Abstract In order to improve the security of drilling progress and reduce reliability impact which caused by collision between drill string well wall, finite element analysis software ADINA is used establish a model simulate change stress after wellbore under different factors. The results show that existence fluid with higher viscosity, lower revolution speed autorotation larger annular space ...

Aerodynamic collision avoidance manoeuvres provide an opportunity for satellites in Low Earth Orbits to reduce the risk during close encounters. With rising numbers of and objects orbit, experience encounters more frequently. Especially those without thrusting capabilities face problem not being able performimpulsive evasive manoeuvres. For Orbits, though, perturbing forces due aerodynamic drag...

We report an electrochemical study of the collisions of single droplets in an emulsion by two methods. In the first method, an electroactive redox species, for example, ferrocene, inside a toluene-in-water emulsion droplet (but not in the continuous phase) is measured by chronoamperometry during a collision with an ultramicroelectrode (UME). Here, a blip or spike type of collision signal is obs...

Radio-frequency identification (RFID) communication system known as auto-id has experienced tremendous growth worldwide, considering as a flexible mechanism for identification of objects. Degradation of data transmission due to external interference and interference of RFID system itself (tags and reader collision) is one of the most important factors to restrict the development of the RFID sys...

We report a case of an esophageal collision tumor composed of adenocarcinoma and oat cell carcinoma. Both tumors appeared to arise from dysplastic Barrett's mucosae in a 75-year-old man. Immunohistochemical stains and electron microscopy demonstrated a separate identity for each of the tumors in collision. Molecular analysis of microsatellite regions was performed in different microdissected ar...

an inversion procedure is used to obtain from the extended principle of corresponding - states the pair interaction potentials for argon, krypton and its mixture over a tetnperature range from absolute zero to the onset of ionization. the experimentally-reduced viscosity collision integrals obtained from the corresponding - states correlation have been inverted directly to give the reduced-inte...

Multiple independent communications are studied on optical bus parallel computing models. These models make use of an optical bus interconnect to provide for communication in a multi-processor system. The communication traffic studied in this paper results in potential frequent bus collisions. The well known collision detect mechanism is ineffective however due to the communication pipelining a...