项目反应理论在中考命题质量评价中的应用     

赵娟  场建芹 《大连教育学院学报》2014,(1):17-19

应用项目反应理论对中考命题质量进行分析,可以排除抽样干扰,准确评估试题的难度,客观精细地描述试题的区分度,评估整套试卷和各试题对学生能力估计的精度,查找赋分标准和阅卷过程中存在的问题。  相似文献   

Thermal Response Test by Improved Test Rig with Heating or Cooling Soil简   总被引：1，自引：1，他引：0  

付文成  朱家玲  张伟 《天津大学学报(英文版)》2014,20(1):15-20

An improved test rig providing both the heat and cold source was used to perform thermal response test(TRT), and the line source model was used for data analysis. The principle of determining the temperature difference between the inlet and outlet of test well can keep the heating or cooling rate constant, along with a reduced size of test rig. Among the influencial factors of the line source model, the temperature difference was determined as the most important, which agreed with the test results. When the gravel was taken as the backfill material, the soil thermal conductivities of heating and cooling at the test place were 1.883 W/(m·K) and 1.754 W/(m·K), respectively, and the deviation of TRT between heating and cooling soil was 6.8%. In the case of fine sand, the thermal conductivities of heating and cooling were 1.541 W/(m·K) and 1.486 W/(m·K), respectively, and the corresponding deviation was 6%. It was also concluded that different velocities of water had less influence on TRT than the temperature difference.  相似文献   

Phase error correction for fringe projection profilometry by using constrained cubic spline     

Jun-Zheng Peng  ;Hang-Kong Ouyang  ;Quan Yu  ;Ying-Jie Yu  ;Ke-Sheng Wang 《上海大学学报(英文版)》2014,(1):39-47

In fringe projection profilometry, the nonlinear intensity response caused by the γ effect of a digital projector results in periodic phase error and therefore measurement error. Previous error correction methods are largely based on the calibration of single γ value. However, in practice, it is difficult to accurately model the full range of the intensity response with a one-parameter γ function. In this paper, a compensated intensity response curve is generated and fitted with the constrained cubic spline. With the compensated curve, the full range of the nonlinear intensity response can be corrected and the periodic phase errors can be removed significantly. Experimental results on a flat board confirm the average root mean square （RMS） of the phase error which can be reduced to at least 0.0049 rad.  相似文献   

无创正压通气在早产儿呼吸窘迫综合征治疗中的价值分析     

李梅君  张红 《大理师专学报》2014,(8):31-32

目的：分析鼻塞式持续正压通气（CPAP）在治疗早产儿呼吸窘迫综合征（NRDS）中的临床疗效,探讨持续呼吸道正压通气在早产儿呼吸窘迫综合征治疗中的价值。方法：在综合治疗基础上,对大理州妇幼保健院新生儿科2012年10月至2013年10月84例胎龄为32~36周的早产RDS患儿给予CPAP治疗,观察患儿在应用CPAP前及CPAP治疗6 h后的疗效。结果：实施CPAP通气6 h后,患儿青紫消失,吸气性呼吸困难减轻,呼吸频率降至（58.2±4.7）次/min,心率降至（142.8±9.4）次/min,吸入氧浓度为（42.0±7.3）%,而经皮血氧饱和度维持在（94.8±4.5）%,动脉血氧分压升至（8.7±0.7）kPa,动脉血二氧化碳分压降至（5.3±0.6）kPa,差异具有统计学意义。应用CPAP期间除2例病情加重改用有创机械通气外未发生其他明显并发症。结论：使用CPAP对早产儿RDS有较好疗效,且治疗时间越早,痊愈率、成功率越高,无明显副作用。值得基层医院推广使用。  相似文献   

Savannah River National Laboratory Emergency Response Capability for Atmospheric Contaminant Releases     

《Journal of Map & Geography Libraries》2013,9(1):175-186

ABSTRACT

Emergency response to an atmospheric release of chemical or radiological contamination is enhanced when plume predictions, field measurements, and real-time weather information are integrated into a geospatial framework. The Weather Information and Display (WIND) System at Savannah River National Laboratory (SRNL) utilizes such an integrated framework. The rapid availability of predictions from a suite of atmospheric transport models within this geospatial framework has proven to be of great value to decision makers during an emergency involving an atmospheric contaminant release.  相似文献   

企业存货风险识别及应对措施研究     

朱鹏涛 《科技与管理》2014,(4):93-96

存货是企业经营活动中的必需品,也是审计中的重要风险点。针对存货的特点,通过定量方法分析存货风险发生的可能性和潜在影响,从而确定存货在管理过程中的3个重大风险点,分别是存货内控风险、存货损耗性风险、存货流动性风险。在此研究基础上,对存货内控风险、存货损耗性风险、存货流动性风险给出了应对建议。  相似文献   

我国农业保险与农村金融业发展关系研究     

陈艺源  任燕燕 《科学与管理》2014,(2):17-22

本文使用农村金融相关率和农村信贷转换率作为农村金融发展规模和发展效率的衡量指标,农业保险发展水平用农业保费收入来进行衡量。选取我国1990-2012年的年度数据,考察农业保险与农村金融业发展之间的长期协同关系,进一步运用向量误差修正模型(VECM)和脉冲响应函数分析二者之间的影响关系。结果表明:农业保险与农村金融发展规模和发展效率都是一阶单整的,而且它们之间存在长期协整关系,并且只存在单向因果关系:农村金融发展规模和农村金融发展效率是农业保险的格兰杰原因,反之不成立。在此基础上提出关于农业保险和农村金融系统未来发展的对策建议。  相似文献   

多人实时应答系统的研制     

丛聪  任轶君 《科教文汇》2014,(4):108-109

课堂形成性评测作为一种新的教学理念,已经得到很多人认可。而多人实时应答系统是在此基础上设计的,它能够提供一个交互式课堂教学互动平台,引导学生积极参与课堂教学活动,有效提高课堂教学效果。本文简要介绍了形成性评测以及该系统的实现。  相似文献   

全球化品牌的感知维度与情感反应——针对中国青年消费者的研究     

谢加封  谢海涛  汪浩 《软科学》2014,(11):111-114,137

通过消费者全球化品牌的联想测试和语义族分析,设计全球化品牌感知量表;根据调查问卷探索与验证全球化品牌的构念维度,研究感知维度对品牌选择行为的情感反应。结果发现:全球化品牌感知包括全球化光环因子、原产地因子、质量因子与社会责任因子;青年消费者对全球化品牌的社会责任感知不显著,全球化光环因子作为感性因子对消费者行为影响最大,其后是质量因子与原产地因子;原产地因子对全球化品牌的全球化光环因子与质量因子均有直接正向影响。  相似文献   

Dynamic response of functional virtual prototyping of motorcycle under combined excitations   总被引：1，自引：0，他引：1  

孙立星  舒歌群  卫海桥 《天津大学学报(英文版)》2013,19(4):279-286

This paper developed 3D product models of motorcycle and engine by UGNX as well as virtual prototyping by ADAMS program with road roughness generated by MATLAB. Under the straight-line running condition, the dynamic responses of motorcycle multibody system to both road and engine excitations were compared with those to only road excitation in terms of vertical acceleration response, amplitude frequency response and power spectral density. The comparisons of simulation data showed that the response due to flat road excitation was around 20 Hz, while that to the combined excitations was in a wide frequency band, of which the major components focused on 10 Hz, 15 Hz, 35 Hz ,70 Hz, 100 Hz and even higher frequencies, reflecting the characteristics of engine excitation based on its unbalanced inertia force and torque. It is concluded that the high fidelity virtual prototyping can simulate the dynamics of motorcycle product well in investigating the vibration and ride comfort performance.  相似文献