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| 1 | Soil Carbon, Nitrogen and Microbial Dynamics of Pasturelands: Impacts of Grazing Intensity and Planting Systems显示文摘Management intensity critically influences the productivity and sustainability of pasture systems through modifying soil microbes, and soil carbon(C) and nutrient dynamics; however, such effects are not well understood yet in the southeastern USA. We examined the effects of grazing intensity and grass planting system on soil C and nitrogen(N) dynamics, and microbial biomass and respiration in a long-term field experiment in Goldsboro, North Carolina, USA. A split-plot experiment was initiated in 2003 on a highly sandy soil under treatments of two grass planting systems(ryegrass rotation with sorghum-sudangrass hybrid and ryegrass seeding into a perennial bermudagrass stand) at low and high grazing densities. After 4 years of continuous treatments, soil total C and N contents across the 0–30 cm soil profile were 24.7% and 17.5% higher at the high than at the low grazing intensity, likely through promoting plant productivity and C allocation belowground as well as fecal and urinary inputs. Grass planting system effects were significant only at the low grazing intensity, with soil C, N, and microbial biomass and respiration in the top 10 cm being higher under the ryegrass/bermudagrass than under the ryegrass/sorghum-sudangrass hybrid planting systems. These results suggest that effective management could mitigate potential adverse effects of high grazing intensities on soil properties and facilitate sustainability of pastureland. | WANG Yi DUAN Wen-Xia C.TU S.WASHBURN CHENG Lei S.HU | 2014 | Pedosphere2014，24，3： | 6 |
| 2 | E-learning communities显示文摘 | C.Tu M.Corry | | 0，，02： | 1 |
| 3 | 数字化制造技术提升产品设计水平显示文摘十年前,人们还在讨论计算机集成制造系统(CIMS)的可行性,如今实用计算机集成制造技术(也称数字化制造技术)已被越来越多的企业所接受并应用到生产实践中。从产品的外观、结构及功能设计,到计算机辅助设计和制造(CAD/CAM)、快速成型和计算机辅助检测,数字化制造技术正向人们展示着它无穷的魅力。 | Sam C.Tu | 2002 | 现代制造2002，，12： | 1 |
| 4 | Assessment of COVID-19 aerosol transmission in a university campus food environment using a numerical method显示文摘With the prevalence of COVID-19,the phenomenon of viruses spreading through aerosols has become a focus of attention.Diners in university dining halls have a high risk of exposure to respiratory droplets from others without the protection of face masks,which greatly increases the risk of COVID-19 transmission.Therefore,the transmission mechanism of respiratory droplets in extremely crowded dining environments should be investigated.In this study,a numerical simulation of coughing at dining tables under two conditions was performed,namely the presence and absence of protective partitions,and the evaporation and condensation of aerosol droplets in the air were examined.By using the numerical method,we analyzed and verified the isolation effect of dining table partitions in the propagation of aerosol droplets.The effect of changes in room temperature on the diffusion of coughed aerosols when partitions were present was analyzed.We demonstrated how respiratory droplets spread through coughing and how these droplets affect others.Finally,we proposed a design for a dining table partition that minimizes the transmission of COVID-19. | M.Zhao C.Zhou T.Chan C.Tu Y.Liu M.Yu | 2022 | Geoscience Frontiers2022，13，6： | 1 |
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