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- 저자 : Jamaati, H (검색결과 4 건)
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Risk Factors for Lung Cancer Mortality in a Referral Center
Jamaati, H,Baghaei, P,Sharifianfard, M,Emami, H,Najmi, K,Seifi, S,Salimi, B,Pourabdollah, M,Kiani, A,Hashemian, M,Khosravi, A Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.6
Background: Lung cancer is one of the most common causes of death that is rising in many countries including Iran. This study aimed to determine the impact of factors on survival of lung cancer patients at a referral center of lung diseases in Tehran, Iran. Materials and Methods: A retrospective study was conducted on adult lung cancer cases admitted to a referral center for lung diseases from 2011 to 2015. Multivariate analysis was performed to determine the risk factors for all-cause mortality. Results: Of a total 933 patients with lung cancer, 53.4% died, 49.3% of them at the hospital. Overall median follow-up time was 7 months. The most common histological type of cancer was adenocarcinoma with a 13 month median survival time. Age ${\geq}55$ and smoking remained significant for all-cause mortality on Cox analysis, whereas gender was not. Conclusions: The survival of lung cancer patients is poor and the patients with history of smoking and age${\geq}55$ are at increased risk of death. Having a large hospital-based registry provides a good measurement of prognostic statistics for lung cancer. Further investigations are necessary to establish reasons for mortality.
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Amin Babapour,Seyed Jamal Hosseinipour,Roohollah Jamaati,Majid Abbasi 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.6
In the present work, the interaction of Sb and initial annealing before single-roll drive rolling on the microstructure, crystallographictexture, and magnetic behavior of 1.2 wt% Si steel was studied. Steel ingots with different antimony percentageswere produced under the Ar atmosphere. After homogenization, they were subjected to symmetric hot-rolling. The producedsheets were then divided into two groups. The first group was cold-rolled to 1 mm thickness using a single-roll drive rollingmachine, while the second group was subjected to initial annealing before asymmetric cold-rolling. Finally, all sampleswere annealed at 1000 °C for 3 min. Microstructural studies showed that with the addition of antimony, the mean grain sizeof samples was decreased. This effect was less significant in samples subjected to initial annealing. Moreover, the additionof antimony positively affected the desired texture. In specific, it yielded a gradual increase of θ-fiber in samples. Theintensity of θ-fiber was higher in samples subjected to initial annealing compared with those without initial annealing. Thecomparison of the effect of average grain size and texture on magnetic behavior showed that grain size acted as the dominantparameter as the coercivity and remanence increased with decreasing grain size. However, in constant grain size, thetexture played the main role in enhancing the magnetic behavior by increasing the θ-fiber intensity. The results showed thatthe combination of antimony and initial annealing before single-roll drive rolling resulted in the best magnetic performancein a low silicon steel sheet.
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Mohabbat Amirnejad,Mohammad Rajabi,Roohollah Jamaati 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
The exclusive effect of crystallographic texture and microstructure on biocorrosion behavior, wettability and biocompatibilityof Ti6Al4V (Ti64) alloy has been studied. Potentiodynamic polarization and EIS results showed that the DA-TD surface, inwhich {0002} and 1120 crystallographic planes are placed parallel to the surface, exhibited the most inferior corrosionrate of 2.2 × 10–5 mm/year. It was shown that this was due to the formation of a thick oxide layer on the surface as a resultof the high surface energy. In contrast, the 1010 planes are most susceptible to corrosion as a result of a thin oxide layerformed on the surface. Most inferior water contact angle of 63.5° (indicatimg more hydrophilicity) belonged to the DA-TDsurface with high surface energy. Moreover, the MTT assay showed that the existence of {0002} and 1120 high-energyplanes parallel to the surface leads to the high MG-63 cell viability percentage at 24, 48, and 72 h.
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Textural Evaluation of Al–Si–Cu Alloy Processed by Route BC-ECAP
Esmaeil Damavandi,Salman Nourouzi,Sayed Mahmood Rabiee,Roohollah Jamaati,Jerzy A. Szpunar 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
In this study, route Bc of the equal channel angular pressing (ECAP) method has been successfully applied to the Al–Si–Cualloy at 400 °C. Scanning electron microscopy (SEM) and electron backscatter difraction (EBSD) were used to analyze themicrostructure. Texture evolution was studied by the X-ray difraction (XRD) technique. The microstructural results showedthat at least four passes of route BC need to access uniform distribution of fne intermetallic compounds (IMCs) and eutecticsilicon particles (ESPs). The particle stimulated nucleation (PSN) and continuous dynamic recrystallization (CDRX) aretwo important mechanisms to refne the aluminum matrix in Al–Si–Cu alloy. The texture results revealed that owing to achange in the rotation direction of route BC in consecutive passes, this process led to creating diferent types of textures, inboth qualitative and quantitative senses. The A*1Ѳ and A*2Ѳ were the strongest texture components after the fourth pass ofroute BC. Regardless of route A, the route BC-ECAP process led to strengthen the {100}⟨001⟩ and {011}⟨100⟩ componentsand weaken the {001}⟨310⟩ component. Three components, {100}⟨110⟩, {021}⟨501⟩, and {013}⟨313⟩ were developed byroute BC. The efects of route BC on texture homogeneity were also studied.
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