The seals are the important component of the aircraft engine to prevent leakage of gas or oil. Because the contact and friction problems have a great influence on the performance of the seals, the concept and theory of tribology is already widely applied in research and design processes of advanced seals. This report selected three kinds of representative seals which are co...

The presen~e of liquids in a ~ompressor valve environment is a major fa~tor in the life of a valve or sealing element. The nature of the fluid, the quantity in the system and the distribution of the fluid are of major ~onsequen~e. Through the use of modelling techniques these influen~es are analyzed, specifi~ally th~ affe~t of geo•etry on the sti~king effect. Several solutions to redu~e the eff...

Miniature infrared cameras have recently come to market in a form factor that facilitates packaging in endoscopic or other minimally invasive surgical instruments. If absolute temperature measurements can be made with these cameras, they may be useful for non-contact monitoring of electrocautery-based vessel sealing, or other thermal surgical processes like thermal ablation of tumors. As a firs...

The correct design of the engagement pair (mainrotor and gaterotor) profile is the foundation to improve the operating reliability of a single screw compressor. An introduction to take a straight line enveloping pair as the engagement pair of the main machine is presented after analysing the present engagement pair. A complete analysis is also made of the hydrodynamic lubrication property and i...

Tissue formation around the electrode array of a cochlear implant has been suggested to influence preservation of residual hearing as well as electrical hearing performance of implanted subjects. Further, inhomogeneity in the electrical properties of the scala tympani shape the electrical field and affect current spread. Intracochlear trauma due to electrode insertion and the insertion site its...

Deinococcus radiodurans RNA ligase (DraRnl) is the founding member of a family of end-joining enzymes encoded by diverse microbes and viruses. DraRnl ligates 3'-OH, 5'-PO4 nicks in double-stranded nucleic acids in which the nick 3'-OH end is RNA. Here we gauge the effects of 3'-OH and 5'-PO4 base mispairs and damaged base lesions on the rate of nick sealing. DraRnl is indifferent to the identit...

Soil sealing (loss of soil resources due to extensive land covering for the purpose of house building, road construction etc.) and subsequent soil landscape pattern changes constitute typical environmental problems in many places worldwide. Previous studies concentrated on soil sealing in urbanized regions, whereas rural areas have not been given sufficient attention. Accordingly, this paper st...

Conflicts of interest: none. aBstRact objectives: To analyze the operative time, length of hospitalization and cost, as well as the bleeding and pain observed during the postoperative period, of thyroidectomy procedures using vessel sealing, harmonic scalpel or the conventional technique. methods: Retrospective analysis of thyroidectomies performed between 2007 and 2010 using either the convent...

A stainless steel, six-inch valve capable of closing in apprcximately 10 milliseconds has been developed at the Stanford Linear Accelerator Center. The valve will be automatically and zemotely operable, allowing it to be used in the S:dC be:nl switchyard area where high radi,tion levels wil:. prohi,it personnel pccess. The 7roblLdns of '.rigge-ing mechanical release, Lalve gute acceleratior and...

STATEMENT OF THE PROBLEM Alkaline pH can affect the physical and chemical properties and sealing ability of apical plug material. Calcium hydroxide is used as an intracanal medication to complete disinfection of root canals. It raises the pH of environment to alkaline value. PURPOSE The aim of this in vitro study was to evaluate and compare the effect of alkaline pH on the sealing ability of ...