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flow的相关文献在1989年到2023年内共计1449篇,主要集中在肿瘤学、数学、力学 等领域,其中期刊论文1392篇、会议论文2篇、专利文献55篇;相关期刊396种,包括中国科学、金属学报:英文版、世界胃肠病学杂志:英文版等; 相关会议2种,包括2007中国建筑节能年度论坛、沪、苏、闽暨全军生物技术药物研讨会等;flow的相关文献由3540位作者贡献,包括Heuy Dong Kim、Toshiaki Setoguchi、Shinichiro Yanase等。

flow—发文量

期刊论文>

论文:1392 占比:96.07%

会议论文>

论文:2 占比:0.14%

专利文献>

论文:55 占比:3.80%

总计:1449篇

flow—发文趋势图

flow

-研究学者

  • Heuy Dong Kim
  • Toshiaki Setoguchi
  • Shinichiro Yanase
  • 顾幸生
  • Hidemi Yamada
  • Kern E. Kenyon
  • LI
  • Severino Rodrigues de Farias Neto
  • Swapan Kumar Ghosh
  • Yingzi Jin
  • 期刊论文
  • 会议论文
  • 专利文献

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    • Chang Huang; Shuzhan Bai; Guoxiang Li; Ke Sun
    • 摘要: The influence of heterogeneous flow injection of urea at different velocities and temperatures on NO x conversion efficiency,ammonia storage and ammonia leakage is investigated experimentally.A diesel engine employing a selective catalytic reduction(SCR)technology is considered.It is found that for a fixed injection velocity,the degree of ammonia leakage changes depending on the temperature.The higher the temperature,the faster the catalytic reduction reaction and the smaller the degree of ammonia leakage.The temperature has a great influence on the catalytic reduction reaction rate.At an injection velocity of 10000/h,the average reaction rate at 420°C is 12 times higher than that at 180°C.The injection velocity has a weak influence on the reaction rate.When the injection velocity changes from 10000/h to 40000/h at the same temperature,the average reaction rate does not change appreciably.However,increasing the space velocity can accelerate the leakage of ammonia,thereby miti-gating the benefits associated with the NO_(x) conversion.
    • Dino Premilovac; Brad A.Sutherland
    • 摘要: The brain has a high metabolic rate and consumes approximately 20%of the total energy in the body at any given time.Although it requires a large amount of energy to function,the brain cannot store significant amounts of energy making it exquisitely dependent on constant nutrient supply via blood flow.When blood flow to the brain is impaired,such as during stroke,there are rapid and severe consequences for the neurons that depend on this constant energy supply.
    • Emilien Arnaud; Sylvain Leclere; Martin Petitprez; Gilles Vincent; Christine Ammirati
    • 摘要: Severe forms of coronavirus disease 2019 (COVID-19)can lead to hypoxemic pneumonia and the need for treatment with high-flow nasal cannula (HFNC) oxygen therapy.This treatment decreases the need for subsequent invasive ventilation in patients with hypoxemic pneumonia.The oxygen flow in the nasal cannula is driven pneumatically or using a turbine.Oxygen and air are mixed (giving the fraction of inspired oxygen[FiO;]) and propelled at up to 80L·min;.The propelled gases must be heated and humidified.HFNC system is not intended for use outside a hospital environment.
    • E Du; Shuhao Shen; Anqi Qiu; Nanguang Chen
    • 摘要: Laser speckle imaging has been widely used for in-vivo visualization of blood perfusion in biological tissues.However,existing laser speckle imaging techniques suffer from limited quantification accuracy and spatial resolution.Here we re-port a novel design and implementation of a powerful laser speckle imaging platform to solve the two critical limitations.The core technique of our platform is a combination of line scan confocal microscopy with laser speckle autocorrelation imaging,which is termed Line Scan Laser Speckle Autocorrelation Imaging(LS-LSAI).The technical advantages of LS-LSAI include high spatial resolution(~4.4μm)for visualizing and quantifying blood flow in microvessels,as well as video-rate imaging speed for tracing dynamic flow.
    • Víctor Rogelio Tirado Picado
    • 摘要: An experimental unit was built which was located in the vicinity of the domestic wastewater treatment plant of the Municipality of San Marcos in the Department of Carazo. Said unit consisted of two welded metal barrels with a total height of 1.8 m and a diameter of 0.90 m, likewise, this unit comprised three functional zones;the first or input area composed of a collection unit, a driving unit, a flow control unit, and two distribution units;the second or packed zone, which is the axis of the system because it is there where bacterial growth takes place and where the removal of organic matter takes place;and an outlet composed of PVC pipe [1]. The main objective of this work was to determine how efficient a rocky filter turns out to be, using stabilization pond effluent as a post-treatment unit using red concrete as a filter medium. The study consisted in carrying out laboratory tests on water samples taken from the influent and effluent of a filter made up of red rock, as a filter medium, in order to determine the percentage of organic matter removal efficiency that it has used a hydraulic retention time of 19 hours, 15 hours, and 12 hours [2]. Among the aspects to be considered in the experimental study was the characterization of the effluent from the treatment system of San Marco, Carazo, to determine the quality of water that will be of interest to the study [3]. In this stage, four composite samplings were carried out, two of 12 hours and two of 24 hours, in which physical, chemical, and microbiological parameters were analyzed. Likewise, to determine the efficiency of the filter, the same parameters considered in the characterization of the lagoon effluent were analyzed, obtaining removal efficiencies of up to 55.53% in organic matter, and 64.60% in suspended solids for a hydraulic retention time of 19 hours;In the same way, the efficiency of the filter was carried out for retention times of 15 hours and 12 hours, in which organic matter removals of 67.84% and 56.59% and 82.77% and 77.51% in total suspended solids were found, respectively.
    • Leonid Kanevskyy
    • 摘要: This work presents the study of a throttling water jet through the opening 2.45 mm in diameter, with a speed of 21.2 meters per second hitting a pressure point distance of 30 mm in a dead impact wall. The impact turns instantly the throttling water jet into the circular flow, which is rotating in a vortical manner around the mixing chamber longitudinal axis with a speed of rotation of 122 revolutions per second (The miniature injector LK26M, Figure 4 Charts 5, Figure 5). With sufficient large air intake openings, the increase of the vortex flow speed, the suction pressure of the circular, vortex flow forestall the static pressure increase in the filling in the chamber circular flow, that is directed to the air intake openings, as a result, water running out of air intake openings is impossible and only air is being sucked in the mixing chamber, the circular flow is accelerated and in a fraction of a second stabilized.
    • Alex Waite; Sunny Wang; Chris Aguillon; Alex Nazarchuk
    • 摘要: Climate change impacts,such as higher average temperatures and prolonged drought conditions,have affected regional and local water supply reliability.The City of Santa Monica has long been a leader in promoting sustainability and is implementing several innovative water supply projects to develop alternative water supplies-including stormwater,dry weather urban runoff,and municipal wastewater-to provide a diverse,sustainable,and drought-resilient local water supply.The City is developing the first MBR(Membrane Bioreactor)system and cartridge filtration system to receive log removal credits for potable reuse in the State of California,the first stormwater treatment project in the State of California that will augment groundwater supplies via direct injection,and the first municipal flow reversal RO(Reverse Osmosis)system in the United States.Collectively,these alternative water supplies sources will reduce the City’s reliance on imported water supplies and meet as much as 99%of its water demands through local water resources.
    • Chaden Moussa Haydar; Khaled Tarawneh; Nada Nehme; Mazen Amaireh; Ali Yaacoub; Walaa Diab
    • 摘要: Surface water quality is largely influenced by both natural processes and anthropogenic inputs. This study involves the characterization of the concentration of heavy metals of Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn, and the sources of pollution in water and sediment of the Upper Litani River Basin (ULRB) in Lebanon. The investigation was performed during three seasons of rainy, mid-rainy spring and wet periods for two years during different flow rates. Sediments were characterized by a set of chemical analyses, cation exchange capacity (CEC), mineralogy of the sediments, X-ray diffraction (XRD), and Fourier transformed infrared spectroscopy (FTIR). To assess metal contamination in sediment, Consensus-Based Sediment Quality Guidelines of Wisconsin (CBSQG) were applied. The metals contamination in the sediments was also evaluated by contamination factor (Cf). The test results showed that the effect of seasonal variations was significant in the Upper Litani River Basin. Principal Compound Analysis (PCA) and Pearson’s correlation were also performed in this study to compare and determine the correlation between metals in water and sediments. The concentrations of Pb, Cd, Cu, Cr and Zn in all sediment samples are above the norms in winter, while Fe was increased in summer. The results showed that the importance of monitoring of changes of heavy metals values and physico-chemical characterization of different parameters could represent the possibility of a comprehensive assessment of negative pressures on the water and soil ecosystem of Litani River Basin during different seasons.
    • Haoyu Jin; Xiaohong Chen; Ruida Zhong; Yingjie Pan; Tongtiegang Zhao; Zhiyong Liu; Xinjun Tu
    • 摘要: The Jinsha River comprises the upper reaches of the Yangtze River,which is the river section with the highest sediment content.Monitoring of sediment transport in the Jinsha River is done to the guarantee for the normal operation of the Three Gorges Reservoir.In the current study,a copula function was used to do a joint probability analysis of the water and sediment in the Jinsha River Basin(JRB),further a sediment load prediction model based on the copula function also was constructed.The results show that the average annual flow from 2001 to 2018 at the outlet of the Jinsha River(Yibin station)is about60.43 billion m^(3),and the average annual sediment load is about 58.82 million t.The linear correlation coefficient between annual flow and annual sediment load is 0.28.The best marginal distribution for annual flow and sediment load is Pearson Type Three(PE3)and Generalized Normal(GNO),respectively,and the best fit for the combined distribution of the two variables is the Frank copula function.The synchronous probability of water and sediment occurrence is 0.459,and the asynchronous probability is0.541.Based on the copula prediction model,the sediment load can be effectively simulated,and the correlation coefficient between the simulated sequence and the measured sequence reached 0.93.The current study provides important significance for the analysis of water and sediment in the JRB,which is beneficial to the management of Three Gorges Reservoir sediment discharge in the upstream and downstream.
    • Zheng Li; Jie Zhou; Minzhi Gao; Wei Liang; Lu Dong
    • 摘要: Understanding speciation has long been a fundamental goal of evolutionary biology.It is widely accepted that speciation requires an interruption of gene flow to generate strong reproductive isolation between species.The mechanism of how speciation in sexually dichromatic species operates in the face of gene flow remains an open question.Two species in the genus Chrysolophus,the Golden Pheasant(C.pictus)and Lady Amherst’s Pheasant(C.amherstiae),both of which exhibit significant plumage dichromatism,are currently parapatric in southwestern China with several hybrid recordings in field.In this study,we estimated the pattern of gene flow during the speciation of the two pheasants using the Approximate Bayesian Computation(ABC)method based on data from multiple genes.Using a newly assembled de novo genome of Lady Amherst’s Pheasant and resequencing of widely distributed individuals,we reconstructed the demographic history of the two pheasants by the PSMC(pairwise sequentially Markovian coalescent)method.The results provide clear evidence that the gene flow between the two pheasants was consistent with the predictions of the isolation with migration model during divergence,indicating that there was long-term gene flow after the initial divergence(ca.2.2 million years ago).The data further support the occurrence of secondary contact between the parapatric populations since around 30 kya with recurrent gene flow to the present,a pattern that may have been induced by the population expansion of the Golden Pheasant in the late Pleistocene.The results of the study support the scenario of speciation between the Golden Pheasant and Lady Amherst’s Pheasant with cycles of mixing-isolation-mixing,possibly due to the dynamics of geographical context in the late Pleistocene.The two species provide a good research system as an evolutionary model for testing reinforcement selection in speciation.
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