios indicated potential N-limited conditions at the sTF and sAF but no such scenario was observed for PF. In terms of phytoplankton biomass, PF1 was found to be the most productive followed by sAF, whereas PF2 was the least productive region. Nitrate uptake rate increased with increasing latitude, as no systematic spatial variation was discerned for NH4＋ and urea （CO（NH2）2）. Linear relationship between nitrate and total N-uptake reveals that the studied area is capable of exporting up to 60% of the total production to the deep ocean if the environmental settings are favorable. Like N-uptake rates the f-ratio also increased towards PF region indicating comparatively higher new production in the PF than in the subtropics. The moderately high averagefiratio （0.53） indicates potentially near equal contributions by new production and regenerated production to the total productivity in the study area. Elevation in N-uptake rates with declining temperature suggests that the sO with its vast quantity of cool water could play an important role in drawing down the atmospheric CO2 through the ＂solubility pump＂.

关键词： nitrogen uptake f-ratio new productivity,frontal zones southern Ocean

Adomian decomposition method simulation of von Kármán swrling bioconvection nanofluid flow

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 Central south University 2019年第10期26卷 2797-2813页

作者： M D sHAMsHUDDIN s r mishra O ANWAr BEG A KADIr Department of Mathematics Vaagdevi College of EngineeringWarangalTelanganaIndia Department of Mathematics Siksha'O’Anusandhan Deemed to be UniversityKhandagiriBhubaneswarOdishaIndia Department of Aeronautical and Mechanical Engineering University of SalfordManchesterEnglandUK

The study reveals analytically on the 3-dimensional viscous time-dependent gyrotactic bioconvection in swirling nanofluid flow past from a rotating *** is known that the deformation of the disk is along the radial *** addition to that stefan blowing is *** Buongiorno nanofluid model is taken care of assuming the fluid to be dilute and we find Brownian motion and thermophoresis have dominant role on nanoscale *** primitive mass conservation equation,radial,tangential and axial momentum,heat,nano-particle concentration and micro-organism density function are developed in a cylindrical polar coordinate system with appropriate wall(disk surface)and free stream boundary *** highly nonlinear,strongly coupled system of unsteady partial differential equations is normalized with the classical von Kármán and other transformations to render the boundary value problem into an ordinary differential *** emerging 11th order system features an extensive range of dimensionless flow parameters,i.e.,disk stretching rate,Brownian motion,thermophoresis,bioconvection Lewis number,unsteadiness parameter,ordinary Lewis number,Prandtl number,mass convective Biot number,Péclet number and stefan blowing *** of the system are obtained with developed semi-analytical technique,i.e.,Adomian decomposition *** of the said problem is also conducted with earlier literature computed by runge-Kutta shooting technique.

关键词： nanofluids bioconvection rotating disk bioreactors von Kármán swirling flow stefan blowing Adomian decomposition method(ADM)

Thermal Characteristics of Air-Water spray Impingement Cooling of Hot Metallic surface under Controlled Parametric Conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal science 2016年第3期25卷 266-272页

作者： santosh Kumar Nayak Purna Chandra mishra school of Mechanical Engineering KIIT University

Experimental results on the thermal characteristics of air-water spray impingement cooling of hot metallic surface are presented and discussed in this *** controlling input parameters investigated were the combined air and water pressures,plate thickness,water flow rate,nozzle height from the target surface and initial temperature of the hot *** effects of these input parameters on the important thermal characteristics such as heat transfer rate,heat transfer coefficient and wetting front movement were measured and *** flat plate samples of mild steel with dimension 120 mm in length,120 mm breadth and thickness of 4 mm,6 mm,and 8mm respectively were *** air assisted water spray was found to be an effective cooling media and method to achieve very high heat transfer rate from the *** heat transfer rate and heat transfer coefficients were obtained for the lesser i.e,4 mm thick *** in the nozzle height reduced the heat transfer efficiency of spray *** an inlet water pressure of 4 bar and air pressure of 3 bar,maximum cooling rates670℃/s and average cooling rate of 305.23℃/s were achieved for a temperature of 850℃ of the steel plate.

关键词： air-water spray transient temperature cooling rate plate thickness

Microwave Assisted Extraction,Antioxidant Potential and Chromatographic studies of some rasayana Drugs

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2015年第7期21卷 523-529页

作者： Ashish mishra shilpi mishra shilpi Bhargav Cs.Bhargava Mayank Thakur Advance Institute of Biotech&Paramedical sciences Institute for Laboratory Medicine Clinical Chemistry and Pathobiochemistry Charite University of MedicineCampus Benjamin Franklin

Objective： To study and compare the conventional extraction procedure with microwave assisted extraction （MAE） for some Ayurvedic rasayana drugs and to evaluate their antioxidant potential and carry out the characterization of extracts by thin layer chromatography. Methods： Three Ayurvedic rasayana plants Allium sativum Linn., Bombax ceiba Linn. and Inula racemosa Hook. were evaluated for an improved MAE methodology by determining the effects of grinding degree, extraction solvent, effect of dielectric constant and duration of time on the extractive value. Antioxidant potential of all three drugs was evaluated with 2,2-diphenyl-l-picrylhydrazyl （DPPH） radical scavenging activity and reducing power was determined by using Gallic acid as standard. Further thin layer chromatographic （TLC） analysis was performed on pre-activated silica Gel G plates and rf value were compared with those reported for the important biomarkers. results： The total extractive value for Allium sativum Linn. was 36.95% （w/w） and 49.95% （w/w） for ethanol extraction respectively. In case of Bombax ceiba Linn. the yield of aqueous extract by MAE was 50% （w/w） compared to 42% （w/w） in ethanol （50% v/v）. Percent yield of Inula racernosa Hook. in aqueous extract was found to be 27.55% （w/w） which was better than ethanol extract （50%） where the yield was 25.95% （w/w）. Upon antioxidant activity evaluation A. safivum extract showed an absorbance of 0.980 ± 0.92 at concentration of 500 μg with maximum reducing capacity. This was followed by B. ceiba Linn. 0.825 ± 0.98 and I. racemosa Hook. with 0.799 ± 2.01 at a concentration of 500 μ g. TLC based standardization of A. sativum Linn. extract shows single spot with rf value of 0.38, B. ceiba Linn. extract shows rf values were 0.23, 0.58, 0.77, 0.92 and I. racemosa Hook. extract spot had a rf value of 0.72. Conclusions： A significant improvement in extractive values was observed as a factor of time and other advantages by using MAE technology. All three dru

关键词： antioxidant potential Ayurvedic rasayana Allinm sativum Linn. Bombax ceiba Inula racemosa,microwave assisted extraction

Elevated basal intestinal mucosal cytokine levels in asymptomatic first-degree relatives of patients with Crohn's disease

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2000年第1期6卷 49-52页

作者： Indaram AVK Nandi s Weissman s Lam s Bailey B Blumstein M Greenberg r Bank s Division of Gastroenterology Long Island Jewish Medical CenterAlbert Einstein College of MedicineNew YorkUSA

AIM To determine levels of cytokines incolonic mucosa of asymptomatic first degreerelatives of Crohn’s disease *** Cytokines(Interleukin(IL)1-Beta,IL-2,IL-5 and IL-8)were measured using ELIsAin biopsy samples of normal looking colonicmucosa of first degree relatives of Crohn’sdisease patients(n = 9)and from normalcontrols(n = 10)with no family history ofCrohn’s *** Asymptomatic first degree relativesof patients with Crohn’s disease had significantlyhigher levels of basal intestinal mucosalcytokines(IL-2,IL-5 and IL-8)than *** these increased cytokinelevels serve as phenotypic markers for a geneticpredisposition to developing Crohns diseaselater on,or whether they indicate early(pre-clinical)damage has yet to be further *** Asymptomatic first degreerelatives of Crohn’s disease patients have higherlevels of cytokines in their normal-lookingintestinal mucosa compared to normal controls,This supports the hypothesis that increasedcytokines may be a cause or an early event inthe inflammatory cascade of Crohns disease andare not merely a result of the inflammatoryprocess.

关键词： subject headings crohns disease cytokine/analysis intestinal mucosa

Embryonic thermal manipulation:a potential strategy to mitigate heat stress in broiler chickens for sustainable poultry production

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 Animal science and Biotechnology 2024年第4期15卷 1347-1375页

作者： sadid Al Amaz Birendra mishra Department of Human Nutrition Food and Animal SciencesCollege of Tropical Agriculture and Human ResourcesUniversity of Hawaii at ManoaAgSci 2161955 East‑West RdHonoluluHI 96822USA

Due to high environmental temperatures and climate change, heat stress is a severe concern for poultry health and production, increasing the propensity for food insecurity. With climate change causing higher temperatures and erratic weather patterns in recent years, poultry are increasingly vulnerable to this environmental stressor. To mitigate heat stress, nutritional, genetic, and managerial strategies have been implemented with some success. However, these strategies did not adequately and sustainably reduce the heat stress. Therefore, it is crucial to take proactive measures to mitigate the effects of heat stress on poultry, ensuring optimal production and promoting poultry well-being. Embryonic thermal manipulation(TM) involves manipulating the embryonic environment's temperature to enhance broilers' thermotolerance and growth performance. One of the most significant benefits of this approach is its cost-effectiveness and saving time associated with traditional management practices. Given its numerous advantages, embryonic TM is a promising strategy for enhancing broiler production and profitability in the poultry industry. TM increases the standard incubation temperature in the mid or late embryonic stage to induce epigenetic thermal adaption and embryonic metabolism. Therefore, this review aims to summarize the available literature and scientific evidence of the beneficial effect of pre-hatch thermal manipulation on broiler health and performance.

关键词： Broiler Embryo Epigenetics Global warming Thermoregulation