scholarly journals The Globalization of the Egyptian Cotton Spinning Industry via Engineering units. Part 2: The Impact of the Latest Generation of Egyptian Cotton on the Quality Factor of its Yarn

2021 ◽  
Author(s):  
Wael A. Hashima ◽  
Ibrahim A. Elhawary
Keyword(s):  
Quality Factor ◽  
The Impact ◽  
Egyptian Cotton

scholarly journals Impact of Superconductors’ Properties on the Measurement Sensitivity of Resonant-Based Axion Detectors

Instruments ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Andrea Alimenti ◽  
Kostiantyn Torokhtii ◽  
Daniele Di Gioacchino ◽  
Claudio Gatti ◽  
Enrico Silva ◽  
...  
Keyword(s):  
Quality Factor ◽  
Cold Dark Matter ◽  
Vortex Motion ◽  
Lateral Wall ◽  
Measurement Sensitivity ◽  
Frequency Magnetic Field ◽  
Order Of Magnitude ◽  
Temperature Ranges ◽  
Quality Factor Q ◽  
The Impact

Axions, hypothetical particles theorised to solve the strong CP problem, are presently being considered as strong candidates for cold dark matter constituents. The signal power of resonant-based axion detectors, known as haloscopes, is directly proportional to their quality factor Q. In this paper, the impact of the use of superconductors on the performances of haloscopes is studied by evaluating the obtainable Q. In particular, the surface resistance Rs of NbTi, Nb3Sn, YBa2Cu3O7−δ, and FeSe0.5Te0.5 is computed in the frequency, magnetic field, and temperature ranges of interest, starting from the measured vortex motion complex resistivity and the screening lengths of these materials. From Rs, the quality factor Q of a cylindrical haloscope with copper conical bases and a superconductive lateral wall, operating with the TM010 mode, is evaluated and used to perform a comparison of the performances of the different materials. Both YBa2Cu3O7−δ and FeSe0.5Te0.5 are shown to improve the measurement sensitivity by almost an order of magnitude, with respect to a whole Cu cavity, while NbTi is shown to be suitable only at lower frequencies (<10 GHz). Nb3Sn can provide an intermediate improvement of the whole spectrum of interest.

Modal analysis of violin bodies with back plates made of different wood species

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 7687-7713
Author(s):  
Vasile Ghiorghe Gliga ◽  
Mariana Domnica Stanciu ◽  
Silviu Marian Nastac ◽  
Mihaela Campean
Keyword(s):  
Modal Analysis ◽  
Quality Factor ◽  
Wood Species ◽  
Natural Frequencies ◽  
Musical Instrument ◽  
Experimental Modal Analysis ◽  
Acoustic Properties ◽  
Spectral Components ◽  
The Impact

This research investigated the potential of some European wood species for use in the manufacturing of the back plates of violins as an alternative to the quite rare curly maple wood. An experimental modal analysis was employed for this purpose using the impact hammer method. The modal analysis was performed both on the top and back plates, as individual structures, and then after being integrated into the violin body. The modal analysis envisaged the determination of the eigenfrequencies (natural frequencies), the number of spectral components, and the quality factor, as important indicators of the acoustic performances of a musical instrument. A multi-criteria analysis based on the values obtained for these indicators allowed interesting findings concerning the acoustic properties of the selected wood species (hornbeam, willow, ash, bird-eye maple, walnut, and poplar). Same as curly maple, they all have special aesthetics, but only hornbeam, willow, and ash wood proved to have acoustic potential as well.

Effect of Disperse Reinforcement on the Structural Quality Factor of Vibrated and Centrifuged Concretes on the Сombined Aggregate

2019 ◽  
Vol 974 ◽  
pp. 283-287
Author(s):  
Evgeniy M. Shcherban ◽  
Albert Yu. Prokopov ◽  
Sergey A. Stelmakh ◽  
Anatoliy I. Shuyskiy
Keyword(s):  
Quality Factor ◽  
Steel Fiber ◽  
Density Ratio ◽  
Crushed Stone ◽  
Structural Quality ◽  
Manufacturing Method ◽  
The Impact ◽  
Disperse Reinforcement

The article considers and evaluates the impact of dispersed reinforcement of vibrated and centrifuged concretes manufactured with various types of fibers on their strength-density ratio. The authors considered the application of such a recipe manufacturing method as combining aggregates by the example of heavyweight aggregate - crushed stone and light aggregate - expanded clay aggregate for these concretes. Registered strength-density ratio of centrifuged fibrous concretes with a combined aggregate is higher than vibrated concretes with the same composition of the studied fibers. The highest growth of the strength-density ratio for the centrifuged fibrous concretes as compared with the vibrated ones was identified in case of dispersed reinforcement with steel fiber.

Application of Negative Resistance in the Inductor Feedback Oscillators Based on Multisim

2014 ◽  
Vol 556-562 ◽  
pp. 1898-1901
Author(s):  
Yu Lei ◽  
Jian Feng Ai
Keyword(s):  
Quality Factor ◽  
Negative Resistance ◽  
Circuit Performance ◽  
Oscillation Circuit ◽  
Start Up ◽  
Loss Resistance ◽  
In Series ◽  
Quality Factor Q ◽  
The Impact ◽  
The Ideal

By analyzing three-point oscillator of inductance feedback with the loss resistance of the inductor,we found the loss resistance of the inductor is a major factor in affecting circuit performance. Negative resistance in series with loss resistance can offset the impact of the loss resistance in the circuit. Oscillation circuit Start-up easilier. The quality factor Q increases and the selectivity is better.The oscillation shape closer to the ideal oscillator.

Rounded Square Ring Resonator Based Add Drop Filter for Wdm Applications Using Two Dimensional Photonic Crystals

2021 ◽  
Author(s):  
Massoudi Radhouene ◽  
V R Balaji ◽  
Monia Najjar ◽  
S Robinson ◽  
Vijay Janyani ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Quality Factor ◽  
Wavelength Division Multiplexing ◽  
Ring Resonator ◽  
Filter Design ◽  
Structural Parameters ◽  
Transmission Efficiency ◽  
Square Lattice ◽  
Two Dimensional ◽  
The Impact

Abstract In this paper, two dimensional photonic crystal based Add Drop filter is designed for DWDM applications. The existing work concentrate in Coarse Wavelength Division Multiplexing (CWDM) and few filter design with DWDM with non-uniform channel spacing, and low quality factor. . The proposed Add Drop Filter (ADF) enhances the quality factor using Rounded Square Ring Resonator (RSRR) for ensuring efficient bandwidth in supporting WDM systems. The design consists of bus waveguide, drop waveguide and RSRR with inner quasi-square ring in the square lattice while dielectric constant of the Si rod is 11.68 which are hosted in the air. The line defect was created by removing 4 rods (Quasi ring) in the center of the inner square ring. The line defects in the cavity help to reduce the radiation field components surrounded by the resonator. The proposed design drops the unique wavelength 1636.2 nm from a spectrum. The performance parameters of ADF are investigated using 2D Finite Difference Time Domain (FDTD) algorithm. The proposed ADF drops the narrow bandwidth of 0.7 nm, high quality factor of 2337, dropping efficiency (ON State) of 100 %, which is highly sufficient to support WDM systems for future Photonic Integrated Circuits (PIC). Further, the impact of functional parameters such as transmission efficiency, quality factor, bandwidth are investigated by varying the structural parameters, namely, adjacent rod radius, scatterer rod radius, coupling rod radius, lattice constant, inner rod radius and rod radius. The size of the device is 412.76 µm2.

scholarly journals Impact of Agricultural Policies on the Egyptian Cotton Sector Using Policy Analysis Matrix

2020 ◽  
pp. 50-59
Author(s):  
Mohamed A. ELsamie ◽  
Tarek Ali ◽  
Moataz Eliw
Keyword(s):  
Policy Analysis ◽  
Economic Performance ◽  
Agricultural Policies ◽  
Foreign Markets ◽  
Cotton Crop ◽  
The Government ◽  
The Impact ◽  
Egyptian Cotton ◽  
Policy Analysis Matrix ◽  
Nominal Protection

The Egyptian cotton sector is considered one of the most important export strategic sectors in Egypt, where the Egyptian government takes many agricultural policies that lead to an increase in exports of that crop to foreign markets, as these policies that the government takes have a major impact on the producers of that crop, and this study examined the impact of Agricultural policies on the Egyptian cotton crop, using the policy analysis matrix to know the effect of government policies on the producers of that crop and also the impact of those policies on Egyptian exports of the cotton crop, and the results showed that when comparing the financial and economic performance of the elements of cotton crop production, the financial performance was less than the economic performance on all cost items except workers' wages [1], indicating that the Government is subsidizing cost items, thereby supporting cotton producers. Comparing the average variable costs of cotton during the study period financially and economically shows that the financial valuation exceeds the economic valuation, with the average variable costs of $418.36 at market prices [2] , amounting to $368.84 at world prices, The results also showed that the Nominal Protection Coefficient for the output of the Egyptian cotton in the period under study (2000-2017) was 0.74, indicating the lack of a fair production policy during that period, perhaps due to the fact that the value of the Nominal Protection Coefficient  for the production of the Egyptian cotton crop was lower than the correct one. It also indicated that the value of the Nominal Protection Coefficient for production supplies was 0.92, which indicates a decrease in government support for that crop compared to the value of the effective protection factor of 0.72 during the period under study (2000-2017). This indicates that the factor of the cost of domestic resources for the Egyptian cotton crop is 0.47, and this indicates that the Egyptian cotton has a comparative advantage in foreign markets, the study recommended Maintaining the foreign markets of the Egyptian cotton crop, as it has a global comparative and competitive advantage, and provides the state with foreign exchange, which contributes significantly to the Egyptian national economy.

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