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Clustering-based adaptive low-power subframe configuration with load-aware offsetting in dense heterogeneous networks

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Digital Communications and Networks 2022年第5期8卷 843-852页

作者： Dinkisa A.Bulti Jyri Hämäläinen Beneyam B.Haile Yihenew Wondie School of Electrical and Computer Engineering Addis Ababa Institute of Technology(AAiT)Ethiopia Department of Communication and Networking Aalto UniversityFinland

Heterogeneous Networks(HetNets)and cell densification represent promising solutions for the surging data traffic demand in wireless *** dense HetNets,user traffic is steered toward the low-Power Node(lPN)when possible to enhance the user throughput and system capacity by increasing the area spectral ***,because of the transmit power differences in different tiers of HetNets and irregular service demand,a load imbalance typically exists among different serving *** offload more traffic to lPNs and coordinate the Inter-Cell Interference(ICI),Third-Generation Partnership Project(3GPP)has facilitated the development of the Cell Range Expansion(CRE),enhanced Inter-Cell Interference Coordination(eICIC)and Further enhanced ICIC(FeICIC).In this paper,we develop a cell clustering-based load-aware offsetting and an adaptive low-Power Subframe(lPS)*** solution allows the separation of User Association(UA)functions at the User Equipment(UE)and network server such that users can make a simple cell-selection decision similar to that in the maximum Received Signal Strength(max-RSS)based UA scheme,where the network server computes the load-aware offsetting and required lPS periods based on the load conditions of the *** proposed solution is evaluated using system-level simulations wherein the results correspond to performance changes in different service *** show that our method effectively solves the offloading and interference coordination problems in dense HetNets.

关键词： Heterogeneous networks(HetNets) 5G lTE-AUser association Interference coordination load balancing Cell range expansion Almost blank subframe Further enhanced ICIC low-power subframe

Comparison of a Full Second-Order Moment Model and an Algebraic Stress Two-Phase Turbulence Model for Simulating Bubble-liquid Flows in a Bubble Column

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Chinese Journal of Chemical Engineering 2002年第2期10卷 142-148页

作者：周力行杨玟廉春英 l.S.Fan D.J.lee Department of Engineering Mechanics Tsinghua University Beijing 100084 China Department of Chemical Engineering The Ohio State University USA

A full second-order moment (FSM) model and an algebraic stress (ASM) two-phase turbulence modelare proposed and applied to predict turbulent bubble-liquid flows in a 2D rectangular bubble column. Predictiongives the bubble and liquid velocities, bubble volume fraction, bubble and liquid Reynolds stresses and bubble-liquidvelocity correlation. For predicted two-phase velocities and bubble volume fraction there is only slight differencebetween these two models, and the simulation results using both two models are in good agreement with the particleimage velocimetry (PIV) measurements. Although the predicted two-phase Reynolds stresses using the FSM are insomewhat better agreement with the PIV measurements than those predicted using the ASM, the Reynolds stressespredicted using both two models are in general agreement with the experiments. Therefore, it is suggested to usethe ASM two-phase turbulence model in engineering application for saving the computation time.

关键词： second-order moment model two-phase turbulence bubble-liquid flow bubble column

Triclosan toxicity in a model cyanobacterium (Anabaena flos-aquae): Growth, photosynthesis and transcriptomic response

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Journal of Environmental Sciences 2023年第5期127卷 82-90页

作者： Jiezhang Mo linrong Han Runnan lv Michael W.l.Chiang Rong Fan Jiahua Guo Shaanxi Key laboratory of Earth Surface System and Environmental Carrying Capacity College of Urban and Environmental SciencesNorthwest UniversityXi’an 710127China State Key laboratory of Marine Pollution and Department of Chemistry City University of Hong KongKowloonHong Kong SARChina

Exposure to triclosan(TCS)has been reported to reduce photosynthetic pigments,suppress photosynthesis,and inhibit growth in both prokaryotic and eukaryotic algae including Anabaena flos-aquae(a model cyanobacterium).In particular,cyanobacteria are more sensitive to TCS toxicity compared to eukaryotic algae possibly due to the structural similarity to bacteria(target organisms);however,whether TCS exerts its toxicity to cyanobacteria by targeting signaling pathways of fatty acid biosynthesis as in bacteria remains virtually unknown,particularly at environmental exposure *** the complete genome sequence of ***-aquae presented in this study,the transcriptomic alterations and potential toxic mechanisms in ***-aquae under TCS stress were *** growth,pigments and photosynthetic activity of ***-aquae were markedly suppressed following a 7-day TCS exposure at 0.5μg/l but not 0.1μg/l(both concentrations applied are environmentally relevant).The transcriptomic sequencing analysis showed that signaling pathways,such as biofilm formation–Pseudomonas aeruginosa,two-component system,starch and sucrose metabolism,and photosynthesis were closely related to the TCS-induced growth inhibition in the 0.5μg/l TCS *** systems and potentially two-component system were identified to be sensitive targets of TCS toxicity in *** present study provides novel insights on TCS toxicity at the transcriptomic level in ***-aquae.

关键词： Genome Transcriptome Photosynthesis inhibition Two-component system Antimicrobial toxicity

A solution to the hydrodynamic lubrication of a circular point contact sliding over a flat surface with cavitation

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Theoretical & Applied Mechanics letters 2012年第3期2卷 62-64页

作者： Hans B.lfgren Functional Surfaces Research Group School of Business and EngineeringUniversity of HalmstadP.O.Box 823SE-301 18 HalmstadSweden

This letter presents an analytical solution to the hydrodynamic lubrication of a circular point contact sliding over a flat surface with *** solution is found by solving the Reynolds equation with Reynolds boundary condition for *** cavitation boundary is shown to be straight lines directed 108.4°against the sliding *** result is experimentally verified in the limit of large values of viscosity,sliding velocity and radius of a spherical *** solution raises questions about the coupling between cavitation and film rupture and can be used as an independent check on the validity of numerical solutions.

关键词： Reynolds equation analytical solution cavitation point contact

Anthracene Removal and Mineral N Dynamics in a Surfactant-Amended Soil

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Pedosphere 2014年第6期24卷 783-790页

作者： M.R.CRDENAS-AQUINO G.SAlOMóN-HERNNDEZ .AGUIlAR-CHVEZ M.l.lUNA-GUIDO R.MARSCH l.DENDOOVEN laboratory of Soil Ecology Department of Biotechnology and BioengineeringCinvestavMexico D.F.C.P.07360 (Mexico)

Surfactants, such as non-ionic Surfynol 485 （ethoxylated 2,4,7,9-tetramethyl-5-decyne-4,7-diol）, have been applied to accelerate removal of polycyclic aromatic hydrocarbons from soil. This study investigated the dissipation of anthracene, and carbon （C） and nitrogen （N） mineralization in soil amended with non-ionic Surfynol 485 at different rates. Soil samples of a Typic Fragiudept taken from Otumba, Mexico were spiked with anthracene at a final concentration of 520 mg kg^-1 dry soil using acetone as solvent, amended with 0.0, 24.9, 49.8 or 124.4 g kg^-1 soil of the surfactant and incubated in the laboratory. The soil not amended with anthracene, acetone and the surfactant was used as a control. Dynamics of C and N and the concentration of anthracene were monitored for 56 d. After 56 d of incubation, 38% of the anthracene was removed from the unamended soil, and 47%, 55% and 66% of the anthracene were removed when 24.9, 49.8 and 124.4 g kg^-1 of the surfactant were applied, respectively. Application of acetone, anthracene or surfactant increased the emission of CO2, but decreased the mineral N compared to the unamended control. Applying the surfactant to the acetone or anthracene-amended soil reduced emission of CO2, but increased the mineral N at the lower application rates of the surfactant. It was found that the application of the non-ionic surfactant increased the bioavailability of anthracene and thus its removal from soil, increased C mineralization, but decreased N miaeralization. Consequently, the application of non-ionic surfactant could be easily used to accelerate the removal of pollutants from hydrocarbon-contaminated soils, but mineral N in the soil would decrease, which might inhibit plant growth.

关键词： acetone anthracene bioavailability C mineralization CO2 emission non-ionic surfactant Surfynol 485 polycyclic aromatic hydrocarbons

The electrical switching characteristics of single copper tetra-cyanoquinodimethane nanowire

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Nano-Micro letters 2009年第1期1卷 23-26页

作者： K.B.Zheng H.T.Shen C.N.Ye J.l.li D.l.Sun G.R.Chen Department of Materials Science Fudan University Department of Materials Science and Engineering Soochow University

In this paper, method combined vapor transportation with in-situ chemical reaction is employed to synthesize Cu(TCNQ) nanowires. The typical diameter of nanowires is 50-500 nm with high uniformity. The electrical switching characteristics of single nanowire are observed. The ON-OFF resistance ratio for switching reaches 10~4. The investigation reveals a linear relationship between the switching threshold and the spacing between the two electrodes. The temporal response of the switching process is 30 ns and the switch exhibits good reproducibility. The collapse of the nanowire under the condition of current surge is also discussed. It is believed that the Cu(TCNQ) nanowire could be promising for applications in nanoelectronics.

关键词： Cu(TCNQ) Nanowire Electrical switching Charge transfer Complexes

light hydrocarbon in ore-forming fluids and its constraints on ore genesis——A case study on Changkeng large-scale Au-Ag deposit, central Guangdong, China

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Chinese Science Bulletin 1999年第S2期44卷 58-61页

作者： D. l. Norman Department of Earth & Environmental Sciences New Mexico Institute of Mining & Technology (NMT) Socorro NM87801 USA

ORGANIC matters in the ore-forming fluids are composed mainly of light hydrocarbons. Because of the small amount of hydrocarbons in fluid inclusions, it is quite difficult to study their behavior in mineralizing processes, excepting methane （CH4）. In this work, we used a high vacuum quadrupole gas massspectrometer system to determine the content and composition of light hydrocarbons (C1-7) in fluid inclusions in minerals collected from Changkeng Au-Ag deposit. The geological significance of the new data forgenesis of the deposit has been discussed briefly.

关键词： light hydrocarbons ore-forming fluid ore genesis Changkeng Au-Ag deposit.

Synthesis and characterization of carbon-TiO2-CeO2 composites and their applications in phenol degradation

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Journal of Rare Earths 2017年第6期35卷 551-558页

作者： Y.lara-lópez G.García-Rosales J.Jiménez-Becerril Technological Institute of Toluca Posgrade and Research Division Ex-Rancho La Virgen S/N C.P. 50120 Metepec Mexico National Institute for NuclearResearch Chemistry Department. Carretera Mexico-Toluca S/N la Marquesa Ocoyoacac C.P. 52750 Mexico

The objective of this work was to synthesize particles of titanium oxide and cerium oxide supported on carbon, which was obtained through the pyrolysis of orange peel. The materials were characterized using scanning electron microscopy, X-ray diffraction, infrared spectroscopy, and the specific surface area from Brunauer-Emmett-Teller method. The photocatalytic properties of the synthesized materials were determined by the degradation of phenol in 30 mg/l aqueous solutions. TiO2-CeO2 particles were obtained with an average spherical size of 57 nm and were supported on the carbon surface; this material presented a specific surface area of 296 m2/g and degrades -40% of phenol after 240 min of UV irradiation.

关键词： phenol photocatalytic spherical pyrolysis irradiation Teller Brunauer ceria orange cerium

Algorithm Validation of the Current Profile Reconstruction of EAST Based on Polarimeter/Interferometer

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Plasma Science and Technology 2015年第1期17卷 75-79页

作者：钱金平 l.l.lAO 任启龙万宝年刘海庆曾龙罗正平 K.HANADA 陈大龙石同辉孙有文沈飙肖炳甲 Institute of Plasma Physics Chinese Academy of Sciences General Atomics Kuyushu University

The method of plasma current profile reconstruction using the polarimeter/interferometer（POINT） data from a simulated equilibrium is explored and *** is shown that the safety factor（q） profile can be generally reconstructed from the external magnetic and POINT *** reconstructed q profile is found to reasonably agree with the initial *** of reconstructed q and density profiles using the magnetic data and the POINT data with 3%,5%and 10%random errors are *** result shows that the POINT data could be used to a reasonably accurate determination of the q profile.

关键词： plasma equilibrium current profile polarimeter/interferometer