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A framework for dynamic modelling of railway track switches considering the switch blades,actuators and control systems

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Railway Engineering Science 2024年第2期32卷 162-176页

作者： Saikat Dutta Tim harrison Christopher ward Roger Dixon Phil Winship Institute of Thermofluids School of Mechanical EngineeringUniversity of LeedsLeedsWest YorkshireUK Wolfson School of Mechanical Electrical and Manufacturing EngineeringLoughborough UniversityLoughboroughLeicestershireUK Birmingham Centre for Railway Research and Education School of EngineeringUniversity of BirminghamBirminghamWest MidlandsUK Network Rail Milton KeynesBuckinghamshireUK

The main contribution of this paper is the development and demonstration of a novel methodology that can be followed to develop a simulation twin of a railway track switch system to test the functionality in a digital *** is important because,globally,railway track switches are used to allow trains to change routes;they are a key part of all railway ***,because track switches are single points of failure and safety-critical,their inability to operate correctly can cause significant delays and concomitant *** order to better understand the dynamic behaviour of switches during operation,this paper has developed a full simulation twin of a complete track switch *** approach fuses finite element for the rail bending and motion,with physics-based models of the electromechanical actuator system and the control ***,it provides researchers and engineers the opportunity to explore and understand the design space around the dynamic operation of new switches and switch machines before they are *** is useful for looking at the modification or monitoring of existing switches,and it becomes even more important when new switch concepts are being considered and *** simulation is capable of running in real time or faster meaning designs can be iterated and checked *** paper describes the modelling approach,demonstrates the methodology by developing the system model for a novel“REPOINT”switch system,and evaluates the system level performance against the dynamic performance requirements for the *** the context of that case study,it is found that the proposed new actuation system as designed can meet(and exceed)the system performance requirements,and that the fault tolerance built into the actuation ensures continued operation after a single actuator failure.

关键词： Railway track switch Mathematical modelling Redundant actuation Finite element analysis

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家庭中杀虫剂浓度的时间变异性和对流行病学研究中衰减偏倚的启示

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环境与职业医学 2013年第8期30卷 647-647页

作者： Nicole C.Deziel mary h.ward Erin M.Bell Todd P.Whitehead Robert B.Gunier Melissa C.Friesen John R.Nuckols

[背景]已证实住宅杀虫剂暴露与成人和儿童的不良健康结局相关。高质量的暴露评估是确认这些关联的关键。以往的流行病学研究采用一次测量地毯灰尘中杀虫剂浓度来描述个体长期暴露的平均值。如果浓度随着时间的推移而变化，那么这种方法... 详细信息

[背景]已证实住宅杀虫剂暴露与成人和儿童的不良健康结局相关。高质量的暴露评估是确认这些关联的关键。以往的流行病学研究采用一次测量地毯灰尘中杀虫剂浓度来描述个体长期暴露的平均值。如果浓度随着时间的推移而变化，那么这种方法会导致对暴露明显的错误分类，削弱对风险的估计。[目的]评估地毯灰尘样本中杀虫剂浓度的可重复性和流行病学研究中依赖于一个样本的潜在衰减偏倚。[方法]在2003-2005年期间，从加州Fresno县的21个家庭中，重复收集地毯灰尘样本（中位数=3，范围1～7）。使用气相色谱-质谱法分析灰尘中的13种杀虫剂；采用混合效应模型估计家庭之间和家庭内的方差。计算每一种杀虫剂的组内相关系数（ICC），并估计收集单次灰尘样品的假设病例对照研究衰减回归系数。[结果]ICC的中位数为0．73（范围0．37—0．95），表明大多数杀虫剂家庭之间的变异性高于家庭内部的变异性。对于13种化合物中进行评估的7种，与使用单一灰尘样本相关的预期衰减偏倚估计为≤30％。[结论]对于研究的几种杀虫剂，使用一个灰尘样本代表约为2年的暴露期，其比值比不会大幅衰减。还需要进一步研究，以确定上述研究结果是否可以代表更长的暴露时间并且适用于其他杀虫剂。

关键词：灰尘环境暴露杀虫剂信度

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A flexible,thin-film microchannel electrode array device for selective subdiaphragmatic vagus nerve recording

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Microsystems & Nanoengineering 2024年第1期10卷 115-128页

作者： Jongcheon Lim Peter A.Zoss Terry L.Powley hyowon Lee Matthew P.ward Weldon School of Biomedical Engineering Purdue UniversityWest LafayetteINUSA Birck Nanotechnology Center Purdue UniversityWest LafayetteINUSA Center for Implantable Devices Purdue UniversityWest LafayetteINUSA Department of Psychological Sciences Purdue UniversityWest LafayetteINUSA Purdue Institute of Integrative Neuroscience Purdue UniversityWest LafayetteINUSA Indiana University School of Medicine IndianapolisINUSA

The vagus nerve(VN)plays an important role in regulating physiological conditions in the gastrointestinal(GI)tract by communicating via the parasympathetic pathway to the enteric nervous system(ENS).however,the lack of knowledge in the neurophysiology of the VN and GI tract limits the development of advanced treatments for autonomic dysfunctions related to the *** better understand the complicated underlying mechanisms of the VN-GI tract neurophysiology,it is necessary to use an advanced device enabled by microfabrication *** several candidates including intraneural probe array and extraneural cuff electrodes,microchannel electrode array devices can be used to interface with smaller numbers of nerve fibers by securing them in the separate channel *** microchannel electrode array devices to interface teased nerve structures are relatively bulky with thickness around 200µ*** thick design can potentially harm the delicate tissue structures,including the nerve *** this paper,we present a flexible thin film based microchannel electrode array device(thickness:11.5µm)that can interface with one of the subdiaphragmatic nerve branches of the VN in a *** demonstrated recording evoked compound action potentials(ECAP)from a transected nerve ending that has multiple nerve ***,our analysis confirmed that the signals are from C-fibers that are critical in regulating autonomic neurophysiology in the GI tract.

关键词： electrode recording film

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Prader-Willi Syndrome and the Use of Medical Nutrition Therapy

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Case Reports in Clinical Medicine 2024年第8期13卷 339-344页

作者： Alexis howarth Cameron Carroll Madison Battersby Stephen Brown JuliSu DiMucci-ward Department of Nutrition Edward Via College of Osteopathic Medicine Spartanburg South Carolina USA

Title: Integrating Consistent Individualized Carbohydrate-Controlled Anti- Inflammatory Nutritional Plan (C-ICAN) in the Management of Prader-Willi Syndrome: A Case Report. Prader–Willi syndrome (PWS) is a rare genetic disorder caused by a loss of function of specific genes on chromosome 15. Patients with this disease present unique challenges in management, particularly regarding obesity and nutritional regulation as the disease symptoms change depending on the age of the patient and the phase of the disease. These challenges pose critical stressors to caregivers and their families. We present a case report of a 5-year-old Caucasian male diagnosed with PWS, exhibiting failure to thrive and uncontrolled weight gain. his caregiver was his elderly grandmother who, by her own admission, was ill-equipped to deal with the patient’s physical symptoms and his behavior in response to dietary restrictions. Through a multidisciplinary approach involving medical nutrition therapy (MNT) involving the implementation of a Consistent Individualized Carbohydrate-Controlled Anti-Inflammatory Nutritional plan (C-ICAN), growth hormone supplementation, and behavioral interventions patient markedly improved physically and emotionally.

关键词： Prader-Willi Syndrome Growth hormone Medical Nutrition Therapy Eating Control Obesity

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Wind Turbine Noise Reduction through Blade Retrofitting

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Open Journal of Modelling and Simulation 2024年第3期12卷 75-88页

作者： Sarah Seevers Robin ward Scotty hutto Darryl house Nick Zelenka Manuel Perea Daniel Fonseca Department of Mechanical Engineering The University of Alabama Tuscaloosa USA

This paper outlines a plan for the effective reduction of the audible sound level produced by aerodynamic noise from the power-generating turbine blades. The contribution of aerodynamic noise can be divided into two categories: inflow turbulence and airfoil self-noise. The base model and retrofit blade designs were modeled in SolidWorks. Subsequently, noise prediction simulations were conducted and compared to the base blade model to determine which modification provided the greatest benefit using SolidWorks Flow Simulation. The result of this project is a series of blade retrofit recommendations that produce a more acoustically efficient design and reduce noise complaints while enabling turbines to be placed in locations that require quieter operations.

关键词： Wind Turbine Noise Blade Retrofitting Aerodynamic Noise Electricity Generation

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“Active Feedback” Fitbit-Based Physical Activity and Sleep hygiene Intervention for Memory Assessment Service (MAS) Patients with Cognitive Deficits: Feasibility, Acceptability, Sleep Quality, Stress, and Wellbeing Outcomes

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Advances in Aging Research 2024年第4期13卷 61-74页

作者： Chris Griffiths Farah hina Chee Siang Ang Louise Birkett-Swan Casey Bonham Lauren Currell Emily ward Natasha Stace-Wood Jessica Plumbridge Northamptonshire healthcare NhS Foundation Trust Northampton UK School of Computing University of Kent Canterbury UK

Research Background: Compared to the general population, people experiencing age-related cognitive decline are more likely to have low levels of physical activity and sleep problems. Sufficient physical activity and quality sleep are protective factors against cognitive decline and poor health and can improve coping with stressors. The “Active Feedback” intervention comprises a wearable activity and sleep tracker (Fitbit), access to Fitbit software healthy lifestyle software apps;one session with Memory Assessment Service (MAS) staff providing physical activity and sleep hygiene advice and two further engagement, discussion, and feedback sessions. Purpose/Aim: This study investigates the acceptability and feasibility of Active Feedback and the effect on stress, mental wellbeing, and sleep quality, and the links between these factors. Methods: An open-label patient cohort design with no control group was used. Pre-intervention, 4-week and 8-week intervention assessments were performed using participant self-report measures: Perceived Stress Scale (PSS), Warwick-Edinburgh Mental Wellbeing Scale (WEMWBS), and Sleep Conditioning Index (SCI). Twenty-five participants completed an eight-week three-session intervention (18 males and 7 females), with the age range of 66 - 84 years old, and average age of 73.8 years (SD = 5.09). Fifteen participants had a diagnosis of MCI, ten participants did not. Results: There were non-significant improvements in SCI scores from 21.0 (SD = 8.84) to 21.6 (SD = 6.20) at 8 weeks, PSS scores from 17.5 (SD = 5.89) to 17.0 (SD = 6.20) at 8 weeks, and WEMWBS scores from 46.9 (SD = 9.23) to 48.8 (SD = 9.69) at 8 weeks. There were negative correlations between WEMWBS and PSS. Conclusion: Active Feedback intervention was found to be feasible and acceptable. Active Feedback could be enhanced to include motivational interviewing and goal setting.

关键词： Fitbit Tracker MCI Exercise Insomnia Physical Activity Wearables Sleep

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Magnetic field induction and magnetic force distribution profiles in plasma focus discharge device

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Plasma Science and Technology 2021年第7期23卷 110-120页

作者： A A LAShIN T M ALLAM h A EL-SAYED Kamal M AhMED S A ward h M SOLIMANand M A ABOUELATTA Plasma and Nuclear Fusion Department Nuclear Research CentreEgyptian Atomic Energy AuthorityInshas 13759Egypt Faculty of Engineering Delta University for Science and TechnologyGamasa 11152Egypt Electrical Engineering Department Faculty of Engineering at ShoubraBenha UniversityCairo 11629Egypt

We report a simple-to-perform technique to investigate the distribution of the azimuthal magnetic field induction,Bθ,and the induced magnetic force acting on the plasma current sheath(PCS)in a plasma focus(PF)*** in situ measurement technique can undoubtedly be beneficial when other fast-imaging techniques are not *** are not *** work was conducted in the low-energy Mather-type EAEA-PF1 device operated in *** axial distribution(Bθ)z along the coaxial electrodes system was measured with a four magnetic-probe set technique at different radial distances(r=2.625×10^(−2) to 4.125×10^(−2) m)within the annular space between the coaxial electrodes during the 1st and 2nd half cycles of the discharge current waveform,where inner electrode of coaxial electrode system has a+ve polarity and−ve polarity,***,radial and total magnetic force distribution profiles were estimated from Bθ*** of PCS shape in terms of its inclination(curvature)angle,θ,along the axial rundown phase and the correlation between the magnetic forces per unit volume acting on the PCS,the inclination angleθof the PCS,and the formation of a powerful PF action during the 1st and 2nd half cycles is carried *** of inclination angle,θ,on total magnetic force per unit volume acting on PCS axial motion was studied,separately,during the 1st and 2nd half cycles.

关键词： plasma focus azimuthal magnetic field magnetic force inclination angle plasma current sheath

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Use of tree species by three species of Magicicada(hemiptera:Cicadidae)in an Appalachian forest

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林业研究:英文版 2023年第6期34卷 2051-2063页

作者： Cindy Perkovich David ward Department of Biology and Toxicology Ashland UniversityAshlandOH 44805USA Department of Biological Sciences Kent State UniversityKentOH 44242USA

Periodical cicadas(Magicicada spp.)are endemic to deciduous forests in the eastern United *** successional forests,they must partition resources such as host trees to *** measured tree size,emergence holes,oviposition scar bundles,and chorusing center abundances of Magicicada species on 12 common tree species in a deciduous forest to understand host-tree *** predicted that the abundance of periodical cicadas and use of specific host-tree species would change depending on the Magicicada species and tree life *** considered the size of the tree(diameter at breast height)as a covariate to control for tree size and collected eggs for a greenhouse experiment to assess whether nymphs prefer to feed on Quercus rubra or Acer *** emergence holes were found below Quercus species than any other tree *** abundance of periodical cicadas on host trees used for chorusing centers varied depending on the Magicicada species,but were most abundant on Quercus *** scar bundles were also more frequent on *** nymphs were found on Quercus than Acer in the nymph preference *** periodical cicadas used Quercus hosts more than other tree species,their abundances on different host tree sizes and species differed *** cicada species may use specific host species and life stages as a way to partition resources and minimize competition among the Magicicada species during emergence years.

关键词： Ecological succession habitat partitioning Periodical cicadas Successional forests

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Comparing outcomes from the two most recognized acupuncturist workforce surveys

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Journal of Integrative Medicine 2017年第1期15卷 37-43页

作者： Steven h. Stumpf Kory ward-Cook Clifford R. Carr health Administration Program California State University at NorthridgeNorthridgeCalifornia 91330USA National Certification Commission of Acupuncture and Oriental Medicine JacksonvilleFlorida 32202USA Clifford R.Carr 1743 PenmarAvenue#3VeniceCalifornia 90291USA

OBJECTIVE： To determine the informational consistency produced by the two most recent independent surveys and draw a conclusion whether the data would be sufficient for the National Center for health Workforce Analysis and Bureau of Labor and Statistics consideration. METhODS： This paper compares workforce outcomes collected by the two most prominent acupuncture entities that have produced the most useful acupuncturist workforce data （California Acupuncture Board 2015 Occupational Analysis and the National Certification Commission of Acupuncture and Oriental Medicine^2013 Job Analysis） at national and state levels. RESULTS： Findings based upon the most compatible survey questions showed the following： more than 70% of acupuncturists work fewer than 40 hours weekly; approximately 76% work in solo practice or in shared space with other acupuncturists; more than 70% of the national sample have been in practice 15 years or less; and median income is between $40 000 and $50 000. A preponderance of acupuncturists is less than 50 years of age, and fewer than 15% of all respondents have been in practice more than 20 years. CONCLUSION： Basic workforce information is a necessary precursor for conducting workforce projections. It is useful to track the expansion or contraction of any given profession. Tracking influences subsequent planning for the profession based upon reliable and valid information about its growth. The ability of the profession to collect its own workforce data is paramount to workforce projection models. Any future survey should be a shared project that follows guidelines supported by the National Center for health Workforce Analysis.

关键词： acupuncture workforce survey outcome assessment (health care) income

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共同努力:为受污染财产的治理和再开发融资

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产业与环境 2000年第1期22卷 20-23页

作者： Elizabeth h.ward 牛志强 Washington Advisors

地方政府和投资商需共同努力 ,以鼓励和促进“褐色地带”场所的治理、再开发和充分利用 .在美国过去的几年中 ,存在着一种制订“风险治理标准和自愿治理计划”的趋势 ,以鼓励这些场所的再利用 .最近 ,地方政府和私营保险公司提供的“有... 详细信息

地方政府和投资商需共同努力 ,以鼓励和促进“褐色地带”场所的治理、再开发和充分利用 .在美国过去的几年中 ,存在着一种制订“风险治理标准和自愿治理计划”的趋势 ,以鼓励这些场所的再利用 .最近 ,地方政府和私营保险公司提供的“有效债务保护”有利于这种趋势的发展 .本文考虑了各种受污染财产的治理和再开发的融资方法 .

关键词：受污染财产污染治理再开发融资

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