Life history parameters of the primitively eusocial bee Augochlorella striata (Hymenoptera: Halictidae) are summarized for a population in central New York, and analyzed with respect to the evolutionary maintenance of eusociality in this species. High mortality (39%) of solitary foundresses and low mortality (12%) of social colonies indicate severe ecological constraints limiting independent (s...

It has been widely acknowledged that traditional packers will lose their elastic performance in the context of long periods operation due to plastic deformation. This paper introduce a swellable packer can reduce failure cases production effectively. The deformation rubber different media and temperatures analyzed. pressure test several under is carried out this paper. reasonable expansion clea...

Comprehensive information on fracture network properties around a borehole is indispensable for developing hydrogeological site descriptive model. However, such usually relies various cross-hole field tests at high cost. This study presents cost-effective option regarding the identification of density borehole. Based packer-test and drilling-core data from 104 boreholes in Taiwan mountainous ar...

Run-time packing is a technique employed by malware authors in order to conceal (e.g., encrypt) malicious code and recover it at run-time. In particular, some run-time packers only decrypt individual regions of code on demand, re-encrypting them again when they are not running. This technique is known as shifting decode frames and it can greatly complicate malware analysis. The first solution t...