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Means of Choice for Interactive Management of dynamic Geometry Problems Based on Instrumented Behaviour

American Journal of Computational Mathematics 2013年第3期3卷 41-51页

作者： Philippe R. Richard Michel Gagnon Josep Maria fortuny Nicolas Leduc Michèle Tessier-Baillargeon departament de didàctica de les Matemàtiques i de les Ciències Experimentals Universitat Autònoma de Barcelona Spain département de didactique Université de Montréal Canada département de génie informatique et génie logiciel école Polytechnique de Montréal Canada

Our paper presents a project that involves two research questions: does the choice of a related problem by the tutorial system allow the problem solving process which is blocked for the student to be restarted? What information about learning do related problems returned by the system provide us? We answer the first question according to the didactic engineering, whose mode of validation is internal and based on the confrontation between an a priori analysis and an a posteriori analysis that relies on data from experiments in schools. We consider the student as a subject whose adaptation processes are conditioned by the problem and the possible interactions with the computer environment, and also by his knowledge, usually implicit, of the institutional norms that condition his relationship with geometry. Choosing a set of good problems within the system is therefore an essential element of the learning model. Since the source of a problem depends on the student’s actions with the computer tool, it is necessary to wait and see what are the related to problems that are returned to him before being able to identify patterns and assess the learning. With the simultaneity of collecting and analysing interactions in each class, we answer the second question according to a grounded theory analysis. By approaching the problems posed by the system and the designs in play at learning blockages, our analysis links the characteristics of problems to the design components in order to theorize on the decisional, epistemological, representational, didactic and instrumental aspects of the subject-milieu system in interaction.

关键词： didactics of Mathematics Competencies Geometric Thinking Tutorial System Related Problems dynamic Geometry Instrumented Behavior Cognitive Interactions Conceptions Mathematical Work Space Means of Choice didactic Contract

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鳄鱼上颚的形貌曲面拟合及其偏差分析

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沈阳工业大学学报 2021年第4期43卷 444-449页

作者：周祖鹏裴雨蒙 Josep fortuny Jordi Marcé Nogué 蒋开云钟雪波桂林电子科技大学机电工程学院广西桂林541004 巴塞罗那自治大学克鲁萨芳古生物研究所巴塞罗那75005 汉堡大学自然历史中心汉堡20146

为了研究鳄鱼上颚的形貌特征对其结构特性的影响并将其应用于仿生设计,需对鳄鱼上颚的曲面进行提取并研究.运用逆向工程技术对鳄鱼头骨进行三维重构,并结合多项式拟合方法分别建立按照生物形貌特征划分的三个曲面的数学模型,将三个数学... 详细信息

为了研究鳄鱼上颚的形貌特征对其结构特性的影响并将其应用于仿生设计,需对鳄鱼上颚的曲面进行提取并研究.运用逆向工程技术对鳄鱼头骨进行三维重构,并结合多项式拟合方法分别建立按照生物形貌特征划分的三个曲面的数学模型,将三个数学模型的数据进行合并后与生物模型进行偏差对比.结果表明,三个数学模型拟合方程拟合后的确定系数值均接近于1,且其标准偏差在可接受范围内.复杂生物曲面模型可转化为多个数学模型,再将多个数学模型的数据合并后转化为完整的模型,可为鳄鱼头骨的力学特性研究及工程仿生设计提供依据.

关键词：鳄鱼结构特性曲面拟合逆向工程技术三维重构数学模型偏差分析仿生设计

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量身定制的仓库技术

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现代制造 2008年第31期 42-43页

作者： gera Knehr

无论是钢铁加工还是飞机制造工业,人们要求过程越来越快,越来越灵活。面对这种要求,首先是输送系统遇到了挑战。同时,市场的取向越来越强烈地面向具体的客户需求,越来越要求有量体裁衣的解决方案;标准的性能越来越罕见。此外,具有较高... 详细信息

无论是钢铁加工还是飞机制造工业,人们要求过程越来越快,越来越灵活。面对这种要求,首先是输送系统遇到了挑战。同时,市场的取向越来越强烈地面向具体的客户需求,越来越要求有量体裁衣的解决方案;标准的性能越来越罕见。此外,具有较高灵话性的系统非常俏销;同时,仓库的可扩展性也是一个重要的标准。

关键词：仓库技术定制输送系统制造工业客户需求高灵活性可扩展性标准

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物流自动化成为现实

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现代制造 2007年第35期 46-47页

作者： gera Knehr

谈到产品的仓储问题,总是会有一些要求采用新的、复杂的工艺流程和生产技术的特殊产品,很高的质量标准或一些其他的规程。仓储系统的各种设备器具也必须适应各种类型产品的具体要求。

关键词：物流自动化仓储系统生产技术工艺流程质量标准产品

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废放射源的安全管理——减少危险

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国际原子能机构通报 2000年第3期42卷 60-63页

作者： VILMOS FRIEdRICH FERRUCCIO gera IAEA核燃料循环与废物技术处辐射与废物安全处

无论在发达国家还是在发展中国家,密封放射源都被广泛用于农业、工业、医学和各研究领域。世界上的密封放射源估计达数百万个,尽管在册源的数量比这要少得多。密封源是一种(a)永久密封在容器中或(b)紧密束缚在固态基质内的放射性物质。... 详细信息

无论在发达国家还是在发展中国家,密封放射源都被广泛用于农业、工业、医学和各研究领域。世界上的密封放射源估计达数百万个,尽管在册源的数量比这要少得多。密封源是一种(a)永久密封在容器中或(b)紧密束缚在固态基质内的放射性物质。密封源的容器或基质材料应很牢固。

关键词：废放射源密封放射源安全管理密封源发展中国家发达国家放射性废物成员国放射源安全国际合作

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Mixed convection of alumina-water nanofluid inside a concentric annulus considering nanoparticle migration

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Particuology 2016年第1期14卷 113-122页

作者： A. Malvandi d.d. Ganji department of Mechanical Engineering Neyshabur Branch Islamic Azad University Neyshabur Iran Mechanical Engineering department Babol University of Technology Babol Iran

A theoretical investigation was conducted of laminar fully developed mixed convection of alumina-water nanofluid through a vertical annulus, to improve its heating/cooling performance. We focused on con- trolling the nanoparticle migration and studying how it affected the heat transfer rate and pressure drop. Because the nanoparticles have very small dimensions, we only considered Brownian motion and ther- mophoretic diffusivity as the main causes of nanoparticle migration. Because thermophoresis is very sensitive to temperature gradients, we imposed various temperature gradients using asymmetric heat- ing. Considering hydrodynamically and thermally fully developed flow, the governing equations were reduced to two-point ordinary boundary value differential equations and were solved numerically. The imposed thermal asymmetry changed the direction of nanoparticle migration and distorted the velocity, temperature, and nanoparticle concentration profiles. Moreover, we found optimum values for the radius ratio （ζ） and heat flux ratio （ε）; with these optimum values, the nanofluid enhanced the efficacy of the system.

关键词： Nanofluid Nanoparticle migration Mixed convection Asymmetry heating Modified Buongiorno's mode

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Treatment of Vulvovaginal Candidiasis with A Strategy Based on Phototherapy (M.A.C.^® Scar Acceleration Method)

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Modern Research in Inflammation 2024年第1期13卷 1-7页

作者： Marcus Vinicius de Mello Pinto Karin Yuri Fernández Iturra Aline Ronis Sampaio María Elena Silva Álvarez Esteban fortuny Celulare Institute Petrópolis Brazil Bienus Clinic Santiago Chile Fisiocare Curicó Chile Universidad Finis Terrae Santiago Chile

Candidiasis, also known as candidiasis vulvovaginitis, is an infection caused by different types of Candida fungi, the most frequent being Candida albicans. The present study reports an effective strategy, which opens new avenues for the treatment of this public health problem. The MAC® Methodology, conventional laser light-emitting (LLLT)/LEd) methods are based on the biphasic response demonstrated many times in LLLT research and as with other forms of drugs, a “drug” (irradiation parameters) and a “dose” (irradiation times) and the “Arndt-Schulz Law” is often cited as a suitable model to describe the dose-dependent effects of LLLT. This method uses photopharmaceuticals, cell markers and the use of correct parameters for each case to induce the acceleration of tissue repair. The present study shows a case of a 32-year-old patient diagnosed with recurrent candidiasis 4 years ago. Eighteen sessions were performed (every other day) using a photoactivated component (Methylene blue 1% + Clotrimazole 1%) and LEd phototherapy (red, blue and violet) with emission times of 60 - 260 seconds for each applicator, according to the dose recommendations of the scar acceleration method (MAC®). At the sixth treatment session there was a noticeable decrease in the itching sensation reported by the patient. In session 11 she reported feeling a great improvement, indicating that she no longer felt itching in any area after 18 sessions. The present case demonstrates new methodologies to treat common problems in the population that have a positive impact on the quality of life. This methodology has a promising future because it is non-invasive and requires a great biological transformation for inflammatory, fungal and viral control.

关键词： Treatment of vulvovaginal Candidiasis Candidiasis Candida M.A.C. MAC®

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Rethinking the solar flare paradigm

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Plasma Science and Technology 2018年第7期20卷 15-21页

作者： d b melrose SIfA School of PhysicsThe University of SydneyNSW 2006Australi

It is widely accepted that solar flares involve release of magnetic energy stored in the solar corona above an active region, but existing models do not include the explicitly time-dependent electrodynamics needed to describe such energy release. A flare paradigm is discussed that includes the electromotive force （EMF） as the driver of the flare, and the flare-associated current that links different regions where magnetic reconnection, electron acceleration, the acceleration of mass motions and current closure occur. The EMF becomes localized across regions where energy conversion occurs, and is involved in energy propagation between these regions.

关键词： solar flares electrodynamics time-dependence

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Parallel Perturbed Gauss-Newton State Estimator Based on Fortescue Transformation for Unbalanced Power Systems

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1778-1783页

作者： Izudin džafić Faculty of Electrical Engineering University of SarajevoSarajevo 71000Bosnia and Herzegovina

This letter extends the complex-variable perturbed Gauss-Newton method to estimate the state of unbalanced power systems by exploiting the Fortescue *** proposes a novel and efficient graph-based way to deal with singularities due to zero-sequence network parts bounded with delta transformer windings and isolated from the *** estimator can handle both phasor and complex power *** with the standard complex-variable unbalanced state estimator,it achieves better numerical stability and a speed-up of around three times using a sequential implementation and five times using parallel execution.

关键词： delta-windings Fortescue transformation iterative algorithms least-squares approximation parallel algorithm perturbation methods ill-conditioning state estimation symmetrical components

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The sexually dimorphic expression of glutamate transporters and their implication in pain after spinal cord injury

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Neural Regeneration Research 2025年第11期20卷 3317-3329页

作者： Jennifer M.Colón-Mercado Aranza I.Torrado-Tapias Iris K.Salgado Jose M.Santiago Samuel E.Ocasio Rivera dina P.Bracho-Rincon Luis H.Pagan Rivera Jorge d.Miranda department of Physiology University of Puerto RicoMedical Sciences CampusSan JuanPRUSA National Institutes of Health National Human Genome Research InstituteBethesdaMDUSA Universidad Central del Caribe School of MedicineBayamónPRUSA University of Puerto Rico Carolina CampusCarolinaPRUSA Institute of Neurobiology San JuanPRUSA

In addition to the loss of motor function,~60% of patients develop pain after spinal cord *** cellular-molecular mechanisms are not well understood,but the data suggests that plasticity within the rostral,epicenter,and caudal penumbra of the injury site initiates a cellularmolecular interplay that acts as a rewiring mechanism leading to central neuropathic *** can lead to the formation of new connections triggering abnormal sensory *** excitatory glutamate transporters are responsible for the reuptake of extracellular glutamate which makes them a critical target to prevent neuronal hyperexcitability and *** previous studies showed a sexually dimorphic therapeutic window for spinal cord injury after treatment with the selective estrogen receptor modulator *** this study,we investigated the anti-allodynic effects of tamoxifen in male and female rats with spinal cord *** hypothesized that tamoxifen exerts anti-allodynic effects by increasing the expression of glutamate transporters,leading to reduced hyperexcitability of the secondary neuron or by decreasing aberrant *** and female rats received a moderate contusion to the thoracic spinal cord followed by subcutaneous slow-release treatment of tamoxifen or matrix pellets as a control(placebo).We used von Frey monofilaments and the“up-down method”to evaluate mechanical *** treatment decreased allodynia only in female rats with spinal cord injury revealing a sexdependent *** expression profile of glutamatergic transporters(excitatory amino acid transporter 1/glutamate aspartate transporter and excitatory amino acid transporter 2/glutamate transporter-1)revealed a sexual dimorphism in the rostral,epicenter,and caudal areas of the spinal cord with a pattern of expression primarily on *** rodents showed a significantly higher level of excitatory amino acid transporter-1 expression while male rodents showed increased

关键词： allodynia central neuropathic pain EAAT-1/GLAST EAAT-2/GLT-1 glutamate transporters selective estrogen receptor modulator sexual dimorphism spinal cord injury trauma

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