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Search Results: 1 - 10 of 203 matches for " Darioush Irani "
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Results of Modified Gil-Vernet Antireflux Surgery in the Treatment of Vesicoureteral Reflux
Darioush Irani,M Heidari
Urology Journal , 2004,
Abstract: Purpose: To evaluate the efficacy of modified Gil-Vernet anti-reflux surgery in the treatment of patients with primary vesicoureteral reflux in a prospective historical controlled trial. Materials and Methods: A total of 30 patients with 46 refluxing units underwent this surgery since February 1998 until September 2002, with the mean follow-up period of 18 (range 6 to 43) months. Results: Vesicoureteral reflux was resolved completely in 44 ureteral units (95.6%, P < 0001). In 2 refluxing units (4.3%) in spite of reflux improvement, hydroureter remained unchanged after the surgery. In respect to response rate, there was no significant difference between different grades, genders, age groups, and laterality of primary vesicoureteral reflux. Conclusion: Our findings indicate that modified Gil-Vernet anti-reflux surgery which separately transfers each ureteral orifice to the tip of trigone with two fine absorbable suture on each side, is a completely successful procedure in the treatment of primary vesicoureteral reflux and produces a longer submucosal tunnel with a more suitable angel than classic Gil-Vernet procedure dose.
Results of Dermal Patch Graft in the Treatment of Peyronie’s Disease
Darioush Irani,Shahriyar Zeighami,A A Khezri
Urology Journal , 2004,
Abstract: Purpose: To investigate the efficacy of “dermal patch graft” in surgical management of Peyronie’s. Materials and Methods: eighteen of Peyronie’s disease cases, with a mean age of 49 and a history of penile curvature and painful erection were enrolled in this study. Diagnosis was made clinically by plaque palpation. All of them were in the chronic stage of disease with symptom duration of at least 6 months. We also evaluate their potency through Brief Sexual Function Inventory (BSFI) questionnaire before and after the operation, meanwhile the degree of penile curvature was measured with goniometry while artificial erection status was induced. Results: Mean penile curvature, before and after the operation (58 and 5 degrees respectively), showed significant improvement (P < 0.001). The improvement of curvature was irrespective of the plaque size. All of our patients suffered from inability to intercourse due to significant penile curvature but after the procedure 11 of them (66.1%) could do so. Also the BSFI score improved significantly in this subgroup (P < 0.05). The remaining 7 cases (39%) already suffered from erectile dysfunction despite of operation; however, the penile curvature improved significantly in them. Six of this latter group had a plaque size greater than 4 cm2 and BSFI score was not significantly improved.Conclusion: Dermal patch graft as a cost effective method in the management of Peyronie’s disease significantly corrects the curvature irrespective of plaque size and curvature severity. We found that if the fibrous plaque is less than 4 cm2 and the patient has no severe erectile dysfunction, this procedure will significantly improve his potency; however, if the patient suffers from a plaque sized greater than 4 cm2 and/or severe erectile dysfunction, to reach satisfactory erection, implantation of penile prosthesis or applying other methods of artificial erection in addition to dermal patch graft is suggested.
The efficacy and Safety of Intravesical Bacillus-Calmette-Guerin in the Treatment of Female Patients with Interstitial Cystitis: A double-blinded Prospective Placebo Controlled Study
Darioush Irani,M Heidari,AA Khezri
Urology Journal , 2004,
Abstract: Purpose: To evaluate the efficacy and safety of intravesical Bacillus Calmette-Gurein injection in the treatment of female patients with interstitial cystitis. Materials and Methods: Thirty women meeting the National Institute of Arthritis, Diabetes, digestive and kidney diseases criteria for interstitial cystitis, were randomized in a double-blinded fashion in two groups each consisted of 15 patients to receive six, weekly instillation of 120 mg BCG vaccine of Iranian Institute of pastor or placebo. Periodic questionnaires on symptoms of interstitial cystitis, voiding diaries, bladder capacity at first desire to void, and maximum bladder capacity were obtained. Adverse events were closely monitored during the treatment and follow-up phases of the study. Subjective and objective baseline values were compared with the follow-up data. Results: With a mean follow-up of 24 (range 6 to 33) months 11 out of 15 (73%) in BCG group, and 3 out of 15 (20%) in placebo group responded to the treatment (P < 0.002). Responders were defined the patients with more than 40% improvement in the symptoms of interstitial cystitis. The global improvement in symptoms and signs of interstitial cystitis was 62%. Adverse events were similar in both groups, mostly irritative in nature and no significant systemic event was noted. BCG did not worsen interstitial cystitis symptoms. Conclusion: We concluded that intravesical BCG is safe, effective, available, and inexpensive with relatively durable results in the treatment of interstitial cystitis.
Results of Buccal Mucosal Graft Urethroplasty in Complex Hypospadias
Darioush Irani,Payman Hekmati,Alireza Amin-Sharifi
Urology Journal , 2005,
Abstract: Introduction: Urethral reconstruction in complex hypospadias poses a significant challenge. We report our experience using buccal mucosa to repair complex hypospadias. Materials and Methods: From February 2001 to September 2003, 16 urethral reconstructions were performed using buccal mucosal graft. Twelve of the patients had previously failed urethroplasties, while the other 4 had perineal or scrotal hypospadias. Grafts were harvested from the lower lip. Onlay grafts were used in 8 cases, and tubularized grafts were used for the others. Results: After 14 to 27 months’ follow-up, 11 of 16 (69%) patients developed complications, including meatal stenosis in 2 (12.5%), urethral stricture in 5 (31%), and urethrocutaneous fistula in 4 (25%). No oral complications were seen, and all of the urethroplasty complications were managed successfully. Conclusion: Urethroplasty using a buccal mucosal graft may be accompanied by a relatively high complication rate, which is more common in patients with tubularized graft; however, all complications can be managed successfully. We believe that urethroplasty using buccal mucosal graft in complex hypospadias is an acceptable treatment modality.
Resolving a Challenge in the Modeling of Hydrogen Production Using Steam Reforming of Methane in Monolith Reactors Using CFD Methods  [PDF]
Mohammad Irani
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24B063
Abstract: Reaction modeling of SMR (Steam Methane Reforming) process inside monolith reactors using two approaches were investigated and compared with each other. In the first approach, the reactions were assumed to take place exactly on the wall surfaces, while in the second approach they considered inside a thin thickness near the walls. Experiments of SMR were carried out in a lab-scale monolith reactor. A single-channel was considered and CFD model were developed for each of aforementioned approaches. Comparisons between modeling results and experimental data showed that the first approach (surface model) gives better results. Performing reactions are difficult and expensive, CFD simulations are considered as numerical experiments in many cases. It was concluded that obtained results from CFD analysis gives precise guidelines for further studies on optimization of SMR monolithic reactor performance.
Resolving a challenge in the modeling of hydrogen production using steam reforming of Methane in monolith reactors using CFD methods  [PDF]
Mohammad Irani
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24b065
Abstract: Reaction modeling  of SMR (Steam Methane Reforming) process inside monolith reactors using two approaches were investigated  and compared with each other. In the first approach, the reactions were assumed to take place exactly on the wall surfaces, while  in the second approach they considered inside a thin thickness near the walls. Experiments of  SMR  were carried out in a lab-scale monolith reactor. A single-channel was considered and CFD model were developed for each of aforementioned approaches. Comparisons between modeling results and experimental data showed that the first approach (surface model) gives better results. Performing reactions are difficult and expensive, CFD simulations are considered as numerical experiments in many cases . It was concluded that obtained results from CFD analysis gives precise guidelines for further studies on optimization of SMR monolithic reactor performance.
Microbiostratigrapy of the Paleocene-Lower Eocene Sequences in the Bibi Hakimeh 2 Subsurface Section Located in the SW of Iran  [PDF]
Fatemeh Moradian, Darioush Baghbani, Mohsen Allameh
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.72010
Abstract: This paper investigates the biostratigraphy of the Palaeocene-Lower Eocene sequences in the Bibi Hakimeh 2 subsurface/subterranean sections located in the Bibi Hakimeh Oil Field. The Palaeocene-Lower Eocene sequences are induced as part of the Pabdeh Formation. They are 49 m in thickness and are made up of clayey limestone with chert intercalations. Biostratigraphic investigations identified 10 genera and 51 species of Planktonic Foraminifera which with respect to the specific planktonic species and according to the newest Wade Biozonation led to the determination of 9 biozones and 4 subzones. The Palaeocene-Early Eocene biostratigraphic boundary determined previously in accordance with the Wynd Biozonation was reviewed with respect to the new biozonation. Moreover, the impression of the PETM on the Planktonic Foraminifera found in the Bibi Hakimeh subsurface section, has been occurred at P/E boundary on global scale was studied. Based on this research we can conclude the P/E biostratigraphic boundary border is occurred ranges between 2125 - 2124 meters in Pabdeh formation.
SCIENTIFIC PRODUCTION OF ENTROPY AND INFORMATION THEORY IN BRAZILIAN JOURNALS
Irani Rocha
JISTEM - Journal of Information Systems and Technology Management , 2012,
Abstract: This article aims at giving an overview of the scientific production about Entropy and Information Theory in national periodical publications in Qualis/CAPES. This article is a descriptive research and a bibliometric study with a quantitative approach. Its sample is composed of 31 articles from periodic publications from different areas, such as: Accounting, Economy, Computer Sciences, Electrical and Hydraulic Engineering, Sciences, Mathematics, Physics and, also, articles that were published in an electronic library called Scientific Electronic Library Online (Scielo) from 2002 to 2009. Among the results, one was able to notice that the “B5” (Qualis Capes) classification has shown a higher number of articles, as well as that 2008 was the year with a higher number of publications
The Complexity of Quantum Systems on a One-dimensional Chain
Sandy Irani
Physics , 2007,
Abstract: We prove that adiabatic computation is equivalent to standard quantum computation even when the adiabatic quantum system is restricted to be a set of particles on a one-dimensional chain. We give a construction that uses a 2-local Hamiltonian on nearest neighbors using particles that can have ten distinct states. This implies a construction of a one-dimensional chain of qubits in which the Hamiltonian is 6-local. We adapt this construction to show that the 2-local Hamiltonian for 13-state particles is QMA-complete which in turn implies that the 8-local Hamiltonian restricted to a one-dimensional chain of qubits is QMA-complete.
Ground State Entanglement in One Dimensional Translationally Invariant Quantum Systems
Sandy Irani
Mathematics , 2009, DOI: 10.1063/1.3254321
Abstract: We examine whether it is possible for one-dimensional translationally-invariant Hamiltonians to have ground states with a high degree of entanglement. We present a family of translationally invariant Hamiltonians {H_n} for the infinite chain. The spectral gap of H_n is Omega(1/poly(n)). Moreover, for any state in the ground space of H_n and any m, there are regions of size m with entanglement entropy Omega(min{m,n}). A similar construction yields translationally-invariant Hamiltonians for finite chains that have unique ground states exhibiting high entanglement. The area law proven by Hastings gives a constant upper bound on the entanglement entropy for 1D ground states that is independent of the size of the region but exponentially dependent on 1/Delta, where Delta is the spectral gap. This paper provides a lower bound, showing a family of Hamiltonians for which the entanglement entropy scales polynomially with 1/Delta. Previously, the best known such bound was logarithmic in 1/Delta.
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