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Validity of a noninvasive estimation of deep body temperature when wearing personal protective equipment during exercise and recovery

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Military Medical Research 2019年第4期6卷 328-339页

作者： Andrew P.Hunt Mark J.Buller Matthew J.Maley Joseph T.Costello ian B.stewart School of Exercise and Nutrition Sciences&Institute of Health and Biomedical Innovation Queensland University of TechnologyBrisbaneQLDAustralia United States Army Research Institute of Environmental Medicine NatickMAUSA Extreme Environments Laboratory Department of Sport and Exercise ScienceUniversity of PortsmouthPortsmouthUK

Background:Deep body temperature is a critical indicator of heat ***,direct measures are often invasive,costly,and difficult to implement in the *** study assessed the agreement between deep body temperature estimated from heart rate and that measured directly during repeated work bouts while wearing explosive ordnance disposal(EOD)protective clothing and during ***:Eight males completed three work and recovery periods across two separate *** consisted of treadmill walking on a 1%incline at 2.5,4.0,or 5.5 km/h,in a random order,wearing EOD protective *** temperature and relative humidity were maintained at 24℃and 50%[Wet bulb globe temperature(WBGT)(20.9±1.2)℃]or 32℃and 60%[WBGT(29.0±0.2)℃]on the separate days,*** rate and gastrointestinal temperature(TGI)were monitored continuously,and deep body temperature was also estimated from heart rate(ECTemp).Results:The overall systematic bias between TGI and ECTemp was 0.01℃with 95%limits of agreement(Lo A)of±0.64℃and a root mean square error of 0.32℃.The average error statistics among participants showed no significant differences in error between the exercise and recovery periods or the environmental *** TGI levels of(37.0–37.5)℃,(37.5–38.0)℃,(38.0–38.5)℃,and>38.5℃,the systematic bias and±95%Lo A were(0.08±0.58)℃,(–0.02±0.69)℃,(–0.07±0.63)℃,and(–0.32±0.56)℃,***:The findings demonstrate acceptable validity of the ECTemp up to 38.5℃.Conducting work within an ECTemp limit of 38.4℃,in conditions similar to the present study,would protect the majority of personnel from an excessive elevation in deep body temperature(>39.0℃).

关键词： Protective clothing Body core temperature Heat strain Heat stress Kalman filter Explosive ordnance disposal

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A 30% incidence of renal cysts with varying sizes and densities in biomedical research swine is not associated with renal dysfunction

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Animal Models and Experimental Medicine 2020年第3期3卷 273-281页

作者： Belinda I.Gómez Joshua S.Little Alisa J.Leon ian J.stewart David M.Burmeister United States Army Institute of Surgical Research JBSA Fort Sam HoustonTXUSA David Grant US Air Force Medical Center Travis Air Force BaseCAUSA Uniformed Services University of the Health Sciences BethesdaMDUSA

Background:Renal cystic disease arising from various etiologies results in fluid-filled cavities within the ***,preexisting renal dysfunction has been shown to exacerbate multiple *** swine bred for biomedical research are often clinically inspected for illness/parasites,more advanced diagnostics may aid in uncovering underlying renal ***:Computed tomography was performed in 54 female prepubertal Yorkshire swine to characterize renal cysts;urine and blood chemistry,and histology of cysts were also ***:Digital reconstruction of right and left kidneys demonstrated that roughly one-third of the animals(17/54;31%)had one or more renal *** biomarkers of renal function were not different between animals that had cysts and those that did ***,urinary glucose(P=.03)was higher and sodium(P=.07)tended to be lower in animals with cysts compared to animals without,with no differences in protein(P=.14)or potassium(P=.20).Aspiration of cystic fluid was feasible in two animals,which revealed that the cystic fluid urea nitrogen(97.6±28.7 vs 911.3±468.2 mg/dL),potassium(29.8±14.4 vs 148.2±24.85 mmol/L),uric acid(2.55±1.35 vs 11.4±5.65 mg/dL),and creatinine(60.34±17.26 vs 268.99±95.79 mg/dL)were much lower than in the *** demonstrated a cyst that markedly compresses the adjacent cortex and is lined by a single layer of flattened epithelium,bounded by fibrous connective tissue which extends into the *** is tubular atrophy and loss in these ***:This study provides valuable insight for future studies focusing on kidney function in swine bred for biomedical research.

关键词： computed tomography cyst kidney renal dysfunction swine

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几何快速分解因子法

世界科学 1989年第9期 2-3页

作者： ian stewart 姚时宗

每一个整数,在理论上都能被分解为素因子.但要做到这一点,所费时间可能超过宇宙存在的期限.用初等易见的方法,即逐个地用素数试除它,直除到此数的平方根为止,是无望的。它的运算时间增长得如此之快,举例说,如果将计算机运算速度加快100... 详细信息

每一个整数,在理论上都能被分解为素因子.但要做到这一点,所费时间可能超过宇宙存在的期限.用初等易见的方法,即逐个地用素数试除它,直除到此数的平方根为止,是无望的。它的运算时间增长得如此之快,举例说,如果将计算机运算速度加快100倍,也只能使所能处理的数字的大小略加几个数位。要分解一个250位的数——如果不是那种特殊形式易于分解的数——现在是不可能做到的。另一方面,还未有人证明素数分解真应当如那样

关键词：椭圆曲线波拉德代数曲线公开密码素因子

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辛拓扑

世界科学 1989年第9期 1-2页

作者： ian stewart 姚时宗

物质运动是数学概念的最丰富的泉源之一。我们可以找到一条连续的线索,从伽里略的实验和开普勒的经验定律,经过牛顿、拉格朗日以及哈密顿的光学力学相似理论,贯穿至今日数学的一大主流部分。从力学发展到微分方程、以至流形、李群和测... 详细信息

物质运动是数学概念的最丰富的泉源之一。我们可以找到一条连续的线索,从伽里略的实验和开普勒的经验定律,经过牛顿、拉格朗日以及哈密顿的光学力学相似理论,贯穿至今日数学的一大主流部分。从力学发展到微分方程、以至流形、李群和测度论。振子的正规模式导致二次型和线性代数。热传导和波动导致富利叶级数和函数分析。但是在所有数学概念中潜在的最有前景的一个概念,目前仅为数学家和理论物理家们所知晓。它受到哈密顿一般力学形式的儿柯解释的发扬,这种深奥的几何被引述为"辛"(Symplectic)几何。

关键词：辛几何物质运动哈密顿光学开普勒经验定律一般力学函数分析级数和数学数学概念

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紊乱动力学的算术