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Mesoporous 촉매 지지체를 활용한 온화조건의 수첨탈산소반응
( Pouya Sirous Rezaei ),김지희,정재훈,박영권 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
바이오매스 열분해 공정을 통해 얻어지는 바이오오일은 현재 액체 연료로의 전환을 통해 에너지 공급 문제를 완화할 수 있는 잠재력이 높은 물질로서 이에 대한 upgrading 공정을 연구하였다. 기존 원료 feedstock 내에 기본적으로 수분 및 구조적으로 산소가 포함되어있어 바이오오일의 화학산업으로의 적용을 위해서는 필수적으로 이러한 산소 함량을 낮추기위한 upgrading 공정이 요구된다. 따라서 바이오오일의 성능 향상을 위해 수첨탈산소(Hydrodeoxygenation) 반응을 적용하였으며, 그 결과 높은 산소함량으로 인한 낮은 발열량, 산화로 인한 안정성 약화 및 유기산에 대한 높은 함량으로 인한 부식성이 높다는 문제점을 해결할 뿐 아니라 고부가가치 물질에 대한 선택도가 향상됨을 확인하였다. 본 반응을 위한 촉매로는 Mesoporous 촉매에 금속활성종을 담지하여 반응효율을 향상시키고자 하였다. <sup>**</sup> This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education(2017R1D1A1B03028818).
Endovascular Removal of Entrapped Central Venous Catheter Guide Wire
Pouya Tayebi 대한혈관외과학회 2020 Vascular Specialist International Vol.36 No.1
I present the case of a 24-year-old female patient with a guidewire entrapment during central venous catheter insertion. At first, open surgery was considered to remove the entrapped guidewire; however, after vascular surgery consult, it was removed by a simple endovascular procedure described below in detail.
Pouya Salehi,Hessameddin Yaghoobi,Mohsen Torabi 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.9
Large deflection of a cantilever beam subjected to a tip-concentrated load is governed by a non-linear differential equation. Since it is hard to find exact or closed-form solutions for this non-linear problem, this paper investigates the aforementioned problem via the differential transformation method (DTM) and the variational iteration method (VIM), which are well-known approximate analytical solutions. The mathematical formulation is yielded to a non-linear two-point boundary value problem. In this study, we compare the DTM and VIM results, with those of Adomian decomposition method (ADM) and the established numerical solution obtained by the Richardson extrapolation in order to verify the accuracy of the proposed methods. As an important result, it is depicted from tabulated data that the DTM results are more accurate in comparison with those obtained by the VIM and ADM, which is one of the objectives of this article. Moreover, the effects of dimensionless end point load, α , on the slope of any point along the arc length and the dimensionless vertical and horizontal displacements are illustrated and explained. The results reveal that these methods are very effective and convenient in predicting the solution of such problems, and it is predicted that the DTM and VIM can find a wide application in new engineering problems.
Pouya Tayebi,Fatemeh Mahmoudlou,Yasaman Daryabari,Atefeh Shamsian 대한혈관외과학회 2020 Vascular Specialist International Vol.36 No.4
The creation of an arteriovenous fistula instead of a synthetic vascular graft is asmart decision in hemodialysis patients who do not have a suitable superficial vein. Basilic vein transposition (BVT) is a viable option in most cases, except in patientswho do not have a proper basilic vein. In patients with inadequate superficial veins,another source of the autogenous vein is the brachial vein, a deep vein of the upperarm. Most surgeons choose a full medial arm incision to perform brachial veinexploration. We describe a patient in whom BVT was not possible and so brachialvein transposition using skip incisions was performed, with good results.
The Avon Patellofemoral Joint Replacement: Mid-Term Prospective Results from an Independent Centre
Pouya Akhbari,Tamer Malak,Sebastian Dawson-Bowling,Debra East,Kim Miles,P. Adrian Butler-Manuel 대한정형외과학회 2015 Clinics in Orthopedic Surgery Vol.7 No.2
Approximately 10% of patients with osteoarthritis (OA) of the knee have unicompartmental OA confined to the patellofemoral joint (PFJ). The main surgical options are total knee replacement (TKR) and PFJ replacement (PFJR). PFJR has a number of advantages over TKR, including being less invasive, preserving the unaffected parts of the knee, allowing faster recovery and better range of motion and function. We report our prospective mid-term results of the Avon PFJR for established isolated PFJ arthritis in 61 consecutive procedures. Methods: Sixty-one Avon PFJRs were performed in 57 patients. The outcome measures were the new Oxford knee score (OKS), Hungerford and Kenna score (HKS), and Crosby Insall knee scores. Only patients with severe isolated PFJ OA were included. The diagnosis was based on a combination of clinical, radiological and, where available, arthroscopic findings. Results: Mean follow-up was 5.09 years (range, 12 to 124 years). There were 2 revisions in the first 5 years. The median HKS score was 80 (interquartile range, 70 to 95) and the mean OKS was 31.8 (± standard deviation, 8.7) at 5 years. These were significantly better (p < 0.001) than the preoperative scores. Conclusions: The Avon prosthesis gives good functional outcomes in the medium term and survives well. Our data support other studies in the literature and is the largest independent prospective study to date.
배기가스 상에서 산화제를 이용한 SOx, NOx 동시 제거
( Pouya Sirous Rezaei ),황유진,정재훈,김지희,박영권 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
SOx, NOx는 대기중의 2차 생성 미세먼지를 발생시키는 전구물질이며 도색 공장, 유리 공장 등과 같은 중소형 연소시설에서 1차 미세먼지와 함께 다량 배출되고 있다. 중소형 연소시설은 주거지역과 인접하고 영세 사업장이 많아 오염 체감도가 크지만 현재 SOx, NOx의 처리는 각각 단일 설비로 되어있어 운전상, 경제상의 문제 등을 가지고 있다. 최근에 한 개의 시스템에 SOx, NOx를 동시에 처리하고자 하는 연구가 진행 중이다. 따라서 본 연구에서는 배기가스 분위기인 SOx, NOx에 산화제(O3 등)를 이용하여 동시에 제거하는 실험을 진행하였고 실험조건(산화제 농도, 반응기 수 등)의 변화에 따른 SOx, NOx 제거율을 확인하였다. <sup>**</sup> 본 연구는 2017년도 정부(과학기술정보통신부, 환경부, 보건복지부)의 재원으로 한국연구재단-미세먼지 국가전략프로젝트사업의 지원을 받아 수행된 기초연구 사업임(No. 2017M3D8A1092029).
Seismic retrofit of steel buildings using external resistant RC walls and friction dampers
Pouya Mostoufi Afshar,Seyed Mehdi Zahrai 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.6
In this research, the idea of improving the seismic response of an existing steel structure with use of friction dampers between external walls and the structure is discussed. The main difference of this method with other methods of seismic rehabilitation is that interior spaces of the existing structure remain untouched and new parts including external walls and dampers are added outside of the structure. Three frames having 3, 6 and 9 stories are modeled in SAP2000 software before and after seismic retrofit and responses of the system are investigated under the effect of seven earthquake records. Initially, different ratios of seismic weight of stories are presumed for slip forces of the dampers with a distribution based on given equations. The optimized capacity of dampers is obtained by investigating the average of maximum displacement, acceleration and base shear of the structure caused by earthquakes. For this optimized values, maximum inter-story drifts and acceleration are obtained through numerical models. Results show that in 3, 6 and 9-story frames peak roof displacement decreased up to 80%. Maximum roof acceleration and base shear of the frames also decreased 46, 40 and 32% and 84, 67 and 65%, respectively for three building structures.
A New Approach for Applying a Non-conductive Mandrel in Electroforming of Complex Bellows-Shape
Pouya Fahimi Azad,Hamid Montazerolghaem 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.6
In this research, innovatively a flexible non-conductive polymer mandrel by applying graphite was used instead of conventional metal mandrels. To achieve a uniform shell thickness, a helical anode instead of usual flat anode and pulse reverse current instead of constant current were utilized. In this research, the effects of parameters such as current, pulse-forward time, pulse-reverse time on copper bellows-shape parts using pulse-reverse current in order to obtain proper thickness uniformity and hardness was investigated. To optimize the electroforming parameters, Response Surface Method (RSM) was applied. The optimum pulse-reverse and pulse-forward time for the set of parameters used in the experiments was determined to be I = 2A, TF = 8 ms and TR = 3.5 ms. Consequently, results showed that the type of current had a dominant effect on the uniformity of the copper bellows-shape parts on the non-conductive mandrel and the pules-reverse time played a significant role in obtaining efficient mechanical properties.