检索结果-南通市图书馆

Using Support Vector Machines and neural networks to classify Merlot wines from South America

Information Processing in Agriculture 2019年第2期6卷 265-278页

作者： Nattane Luı´za Costa Laura Andrea Garcı´a Llobodanin Inar Alves Castro rommel barbosa Instituto de Informa´tica Universidade Federal de Goia´sGoiaˆnia-GoBrazil LADAF-Laboratory of Functional Foods Department of Food and Experimental NutritionFaculty of Pharmaceutical SciencesUniversity of Sa˜o PauloAv.Lineu Prestes580B1405508-900 Sa˜o PauloBrazil

Wines with a clear geographical origin are an issue of interest for consumers and food *** paper presents a data mining study of Merlot wines from South America to identify the fingerprint of their geographical origin.A group of samples from Argentina(n=17),Brazil(n=12),Chile(n=48),and Uruguay(n=6)was *** chemical compounds were determined by high-performance liquid chromatography(HPLC).These compounds include antioxidant activity,total polyphenols,total anthocyanins,individual anthocyanins and *** binary classification problems were performed(Brazil versus non-Brazil,Argentina versus non-Argentina,Chile versus non-Chile,and Uruguay versus non-Uruguay)to investigate the geographic characteristics of each *** the evaluation of binary classifications in our dataset it was possible to identify the main variables(chemical compounds)that discriminate between the *** used the following algorithms:Synthetic Minority over-sample Technique and under-sampling to balance the dataset of each classification approach,the Relief algorithm to obtain a variable importance ranking and the classifiers Support Vector Machines,Multilayer Perceptron and Radial Basis Function Network with dynamic decay *** model obtained the highest performance measures among the classifiers for each dataset(93.73%of accuracy for the Brazil versus non-Brazil,91.18%for the Argentina versus non-Argentina,79.16%for the Chile versus non-Chile,and 91.67%for the Uruguay versus non-Uruguay classification).These accuracies were achieved by the search of the possible variable subsets according to Relief for each classification *** found that some variables,such as DPPH,wine color and individual anthocyanins,are among the most important variables in the characterization of Merlot wines.

关键词： Support Vector Machine Multilayer Perceptron Anthocyanins Feature selection Merlot wines South America wines

来源：

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

Multielement determination in orange juice by ICP-MS associated with data mining for the classification of organic samples

引用

Information Processing in Agriculture 2017年第3期4卷 199-205页

作者： Christian Turra Marcio Dias de Lima Elisabete A.De Nadai Fernandes Marcio Arruda Bacchi Fernando barbosa Jr. rommel barbosa Centro de Energia Nuclear na Agricultura Universidade de Sao PauloPiracicabaBrazil USP-Ribeirao Preto Brazil Instituto de Informatica Universidade Federal de GoiasGoianiaGOBrazil Instituto Federal de Educacao Ciencia e Tecnologia de Goias GoianiaGOBrazil

The aim of this study was to discriminate organic from conventional orange juice based on chemical elements and data mining applications.A comprehensive sampling of organic and conventional oranges was carried out in Borborema,state of Sao Paulo,*** fruits of the variety Valencia(Citrus sinensis(L.)Osbeck)budded on Rangpur lime(Citrus limonia Osbeck)were *** chemical elements were determined in 57 orange samples grown in organic and conventional *** order to classify these samples,data mining techniques(Support Vector Machine(SVM)and Multilayer Perceptron(MLP))were combined with feature selection(F-score and chi-squared).SVM with chi-squared had a better performance compared with the other techniques because it reached 93.00% accuracy using only seven chemical components(Cu,Cs,Zn,Al,Mn,Rb and Sr),and correctly classified 96.73% of the samples grown in an organic system.

关键词： Data mining Support vector machines Multilayer perceptron Orange juice Trace elements Inductively coupled plasma mass spectrometry(ICP-MS)

来源：

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

Foreword to the special issue on wide-bandgap(WBG)semiconductors:from fundamentals to applications

引用

Nanotechnology and Precision Engineering 2020年第4期3卷 187-188页

作者： Zongwei Xu Yidan Tang Mathias rommel Tianjin University China Institute of Microelectronics of Chinese Academy of Sciences China Fraunhofer Institute for Integrated Systems and Device Technology(IISB) Germany

The development of new kinds of semiconductor material is a very attractive topic of scientific research and *** is considered as one of the most impressive 2D materials for many applications,like graphene-reinforced metal matrix nanocomposites.1 Widebandgap(WBG)semiconductors have received widespread attention in recent years because of their superior physical properties such as large band gap,high carrier mobility,and high thermal *** by silicon carbide(SiC)and gallium nitride(GaN),WBG semiconductor materials,therefore,can be operated in extreme working environments or conditions such as high temperature,high frequency,and high power.

关键词： carbide attractive extreme

来源：

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

Advances in gastric cancer research will light the way to control this cancer

引用

Chinese Journal of Cancer Research 2022年第6期34卷 575-578页

作者： Paulo Pimentel de Assumpcao rommel Rodrigues Burbano Universidade Federal do Para Nucleo de Pesquisas em OncologiaBelem-Para-Brasil 66075-110Brazil Hospital Ophir Loyola Laboratorio de Biologia MoleculaBelém-Para-Brasil 66063-240Brazil

Gastric adenocarcinoma(GC)is one of the most heterogeneous cancers,posing challenges to wide applications of the discoveries when compared to other ***,the benefits of research in the fight against GC are extraordinary,and even taking in mind the immense complexity of this disease,optimism is a great message to take *** advances in GC research will pave the way for GC effective control,helping to save lives,together with permitting sustainable real-life support for those needing complex and high-expense interventions.

关键词： Gastric cancer research innovations

来源：

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

Effects of a novel bacterial phytase expressed in Aspergillus Oryzae on digestibility of calcium and phosphorus in diets fed to weanling or growing pigs

引用

Journal of Animal Science and Biotechnology 2013年第2期4卷 102-111页

作者： Ferdinando Nielsen Almeida rommel Casilda Sulabo Hans Henrik Stein Department of Animal Sciences University of Illinois

In 2 experiments, 48 weanling （initial BW： 13.5 ± 2.4 kg, Exp. 1） were used to determine effects of a novel bacterial 6-phytase and 24 growing pigs （initial BW： 36.2 ± 4.0 kg, Exp. 2） expressed in Aspergillus oryzae on the apparent total tract digestibility （ATTD） of phosphorus and calcium in corn-soybean meal diets fed to weanling and growing pigs. In Exp. 1 and 2, pigs were randomly allotted to 6 dietary treatments using a randomized complete block design and a balanced 2 period changeover design, respectively. In both experiments, 6 diets were formulated. The positive control diet was a corn-soybean meal diet with added inorganic phosphorus （Exp. 1：0.42 and 0.86% standardized total tract digestible phosphorus and total calcium, respectively; Exp. 2：0.32 and 0.79% standardized total tract digestible phosphorus and total calcium, respectively）. A negative control diet and 4 diets with the novel phytase （Ronozyme HiPhos, DSM Nutritional Products Inc., Parsippany, N J） added to the negative control diet at levels of 500, 1,000, 2,000, and 4,000 phytase units （FYT）/kg were also formulated. In Exp. 1, the ATTD of phosphorus was greater （P 〈 0.01） for the positive control diet （60.5%） than for the negative control diet （40.5%）, but increased （linear and quadratic, P 〈 0.01） as phytase was added to the negative control diet （40.5% vs. 61.6%, 65.1%, 68.7%, and 68.0%）. The breakpoint for the ATTD of phosphorus （68.4%） was reached at a phytase inclusion level of 1,016 FYT/kg. In Exp. 2, the ATTD of phosphorus was greater （P〈 0.01） for the positive control diet （59.4%） than for the negative control diet （39.8%） and increased （linear and quadratic, P〈 0.01） as phytase was added to the negative control diet （39.8% vs. 58.1%, 65.4%, 69.1%, and 72.8%）. The breakpoint for the ATTD of phosphorus （69.1%） was reached at a phytase inclusion level of 801 FYT/kg. in conclusion, the novel bacterial 6-phytase improved the ATTD of phosphorus and calcium in both weanling and growing pigs.

关键词： Calcium Digestibility Phosphorus Phytase Pigs

来源：

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

Density functional theory calculation of the properties of carbon vacancy defects in silicon carbide

引用

Nanotechnology and Precision Engineering 2020年第4期3卷 211-217页

作者： XiuhongWang Junlei Zhao Zongwei Xu Flyura Djurabekova Mathias rommel Ying Song Fengzhou Fanga State Key Laboratory of Precision Measuring Technology&Instruments Centre of MicroNano Manufacturing TechnologyTianjin UniversityTianjin 300072China Department of Physics and Helsinki Institute of Physics University of HelsinkiP.O.Box 43FI-00014 HelsinkiFinland Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China Fraunhofer Institute for Integrated Systems and Device Technology IISB Schottkystrasse 1091058 ErlangenGermany

As a promisingmaterial for quantumtechnology,silicon carbide(SiC)has attracted great interest inmaterials *** vacancy is a dominant defect in ***,understanding the properties of this defect is critical to its application,and the atomic and electronic structures of the defects needs to be *** this study,density functional theorywas used to characterize the carbon vacancy defects in hexagonal(h)and cubic(k)lattice *** zero-phonon line energies,hyperfine tensors,and formation energies of carbon vacancies with different charge states(2−,−,0,+and 2+)in different supercells(72,128,400 and 576 atoms)were calculated using standard Perdew-Burke-Ernzerhof and Heyd-Scuseria-Ernzerhof *** show that the zero-phonon line energies of carbon vacancy defects are much lower than those of divacancy defects,indicating that the former is more likely to reach the excited state than the *** hyperfine tensors of VC+(h)and VC+(k)were *** of the calculated hyperfine tensor with the experimental results indicates the existence of carbon vacancies in SiC *** calculation of formation energy shows that the most stable carbon vacancy defects in the material are VC 2+(k),VC+(k),VC(k),VC−(k)and VC 2−(k)as the electronic chemical potential increases.

关键词： Density functional theory Silicon carbide Carbon vacancy

来源：

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

Should we have a guard against therapeutic nihilism for patients with severe traumatic brain injury?

引用

Neural Regeneration Research 2017年第11期12卷 1801-1803页

作者： Ryan Hirschi Casey rommel Gregory W.J.Hawryluk School of Medicine University of UtahSalt Lake CityUTUSA Department of Biomedical Informatics School of MedicineUniversity of UtahSalt Lake CityUTUSA Department of Neurological Surgery University of UtahClinical Neurosciences CenterSalt Lake CityUTUSA

Many clinicians would agree that a vegetative outcome is a fate worse than death after a severe traumatic brain injury （TBI）. In an effort to avoid poor outcomes of this nature, neurotrauma practitioners draw from their training and experience to make the monumental decision of when to recommend against aggressive care in severe TBI patients. Such judgements are,

关键词： guard against therapeutic evere traumatic

来源：

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

Surface-enhanced Raman scattering on nanodiamond-derived carbon onions

引用

Nanotechnology and Precision Engineering 2019年第1期2卷 35-39页

作者： Ying Song Zongwei Xu Andreas Rosenkranz Mathias rommel Changkun Shi Fengzhou Fang State Key Laboratory of Precision Measuring Technology & Instruments Centre of MicroNano Manufacturing Technology Tianjin University Department of Chemical Engineering Biotechnology and Materials Universidad de Chile Fraunhofer Institute for Integrated Systems and Device Technology (IISB)

Annealing nanodiamonds(ND) at high temperatures up to 1700 ℃ is a common method to synthesize carbon onions. The transformation from NDs to carbon onions is particularly interesting because of carbon onions' potential in the field of tribology and their application in ultra-charge/discharge devices. In this paper, a novel surface-enhanced Raman scattering technique that involves coating the sample with nanoscopic gold particles is proposed to characterize the NDs after different annealing treatments. Conventional Raman and surfaceenhanced Raman spectra were obtained, and the changes of peak parameters as the function of annealing temperature were evaluated. It was found that the widths of the D and the G peaks decreased with increasing annealing temperature, reflecting an improved order in the sp^2-hybridized carbon during the transformation from NDs to carbon onions. After annealing at 1700 ℃, the sp^2?carbon was highly ordered, indicating desirable electrical conductivity and lubricity. With increasing annealing temperature, the D peak showed a blue shift of almost30 cm^(-1), while the G peak merely shifted by 5 cm^(-1). For annealing temperatures above 1100 ℃, an increase of intensity ratio ID/IGwas observed. Compared to the uncoated area, red shifts of 0.5-2 cm^(-1) and of 5-9 cm^(-1) for the G and D peaks, respectively, were detected for the gold-coated area, which was due to the coupling of the plasmons and the phonons of the samples.

关键词： Nanodiamonds Carbon onions Surface-enhanced Raman scattering LOPC mode

来源：

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

Evaluation of the viability of nanoparticles in drilling fluids as additive for fluid loss and wellbore stability

引用

Petroleum 2023年第3期9卷 342-351页

作者： Albertus Retnanto rommel Yrac Abdullah Shaat Adhika Retnanto Laith Abughaush Maha Al Sulaiti Najla Badar Texas A&M University at Qatar Qatar Georgia Institute of Technology USA

Wellbore instability is an issue that,if left untreated,can cause wells to collapse,resulting in human,environmental,equipment,and revenue *** fluids have been used to enhance the drilling process by lubricating and cooling the drill bit,eliminating cuttings,and most importantly,by improving the stability of the well by preventing fluid ***,there has been an increase in operational demands and challenges that call for drilling fluids to be more effective,economical,sustainable,and environmentally *** shales that have infinitesimally small pores,nanoparticle additives in drilling fluids can be crucial in providing the properties that are necessary to prevent fluid loss and provide wellbore stability while meeting the operational demands of the present ***,this paper examines the use of nanoparticle additives including copper(Ⅱ)oxide(CuO),magnesium oxide(MgO),and aluminum oxide(Al_(2)O_(3))where they are tested under three conditions using the permeable plugging tester(PPT),high-temperature high-pressure(HTHP)fluid loss apparatus,and API low-temperature e low-pressure(LTLP)fluid loss apparatus under concentrations of 0.03%and 0.10%.Finally,based on the results,each nanoparticle sample(particle sizes between one and 100 nm)performed well in contributing to the aim of this *** is the most effective inhibitor across all concentrations and under the three different *** contributed to reducing the fluid loss from 37.6 mL to 18.2 and 13.2 mL,which is between 52%and 65%of fluid *** MgO,it contributed to fluid loss reduction to 23.8 mL and 15 mL,which translated to 37%e60%of fluid loss *** use of Al_(2)O_(3) nanoparticles resulted in a fluid loss reduction to 33.6 mL and 17.8 mL,reducing the fluid loss up to 11%,at HTHP and up to 53%at *** CuO and MgO,Al_(2)O_(3) was less effective under HTHP conditions when compared to LTLP ***_(2)O_(3) did not suffer as a significant diminishing

关键词： Nanoparticles Drilling fluids Additives Fluid loss High-temperature and high-pressure

来源：

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

Nutritional value of high fiber co-products from the copra,palm kernel,and rice industries in diets fed to pigs

引用

Journal of Animal Science and Biotechnology 2016年第2期7卷 125-133页

作者： Hans Henrik Stein Gloria Amparo Casas Jerubella Jerusalem Abelilla Yanhong Liu rommel Casilda Sulabo Department of Animal Science University of IllinoisUrbana 61801USA Departamento de Produccion Animal Facultad de Medicina Veterinariay deZootecniaUniversidad Nacional de ColombiaBogotaColombia. University of California Davis 95616USA. University of the Philippines Los BanosPhilippines.

High fiber co-products from the copra and palm kernel industries are by-products of the production of coconut oil and palm kernel oil. The co-products include copra meal, copra expellers, palm kernel meal, and palm kernel expellers. All 4 ingredients are very high in fiber and the energy value is relatively low when fed to pigs. The protein concentration is between 14 and 22 % and the protein has a low biological value and a very high Arg：Lys ratio. Digestibility of most amino acids is less than in soybean meal but close to that in corn. However, the digestibility of Lys is sometimes low due to Maillard reactions that are initiated due to overheating during *** and palm kernel ingredients contain 0.5 to 0.6 % P. Most of the P in palm kernel meal and palm kernel expellers is bound to phytate, but in copra products less than one third of the P is bound to phytate. The digestibility of P is, therefore, greater in copra meal and copra expellers than in palm kernel ingredients. Inclusion of copra meal should be less than 15 % in diets fed to weanling pigs and less than 25 % in diets for growing-finishing pigs. Palm kernel meal may be included by 15 % in diets for weanling pigs and 25 % in diets for growing and finishing *** bran contains the pericarp and aleurone layers of brown rice that is removed before polished rice is *** bran contains approximately 25 % neutral detergent fiber and 25 to 30 % starch. Rice bran has a greater concentration of P than most other plant ingredients, but 75 to 90 % of the P is bound in phytate. Inclusion of microbial phytase in the diets is, therefore, necessary if rice bran is used. Rice bran may contain 15 to 24 % fat, but it may also have been defatted in which case the fat concentration is less than 5 %. Concentrations of digestible energy（DE） and metabolizable energy（ME） are slightly less in full fat rice bran than in corn, but defatted rice bran contains less than 75 % of the DE and ME in corn. The concentrat

关键词： Copra expellers Copra meal Palm kernel expellers Palm kernel meal Rice bran

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：