The goal of this paper is to experimentally study the behavior nanofluid improve performance a circular heat pipe. Pure water and Al2O3-water based are used as working fluids. An experimental setup designed constructed pipe under different operating conditions. effect filling ratio, volume fraction nano-particles in base fluid, input rate on thermal resistance investigated. Total for pure also predicted. correlation obtained predict influence Prandtl number dimensionless transfer rate, Kq...

Journal Article The Action of N-Bromosuccinimide on Alcohols and Amines Get access M Z Barakat, Barakat Biochemistry Department, Faculty Medicine, Abbassia, Ibrahim Pasha El-Kebir University, Cairo, Egypt Search for other works by this author on: Oxford Academic Google Scholar G Mousa Pharmacy Pharmacology, Volume 4, Issue 1, September 1952, Pages 115–117, https://doi.org/10.1111/j.2042-7158.1952.tb13121.x Published: 12 April 2011 history Received: 25 May 1951

This paper presents a scalar volt per hertz (v/f) control technique for maximum power tracking of grid-connected wind-driven Brushless Doubly-Fed Reluctance Generator (BDFRG). The proposed generator has two stator windings namely; winding, directly connected to the grid, and grid through bi-directional converter. presented is based on abc-axis dq-axis dynamic model BDFRG. A detailed model, by which behaviour BDFRG can be successfully predicted under different operating conditions, presented....

This paper presents a scalar volt per hertz (V/f) control technique for maximum power tracking of grid-connected wind-driven brushless doubly fed reluctance generator (BDFRG). The proposed has two stator windings namely; winding, directly connected to the grid and through bi-directional converter. In order enhance performance scalar-control strategy, soft starting method is suggested avoid over-current Moreover, capability speed estimation sensorless also studied. validated using sample...

The performance enhancement of the thermoelectric cooler (TEC) by controlling working conditions is main target present experimental investigation. study handles variation most effective parameters through changing pulsating air flow introducing cases Womersley number (Wo); 0 ≤ Wo 41.28. magnetic field intensities Bo; 0.875 Bo 1.25 T, at different input current (I) from 4.6 to 7.4 Amp, 0.0542 kg/s mass rate. test section consists a set four TEC integrated with eight heat sinks, exposed...

This paper presents a sensorless scalar volt per hertz (v/f) control technique for maximum power tracking of grid-connected wind-driven Brushless Doubly-Fed Reluctance Generator (BDFRG). The proposed generator has two stator windings namely; winding, directly connected to the grid, and grid through bi-directional converter. capability wind-power extraction is based mainly upon validity BDFRG speed-estimation approach. A simple cost-effective approach presented. In order enhance performance...

Cyclic Voltammetry of bismuth nitrate (BN) using different concentrations was practically measured by the use DY2000 potenstiostat. We used 0.1 M KNO3 as a transporting medium for diffusion ions glassy carbon electrode (GCE). Moreover, it prepared in our laboratory, well polished and washed before use. Besides, Ag/AgCl reference auxiliary platinum were also used. Scan rates redox reactions studied presence absence methyl red. The complexation interaction between red (MR) studied. reactions’...

This paper proposes a vector-control (power-winding flux orientation) strategy for maximum wind-power extraction of grid-connected wind-driven Brushless Doubly-Fed Reluctance Generator (BDFRG) system. The adopted generator has two stator windings namely; power winding, directly connected to the grid, and control grid through bi-directional converter. In addition, unity power-factor operation is also provided based on proposed strategy. Moreover, soft starting method suggested avoid...

This paper proposes a vector-control technique of grid-connected wind-driven Brushless Doubly Fed Reluctance Generator (BDFRG) for maximum wind-power extraction under three strategies, summarised as unity power-factor operation, minimum converter current and copper losses. The adopted generator has two stator windings namely; power winding, directly connected to the grid, control grid through bi-directional converter. In addition, soft starting method is suggested avoid employed...

For energy saving in Electric Vehicles (EVs), high kinetic could be exploited by designing a regenerative braking control of traction machine and usage hybrid storage system (HESS). This paper presents strategy an Induction Motor (IM) drive. is composed two stages. First, field-oriented speed developed at running modes. Second, power distribution technique proposed to share the between battery ultracapacitor (UC) HESS via DC-DC converter with buck-boost In motoring operation i.e. discharge...

Abstract Thermoelectric coolers (TECs) have been used for cooling electrical elements of high dissipating energy to provide a fixed temperature, with the advantages being reliable, noiseless, tightly packed, no moving parts as well harmful gases. As performance TECs is required, developed emerging thermoelectric (TE) materials can be employed enhance their performance. Hence, this study provides an experimental investigation effect different operational parameters on TE system including...

The low energy levels of 197 Au and 199 have been investigated by means a high resolution double focusing beta-ray spectrometer. conversion electron ratios as well the K-conversion coefficients low-lying transitions were determined. K-internal 191 keV transition in indicated no EO contribution. level structure lower excited states are discussed terms existing nuclear models.

This work provides a theoretical investigation to study the effect of different operational parameters on performance TE cooling system including COP and rate heat transfer.The investigated are, applied input power, inlet working fluid velocity, arrangement utilized TECs modules type.The geometry is created with ANSYS multi-physics software as two-dimensional base case, it consisted from two attached horizontal ducts length (520 mm) (560 mm), interface surface between contains three...

This paper proposes a vector-control technique of grid-connected wind-driven Brushless Doubly-Fed Reluctance Generator (BDFRG) for maximum wind-power extraction under two strategies summarized as; unity power-factor operation and minimum converter-current. The adopted generator has stator windings namely; power winding, directly connected to the grid, control grid through bi-directional converter. In addition, soft-starting method is suggested avoid employed converter over-current. first...

this paper presents the results of a comparison between experimental work and artificial neural network for analysis thermoelectric cooler performance. It is implemented using Matlab real data obtained from works. The intelligence techniques are intensively used as an alternatives to classical model systems. carried out investigate performance under effect pulsating forced convective air flow at different rates input electrical power in rectangular cross -sectional channel. experiments were...

Forced convection heat transfer for pulsating flow inside a horizontal hot cylinder partially filled with porous medium is experimentally investigated. The outer surface of the tested exposed to saturated steam maintain its at constant wall temperature. experimental work performed laminar water cylinder. As steady and different frequencies. Carbon steel balls 6.35 mm diameter are used as particles, which filling cylinder. An set-up designed constructed perform this aim investigating effect...

The primary objective of this paper is to present a new concept fibrewise topological spaces over B is said be slightly B. Also, we introduce the concepts fibrewise slightly perfect spaces, filter base, contact point, convergent, directed toward set, adherent rigid, weakly closed, H.set, fibrewise almost perfect, slightly∗ .continuous slightly∗ topological respectively, slightly Te, locally QHC, In addition, state and prove several propositions related these concepts.

The gamma transitions in 177 Hf have been measured using a 50cm radius iron-free double focusing beta-ray spectrometer. decay scheme is investigated and the K-conversion coefficients of 208 321 keV determined. Comparison with theoretical conversion for pure El radiation calculated by Sliv Band indicates that process transition normal while large anomaly observed 32l E1 compatible M2 admixture or more probable presence penetration matrix elements. From comparison 113 M1+E2 has found to be...