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The Impact of sleep-Wake Behaviour on Tennis Match Performance in Junior state Grade Tennis Players

Journal of science in sport and Exercise 2023年第2期5卷 156-166页

作者： Mitchell Turner Philipp beranek Ian C.Dunican Travis Cruickshank school of Medical and Health sciences Edith Cowan University270 Joondalup DrivePerthWA 6027Australia Centre for sleep science School of Human SciencesThe University of Western AustraliaPerthWA 6009Australia Centre for Precision Health School of Medical and Health SciencesEdith Cowan UniversityPerthAustralia Perron Institute for Neurological and Translational sciences PerthAustralia

Purpose To date,no study has investigated the extent to which sleep-wake behaviour(sWB)influences match performance in junior tennis players.This study aimed to assess the influence of sWB for the week and night before on match performance,particularly match analytics and activity.Methods This study recruited 10 junior state grade tennis players who wore an actigraphy device and completed a sleep diary for the week before their match on two separate occasions throughout their competition season.Players wore a global positioning system device to track their movement during matches,and an experienced tennis coach recorded players'match analytics.Results This study showed that the sleep fragmentation index was significantly lower the week before matches in females who had won than those who had lost.Additionally,the sleep fragmentation index was significantly lower the night before a given match than the week before.Only sleep fragmentation index and sleep latency significantly influenced match performance in junior tennis players.The percentage of second serves points won differed between match wins and losses for male players,while winners and forced errors differed for female players.Conclusion These findings provide a detailed profile of tennis match play in junior state grade players.Despite individual differences,reduced restlessness the night before a match coincides with increased match performance.

关键词： sleep fragmentation Tennis analytics Global positioning system sleep quality sleep duration

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Book review

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Chinese Journal of Acoustics 1996年第4期15卷 375-376页

作者： LeoL.beranek

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M1主战坦克的仿真模型(续二)

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国外坦克 1994年第8期 36-38页

作者： Bolt beranek Newman Inc 鲁刚

火控系统 sIMNET M1火控系统由目标观察、瞄准和发射105mm主炮所必需的部件组成。这些部件包括炮长主瞄准镜、车长用于观察的炮长主瞄准镜延伸部分、用于快速精确测距的激光测距仪和用于计算弹道曲线的弹道计算机。这些部件和炮塔稳定... 详细信息

火控系统 sIMNET M1火控系统由目标观察、瞄准和发射105mm主炮所必需的部件组成。这些部件包括炮长主瞄准镜、车长用于观察的炮长主瞄准镜延伸部分、用于快速精确测距的激光测距仪和用于计算弹道曲线的弹道计算机。这些部件和炮塔稳定系统相结合为M1提供了以较高精度从停止和行进间射击目标的能力。

关键词：火控系统瞄准镜弹道计算机激光测距仪行进间射击精确测距弹道曲线仿真模型稳定系统主战坦克

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M1主战坦克的仿真模型(续一)

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国外坦克 1994年第7期 28-33页

作者： Bolt beranek Newman Inc 张兵志

炮塔仿真炮塔仿真采用的坐标系统是: 1.炮塔坐标:指向炮塔的前方为y轴,右方为x轴,上方为z轴。炮塔坐标系统的z轴和底盘坐标系统的z轴重合。

关键词：坐标系统主战坦克 M1 仿真模型瞄准镜旋转矩阵矩阵变换转换函数正弦值传递函数

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Thermodynamic Performance and Flammability studies of Hydrocarbon Based Low Global Warming Potential Refrigerant Mixtures

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Journal of Thermal science 2022年第5期31卷 1487-1502页

作者： Nagarjuna KUMMA s s Harish KRUTHIVENTI Department of Mechanical Engineering Low Temperature LaboratoryNational Institute of TechnologyTiruchirappalliTrichy620015India

This paper presents a theoretical method to calculate the minimum inerting concentration(MIC)of binary and ternary blends(refrigerants)that are used in small refrigeration systems.MIC is the concentration of the dilutant which makes the flammable mixture into just non-flammable(at non-zero quenching potential).In this study,the refrigerant safety parameters such as flammability,Global Warming Potential(GWP)and performance(COP)are analyzed for twelve binary and thirteen ternary blends containing one flammable and two nonflammable(dilutant)components.Flammability investigation was carried out with the hydrocarbon refrigerants R290,R600,R600a each mixed with dilutants R227ea,R125,R245fa,R13I1 and R134a at different concentrations respectively.Two methods,thermal balance method(TBM)and modified thermal balanced method(MTBM),are used to estimate the MIC(which decides the flammable zone).Thirteen ternary blends were identified based on the MIC values estimated using MTBM.In the case of ternary blends,it was observed that the non-flammable zone is high for the compositions of the Mixture G,Mixture H and Mixture I.It was also estimated that the COPs of the proposed mixtures M22,M24,M25 and M27 are 4%greater than the COP of R134a(for the same operating conditions).Further,it was also understood that the corresponding GWP value is reduced by 90%to 97%for the mixtures(M21,M22,M24,M25 and M27)when compared to R134a(GWP=1300).Therefore,out of the thirteen proposed ternary mixtures(M15 to M27),the mixtures(M21,M22,M24,M25 and M27)are safe in terms of flammability,GWP and possess reasonable COP which can be a potential alternative refrigerant mixture to R134a in small refrigeration systems.

关键词： hydrocarbons minimum inerting concentration ternary Global Warming Potential

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碳纳米管-二氧化钛纳米复合材料的合成及纳米流体驱油实验

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石油勘探与开发 2022年第6期49卷 1234-1241页

作者： DIBAJI A s RAsHIDI A BANIYAGHOOB s sHAHRABADI A 伊朗伊斯兰阿扎德大学德黑兰14515-775伊朗伊朗石油工业研究院纳米科技研究中心德黑兰14665-1998伊朗伊朗石油工业研究院石油工程所德黑兰***伊朗

为了同时利用(类)金属氧化物和碳纳米材料在提高采收率方面的作用,合成了碳纳米管-二氧化钛(CNT-TiO_(2))纳米复合材料,用接触角、界面张力和乳液稳定性等评价其性能,通过玻璃刻蚀模型驱油实验评估CNT-TiO_(2)纳米流体驱油效果。合成的C... 详细信息

为了同时利用(类)金属氧化物和碳纳米材料在提高采收率方面的作用,合成了碳纳米管-二氧化钛(CNT-TiO_(2))纳米复合材料,用接触角、界面张力和乳液稳定性等评价其性能,通过玻璃刻蚀模型驱油实验评估CNT-TiO_(2)纳米流体驱油效果。合成的CNT-TiO_(2)纳米复合材料由二氧化钛基体和碳纳米管增强相组成,二氧化钛为主要的结晶相,二氧化钛纳米颗粒覆盖在碳纳米管上。CNT-TiO_(2)能够将岩石的润湿性从油湿变为水湿,并降低油水界面张力。CNT-TiO_(2)可提高Pickering乳液的稳定性,在90℃条件下形成的乳液仍能保持稳定;NaCl质量分数高达2%时,配制的乳液在静置7 d后仍保持稳定。驱油实验结果显示,CNT-TiO_(2)纳米流体提高采收率效果较好。

关键词：碳纳米管二氧化钛纳米复合材料纳米流体 Pickering乳液提高采收率

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Hydroxyapatite-containing PEO-coating design for biodegradable Mg-0.8Ca alloy: Formation and corrosion behaviour

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Journal of Magnesium and Alloys 2023年第12期11卷 4468-4484页

作者： A.s.Gnedenkov s.L.sinebryukhov V.s.Filonina s.V.Gnedenkov Institute of Chemistry of FEB RAs 159 Pr.100-letiya VladivostokaVladivostok690022Russian Federation

In this study, the biocompatible protective coating was formed using plasma electrolytic oxidation(PEO) on bioresorbable Mg-0.8Ca alloy. The composition of the formed coating was studied using XRD, sEM-EDX analysis, and micro-Raman spectroscopy. The uniform distribution of hydroxyapatite over the thickness of protective PEO-layer was established. Using traditional(EIs, PDP, OCP) and local scanning electrochemical methods(sVET, sIET with H^(+)-selective microelectrode), the level of protective properties of PEO-layer in a biological environment(mammalian cell culture medium, MEM) was determined. It was established that modification of Mg-0.8Ca alloy surface by PEO contributes to a significant increase in the corrosion resistance of the surface layer, making it possible to control the process of material‘s biodegradation. The maximum local electrochemical activity was recorded after 72 h of testing, while for the uncoated sample,intense corrosion degradation was recorded in the first 12 min of exposure to the cell culture medium. Formation of the PEO-coating results in a twofold decrease in the corrosion current density(2.8·10^(-6)A cm^(-2)) and an increase in the impedance modulus measured at a low frequency(1.7·10^(4)Ω cm^(2)) in comparison with the uncoated material(9.5·10^(-6)A cm^(-2);8.1·10^(3)Ω cm^(2)). The mechanism of material bioresorption was established and a model for biodegradation process of Mg-0.8Ca alloy with hydroxyapatite-containing PEO-coating in MEM was proposed. Analysis of these results and comparing with others obtained by various scientific groups indicate the prospects for application of biocompatible PEO-coating on Mg-Ca alloy in implant surgery.

关键词： Magnesium-calcium alloy Biodegradation Implant surgery Plasma electrolytic oxidation Electrochemistry Minimum essential medium Hydroxyapatite

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Effect of Eu3+,Bi3+,and Li+ doping on luminescent property of GdNbO4

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Journal of Rare Earths 2024年第1期42卷 66-75页

作者： s.W.Wi Y.s.Lee Department of Physics and Integrative Institute of Basic sciences Soongsil University

We investigated the emission properties of Eu3+-doped GdNbO4-based oxide phosphors,aiming at improving the Eu3+emission by codoping of Bi3+and Li+.Eu3+singly doped,Eu3+and Bi3+doubly doped,and Eu3+,Bi3+,and Li+triply doped GdNbO4were prepared using a high-temperature solid-state reaction method.The red-orange emissions from Eu3+in the singly doped samples are significantly improved by the codoping of Bi3+,mainly due to the energy transfer from Bi3+to Eu3+.The additional codoping of Li+is found to increase the Eu3+emission significantly.This improvement might be attributed to the increase in the photoluminescent quantum yield originating from larger grain sizes and better crystallinity.A detailed analysis of the X-ray diffraction pattern and the asymmetric ratio estimated from the photoluminescence spectra show that the local lattice environment around Eu3+in GdNbO4does not change significantly with the codoping of Bi3+and Li+.Our results indicate that Li+doping is a promising way to improve the emission properties of rare-earth ion-doped GdNbO4phosphors.

关键词： Eu 3+ GdNbO 4 Codoping of Li + Photoluminescence sensitizer Rare earths

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M1主战坦克的仿真模型(续三)

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国外坦克 1995年第10期 29-31页

作者： Bolt beranek Newman Inc 杨晓虹

弹道学对sIMNET M1弹道模拟的要求被大大简化,只需模拟105mm主炮发射曳光脱壳穿甲弹和曳光破甲弹,而不用模拟12.7mm和7.62mm机枪。此外,因为sIMNET不是用于射击指导的教练设备,于是为简化弹道模拟而作了几个假设。第一,主炮总是瞄准的... 详细信息

弹道学对sIMNET M1弹道模拟的要求被大大简化,只需模拟105mm主炮发射曳光脱壳穿甲弹和曳光破甲弹,而不用模拟12.7mm和7.62mm机枪。此外,因为sIMNET不是用于射击指导的教练设备,于是为简化弹道模拟而作了几个假设。第一,主炮总是瞄准的;第二,只模拟ICAO标准气象条件下的理想弹道,且没有横风(人们希望将来在sIMNET R&D技术基础上的全体乘员训练模拟器建立完善的弹道模型,以满足训练要求)。

关键词：脱壳穿甲弹仿真模型训练模拟器气象条件主战坦克反装甲弹药 sIMNET 破甲弹理想弹道弹道模型

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Identification and Prediction of Diabetic Macular Edema on Two-dimensional Fundus Images with Raphe Assessment and Deep Convolution Neural Networks

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Biomedical and Environmental sciences 2022年第12期35卷 1156-1160页

作者： s.Karkuzhali Department of Computer science and Engineering Mepco Schlenk Engineering CollegeSivakasiTamilnadu 626005India

Diabetes is a common disease that has affected more than 285 million individuals[1]. Diabetic macular edema(DME) is an ophthalmic disease that causes vision loss. Patients with diabetic retinopathy(DR)may also be affe... 详细信息

关键词： Diabetic edema Diabetes

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