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Application of a water quality model for determining instream aeration station location and operational rules:A case study

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Water Science and Engineering 2018年第1期11卷 8-16页

作者： Charles S.Melching Melching Water solutions LLC GreenfieldWI 53221USA

Instream aeration has been used as a supplement to secondary treatment or a substitute for tertiary treatment for meeting dissolved oxygen （dO） standards in rivers. Many studies have used water quality models to determine the number, location, and capacity of instream aeration stations （IASs） needed to meet dO standards in combination with other pollution control measures. dO concentrations have been improved in the North Shore Channel and North Branch Chicago River by the devon Avenue IAS for more than 35 years. A study was initiated to determine whether it was better to rehabilitate or relocate this station and to determine appropriate operational guidance for the IAS at the selected location. A water quality model capable of simulating dO concentrations during unsteady flow was used to evaluate the proper location for an IAS and operational guidance for this IAS. Three test years, a dry year, a wet year, and an extreme year, were considered in the evaluation. The study found that the devon Avenue IAS should be rehabilitated as this location performed as well as or better than any of 10 alternative locations. According to the new operational guidance for this IAS, the amount of time with blowers operating could be substantially reduced compared to traditional operations while at the same time the attainment of the dO standards could be increased. This study shows that a carefully designed modeling study is key to effective selection, location, and operation of IASs such that attainment of dO standards can be maximized while operation hours of blowers can be minimized.

关键词： Instream aeration dissolved oxygen Water quality modeling Water quality management Computer simulation

Verification of Inverse Quench-Hardening Phenomena in Bearing Steel Specimens by Experiment and Computer Simulation

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材料热处理学报 2004年第5期25卷 465-470页

作者： Kyozo Arimoto Chuanrong Jin Shigeyuki Tamura Kiyoshi Funatani Mamoru Tajima Arimotech Ltd. Osaka JapanCRC Solutions Corp. Tokyo Japan CRC Solutions Corp. Tokyo Japan IMSTInst. Nagoya JapanKanagawa University Kanagawa Japan

The appearance of lower hardness at the surface than at the core after through-hardening of steels is known as "inverse quench-hardening." Pioneering work was performed in the 1970s by establishing a simple test procedure where cylindrical specimens were cooled by air and brine sequentially to produce the effect. This phenomenon was described in relation to the polymer quenching and its effect to the improvement in the fatigue strength of the steel in the 1990s. The hardening mechanism in the same specimens as the pioneering work was recently examined using a finite element simulation method. However, this work has not been completed for lack of experimental quenching cooling curves for the comparisons. In this study, the same experiments using 20mm diameter cylindrical specimens as those of the pioneering work were conducted to obtain cooling curves and hardness distributions for comparing simulated results. Experimental cooling curves showed a temperature recovery as predicted by the simulation. Also the inverse quench-hardening phenomena were found in the measured and simulated hardness distributions of the specimens.

关键词：热处理逆淬火硬化轴承钢计算机模拟

Numerical Studies of Vanka-Type Smoothers in Computational Solid Mechanics

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Advances in Applied Mathematics and Mechanics 2009年第1期1卷 29-55页

作者： Hilmar Wobker Stefan Turek Institute of Applied Mathematics LS3TU DortmundD-44227 DortmundGermany

In this paper multigrid smoothers of Vanka-type are studied in the context of Computational Solid Mechanics(CSM).These smoothers were originally developed to solve saddle-point systems arising in the field of Computational Fluid dynamics(CFd),particularly for incompressible flow *** treating(nearly)incompressible solids,similar equation systems arise so that it is reasonable to adopt the‘Vanka idea’for *** there exist numerous studies about Vanka smoothers in the CFd literature,only few publications describe applications to solid mechanical *** this paper we want to contribute to close this *** depict and compare four different Vanka-like smoothers,two of them are oriented towards the stabilised equal-order Q_(1)/Q_(1)finite element *** means of different test configurations we assess how far the smoothers are able to handle the numerical difficulties that arise for nearly incompressible material and anisotropic *** the one hand,we show that the efficiency of all Vanka-smoothers heavily depends on the proper parameter *** the other hand,we demonstrate that only some of them are able to robustly deal with more critical ***thermore,we illustrate how the enclosure of the multigrid scheme by an outer Krylov space method influences the overall solver performance,and we extend all our examinations to the nonlinear finite deformation case.

关键词： Coupled multigrid Vanka smoother linear and finite elasticity nearly incompressible material saddle point systems finite elements

Constructing donor–Acceptor‑Linked COFs Electrolytes to Regulate Electron density and Accelerate the Li^(+)Migration in Quasi‑Solid‑State Battery

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Nano-Micro Letters 2025年第1期17卷 456-471页

作者： Genfu Zhao Hang Ma Conghui Zhang Yongxin Yang Shuyuan Yu Haiye Zhu Yongjiang Sun Hong Guo School of Materials and Energy International Joint Research Center for Advanced Energy Materials of Yunnan ProvinceYunnan UniversityKunming 650091People’s Republic of China Yunnan Yuntianhua Co. LtdR&D CenterKunming 650228People’s Republic of China Southwest United Graduate School Kunming 650091People’s Republic of China

Regulation the electronic density of solid-state electrolyte by donor–acceptor(d–A)system can achieve highly-selective Li^(+)transportation and conduction in solid-state Li metal *** study reports a high-performance solid-state electrolyte thorough d–A-linked covalent organic frameworks(COFs)based on intramolecular charge transfer *** other reported COFbased solid-state electrolyte,the developed concept with d–A-linked COFs not only achieves electronic modulation to promote highly-selective Li^(+)migration and inhibit Li dendrite,but also offers a crucial opportunity to understand the role of electronic density in solid-state Li metal *** introduced strong electronegativity F-based ligand in COF electrolyte results in highlyselective Li^(+)(transference number 0.83),high ionic conductivity(6.7×10^(-4)S cm^(−1)),excellent cyclic ability(1000 h)in Li metal symmetric cell and high-capacity retention in Li/LiFePO_(4)cell(90.8%for 300 cycles at 5C)than substituted C-and N-based *** is ascribed to outstanding d–A interaction between donor porphyrin and acceptor F atoms,which effectively expedites electron transferring from porphyrin to F-based ligand and enhances Li^(+)***,we anticipate that this work creates insight into the strategy for accelerating Li^(+)conduction in high-performance solid-state Li metal batteries through d–A system.

关键词： Electronic modulation engineering donor-acceptor-linked covalent organic frameworks Quasi-solid-state Li metal battery

Probing temperature-dependent interlayer coupling in a MoS2/h-BN heterostructure

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Nano Research 2020年第2期13卷 576-582页

作者： Hamin Park Gwang Hyuk Shin Khang June Lee Sung-Yool Choi School of Electrical Engineering Centerfor Advanced Materials discovery towards 3d display KAISTDaejeon 34141Republic of Korea

Stacking of atomically thin layers of two-dimensional materials has revealed extraordinary physical phenomena owing to van der Waals(vdW)interaction at the ***,most of the studies focused on the transition metal dichalcogenide(TMd)/TMd heterostructure,while the interlayer coupling of the TMd/hexagonal boron nitride(h-BN)heterostructure has not been extensively explored despite its *** this study,the temperature-dependent interlayer coupling is demonstrated in a heterostructure of molybdenum disulfide(MoS2)and *** interface between MoS2 and the insulating substrate exerts a significant spectroscopic impact on MoS2 through substrate-induced local strain,charged impurity,and vdW *** non-resonant conditions,temperature-dependent peak shifts in Raman and photoluminescence(PL)spectra of MoS2 reveal the evolution of interlayer *** frequencies and PL peak energies at different temperatures demonstrate how substrate-induced strain,impurity,and vdW interactions at the interface influence phonon vibration and excitonic transition of *** resonant conditions at low temperature,anomalous Raman modes appear in the MoS2/h-BN heterostructure because of the enhanced electron-phonon coupling and vdW *** anomalous Raman modes are quantitatively investigated by the deconvolution of the resonance Raman spectra and described by interlayer coupling at low temperature,in agreement with complementary indications from the temperature-dependent evolution of non-resonant Raman and PL spectra.

关键词： van der Waals heterostructures interlayer coupling Raman spectroscopy excitonic resonance photoluminescence

POTENTIAL OF IN VIVO LATENT-TIME ESTIMATION BY LASER ANd OPTICAL TECHNIQUES IN CLINICAL ANd EXPERIMENTAL dERMATOLOGY

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Journal of Innovative Optical Health Sciences 2011年第4期4卷 421-428页

作者： NATALJA SKREBOVA EIKJE MC Professional OU Voistluse 23/25-35Tallinn 10132Estonia

The lag(latency)time(LT)is known in dermatology clinic as an asymptomatic period till the development of skin *** the laboratory,the LT might determine the interval from"zero"point until the peak(s)of changes in measured laboratory parameter during the performed *** paper discusses methodological and technical aspects of precise measurement of the LT in the living healthy and pathological skin by laser and optical technologies through clinical and experimental applications in *** on a dynamics approach to measure,calculate and interpret the LT in blood and in interstitialfluid compartments of the skin tissue,this method has a potential to promote deeper understanding of the role of complex dynamic processes in the skin at a level of a molecule,and/or an organ in a whole *** method of the LT measurement in vivo also promotes new understanding of(patho)physiological,diagnostic and pharmacological aspects of certain dynamic skin lesions and dynamic complex processes that happen in the *** laser and optical techniques showed high reliability and objectivity in collecting data from rapidly changed skin lesions and processes,demonstrating the LT measurement as a very easy-to-use calculation procedure with high informativity,which is extremely important for the clinical and laboratory environment.

关键词： Lag/latency time in vivo skin laser and optical technologies

Sulphite measurement and its influence on Hg behaviour in wet-limestone flue-gas desulphurization

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Clean Energy 2020年第4期4卷 360-371页

作者： Ida Masoomi Sophia Bruttel Marc Oliver Schmid Günter Scheffknecht Univ.-Prof.dr.techn.Günter Scheffknecht University of StuttgartInstitute of Combustion and Power Plant Technology—IFKPfaffenwaldring 23D-70569 StuttgartGermany

The most abundant and typical reducing agent for oxidized mercury in the slurry of wet flue-gas desulphurization(FGd)is the absorbed sulphur dioxide(SO_(2)),which is present as different species of bisulphite or sulphite,depending on the pH of the *** this study,two different measurement principles for continuous sulphite measurement in the slurry of lab-scale FGd were investigated to check their feasibility to be implemented in a wet *** first method is based on light absorbance at the characteristic wavelength of sulphite measurement using a spectrophotometer and,in the second method,sulphite is measured as sulphur dioxide using a gas *** addition,the correlation of sulphite concentration and mercury(Hg)in the slurry can be shown by measuring sulphite *** was concluded that using a spectrophotometer leads to distorted *** contrast,measuring sulphite as SO2 in the gas phase proved to be more *** implementation of the measurement technique in the lab-scale FGd showed promising results for sulphite ***,the correlation of Hg and sulphite concentration could be shown at different synthetic slurries containing different *** a slurry without halides demonstrated the ambivalent influence of sulphite in reactions involving Hg,in which sulphite acts as a ligand for Hg complexes as well as a reducing agent,depending on the existing ***,in the presence of halides,the role of sulphite was less significant.

关键词： flue-gas cleaning flue-gas desulphurization mercury re-emission sulphite measurement

Effect of methanol extract of Ricinus communis seed on reproduction of male rats

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Asian Journal of Andrology 2006年第1期8卷 115-121页

作者： Yinusa Raji Ahmed Kolade Oloyo Ayodele Olufemi Morakinyo department of Physiology College of MedicineUniversity of IbadanIbadan 23 402Nigeria

Aim： To investigate the effect of methanol extract of Ricinus communis seed （RCE） on male rats reproductive functions. Methods： Thirty-two male albino rats were divided into four groups. Groups 1, 2 and 3 were gavaged with 0.2 mL of 2.5% tween 80 （RCE vehicle; control） or 20 mg/（kg-d） and 40 mg/（kg-d） of RCE, respectively, for 30 days, and group 4 was also gavaged with 40 mg/（kg.d） of RCE, but was allowed a recovery periold of 30 days. Five untreated female rats were cohabited with male rats in each group from day 25 of RCE treatment for 5 days, except group 4, where cohabitation began on day 25 of the recovery period. All male rats were sacrificed 24 h after the experiments. The female rats were laparatomized on day 19 of pregnancy and the number and weight of litters were recorded. Results： There was a significant decrease （P 〈 0.01） in the weight of the reproductive organs, sperm functions and serum levels of testosterone in RCE treated rats. There was disorganization in the cytoarchitecture of the testes, disruption of the seminiferous tubules and erosion of the germinal epithelium. The number and weight of litters of rats in groups 2 and 4 decreased significantly （P 〈 0.05） but no changes were observed in group 3. RCE caused no changes in liver, kidney, heart or body weights in male rats. Conclusion： RCE has a reversible negative impact on male reproductive functions, which appears to be mediated via gonadal disruption in testosterone secretion. （Asian J Androl 2006 Jan; 8： 115-121）

关键词： Ricinus communis sperm fertility testosterone reproduction

Leveraging the potential of big genomic and phenotypic data for genome-wide association mapping in wheat

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The Crop Journal 2024年第3期12卷 803-813页

作者： Moritz Lell Yusheng Zhao Jochen C.Reif Leibniz Institute of Plant Genetics and Crop Plant Research(IPK) Corrensstraße 3D-06466 SeelandGermany

Genome-wide association mapping studies(GWAS)based on Big data are a potential approach to improve marker-assisted selection in plant *** number of available phenotypic and genomic data sets in which medium-sized populations of several hundred individuals have been studied is rapidly *** these data and using them in GWAS could increase both the power of QTL discovery and the accuracy of estimation of underlying genetic effects,but is hindered by data heterogeneity and lack of *** this study,we used genomic and phenotypic data sets,focusing on Central European winter wheat populations evaluated for heading *** explored strategies for integrating these data and subsequently the resulting potential for *** interoperability between data sets was greatly aided by some overlapping genotypes and a linear relationship between the different phenotyping protocols,resulting in high quality integrated phenotypic *** this context,genomic prediction proved to be a suitable tool to study relevance of interactions between genotypes and experimental series,which was low in our *** to expectations,fewer associations between markers and traits were found in the larger combined data than in the individual experimental ***,the predictive power based on the marker-trait associations of the integrated data set was higher across data ***,the results show that the integration of medium-sized to Big data is an approach to increase the power to detect QTL in *** results encourage further efforts to standardize and share data in the plant breeding community.

关键词： Big data Genome-wide association study data integration Genomic prediction Wheat