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    • Several versions

    4-Lump kinetic model for vacuum gas oil hydrocracker involving hydrogen consumption

    Sadighi, Sepehr, Ahmad, Arshad, Rashidzadeh, Mehdi
    Korean Journal of Chemical Engineering, 2010, Vol.27(4), pp.1099-1108 [Peer Reviewed Journal]

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    Primary amyloidoma of chest wall--a rare condition

    Kumar, Suresh, Kumar, Surender, Ahmad, Arshad, Kumar, Awanish
    BMJ case reports, 27 March 2012, Vol.2012 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: Primary amyloidoma of chest wall--a rare condition
    Author: Kumar, Suresh; Kumar, Surender; Ahmad, Arshad; Kumar, Awanish
    Subject: Thoracic Wall ; Amyloidosis -- Diagnosis
    Description: Organ specific amyloidosis has been shown to be confined to various organs like liver, lung, spleen, urinary bladder and gastro-intestinal tract, but amyloidoma or tumoural amyloidosis of chest wall with no evidence of systemic amyloidosis is an extremely rare presentation and only two cases have been reported till now. The authors report a case of chest wall amyloidoma with review of literature.
    Is part of: BMJ case reports, 27 March 2012, Vol.2012
    Identifier: 1757-790X (E-ISSN); 22605798 Version (PMID); 10.1136/bcr.01.2012.5552 (DOI)

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    Effect of Lump Partitioning on the Accuracy of a Commercial Vacuum Gas Oil Hydrocracking Model

    Sadighi, Sepehr, Ahmad, Arshad, Masoudian, Seyed Kamal
    International Journal of Chemical Reactor Engineering, 2012, Vol.10(1) [Peer Reviewed Journal]
    Walter de Gruyter GmbH
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    Title: Effect of Lump Partitioning on the Accuracy of a Commercial Vacuum Gas Oil Hydrocracking Model
    Author: Sadighi, Sepehr; Ahmad, Arshad; Masoudian, Seyed Kamal
    Publisher: De Gruyter
    Subject: Hydrocracking ; Lump Kinetic Model ; Vacuum Gas Oil ; Partitioning ; Separation
    Description: In an industrial hydrocracking plant, except to the reactor, the separation section can affect the accuracy of the developed mathematical model. In this study, two combined-bed six and seven-lump kinetic models for the hydrocracking of vacuum gas oil in a real refinery are developed and their accuracies for the prediction of product yields are compared. In the six-lump model, the engaged components are selected according to the actual products of the plant, but the seven-lump one is included of lumps which are partitioned based on the specified initial and final boiling points.For both approaches, a complete kinetic network with the catalyst-decay functions is considered. It is found that over a 17-month period of operation from the start of run, the average absolute deviation (AAD%) of the six-lump and the seven-lump models for the yield prediction are 20.51% and 5.21%, respectively for all products. Additionally, the sum of residuals for the seven-lump model has been appreciably decreased in comparison to the six-lump one. Therefore, it is confirmed that partitioning of the products to the lumps with specific boiling points can acceptably decrease the deviation of the prediction. So it is conclusive that including the operation of the separation section in commercial models can effectively increase the accuracy of the model and smooth the prediction error.
    Is part of: International Journal of Chemical Reactor Engineering, 2012, Vol.10(1)
    Identifier: 1542-6580 (E-ISSN); 10.1515/1542-6580.2616 (DOI)

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    Evisceration of the small bowel through a perforated and prolapsed sigmoid colon: an unusual presentation of rectal prolapse

    Ahmad, Arshad, Kumar, Suresh, Sonkar, Abhinav Arun, Kumar, Sanjeev
    BMJ case reports, 15 April 2016, Vol.2016, pp.10.1136/bcr-2016-214811 [Peer Reviewed Journal]
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    Title: Evisceration of the small bowel through a perforated and prolapsed sigmoid colon: an unusual presentation of rectal prolapse
    Author: Ahmad, Arshad; Kumar, Suresh; Sonkar, Abhinav Arun; Kumar, Sanjeev
    Subject: Colon, Sigmoid ; Intestine, Small ; Intestinal Perforation -- Complications ; Rectal Prolapse -- Complications ; Sigmoid Diseases -- Complications
    Description: Spontaneous prolapse of the sigmoid colon and evisceration of the small bowel through a rupture in the rectosigmoid is a rare presentation. We report a case of a 60-year-old man presenting with massive small bowel evisceration through a perforation in a prolapsed sigmoid colon. The patient had a 2-year history of rectal prolapse. He was also incontinent for flatus and liquid stool. There was no other significant medical history. After reduction of the small intestine, a large perforation was seen in the prolapsed sigmoid colon. The sigmoid colon was identified by presence of appendices epiploicae and taeniae coli. After initial resuscitation, an emergency laparotomy was performed. The perforated sigmoid colon was resected and a Hartmann's colostomy was created. This resulted in complete recovery. Reversal of the Hartmann's colostomy was performed after 6 weeks.
    Is part of: BMJ case reports, 15 April 2016, Vol.2016, pp.10.1136/bcr-2016-214811
    Identifier: 1757-790X (E-ISSN); 27084900 Version (PMID); 10.1136/bcr-2016-214811 (DOI)

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    Comparative Analysis of Doppler Guided Hemorrhoidal Artery Ligation (DG-HAL) & Infrared Coagulation (IRC) in Management of Hemorrhoids

    Ahmad, Arshad, Kant, Rama, Gupta, Avneet
    Indian Journal of Surgery, 2013, Vol.75(4), pp.274-277 [Peer Reviewed Journal]

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    Thermogravimetric and Kinetic Analyses of Oil Palm Empty Fruit Bunch (OPEFB) Pellets Using the Distributed Activation Energy Model

    Nyakuma, Bemgba, Ahmad, Arshad, Johari, Anwar, Abdullah, Tuan
    Journal of Physical Science, 2016, Vol.27(3), pp.67-83 [Peer Reviewed Journal]
    © ProQuest LLC All rights reserved, Engineered Materials Abstracts, Solid State and Superconductivity Abstracts, METADEX, Materials Science Database, Advanced Technologies & Aerospace Database, Engineering Database, East & South Asia Database, Publicly Available Content Database, Advanced Technologies Database with Aerospace, Materials Research Database, Technology Research Database, ProQuest Engineering Collection, ProQuest Advanced Technologies & Aerospace Collection, ProQuest Materials Science Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest Central China, ProQuest One Academic, Advanced Technologies & Aerospace Index (ProQuest), Materials Science Index (ProQuest), Materials Science Collection (ProQuest), Engineering Collection (ProQuest)
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    Title: Thermogravimetric and Kinetic Analyses of Oil Palm Empty Fruit Bunch (OPEFB) Pellets Using the Distributed Activation Energy Model
    Author: Nyakuma, Bemgba; Ahmad, Arshad; Johari, Anwar; Abdullah, Tuan
    Subject: Pyrolysis ; Reaction Kinetics ; Fruits ; Activation Energy ; Thermal Degradation ; Palm ; Decomposition ; Pellets ; Miscellaneous Sciences (So) ; General and Nonclassified (MD) ; General and Nonclassified (Ep) ; General and Nonclassified (Ed) ; General and Nonclassified (EC) ; Thermogravimetry ; Oil Palm ; Empty Fruit Bunches ; Pellets ; Energy Model;
    Description: The thermal degradation behaviour and decomposition kinetics of oil palm empty fruit bunch (OPEFB) pellets were investigated using a thermogravimetric analyser and the distributed activation energy model (DAEM). The OPEFB pellets were heated from 30°C to 1000°C at three different heating rates (5, 10, 20°C min^sup -1^) under a nitrogen atmosphere. The thermogravimetric-derivative thermogravimetric (TG-DTG) curves revealed that the non-isothermal decomposition of OPEFB pellets occurred in the following three stages: drying (35°C-175°C), active pyrolysis (200°C-370°C) and passive pyrolysis (370°C-1000°C), which resulted in the loss of moisture, volatile matter and char, respectively. The distributed activation energy model was subsequently used to determine the apparent activation energies (E) and pre-exponential factors (A), which ranged from 37.89 kJ mol^sup -1^ to 234.05 kJ mol^sup -1^ and from 2.05 × 10^sup 2^ min^sup -1^ to 3.54 × 10^sup 18^ min^sup -1^, respectively, for conversions...
    Is part of: Journal of Physical Science, 2016, Vol.27(3), pp.67-83
    Identifier: 16753402 (ISSN); 21804230 (E-ISSN); 10.21315/jps2016.27.3.5 (DOI)

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    Kinetic behaviour of graft copolymerisation of nitrogenous heterocyclic monomer onto EB-irradiated ETFE films

    Sithambaranathan, Paveswari, Nasef, Mohamed, Ahmad, Arshad
    Journal of Radioanalytical and Nuclear Chemistry, 2015, Vol.304(3), pp.1225-1234 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Kinetic behaviour of graft copolymerisation of nitrogenous heterocyclic monomer onto EB-irradiated ETFE films
    Author: Sithambaranathan, Paveswari; Nasef, Mohamed; Ahmad, Arshad
    Subject: Kinetic investigation ; Radiation induced graft copolymerisation ; 4-Vinyl pyridine ; ETFE film
    Description: Kinetic behaviour of graft copolymerisation of a nitrogenous heterocyclic monomer, 4-vinylpyridine (4-VP), onto electron beam irradiated poly(ethylene-co-tetrafluoroethylene) (ETFE) films was investigated in correlation with reaction parameters (absorbed dose, monomer concentration and reaction temperature). This was established by determination of initial polymerisation rate ( r p0 ), characteristic radical recombination rate (γ) and delay time ( t 0 ). The orders of the dependence of the initial rate of grafting on the absorbed dose and monomer concentration were found to be 2.28 and 3.49, respectively. The effect of temperature was investigated in the range of 50–70 °C and the activation energy was determined. The incorporation of poly(4-VP) grafts and the accompanied chemical changes in the grafted ETFE films were monitored using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, respectively. The results of the present study showed that a quantitative kinetic description for grafting of 4-VP onto ETFE can be established and the degree of grafting can be tuned by controlling the reaction parameters.
    Is part of: Journal of Radioanalytical and Nuclear Chemistry, 2015, Vol.304(3), pp.1225-1234
    Identifier: 0236-5731 (ISSN); 1588-2780 (E-ISSN); 10.1007/s10967-015-3927-6 (DOI)

    • Several versions

    Vapor-liquid equilibrium of ethanol/ethyl acetate mixture in ultrasonic intensified environment

    Mahdi, Taha, Ahmad, Arshad, Ripin, Adnan, Nasef, Mohamed
    Korean Journal of Chemical Engineering, 2014, Vol.31(5), pp.875-880 [Peer Reviewed Journal]

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    Environmentally benign and highly regioselective ring opening of epoxides accelerated by ultrasound irradiation

    Nasef, Mohamed Mahmoud, Zakeri, Masoumeh, Asadi, Jahanbakhsh, Abouzari-Lotf, Ebrahim, Ahmad, Arshad, Malakooti, Reihaneh
    Green chemistry letters and reviews, 02 January 2016, Vol.9(1), pp.76-84 [Peer Reviewed Journal]

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    Thermogravimetric Analysis of Char Waste from the Air Gasification of Empty Fruit Bunch Briquette

    Nyakuma Bemgba Bevan, Mazangi Mojtaba, Johari Anwar, Ahmad Arshad, Tuan Abdullah Tuan Amran
    MATEC web of conferences, 01 July 2014, Vol.13, p.02004 [Peer Reviewed Journal]
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    Title: Thermogravimetric Analysis of Char Waste from the Air Gasification of Empty Fruit Bunch Briquette
    Author: Nyakuma Bemgba Bevan; Mazangi Mojtaba; Johari Anwar; Ahmad Arshad; Tuan Abdullah Tuan Amran
    Subject: Engineering
    Description: The thermal decomposition behavior of char waste produced from the air gasification of Empty Fruit Bunch (EFB) briquette was examined using thermogravimetric analysis (TGA). A comparison between the thermal decomposition behavior of char waste and EFB briquette is also presented. The results indicate that the char waste produced decreased from 22 % to 18 % with increasing temperature from 600 °C to 700 °C during gasification. This is due to the effect of high temperatures on the primary char decomposition reactions. It was observed that char degradation occurs in two steps; char degradation I & II with weight losses of 17 % and 32 % respectively. This showed that only ~ 50 % char was decomposed during thermal analysis, hence higher temperatures are required to ensure complete decomposition. The TGA curve for EFB briquette showed that complete thermal decomposition of EFB briquette occurs in four stages namely; drying, devolatization, reduction and char degradation. The most...
    Is part of: MATEC web of conferences, 01 July 2014, Vol.13, p.02004
    Identifier: 2261-236X (E-ISSN); 10.1051/matecconf/20141302004 (DOI)