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基于加速康复外科理念的集束化护理模式对游离穿支皮瓣修复上肢创面患者疾病预后的影响

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中国医疗美容 2024年第3期14卷 81-86页

作者：赵磊余秀菊杨萃南阳市中心医院骨科河南南阳473000

目的研究基于加速康复外科理念的集束化护理模式对游离穿支皮瓣修复上肢创面患者疾病预后的影响。方法回顾性分析2020年3月~2022年11月于南阳市中心医院骨科接受游离穿支皮瓣修复上肢创面患者48例。根据入院时间不同分为对照组和试验组... 详细信息

目的研究基于加速康复外科理念的集束化护理模式对游离穿支皮瓣修复上肢创面患者疾病预后的影响。方法回顾性分析2020年3月~2022年11月于南阳市中心医院骨科接受游离穿支皮瓣修复上肢创面患者48例。根据入院时间不同分为对照组和试验组,对照组(24例)入院时间为2020年3月~2021年6月采用常规护理,试验组(24例)入院时间为2021年7月~2022年11月采用加速康复外科理念的集束化护理。分析两组患者术后创面愈合时间、住院时间、疼痛程度、修复效果、术后并发症、患者满意度。结果试验组患者创面愈合时间和住院时间、术后6h、24h、36h、72hNRS得分、术后1月VSS总分及各项评分以及术后并发症发生率均低于对照组,试验组患者满意度高于对照组,差异有统计学意义(P﹤0.05)。结论在游离穿支皮瓣修复上肢创面患者应用基于加速康复外科理念的集束化护理模式可以缩短患者术后创面愈合时间和住院时间、缓解疼痛程度、提高修复效果和患者满意度、降低术后并发症。

关键词：加速康复外科集束化护理游离穿支皮瓣修复上肢创面

未来变化环境下大汶河流域济南段生态流量评价

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中国农村水利水电 2024年第6期 124-131,139页

作者：侯恩光冯平孙影林庆辉褚伟谭秀翠济南市水文中心山东济南250002 山东农业大学山东泰安271018

生态流量是河流生态系统健康稳定的基础,在全球气候变化和人类活动增强的背景下,生态流量受到的影响日益显著。为探究大汶河流域生态流量对未来变化环境的响应,以大汶河流域济南段为研究对象,采用SWAT模型分析未来土地利用和气候情景下... 详细信息

生态流量是河流生态系统健康稳定的基础,在全球气候变化和人类活动增强的背景下,生态流量受到的影响日益显著。为探究大汶河流域生态流量对未来变化环境的响应,以大汶河流域济南段为研究对象,采用SWAT模型分析未来土地利用和气候情景下径流时空变化规律,评价大汶河水资源调度控制断面陈北、马小庄生态流量保证率,探究其对未来变化环境的响应规律。结果表明:未来变化环境下,大汶河流域济南段土地利用呈现耕地面积减小,城镇面积增大的特点;气候变化呈现降水量增多,温度上升的特点。未来土地利用变化引起径流减少2%,未来气候影响径流减少1%~4%,而两者共同作用,径流减少3%~5%,未来气候变化减弱了降水与径流的相关性。空间上,未来土地利用变化增强径流量空间正相关性,而未来气候变化减弱了径流量的空间正相关性及其显著性水平,且影响径流量空间分布特征。未来土地利用变化对陈北、马小庄流量及生态流量保证率影响较小,而未来气候变化改变了陈北、马小庄流量过程线的形态,将陈北、马小庄生态流量保证率由73%、74%提高到97%、98%,基本生态流量保证率90%以上占比由14%提高至93%。未来土地利用与气候因素中,降水量是陈北、马小庄生态流量保证率的主控因子。研究结果可为大汶河流域生态调度与管理,应对变化环境提供技术支持。

关键词：土地利用变化气候变化生态流量 SWAT 全局莫兰指数

Dynamic Asset Allocation with Loss Aversion in a jump-diffusion Model

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Acta Mathematicae Applicatae Sinica 2015年第2期31卷 557-566页

作者： Hui MI xiu-chun BI Shu-guang ZHANG School of Mathematical Sciences and Institute of Finance and Statistics Nanjing Normal University Department of Statistics and Finance University of Science and Technology of China

This paper investigates a dynamic asset allocation problem for loss-averse investors in a jumpdiffusion model where there are a riskless asset and N risky assets. Specifically, the prices of risky assets are governed by jump-diffusion processes driven by an m-dimensional Brownian motion and a（N- m）-dimensional Poisson process. After converting the dynamic optimal portfolio problem to a static optimization problem in the terminal wealth, the optimal terminal wealth is first solved. Then the optimal wealth process and investment strategy are derived by using the martingale representation approach. The closed-form solutions for them are finally given in a special example.

关键词： jump-diffusion process loss aversion asset allocation martingale

Parameter Estimation for the Discretely Observed Vasicek Model with Small Fractional Lévy Noise

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Acta Mathematica Sinica,English Series 2020年第4期36卷 443-461页

作者： guang jun SHEN Qing Bo WANG xiu Wei YIN Department of Mathematics Anhui Normal UniversityWuhu 241000P.R.China

The statistical inference of the Vasicek model driven by small Levy process has a long *** this paper,we consider the problem of parameter estimation for Vasicek model dX_t=(μ-θX_t)dt+εdL_t^d,t∈[0,1],X_0=x_0,driven by small fractional Lévy noise with the known parameter d less than one half,based on discrete high-frequency observations at regularly spaced time points{t_i=i/n,i=1,2,...,n}.For the general case and the null recurrent case,the consistency as well as the asymptotic behavior of least squares estimation of unknown parametersμandθhave been established as small dispersion coefficientε→0 and large sample size n→∞simultaneously.

关键词： Ornstein–Uhlenbeck process fraction Lévy processes least squares estimator consistency asymptotic distribution

Analytical solution for earthquake induced hydrodynamic pressure on a circular cylinder in a two-layer fluid

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Journal of Hydrodynamics 2020年第5期32卷 901-913页

作者： Pi-guang Wang Mi Zhao xiu-li Du Jing-bo Liu Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100124China College of Architecture and Civil Engineering Beijing University of TechnologyBeijing 1000124China Department of Civil Engineering Tsinghua UniversityBeijing 100084China

The analytical method is adopted to investigate the earthquake-induced hydrodynamic pressure on a circular cylinder surrounded by a two-layer *** on the radiation theory,the analytical expressions of the hydrodynamic pressure and the hydrodynamic force on a rigid circular cylinder are ***,the dispersion relation for the radiation problem in a two-layer fluid,and the added mass and the damping coefficients on the circular cylinder are *** earthquake-induced hydrodynamic forces on the circular cylinder in a two-layer fluid are furtherly *** is founded that the hydrodynamic pressures on the circular cylinder include not only the surface-wave and perturbing wave modes,but also the internal-wave *** is quite different from the case in a single-layer ***,the results indicate that the internal-wave mode has little influence on the hydrodynamic forces on the circular cylinder in a two-layer ***,the seismic responses of the flexible cylinder in single-layer and two-layer fluids are *** examples show that the seismic responses of the cylinder in a two-layer fluid are much larger than those in a single-layer fluid.

关键词： Circular cylinder earthquake hydrodynamic force surface wave two-layer fluid

ANALYSIS OF SOLUBLE CHEMICAL TRANSFER BY RUNOFF WATER IN FIELD

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Journal of Hydrodynamics 2008年第3期20卷 382-390页

作者： TONG ju-xiu YANG Jin-zhong State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan430072 China

In order to determine the main factors influencing soluble chemical transfer and corresponding techniques for reducing fertilizer loss caused by runoff in irrigated fields, a physically based two-layer model was developed with incomplete mixing theory. Different forms of incomplete mixing parameters were introduced in the model, which was successfully verified with previous published experimental data. According to comparison, the chemicals loss of fertilizer is very sensitive to the runoff-related parameter while it is not sensitive to the infiltration-related parameter. The calculated results show that the chemicals in infiltration water play an important role in the early time of rainfall even with saturated soil, and it is mainly in the runoff flow in the late rainfall. Therefore, prevention of shallow subsurface drainage in the early rainfall is an effective way to reduce fertilizer loss, and the coverage on soil surface is another effective way.

关键词： soluble chemical transfer runoff incomplete mixing sensitive infiltration

HYDRODYNAMIC CHARACTERISTICS AND SEISMIC ANALYSIS OF OFFSHORE CYLINDRICAL STRUCTURE-FLUID-SOIL SYSTEMS

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Journal of Hydrodynamics 1991年第3期3卷 79-87页

作者： Jia-ju, Bi Hong, Zhuang xiu-ling, Weng Tongi Univ Shangkai China

An analytical method is developed to solve the coupled vibration problem of a vertical elastic circular cylindrical structure founded on homogeneous elastic soil with surrounding fluid. An improved mathematical model is adopted by which not only the structure-fluid interaction but also the influence of soil are considered. The frequency-dependent radiation added mass and hydrodynamic radiation damping are expressed in closed form, and are compared with generalized mass and damping respectively. Their variations with the exciting frequency are studied as well. A discussion of the influences of structure fluid interaction and structure-soil interaction upon hydrodynamic loading is given.

关键词： Computers Applications Fluid Mechanics Foundations Soil Structure Interaction Hydrodynamics Mathematical Models

Crystal structure of β-cyclodextrin-4-chlorobenzoic acid complex:Unusual C-Cl…π interaction between 4-chlorobenzoic acids in β-cyclodextrin dimer

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Chinese Chemical Letters 2011年第7期22卷 847-850页

作者： En ju Wang guang Ying Chen Hainan Provincial Key Laboratory of Tropical Pharmaceutical Herb Chemistry School of Chemistry & Chemical Engineering Hainan Normal University Haikou 571158 China

The inclusion complex of β-cyclodextrin （β-CD） with 4-chlorobenzoic acid was synthesized and its crystal structure was determined by single crystal X-ray diffraction under cryogenic condition. The complex contains two β-CDs, two 4-chlorobenzoic acids and twenty-nine water molecules in the asymmetric unit, and can be formulated as 2（C42H70O35）·2（CTH5O2Cl）·29（H2O）. In the crystal lattice, two β-CDs form a face-to-face dimer jointed together through hydrogen bonding between the secondary hydroxyl groups of β--CDs. Two 4-chlorobenzoic acid molecules which contact by C-Cl…π interactions are included in the β-CD dimer cavity. The β-CD dimers are arranged in brickwork-like pattern along the crystallographic a-axis. The effect of guest molecule length on the inclusion geometry was discussed by comparative study of some fl-CD complexes containing similar guests.

关键词： β-Cyclodextrin 4-Chlorobenzoic acid Inclusion complex Crystal structure C-Cl…π interaction

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水泥固化土固化机理及抗冲刷特性

长江科学院院报 2024年第8期41卷 142-149页

作者：王秋生修一兵齐云鹏邓启华李广耀北京工业大学城市与工程安全减灾教育部重点实验室北京100124 中铁二十二局集团有限公司北京100043

为了完善水泥固化土抗冲刷性能方面的研究,使水泥固化土在水下结构防护中得到应用,在砂土和黏土中分别掺入水泥和与液体固化剂,采用土体冲刷函数测定仪(EFA)对水泥固化土开展了抗冲刷性能试验。在分析砂土和黏土的固化作用机理基础上,... 详细信息

为了完善水泥固化土抗冲刷性能方面的研究,使水泥固化土在水下结构防护中得到应用,在砂土和黏土中分别掺入水泥和与液体固化剂,采用土体冲刷函数测定仪(EFA)对水泥固化土开展了抗冲刷性能试验。在分析砂土和黏土的固化作用机理基础上,研究了固化剂和固化时间对水泥固化土抗冲刷性能的影响。研究结果表明:水泥固化土的强度随固化时间的增长而增大,黏土的强度快速增长阶段要早于砂土;固化剂可以有效提高土体的起动切应力,同时可以大幅减小土体的冲刷速率,明显提高了土体的抗冲刷强度;起动切应力的增长速率随固化时间增长逐渐减缓,存在临界最大值。根据起动切应力的变化特征提出了水泥固化土起动切应力预测模型,经试验数据对比,该模型可以较好地预测水泥固化土的起动切应力随固化时间的变化规律。

关键词：水泥固化土固化时间固化剂固化机理抗冲刷起动切应力

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