英国著名现代女作家、诗人萨克维尔—韦斯特(V.Sackville—West)在她的晚期小说《海上无路标》(No Signposts in the Sea)中塑造了一个游弋在心理世界的典型人物——埃德蒙·卡尔(Edmund Carr)。本文要讨论的就是这个人物的思维风格...英国著名现代女作家、诗人萨克维尔—韦斯特(V.Sackville—West)在她的晚期小说《海上无路标》(No Signposts in the Sea)中塑造了一个游弋在心理世界的典型人物——埃德蒙·卡尔(Edmund Carr)。本文要讨论的就是这个人物的思维风格(Mindstyle)。展开更多
With the Tanghe Diversion Channel in Tibet as an example, the theoretical study on the ice control effect of the solar sacks was conducted based on the previous study. The numerical simulation method was adopted and a...With the Tanghe Diversion Channel in Tibet as an example, the theoretical study on the ice control effect of the solar sacks was conducted based on the previous study. The numerical simulation method was adopted and a one-dimensional numerical model for ice crystal in diversion channels in high-altitude cold regions was developed in this article. The heat transfer through the air-water interface and the mass transfer between ice and water were considered in the model. The model was validated by the field observation data on the diversion channel of the Tanghe Hydropower Station. The results show that the ice control effect of the solar sacks is obvious in the channel with large mass flow rate in the high-altitude cold regions.展开更多
As a result of the exponential growing rate of worldwide Internet usage, satellite systems are required to support broadband Internet applications. The transmission control protocol （TCP） which is widely used in the...As a result of the exponential growing rate of worldwide Internet usage, satellite systems are required to support broadband Internet applications. The transmission control protocol （TCP） which is widely used in the Internet, performs very well on wired networks. However, in the case of satellite channels, clue to the delay and transmission errors, TCP performance degrades significantly and bandwidth of satellite links can not be fully utilized. To improve the TCP performance, a new idea of placing a TCP spoofing proxy in the satellite is considered. A Novel Satellite Transport Protocol （NSTP） which takes advantage of the special properties of the satellite channel is also proposed. By using simulation, as compared with traditional TCPs, the on-board spoofing proxy integrated with the special transport protocol can significantly enhance throughput performance on the high BER satellite link, the time needed to transfer files and the bandwidth used in reverse path are sharply reduced.展开更多
利用CiteSpace软件对Web of Science数据库中道德地理相关文献进行共被引分析和关键词共现分析,对比人工检索和文献阅读的结果,对西方道德地理的研究进展进行系统梳理评述。研究结论:①对高中心性和高突现性文献的研究发现,关怀、伦理...利用CiteSpace软件对Web of Science数据库中道德地理相关文献进行共被引分析和关键词共现分析,对比人工检索和文献阅读的结果,对西方道德地理的研究进展进行系统梳理评述。研究结论:①对高中心性和高突现性文献的研究发现,关怀、伦理、道德、责任等关键词和远距离的关怀与责任、道德经济与道德消费、地方政治中的不平等与权利问题等三大研究主题构成了道德地理研究的一大理路,侧重阐释“道德的地理”;②早期道德地理著名学者Sack的系列论著并未能成为高引文献,原因一在于其理论的高度抽象和隐晦难解,二在于他试图建构普适的空间道德评判标准,因而很难被实证主义研究者们理解和追随,但他构建的“二元道德论”强调“地理的道德”,是道德地理研究的另一条理路,可以为评判地方道德提供了全面、明确而实用的标准,值得被后续研究发展和深化;③研究同时揭示:囿于数据库数据和技术手段的限制,单纯依靠文献分析软件的研究方式可能会出现偏差,高质量的人工检索阅读仍是文献研究的必然路径。展开更多
Curing of freshly harvested yams (Dioscorea spp.) is a process for wounded yams during harvest to heal. In this work the effectiveness of straw, polypropylene and jute sack on curing of seven key farmers’ yam varieti...Curing of freshly harvested yams (Dioscorea spp.) is a process for wounded yams during harvest to heal. In this work the effectiveness of straw, polypropylene and jute sack on curing of seven key farmers’ yam varieties over a duration of 7, 14 and 21 days was studied. Seven key farmers’ yam varieties identified as Pona, Lariboko, Dente, Mutwumudoo, Serwah belonging to D. rotundata, Matches and Akaba belonging to D. alata were studied under different curing treatments. The percentage weight loss of yam tubers varied among the treatments over curing period. Curing under jute sack showed all yam varieties had weight losses less than 2.0%, within 7 days of curing. Five different varieties had weight loss less than 2.0% except Dente under the straw treatment. Mutwumudoo variety showed the highest water loss (8.4%) for polypropylene sheet and 6.9% for Lariboko in the control treatment. During 7 days curing the control and polypropylene treatment did not support yam curing. After 14 days of curing of tubers, similar tends were observed as in 7 days curing. After 14 days of curing under jute sack, percentage weight loss of the tubers ranges from 2.0% - 3.7%. In the straw treatment, the percentage weight loss ranges between 1.0% - 4.7% in all other varieties except Dente (D. rotundata) (8.2%). Polypropylene sheet treatment showed the highest percentage weight loss in Mutwumudoo variety (18.4%). A similar trend was observed for the yam tubers cured for 21days as percentage weight loss of tubers under jute sacks was 2.5 – 9.8%. Curing temperature and humidity ranged between 27°C - 40°C and 87% - 100% rh for yam tubers under the three different treatments of polypropylene, jute and straw. However, the control treatment recorded lower humidity of 60% - 80% rh. Curing material, duration, climatic conditions and yam varieties influenced curing and Serwah variety, which is a D. rotundata is the best bet yam variety to cure under jute sack for 7, 14 and 21 days of curing.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No.50469002).
文摘With the Tanghe Diversion Channel in Tibet as an example, the theoretical study on the ice control effect of the solar sacks was conducted based on the previous study. The numerical simulation method was adopted and a one-dimensional numerical model for ice crystal in diversion channels in high-altitude cold regions was developed in this article. The heat transfer through the air-water interface and the mass transfer between ice and water were considered in the model. The model was validated by the field observation data on the diversion channel of the Tanghe Hydropower Station. The results show that the ice control effect of the solar sacks is obvious in the channel with large mass flow rate in the high-altitude cold regions.
文摘As a result of the exponential growing rate of worldwide Internet usage, satellite systems are required to support broadband Internet applications. The transmission control protocol （TCP） which is widely used in the Internet, performs very well on wired networks. However, in the case of satellite channels, clue to the delay and transmission errors, TCP performance degrades significantly and bandwidth of satellite links can not be fully utilized. To improve the TCP performance, a new idea of placing a TCP spoofing proxy in the satellite is considered. A Novel Satellite Transport Protocol （NSTP） which takes advantage of the special properties of the satellite channel is also proposed. By using simulation, as compared with traditional TCPs, the on-board spoofing proxy integrated with the special transport protocol can significantly enhance throughput performance on the high BER satellite link, the time needed to transfer files and the bandwidth used in reverse path are sharply reduced.
文摘利用CiteSpace软件对Web of Science数据库中道德地理相关文献进行共被引分析和关键词共现分析,对比人工检索和文献阅读的结果,对西方道德地理的研究进展进行系统梳理评述。研究结论:①对高中心性和高突现性文献的研究发现,关怀、伦理、道德、责任等关键词和远距离的关怀与责任、道德经济与道德消费、地方政治中的不平等与权利问题等三大研究主题构成了道德地理研究的一大理路,侧重阐释“道德的地理”;②早期道德地理著名学者Sack的系列论著并未能成为高引文献,原因一在于其理论的高度抽象和隐晦难解,二在于他试图建构普适的空间道德评判标准,因而很难被实证主义研究者们理解和追随,但他构建的“二元道德论”强调“地理的道德”,是道德地理研究的另一条理路,可以为评判地方道德提供了全面、明确而实用的标准,值得被后续研究发展和深化;③研究同时揭示:囿于数据库数据和技术手段的限制,单纯依靠文献分析软件的研究方式可能会出现偏差,高质量的人工检索阅读仍是文献研究的必然路径。
文摘Curing of freshly harvested yams (Dioscorea spp.) is a process for wounded yams during harvest to heal. In this work the effectiveness of straw, polypropylene and jute sack on curing of seven key farmers’ yam varieties over a duration of 7, 14 and 21 days was studied. Seven key farmers’ yam varieties identified as Pona, Lariboko, Dente, Mutwumudoo, Serwah belonging to D. rotundata, Matches and Akaba belonging to D. alata were studied under different curing treatments. The percentage weight loss of yam tubers varied among the treatments over curing period. Curing under jute sack showed all yam varieties had weight losses less than 2.0%, within 7 days of curing. Five different varieties had weight loss less than 2.0% except Dente under the straw treatment. Mutwumudoo variety showed the highest water loss (8.4%) for polypropylene sheet and 6.9% for Lariboko in the control treatment. During 7 days curing the control and polypropylene treatment did not support yam curing. After 14 days of curing of tubers, similar tends were observed as in 7 days curing. After 14 days of curing under jute sack, percentage weight loss of the tubers ranges from 2.0% - 3.7%. In the straw treatment, the percentage weight loss ranges between 1.0% - 4.7% in all other varieties except Dente (D. rotundata) (8.2%). Polypropylene sheet treatment showed the highest percentage weight loss in Mutwumudoo variety (18.4%). A similar trend was observed for the yam tubers cured for 21days as percentage weight loss of tubers under jute sacks was 2.5 – 9.8%. Curing temperature and humidity ranged between 27°C - 40°C and 87% - 100% rh for yam tubers under the three different treatments of polypropylene, jute and straw. However, the control treatment recorded lower humidity of 60% - 80% rh. Curing material, duration, climatic conditions and yam varieties influenced curing and Serwah variety, which is a D. rotundata is the best bet yam variety to cure under jute sack for 7, 14 and 21 days of curing.
