New and little known Laimydorinae species from Fynbos in the south-western Cape (Nematoda: Dorylaimidae)

Calcaridorylaimus sirgeli n.sp. is described from Cape Fynbos in mountains in the south-western Cape Province. It differs from all known species in the genus by the presence of advulval ornamentation, and is compared in detail with Calcaridorylaimus signatus (Loot, 1975) and Calcaridorylaimus ruwenzorii (De Coninck, 1935). A single specimen of Drepanodoryiaimus williamsi (Heyns & Kruger, 1983) is compared with specimens from the Transvaal and Mauritius. Mesodorylaimus sp. cf. graciosus Andràssy, 1986 is reported from South Africa for the first time

Sensitivity analysis of combined cycle parameters on exergy, economic, and environmental of a power plant

In this paper, a typical combined cycle power generation unit in Iran is simulated by a mathematical method in order to perform sensitivity analysis on environmental emission and electricity price. The results of this study demonstrate that the efficiency of the power plant depends on both gas turbine design parameters such as gas turbine inlet temperature, compressor pressure ratio and steam cycle design parameters such as HRSG pinch point temperature, condenser pressure. The results demonstrate that an increase in TIT and compressor pressure ratio have a significant effect on exergy efficiency and destruction.http://link.springer.com/journal/109732020-05-28hj2020Mechanical and Aeronautical Engineerin

Testicular function after torsion of the spermatic cord

[No abstract available]Short Surve

Thermal analysis of porous fins enclosure with the comparison of analytical and numerical methods

In this study, heat transfer though a porous fin with rectangular cross section is investigated. The Darcy model is utilized to simulate heat transfer in this porous media. It is assumed that the fin is one-dimensional, homogenous, the flow is laminar, and the generated heat is a linear function of temperature. In this research, three different analytical methods are used to obtain the temperature distribution after deriving the heat transfer equation. In order to validate the obtained solution the collocation method (CM) is compared with the results by a numerical method, in order to validate the solutions, homotopy perturbation method (HPM) and homotopy analysis method (HAM) are employed. This problem is solved for the general case, and the output is obtained as a relationship for one iteration. The effects of various parameters including convection (Nc), porosity (Sh), Rayleigh number (Ra) are examined in this research.http://link.springer.com/journal/109732020-04-26hj2020Mechanical and Aeronautical Engineerin

Thermal and plasma enhanced atomic layer deposition of Al2O3on GaAs substrates

A good dielectric layer on the GaAs substrate is one of the critical issues to be solved for introducing GaAs as a candidate to replace Si in semiconductor processing. In literature, promising results have been shown for Al2O 3on GaAs substrates. Therefore, atomic layer deposition (ALD) of Al2O3has been studied on GaAs substrates. We have been investigating the influence of the ALD process (thermal vs plasma-enhanced ALD) as well as the influence of the starting surface (no clean vs partial removal of the native oxide). Ellipsometry and total X-ray reflection fluorescence were applied to study the growth of the ALD layers. Angle-resolved X-ray photoelectron spectroscopy was used to determine the composition of the interlayer. Both processes were shown to be roughly independent of the starting surface with a minor dependence for the thermal ALD. Thermally deposited ALD layers exhibited better electrical characteristics based on capacitance measurements. This could be linked to the thinner interlayer observed for thermally deposited Al2 O3. However, the Fermi level was not unpinned in all cases, suggesting that more work needs to be done for passivating the interface between GaAs and the high- k layer. © 2009 The Electrochemical Society