Abstract Optimization of insulation on subsea oil and gas equipment can lead to significant cost weight reduction. A judicious combination commercially available Finite Element Analysis (FEA) software with evolutionary optimization algorithms efficiently serve this purpose. In the present study, a gate valve has been presented due emphasis methodology adapted. parameterized model several dimens...

Ordinary Portland cement (OPC) is currently the preferred material for creation of barriers in wells during their construction and abandonment globally. OPC, however, a very carbon-intensive with some inherent technical weaknesses. These include low casing-to-cement bond strength which may allow formation micro-annuli, turn can become conduit greenhouse gas transport (primarily methane, powerfu...

In the article structure and phase composition of material based on nano-and micro-sized cubic boron nitride (cBN) obtained under high pressure temperature conditions from mechanically activated graphite-like (hBN) in presence aluminum (Al), which plays role an initiator for transformation hBN → cBN, are investigated. It has been shown that use mechanical activation contributes to formation cBN...

Three finds of diamonds on the Ingul-Ingulets domain Ukrainian Shield are considered: in breccia-like rocks Gruzke area, eclogite-like basin Ingul River and Zeleny Gayi meteorite crater. A brief description these is made, which represent their different geological genetic types. Тhe veracity diamond findings origin crystals appreciated. It shown that 8 area differ size (0.2-1.4 mm), shape, colo...

Rat kallikrein-binding protein is a novel serine-proteinase inhibitor that forms a covalent complex with tissue kallikrein. We have purified rat kallikrein-binding protein and cloned the cDNA and the gene encoding rat kallikrein-binding protein [Chao, Chai, Chen, Xiong, Chao, Woodley-Miller, Wang, Lu and Chao (1990) J. Biol. Chem. 265, 16394-16401; Chai, Ma, Murray, Chao and Chao (1991) J. Biol...

Diabetes dalam kehamilan dapat meningkatkan berbagai risiko, baik pada maternal maupun neonatus. Adanya gangguan homeostasis glukosa terjadinya malformasi kongenital, keguguran, risiko preeklampsia, Cepalo Pelvik Dispropotion (CPD), kelahiran prematur, kelainan letak, plasenta previa dan hipoglikemia Oleh karena itu, diperlukan perhatian penanganan menyeluruh bagi ibu hamil yang menderita diabe...

The investigation on elemental carbon has long been of nanotubes to diamond at 4.5 GPa and 13008C using a considerable interest because of its great importance in six-anvil high pressure apparatus with the existence of both science and technology. One of the most outstanding NiMnCo catalyst. The detailed characterization conducted achievements which occurred in carbon science was the shows that...

Thanks to its extreme optical and electronic properties, diamond appears to be a promising semiconducting material for photon detection. Its wide band-gap, 5.5 eV, results in a very low leakage current and its electronic properties as high carrier mobility allow fast time response (J. E. Field, 1979). Besides, it has a large breakdown electric field (∼10 V/┤m), a low dielectric constant (i.e. l...

Synthetic commercial type-IIa diamond crystal containing low concentration of P1 (Ns0) centers ([Ns0] <1ppm) was examined as a possible calibration standard for evaluating microwave magnetic field intensity (B1) in the spectrometer cavity. The reliability this experimentally and theoretically tested by employing two different types cavities with distributions B1 values. procedure relies on ordi...