共查询到20条相似文献，搜索用时 31 毫秒
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金华市位于浙江省中西部,虽为内陆地区,但从整个大环境看仍处中国东南沿海,在福建及浙江沿海登陆的台风均易对金华地区产生影响。结合历年台风统计资料,台风对金华地区有风力大、短时强降雨的影响。强化结构抗风设计,尤其要重视附属结构、临时结构的抗风设计,可以减少风力破坏;进行工程防护可以减少短时强降雨带来的负面影响,防止山洪、滑坡、泥石流、城市内涝等灾害的发生。 相似文献
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The objective of the study is to investigate the effect of performance‐based financial incentives on work performance. The study hypothesized that the design features of performance‐based financial incentive schemes themselves may influence individuals' work performance. For the study, survey methodology was used and 93 technical‐level employees who were subjected to a performance‐based incentive scheme for at least 2 years in their firms responded. Regression analysis was used for data analysis. It was found that the design features of performance‐based financial incentives schemes explain 51% of the variance in work performance. Six of the incentive scheme factors, including the goals of incentive scheme, employee participation in setting goals, incentive scheme type, and payout frequency, have significant positive impact on work performance. Overall, the findings suggest that well‐designed and carefully implemented incentive schemes have significant positive impact on work performance. 相似文献
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Huda Karajeh Mahmoud Maqableh Lama Rajab Hiba Mohammad Tahani Khatib Nabeel Al-Qirim Ali Tarhini 《Education and Information Technologies》2018,23(5):2073-2090
This study examined impact of a social media networks course on student use of SNSs performance. Moreover, it examined the associations among course design, course materials, learning experiences and a social media networks course. Survey instrument is used to examine the relationships in the proposed model. A total of 380 questionnaires have been collected from students at the University of Jordan who studied the social media networks course. A structural equation modelling approach based on AMOS 20.0 statistical software is used to study the causal relationships and test the hypotheses between the observed and latent constructs in the proposed research model. The analysis results revealed that course materials and learning experiences directly, positively and significantly impacted the social media networks course, which in turn had a significant impact on students’ use social networks sites performance. Course design, however, did not impact the social media networks course. Our findings have important implications as we demonstrated the validity of the joint two different models and provide information about impact of studying social media networks course on students’ academic performance. 相似文献
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林抒毅田源黄晓生孔毅鹏俞智坤 《福建工程学院学报》2020,(3):260-266
针对四线圈非理想耦合对系统输出电流特性的影响,采用等效容性耦合的方法来实现理想的四线圈系统电流输出特性。 首先结合补偿电感的磁集成,减少了无线电能传输系统磁元件数量并缩小其体积,再对等效电路参数的设计进行分析并设计了实验样机。 实验结果验证了容性耦合等效方法的准确性与有效性。 在负载范围内,样机接收端直流输出电流的波动小于8%,传输距离为75 mm时整机输出功率为300 W,效率峰值达到了81.49%。 相似文献
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Richard J. Jardine 《浙江大学学报(A卷英文版)》2011,12(1):1-14
An integrated approach to geomaterial characterization is advocated that combines geology, in-situ testing, fabric studies, routine index experiments and advanced laboratory testing. It is shown that advanced laboratory testing can explore features such as kinematic yielding and anisotropy in stiffness or shear strength that would otherwise be impossible to quantify. A detailed study performed in London clay at the new Heathrow Terminal 5 site is used to illustrate the arguments made. It is shown that the London clay has strong anisotropy in stiffness, is highly non-linear over the strain range of engineering interest, has markedly anisotropic shear strength characteristics and exhibits a pronounced degree of brittleness. These features can impact significantly on the practical design and analysis of civil engineering works including shallow and deep foundations, tunnels and excavations, and the stability of slopes. 相似文献
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裴志军 《天津工程师范学院学报》2005,15(2):13-15
分析了∑△调制器的工作原理及电路非理想特性对调制器性能的影响，应用Matlab对电路的非理想特性进行行为级描述，构建实际电路行为模型，以对∑△调制器设计性能进行有效评估。 相似文献
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以河南某高校单层大空间会议室结构抗震性能分析为例,按照《建筑抗震设计规范》(GB50011—2010)给定的算法,计算分析了该结构的抗震性能.采用有限元分析的方法研究其应力大小及梁柱的连接方式对应力的影响,并对以上两种算法的计算结果进行对比,所得的结论可以供该类型结构的设计及旧房加固改造参考. 相似文献
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宋秀英 《黄冈职业技术学院学报》2011,13(5):90-95
根据景观小品设计的市场需要,有必要对景观小品设计表现进行研究,通过分析景观小品设计的必要性、要求、设计内容及各种表现形式,以提高人们对景观小品设计及表现的认识和理解,扩大该行业的社会影响。 相似文献
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In the hostile and highly corrosive marine environment,advanced composite materials can be used in marine current turbines due to their high strength-to-weight ratios and excellent resistance to corrosion.A composite material marine current turbine(CMMCT),which has significant advantages over traditional designs,has been developed and investigated numerically.A substantial improvement in turbine performance is achieved by placement of a duct to concentrate the energy.Computational fluid dynamics(CFD) results show that the extracted power of a ducted CMMCT can be three to four times the power extracted by a bare turbine of the same turbine area.The results provide an insight into the hydrodynamic design and operation of a CMMCT used to shorten the design period and improve technical performance. 相似文献
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This study investigated the performance of four widely used data-collection designs in detecting test-mode effects (i.e., computer-based versus paper-based testing). The experimental conditions included four data-collection designs, two test-administration modes, and the availability of an anchor assessment. The test-level and item-level results were analyzed with inferential statistics and multidimensional scaling, respectively. The test-level results supported the superiority of the single-group counterbalanced design and the random-groups design over the single-group design without counterbalancing and the anchor test design in the recovery of the actual test-mode effects. Analysis at the item level revealed the presence of a two-dimensional solution, with the data-collection design contributing significant variability over and beyond the test mode. 相似文献
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曾小平 《绵阳师范学院学报》2011,30(11)
针对室内环境设施需求,设计了一种节能自动湿度控制综合电路,包括湿度、水位、人体红外检测控制电路与水蒸发器控制。该综合电路的运用效果在于：在检测到室内有人和水蒸发器有水时能将室内湿度自动控制在45%RH～60%RH合适湿度范围内。该方案设计,性能可靠、成本低、构建灵活,实现了室内全天后的节能降耗的自动湿度测控。 相似文献
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This article presents a longitudinal study, over eleven years, of the academic progress of a cohort of design students (n = 475) at a major Australian university. The students were from four different spatial design disciplines: architecture, industrial design, interior design, and landscape architecture. The article identifies cognitive variables that may predict future academic success. This research uses regression analysis to identify correlations across a range of variables, in particular exploring the relationship between university entrance scores, subjects studied at school (art and graphics) and academic success as defined by university grade point average and time to completion. This study shows that prior knowledge in art and graphics is not a useful predictor of future academic success, while university entrance scores and first year performance are related to ongoing academic success. These results suggest that for the design disciplines explored here, discipline‐specific prior knowledge is not an important requirement for university entrance. 相似文献
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We investigate the best performance for linear feedback control systems in the case that plant uncertainty is to be considered. First, we define an average integral square criterion of tracking error over a class of stochastic model errors. By utilizing spectral factorization to minimize the performance index, we derive an optimal controller design method and further study best performance in the presence of stochastic perturbation. The results can be used to evaluate optimal performance in practical control system designs. 相似文献
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To enhance college completion, many institutions have introduced college remedial programs. Yet, till now there is little evidence that this policy helps raise students’ persistence and performance in college. To better understand how to design cost-effective remedial education, this paper studies the impact of an intervention implemented in an undergraduate economics program in Italy. This remedial policy aims at raising students’ effort and performance by combining a short remedial course with the threat of re-enrolling them in the first year in case of a failure in the remedial exam. To estimate causal effects, I implement a sharp regression discontinuity design that exploits the cutoff rule used to assign students to remediation. Results indicate that this nudge-type policy fails to obtain any positive and significant effect on either persistence or performance in college. 相似文献
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Within the research community, there is a vigorous debate over whether additional educational expenditures will lead to improved performance of schools. Some of the debate is an outgrowth of the lack of causal knowledge of the impacts of expenditures on student outcomes. To help fill this void, we examine the causal impact of capital expenditures on school district proficiency rates in Michigan. For the analysis, we employ a regression discontinuity design where we use the outcomes of bond elections as the forcing variable. Our results provide some evidence that capital expenditures can have positive effects on student proficiency levels. 相似文献
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Understanding how situational features of assessment tasks impact reasoning is important for many educational pursuits, notably the selection of curricular examples to illustrate phenomena, the design of formative and summative assessment items, and determination of whether instruction has fostered the development of abstract schemas divorced from particular instances. The goal of our study was to employ an experimental research design to quantify the degree to which situational features impact inferences about participants’ understanding of Mendelian genetics. Two participant samples from different educational levels and cultural backgrounds (high school, n = 480; university, n = 444; Germany and USA) were used to test for context effects. A multi-matrix test design was employed, and item packets differing in situational features (e.g., plant, animal, human, fictitious) were randomly distributed to participants in the two samples. Rasch analyses of participant scores from both samples produced good item fit, person reliability, and item reliability and indicated that the university sample displayed stronger performance on the items compared to the high school sample. We found, surprisingly, that in both samples, no significant differences in performance occurred among the animal, plant, and human item contexts, or between the fictitious and “real” item contexts. In the university sample, we were also able to test for differences in performance between genders, among ethnic groups, and by prior biology coursework. None of these factors had a meaningful impact upon performance or context effects. Thus some, but not all, types of genetics problem solving or item formats are impacted by situational features. 相似文献