检索结果-南通市图书馆

Variational Approach to Heat Conduction Modeling

在线全文

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2024年第1期12卷 234-248页

作者： Slavko Đurić Ivan Aranđelović milan Milotić Faculty of Traffic Engineering University of East Sarajevo Doboj Bosnia and Herzegovina Faculty of Mechanical Engineering University of Belgrade Belgrade Republic of Serbia

It is known that Fourier’s heat equation, which is parabolic, implies an infinite velocity propagation, or, in other words, that the mechanism of heat conduction is established instantaneously under all conditions. This is unacceptable on physical grounds in spite of the fact that Fourier’s law agrees well with experiment. However, discrepancies are likely to occur when extremely short distances or extremely short time intervals are considered, as they must in some modern problems of aero-thermodynamics. Cattaneo and independently Vernotte proved that such process can be described by Heaviside’s telegraph equation. This paper shows that this fact can be derived using calculus of variations, by application of the Euler-Lagrange equation. So, we proved that the equation of heat conduction with finite velocity propagation of the thermal disturbance can be obtained as a solution to one variational problem.

关键词： Telegraph Equation Heat Equation Heat Conduction Calculus of Variations

Variational Approach to 2D and 3D Heat Conduction Modeling

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 Applied Mathematics and Physics 2024年第4期12卷 1383-1400页

The paper proposes an approximate solution to the classical (parabolic) multidimensional 2D and 3D heat conduction equation for a 5 × 5 cm aluminium plate and a 5 × 5 × 5 cm aluminum cube. An approximate solution of the generalized (hyperbolic) 2D and 3D equation for the considered plate and cube is also proposed. Approximate solutions were obtained by applying calculus of variations and Euler-Lagrange equations. In order to verify the correctness of the proposed approximate solutions, they were compared with the exact solutions of parabolic and hyperbolic equations. The paper also presents the research on the influence of time parameters τ as well as the relaxation times τ ∗ to the variation of the profile of the temperature field for the considered aluminum plate and cube.

关键词： Classical Equation of Heat Conduction Generalized Equation of Heat Conduction Calculus of Variations Approximate Solution

Multi-Pollutant Formation and Control in Pressurized Oxy-Combustion:SO_(x),nO_(x),Particulate Matter,and Mercury

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 2024年第8期39卷 127-153页

作者： Gaofeng Dai Jiaye Zhang Zia ur Rahman Yufeng Zhang Yili Zhang milan Vujanović Hrvoje Mikulčić nebojsa Manic Aneta Magdziarz Houzhang Tan Richard L.Axelbaum Xuebin Wang MOE Key Laboratory of Thermo-Fluid Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China School of Ecology and Environment Hainan UniversityHaikou 570228China Faculty of Mechanical Engineering&naval Architecture University of ZagrebZagreb 10000Croatia Faculty of Mechanical Engineering University of MariborMaribor 2000Slovenia Faculty of Mechanical Engineering University of BelgradeBelgrade 11120Serbia AGH University of Krakow Krakow 30059Poland Consortium for Clean Coal Utilization Department of EnergyEnvironmental&Chemical EngineeringWashington University in St.LouisSt.LouisMO 63130USA

Oxy-combustion is a promising carbon-capture technology,but atmospheric-pressure oxy-combustion has a relatively low net efficiency,limiting its application in power *** pressurized oxycombustion(POC),the boiler,air separation unit,flue gas recirculation unit,and CO_(2)purification and compression unit are all operated at elevated pressure;this makes the process more efficient,with many advantages over atmospheric pressure,such as low nO_(x)emissions,a smaller boiler size,and *** is also more promising for industrial application and has attracted widespread research interest in recent *** can produce high-pressure CO_(2)with a purity of approximately 95%,which can be used directly for enhanced oil recovery or ***,the pollutant emissions must meet the standards for carbon capture,storage,and *** of the high oxygen and moisture concentrations in POC,the formation of acids via the oxidation and solution of SO_(x)and nO_(x)can be increased,causing the corrosion of pipelines and ***,particulate matter(PM)and mercury emissions can harm the environment and human *** main distinction between pressurized and atmospheric-pressure oxy-combustion is the former’s elevated pressure;thus,the effect of this pressure on the pollutants emitted from POC—including SO_(x),nO_(x),PM,and mercury—must be understood,and effective control methodologies must be incorporated to control the formation of these *** paper reviews recent advances in research on SO_(x),nO_(x),PM,and mercury formation and control in POC systems that can aid in pollutant control in such systems.

关键词： Pressurized oxy-combustion Sulfur oxides nitrogen oxides Particulate matter Mercury Direct contact cooler Carbon capture and sequestration

Effects of methionine supplementation in a reduced protein diet on growth performance, oxidative status, intestinal health, oocyst shedding, and methionine and folate metabolism in broilers under Eimeria challenge

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2024年第05期 1951-1979页

作者： Guanchen Liu Venkata Sesha Reddy Choppa milan Kumar Sharma Hanseo Ko Janghan Choi Woo Kyun Kim Department of Poultry Science University of Georgia

Background This study investigated effects of different methionine(Met) supplementation levels in a reduced protein diet on growth performance, intestinal health, and different physiological parameters in broilers under Eimeria challenge. A total of 600 fourteen-day-old Cobb500 male broilers were challenged with E. maxima, E. tenella, and E. acervulina, and randomly allocated in a 2 × 5 factorial arrangement. Birds received normal protein diets(20% crude protein, nCP) or reduced protein diets(17% crude protein, LCP), containing 2.8, 4.4, 6.0, 7.6, and 9.2 g/kg of *** On 6 and 9 days post inoculation(DPI), increasing Met level linearly improved the growth performance(P ng linearly increased as Met level increased(P nal villus height(VH):crypt depth(CD) in the LCP groups were higher on 6 DPI(P n 9 DPI(P nCP groups. Jejunal CD and duodenal VH:CD changed quadratically as Met level increased(P n 6 DPI, liver glutathione(GSH) and glutathione disulfide(GSSG) linearly increased as Met level increased(P n 9 DPI, GSSG quadratically increased, whereas GSH:GSSG quadratically decreased as Met levels increased(P n of amino acid transporters linearly decreased as Met level increased(P n of zonula occludens 2 and claudin-1 linearly increased on 6 DPI whereas decreased on 9 DPI as Met level increased(P ns of cytokines were lower in the LCP groups than the nCP groups(P nteraction effects were found for the expression of IL-10 and TnFα on 6 DPI(P nly changed quadratically in the nCP group as Met level increased. The expression of Met and folate metabolism genes were lower in the LCP groups than the nCP groups on 9 DPI(P n of these genes linearly or quadratically decreased as Met level increased(P nclusion These results revealed the regulatory role

关键词：

Higher Grain-Filling Rate in Inferior Spikelets of Tolerant Rice Genotype Offset Grain Yield Loss under Post-Anthesis High night Temperatures

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rice science 2024年第5期31卷 572-586,I0059-I0061页

作者： nitin SHARMA Bhupinder SInGH Subbaiyan Gopala KRISHnAn Haritha BOLLInEDI Pranab Kumar MAnDAL milan Kumar LAL Prakash Kumar JHA P.V.Vara PRASAD Anjali AnAnD Division of Plant Physiology Indian Council of Agricultural Research(ICAR)-Indian Agricultural Research Institute(IARI)New Delhi 110012India Division of Environment Science ICAR-IARINew Delhi 110012India Division of Genetics ICAR-IARINew Delhi 110012India ICAR-national Institute for Plant Biotechnology New Delhi 110012India Division of Crop Physiology and Biochemistry ICAR-National Rice Research InstituteCuttack 753006India Department of Plant and Soil Sciences Mississippi State UniversityStarkvilleMS 39762USA Feed the Future Innovation Lab for Collaborative Research on Sustainable Intensification Kansas State UniversityManhattanKS 66506USA Department of Agronomy Kansas State UniversityManhattanKS 66506USA

Increased nighttime respiratory losses decrease the amount of photoassimilates available for plant growth and yield. We hypothesized that the increased respiratory carbon loss under high night temperatures(HnT) could be compensated for by increased photosynthesis during the day following HnT exposure. Two rice genotypes, Vandana(HnT-sensitive) and nagina 22(HnT-tolerant), were exposed to HnT(4 ℃ above the control) from flowering to physiological maturity. They were assessed for alterations in the carbon balance of the source(flag leaf) and its subsequent impact on grain filling dynamics and the quality of spatially differentiated sinks(superior and inferior spikelets). Both genotypes exhibited significantly higher night respiration rates. However, only nagina 22 compensated for the high respiration rates with an increased photosynthetic rate, resulting in a steady production of total dry matter under HnT. nagina 22 also recorded a higher grain-filling rate, particularly at 5 and 10 d after flowering, with 1.5- and 4.0-fold increases in the translocation of ^(14)C sugars to the superior and inferior spikelets, respectively. The ratio of photosynthetic rate to respiratory rate on a leaf area basis was negatively correlated with spikelet sterility, resulting in a higher filled spikelet number and grain weight per plant, particularly for inferior grains in nagina 22. Grain quality parameters such as head rice recovery, high-density grains, and gelatinization temperature were maintained in nagina 22. An increase in the rheological properties of rice flour starch in nagina 22 under HnT indicated the stability of starch and its ability to reorganize during the cooling process of product formation. Thus, our study showed that sink adjustments between superior and inferior spikelets favored the growth of inferior spikelets, which helped to offset the reduction in grain weight under HnT in the tolerant genotype nagina 22.

关键词： high night temperature inferior grain pasting property radiolabeled sugar superior grain

Higher Grain-Filling Rate in Inferior Spikelets of Tolerant Rice Genotype Offset Grain Yield Loss under Post-Anthesis High night Temperatures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rice Science 2024年第5期 572-589页

作者： nitin SHARMA Bhupinder SInGH Subbaiyan Gopala KRISHnAn Haritha BOLLInEDI Pranab Kumar MAnDAL milan Kumar LAL Prakash Kumar JHA P.V.Vara PRASAD Anjali AnAnD Division of Plant Physiology Indian Council of Agricultural Research(ICAR)-Indian Agricultural Research Institute(IARI) Division of Environment Science ICAR-IARI Division of Genetics ICAR-IARI ICAR-national Institute for Plant Biotechnology Division of Crop Physiology and Biochemistry ICAR-National Rice Research Institute Department of Plant and Soil Sciences Mississippi State University Feed the Future Innovation Lab for Collaborative Research on Sustainable Intensification Kansas State University Department of Agronomy Kansas State University

Increased nighttime respiratory losses decrease the amount of photoassimilates available for plant growth and yield. We hypothesized that the increased respiratory carbon loss under high night temperatures（HnT） could be compensated for by increased photosynthesis during the day following HnT exposure. Two rice genotypes, Vandana（HnT-sensitive） and nagina 22（HnT-tolerant）, were exposed to HnT（4 ℃ above the control） from flowering to physiological maturity. They were assessed for alterations in the carbon balance of the source（flag leaf） and its subsequent impact on grain filling dynamics and the quality of spatially differentiated sinks（superior and inferior spikelets）. Both genotypes exhibited significantly higher night respiration rates. However, only nagina 22 compensated for the high respiration rates with an increased photosynthetic rate, resulting in a steady production of total dry matter under HnT. nagina 22 also recorded a higher grain-filling rate, particularly at 5 and 10 d after flowering, with 1.5- and 4.0-fold increases in the translocation of14C sugars to the superior and inferior spikelets, respectively. The ratio of photosynthetic rate to respiratory rate on a leaf area basis was negatively correlated with spikelet sterility, resulting in a higher filled spikelet number and grain weight per plant, particularly for inferior grains in nagina 22. Grain quality parameters such as head rice recovery, high-density grains, and gelatinization temperature were maintained in nagina 22. An increase in the rheological properties of rice flour starch in nagina 22 under HnT indicated the stability of starch and its ability to reorganize during the cooling process of product formation. Thus, our study showed that sink adjustments between superior and inferior spikelets favored the growth of inferior spikelets, which helped to offset the reduction in grain weight under HnT in the tolerant genotype nagina 22.

关键词：

The challenge of molecular selection in liver-limited metastatic colorectal cancer for surgical resection: a systematic review and meta-analysis in the context of current and future approaches

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Oncology Research 2024年第9期32卷 1407-1422页

作者： ROSSAnA ROnCATO JERRY POLESEL FEDERICA TOSI ELEnA PERUZZI ERIKA BRUGUGnOLI CLAUDIA LAURIA PAnTAnO MARIA FURFARO FILIPPO DI GIROLAMO ALESSAnDRO nAnI ARIAnnA PAnI nOEMI milan ELEnA DE MATTIA AnDREA SARTORE-BIAnCHI ERIKA CECCHIn Experimental and Clinical Pharmacology Unit Centro di Riferimento Oncologico di Aviano(CRO)IRCCSAviano33081Italy Department of Medicine(DMED) University of UdineUdine33100Italy Unit of Cancer Epidemiology Centro di Riferimento Oncologico di Aviano(CRO)IRCCSAviano33081Italy Department of Oncology and Hemato-Oncology Universitàdegli Studi di MilanoMilan20122Italy Department of Hematology Oncologyand Molecular MedicineGrande Ospedale Metropolitano NiguardaMilan20122Italy Oncology Pharmacy Unit IRCCS Istituto Romagnolo per lo Studio dei Tumori Dino AmadoriMeldola47014Italy Pharmacy Unit Fondazione IRCCS Istituto Tumori di MilanoMilan20122Italy Department of Pharmacy Ca’Foncello Treviso Regional HospitalPiazzale Ospedale 1Treviso31100Italy Department of Medical Surgical and Health Sciences University of TriesteTrieste34127Italy Hospital Pharmacy Cattinara HospitalAzienda Sanitaria Universitaria Giuliano IsontinaTrieste34148Italy Department of Oncology and Onco-Hematology Postgraduate School of Clinical Pharmacology and ToxicologyUniversity of MilanMilan20122Italy

Objectives:Treatment of metastatic colorectal cancer(mCRC)includes resection of liver metastases(LM),however,no validated biomarker identifies patients most likely to benefit from this *** meta-analysis aimed to assess the impact of the most relevant molecular alterations in cancer-related genes of CRC(i.e.,RAS,BRAF,SMAD4,PIK3CA)as prognostic markers of survival and disease recurrence in patients with mCRC surgically treated by LM ***:A systematic literature review was performed to identify studies reporting data regarding survival and/or recurrence in patients that underwent complete liver resection for CRC LM,stratified according to RAS,BRAF,PIK3CA,and SMAD4 mutational *** ratios(HRs)from multivariate analyses were pooled in the meta-analysis and various adjustment strategies for confounding factors were *** search was conducted in numerous databases,including MEDLInE(PubMed),Embase,Cumulative Index to nursing and Allied Health Literature(CInAHL)(EBSCO host),and WHO Global Index Medicus,through March 18th,***-analyses,editorials,letters to the editor,case reports,studies on other primary cancers,studies with primary metastatic sites other than the liver,studies lacking specific oncological outcome variables or genetic data,non-English language studies,and studies omitting residual disease data from liver metastasectomy were *** remaining 47 studies were summarized in a descriptive table which outlines the key characteristics of each study and final results were graphically ***:RAS mutation status was negatively associated with overall survival(OS)(HR,1.68;95%CI,1.54–1.84)and recurrence free survival(RFS)(HR,1.46;95%CI,1.33–1.61).A negative association was also found for BRAF regarding OS(HR,2.64;95%CI,2.15–3.24)and RFS(HR,1.89;95%CI,1.32–2.73)and SMAD4 regarding OS(HR,1.93;95%CI,1.56–2.38)and RFS(HR,1.95;95%CI,1.31–2.91).For PIK3CA only three studies were eligible and no significant associati

关键词： Metastasectomy Liver metastases RAS BRAF SMAD4 PIK3CA Colorectal

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

不同颜色风力机叶片缺陷检测系统研究与验证

传感技术学报 2024年第3期37卷 513-518页

作者：严海领刘雄飞李密兰银川科技学院信息工程学院宁夏银川750001

针对目前风力机叶片缺陷检测方法检测精度低、危险系数大、设备价格高等问题,提出一种基于LabVIEW+无人机的风力机叶片缺陷检测系统,实现了硬件平台搭建和系统软件设计,对图像处理算法进行研究,针对传统二值化算法中不同颜色风力机叶片... 详细信息

针对目前风力机叶片缺陷检测方法检测精度低、危险系数大、设备价格高等问题,提出一种基于LabVIEW+无人机的风力机叶片缺陷检测系统,实现了硬件平台搭建和系统软件设计,对图像处理算法进行研究,针对传统二值化算法中不同颜色风力机叶片阈值不同的问题,提出了应用边缘提取的检测方法。通过理论分析和实验对比了LabVIEW中边缘提取缺陷检测算子及组合算子的检测效果,并最终确定Sobel算子应用于本风力机叶片缺陷检测系统。实验表明,该系统能够实现不同颜色风力机叶片缺陷的自动、低成本检测,检测精度高达93%。

关键词：缺陷检测风力机叶片 Sobel算子无人机 LabVIEW算法验证

Characterization of value-added chemicals derived from the thermal hydrolysis and wet oxidation of sewage sludge

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2021年第1期15卷 185-198页

作者： milan Malhotra Anurag Garg Environmental Science and Engineering Department Indian Institute of Technology BombayPowai Mumbai 400076India

We evaluated the effect of hydrothermal pretreatments,i.e.,thermal hydrolysis(TH)and wet oxidation(WO)on sewage sludge to promote resource *** hydrothermal processes were performed under mild temperature conditions(140°C–180°C)in a high pressure *** reaction in acidic environment(pH=3.3)suppressed the formation of the color imparting undesirable Maillard’s *** oxidative conditions resulted in higher volatile suspended solids(VSS)reduction(~90%)and chemical oxygen demand(COD)removal(~55%)whereas TH caused VSS and COD removals of~65%and~27%,respectively at a temperature of 180°*** TH,the concentrations of carbohydrates and proteins in treated sludge were 400–1000 mg/L and 1500–2500 mg/L,***,WO resulted in solids solubilization followed by oxidative degradation of organics into smaller molecular weight carboxylic acids such as acetic acid(~400–500 mg/L).Based on sludge transformation products generated during the hydrothermal pretreatments,simplified reaction pathways are ***,the application of macromolecules(such as proteins),VFAs and nutrients present in the treated sludge are also *** future study should focus on the development of economic recovery methods for various value-added compounds.

关键词： Hydrothermal pretreatment Reaction kinetics Reaction pathway Sewage sludge Thermal hydrolysis Wet oxidation

同方期刊数据库