Camouflage is one of the most widespread and powerful strategies that animals use to make detection/recognition more difficult. Many orb-web spiders of the genus Cyclosa add prey remains, plant debris, moults, and/or ...Camouflage is one of the most widespread and powerful strategies that animals use to make detection/recognition more difficult. Many orb-web spiders of the genus Cyclosa add prey remains, plant debris, moults, and/or eggsacs to their webs called web decorations. Web decorations resembling spider body colour pattern have been considered to camouflage the spider from predators. While this camouflage is obvious from a human＇s perspective, it has rarely been investigated from a predator＇s perspective. In this study, we tested the visibility of web decorations by calculating chromatic and achromatic contrasts of detritus and eggsae decorations built by Cyclosa octotubereulata, against four different backgrounds viewed by both bird （e.g., blue tits） and hymenopteran （e.g. wasps） predators. We showed that both juvenile and adult spiders on webs with detritus or egg-sac deco- rations were undetectable by both hymenopteran and bird predators over short and long distances. Our results thus suggest that decorating webs with detritus or eggsacs by C octotuberculata may camouflage the spiders from both hymenopteran and bird predators in their common habitats [Current Zoology 56 （3）： 379-387, 2010].展开更多
Cyber-crimes are growing rapidly,so it is important to obtain the digital evidence on the web page.Usually,people can examine the browser history on the client side and data files on the server side,but both of them h...Cyber-crimes are growing rapidly,so it is important to obtain the digital evidence on the web page.Usually,people can examine the browser history on the client side and data files on the server side,but both of them have shortcomings in real criminal investigation.To overcome the weakness,this paper designs a web page forensic scheme to snapshot the pages from web servers with the help of web spider.Also,it designs several steps to improve the trustworthiness of these pages.All the pages will be dumped in local database which can be presented as reliable evidence on the court.展开更多
The distinct network organization,management,service and operating characteristics of US Southwest Airlines are key elements of its success compared with other airlines.As a network organization type,the spider web ai...The distinct network organization,management,service and operating characteristics of US Southwest Airlines are key elements of its success compared with other airlines.As a network organization type,the spider web airline network has received more attention.In this paper,we analyzed the relation between the spider web airline network and spider web,and the structure of spider web airline network,built the assignment model of the spider web airline network,and investigated the economics concerned.展开更多
基金supported by a grant from NSFC (30770332)The Ministry of Education (MOE) Academic Research Fund (AcRF)(R-154-000-335-112)
文摘Camouflage is one of the most widespread and powerful strategies that animals use to make detection/recognition more difficult. Many orb-web spiders of the genus Cyclosa add prey remains, plant debris, moults, and/or eggsacs to their webs called web decorations. Web decorations resembling spider body colour pattern have been considered to camouflage the spider from predators. While this camouflage is obvious from a human＇s perspective, it has rarely been investigated from a predator＇s perspective. In this study, we tested the visibility of web decorations by calculating chromatic and achromatic contrasts of detritus and eggsae decorations built by Cyclosa octotubereulata, against four different backgrounds viewed by both bird （e.g., blue tits） and hymenopteran （e.g. wasps） predators. We showed that both juvenile and adult spiders on webs with detritus or egg-sac deco- rations were undetectable by both hymenopteran and bird predators over short and long distances. Our results thus suggest that decorating webs with detritus or eggsacs by C octotuberculata may camouflage the spiders from both hymenopteran and bird predators in their common habitats [Current Zoology 56 （3）： 379-387, 2010].
基金Sponsored by the National Natural Science Foundation of China(Grant No.61272540)the National Basic Research Program of China(973 Program)(Grant No.2013CB329604)+3 种基金the National High Technology Research and Development Program of China(Grant No.2012AA011005)the Natural Science Foundation of Anhui Province,China(Grant No.11040606M138 and No.1208085MF101)the Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.2011JYXJ1498)the Fundamental Research Funds for the Central Universities(Grant No.2011HGQC1012)
文摘Cyber-crimes are growing rapidly,so it is important to obtain the digital evidence on the web page.Usually,people can examine the browser history on the client side and data files on the server side,but both of them have shortcomings in real criminal investigation.To overcome the weakness,this paper designs a web page forensic scheme to snapshot the pages from web servers with the help of web spider.Also,it designs several steps to improve the trustworthiness of these pages.All the pages will be dumped in local database which can be presented as reliable evidence on the court.
基金supported by the Research Program of Civil Aviation Administration of China(No.MHRD0622)
文摘The distinct network organization,management,service and operating characteristics of US Southwest Airlines are key elements of its success compared with other airlines.As a network organization type,the spider web airline network has received more attention.In this paper,we analyzed the relation between the spider web airline network and spider web,and the structure of spider web airline network,built the assignment model of the spider web airline network,and investigated the economics concerned.
