肾内科教学中采用SHARP反馈法的效果及对教学满意度的影响

目的探析SHARP反馈法在肾内科教学中的应用效果。方法选取2021年5月至2022年5月皖南医学院弋矶山医院肾内科实习生50名,依据随机数表法分为两组,每组各25名。对照组采用传统教学方法,观察组采用SHARP反馈法。比较两组学习成绩、教学质量评分及教学满意度。结果观察组学生学习成绩、教学质量评分包括学习和学术价值、教师的情操、组织和表达、师生关系和互动、教师知识面评分高于对照组,差异有统计学意义(P<0.05),观察组教学满意度、学习能力评分包括学生临床思维、课堂氛围、自学能力、临床实践能力、表达能力及知识关联能力高于对照组,差异有统计学意义(P<0.05)。结论肾内科教学中采用SHARP反馈法教学的效果明显,可提升实习生学习成绩,为实习生提供高质量教学,同时提升实习生对教学方法的满意度,临床教学中可大力推广及应用。

向量值多线性奇异积分算子的加权Sharp不等式

利用不等式、原子分解性质研究了向量值多线性算子,证明了某些向量值多线性奇异积分算子的一个加权Sharp不等式,并利用此不等式得到了该向量值多线性算子的加权L^(p)型不等式和L log L型不等式。

STABILITY OF THE RAREFACTION WAVE IN THE SINGULAR LIMIT OF A SHARP INTERFACE PROBLEM FOR THE COMPRESSIBLE NAVIER-STOKES/ALLEN-CAHN SYSTEM

This paper is concerned with the global well-posedness of the solution to the compressible Navier-Stokes/Allen-Cahn system and its sharp interface limit in one-dimensional space.For the perturbations with small energy but possibly large oscillations of rarefaction wave solutions near phase separation,and where the strength of the initial phase field could be arbitrarily large,we prove that the solution of the Cauchy problem exists for all time,and converges to the centered rarefaction wave solution of the corresponding standard two-phase Euler equation as the viscosity and the thickness of the interface tend to zero.The proof is mainly based on a scaling argument and a basic energy method.

Management of Penetrating Cranioencephalic Trauma Caused by Sharp Metal Objects—Therapeutic and Evolutionary Aspects: 12 Cases at the Renaissance University Hospital in N’Djamena

Introduction: Cranioencephalic trauma caused by bladed weapons is rare, and that caused by sharp objects is exceptional. The aim of our study was to describe the clinical, therapeutic and evolutionary aspects. Materials and method: This was a descriptive and analytical study over a 48-month period at CHU la Renaissance from January 1, 2018 to December 31, 2021, concerning patients admitted for penetrating cranioencephalic trauma by pointed object. Results: Twelve cases, all male, of penetrating cranioencephalic sharp-force trauma were identified. The mean age was 34 ± 7 years, with extremes of 11 and 60 years. Farmers and herders accounted for 31% and 25% of cases respectively. The average admission time was 47 hours. Brawls were the circumstances of occurrence in 81.2% of cases. Knives (33%), arrows (25%) and iron bars (16.6%) were the objects used. Altered consciousness was present in 43.8% of cases, and focal deficit in 50%. Scannographic lesions were fracture and/or embarrhment (12 cases), intra-parenchymal haematomas (6 cases) and presence of object in place (4 cases). Surgery was performed in 11 patients. Postoperative outcome was favorable in 9 patients. After 12 months, 2 patients were declared unfit. Conclusion: Penetrating head injuries caused by sharp objects are common in Chad. Urgent surgery can prevent disabling after-effects.

Numerical Study of a Three-Dimensional Laminar Flow in a Rectangular Channel with a 180-Degree Sharp Turn

This study presents a numerical analysis of three-dimensional steady laminar flow in a rectangular channel with a 180-degree sharp turn. The Navier-Stokes equations are solved by using finite difference method for Re = 900. Three-dimensional streamlines and limiting streamlines on wall surface are used to analyze the three-dimensional flow characteristics. Topological theory is applied to limiting streamlines on inner walls of the channel and two-dimensional streamlines at several cross sections. It is also shown that the flow impinges on the end wall of turn and the secondary flow is induced by the curvature in the sharp turn.

Hydrodynamic Behavior of Gap Resonance in Multiple-Box Systems with Sharp and Round Inlet Configurations

Fluid resonance within narrow gaps in multiple-box systems with sharp and round inlet configurations are investigated by using the potential flow and viscous fluid flow models in the OpenFOAM^(■)package.Evident discrepancy between two numerical models can be observed for sharp inlet configurations.In addition to the dramatical decrease of resonant amplitude in narrow gaps,some peak values at the higher resonant frequencies predicted by the potential flow model even disappear in the viscous fluid flow results.The decreased normalized resonant amplitudes with the increase of incident wave amplitude can be observed for sharp inlet configurations.However,the hydrodynamic behaviors of multiple-box system with round inlet configurations between potential flow and viscous fluid flow models are quite similar with each other.The normalized resonant amplitudes are nearly independent of incident wave amplitudes for multiple-box systems with round inlet configurations.This implies that the energy dissipation associated with fluid viscosity and flow rotation plays an important role in the gap resonance for sharp inlet configurations;while it is insignificant for round inlet configurations.

Genome sequencing reveals the evolution and pathogenic mechanisms of the wheat sharp eyespot pathogen Rhizoctonia cerealis

The necrotrophic fungus Rhizoctonia cerealis is the causal agent of devastating diseases of cereal crops including wheat(Triticum aestivum).We present a high-quality genome assembly of R.cerealis Rc207,a virulent strain causing wheat sharp eyespot.The assembly(56.36 Mb)is composed of 17.87%repeat sequences and 14,433 predicted protein-encoding genes.The Rc207 genome encodes a large and diverse set of genes involved in pathogenicity,especially rich in those encoding secreted proteins,carbohydrateactive enzymes(CAZymes),peptidases,nucleases,cytochrome P450,and secondary metabolismassociated enzymes.Most secretory protein-encoding genes,including CAZymes,peroxygenases,dehydrogenases,and cytochrome P450,were up-regulated during fungal infection of wheat.We identified 831 candidate secretory effectors and validated the functions of 10 up-regulated candidate effector proteins.Of them,nine were confirmed as necrotrophic pathogen’s effectors promoting fungal infection.Abundant potential mobile or plastic genomic regions rich in repeat sequences suggest their roles in fungal adaption and virulence-associated genomic evolution.This study provides valuable resources for further comparative and functional genomics on important fungal pathogens,and provides essential tools for development of effective disease control strategies.

Corrigendum to“Introgression of sharp eyespot resistance from Dasypyrum villosum chromosome 2VL into bread wheat”[Crop J.11(2023)1512–1520]

The authors regret to report some missing information in the authorship and associated changes of the paper.On page 1512,the author information reads:“Caiyun Liu a,Wei Guo a,Yang Wang b,Bisheng Fu a,Jaroslav Dolezel c,Ying Liu a,Wenling Zhai a,Mahmoud Said c,d,István Molnár c,d,e,Katerina Holušovác,Ruiqi Zhang b,*,Jizhong Wu a,f,g,*”.It should be changed to“Caiyun Liu a,1,Wei Guo a,1,Yang Wang b,Bisheng Fu a,Jaroslav Dolezel c,Ying Liu a,Wenling Zhai a,Mahmoud Said c,d,István Molnár c,d,e,Katerina Holušovác,Ruiqi Zhang b,*,Jizhong Wu a,f,g,*”.On page 1512 in the footnote,the following sentence should be added below the corresponding authors’information:1 These authors contributed equally to this work.The correction has been updated above.The authors would like to apologize for any inconvenience caused.

Effect of sharp vacuum-plasma boundary on the electron injection and acceleration in a few-cycle laser driven wakefield

The electron injection and acceleration driven by a few-cycle laser with a sharp vacuum-plasma boundary have been investigated through three-dimensional(3D)particle-in-cell simulations.It is found that an isotropic boundary impact injection(BII)first occurs at the vacuum-plasma boundary,and then carrier-envelope-phase(CEP)shift causes the transverse oscillation of the plasma bubble,resulting in a periodic electron self-injection(SI)in the laser polarization direction.It shows that the electron charge of the BII only accounts for a small part of the total charge,and the CEP can effectively tune the quality of the injected electron beam.The dependences of laser intensity and electron density on the total charge and the ratio of BII charge to the total charge are studied.The results are beneficial to electron acceleration and its applications,such as betatron radiation source.

Sharp极大算子定义域的一个特征

给出Sharp极大算子定义域D#及其特征性质.

基于资金限制的Sharp-ARIMA期货套期保值决策模型

通过ARIMA时间序列预测期货套期保值的资金需求量,以Sharp套期比模型为目标函数,以套保者的手头资金大于套保资金需求量为约束,建立基于资金限制的Sharp-ARIMA期货套期保值决策模型,解决基于资金限制的单品种期货套期比的确定问题。并利用WS411合约的历史数据实证分析了该模型。本模型的创新与特色一是决策模型确定了套期保值的资金需求,避免了因资金短缺导致的套保失败。二是提出了能够反映期货价格一阶平稳和季节性变化的套期保值资金需求量预测的研究思路,这就改变了现有研究仅对历史数据进行简单平均预测的现状,更加符合期货价格的波动规律。三是揭示出套期保值者手头持有的资金与套保比之间关系。

关于矩阵的Sharp序、*序和减序

给出矩阵Sharp序的一个新的刻画,由此得到(半)正定矩阵Sharp序与其平方矩阵Sharp序之间的关系.我们还讨论正规矩阵的*序与减序之间的关系,推广了关于Hermmice矩阵的相应结果.

基于修正Sharpe指数的我国开放式基金业绩评价研究

国内外大量实证研究发现基金收益率呈明显的尖峰、厚尾性和有偏性的非正态分布。针对Sharpe指数前提假设是收益率服从正态分布及使用标准差来度量投资风险的缺陷。本文提出用能更好的刻画投资基金收益率分布的非对称性和尖峰、厚尾性的Skewed-t分布来拟合基金收益率分布。在此基础上分别给出了基于Skewed-t分布标准差和Skewed-t分布下的FIGARCH-SKST模型测算的VaR值的修正夏普指数;然后对22只开放式基金数据进行了实证分析。结果表明,基于Skewed-t分布修正的Sharpe指数是有效的。

三种C Sharp调用Matlab方式的研究

常用的程序设计语言在统计方面存在不足,Matlab可以弥补这方面的不足,但Matlab在界面设计、运行效率上无法令人满意.在实际的项目开发中,特别当项目的主要功能是统计分析、模拟仿真时,一方面要有友好的用户界面,另一方面又要进行统计分析、模拟仿真,因而要将Matlab与程序设计语言进行集成开发.C Sharp是流行的程序设计语言,研究了C Sharp与Matlab集成的三种方式:C Sharp直接访问Matlab内置函数、构建.NET程序集和创建C语言共享库,通过比较可知:创建C语言共享库运行效率最高,但是稳定性不好;直接访问Matlab内置函数运行稳定,但是效率最低;构建.NET程序集方式运行稳定,并且效率较高.综合考虑,在实际应用中,采用构建.NET程序集的方式来集成C Sharp和Matlab应优先考虑.

基于谱映射的非线性Sharpe模型及其在基金投资风格识别中的应用

由于金融时间序列具有非线性的特点,经典的Sharpe模型难以全面、准确地描述经济变量之间的关系。为此,提出了基于谱映射的非线性Sharpe模型。谱映射的核心思想来源于经典的谱图理论。谱映射借助由数据集导出的一些特殊矩阵的部分特征向量,将该数据集投影至高维空间。在投影后的高维空间,数据集的有些性质得到改进,如原空间中线性不可分的数据集在高维空间线性可分。基于谱映射的非线性Sharpe模型,利用谱映射将基金收益率数据和风格指数收益率数据投影至高维空间,在高维空间利用经典Sharpe模型识别各基金的投资风格。利用基于谱映射的非线性Sharpe模型分析了部分开放式基金的投资风格。实验结果表明,本文提出的基于谱映射的非线性Sharpe模型的性能优于在原数据集上直接利用经典Sharpe模型得到的结果。

Sharp-van der Heijde评分对类风湿关节炎的临床应用价值

目的:探讨Sharp-van der Heijde(SHS)评分对类风湿关节炎(RA)的临床应用价值。方法:收集36例经临床证实的RA患者的临床及双手、腕关节X线正位平片资料,选用DAS28临床评分和SHS评分来对RA病情活动性进行量化评分,并进行统计学分析。结果:双手以月骨、多角骨、头骨三者骨质侵蚀性改变最严重;舟状骨、桡骨远端骨质侵蚀改变次之;第1至第4掌指关节骨质侵蚀性改变最轻。腕关节及第2至第4近侧指间关节狭窄最严重;第2至第5远侧指间关节狭窄次之;第1、第5掌指关节间隙狭窄最轻。SHS值与临床活动度评估(DAS28评分)之间存在显著相关性(rs=0.41,P<0.05),说明SHS值越高则临床症状越严重。结论:SHS值与DAS28值密切相关,可以作为判断患者病情严重程度的一个重要参考指标,有助于制订临床治疗方案和评价预后。

Calderón-Zygmund型算子及其交换子的sharp极大函数估计

该文建立了Calderón-Zygmund型算于及其交换子的sharp极大函数估计.作为应用,可以得到这些算子在Lebesgue空间和Morrey型空间上的有界性.

基于VaR的Sharpe指标在基金业绩评价中的应用

针对标准差衡量风险中的缺陷,本文考虑下方风险和收益波动的时变性,对计算Shapre值时的风险测度进行了调整。实证部分,应用传统的Sharpe比率、基于VaR的Sharpe比例和基于条件VaR的条件Sharpe值对中国证券市场上运作满3年的33只封闭式基金在2001-2003年间的业绩进行了检验,分析了基金控制风险和实现收益水平上的差异。

用于择优决策的广义Sharpe比率

在 Dowd对备选资产是否值得投资的研究基础上 ,推导出在可供选择的不同备选资产中择优投资的判据 ,从而扩展了广义 Sharpe比率的使用范围 ,解决了备选资产与原有投资组合中其他资产的收益存在相关性时 ,标准 Sharpe比率无法应用的问题。最后 ,还用图示分析了基准选取不合适可能造成的计算误差。

范畴中态射集的sharp序

定义了范畴中态射集的ｓｈａｒｐ序，给出了它的一些性质和等价刻划，并讨论了它与态射集减序的关系．