نتایج جستجو برای: high pressure engineering
تعداد نتایج: 2562983 فیلتر نتایج به سال:
As worldwide demand of hydrocarbon is growing fast, the oil and gas companies have been forced to explore reservoirs with more hostile conditions, such as high-pressure, high-temperature conditions. Improved technology, material selection and testing procedures are required to overcome the common problems in these conditions. One of the main phases of well construction is cementing job. Appropr...
We carried out detailed high-pressure Raman scattering studies on lead-free perovskite piezoceramics KNbO3 (KNO) with a smaller pressure interval so that the successive phase transition pressures are precisely determined (PO→T: 8.2 GPa; PT→C: 10.9 GPa). The pressure-quenched does not return to ambient orthorhombic completely. In this work, pressure-induced sequence is discussed in detail. Also,...
Background and Aim: High blood pressure is a health problem in children. High blood pressure is a health problem in children, increasing of blood pressure during childhood predisposes children to hypertension in later life stages. In addition, high blood pressure during childhood is a risk factor to atherosclerosis in future the present study was conducted to determine prevalence of high blood ...
There is an increasing realization that it may be impossible to attain Earth normal atmospheric pressures in orbital, lunar, or Martian greenhouses, simply because the construction materials do not exist to meet the extraordinary constraints imposed by balancing high engineering requirements against high lift costs. This equation essentially dictates that NASA have in place the capability to gr...
As we aim to develop more and more complex software systems for real-time applications, the concern about their safety and reliability is also growing. In my opinion, development of these systems require more formal approaches than the development of a general purpose software system. We can draw our analogy from hardware engineering for which we know that in order to develop high performance s...
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