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Feasibility of the 2-point method to determine the load-velocity relationship variables during the countermovement jump exercise

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journal of Sport and Health Science 2023年第4期12卷 544-552,F0003页

作者： Alejandro Pérez-Castilla Rodrigo ramirez-Campillo john F.T.Fernandes Amador García-Ramos Department of Physical Education and Sport Faculty of Sport SciencesUniversity of GranadaGranada 18011Spain Human Performance Laboratory Department of Physical Activity SciencesUniversidad de Los LagosSantiago 5170000Chile Centro de Investigacion en Fisiologıa del Ejercicio Facultad de CienciasUniversidad MayorSantiago 8580745Chile Higher Education Sport Hartpury UniversityHartpury GL193BEUK Department of Sports Sciences and Physical Conditioning Faculty of EducationUniversidad Catolica de la Santısima ConcepcionConcepcion 4090541Chile

Purpose:This study aimed to examine the reliability and validity of load-velocity(L-V)relationship variables obtained through the 2-point method using different load combinations and velocity ***:Twenty men performed 2 identical sessions consisting of 2 countermovement jumps against 4 external loads(20 kg,40 kg,60 kg,and80 kg)and a heavy squat against a load linked to a mean velocity(MV)of 0.55 m/s(load_(0.55)).The L-V relationship variables(load-axis intercept(L_(0)),velocity-axis intercept(v_(0)),and area under the L-V relationship line(A_(line)))were obtained using 3 velocity variables(MV,mean propulsive velocity(MPV),and peak velocity)by the multiple-point method including(20-40-60-80-load_(0.55))and excluding(20-40-60-80)the heavy squat,as well as from their respective 2-point methods(20-load_(0.55)and 20-80).Results:The L-V relationship variables were obtained with an acceptable reliability(coefncient of variation(CV)≤7.30%;intra-class correlation coefficient>0.63).The reliability of L_(0)and v_(0)was comparable for both methods(CV_(ratio)(calculated as higher value/lower value):1.11-1.12),but the multiple-point method provided Al_(ine)with a greater reliability(CV_(ratio)=1.26).The use of a heavy squat provided the L-V relationship variables with a comparable or higher reliability than the use of a heavy countermovement jump load(CV_(ratio):1.06-1.19).The peak velocity provided the load-velocity relationship variables with the greatest reliability(CV_(ratio):1.15-1.86)followed by the MV(CV_(ratio):1.07-1.18),and finally the *** 2-point methods only revealed an acceptable validity for the MV and MPV(effect size≤0.19;Pearson s product-moment correlation coefficient≥0.96;Lin's concordance correlation coefficient≥0.94).Conclusion:The 2-point method obtained from a heavy squat load and MV or MPV is a quick,safe,and reliable procedure to evaluate the lower-body maximal neuromuscular capacities through the L-V relationship.

关键词： Force-velocity relationship Mean velocity Multiple-point method Peak velocity Velocity-based training

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Asymptomatic bacteriuria among hospitalized diabetic patients:Should they be treated?

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World journal of Meta-Analysis 2019年第7期7卷 339-342页

作者： Manuel j Ramos-ramirez Salim Surani Corpus Christi Medical Center Corpus ChristiTX 78412United States Medical Critical Care Services Christus Spohn Hospitals-Corpus ChristiCorpus ChristiTX 78413United States

Diabetes Mellitus is a significant health care challenge in the United *** Center for Disease Control and Prevention estimates approximately 9.4%of patients in the United States are afflicted by *** Infectious Disease Society of America asymptomatic bacteriuria in women as two consecutive cleancatch voided urine specimens with isolation of the same bacterial strain in counts≥105 cfu/mL It is understood that diabetic patients tend to be at higher risk for infections than *** tract infections(UTIs)tend to be the most common infection contracted by this *** are not only a significant cause of morbidity and mortality,they are also a significant financial *** data are conflicting,in regard to treating asymptomatic bacteriuria in diabetic patients to avoid hospital complications and ultimately decrease healthcare costs associated with these ***,clinicians continue to prescribe antibiotics *** randomized controlled study looking into the specific population as immunocompromised diabetic patients,patient with diabetic ketoacidosis and patient in intensive care unit needs to be undertaken.

关键词： Asymptomatic bacteriuria Diabetes mellitus Hospitalized diabetics Urinary tract infection

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Solid-liquid extraction for yttrium recovery using porous polymeric resin(XAD-7) functionalized with D_(2)EHPA

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journal of Rare Earths 2024年第9期42卷 1764-1773,I0005页

作者： P.A.Martínez-Montoya R.G.Sanchez-Alvarado D.Y.Medina-Velazquez M.L.Carrera-jota P.Garnica-Chávez A.de j.Morales-ramirez Higher School of Chemical Engineering and Extractive Industries ESIQIEIPNDepartment of Metallurgical EngineeringUPALM S/NCol.LindavistaGustavo A.Madero Cd.de MéxicoC.P07738Mexico Metropolitan Autonomous University Department of MaterialsBasic Sciences and EngineeringAv.San Pablo No.180Col.Reynosa TamaulipasCd.de MéxicoC.P02200Mexico Center for Research and Technological Innovation CIITECIPNCda.de CECATIs/nSanta CatarinaAzcapotzalcoC.P02250CDMXMexico

The recovery of yttrium is proposed by applying a solid-liquid extraction process using di-2-ethyl hexylphosphoric acid(D2EHPA) as extracting *** extracting agents were supported on a macro porous polymeric resin XAD-7(solid phase).Yttrium ions extraction and discharge tests were performed,firstly from a synthetic aqueous solution of 100 mg/L Y(liquid phase) at 25℃ with *** effects of pH of aqueous solutions bearing yttrium,volume fraction of extracting agents and the solid/liquid(S/L)ratio on the yttrium recovery were *** most favorable conditions for yttrium ions extraction are;20 vol% D_(2)EHPA functionalized resin,pH=1.5 and an S/L ratio of 10 mg/mL The discharge of yttrium ions was done under the same conditions of extraction stage,using a 2 mol/L [H_(2)SO_(4)] as stripping *** to 80% yttrium is extracted,while 75% yttrium is recovered in the striping *** all experiments,the reaction equilibrium is reached after 20 min,and the kinetics for the extraction stage was determined as a second-order ***,experiments were carried out to discharge the yttriumloaded resins,and it has been determined that the best pH value to strip the Y ions is *** tests of extraction and discharge for yttrium ions show that the functionalized resin can work at least five cycles without decreasing its ***,the proposed process was tested in a real solution with Y ions fro m a waste fluorescent la mp powder leached in H_(2)SO_(4),demonstrating the ability to effectively recover yttrium,separating it from various metals from the studied residue.

关键词： Yttrium recovery Rare earth solid-liquid extraction XAD-7 resin Fluorescent lamps recycling Solid-liquid kinetics extraction

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Engineering Improved Photosynthesis in the Era of Synthetic Biology

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Plant Communications 2020年第2期1卷 1-17页

作者： Willian Batista-Silva Paula da Fonseca-Pereira Auxiliadora Oliveira Martins agustin Zsogon Adriano Nunes-Nesi Wagner L.Araujo Departamento de Biologia Vegetal Universidade Federal de Vic¸osaVic¸osaMinas Gerais 36570-900Brazil

Much attention has been given to the enhancement of photosynthesis as a strategy for the optimization of crop *** traditional plant breeding is most likely reaching a plateau,there is a timely need to accelerate improvements in photosynthetic efficiency by means of novel tools and biotechnological *** emerging field of synthetic biology offers the potential for building completely novel pathways in predictable directions and,thus,addresses the global requirements for higher yields expected to occur in the 21st ***,we discuss recent advances and current challenges of engineering improved photosynthesis in the era of synthetic biology toward optimized utilization of solar energy and carbon sources to optimize the production of food,fiber,and fuel.

关键词： photosynthesis synthetic biology genetic engineering yield improvement targeted manipulation

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领导者–跟随者Thomson跳环系统的自抗扰控制设计(英文)

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控制理论与应用 2013年第12期30卷 1564-1572页

作者： Mario ramirez-NERIA josé L GARCIA-ANTONIO Hebertt j SIRA-ramirez Martin VELASCO-VILLA Rafael CASTRO-LINARES Depto. de Control Automatico Cinvestav Av. IPN 2508 C.E 07360 Mexico D.F. Seccion de Mecatronica Depto. de Ingenieria Electrica Cinvestav Av. IPN 2508 C.E 07360 Mexico D.E

将用电磁方法悬浮起来的一对环构成领导者–跟随者系统实现对光滑参考轨线的跟踪要求.这一任务通过设计具有对扰动进行在线估计与补偿功能的自抗扰控制器(ADRC)实现.本文设计方法与传统ADRC的主要不同在于领导者和跟随者的跟踪控制器设... 详细信息

将用电磁方法悬浮起来的一对环构成领导者–跟随者系统实现对光滑参考轨线的跟踪要求.这一任务通过设计具有对扰动进行在线估计与补偿功能的自抗扰控制器(ADRC)实现.本文设计方法与传统ADRC的主要不同在于领导者和跟随者的跟踪控制器设计都是基于平坦输出的线性化近似系统.超出线性化近似有效区域的大的高度偏差所导致的未知非线性则被视为扰动,这个扰动借助于线性扩张观测器进行在线估计并通过线性反馈控制器进行消除.实验结果检验了本文所提方法的有效性.

关键词： Thomson跳环自抗扰控制广义比例积分(GPI)观测器领导者-跟随者布局

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Carbon dioxide fixation into cyclic carbonates at room temperature catalyzed by heteroscorpionate aluminum complexes

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Green Chemical Engineering 2022年第3期3卷 280-287页

作者： Felipe de la Cruz-Martinez jose A.Castro-Osma agustin Lara-Sanchez Universidad de Castilla-La Mancha Departamento de Quimica InorganicaOrganica y Bioquimica-Centro de Innovacion en Quimica Avanzada(ORFEO-CINQA)Facultad de Ciencias y Tecnologias QuimicasCiudad Real13071Spain Instituto de Investigaciones Quimicas(IIQ) Departamento de Quimica Inorganica and Centro de Innovacion en Quimica Avanzada(ORFEO-CINQA)Consejo Superior de Investigaciones Cientificas(CSIC)and University of SevillaSevilla41092Spain Universidad de Castilla-La Mancha Departamento de Quimica InorganicaOrganica y Bioquimica-Centro de Innovacion en Quimica Avanzada(ORFEO-CINQA)Facultad de FarmaciaAlbacete02071Spain

Novel mono-and bimetallic scorpionate aluminum compounds have been designed and characterized by spec-troscopic *** organometallics complexes,in combination with tetrabutylammonium bromide as cocatalyst,displayed good catalytic activity for the cycloaddition of styrene oxide and CO_(2) under ambient *** the compounds tested,monometallic complex 3 featuring diethylamino groups showed the highest catalytic *** catalytic system catalyzed the formation of cyclic carbonate products from their corresponding epoxides at room temperature and 1 bar of CO_(2) pressure in the absence of a solvent in good yields and excellent selectivities.

关键词： CO_(2) Epoxides Cyclic carbonates Aluminum complexes

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通用机助制图系统的地图语言工具

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地图 1992年第4期 41-45页

作者： j.R.ramirez 黄洁

通过摄影测量方式生产数字地形图,现已得到了制图界的广泛接受。作为生产地形图的第三代数字制图系统(DMS)投放市场已经两年多了,其中之一就是通用计算机辅助制图系统(UCAMS)。UCAMS的理论基础是地图语言。象任何其他语言一样,地图语言... 详细信息

通过摄影测量方式生产数字地形图,现已得到了制图界的广泛接受。作为生产地形图的第三代数字制图系统(DMS)投放市场已经两年多了,其中之一就是通用计算机辅助制图系统(UCAMS)。UCAMS的理论基础是地图语言。象任何其他语言一样,地图语言有两项基本内容:字母系统和语法。本文讨论的是生产数字地形图开发的地图语言,并介绍地图字母和地图语法,以及地图语言工具的实例。

关键词：数字地形图机助制图语言

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Effects of positive end-expiratory pressure on intracranial pressure,cerebral perfusion pressure,and brain oxygenation in acute brain injury:Friend or foe?A scoping review

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journal of Intensive Medicine 2024年第2期4卷 247-260页

作者： Greta Zunino Denise Battaglini Daniel agustin Godoy IRCCS Ospedale Policlinico San Martino GenovaItaly Dipartimento di Scienze Diagnostiche e Chirurgiche Integrate Universitàdegli Studi di GenovaGenovaItaly Neurointensive Care Unit Sanatorio PasteurCatamarcaArgentina

Background Patients with acute brain injury(ABI)are a peculiar population because ABI does not only affect the brain but also other organs such as the lungs,as theorized in brain–lung crosstalk *** patients often require mechanical ventilation(MV)to avoid the complications of impaired respiratory function that can follow ABI;MV should be settled with meticulousness owing to its effects on the intracranial compartment,especially regarding positive end-expiratory pressure(PEEP).This scoping review aimed to(1)describe the physiological basis and mechanisms related to the effects of PEEP in ABI;(2)examine how clinical research is conducted on this topic;(3)identify methods for setting PEEP in ABI;and(4)investigate the impact of the application of PEEP in ABI on the *** The five-stage paradigm devised by Peters et *** expanded by Arksey and O'Malley,Levac et al.,and the joanna Briggs Institute was used for *** also adhered to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses(PRISMA)extension *** criteria:we compiled all scientific data from peer-reviewed journals and studies that discussed the application of PEEP and its impact on intracranial pressure,cerebral perfusion pressure,and brain oxygenation in adult patients with *** criteria:studies that only examined a pediatric patient group(those under the age of 18),experiments conducted solely on animals;studies without intracranial pressure and/or cerebral perfusion pressure determinations,and studies with incomplete *** authors searched and screened for inclusion in papers published up to july 2023 using the PubMed-indexed online *** were presented in narrative and tubular *** The initial search yielded 330 references on the application of PEEP in ABI,of which 36 met our inclusion *** has recognized beneficial effects on gas exchange,but it produces hemodynamic changes that should be predicted to avoi

关键词： Acute brain injury Mechanical ventilation Positive end-expiratory pressure Intracranial pressure Brain-lung crosstalk Multimodal monitoring

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Body weight and range usage affect net energy utilisation in commercial free-range laying hens when evaluated in net energy chambers

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Animal Nutrition 2020年第2期6卷 192-197页

作者： Manisha Kolakshyapati Shu-Biao Wu Terence Z.Sibanda Santiago ramirez-Cuevas Isabelle Ruhnke The School of Environmental and Rural Science Faculty of ScienceAgricultureBusiness and LawUniversity of New EnglandArmidale2351NSWAustralia FCR Consulting Group Brisbane4000QLDAustralia

Within a given free-range flock,some hens prefer to spend the majority of their time in the shed(stayers),while others frequently access the range(rangers).Laying performance has been associated not only with the development of these sub-populations but also with different body weights(BW).The purpose of this study was to determine if range usage,BW or a combination of both is associated with energy metabolism and as such co ntribute to improved hen ***-eight Lohmann Brown hens at 74 wk of age were selected from a commercial free-range farm based on their BW and range usage over a 56-week *** a 2 × 2 factorial arrangement,hens were either classified as heavy(mean ± SEM;2.01±0.02 kg,n=24) or light(1.68±0,01 kg,n=24),and also classified as rangers(accessed the range for 84.1 % of available days,242±3.75 d;n=24) or stayers(accessed the range for 7.17% of available days;23,4±6.08 d,n=24).Stayers had significantly higher metabolizable energy(ME) intake per metabolic BW per d(0.852 vs.0.798 Mj/kg BW0.75 perd;P=0.025),higher heat production(0.637 vs.0.607 Mj/kg BW0.75 perd;P=0.005),higher heat increment(0.267 vs.0.237 Mj/kg BW0.75 per d;P=0.005) and retained more nitrogen(1.59 vs.1.46 g/hen perd;P=0.023) compared to the *** hens had significantly higher metabolic energy intake per metabolic BW(0.854 vs.0.796 Mj/kg BW0.75 per d;P=0.018),net energy(NE) intake(0.595 vs.0.551 Mj/kg BW0.75 per d;P=0.032),and retained energy(0.225 vs.0.181 Mj/kg BW0.75 per d;P=0.032),as well as lower heat production(0.936 vs.1.003 Mj/hen per d;P=0.002) compared to heavier *** interaction was observed across levels of analysis *** light stayers and light *** light rangers had significantly higher NE intake compared to the light stayers(9.77 vs.9.27 Mj/kg BW0.75 per d;P=0.024).In conclusion,light hens were more energy efficient compared to heavy ***,light rangers had a more efficient feed utilisation compared to the light stayers.

关键词： Egg production Health Husbandry Metabolizable energy Poultry nutrition Welfare

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Modelling the long-term geomorphic response to check dam failures in an alpine channel with CAESAR-Lisflood

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International journal of Sediment Research 2022年第5期37卷 687-700页

作者： jorge Alberto ramirez Mirjam Mertin Nadav Peleg Pascal Horton Chris Skinner Markus Zimmermann Margreth Keiler Institute of Geography University of Bern Oeschger Centre for Climate Change Research University of Bern Institute of Environmental Engineering ETH Zurich Institute of Earth Surface Dynamics University of Lausanne Energy and Environment Institute University of Hull Department of Geography University of Innsbruck Institute for Interdisciplinary Mountain Research Austrian Academy of Sciences

Globally, between 1950 and 2011 nearly 80,000 debris flow fatalities occurred in densely populated regions in mountainous terrain. Mitigation of these hazards includes the construction of check dams,which limit coarse sediment transport and in the European Alps number in the 100,000s. Check dam functionality depends on periodic, costly maintenance, but maintenance is not always possible and check dams often fail. As such, there is a need to quantify the long-term(10-100 years) geomorphic response of rivers to check dam failures. Here, for the first time, a landscape evolution model(CAESARLisflood) driven by a weather generator is used to replicate check dam failures due to the lack of maintenance, check dam age, and flood occurrence. The model is applied to the Guerbe River,Switzerland, a pre-Alpine catchment containing 73 check dams that undergo simulated failure. Also presented is a novel method to calibrate CAESAR-Lisflood?s hydrological component on this ungauged catchment. Using 100-year scenarios of check dam failure, the model indicates that check dam failures can produce 8 m of channel erosion and a 322% increase in sediment yield. The model suggests that after check dam failure, channel erosion is the remobilization of deposits accumulated behind check dams, and, after a single check dam failure channel equilibrium occurs in five years, but after many check dam failures channel equilibrium may not occur until 15 years. Overall, these findings support the continued maintenance of check dams.

关键词： Landscape evolution model Check dam failure Weather generator Natural hazards

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