Chinese Science Bulletin, 2009

2019

北京工业大学学报, 2017

为有效地获取滚珠丝杠副精度寿命特征,利用滚珠丝杠副磨损特征建立加速退化模型,并且根据设计的试验装置和试验过程的摩擦力矩值变化情况,采用参数估计方法进行退化数据的统计分析,获得不同应力水平下的滚珠丝杠副加速退化参数模型.同时,根据不同应力条件下实测的滚珠丝杠副摩擦力矩退化数据,计算出滚珠丝杠副定位反向变动量,为滚珠丝杠副的定位精度退化提供一种新的评价方法.建立的滚珠丝杠副加速退化模型针对其磨损进程极为缓慢的特性,利用该退化方法能较准确地推算出滚珠丝杠副精度寿命,能节约滚珠丝杠副试验费用、试验时间和指导滚珠丝杠副的设计.

Chinese Science Bulletin, 2009

Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.], 2008

Based on the TRACE-P emission data and a Shanghai local emission inventory, the regional air quality model Models-3/CMAQ was applied with the mesoscale model MM5 to simulate the distribution and transport status of O3 and PM10 in the Yangtze River Delta (YRD) in January and July 2001. Ten days' hourly monitoring data at Shanghai monitoring sites were used to verify the model performance. Results show that the correlation coefficients between monitoring and simulation data of O3 and PM10 are 0.77 and 0.52, and the indices of agreement reach 0.81 and 0.99, respectively. The Models-3 simulation shows a 27% underestimation of the maximum O3 hourly concentration, but performs well in average O3 hourly concentration simulation with a normalized bias of -3.1%. The model shows a 10% underestimation of the average PM10 hourly concentration, with a normalized bias of 46%. Models-3/CMAQ has the ability to simulate the processes of air pollution transport in the YRD, and the model results a...

Anhui shixue [Anhui historical studies], 2020

This paper suggests that attention to Chinese philanthropy is not, however, as limited as often suggested because this topic has often been “embedded,” or hidden, in other subject areas that resulted in their exclusion from bibliographies under the keywords philanthropy or charity. The main example of this “embedding” can be seen in studies of missionary history, which often included significant exposition of the philanthropic work of missionaries in China despite not being categorized under the “philanthropy” subject heading. A complete understanding of Western studies of Chinese philanthropy cannot ignore the contributions of these studies. This paper also argues that the dominance of missionaries in Western perceptions of philanthropy in China for a long time hindered, or even distorted, the growth of the history of Chinese philanthropy as a specialized area of research. It was only with the development of other trends in Western studies of Chinese history, beginning with an emphasis on “China-centered history,” that eventually helped to correct the distortions in Western perceptions about Chinese philanthropy. These development ultimately contributed growing attention to this subject that finally promises to bring more strength and better balance to the study of Chinese philanthropy in the West.

Acta Ecologica Sinica, 2014

Numerous studies have shown that ecological factor changes along the spatial gradient of urban and rural sites have a strong similarity to the temporal gradient of global change. Therefore, based on environmental gradients between urban and rural areas, a space鄄for鄄time substitution experiment called the " urban nature experimental field冶 method is developed to research the response of the terrestrial ecosystem to global climatic change. In recent related studies, the characteristics of ecological factors in urban and rural areas were observed in many cities around the world, most of which were focused on temperature and carbon dioxide. However, some reports showed that the disturbance from near鄄ground ozone was one of the most influential factors in determining the effectiveness and applicability of the method. To date, little research has been carried out to monitor and identify the spatial variation of near鄄ground ozone concentrations along the urban鄄rural gradient. Therefore, we selected the following urban and rural forest sites: the urban site in Qingliangshan Park near the urban center of Nanjing, and the rural site in Xiashu at 41. 7 km distance from the Nanjing city center. We monitored near鄄ground ozone concentrations, as well as light intensity, air temperature and humidity, from June 2011 to January 2013. We also compared diurnal and seasonal variation of ozone concentration. The results suggest that there were significant differences of temperature, humidity and maximum light intensity between the two observation sites (P<0郾 001). Compared to the rural forest site, the urban site had an average 0.93益 higher temperature, 3.37% lower humidity, and 13108.77 lx lower maximum light intensity. This shows typical differences of temperature and humidity between urban and http: / / www.ecologica.cn rural sites, and implies the representativeness and appropriateness of the selection of the two monitoring sites. At the urban site, an annual average of 19.95 nL / L in near鄄gound ozone concentration was observed, slightly less than that at the rural site (23.24 nL / L). The difference pattern of ozone concentration between the two sites varied seasonally. In autumn, winter and spring, significantly higher seasonal average ozone concentrations were observed at the rural forest site, relative to the urban site (P< 0.01). In summer, there was no difference between the two sites (P > 0.05). Relative frequencies of ozone concentrations in excess of 40 nL / L were 14. 0% and 13. 9% at the urban and rural sites, respectively. AOT40 (accumulated ozone exposure over a threshold of 40 nL / L) values at the urban and rural forest sites were 0.968伊10 h and 1郾 259 伊 10 h, respectively. There was no significant difference in AOT40 values between the two sites. Our study demonstrated that near鄄ground ozone concentration in the rural forest was generally higher than that in the urban forest. However, there was no significant difference during summer in the city of Nanjing, the season when plants grow vigorously and are susceptible to damage from near鄄ground ozone concentrations. We conclude that the disturbance of plant growth from variation of near鄄ground ozone concentrations between the urban and rural sites was negligible in the urban space鄄for鄄time substitution experiments.

Advances in Psychology, 2015

Background: The purpose of this study was to determine a factor structure for the immersed tendency questionnaire (ITQ) under the background of Chinese culture. The 14 items comprising the ITQ originally derived from Witmer and Michael's immersed tendency questionnaire (1998). Methods: Data from 360 university students were subjected to exploratory factor analysis (EFA) and 440 university students were subjected to confirmatory factor analysis (CFA). Results: CFA confirmed that ITQ was a 4-factor structure. EFA explained 50.65% of the variance through a 19-item, 4-factor structure (game immersed, state involvement, focus, and emotional involvement). Adding the total score, Cronbach's alpha coefficients were 0.512 -0.789. ITQ had satisfying structure validity (χ 2 /df = 2.736, NNFI = 0.91, IFI = 0.93, CFI = 0.93, RMSEA = 0.064) and criterion validity (r = 0.575, p < 0.001). Conclusions: The revised ITQ had a satisfying structure validity and reliability; the 4-factor had a significantly better fit, and could be used in the related fields of research.

Zhongguo kexue, 2017

Humanities and Arts

The Canglangting Garden was first built by Su Shunqin in the Northern Song Dynasty and underwent frequent changes in the following four dynasties: Song, Yuan, Ming, and Qing. The theme of "Canglang" and its connection with Su Shunqin also disappeared and emerged in history, and gradually became prominent after the renovation of Canglangting Garden by Song Luo during the Kangxi period of the Qing Dynasty. Based on local Chronicles, garden records, poems and images, and other related historical documents, this paper focuses on the study of the spatial narrative changes of Canglangting Garden from the initial construction of Su Shunqin to the renovation of Song Luo by intensive literature reading, image analysis and field survey, discusses some important issues and details in particular, such as the background of the emergence of Canglang theme, the competition between Zhang and Han during the chaotic times, the disappearance