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Neutropenia:diagnosis and management

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World Journal of Pediatrics 2022年第11期18卷 771-777页

作者： Jing Zhang xiao-yan wu Run-Ming Jin Department of Pediatrics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China

Neutropenia is definedas an absolute neutrophil count(ANC)of less than 1500/μ*** to the number of circulating neutrophils,neutropenia is divided into mild(1000/μL≤ANC<1500/μL),mode rate(500/μL≤ANC<1000/μL),and ... 详细信息

关键词： diagnosis absolute neutrophil

Approximation by random weighting method for M-test in linear models

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Science China Mathematics 2007年第1期50卷 87-99页

作者： xiao-yan wu Ya-ning yanG Lin-cheng ZHAO Department of Statistics and Finance University of Science and Technology of ChinaHefei 230026China

The M-test has been in common use and widely studied in testing the linear hypotheses in linear models. However, the critical value for the test is usually related to the quantities of the unknown error distribution and the estimate of the nuisance parameters may be rather involved, not only for the M-test method but also for the existing bootstrap methods. In this paper we suggest a random weighting resampling method for approximating the null distribution of the M-test statistic. It is shown that, under both the null and the local alternatives, the random weighting statistic has the same asymptotic distribution as the null distribution of the M-test. The critical values of the M-test can therefore be obtained by the random weighting method without estimating the nuisance parameters. A distinguished feature of the proposed method is that the approximation is valid even the null hypothesis is not true and the power evaluation is possible under the local alternatives.

关键词： M-test linear model local alternative random weighting power calculation 62J05

File format for storage of scalable video

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第5期7卷 706-712页

作者： BAI Gang SUN xiao-yan wu Feng YIN Bao-cai LI Shi-peng Beijing Municipal Multimedia and Intelligent Software Key Laboratory Beijing University of Technology Beijing 100022 China Microsoft Research Asia Beijing 100086 China Microsoft Research Asia Beijing 100086 China Beijing Municipal Multimedia and Intelligent Software Key Laboratory Beijing University of Technology Beijing 100022 China Microsoft Research Asia Beijing 100086 China

A file format for storage of scalable video is proposed. A generic model is presented to enable a codec independent description of scalable video stream. The relationships, especially the dependencies, among sub-streams in a scalable video stream are specified sufficiently and effectively in the proposed model. Complying with the presented scalable video stream model, the file format for scalable video is proposed based on ISO Base Media File Format, which is simple and flexible enough to address the demands of scalable video application as well as the non-scalable ones.

关键词： Codes (standards) Data structures Digital storage Internet Mathematical models Multimedia systems

Effect of La addition on microstructure and mechanical properties of hypoeutectic Al-7Si aluminum alloy

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China Foundry 2021年第5期18卷 481-487页

作者： xiao-yan wu Wei Luo Hua-rui Zhang Hu Zhang Hai-tao Jiang National Engineering Research Center for Advanced Rolling Technology University of Science and Technology BeijingBeijing 10083China School of Materials Science and Engineering Beihang UniversityBeijing 100191China

The effect of La addition(0,0.1,0.2,0.4,wt.%)on the microstructure,tensile properties and fracture behavior of Al-7Si alloy was investigated *** is found that the La appears in the Al-7Si alloy in the form of Al4La and Al2Si2La *** addition can refine the secondary dendrite arm spacing(SDAS)and eutectic Si particles,which are decreased by 7.9%and 7%,respectively,with the optimal La content of 0.1wt.%.Because when 0.1wt.%La is added,a relatively higher nucleation undercooling of 37.47℃ is *** undercooling degree suggests that nucleation is accelerated and subsequent growth is *** T6 heat treatment,compared with the without La,the ultimate tensile strength of the alloy with 0.1wt.%La is enhanced by 5.2%from 333 MPa to 350.2 MPa and the elongation increases by 73%from 7.37%to 12.75%,*** fracture mode evolves from the ductile-brittle mixed fracture to ductile fracture ***,when La element content reaches a certain value of 0.4wt.%,serious segregation takes place during the solidification *** formed brittle phases deteriorate the tensile properties of the alloy and the fracture mode of Al-7Si-0.2/0.4 La changes to mixed ductile-brittle fracture mode.

关键词： La addition Al-7Si alloy microstructure mechanical property

Factors influencing the aggregation behavior of residual associative polymer in produced oily fluids

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Petroleum Science 2017年第1期14卷 195-202页

作者： Shi-Jia Chen Bin Chen Hong-Qing Zhu Cheng-Sheng Wang xiao-yan wu Peng Lv CNOOC EnerTech-Drilling and Production Co. Tianjin 300452China State Key Laboratory of Offshore Oilfield Exploitation Tianjin 300452China

The influence of emulsified oil, suspended solids, Fe3＋, Fe2＋, cationic water clarifier and sulfate-reducing （SR） bacteria on the aggregation behavior of residual hydrophobic modified polyacrylamide in treated oily wastewater from polymer flooding was studied by fluorescence spectroscopy and dynamic light scattering. The result of I1/I3 showed that the polarity of hydrophobic microdomains increased, whereas the size of the hydrophobic microdomains may be decreased, where the value of I1/I3 represents the ratio of the intensity of peak 11 （374.0 nm） to that of peak/3 （385.0 nm） of the vibration fine structure of pyrene monomer emission in residual polymer solution. The results of the ratio of I1 at 48 h to I1 at 0 h （I1,48h/I1,0h） indicated that oil and cationic water clarifier could inhibit the aggregation to some extent, while Fe2＋ and suspended solids were helpful for aggregation, and Fe3＋ and SR bacteria had no significant influence on the aggregation of polymer.

关键词： Aggregation behavior Fluorescencespectrum Residual polymer in treated water Hydrophobic modified polyacrylamide

Evolution of microstructure and mechanical properties of A356 aluminium alloy processed by hot spinning process

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China Foundry 2017年第2期14卷 138-144页

作者： xiao-yan wu Hua-rui Zhang Huan-liang Chen Li-na Jia Hu Zhang School of Materials Science and Engineering Beihang University Beijing 100191 China Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology Beihang University Beijing 100191 China

The evolution of microstructure and mechanical properties of A356 aluminum alloy subjected to hot spinning process has been investigated. The results indicated that the deformation process homogenized microstructure and improved mechanical properties of the A356 aluminum alloy. During the hot spinning process, eutectic Si particles and Fe-rich phases were fragmented, and porosities were eliminated. In addition, recrystallization of Al matrix and precipitation of Al Si Ti phases occurred. The mechanical property testing results indicated that there was a significant increase of ductility and a decrease of average microhardness in deformed alloy over die-cast alloy. This is attributed to uniform distribution of finer spherical eutectic Si particles, the elimination of casting defects and to the recrystallized finer grain structure.

关键词： hot spinning process A356 aluminum alloy microstructure mechanical properties

Multi-endpoint assays reveal more severe toxicity induced by chloraminated effluent organic matter than chloraminated natural organic matter

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Journal of Environmental Sciences 2024年第1期135卷 310-317页

作者： Hai-yan Wang De-Xiu wu Ye Du xiao-Tong Lv Qian-Yuan wu State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Environmental Protection Key Laboratory of Microorganism Application and Risk Control Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental SafetyTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China College of Architecture and Environment Sichuan UniversityChengdu 610000China

Disinfection by chloramination produces toxic byproducts and the difference in toxicity of reclaimed and drinking water treated by chloramination remains *** study investigated cytotoxic effects at the same concentrations of dissolved organic matter and showed that chloraminated effluent organic matter(EfOM)induced 1.7 times higher cytotoxicity than chloraminated natural organic matter(NOM)applied to simulate drinking *** EfOM induced more reactive nitrogen species than chloraminated NOM,and chloraminated EfOM and NOM induced similar and higher levels of reactive oxygen species than the negative control,***,intracellular macromolecule damage indicated by DNA/RNA damage marker 8–hydroxy-(deoxy)guanosine and the intracellular protein carbonyl concentration induced by chloraminated EfOM was higher and slightly more than that induced by chloraminated NOM,*** data were consistent with the effects on cell physiological *** cycle arrest mainly occurred in G2 phase by chloraminated EfOM and *** apoptotic cells,which could return to normal,increased upon exposure to high concentrations of chloraminated EfOM and ***,necrotic cells were significantly increased from 0.5%to 2.5%when the concentration increased from 20-to 60-fold chloraminated EfOM,but were not obviously changed by chloraminated *** results indicated that the comprehensive intracellular changes induced by toxic substances in chloraminated EfOM were more irreversible and induced more cell death than chloraminated NOM.

关键词： Cytotoxicity Intracellular active nitrogen/oxygen Intracellular oxidative damage Cell necrosis Reclaimed water

Injection of a Self-propelled Polymer into a Small Circular Cavity

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Chinese Journal of Polymer Science 2024年第6期42卷 886-894页

作者： Chao Wang yan-Li Zhou xiao yang Fan wu Meng-Bo Luo Department of Physics Taizhou UniversityTaizhou318000China Department of Physics Zhejiang UniversityHangzhou310027China

The injection of a polymer chain into a small circular cavity under tangential self-propelled force is studied by using Langevin dynamics *** indicate that the injection dynamics of the active polymer shows strong correlation with the polymer conformation inside the cavity depending on the polymer rigidity(k_(b)).The injection timeτvaries nonmonotonously with increasing k_(b),and reaches its minimum at k_(b)^(*).When k_(b) is small(k_(b)≪k_(b)^(*)),the polymer is nearly random coil in the cavity,and spends a long time at the final stage of the injection process due to the large repulsion between monomers inside the *** k_(b) is moderate(k_(b)∼k_(b)^(*)),the part of polymer inside the cavity forms spiral configuration under the tangential active force,and the whole polymer moves synchronously with a constant velocity during the injection process,leading to a small injection *** k_(b) is large(k_(b)≫k_(b)^(*)),the polymer is nearly straight at the initial stage of the injection process,and takes a long time to bend itself,leading to a large injection time.

关键词： Active Polymer Injection Dynamics Simulation

Six million Q factor micro fused silica shell resonator with teeth-like tines released by femtosecond laser-assisted chemical etching

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Science China(Technological Sciences) 2024年第6期67卷 1923-1932页

作者： ZHAO Tao SHI yan LU Kun XI Xiang wu XueZhong xiao DingBang College of Intelligence Science and Engineering National University of Defense TechnologyChangsha410073China

The quality factor(Q factor)is a crucial performance parameter for *** this paper,a novel release method for highquality micro fused silica shell resonators with teeth-like tines with good surface morphology is *** method is based on femtosecond laser-assisted chemical ***,the optimal energy range of femtosecond laser modification is obtained through mechanism ***,the optimal parameters for a straight line and arc pattern are determined by optimizing the average output power,processing speed,and processing *** results demonstrate why edge breakage in rounded corners is easy under different ***,according to these conclusions,the processing is performed on a micro fused silica shell resonator with a Q factor exceeding 6 *** addition,subsurface damage is rare throughout the fabrication process,and the surface roughness of the released cross section reaches the nanometer *** improved Q factor helps suppress mechanical thermal noise and reduce zero bias and zero bias drift,constituting the primary method for enhancing the performance of the resonant gyroscope.

关键词： micro hemispherical resonator fused silica laser-assisted chemical etching quality factor