期刊文献+
共找到278,332篇文章
< 1 2 250 >
每页显示 20 50 100
The Marshall-Olkin Right Truncated Fréchet-Inverted Weibull Distribution: Its Properties and Applications 认领
1
作者 Nora Nader M. A. El-Damcese B. S. El-Desouky 《建模与仿真(英文)》 2021年第1期74-89,共16页
In this paper, a new probability distribution is proposed by using Marshall and Olkin transformation. Some of its properties such as moments, moment generating function, order statistics and reliability functions are ... In this paper, a new probability distribution is proposed by using Marshall and Olkin transformation. Some of its properties such as moments, moment generating function, order statistics and reliability functions are derived. The method of </span><span style="font-family:Verdana;">maximum likelihood is used to estimate the model parameters. The graphs of the reliability function and hazard rate function are plotted by taken some values of the parameters. Three real life applications are introduced to compare the behaviour of the new distribution with other distributions. 展开更多
关键词 Marshall and Olkin Moment Generating Function Density Function Order Statistics Reliability Function Inverse Weibull Distribution Maximum Likelihood
在线阅读 免费下载
人工物的“功能”有何功能? 认领
2
作者 刘振 《自然辩证法研究》 北大核心 2021年第2期32-36,共5页
在处理人工物结构-功能二重性难题的众多回答中,人工物的功能方案最具吸引力。但是,早期的功能概念过于泛化,难以标识人工物的本质。特有功能是功能概念的深化。使用基原加复制模式来刻画人工物时,无法解释新创人工物不断出现的事实。... 在处理人工物结构-功能二重性难题的众多回答中,人工物的功能方案最具吸引力。但是,早期的功能概念过于泛化,难以标识人工物的本质。特有功能是功能概念的深化。使用基原加复制模式来刻画人工物时,无法解释新创人工物不断出现的事实。普雷斯顿将功能进一步区分为特有功能和系统功能,但因缺少更精细的概念工具,将使得这一区分破产。目前人工物功能理论尚不具备清晰说明人工物"功能"的功能。 展开更多
关键词 人工物 规范矩阵 功能 特有功能 意向实体
Variational Calculations of Energies of the (2<i>snl</i>) <sup>1,3</sup><i>L<sup>π</sup></i>and (2<i>pnl</i>) <sup>1,3 </sup><i>L<sup>π</sup></i>Doubly Excited States in Two-Electron Systems Applying the Screening Constant per Unit Nuclear Charge 认领
3
作者 Momar Talla Gning Ibrahima Sakho +5 位作者 Maurice Faye Malick Sow Babou Diop Jean Kouhissoré Badiane Diouldé Ba Abdourahmane Diallo 《现代物理(英文)》 2021年第3期328-352,共25页
In this paper, resonance energies and excitation energies of doubly 2<em>sns</em> <sup>1,3</sup><em>S</em><sup>e</sup>, 2<em>snp</em> <sup>1,3</sup&... In this paper, resonance energies and excitation energies of doubly 2<em>sns</em> <sup>1,3</sup><em>S</em><sup>e</sup>, 2<em>snp</em> <sup>1,3</sup><em>P</em><sup>0</sup>, 2<em>pnp</em> <sup>1,3</sup><em>D</em><sup>e</sup>, 2<em>pnd</em> <sup>1,3</sup><em>F</em><sup>0</sup> and 2<em>pnf</em> <sup>1,3</sup><em>G</em><sup>e</sup> excited states of the helium isoelectronic sequence with <em>Z</em> <span style="white-space:nowrap;">≤</span> 10 are calculated. Calculations are carried out in the framework of the variational procedure of the formalism of the Screening Constant per Unit Nuclear Charge (SCUNC). New correlated wave function of Hylleraas type is used. Precise resonance and excitation energies are tabulated and good agreement is obtained when a comparison is made with available literature values. 展开更多
关键词 Doubly Excited States Helium Isoelectronic Sequence Screening Constant per Unit Nuclear Charge (SCUNC) Correlated Wave Function Resonance Energy Excitation Energies
在线阅读 免费下载
Advance Techniques in Medical Imaging under Big Data Analysis: Covid-19 Images 认领
4
作者 S. Zimeras 《计算机断层扫描(英文)》 2021年第1期1-10,共10页
Quantitative analysis of digital images requires detection and segmentation of the borders of the object of interest. Accurate segmentation is required for volume determination, 3D rendering, radiation therapy, and su... Quantitative analysis of digital images requires detection and segmentation of the borders of the object of interest. Accurate segmentation is required for volume determination, 3D rendering, radiation therapy, and surgery planning. In medical images, segmentation has traditionally been done by human experts. Substantial computational and storage requirements become especially acute when object orientation and scale have to be considered. Therefore, automated or semi-automated segmentation techniques are essential if these software applications are ever to gain widespread clinical use. Many methods have been proposed to detect and segment 2D shapes, most of which involve template matching. Advanced segmentation techniques called Snakes or active contours have been used, considering deformable models or templates. The main purpose of this work is to apply segmentation techniques for the definition of 3D organs (anatomical structures) when big data information has been stored and must be organized by the doctors for medical diagnosis. The processes would be implemented in the CT images from patients with COVID-19. 展开更多
关键词 Segmentation Techniques Big Data Analysis Contour Model Shape Model Radial Basis Function Active Contours Snakes
在线阅读 免费下载
Universal function of the diffractive process in color dipole picture 认领
5
作者 Z.Jalilian G.R.Boroun 《中国物理C:英文版》 SCIE CAS CSCD 2021年第2期111-118,共8页
In this study,we obtain the universal function corresponding to the diffractive process and show that the cross section exhibits geometrical scaling.It is observed that diffractive theory according to the color dipole... In this study,we obtain the universal function corresponding to the diffractive process and show that the cross section exhibits geometrical scaling.It is observed that diffractive theory according to the color dipole approach at small-x is a convenient framework that reveals the color transparency and saturation phenomena.We also calculate the contribution of heavy quark production in the diffractive cross section at high energy that is determined by the small size dipole configuration.The ratio of the diffractive cross section to the total cross section in electron-proton collision is the other important quantity that is computed in this work. 展开更多
关键词 universal function structure function cross section color dipole model diffractive process
跟踪微分器改进算法的应用分析 认领
6
作者 李宏扬 《吉林大学学报:信息科学版》 CAS 2021年第1期45-50,共6页
为克服传统的跟踪微分器在进入稳态后出现的高频振颤现象,引入了一个新的综合控制函数。利用Matlab/Simulink软件中的S-函数对跟踪微分器进行了建模、封装,通过仿真技术进行了实验分析与研究。数值仿真结果表明,应用新的综合控制函数的... 为克服传统的跟踪微分器在进入稳态后出现的高频振颤现象,引入了一个新的综合控制函数。利用Matlab/Simulink软件中的S-函数对跟踪微分器进行了建模、封装,通过仿真技术进行了实验分析与研究。数值仿真结果表明,应用新的综合控制函数的跟踪微分器,不但能快速无超调地跟踪输入信号,而且消除了输入信号的微分稳态时的高频振颤;对混入噪声的信号,它还能有效地抑制噪声,还原初始信号,具有良好的滤波作用。 展开更多
关键词 跟踪微分器 S-函数 综合控制函数 滤波
在线阅读 下载PDF
Randomized Objective Function Linear Programming in Risk Management 认领
7
作者 Dennis Ridley Felipe Llaugel +1 位作者 Inger Daniels Abdullah Khan 《应用数学与应用物理(英文)》 2021年第3期391-402,共12页
The traditional linear programming model is deterministic. The way that uncertainty is handled is to compute the range of optimality. After the optimal solution is obtained, typically by the simplex method, one consid... The traditional linear programming model is deterministic. The way that uncertainty is handled is to compute the range of optimality. After the optimal solution is obtained, typically by the simplex method, one considers the effect of varying each objective function coefficient, one at a time. This yields the range of optimality within which the decision variables remain constant. This sensitivity analysis is useful for helping the analyst get a sense for the problem. However, it is unrealistic because objective function coefficients tend not to stand still. They are typically profit contributions from products sold and are subject to randomly varying selling prices. In this paper, a realistic linear program is created for simultaneously randomizing the coefficients from any probability distribution. Furthermore, we present a novel approach for designing a copula of random objective function coefficients according to a specified rank correlation. The corresponding distribution of objective function values is created. This distribution is examined directly for central tendency, spread, skewness and extreme values for the purpose of risk analysis. This enables risk analysis and business analytics, emerging topics in education and preparation for the knowledge economy. 展开更多
关键词 Linear Programming RANDOM Objective Function Profit Distribution RISK Monte Carlo Simulation
在线阅读 免费下载
Electronic Transport Properties of Phenalenyl Molecular Devices via Gated Modulation 认领
8
作者 Xiaohui Jiang Wen Liu Jianhua Zhao 《应用数学与应用物理(英文)》 2021年第3期503-514,共12页
By applying nonequilibrium Green’s functions (NEGF) in combination with the density functional theory (DFT), we investigate the electronic transport properties of gated phenalenyl molecular devices with two different... By applying nonequilibrium Green’s functions (NEGF) in combination with the density functional theory (DFT), we investigate the electronic transport properties of gated phenalenyl molecular devices with two different contact geometries. The calculated results show that electronic transport properties of the two different devices can be modulated by external transverse gates. When the molecule contacts the Au electrodes through two second-nearest sites, the current-voltage (<em>I</em>-<em>V</em>) characteristic curves are symmetric and suppressed by the gate electrodes. However, a rectifying behavior will occur when the electrodes connect the molecule on both sides, one second-nearest site and one third-nearest site, respectively. Mechanisms for such phenomena are proposed and these findings suggest a new opportunity for developing molecular devices. 展开更多
关键词 Electronic Transport Transverse Gate Nonequilibrium Green’s Function Phenalenyl Molecular
在线阅读 免费下载
运动干预功能障碍人群血流限制训练的文献热点可视化分析 认领
9
作者 王梦婷 古艳萍 +3 位作者 任文博 覃倩 白冰怡 廖远朋 《中国组织工程研究》 CAS 北大核心 2021年第8期1264-1269,共6页
背景:血流限制训练作为一种新兴训练方式,可有效增加肌肉力量和容积、提高肌肉功能,为运动干预功能障碍提供一种新途径。而该领域目前从机制到应用存在诸多争议。目的:探究近年来血流限制训练应用的研究热点与主要内容,为该领域未来研... 背景:血流限制训练作为一种新兴训练方式,可有效增加肌肉力量和容积、提高肌肉功能,为运动干预功能障碍提供一种新途径。而该领域目前从机制到应用存在诸多争议。目的:探究近年来血流限制训练应用的研究热点与主要内容,为该领域未来研究发展提供新的思路和方向。方法:运用CiteSpace 5.6.R3软件对Web of Science核心合集数据库中2009至2019年有关血流限制训练的441篇文献进行可视化分析,综合图谱和数据结果,结合关键文献分析研究热点。结果与结论:①血流限制训练研究自21世纪以来呈上升趋势,主要以美国、日本及其机构发表成果较多且影响力较高;②研究主题发展趋势逐渐从对局部组织器官的影响向对身体机能影响发展,从普通人群训练应用向特殊人群干预治疗发展;③热点关键词为血流限制、力量、骨骼肌、肌肥大、生长激素和适应,研究热点主要内容包括不同生理适应机制、训练方法学影响变量、功能障碍人群康复应用及心血管循环功能影响等;④低负荷血流限制训练作为一种运动干预的有效方法,逐渐被应用在骨骼肌肉、心血管、代谢及神经疾病的临床治疗或康复干预中,未来研究可围绕血流限制训练长期运动效益、运动生理适应机制、不同人群应用效果、训练方法安全性等内容发展。 展开更多
关键词 肌肉 血流 可视化分析 CITESPACE 功能 心血管功能 运动
在线阅读 下载PDF
Toeplitz Determinants for the Inverse of Starlike Functions Connected with the Sine Function 认领
10
作者 Dong GUO Zongtao LI +1 位作者 Huo TANG En AO 《数学研究及应用:英文版》 CSCD 2021年第2期141-149,共9页
Let S_s*be the class of normalized functions f defined in the open unit■such that the quantity zf’(z)/f(z)lies in an eight-shaped region in the right-half plane and satisfies the condition■.In this paper,we aim to ... Let S_s*be the class of normalized functions f defined in the open unit■such that the quantity zf’(z)/f(z)lies in an eight-shaped region in the right-half plane and satisfies the condition■.In this paper,we aim to investigate Toeplitz determinants for the inverse of this function classes S_s*associated with sine function. 展开更多
关键词 inverse of starlike function Toeplitz determinant sine function upper bound
Strong Goldbach Conjecture and Generalized Moser-Type Inequalities 认领
11
作者 ZHANG Shaohua 《武汉大学自然科学学报:英文版》 CAS CSCD 2021年第1期15-18,共4页
In this paper,we consider the generalized Moser-type inequalities,sayφ(n)≥kπ(n),where k is an integer greater than 1,φ(n)is Euler function andπ(n)is the prime counting function.Using computer,Pierre Dusart’s ine... In this paper,we consider the generalized Moser-type inequalities,sayφ(n)≥kπ(n),where k is an integer greater than 1,φ(n)is Euler function andπ(n)is the prime counting function.Using computer,Pierre Dusart’s inequality onπ(n)and Rosser-Schoenfeld’s inequality involvingφ(n),we give all solutions ofφ(n)=2π(n)andφ(n)=3π(n),respectively.Moreover,we obtain the best lower bound that Moser-type inequalitiesφ(n)>kπ(n)hold for k=2,3.As consequences,we show that every even integer greater than 210 is the sum of two coprime composite,every odd integer greater than 175 is the sum of three pairwise coprime odd composite numbers,and every odd integer greater than 53 can be represented as p+x+y,where p is prime,x and y are composite numbers satisfying that p,and x and y are pairwise coprime.Specially,we give a new equivalent form of Strong Goldbach Conjecture. 展开更多
关键词 Strong Goldbach Conjecture pairwise coprime Euler totient function prime-counting function
Extreme Values of Wind Speed over the Kara Sea Based on the ERA5 Dataset 认领
12
作者 Alexander Kislov Tatyana Matveeva 《大气和气候科学(英文)》 2021年第1期98-113,共16页
Extreme values of wind speed were studied based on the highly detailed ERA5 dataset covering the central part of the Kara Sea. Cases in which the ice coverage of the cells exceeded 15% were filtered. Our study shows t... Extreme values of wind speed were studied based on the highly detailed ERA5 dataset covering the central part of the Kara Sea. Cases in which the ice coverage of the cells exceeded 15% were filtered. Our study shows that the wind speed extrema obtained from station observations, as well as from modelling results in the framework of mesoscale models, can be divided into two groups according to their probability distribution laws. One group is specifically designated as black swans, with the other referred to as dragons (or dragon-kings). In this study we determined that the data of ERA5 accurately described the swans, but did not fully reproduce extrema related to the dragons;these extrema were identified only in half of ERA5 grid points. Weibull probability distribution function (PDF) parameters were identified in only a quarter of the pixels. The parameters were connected almost deterministically. This converted the Weibull function into a one-parameter dependence. It was not clear whether this uniqueness was a consequence of the features of the calculation algorithm used in ERA5, or whether it was a consequence of a relatively small area being considered, which had the same wind regime. Extremes of wind speed arise as mesoscale features and are associated with hydrodynamic features of the wind flow. If the flow was non-geostrophic and if its trajectory had a substantial curvature, then the extreme velocities were distributed according to a rule similar to the Weibull law. 展开更多
关键词 ERA5 Kara Sea Weibull Probability Distribution Function Wind Speed Hydrodynamics and Statistics of Extreme Events
在线阅读 免费下载
Evaluation of Exponential Integral by Means of Fast-Converging Power Series 认领
13
作者 Serdar Beji 《理论数学进展(英文)》 2021年第1期101-108,共8页
Exponential integral for real arguments is evaluated by employing a fast-converging power series originally developed for the resolution of Grandi’s paradox. Laguerre’s historic solution is first recapitulated and t... Exponential integral for real arguments is evaluated by employing a fast-converging power series originally developed for the resolution of Grandi’s paradox. Laguerre’s historic solution is first recapitulated and then the new solution method is described in detail. Numerical results obtained from the present series solution are compared with the tabulated values correct to nine decimal places. Finally, comments are made for the further use of the present approach for integrals involving definite functions in denominator. 展开更多
关键词 Exponential Integral Gamma Function Laguerre Solution Fast-Converging Power Series
在线阅读 免费下载
A Stochastic SVIR Model for Measles 认领
14
作者 Moussa Seydou Ousmane Moussa Tessa 《应用数学(英文)》 2021年第3期209-223,共15页
In this article, we consider the construction of a SVIR (Susceptible, Vaccinated, Infected, Recovered) stochastic compartmental model of measles. We prove that the deterministic solution is asymptotically the average ... In this article, we consider the construction of a SVIR (Susceptible, Vaccinated, Infected, Recovered) stochastic compartmental model of measles. We prove that the deterministic solution is asymptotically the average of the stochastic solution in the case of small population size. The choice of this model takes into account the random fluctuations inherent to the epidemiological characteristics of rural populations of Niger, notably a high prevalence of measles in children under 5, coupled with a very low immunization coverage. 展开更多
关键词 MEASLES Compartmental Model SVIR Basic Reproductive Number Markov Chains Lyapunov Function Stochastic Stability Stochastic Simulation NIGER
在线阅读 免费下载
Output Constrained Adaptive Controller Design for Nonlinear Saturation Systems 认领
15
作者 Yongliang Yang Zhijie Liu +1 位作者 Qing Li Donald C.Wunsch 《自动化学报:英文版》 SCIE EI CSCD 2021年第2期441-454,共14页
This paper considers the adaptive neuro-fuzzy control scheme to solve the output tracking problem for a class of strict-feedback nonlinear systems.Both asymmetric output constraints and input saturation are considered... This paper considers the adaptive neuro-fuzzy control scheme to solve the output tracking problem for a class of strict-feedback nonlinear systems.Both asymmetric output constraints and input saturation are considered.An asymmetric barrier Lyapunov function with time-varying prescribed performance is presented to tackle the output-tracking error constraints.A high-gain observer is employed to relax the requirement of the Lipschitz continuity about the nonlinear dynamics.To avoid the"explosion of complexity",the dynamic surface control(DSC)technique is employed to filter the virtual control signal of each subsystem.To deal with the actuator saturation,an additional auxiliary dynamical system is designed.It is theoretically investigated that the parameter estimation and output tracking error are semi-global uniformly ultimately bounded.Two simulation examples are conducted to verify the presented adaptive fuzzy controller design. 展开更多
关键词 Asymmetric barrier Lyapunov function input saturation Nussbaum function time-varying prescribed performance
在线阅读 下载PDF
Neuroimaging mechanisms of high-frequency repetitive transcranial magnetic stimulation for treatment of amnestic mild cognitive impairment:a double-blind randomized sham-controlled trial 认领
16
作者 Li-Qiong Yuan Qing Zeng +5 位作者 Dan Wang Xiu-Yun Wen Yu Shi Fen Zhu Shang-Jie Chen Guo-Zhi Huang 《中国神经再生研究:英文版》 SCIE CAS CSCD 2021年第4期707-713,共7页
Individuals with amnestic mild cognitive impairment(aMCI)have a high risk of developing Alzheimer’s disease.Although repetitive transcranial magnetic stimulation(rTMS)is considered a potentially effective treatment f... Individuals with amnestic mild cognitive impairment(aMCI)have a high risk of developing Alzheimer’s disease.Although repetitive transcranial magnetic stimulation(rTMS)is considered a potentially effective treatment for cognitive impairment in patients with aMCI,the neuroimaging mechanisms are poorly understood.Therefore,we performed a double-blind randomized sham-controlled trial in which rTMS was applied to the left dorsolateral prefrontal cortex of aMCI patients recruited from a community near the Third Hospital Affiliated to Sun Yat-sen University,China.Twenty-four patients with aMCI were randomly assigned to receive true rTMS(treatment group,n=12,6 men and 6 women;age 65.08±4.89 years)or sham stimulation(sham group,n=12,5 men and 7 women;age 64.67±4.77 years).rTMS parameters included a stimulation frequency of 10 Hz,stimulation duration of 2 seconds,stimulation interval of 8 seconds,20 repetitions at 80%of the motor threshold,and 400 pulses per session.rTMS/sham stimulation was performed five times per week over a period of 4 consecutive weeks.Our results showed that compared with baseline,Montreal Cognitive Assessment scores were significantly increased and the value of the amplitude of low-frequency fluctuation(ALFF)was significantly increased at the end of treatment and 1 month after treatment.Compared with the sham group,the ALFF values in the right inferior frontal gyrus,triangular part of the inferior frontal gyrus,right precuneus,left angular gyrus,and right supramarginal gyrus were significantly increased,and the ALFF values in the right superior frontal gyrus were significantly decreased in the treatment group.These findings suggest that high-frequency rTMS can effectively improve cognitive function in aMCI patients and alter spontaneous brain activity in cognitive-related brain areas.This study was approved by the Ethics Committee of Shenzhen Baoan Hospital of Southern Medical University,China(approval No.BYL20190901)on September 3,2019 and registered in the Chinese Clinical Trials Registry(regi 展开更多
关键词 Alzheimer’s disease clinical trial cognitive function cognitive impairment functional magnetic resonance imaging neurological function repetitive transcranial magnetic stimulation
在线阅读 下载PDF
Weapon effectiveness and the shapes of damage functions 认领
17
作者 Sei-Hoon Moon 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第2期617-632,共16页
This paper provides a review of methods of assessing a fragmentation weapon’s effectiveness against a point target or an area target with keeping the focus on the necessity of using the Carleton damage function with ... This paper provides a review of methods of assessing a fragmentation weapon’s effectiveness against a point target or an area target with keeping the focus on the necessity of using the Carleton damage function with the correct shape factor.First,cookie-cutter damage functions are redefined to preserve the shape factor of and to have the same lethal area as the corresponding Carleton damage function.Then,closed-form solutions of the effectiveness methods are obtained by using those cookie-cutter damage functions and the Carleton damage function.Finally,the closed-form solutions are applied to calculate the probability of damaging a point target and the expected fractional damage to an area target for several attack scenarios by using cookie-cutter damage functions and the Carleton damage functions with different shape factors.The comparison of the calculation results shows that using cookie-cutter damage functions or the Carleton damage function with a wrong shape factor results in quite significant differences from using the original Carleton damage function with a correct shape factor when weapon’s delivery error deviations are less than or comparable to the lengths of the lethal area and the aim point is far from a target.The effectiveness methods improved in this paper will be useful for mission planning utilizing the precision-guided munitions in circumstances where the collateral damage should be reduced. 展开更多
关键词 Weapon effectiveness Point target Area target Cookie-cutter damage function Carleton damage function
在线阅读 免费下载
Does Stem Cell Implantation Have an Effect on Severity of Retinitis Pigmentosa: Evaluation with a Classification System? 认领
18
作者 Ayşe Öner Neslihan Sinim Kahraman 《眼科学期刊(英文)》 2021年第1期36-48,共13页
<strong>Background:</strong> Cell replacement therapies have been evaluated in recent years as an alternative for various retinal pathologies to evaluate the therapeutic efficacy of cell therapy, it is imp... <strong>Background:</strong> Cell replacement therapies have been evaluated in recent years as an alternative for various retinal pathologies to evaluate the therapeutic efficacy of cell therapy, it is important to measure the severity of the disease. The aim of this study was to evaluate the effect of umbilical cord derived Mesenchymal Stem Cell (UC-MSC) implantation on severity of Retinitis Pigmentosa (RP). <strong>Methods:</strong> This single-center, clinical study included data of 138 eyes of 92 patients who had a confirmed diagnosis of RP and received stem cell implantation to the suprachoroidal area with a surgical procedure. Patients were evaluated before and 1 year after the surgery regarding to the outcome measures of Best Corrected Visual Acuity (BCVA), Optical Coherence Tomography (OCT) and Visual Field (VF) tests. BCVA, VF width and ellipsoid zone (EZ) width on OCT were recorded for each patient and a scoring criterion was established for each variable varying from 0 to 5 depending on its distribution. The cumulative score (from 0 to 15) was used to classify disease severity from grade 0 to 5. <strong>Results:</strong> All of the patients completed 12-month follow-up period. The median age of the patients was 40.8 years, 46% were female, 77% had been diagnosed within 10 years and 41% had a family history. 79% of the patients with family history had autosomal recessive inheritance pattern. There were statistically significant improvements in the mean BCVA and VF scores during the study (p < 0.05). The mean score and the mean grade of the disease also improved after the treatment (p < 0.05). There was a negative correlation between BCVA improvement and scoring and grading of the disease. <strong>Conclusions:</strong> This study demonstrated beneficial effect of suprachoroidally applied UC-MSCs on BCVA, VF and the severity score and grade of the disease during 12-month follow-up period. Cell mediated therapy based on the secretion of Growth Factors (GFs) seems to be an effective and safe option for the 展开更多
关键词 Cell Mediated Therapy Retinitis Pigmentosa Suprachoroidal Implantation Umbilical Cord Derived Mesenchymal Stem Cell Visual Function Classification
在线阅读 免费下载
A Self-Linking Field Formalism 认领
19
作者 Edwin Eugene Klingman 《现代物理(英文)》 2021年第4期440-452,共13页
The Gauss-linking integral for disjoint oriented smooth closed curves is derived linking integrals from the Biot-Savart description of the magnetic field. DeTurck and Gluck extend this linking from 3-space <em>R... The Gauss-linking integral for disjoint oriented smooth closed curves is derived linking integrals from the Biot-Savart description of the magnetic field. DeTurck and Gluck extend this linking from 3-space <em>R</em><sup>3</sup> to <em>SU</em> (2) space of the unit 3-sphere and hyperbolic space in Minkowski <em>R</em><sup>1,3</sup>. I herein extend Gauss-linking to self-linking and develop the concept of self-dual, which is then applied to gravitomagnetic dynamics. My purpose is to redefine Wheeler’s <em>geon</em> from unstable field structures based on the electromagnetic field to self-stabilized gravitomagnetic field structures. 展开更多
关键词 Gauss-Linking Self-Linking Biot-Savart Operator Green’s Function Laplacian Maxwell’s Eqns GRAVITOMAGNETISM SELF-DUAL Geons
在线阅读 免费下载
Evaluating the Impact of a Pilates Intervention on Physical Function in Children with Hypermobility Spectrum Disorder: A Study Protocol Using Single-Case Experimental Design 认领
20
作者 Elizabeth A. Hornsby Leanne M. Johnston 《儿科学期刊(英文)》 2021年第1期55-70,共16页
<strong>Background:</strong> <span><span><span style="font-family:""><span style="font-family:Verdana;">Pilates has been shown to be an effective interventi... <strong>Background:</strong> <span><span><span style="font-family:""><span style="font-family:Verdana;">Pilates has been shown to be an effective intervention for adults with musculoskeletal conditions with only a few examples available in the li</span><span style="font-family:Verdana;">terature for children. As musculoskeletal pain is a major symptom expe</span><span style="font-family:Verdana;">rienced by children with Hypermobility Spectrum Disorder (HSD), they may benefit from practicing Pilates to improve postural alignment, strength and motor control to effectively distribute movement load and decrease adverse load through involved joints. </span><b><span style="font-family:Verdana;">Method:</span></b><span style="font-family:Verdana;"> This study aims to evaluate the impact of a Physiotherapy-led Pilates intervention on school aged children with HSD and the benefits of this approach on pain, physical function and quality of life when delivered in a community-based model of care. A single-case experimental design (SCED) that incorporates a multiple baseline design will be used. Children with HSD, aged from 8 to 12 years, will commence concurrently in this study. Participants will undergo multiple assessments through all phases of the study which incorporates an A-B-A withdrawal design. The initial baseline period will be randomised from 5 to 7 weeks duration, then participants will enter the intervention period for 8 weeks followed by a withdrawal period of 5 weeks. The Physiotherapy-led Pilates intervention will consist of individual, 45 minute bi-weekly sessions, performed on both mat and the Pilates Reformer with an additional home program of mat exercises performed weekly. The study hypotheses are that children will show: 1) a decrease in pain;2) an increase in their physical function as measured by muscle strength, postural control, fatigue and physical activity levels;and 3) an improvement in their Health Related Quality of Life in the domains of physical, emotional, social and school functioning. </s 展开更多
关键词 PILATES PAIN Physical Function HYPERMOBILITY CHILDREN
在线阅读 免费下载
上一页 1 2 250 下一页 到第
使用帮助 返回顶部 意见反馈