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深圳市24家医院极/超早产儿产房过渡期管理的横断面调查

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中国当代儿科杂志 2024年第3期26卷 250-257页

作者：无吴本清杨传忠深圳新生儿数据协作网深圳市光明区人民医院深圳市妇幼保健院

目的了解深圳市极/超早产儿产房过渡期管理实施现状。方法2022年11月对深圳新生儿数据协作网的24家三级医院的极/超早产儿产房过渡期管理实施情况进行横断面调查,调查内容包括产前准备、产房复苏实施和新生儿重症监护室复苏后管理。根... 详细信息

目的了解深圳市极/超早产儿产房过渡期管理实施现状。方法2022年11月对深圳新生儿数据协作网的24家三级医院的极/超早产儿产房过渡期管理实施情况进行横断面调查,调查内容包括产前准备、产房复苏实施和新生儿重症监护室复苏后管理。根据胎龄将所纳入早产儿分为4组:<26周、26~28^(+6)周、29~30^(+6)周和31~31^(+6)周组,对结果进行描述性分析。结果共纳入140例极/超早产儿,其中<26周组10例,26~28^(+6)周组45例,29~30^(+6)周组49例,31~31^(+6)周组36例。140例极/超早产儿中,99例(70.7%)接受了产前咨询,提供产前咨询的人员以产科医生为主,占比为79.8%;产时参与复苏的人员主要为助产士(96.4%)和新生儿科住院医师(62.1%);52例(37.1%)实施了延迟脐带结扎,平均延迟时间为(45±17)s;137例(97.9%)生后采用了预热辐射台保暖;110例(78.6%)需要正压通气,其中67例(60.9%)采用T组合复苏器,42例(38.2%)应用了空氧混合仪;119例(85.0%)复苏中进行了血氧饱和度监测;完成过渡期各项措施至关闭温箱门时间的中位数为87min。结论在深圳新生儿数据协作网医院中,极/超早产儿的产房过渡期管理实施与我国相应专家共识的要求存在不同程度的差异,需要通过多中心协作的持续质量改进缩小差距,从而改善极/超早产儿产房过渡期管理的质量和结局。

关键词：过渡期管理横断面调查深圳极早产儿超早产儿

Synthesis of Polynorbornene-Poly(ethylene-co-propylene)Diblock Copolymer

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Chinese Chemical Letters 1998年第5期9卷 447-450页

作者： wu, q Wen, q Lu, ZJ Zhongshan Univ Inst Polymer Sci Canton 510275 Peoples R China

Transformation of living ring-opening metathesis polymerization into coordination polymerization by converting the titanacyclobutane group attached to a polynorbornene chain into titanocene alkoxide has been used for the synthesis of polynorbornene-poly(ethylene-co-propylene) block copolymer. Preliminary characterizations of the copolymerization products by solvent extraction and C-13 NMR spectrum are reported.

关键词： ring-opening metathesis polymerization coordination polymerization diblock copolymer norbornene ethylene propylene

Universal basis underlying temperature, pressure and size induced dynamical evolution in metallic glass-forming liquids

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Chinese Physics B 2024年第1期33卷 134-142页

作者：张华平范蓓蓓吴佳琦李茂枝 Department of Physics Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano DevicesRenmin University of ChinaBeijing 100872China Songshan Lake Materials Laboratory Dongguan 523808China Key Laboratory of quantum State Construction and Manipulation Renmin University of ChinaBeijing 100872China

The dramatic temperature-dependence of liquids dynamics has attracted considerable scientific interests and efforts in the past decades, but the physics of which remains elusive. In addition to temperature, some other parameters, such as pressure, loading and size, can also tune the liquid dynamics and induce glass transition, which makes the situation more complicated. Here, we performed molecular dynamics simulations for Ni_(50)Zr_(50) bulk liquid and nanodroplet to study the dynamics evolution in the complex multivariate phase space, especially along the isotherm with the change of pressure or droplet size. It is found that the short-time Debye–Waller factor universally determines the long-time relaxation dynamics no matter how the temperature, pressure or size changes. The basic correlation even holds at the local atomic scale. This finding provides general understanding of the microscopic mechanism of dynamic arrest and dynamic heterogeneity.

关键词： metallic glass-forming liquids structure relaxation dynamical heterogeneity Debye–Waller factor

Stability and local bifurcation of parameter-excited vibration of pipes conveying pulsating fluid under thermal loading

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Applied Mathematics and Mechanics(English Edition) 2015年第8期36卷 1017-1032页

作者： Demin ZHAO Jianlin LIU C.q.wu Department of Mechanics College of Pipeline and Civil Engineering China University of Petroleum Department of Mechanical and Manufacturing Engineering University of Manitoba

The parametric excited vibration of a pipe under thermal loading may occur because the fluid is often transported heatedly. The effects of thermal loading on the pipe stability and local bifurcations have rarely been studied. The stability and the local bifurcations of the lateral parametric resonance of the pipe induced by the pulsating fluid velocity and the thermal loading are studied. A mathematical model for a simply supported pipe is developed according to the Hamilton principle. Two partial differential equations describing the lateral and longitudinal vibration are obtained. The singularity theory is utilized to anMyze the stability and the bifurcation of the system solutions. The transition sets and the bifurcation diagrams are obtained both in the unfolding parameter space and the physical parameter space, which can reveal the relationship between the thermal field parameter and the dynamic behaviors of the pipe. The frequency response and the relationship between the critical thermal rate and the pulsating fluid velocity are obtained. The numerical results demonstrate the accuracy of the single-mode expansion of the solution and the stability and local bifurcation analyses. It also confirms the existence of the chaos. The presented work can provide valuable information for the design of the pipeline and the controllers to prevent the structural instability.

关键词： thermal load parameter excited local bifurcation,unfolding parameterspace physical parameter space

Chain-to-Chain Competition Under Demand Uncertainty

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Journal of the Operations Research Society of China 2016年第1期4卷 49-75页

作者： Owen q.wu Hong Chen Kelley School of Business Indiana UniversityBloomingtonINUSA Shanghai Advanced Institute of Finance Shanghai 200030China

In this paper,we aim to study the structure choice of supply chains under competitive environment with uncertain *** consider two competing supply chains,each of which chooses to either vertically integrate or decentralize with coordinating *** first analyze firms’strategic behavior under given supply chain structures:two integrated chains(II),two decentralized chains(DD),and a mixed structure with one decentralized chain and one integrated *** then compare different supply chain structures and examine the equilibrium structure *** find that the equilibrium structure depends on the product *** substitutable products,DD is the equilibrium supply chain structure choice,whereas for complementary products,II is the equilibrium ***,a high demand uncertainty strengthens these equilibrium choices.

关键词： coordination Chain-to-chain competition Demand unce

Emissivity Calculations Under DCA-UTA Approximation for NLTE Plasmas

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Communications in Computational Physics 2007年第6期2卷 1085-1094页

作者： J.q.Pang Z.q.wu J.Yan Institute of Applied Physics and Computational Mathematics Laboratory of Computational PhysicsP.O.Box 8009-57Beijing 100088China.

A model is developed to calculate emission spectrum from plasmas in nonlocal-thermodynamic-equilibrium(NLTE).The populations are obtained with a Collisional Radiative Model and the spectrum is calculated with the Unresolved-TransitionArray(UTA)*** present model is applied to the calculation of emissivity from low-,medium-and high-Z *** integrated emissivity and the spectra are compared with those calculated by other theoretical *** general speaking,the present results of the mean charge state and emissivity agree well with some theoretical ones while large differences are found when all the theoretical results are included.

关键词： Non-local-thermodynamic-equilibrium(NLTE) emissivity Unresolved-TransitionArray(UTA).

Simulation Analysis of Deformation Control for Magnetic Soft Medical Robots

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Effect of Solid/Liquid Interface Morphology on Microstructure and Segregation of DSX40M Superalloy

自动化学报（英文版） 2024年第3期

作者： Jingxi Wang Baoyu Liu Edmond q.wu Jin Ma Ping Li

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Journal of Materials Science & Technology 1995年第1期11卷 56-60页

作者： SUN, LL wu, q ZHANG, ZY HU, ZG

The effect of solid/liquid interface morphologies on the microstructure and segregation of a new type superalloy, DSX40M, was studied. It has been found that the primary arm spacing presents maximum value as the solid/liquid interface shape transforms from cellular to cellular-dendritic. As the alloy solidifies with a coarse dendritic interface, the solute segregation degree and the average size of the carbide reach the maximum values because of the widest mushy zone. A Zr-rich phase forms at this range. Within the solidification rate range of dendritic interface, the primary dendritic arm spacing and solute segregation decrease with the increasing of solidification rate and the Zr-rich phase disappears. It should be indicated that the change of the solid/liquid interface does not vary the carbide type, but greatly affects the average size of the carbides. The quantitative results of the carbide size change in this alloy system with different solid/liquid interfaces is presented.

关键词： Effect of Solid/Liquid Interface Morphology on Microstructure and Segregation of DSX40M Superalloy

Hydrogen Permeation and Diffusion in Amorphous Alloy Ni_(68)Cr7_Si_8B_(14)Fe_3 at Elevated Temperature

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Journal of Materials Science & Technology 1997年第5期13卷 443-445页

作者： wu q. Xu J. Sun X. Hu Z. National Key Lab. for RSA Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The behaviour of hydrogen permeation and diffusion in amorphous alloy Ni68Cr7Si8B14Fe3 hasbeen investigated by an ultrahigh vacuum gas permeation technique. A comparison experimentwas carried out between the as-quenched and annealed States (400℃/2h) of the amorphousalloy. The results show that, for both states of the amorphous alloy in the temperature rangeof 200～350℃, the diffusivity and permeability of hydrogen are in agreement with Arrheniusrelationship, there does not exist H-trapping effect, and the activation energies of diffusion andpermeation almost keep the same.

关键词： Fe3 at Elevated Temperature Si Cr7Si8B Hydrogen Permeation and Diffusion in Amorphous Alloy Ni