Publications

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Volume 1, Issue 3 (September–October 2014)

Effect of Thickness of Tubes on Pressure of Flare

Original Research Article

Journal of Chemistry and Materials Research Vol. 1 (3), 2014, 52–55

M.T. Hannachi *, B. Dahech, H. Guelouche, M. Fareh


Abstract

In this approach, we tried to describe the flare test tubes welded by high frequency induction HF, and its experimental application. The test is carried out ENTTPP (National company of pipe mill and processing of flat products). Usually, the final products (tube) undergo a series of destructive testing (CD) in order to see the efficiency of welding. This test performed on sections of pipe with a length defined in the notice is made under a determined effort (pressure), which depends on its share of other parameters namely mechanical (fracture resistance) and geometry (thickness tube, outside diameter), the variation of this effort is well researched and recorded.

Keywords: flare, destructive testing, pressure, drafts tube, tube finished, Castem 2001.

Received
Received in revised
Accepted
22 August 2014
-
22 August 2014
 

Mobility dependence of the temperature during of the growth

Original Research Article

Journal of Chemistry and Materials Research Vol. 1 (3), 2014, 56–59

Zehor Allam *, Abdelkader Hamdoune, Chahrazed Boudaoud, Aicha Soufi


Abstract

Development of wide-band gap III‒nitride semiconductors has been a subject of intense focus since the 1990s, primarily driven by the quest for blue lasers and high-brightness light-emitting diodes (LEDs). In parallel, III‒nitrides have been studied extensively for use in ultraviolet (UV) photodetectors because they offer intrinsic visible- or solar-blind detection, which would eliminate the need for expensive and efficiency‒limiting optical filters to remove out‒of‒band visible or solar photons. Such detectors would be well suited for numerous applications in the defense, commercial, and scientific arenas, including covert space-to-space communications, early missile-threat detection, chemical and biological threat detection and spectroscopy, flame detection and monitoring, UV environmental monitoring, and UV astronomy. In this paper, we consider an AlGaN/Si photodetector. We use ATLAS developed by International SILVACO‒TCAD for simulating. We simulate the mobility dependence of the temperature and the current dependence of the temperature.

Keywords: Mobility of AlGaN; Atlas Simulation;UV Photodetector.

Received

Received in revised
  Accepted
21 July 2014
18 August 2014
24 August 2014
 

A Comparitive Adsorption Studies on Rice Husk Ash, Activated Rice Husk and Neem Leaves by Using Methylene Blue as Dye

Original Research Article

Journal of Chemistry and Materials Research Vol. 1 (3), 2014, 60–64

Jyoti Rana, Lakshman Singh *


Abstract

The use of cheap and eco­friendly adsorbents are studied as an alternative substitution of activated carbon for removal of dyes from wastewater. Laboratory investigations were done to find the potential of Rice husk ash (RHA), Activated Rice Husk (ARH) and Azadirecta indica leaves (Neem) powder (NLP) to remove methylene blue (MB) dye from aqueous solution. ARH was prepared from rice husk treated with nitric acid and RHA Prepared by heating in muff furnace at 600 °C. Neem  leaves are sundried for few days and then dried  at  low  temperature  (< 105 °C)  for 24 hrs in hot air oven to  remove  moisture  content. The effects of various experimental parameters, such as pH, adsorbent dosage and contact time were investigated. Langmuir adsorption isotherm was applied and R2 value was calculated which shows, Langmuir adsorption is a good fit for the experimental data. The result shows that the 85 % colour removal efficiency can be achieved at the dose of 50 g/l of ARH. 90 % colour removal efficiency is achieved at the adsorbent dose of 40 g/l of RHA. With increase in RHA dose the efficiency increased upto 96 %. 81 % of colour removal efficiency is achieved with NLP.

Keywords: Activated rice husk; Adsorption isotherm; Neem leaves; Methylene blue and Rice husk;


Received
  Received in revised
Accepted

18 July 2014

23 August 2014
25 August 2014
 

Computations of Acoustic Wave Propagation in II-VI Hexagonal Semiconductor Compounds

Original Research Article

Journal of Chemistry and Materials Research Vol. 1 (3), 2014, 65–70

Pramod Kumar Yadawa *


Abstract

The paper presents a comprehensive computation of second- and third- order elastic constants using Lennard-Jones potential and then velocities and attenuation of acoustics waves along unique direction in hexagonal II-VI group semiconducting materials like ZnS, ZnSe, ZnTe and CdTe at room temperature. The comparison of these computed results has been made with available theoretical and experiment results. The orientation dependent acoustic velocity has been also evaluated to study the anisotropic behaviour of these compounds. The inconsistent behaviour of angle-dependent velocities is associated to the action of second order elastic constants. Debye average acoustic velocities of these compounds are increasing with the angle. The value of acoustic attenuation of ZnS is smallest in comparison to other chosen materials. So ZnS is more ductile and more pure than the others. The acoustic attenuation due to phonon-phonon interaction mechanism is predominant over total attenuation as a governing factor thermal conductivity. The mechanical properties of ZnS are better than those of CdTe, because ZnS has high elastic constants, acoustic velocities and low acoustic attenuation. Obtained results, together with other well known physical properties, may expand future prospects for the applications and study of these materials.

Keywords: Elastic constants; Semiconductor compounds; Surface waves; Ultrasonic properties.

Received 

Received
   Received in revised
   Accepted

08 August 2014

 -
28 August 2014
 

Durability Conveyor Belt in Pelletizer Unit‒Operation

Original Research Article

Journal of Chemistry and Materials Research Vol. 1 (3), 2014, 71–78

Sanjay Pandey, Omprakash Sahu *, Raja Thiyagarajam


Abstract

The 21st century factory will often have several conveyor belts operating at the same time. Without the conveyor belt, the factory system would not be able to handle the production demands made upon them, and industry would not be able to transport their materials from the area of manufacture to the delivery vans. In the past, older belts needed to have a leather or rubbery surface which often wore down quickly, and needed to be turned at a slow speed to prevent breaks and sudden failures of these conveyors. Many of them required manual assistance to turn, so they needed a constant source of labor. However, designers realized the importance of these belts, and started to come up with ways to improve the system. Now industry metal conveyors are used but due to bearing, tearing, corrosion problem facing by industry. By alloying on the surface of metal conveyor it can be prevent all most. The main objective of the work is to brief idea about the two metals i.e. iridium and tantalum several comparative results are attached to understand the corrosive resistance nature of these two metals.

Keywords: Acidic; Bearing; Corrosion; Damage; Tearing.

Received
   Received in revised
   Accepted

01 August 2014

01 September 2014
  04 September 2014
 

Applications of Biogas: State of the Art and Future Prospective

Review Article

Journal of Chemistry and Materials Research Vol. 1 (3), 2014, 79–107

Abdeen Mustafa Omer *


Abstract

Sudan is an agricultural country with fertile land, plenty of water resources, livestock, forestry resources, and agricultural residues. Energy sources are divided into two main types; conventional energy (woody biomass, petroleum products, and electricity); and non-conventional energy (solar, wind, hydro, etc.). Sudan possesses a relatively high abundance of sunshine, solar radiation, moderate wind speeds, hydro, and biomass energy resources. Like many tropical countries, Sudan has ample biomass resources that can be efficiently exploited in a manner that is both profitable and sustainable. Fuel-wood farming offers cost-effective and environmentally friendly energy solutions for Sudan, with the added benefit of providing sustainable livelihoods in rural areas. Biogas from biomass appears to have potential as an alternative energy in Sudan, which is potentially rich in biomass resources. This is an overview of some salient points and perspectives of biomass technology in Sudan. This current literature is reviewed regarding the ecological, social, cultural and economic impacts of biomass technology. This article provides an overview of biomass energy activities and highlights future plans concerning optimum technical and economical utilisation of biomass energy available in Sudan. It is concluded that renewable environmentally friendly energy must be encouraged, promoted, implemented, and demonstrated by full-scale plan especially for use in remote rural areas.

Keywords: Sudan; energy; consumption patterns; renewable energy potential; Biomass; Biogas; sustainable development; impacts on environment; mitigations.


Received
    Received in revised
   Accepted 
 24 August 2014
  -
   07 September 2014