检索结果-南通市图书馆

Dolochar as a reductant in the reduction roasting of iron ore slimes

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12期24卷 1341-1351页

作者： swagat s. rath Danda srinivas rao Institute of Minerals and Materials Technology Council of Scientific&Industrial ResearchBhubaneswar 751013India

The present investigation examines the viability of dolochar, a sponge iron industry waste material, as a reductant in the reduction roasting of iron ore slimes, which are another waste generated by iron ore beneficiation plants. Under statistically determined optimum conditions, which include a temperature of 900°C, a reductant-to-feed mass ratio of 0.35, and a reduction time of 30–45 min, the roasted mass, after being subjected to low-intensity magnetic separation, yielded an iron ore concentrate of approximately 64 wt% Fe at a mass recovery of approximately 71% from the feed iron ore slime assaying 56.2 wt% Fe. X-ray diffraction analyses indicated that the magnetic products contain magnetite and hematite as the major phases, whereas the nonmagnetic fractions contain quartz and hematite.

关键词： iron ore slime reduction roasting dolochar reductant magnetic separation

The relationship between sexual selection and speciation

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2012年第3期58卷 413-415页

作者： Maria r. sErVEDIO Department of Biology University of North Carolina Chapel Hill NC 27599 USA servedio@email.unc.edu

1 Introduction The intriguing relationship between sexual selection and speciation has sparked an increasing number of pa- pers in recent years that have attempted to draw connec- tions between the two processes. These include a myriad of theoretical and empirical studies, as well as several influential reviews （e.g. Price, 1998; Panhuis et al., 2001, Kirkpatrick and ravign6, 2002; ritchie, 2007; Maan and seehausen, 2011）. In particular, many re- searchers have speculated on whether sexual selection can lead to speciation, either alone, or in conjunction with ecological processes. such speculation is tempting in part because of the obvious differences in secondary sexual characters that often exist between closely re- lated species. Indeed one of the earliest and most influ- ential of all sexual selection models, Lande＇s （1981） paper ＂Models of speciation by sexual selection on a polygenic trait＂ centered its title on the role that sexual selection may play in speciation.

关键词：形态选择模型生态过程第二性征基因性状新物种影响性

Projected rainfall Intensity Duration Frequency relationships under Climate Change:A Case study Thane City

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 & Earth sciences 2022年第2期4卷 54-64页

作者： s.s.Pujari A.s.Wayal Veermata Jijabai Technological Institute Civil and Environmental Engineering DepartmentMumbaiMaharashtra400019India

Climate change is the most important factor to increase in short-duration high-intensity rainfall and consequent ***-Duration-Frequency(IDF)curves are commonly used tools in stormwater design,so a method to derive future IDF curves including climate change effect could be necessary for the mainstreaming climate change information into storm water *** objective of the present study is to define a mechanism to reflect the effect of climate change into the projected rainfall IDF *** this,the continuously observed hourly rainfall data from 1969 to 2018 were divided into five *** the IDF curve of each subgroup is *** rainfall intensity for the next 30 years was then estimated using a linear regression *** obtained result indicates that for the same duration and for the same return period,the rainfall intensity is likely to increase over time:17%(2019-2028),25%(2029-2038)and 32%(2039-2048).However,the findings presented in this paper will be useful for local authorities and decision makers in terms of improving stormwater design and future flood damage will be avoided.

关键词： Climate change rainfall analysis Projected IDF relationships IDF curves Thane city

Increased syndecan-1 and glypican-3 predict poor perinatal outcome and treatment resistance in intrahepatic cholestasis

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

Hepatobiliary & Pancreatic Diseases International 2020年第3期19卷 271-276页

作者： Basak Gümüs Güler sibel Ozler Department of Health sciences Istinye UniversityIstanbul 34010Turkey Department of Perinatology Selcuk University Faculty of MedicineKonya 42130Turkey

Background:Intrahepatic cholestasis of pregnancy(ICP)increases the risk of adverse pregnancy *** study aimed to explore the association between serum syndecan-1 and glypican-3 levels and the adverse perinatal outcome as well as the responses to the treatment of ursodeoxycholic acid(UDCA).Methods:This prospective,case control study included 88 pregnant women(44 women with ICP and 44 healthy controls).The primary end points were the perinatal outcome and the response to UDCA therapy.A logistic regression model was used to identify the independent risk factors of adverse pregnancy outcomes and reduced response to UDCA ***:Women with ICP had significantly higher serum syndecan-1(1.27±0.36 ng/m L vs.0.98±0.50 ng/m L;P=0.003),glypican-3(1.78±0.13 ng/m L vs.1.69±0.16 ng/m L;P=0.004),AsT(128.59±1.44 vs.13.29±1.32 U/L;Ps.8.00±3.67 U/L;Ps compared with the *** increased levels of syndecan-1(Or=4.715,95%CI:1.554–14.310;P=0.006),glypican-3(Or=8.465,95%CI:3.372–21.248;P=0.007),ALT(Or=1.382,95%CI:1.131–1.690;P=0.002),and postprandial bile acid(PBA)(Or=3.392,95%CI:1.003–12.869;P=0.026)were correlated to *** adverse neonatal outcome was related to increased glypican-3(Or=4.275,95%CI:2.726–5.635;P=0.039),and PBA(Or=3.026,95%CI:1.069–13.569;P=0.037).Increases of syndecan-1(Or=7.464,95%CI:2.130–26.153,P=0.017)and glypican-3(Or=6.194,95%CI:2.951–13.002;P=0.025)were the risk factors of decreased response to UDCA ***:syndecan-1 and glypican-3 might be powerful determinants in predicting adverse perinatal outcome in patients with ICP,and they can be used to predict the response to the UDCA treatment.

关键词： Intrahepatic cholestasis of pregnancy syndecan-1 Glypican-3 Adverse perinatal outcome response to UDCA

An Ontology Based Multilayer Perceptron for Object Detection

在线全文

学校读者我要写书评

暂无评论

Computer systems science & Engineering 2023年第3期44卷 2065-2080页

作者： P.D.sheena smart K.K.Thanammal s.s.sujatha Department of Computer science S.T.Hindu CollegeNagercoilAffiliated to Manonmaniam Sundaranar UniversityAbishekapattiTirunelveli627012TamilnaduIndia Department of Computer science and Applications S.T.Hindu CollegeNagercoil629002India

In object detection,spatial knowledge assisted systems are *** detection is a main and challenging issue to analyze object-related *** existing object detection techniques were developed to consider the object detection problem as a classification problem to perform feature selection and *** these techniques still face,less computational efficiency and high time *** paper resolves the above limitations using the Fuzzy Tversky index Ontology-based Multi-Layer Perception method which improves the accuracy of object detection with minimum *** proposed method uses a multilayer forfinding the similarity score.A fuzzy membership function is used to validate the score for predicting the burned and non-burned *** assessment is performed with different factors such as classification rate,time complexity,error rate,space complexity,and precision by using the forestfire *** results show that this novel technique can help to improve the classification rate and reduce the time and space complexity as well as error rate than the conventional methods.

关键词： Object detection similarity score ontology deep learning fuzzy function perception

Thermal-hydraulic performance analysis of a subchannel with square and triangle fuel rod arrangements using the entropy generation approach

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

Nuclear science and Techniques 2017年第10期28卷 95-101页

作者： s.Talebi M.M.Valoujerdi Department of Energy Engineering and Physics AmirkabirUniversity of Technology424 Hafez AvenueP.O.Box 15875-4413TehranIran

The present paper discusses entropy generation in fully developed turbulent flows through a subchannel,arranged in square and triangle arrays. Entropy generation is due to contribution of both heat transfer and pressure drop. Our main objective is to study the effect of key parameters such as spacer grid, fuel rod power distribution,reynolds number re, dimensionless heat power ω, lengthto-fuel-diameter ratio λ, and pitch-to-diameter ratio ξ on subchannel entropy generation. The analysis explicitly shows the contribution of heat transfer and pressure drop to the total entropy generation. An analytical formulation is introduced to total entropy generation for situations with uniform and sinusoidal rod power distribution. It is concluded that power distribution affects entropy generation.A smoother power profile leads to less entropy *** entropy generation of square rod array bundles is more efficient than that of triangular rod arrays, and spacer grids generate more entropy.

关键词：熵产生子信道燃料棒三角形正方形性能分析热工水力生成方法

Template-free Fabrication and Luminescent Characterization of Highly Uniform and Monodisperse Y_2O_2s:sm^(3+) Hollow submicrospheres

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & Technology 2012年第7期28卷 666-672页

作者： s.Q. Deng Z.P. Xue Y.H. Yang Q. Yang Y.L. Liu Department of Chemistry Jinan University Guangzhou 510632 China

Well dispersed and homogeneous Y2O2s：sm3＋ hollow submicrospheres were successfully achieved by a template- free solvothermal method combining with a postcalcining process. The crystalstructure and particle morphology were investigated by the X-ray diffraction （XrD）, Fourier transform infrared （FT-Ir） spectra, scanning and transmission electron microscopy （sEM and TEM）, respectively. A possible growth mechanism was proposed to reveal the formation process. Luminescence properties of the Y202s：sm3＋ long-lasting phosphor were an- alyzed by measuring the excitation spectra, emission spectra, afterglow decay curve and thermoluminescence curve. The excitation spectra indicated that the phosphor could be excited effectively by the ultraviolet-light emitting diode （UV-LED） or blue LED, and the emission spectra showed that the phosphor could emit red light from 600 to 650 nm.

关键词： Yttrium oxysulfide Hollow submicrosphere Luminescence Long-lasting phosphor

Improved strength and ductility of high alloy containing Al–12Zn–3Mg–2.5Cu alloy by combining non-isothermal step rolling and cold rolling

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2期24卷 179-185页

作者： V.V.ravikumar s.Kumaran Department of Metallurgical and Materials Engineering National Institute of TechnologyTamil Nadu 620015India

Al-12Zn-3Mg-2.5Cu alloy was prepared using a liquid metallurgy route under the optimized conditions. A sample cut from the ingot was rolled non-isothermally from 400℃ to 100℃ in 100℃ steps, with 15% reduction in thickness; it was then cold rolled isothermally at room temperature for 85% reduction. The cold-rolled alloys were characterized by electron microscopy, hardness test, and tensile test to elucidate their structural evolution and evaluate their mechanical behavior. In the results, the cast alloy consists of a-aluminum and various intermetallic compounds. These compounds are segregated along the grain boundaries, which makes the alloy difficult to roll at room tem- perature. The combined effect of non-isothermal step rolling and cold rolling results in the nano/microsized compounds distributed uniformly in the matrix. The hardness is substantially increased after rolling. This increase in hardness is attributed to the ultra-fine grain size, fine-scale intermetallic compounds, and structural defects （e.g., dislocations, stacking faults, and sub-grains）. The ultimate tensile strength of the rolled alloy is approximately 628 MPa with 7% ductility.

关键词： aluminum zinc magnesium copper alloys non-isothermal cold rolling mechanical properties intermetallic compounds struc-ture defects

Considering calcium-binding proteins in invertebrates: multi-functional proteins that shape neuronal growth

在线全文

学校读者我要写书评

暂无评论

Neural regeneration research 2016年第2期11卷 208-209页

作者： Charles r.Tessier Department of Medical and Molecular Genetics Indiana University School of Medicine-South Bend

Calcium is a critical second messenger molecule in all cells and is vital in neurons for synaptic *** this importance,calcium ions are tightly controlled by a host of molecular players including ion channels,sensors,and buffering *** can act directly by binding to signaling molecules or calcium’s effects can be indirect,for example by altering nuclear histones.

关键词： Considering calcium-binding proteins in invertebrates multi-functional proteins that shape neuronal growth