Performance of Dual-Media Down-Flow Rapid Gravity Filters

Majid I. Abdul-Wahab; Nada N. AI-Ghanim; Baseem H. Essebbag

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Publication Date

Fri Mar 30 2007

Journal Name

Iraqi Journal Of Chemical And Petroleum Engineering

Volume

8

Issue Number

1

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Performance of Dual-Media Down-Flow Rapid Gravity Filters

water treatment

turbidity

headloss

filtration

dual media

Majid I. Abdul-Wahab

Nada N. AI-Ghanim

Baseem H. Essebbag

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The present study was conducted to evaluate the effect of variation of influent raw water turbidity, bed composition, and filtration rate on the performance of mono (sand) and dual media (sand and anthracite) rapid gravity filters in response to the effluent filtered water turbidity and headloss development. In order to evaluate each filter pe1formance, sieve analysis was made to characterize both media and to determine the effective size and uniformity coefficient. Effluent filtered water turbidity and the headloss development was recorded with time during each experiment.

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Publication Date

Tue Oct 01 2013

Journal Name

Journal Of Economics And Administrative Sciences

Developing the high performance practices to attain Organizational effectiveness

الموارد البشرية- ومنظومة عمل الأداء العالي - وممارسات منظومة عمل الأداء العالي- والتوظيف الفعال- والتدريب المعمق- وتهيئة فرص المسار الوظيفي- ومشاركة العاملين- ومبدأ تقاسم المعلومات- ومبدأ تطوير المعرفة- ومبدأ ربط العائد بالأداء - ومبدأ المساواة

Human Resource Management- High Performance Work System- high performance work system practices- Effective staffing- comprehensive training- providing work career- employee participation -Shared Information- Knowledge Development - Performance – Reward linkage- Egalitarianism

سعد علي

سمر عادل

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Abstract

This current research aims to make theoretical frame for the thoughts and principle knowledge for high performance work system ،also trying to know the role that high performance work system practices which is (Effective staffing، comprehensive training، providing work career، and employee participation) play to enhance the organization effectiveness ، although knowing the principles of high performance work system which is: (Shared Information، Knowledge Development Performance and Reward linkage Egalitarianism)and its effect on the organizations. As well as defining the special concept of High performance wo

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Publication Date

Mon Jul 28 2025

Journal Name

Applied Physics Letters

Theoretical defect engineering in AgBiI4 for enhanced photovoltaic performance

Quanhe

Haoze

Zhongyi

Haoyu

Rasha A.

Run

Weiwei

Fei

Feng

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Silver-bismuth iodide (ABI) ternary semiconductors, such as AgBi2I7, AgBiI4, Ag2BiI5, and Ag3BiI6, have emerged as promising lead-free light absorbers for photovoltaic applications due to their favorable optoelectronic properties. Despite recent advances that have improved power conversion efficiencies from ∼1% to over 5%, ABI-based solar cells still show substantial open-circuit voltage (VOC) losses of up to ∼1 V, which significantly hinder the device performance. These losses have been experimentally attributed to the non-radiative recombination originating from intrinsic defects, however, theoretical understanding of these defect mechanisms remains limited. Here, using density functional theory calculations, we systematical

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Publication Date

Mon Mar 08 2021

Journal Name

Baghdad Science Journal

Fast neutrons Al-Hamdani utilization to solar cells performance

Ali-H.

Nidalla H.K.

Saad Adbulwahed

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Been in this gravel study the effect of Alchgag fast neutrons emitted by the source on the electrical properties of silicon solar cells monounsaturated crystal at a constant rate of neutron flow rate of a wide range of neutron flow speed ranges for periods of time ranging from 2-10 hours

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Publication Date

Sat Oct 01 2016

Journal Name

Journal Of Theoretical And Applied Information Technology

Factors affecting global virtual teams’ performance in software projects

Today the trend is to perform software development work via distributed geographical area among team

individual or even as an organization. However

due to the global market and international presence of many companies

there is a need to implement a global virtual teams. The global virtual team members are gradually engaged in globalized business environments across space

time and organizational boundaries via information and communication technologies. A global virtual team relies on communication

collaboration

and information exchange are the most important criteria in global virtual teams’ operations. The purpose of this paper is to answer two research questions. The first research question is to identify the factors affecting global virtual teams’ performance. A systematic literature review was conducted to answer the first research question. The second research question is on what the rank of the factor affecting the global virtual teams’ performance according to their level of effect on global virtual teams’ performance. Online survey was conducted within 103 developers and IT managers from eight IT companies to answer the second research question. The Statistical Package for Social Science (SPSS 22) was used to analyze the collected data. In this study

we investigated factors that affect global virtual teams’ performance

factors considered include cultural differences

language problems

time-zone differences

team size

technical problems

lack of trust

lack of sufficient training

and ICT problems. Also the findings indicated that lack of sufficient training is the highest level of effect on global virtual teams’ performance. On the other hand

Ali Yahya Gheni

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(24)

Publication Date

Tue Dec 20 2022

Journal Name

2022 International Conference On Computer And Applications (icca)

Improve Data Mining Techniques with a High-Performance Cluster

Fadhil H.M.

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Publication Date

Tue Aug 02 2022

Journal Name

Karbala International Journal Of Modern Science

Performance Simulation for Adaptive Optics Technique Using OOMAO Toolbox

Adaptive Optics (AO)

OOMAO

Strehl R atio (SR)

Full Turbulence

Residue Turbulence

Noise.

Mahmood

Raaid

Bushra

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The Adaptive Optics technique has been developed to obtain the correction of atmospheric seeing. The purpose of this study is to use the MATLAB program to investigate the performance of an AO system with the most recent AO simulation tools, Objected-Oriented Matlab Adaptive Optics (OOMAO). This was achieved by studying the variables that impact image quality correction, such as observation wavelength bands, atmospheric parameters, telescope parameters, deformable mirror parameters, wavefront sensor parameters, and noise parameters. The results presented a detailed analysis of the factors that influence the image correction process as well as the impact of the AO components on that process

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(6)

(1)

Publication Date

Sun Dec 01 2019

Journal Name

Academy Of Accounting And Financial Studies Journal

Organizational performance in Iraqi SMEs: Validity and reliability questionnaire

Mohammed

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(14)

Publication Date

Thu Mar 18 2021

Journal Name

Egyptian Journal Of Chemistry

Investigation of the Influence of Membrane Type on the Performance of Microbial Fuel Cell

Hayder

Ahmed

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(3)

(1)

Publication Date

Tue Dec 30 2008

Journal Name

Iraqi Journal Of Chemical And Petroleum Engineering

The Effect of TCE Addition on the Performance of Catalytic Isomerization of n-Hexane

Abdul Halim

Maha

Samar

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n-Hexane conversion enhancement was studied by adding TCE (Trichloro-ethylene) on feed stream using 0.3%Pt/HY zeolite catalyst. All experiments were achieved at atmospheric pressure and on a continuous laboratory unit with a fixed bed reactor at a temperature range 240-270◦C, LHSV 1-3h-1, H2/nC6 mole ratio 1-4.
By adding 435 ppm of TCE, 49.5 mole% conversion was achieved at LHSV 1h-1, temperature of 270ºC and H2/nC6 mole ratio of 4, while the conversion was 18.3 mol% on the same catalyst without adding TCE at the same conditions. The activation energy decreased from 98.18 for pure Pt/HY zeolite to 82.83 kJ/mole by adding TCE. Beside enhancement the activity, selectivity and product distribution enhanced by providing DMB (Dimethyl b

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Publication Date

Fri Jan 01 2021

Journal Name

Annals Of Tropical Medicine & Public Health

Newly developed method for determination of methyldopa drug using ammonium ceric (IV) nitrate by continuous flow injection analysis via homemade NAG-ADF-300-2 analyser

Continuous flow injection analysis

Methyldopa

Photometer

turbidmetric

Elham N.

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A new, simple, sensitive and fast developed method was used for the determination of methyldopa in pure and pharmaceutical formulations by using continuous flow injection analysis. This method is based on formation a burgundy color complex between methyldopa andammonium ceric (IV) nitrate in aqueous medium using long distance chasing photometer NAG-ADF-300-2. The linear range for calibration graph was 0.05-8.3 mmol/L for cell A and 0.1-8.5 mmol/L for cell B, and LOD 952.8000 ng /200 µL for cell A and 3.3348 µg /200 µL for cell B respectively with correlation coefficient (r) 0.9994 for cell A and 0.9991 for cell B, RSD % was lower than 1 % for n=8. The results were compared with classical method UV-Spectrophotometric at λ max=280 n

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