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排序方式: 共有521条查询结果,搜索用时 230 毫秒
71.
Wan Decheng 《上海大学学报(英文版)》1999,(1)
1 Introduction Theproblemoftheinteractionbetweenregularwaterwavesandasubmergedobstacleisrelevanttothedesignandoperationofoffshoreandcoastalstructures.Aknowledgeofthefreesurfacedeformationsandvortexflowisnecessaryforestimationofdriftforcesandsuperhar… 相似文献
72.
知识空间:知识组织的概念基础 总被引:11,自引:0,他引:11
文章从情报组织和知识组织的具体化出发 ,提出了“知识空间”这样一个知识组织的新的概念基础。探讨了可在多维空间中表示的知识领域的“概念向量”、基于对这些概念理解的个人“状态向量”、包括知识子空间的检索系统中可能存在情报项的“表示向量”、用户扩检或缩检子空间的“检索体积”,以及这一新概念意义。参考文献 1 1 相似文献
73.
对于原函数存在定理的推广,给出了另一种证明;对定积分的中值定理给出了正确的证明,而其它书中的证明是欠妥的;用定积分的定义等证明了微积分的基本公式;给出了几个旋转体的体积公式;几何级数前n项和公式的应用. 相似文献
74.
今本<吴越春秋>是残本而非全本.亡逸的两卷其一应该在今本<廅闾内传>之后,<夫差内传>之前,主要内容应是记叙阖闾"南伐于越"的檇李之战和夫差即位三年的励精图治.另一卷应该是在今本<越王无余外传>之后,<勾践入臣外传>之前,主要内容应是记叙勾践轻信所谓"大朋之龟"的吉兆,不听范蠡劝谏,轻率伐吴,导致兵败夫椒,不得不退守会稽,与吴行成.这部分内容中应该是融合了范蠡、文种二人的生平及其入越经过的. 相似文献
75.
曹祥军 《廊坊师范学院学报(自然科学版)》2009,9(3):86-88
如何应用软件解决手工计算中的难点和疑点,保质保量地在有限的时间内完成工程造价的计量和控制成了造价人员最关心的问题。文章结合广联达算量软件的使用,提出了解决新的工程量清单模式下工程造价的计算方法和技巧。 相似文献
76.
杨广岭 《石家庄铁路工程职业技术学院学报》2010,(1):40-44
通过西安北站大直径灌注桩后注浆试桩试验结果,分析对比后注浆灌注桩单桩竖向承载力的提高幅度以及承载力估算值与实测值的差别,根据灌注桩后注浆现场施工出现的问题及处理过程,提出后注浆试桩时,优化后注浆参数是试桩的重要内容,并总结优化后注浆参数中注浆阎设置及注浆量选取的具体步骤和方法。 相似文献
77.
球面几何已列为高中数学课程选修内容,球面几何的知识在实际中有重要的应用,如航海、航空领域等。利用积分的方法研究了与一般球面三角形关联的空间体体积。 相似文献
78.
Alejandro Pérez-Castilla Paulino Padial Antonio J. Morales-Artacho Belén Feriche 《Journal of sports sciences》2018,36(12):1331-1339
This study compared the effects of two velocity loss thresholds during a power-oriented resistance training program on the mechanical capacities of lower-body muscles. Twenty men were counterbalanced in two groups (VL10 and VL20) based on their maximum power capacity. Both groups used the same exercises, relative intensity and repetition volume, only differing in the velocity loss threshold of each set (VL10: 10% vs. VL20: 20%). Pre- and post-training assessments included an incremental loading test and a 15-m linear sprint to assess the force- and load-velocity relationships and athletic performance variables, respectively. No significant between-group differences (P > 0.05) were observed for the force-velocity relationship parameters (ES range = 0.15–0.42), the MPV attained against different external loads (ES range = 0.02–0.18) or the 15-m sprint time (ES = 0.09). A high between-participants variability was reported for the number of repetitions completed in each training set (CV = 30.3% for VL10 and 29.4% for VL20). These results suggest that both velocity loss thresholds induce similar changes on the lower-body function. The high and variable number of repetitions completed may compromise the velocity-based approach for prescribing and monitoring the repetition volume during a power-oriented resistance training program conducted with the countermovement jump exercise. 相似文献
79.
Daniel J Hiscock Brian Dawson Michael Clarke Peter Peeling 《Journal of sports sciences》2018,36(2):191-197
This study examined the influence of differing volume load and intensity (%1 repetition maximum[%1RM]) resistance exercise workouts on session rating of perceived exertion (sRPE) countermovement jump (CMJ) performance and endocrine responses. Twelve participants performed a workout comprising four exercises (bench press, back squat, deadlift and prone bench pull) in randomised order as either power (POW); 3 sets × 6 repetitions at 45%1RM × 3 min inter-set rest, strength (ST); 3 sets × 3 repetitions at 90%1RM × 3 min inter-set rest, or hypertrophy (HYP); 3 sets × 10 repetitions at 70%1RM × 1 min inter-set rest in a randomised-crossover design. CMJ performance and endocrine responses were measured immediately pre-, post-, 12, 24, 48 and 72 h post-exercise. POW sRPE (3.0 ± 1.0) was lower than ST (4.5 ± 1.0) (P = 0.01), and both were lower than HYP (8.5 ± 1.0) (P = 0.01). Duration of CMJ decrement was longer (P ≤ 0.05) for HYP (72 h) compared to POW (12 h) and ST (24 h). Testosterone concentration was greater (P ≤ 0.05) immediately post-exercise in HYP compared to POW and ST. In conclusion, less inter-set rest, greater volume load and intensity (%1RM) may increase sRPE, duration of CMJ performance decrement and testosterone responses in resistance exercise. 相似文献
80.
《European Journal of Sport Science》2013,13(5):527-533
Abstract This study examined the agreement between estimates of thigh volume (TV) with anthropometry and dual-energy x-ray absorptiometry (DXA) in healthy school children. Participants (n=168, 83 boys and 85 girls) were school children 10.0–13.9 years of age. In addition to body mass, height and sitting height, anthropometric dimensions included those needed to estimate TV using the equation of Jones & Pearson. Total TV was also estimated with DXA. Agreement between protocols was examined using linear least products regression (Deming regressions). Stepwise regression of log-transformed variables identified variables that best predicted TV estimated by DXA. The regression models were then internally validated using the predicted residual sum of squares method. Correlation between estimates of TV was 0.846 (95%CI: 0.796–0.884, Sy·x=0.152L). It was possible to obtain an anthropometry-based model to improve the prediction of TVs in youth. The total volume by DXA was best predicted by adding body mass and sum of skinfolds to volume estimated with the equation of Jones & Pearson (R=0.972; 95%CI: 0.962–0.979; R 2=0.945). 相似文献