检索结果-南通市图书馆

Evaluation of rope shovel operators in surface coal mining using a Multi-Attribute Decision-Making model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2014年第2期24卷 259-268页

作者： Vukotic ivana Kecojevic Vladislav Department of Mining Engineering West Virginia University

Rope shovels are used to dig and load materials in surface mines. One of the main factors that influence the production rate and energy consumption of rope shovels is the performance of the operator. This paper presents a method for evaluating rope shovel operators using the Multi-Attribute Decision-Making （MADM） model. Data used in this research were collected from an operating surface coal mine in the southern United States. The MADM model consists of attributes, their weights of importance, and alter- natives. Shovel operators are considered the alternatives, The energy consumption model was developed with multiple regression analysis, and its variables were included in the MADM model as attributes. Preferences with respect to min/max of the defined attributes were obtained with multi-objective opti- mization. Multi-objective optimization was conducted with the overall goal of minimizing energy con- sumption and maximizing production rate. Weights of importance of the attributes were determined by the Analytical Hierarchy Process （AHP）, The overall evaluation of operators was performed by one of the MADM models, i.e., PROMETHEE If. The research results presented here may be used by mining professionals to held evaluate the performance of rode shovel operators in surface mining.

关键词： Rope shovel Operator evaluation Production rate Energy consumption AHP

Scheduling Framework Using Dynamic Optimal Power Flow for Battery Energy Storage Systems

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

CSEE Journal of Power and Energy Systems 2022年第1期8卷 271-280页

作者： Fulin Fan ivana Kockar Han Xu Jingsi Li Department of Electronic and Electrical Engineering University of StrathclydeGlasgowG11XWU.K Power Networks Demonstration Centre GlasgowG680EFU.K Department of Civil and Environmental Engineering University of StrathclydeGlasgowG11XJU.K

Battery energy storage systems(BESS)are instrumental in the transition to a low carbon electrical network with enhanced flexibility,however,the set objective can be accomplished only through suitable scheduling of their *** paper develops a dynamic optimal power flow(DOPF)-based scheduling framework to optimize the day(s)-ahead operation of a grid-scale BESS aiming to mitigate the predicted limits on the renewable energy generation as well as smooth out the network demand to be supplied by conventional *** DOPF,all the generating units,including the ones that model the exports and imports of the BESS,across the entire network and the complete time horizon are integrated on to a single ***,an AC-OPF is applied to dispatch their power outputs to minimize the total generation cost,while satisfying the power balance equations,and handling the unit and network constraints at each time step coupled with intertemporal constraints associated with the state of charge(SOC).Furthermore,the DOPF developed here entails the frequently applied constant current-constant voltage charging profile,which is represented in the SOC *** the practical application of a 1 MW BESS on a particular 33 kV network,the scheduling framework is designed to meet the pragmatic requirements of the optimum utilization of the available energy capacity of BESS in each cycle,while completing up to one cycle per day.

关键词： Battery energy storage day(s)-ahead scheduling dynamic optimal power flow load smoothing renewable energy

Hepatitis B and circadian rhythm of the liver

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2022年第27期28卷 3282-3296页

作者： ivana Skrlec Jasminka Talapko Department of Biophysics Biologyand ChemistryFaculty of Dental Medicine and HealthJ.J.Strossmayer University of OsijekOsijek 31000Croatia Department of Anatomy Histology EmbryologyPathology Anatomy and Pathology HistologyFaculty of Dental Medicine and HealthOsijek 31000Croatia

The circadian rhythm in humans is determined by the central clock located in the hypothalamus’s suprachiasmatic nucleus,and it synchronizes the peripheral clocks in other *** clock genes and clock-controlled genes exist in almost all cell *** have an essential role in many physiological processes,including lipid metabolism in the liver,regulation of the immune system,and the severity of *** addition,circadian rhythm genes can stimulate the immune response of host cells to virus *** B virus(HBV)infection is the leading cause of liver disease and liver cancer *** infection depends on the host cell,and hepatocyte circadian rhythm genes are associated with HBV replication,survival,and *** core circadian rhythm proteins,REV-ERB and brain and muscle ARNTL-like protein 1,have a crucial role in HBV replication in *** addition to influencing the virus’s life cycle,the circadian rhythm also affects the pharmacokinetics and efficacy of antiviral ***,it is vital to apply antiviral therapy at the appropriate time of day to reduce toxicity and improve the effectiveness of antiviral *** these reasons,understanding the role of the circadian rhythm in the regulation of HBV infection and host responses to the virus provides us with a new perspective of the interplay of the circadian rhythm and anti-HBV ***,this review emphasizes the importance of the circadian rhythm in HBV infection and the optimization of antiviral treatment based on the circadian rhythm-dependent immune response.

关键词： Circadian rhythm Clock genes Hepatitis B virus Immune system Liver

Coalification and coal alteration under mild thermal 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

International Journal of Coal Science & Technology 2018年第3期5卷 358-373页

作者： Pavel Straka ivana Sykorova Institute of Rock Structure and Mechanics v.v.i The Czech Academy of Sciences V Holegovickach 41 18209 Prague 8Czech Republic

Coalification temperatures are often considered to be approximately 100-170 ℃ for bituminous coal and 170-275 ℃ for anthracite. However, our micropetrographic observations, solid state ^27Al magic-angle spinning nuclear magnetic resonance measurements, interpretation of δ^13C values for whewellite in pelosiderite concretions from Carboniferous sediments, and assessment of whewellite thermal stability show that coalification temperatures can be significantly lower. Also the temperatures of coal alteration may be substantially lower than is stated. Ordinarily, high- temperature alteration is reported, but microthermometric measurements of fluids temperatures and micropetrographic observations show that the coal alteration can take place at low temperatures. For this reason, coals from the Kladno- Rakovnik Basin, part of Late Paleozoic continental basins of the Czech Republic, were analyzed. Regarding coalification, micropetrographic characterizations of unaltered coals, the presence of thermally unstable Al complexes in the coal organic mass documented using ^27Al MAS NMR method, and proven occurrence of whewellite in pelosiderite concretions suggest a lower coalification temperature, max. -70 ℃. Regarding coal alteration, micropetrographic observations revealed （a） the weaker intensity of fluorescence of liptinite, （b） mylonitic structures and microbreccia with carbonate fluid penetration, and （c） high oxygen content in coals （37-38 wt.%）. These phenomena are typical for thermal and oxidative alteration of coal. As the temperature of carbonate fluids inferred from fluid inclusion analysis was evaluated as -100-113 ℃, the temperature of coal alteration was suggested as -113℃; the alteration was caused by hot hydrothermal fluids.

关键词： Coalification Thermal and oxidative alteration Kladno-Rakovn Basin - Al complexes ^27Al MAS NMR Fluid inclusions δ^13C Whewellite

Giant thermoelectric power factor in charged ferroelectric domain walls of GeTe with Van Hove singularities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 19-26页

作者： Ðorđe Dangić Stephen Fahy ivana Savić Department of Physics University College CorkCollege RoadCork T12 K8AFIreland Tyndall National Institute Dyke ParadeCork T12 R5CPIreland

Increasing the Seebeck coefficient S in thermoelectric materials usually drastically decreases the electrical conductivity σ,making significant enhancement of the thermoelectric power factor σS^(2) extremelly *** we predict,using first-principles calculations,that the extraordinary properties of charged ferroelectric domain walls(DWs)in GeTe enable a five-fold increase ofσS^(2) in the DW plane compared to *** key reasons for this enhancement are the confinement of free charge carriers at the DWs and Van Hove singularities in the DW electronic band structure near the Fermi level.

关键词： ferroelectric walls extreme

Leaf turgor loss point at full hydration for 41 native and introduced tree and shrub species from Central Europe

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 Plant Ecology 2020年第6期13卷 754-756页

作者： Norbert Kunert ivana Tomaskova Department of Genetics and Physiology of Forest Trees Faculty of Forestry and Wood SciencesCzech University of Life Sciences PragueSuchdolCzech Republic Smithsonian Conservation Biology Institute Ecology Center1500 Remount RoadFront RoyalVA 22630USA

The last years,Central European forests have suffered from drought as a direct consequence of climate *** these forests have a long management history and it lies in the landowner’s responsibility to replant damaged ***,landowners and the government are searching currently for species suitable to replant in areas affected by tree *** is a matter of fact that good knowledge of drought resistance of species is a critical measure for the current replanting *** determined a widely recognized trait for leaf drought tolerance(leaf water potential at turgor loss point at full hydration,πtlp)in 41 woody species native or introduced in Central *** osmometric rapid assessment method was used to measure the leaf osmotic potential at full hydration(πosm)of sun-exposed leaves and converted toπ***πtlp of the native species was−2.33±0.33 *** less negativeπtlp was found in the introduced species Aesculus hypocastania and was at−1.70±0.11 *** most negativeπtlp,and thus the potentially highest drought tolerance,were found in the introduced species Pseudotsuga menzesii and was at−3.02±0.14 *** or less negativeπtlp is associated with lower drought tolerance,whereas low or more negativeπtlp stands for higher resistance to drought *** example,the two native species Illex aquifolium and Alnus glustinosa are species naturally associated with moist habitats and are characterized by the least negativeπtlp of−1.75±0.02 and−1.76±0.03 MPa,respectively.

关键词： osmotic potential drought tolerance leaf hydraulic trait permanent wilting point tree mortality woody species climate change

The origin of the lattice thermal conductivity enhancement at the ferroelectric phase transition in GeTe

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2021年第1期7卷 529-536页

作者： Đorđe Dangić Olle Hellman Stephen Fahy ivana Savić Department of Physics University College CorkCorkIreland Tyndall National Institute CorkIreland Department of Physics Chemistry and Biology(IFM)Linköping UniversityLinköpingSweden

The proximity to structural phase transitions in IV-VI thermoelectric materials is one of the main reasons for their large phonon anharmonicity and intrinsically low lattice thermal conductivityκ.However,theκof GeTe increases at the ferroelectric phase transition near 700 *** first-principles calculations with the temperature dependent effective potential method,we show that this rise inκis the consequence of negative thermal expansion in the rhombohedral phase and increase in the phonon lifetimes in the high-symmetry *** anharmonicity near the phase transition induces non-Lorentzian shapes of the phonon power *** account for these effects,we implement a method of calculatingκbased on the Green-Kubo approach and find that the Boltzmann transport equation underestimatesκnear the phase *** findings elucidate the influence of structural phase transitions onκand provide guidance for design of better thermoelectric materials.

关键词： phase transition ferroelectric

Dynamics along the epithelial-cancer biointerface:Hidden system complexities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BIOCELL 2023年第11期47卷 2321-2334页

作者： ivana PAJIC-LIJAKOVIC MILAN MILIVOJEVIC Faculty of Technology and Metallurgy Department of Chemical EngineeringUniversity of BelgradeBelgradeSerbia

The biointerface dynamics influence any cancer spreading through the epithelium since it is documented in the early stages some malignancies(like epithelial cancer).The altered rearrangement of epithelial cells has an impact on the development of ***,it is necessary to comprehend the underlying biological and physical mechanisms of this biointerface dynamics for early suppression of *** the biological mechanisms include cell signaling and gene expression,the physical mechanisms are several physical parameters such as the epithelial-cancer interfacial tension,epithelial surface tension,and compressive stress accumulated within the *** the segregation of epithelia-cancer co-cultured systems was widely investigated,the role of these physical parameters in cell reorganization is still not fully ***,this review is focused on clarifying the role that some physical parameters have during cell reorganization within the epithelial cell clusters and cancer spread within co-cultured *** have applied the developed biophysical model to point out the inter-relations among physical parameters that influence cell reorganization within epithelial-cancer co-cultured *** main results of this theoretical consideration have been assessed by integrating the biophysical model with biological and bio-mechanical experiments from the available *** epithelial-cancer interfacial tension leads to the reduction of the biointerface area,which leads to an increase in the compressive residual stress within the epithelial clusters depending on the viscoelasticity of the epithelial *** stress impacts epithelial rearrangement and the dynamics along the biointerface by influencing the epithelial surface tension and epithelial-cancer interfacial ***,the interrelation between the epithelial surface tension and epithelial-cancer interfacial tension influences the spread of cancer cells.

关键词： Collective cell migration Cell compressive residual stress Viscoelasticity Epithelial surface tension Epithelial-cancer interfacial tension Supracellular actin network

Surface activity of cancer cells:The fusion of two cell aggregates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BIOCELL 2023年第1期47卷 15-25页

作者： ivana PAJIC-LIJAKOVIC MILAN MILIVOJEVIC Faculty of Technology and Metallurgy Belgrade UniversityBelgradeSerbia

A key feature that distinguishes cancer cells from all other cells is their capability to spread throughout the *** how cancer cells collectively migrate by following molecular rules which influence the state of cell-cell adhesion contacts has been comprehensively formulated,the impact of physical interactions on cell spreading remains less *** effects of physical interactions exist as the interplay between various physical parameters such as(1)tissue surface tension,(2)viscoelasticity caused by collective cell migration,and(3)solid stress accumulated in the cell aggregate core *** review aims to point out the role of these physical parameters in cancer cell spreading by considering and comparing the rearrangement of various mono-cultured cancer and epithelial model systems such as the fusion of two cell *** epithelial cells undergo volumetric cell rearrangement driven by the tissue surface tension,which directs cell movement from the surface to the core region of two-aggregate systems,cancer cells rather perform surface cell *** cells migrate toward the surface of the two-aggregate system driven by the solid stress while the surface tension is significantly *** solid stress,accumulated in the core region of the two-aggregate system,is capable of suppressing the movement of epithelial cells that can undergo the jamming state transition;however,this stress enhances the movement of cancer *** have focused here on the multi-scale rheological modeling approaches that aimed at reproducing and understanding these biological systems.

关键词： Collective cell migration Tissue surface tension Surface activity of cancer cells Viscoelasticity Solid stress The state of cell-cell adhesion contacts