随着农村改厕的不断推进,截至2017年底三格化粪池厕所的数量超过8 000万个,在无害化卫生厕所中占比最大。三格化粪池不消耗动力,无害化程度高,因此深入了解化粪池对于农村改厕具有重要意义。为此通过Derwent Data Analyzer软件对中国、...随着农村改厕的不断推进,截至2017年底三格化粪池厕所的数量超过8 000万个,在无害化卫生厕所中占比最大。三格化粪池不消耗动力,无害化程度高,因此深入了解化粪池对于农村改厕具有重要意义。为此通过Derwent Data Analyzer软件对中国、美国和日本的化粪池专利进行聚类分析,介绍了"厕所+化粪池+粪污利用"和"水冲厕所+化粪池+污水处理"2种改厕模式下化粪池技术的发展现状。通过分析总结,认为粪污资源化是农村化粪池未来重要发展方向,负压微水冲的节水技术和粪便减量化技术等可促进资源化,同时可采取"化粪池+"技术等改善粪便污水的处理效果。展开更多
分组传送网(Packet Transport Network,PTN)能够兼容多种网络,诸如ATM、SDH、以太网、PDH、PPP/HDLC等,被广泛地应用到各种组网通信,PTN能够有机地结合数据技术和传输技术,使运营商的基础网络优势得到很大程度的提高。目前,分组传送网(P...分组传送网(Packet Transport Network,PTN)能够兼容多种网络,诸如ATM、SDH、以太网、PDH、PPP/HDLC等,被广泛地应用到各种组网通信,PTN能够有机地结合数据技术和传输技术,使运营商的基础网络优势得到很大程度的提高。目前,分组传送网(PTN)在多网络通讯、传输带宽、流量、信息安全等方面无法满足用户需求,文中设计出新型的PTN网络安全架构,根据业务及流量选择架构类型,并引入融入OTN核心组网和p-Cycle保护算法,通过使用OTN核心组网方案,使汇聚机房带宽和数据传输能力大大提高,具有较强的扩容能力,通过使用p-Cycle保护算法并构建组网拓扑图,提高了PTN网络信息数据传递的安全性能。文中还设计出PTN组网软件架构,便于用户应用、查询。实验表明,设计的方案大大降低了组网难度,提高了网络速度、服务质量,具有较好的网络可扩展性和安全性。展开更多
Reverse time migration (RTM) is an indispensable but computationally intensive seismic exploration technique. Graphics processing units (GPUs) by NVIDIA■offer the option for parallel computations and speed improvemen...Reverse time migration (RTM) is an indispensable but computationally intensive seismic exploration technique. Graphics processing units (GPUs) by NVIDIA■offer the option for parallel computations and speed improvements in such high-density processes. With increasing seismic imaging space, the problems associated with multi-GPU techniques need to be addressed. We propose an efficient scheme for multi-GPU programming based on the features of the compute-unified device Architecture (CUDA) using GPU hardware, including concurrent kernel execution, CUDA streams, and peer-to-peer (P2P) communication between the different GPUs. In addition, by adjusting the computing time for imaging during RTM, the data communication times between GPUs become negligible. This means that the overall computation effi ciency improves linearly, as the number of GPUs increases. We introduce the multi-GPU scheme by using the acoustic wave propagation and then describe the implementation of RTM in tilted transversely isotropic (TTI) media. Next, we compare the multi-GPU and the unifi ed memory schemes. The results suggest that the proposed multi- GPU scheme is superior and, with increasing number of GPUs, the computational effi ciency improves linearly.展开更多
文摘随着农村改厕的不断推进,截至2017年底三格化粪池厕所的数量超过8 000万个,在无害化卫生厕所中占比最大。三格化粪池不消耗动力,无害化程度高,因此深入了解化粪池对于农村改厕具有重要意义。为此通过Derwent Data Analyzer软件对中国、美国和日本的化粪池专利进行聚类分析,介绍了"厕所+化粪池+粪污利用"和"水冲厕所+化粪池+污水处理"2种改厕模式下化粪池技术的发展现状。通过分析总结,认为粪污资源化是农村化粪池未来重要发展方向,负压微水冲的节水技术和粪便减量化技术等可促进资源化,同时可采取"化粪池+"技术等改善粪便污水的处理效果。
文摘分组传送网(Packet Transport Network,PTN)能够兼容多种网络,诸如ATM、SDH、以太网、PDH、PPP/HDLC等,被广泛地应用到各种组网通信,PTN能够有机地结合数据技术和传输技术,使运营商的基础网络优势得到很大程度的提高。目前,分组传送网(PTN)在多网络通讯、传输带宽、流量、信息安全等方面无法满足用户需求,文中设计出新型的PTN网络安全架构,根据业务及流量选择架构类型,并引入融入OTN核心组网和p-Cycle保护算法,通过使用OTN核心组网方案,使汇聚机房带宽和数据传输能力大大提高,具有较强的扩容能力,通过使用p-Cycle保护算法并构建组网拓扑图,提高了PTN网络信息数据传递的安全性能。文中还设计出PTN组网软件架构,便于用户应用、查询。实验表明,设计的方案大大降低了组网难度,提高了网络速度、服务质量,具有较好的网络可扩展性和安全性。
基金supported by the National Key R&D Program of China(2017YFC0602204-01)NSFC(Grant Nos.41530321 and 41104083)
文摘Reverse time migration (RTM) is an indispensable but computationally intensive seismic exploration technique. Graphics processing units (GPUs) by NVIDIA■offer the option for parallel computations and speed improvements in such high-density processes. With increasing seismic imaging space, the problems associated with multi-GPU techniques need to be addressed. We propose an efficient scheme for multi-GPU programming based on the features of the compute-unified device Architecture (CUDA) using GPU hardware, including concurrent kernel execution, CUDA streams, and peer-to-peer (P2P) communication between the different GPUs. In addition, by adjusting the computing time for imaging during RTM, the data communication times between GPUs become negligible. This means that the overall computation effi ciency improves linearly, as the number of GPUs increases. We introduce the multi-GPU scheme by using the acoustic wave propagation and then describe the implementation of RTM in tilted transversely isotropic (TTI) media. Next, we compare the multi-GPU and the unifi ed memory schemes. The results suggest that the proposed multi- GPU scheme is superior and, with increasing number of GPUs, the computational effi ciency improves linearly.
