Pyrolysis of different date palm industrial wastes into high-quality bio-oils: A comparative study

ABSTRACTA comparative study of two different MOVPE reactors used for GaN growth is presented. Computational fluid dynamics (CFD) was used to determine common gas phase and fluid flow behaviors within these reactors. This paper focuses on the common thermal fluid features of these two MOVPE reactors with different geometries and operating pressures that can grow device-quality GaN-based materials. Our study clearly shows that several growth conditions must be achieved in order to grow high quality GaN materials. The high-temperature gas flow zone must be limited to a very thin flow sheet above the susceptor, while the bulk gas phase temperature must be very low to prevent extensive pre-deposition reactions. These conditions lead to higher growth rates and improved material quality. A certain range of gas flow velocity inside the high-temperature gas flow zone is also required in order to minimize the residence time and improve the growth uniformity. These conditions can be achieved by the use of either a novel reactor structure such as a two-flow approach or by specific flow conditions. The quantitative ranges of flow velocities, gas phase temperature, and residence time required in these reactors to achieve high quality material and uniform growth are given.

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High quality oil recovery from oil-based drill cuttings via catalytic upgrading in presence of near-/supercritical water and different industrial wastes

Journal of Cleaner Production ◽

10.1016/j.jclepro.2021.129061 ◽

2021 ◽

Vol 321 ◽

pp. 129061

Author(s):

Zhong Chen ◽

Kun Tong ◽

Chunlan He ◽

Ming Xue ◽

Chong Lyu ◽

...

Keyword(s):

Supercritical Water ◽

Oil Recovery ◽

Industrial Wastes ◽

High Quality ◽

Drill Cuttings ◽

Catalytic Upgrading

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A COMPARATIVE STUDY ON THE KINDS OF WEEDS OF PALM Plantations IN Tabuk AND Al-Qassim Regions IN Saudi Arabia

IRAQI JOURNAL OF AGRICULTURAL SCIENCES ◽

10.36103/ijas.v52i3.1368 ◽

2021 ◽

Vol 52 (3) ◽

pp. 763-773

Author(s):

N. A. Al-Harbi

Keyword(s):

Saudi Arabia ◽

Comparative Study ◽

Data Management ◽

Life Span ◽

Life Form ◽

Date Palm ◽

Arabian Peninsula ◽

Severe Damage ◽

Common Life ◽

Unique Species

This study was aimed to investigate weeds kind in palm plantations. Date palm is the most chief economic crop in most countries of the Arabian Peninsula. Many factors, such as the presence of weeds, may cause a huge loss in the production of dates. Despite the severe damage caused by the presence of some weeds in agroecosystems, many weeds have many medicinal and economic uses. A total of 62 species were listed in palm Plantations in Tabuk and Al-Qassim Regions. A total of 51 species were listed in Tabuk Region (The number of unique species in the Tabuk Region reached 32 that not recorded in Al-Qassim Region. Also, 19 species were recorded in both of Tabuk and Al-Qassim Regions). A total of 30 weeds were listed in Al-Qassim Region (The number of unique species in the Al-Qassim Region reached 11 that not recorded in the Tabuk Region. In addition to, 19 species were recorded in both of Tabuk and Al-Qassim Regions). Zygophyllaceae was the most common family, the majority life span was annuals and the most common life form was therophyte in both Tabuk and Al-Qassim Regions. Data management and classification were achieved using PCORD (TWINSPAN and DCA analyses).

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A Conceptual Descriptive-Comparative Study of Models and Standards of Processes in SE, SwE, and IT Disciplines Using the Theory of Systems

Emerging Systems Approaches in Information Technologies ◽

10.4018/978-1-60566-976-2.ch010 ◽

2010 ◽

pp. 156-181 ◽

Cited By ~ 2

Author(s):

Manuel Mora ◽

Ovsei Gelman ◽

Rory O’Connor ◽

Francisco Alvarez ◽

Jorge Macías-Lúevano

Keyword(s):

Comparative Study ◽

Business Process ◽

Business Organization ◽

High Quality ◽

Quality Cost ◽

Process Understanding ◽

Systemic Model ◽

Cost Efficient ◽

Organizational Selection ◽

Task Understanding

The increasing design, manufacturing, and provision complexity of high-quality, cost-efficient and trustworthy products and services has demanded the exchange of best organizational practices in worldwide organizations. While that such a realization has been available to organizations via models and standards of processes, the myriad of them and their heavy conceptual density has obscured their comprehension and practitioners are confused in their correct organizational selection, evaluation, and deployment tasks. Thus, with the ultimate aim to improve the task understanding of such schemes by reducing its business process understanding complexity, in this article we use a conceptual systemic model of a generic business organization derived from the theory of systems to describe and compare two main models (CMMI/SE/SwE, 2002; ITIL V.3, 2007) and four main standards (ISO/IEC 15288, 2002; ISO/IEC 12207, 1995; ISO/IEC 15504, 2005; ISO/IEC 20000, 2006) of processes. Description and comparison are realized through a mapping of them onto the systemic model.

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