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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Iranian Journal of Otorhinolaryngology
- نوع مقاله: Journal Article
- کلمات کلیدی: tympanoplasty,Partial perforation,Total perforation
- چکیده:
- چکیده انگلیسی: Introduction:
To describe the underlay tympanoplasty technique using an acellular dermal graft(AlloDerm) for tympanic membrane (TM) reconstruction in a guinea pig model and to demonstrate the feasibility of the technique using AlloDerm tissue harvested from the prepuce as a source of tissue for future grafting in human TM reconstruction.
Materials and Methods:
The prepuce was divided during circumcision and the acellular dermis was prepared using a number of standard processes. Two groups of guinea pigs were prepared. In the case group (20 guinea pigs and 40 ears) removal of TM was performed with tympanoplasty using AlloDerm, and in the control group (eight guinea pigs and 16 ears), removal of TM was performed without tympanoplasty. In each group, the TM was completely removed in one ear and partially removed on the other side, and the integrity of the TMs was re-evaluated after 8 weeks.
Results:
In the case group, the healing rates in the completely and partially removed TMs were 83.3% and 94.4%, respectively. The difference in healing rate (0% and 66.7%, respectively) was statistically significant (P<0.05).
Conclusion:
The use of AlloDerm is safe and effective in the repair of TM perforations in a guinea pig model. Acceptable results of AlloDerm tympanoplasty in a guinea pig model may pave the way for the effective use of this material in human TM reconstructions.- انتشار مقاله: 10-02-1393
- نویسندگان: Farhad Farahani,Alireza Karimi Yazdi,Mohammad Ghasemi,Elnaz Shariatpanahi,Abdol-Mohammad Kajbafzadeh,Saeid Amanpour
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Oil and Gas Science and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Knudsen Number,Net Pay Zone,Porosity and Permeability Cutoff,Tight Gas Reservoirs
- چکیده:
- چکیده انگلیسی: Net pay thickness is defined as that portion of a reservoir which contains economically producible hydrocarbons with today’s technology, prices, and costs. This thickness is a key parameter of the volumetric calculation of in-place hydrocarbons, well test interpretation, and reservoir characterization. A reservoir interval is considered as net pay when it contains hydrocarbons that can flow at an economic rate. Therefore, to define net pay, cutoffs of hydrocarbon storage properties besides flow properties of reservoir rock are necessary. Frequently, petrophysical log-derived rock storage properties like porosity and water saturation are linked to core measured properties like permeability to find a relation between them. Then, by use of a fixed limiting value for permeability, log-derived properties cutoffs are determined. The basic problem of these methods is related to permeability cutoff, since in most cases there is no knowledge about it, and the permeability cutoff can differ from field to field or even well to well.
A new methodology has been developed to find a logical permeability cutoff for gas reservoirs which can differ for different wells and/or fields. This technique is based on gas flow through porous media in tight rocks. Accordingly, a relationship between porosity and permeability is derived as a cutoff value at reservoir pressure and temperature, which is considered as a discriminator plot. Then, the core data of the specified reservoir are added to this plot and the data points reflecting net pay zone are identified. This technique has been applied to four real gas reservoirs in Iran and indicated acceptable results confirmed by the drill stem test (DST) and production data. The results show that the proposed procedure is less dependent on experts’ experiences and acts as a straightforward and powerful tool for the refinement of net pays. In addition, the cutoff values calculated from this method contain a scientific base supporting the main procedure.- انتشار مقاله: 10-05-1398
- نویسندگان: Mehdi Qassamipour,Elnaz Khodapanah,Seyyed Alireza Tabatabaei-Nezhad
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Oil and Gas Science and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Sour Gas Flares,EPA Environmental Reports,Pollutant Emission,FRNC Software
- چکیده:
- چکیده انگلیسی: In sour gas flares, content like any other components in inlet gas influences adiabatic flame temperature, which, in turn, impacts on the pollutant emission. Wherever flame temperature increases, the endothermic reaction between and is accelerated, which means higher emission to the atmosphere. In this work, we developed an in-house MATLAB code to provide an environment for combustion calculations. Then, this written code was used to perform sensitivity analyses on content, air temperature, and excess air ratio in sour gas flares. We used Environmental Protection Agency (EPA) reports to assign weighting indexes to each air contaminant according to its harmfulness to environment; thereafter, sour gas flaring conditions were optimized for two real field case studies, namely Ahwaz (AMAK) and South Pars, to reach the minimum integrated pollutant concentrations. The results show that each 2% increase in the content of the entrance feed may produce 0.3% additional in the exhaust. The results also confirm that decreases of 20 °F and 50 °F in the oxidant temperature cause emission to reduce by 0.5% to 1% respectively. Finally, to verify and validate our results acquired from the written MATLAB code, FRNC 2012 industrial software was used to duplicate the oxidation results for the two sour flare case studies.
- انتشار مقاله: 01-02-1397
- نویسندگان: Ahmed Zoeir,Alireza Tabatabaei Nejad,Elnaz Khodapanah
- مشاهده
- جایگاه : پژوهشی
- مجله: Immunology and Genetics Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Common variable immunodeficiency,Gastrointestinal manifestation,Enteropathy phenotype,Diagnostic delay
- چکیده:
- چکیده انگلیسی: Enteropathy is one of the rare manifestations of common variable immunodeficiency (CVID) as a predominant antibody deficiency. Proper diagnosis of this phenotype in CVID cases is difficult and may result in inaccurate assessment or incorrect management. Further, this misdiagnosis is more probable when noninfectious diarrhea is the only manifestation of CVID. We present herein a case with such an abstruse condition who was misdiagnosed as a celiac disease leading to delayed diagnosis of her primary immunodeficiency disease. We also offer a review on enteropathy manifestation in CVID patients.
- انتشار مقاله: 14-10-1397
- نویسندگان: Nasser Ebrahimi Daryani,Babak Torabi-Sagvand,Elnaz Panah
- مشاهده