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Caffeine Increases Verticaljumping Height in Young Trained Males Before But Not After a Maximal Effort Strength Training Session

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journal of Science in Sport and Exercise 2020年第2期2卷 145-153页

作者： Daniel S.Tangen Stian R.Nielsen Kristoffer j.Kolnes jφrgen jensen Department of Physical Performance Norwegian School of Sport SciencesSognsveien 220UllevaI StadionPO Box 40140806 OsloNorway Steno Diabetes Center Odense Odense University Hospital5000 Odense CDenmark

The aim of the present study was to investigate the effect of caffeine on vertical jumping height in rested condition and after a heavy strength training *** well-trained young males with experience in jump and strength training were included in this double-blinded,randomised study with cross-over ***(3 mg/kg body weight)or placebo were ingested 45 min prior to the jump *** was performed on a force platform and vertical jumping height was *** a standardized warm up,participants performed jumping series consisting of three maximal jumps with 30 s rest between jumps followed by five maximal jumps with 7 s rest between *** participants performed a heavy strength training of the leg muscles(leg press:3×15 reps)and the jumping series was repeated immediately after(30 s),and after 5 min and 15 min *** increased the maximal vertical counter movement jump height(P≤0.05)and mean value of the 5-jump sequence prior to the strength *** increased jump height by 2.2 cm±0.5 cm at the first *** lactate after the strength training increased to 6.97±1.20 and 7.77±0.54 mmol/l in PlA and CAF,respectively(P=0.19).The jump height was reduced by 8 cm after the strength *** were no differences in jump height after ingestion of caffeine or placebo immediately after the strength training session or in the recovery period,but blood lactate in the recovery period was higher in CAF compared to PlA(ANOVA;Plusion:Caffeine increased the vertical jump height in the resting ***,after a maximal effort strength training session the positive effect of caffeine was no longer significant.

关键词： lactate Fatigue Recovery Force-velocity Athletes

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关于硫酸厂设计的种种选择

硫酸工业 1978年第S3期 1-9页

作者： j.B.Rinckhoff ,l.j.Friedman ,何进宝

硫酸虽然是现有最老的和高度标准化的化学加工过程之一,但它仍有一系列能够影响该装置的可靠性、成本、排出物等水平的种种选择。自上一世纪末接触法成功地发展以来,制造硫酸的方法虽然没有发生多大的变化,但在机械设计方面却有许多的... 详细信息

硫酸虽然是现有最老的和高度标准化的化学加工过程之一,但它仍有一系列能够影响该装置的可靠性、成本、排出物等水平的种种选择。自上一世纪末接触法成功地发展以来,制造硫酸的方法虽然没有发生多大的变化,但在机械设计方面却有许多的变化与改进。

关键词：硫酸厂硫黄干燥塔吸收塔压力降废气处理设备制酸厂主鼓风机焚硫炉酸冷却器汽轮机蒸汽透平

Residual stress in the cylindrical drawing cup of SUS304 stainless steel evaluated by split-ring test

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Residual stress in the cylindrical drawing cup of SUS304 sta...

第十三届全国物理力学学术会议

作者： l.H.Xiao j.Z.Xiang D.H.Yuan j.G.liu Y.C.Zhou School of Mechanical Engineering Xiangtan University Key laboratory of low Dimensional Materials & Application Technology ( Xiangtan University) Ministry of Education

The residual stresses in the wall of SUS304 stainless steel cylindrical drawing cup were evaluated by split-ring tests,and the influences of the stamping die parameters on the residual stress were investigated.A new theoretical model of split-ring test was developed to evaluate the residual stress in ring,which was verified to be reasonable and reliable by numerical simulations with ABAQUS *** groups split-ring tests were completed,and the residual stresses were calculated according to the theoretical *** split-ring test results showed that the circumferential residual stress in the wall of SUS304 stainless steel cylindrical drawing cup was very large,and did not change with the different die corner *** circumferential residual stress first increased with the increase of drawing punch-die clearance,then almost remained unchanged when the clearance increased greater than blank thickness *** a smaller clearance was suggested to be chosen to reduce the residual stress in the wall of SUS304 stainless steel drawing cup.

关键词： residual stress split-ring test FEM numerical simulation SUS304 stainless steel cylindrical drawing cup

MIXED SOlVENTS AS ENVIRONMENTAllY BENIGN REPlACEMENT FOR BENZENE IN CAPROlACTAM EXTRACTION

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MIXED SOLVENTS AS ENVIRONMENTALLY BENIGN REPLACEMENT FOR BEN...

International Solvent Extraction Conference 2005

作者： M.l.van Delden N.j.M.Kuipers A.B.de Haan University of Twente Enschede The Netherlands University of Twente Enschede The Netherlands University of Twente Enschede The Netherlands

一种GaAs/GaAlAs分别限制单量子阱锁相列阵激光器

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journal of Semiconductors 1989年第10期10卷 799-804页

作者：朱龙德 G.A.B.Feak j.M.Ballantyne D.K.Wagner P.l.Tihanyi 中国科学院半导体研究所美国康乃尔大学电机系美国麦道公司光电子中心

本文描述一种由MOCVD生长的GaAs/GaAlAs 分别限制单量子阱片子制作的锁相列阵大功率激光器.由十个单横模器件耦合而成的列阵器件,其阈值电流为67mA,线性输出功率大于500mW,微分量子效率达60％.列阵器件由强耦合区和弱耦合区构成,考察了... 详细信息

本文描述一种由MOCVD生长的GaAs/GaAlAs 分别限制单量子阱片子制作的锁相列阵大功率激光器.由十个单横模器件耦合而成的列阵器件,其阈值电流为67mA,线性输出功率大于500mW,微分量子效率达60％.列阵器件由强耦合区和弱耦合区构成,考察了强耦合区的几何结构对耦合模即输出远场分布的影响.

关键词： MOCVD GaAlAs 锁相列阵激光器

Research status of plasma facing materials for the fusion reactors

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Research status of plasma facing materials for the fusion re...

第十三届全国核物理大会暨第八届会员代表大会

作者： j.l.Chen j.G.li Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,P.R.China

Plasma-facing components (PFCs) of fusion reactors will be operated in an environment which comprises incident particles and heat flux from the *** surface of the plasma-facing material (PFM) is subjected to erosion b... 详细信息

关键词： Plasma facing materials fusion reactors heat flux erosion impurity

用CFRP加固预裂钢筋混凝土梁的疲劳特征的研究(英文)

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南昌工程学院学报 2007年第3期26卷 7-14页

作者：吴泽仪 j.-l. Clément C. Boulay j.-l. Tailhan jean Muller国际咨询公司中央路桥实验室

通过对碳纤维织物加固的预裂钢筋混凝土(RC)梁的三点弯曲试验,给出了其疲劳特征实验研究结果.RC梁(200 mm×150 mm×700 mm)被施加预载直到所产生的两裂缝的宽度之和为0.7 mm,然后用碳纤维织物进行抗弯和抗剪加固.碳纤维织物在裂缝处的... 详细信息

通过对碳纤维织物加固的预裂钢筋混凝土(RC)梁的三点弯曲试验,给出了其疲劳特征实验研究结果.RC梁(200 mm×150 mm×700 mm)被施加预载直到所产生的两裂缝的宽度之和为0.7 mm,然后用碳纤维织物进行抗弯和抗剪加固.碳纤维织物在裂缝处的联结作用,可使RC梁在静载和疲劳载荷作用下其裂缝宽度减小,且在碳纤维和钢筋间产生应力重分布.实验结果表明,通过碳纤维织物加固的预裂钢筋混凝土梁,其刚度、极限结构强度及极限疲劳强度都得到明显改善.

关键词：疲劳钢筋混凝土梁碳纤维织物加固

Is allelopathy a driving force in forest succession?

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Is allelopathy a driving force in forest succession?

中国第二届植物化感作用学术研讨会暨中国植物保护学会植物化感作用专业委员会成立大会

作者： S.l.PENG Z.Q.CHEN j.WEN H.SHAO South China Botanical Garden Chinese Academy of Sciences

Allelopathy is a major research subject in chemecology, it studies the relationships between the biology and abiotic environment. Since 1960s, several scientists have studied the allelopathy in relation to plant ecology. Now most researches are being done on herbaceous plants and few on woody plants, because of their long lifecycle and slow response to allelopathic substances. Hence, we studied the dynamics and role of allelopathy in forest ecosystem. The traditional ecological theory states that the main driving forces in forest succession are light and water. However, our results of more than 20 years of fieldwork on six major tree species (Cryptocarya chinensis, Cryptocarya concinna, Schima superba, Castanopsis chinesis, Caryota ochlandra and Castanopsis fissa) of Dinghu mountain showed that a) all these test species contain allelochemicals, b) allelopathy affects the succession among these species and c) allelopathy play important role in forest succession. Thus we put forward a hypothesis that allelopathy, light and water, may be considered as the major driving forces in tropical and sub-tropical forest succession.

关键词： Allelopathy cabbage Castanopsis chinesis Castanopsis fissa Caryota ochlandra Cryptocarya chinensis Cryptocarya concinna cucumber forest Pinus massoniana radish Schima superba succession.

ABA accumulation above endogenous levels is necessary for desiccation tolerance in Physcomitrella patens

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ABA accumulation above endogenous levels is necessary for de...

2016年全国植物生物学大会

作者： lihong Xiao Abou Yobi Karen l.Koster Yikun He Melvin j.Oliver School of life Sciences Capital Normal University Shanghai Center for Plant Stress Biology Chinese Academy of Sciences Plant Genetics Research Unit Midwest AreaAgricultural Research ServiceUnited States Department of AgricultureUniversity of Missouri Department of Biology University of South Dakota

The moss Physcomitrella patens,a model system for basal land plants,highly tolerates several abiotic stresses,including dehydration. We previously reported that Physcomitrella survives dehydration to-13 MPa under controlled drying regimes that bring the water potential of the moss to equilibrium with the air in 6 days. Tolerance of more rapid desiccation to water potentials below-100 MPa was only achieved by pre-treatment with exogenous ABA. We now report that gametophores can survive desiccation below-100 MPa under a gradual drying regime that more closely mimics the dehydration dynamics it would experience in its natural habitat. To explain the difference in response to drying rate,we hypothesized that gradual drying allows P. patens plants to progressively synthesize to reach levels that are required for the induction of desiccation tolerance. To address this hypothesis,we measured the endogenous ABA levels of protonemata and gametophores under different drying regimes. We also assessed the minimum concentration of exogenous ABA and the length of exposure to ABA required for induction of desiccation tolerance in the moss. Results from this work will provide insight into ongoing studies to uncover the underlying mechanisms of desiccation tolerance in this bryophyte.

关键词： Physcomitrella patens desiccation tolerance gradual dehydration equilibrium dehydration abscisic acid