Rheological and Thermal Characterization of AISI 4605 Low‑Alloy Steel Feedstock for Metal Injection Molding Process

Ali Askari,Mohammad Hossein Alaei,Ali Mehdipoor Omrani,Khanali Nekouee,박성진 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.12

In this study, rheological and thermal decomposition behavior of AISI 4605 MIM feedstock investigated using capillaryand thermogravimetric analysis. For this purpose and in order to find the critical solids loading, the feedstock was preparedby compounding AISI 4605 micro powder (~ 4 μm) with an adopted multi-component wax-based binder system at variouspowder loadings (53–61 vol%). After preparing the feedstock with optimal solids loading, fundamental rheological characteristicsof homogenized feedstock, including flow behavior index (n), flow activation energy (E), and general moldabilityindex (αstv) were studied. Furthermore, thermal analysis of feedstock, including apparent debinding activation energy andmaster decomposition curve was investigated. The results showed that critical solids loading of feedstock is around 58 vol%. The flow behavior index of developed feedstock was acceptable, since it came out to be less than one. Also, flow activationenergy which shows the sensitivity of material to temperature changes, came out to be 70.406 kJ/mol. Using these two parameters,general moldability index was calculated to be 2.3147E−06. Finally, the master decomposition curve of feedstock wasconstructed based on calculated apparent debinding activation energy and verified using decomposition curves at differentheating rates of 2, 5 and 10 °C/min.

GeneXpert MTB/RIF Testing in the Management of Patients with Active Tuberculosis; A Real Life Experience from Saudi Arabia

Ali S. Omrani,Mohammed F. Al-Otaibi,Souad M. Al-Ateah,Fahad M. Al-Onazi,Kamran Baig,Noura A. El-Khizzi,Ali M. Albarrak 대한감염학회 2014 Infection and Chemotherapy Vol.46 No.1

Background: GeneXpert MTB/RIF is a real-time PCR assay with established diagnostic performance in pulmonary and extra-pulmonaryforms of tuberculosis. The aim of this study was to assess the contribution of GeneXpert MTB/RIF assay to the management ofpatients with any form of active tuberculosis in a single large tertiary center in Saudi Arabia, with a special focus on the impact ontime to start of antituberculous therapy compared with Ziehl-Neelsen (ZN) smears and mycobacterial cultures. Materials and Methods: Clinical, radiological and laboratory records for all patients who were commenced on antituberculous therapybetween March 2011 and February 2013 were retrospectively reviewed. Results: A total of 140 patients were included, 38.6% of which had pulmonary tuberculosis. GeneXpert MTB/RIF was requested for only39.2% of patients and was the only reason for starting antituberculous therapy for only 12.1%. The median time to a positive GeneXpertMTB/RIF result was 0 days (IQR 3) compared with 0 day (IQR 1) for smear microscopy (P > 0.999) and 22 days (IQR 21) for mycobacterialcultures (P < 0.001). No patients discontinued antituberculous therapy because of a negative GeneXpert MTB/RIF result. Conclusions: In a setting wherein physicians are highly experienced in the diagnosis and treatment of tuberculosis, GeneXpertMTB/RIF was remarkably under-utilized and had only a limited impact on decisions related to starting or stopping antituberculoustherapy. Cost-effectiveness and clinical utility of routine testing of all smear-negative clinical samples submitted for tuberculosisinvestigations by GeneXpert MTB/RIF warrant further study.

Structure–rheology characterization of whey-less Feta cheese containing milk protein concentrate/soy protein isolate

Newsha Omrani Khiabanian,Ali Motamedzadegan,Shahram Naghizadeh Raisi,Mazdak Alimi 한국유변학회 2022 Korea-Australia rheology journal Vol.34 No.1

In this study, the properties of whey-less Feta cheese (WLFC) manufactured from milk protein concentrate (MPC) with the addition of soy protein isolate (SPI) were investigated. Six treatments were made using different ratios of MPC:SPI (12:0,10:2, 9:3, 8:4, 7:5, 6:6% w/v) and stored for 45 days. Then, the textural properties, rheological behavior of samples, and microstructural and sensory features were evaluated. Furthermore, FTIR spectroscopy was used to provide spectral data on the protein, acids, carbohydrates, lipids, and water. The results showed that different concentrations of SPI significantly affected pH, acidity, total solids (TS), and color parameters. So that, by increasing SPI concentration, the lightness and greenness decreased, and the yellowness increased. The viscoelastic behavior of all samples demonstrated a higher G ′ compared to G ″. The replacement of MPC with SPI decreased G ′, G ″, and texture parameters. The images of the microstructure indicated a weak structure with a more open protein network in WLFCs fortified with high levels of SPI (5, 6%). In conclusion, results showed that SPI could be a good substitution for MPC at a 2–3% concentration without negative effects on WLFCs.

Evaluation of stability in maize hybrids using univariate parametric methods

Seyed Habib Shojaei,Mostafavi Khodadad,Lak Amirparviz,Omrani Ali,Omrani Saeed,Mousavi Seyed Mohammad Nasir,Illés Árpád,Bojtor Csaba,János Nagy 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.3

Genotype × environment interaction is one of the complex issues of breeding programs to produce high-yielding and compatible cultivars. Interaction of genotype × environment and make the more accurate selection, the performance and stability of hybrids need to be considered simultaneously. This study aimed to investigate stable genotypes with yield using 12 maize hybrids in different climatic conditions of Iran. The experimental design used was a randomized complete blocks design in three replications in two cropping years in Karaj, Birjand, Shiraz, and Arak stations. The simple analysis of variance performed on grain yield of genotypes indicated that all hybrids studied each year and station were significantly different in grain yield. Also, the combined analysis results showed a significant effect on the environment, the effects of genotype, and the interaction of genotype × environment and t in the studied hybrids different. Comparing Duncan's mean on the data obtained from the research, KSC705 genotypes with an average yield of 7.21 and KSC704 genotype with an average yield of 7.04 were identified as high yield cultivars. In order to identify stable cultivars, six stability parameters were used. KSC260 and KSC707 genotypes had stability Based on the environmental variance, also had stability based KSC705, KSC707 genotype on environmental the coefficient of variation, and KSC260 genotypes had stability based methods of genotype and environment interaction. As well as based on Eberhart and Russell regression coefficient had the stability to KSC400 and SC647 genotypes. Also, they were identified as the most stable genotypes based on the detection coefficient method, KSC707, and KSC703 genotypes.

Appraisal of Breast Cancer Symptoms by Iranian Women: Entangled Cognitive, Emotional and Socio-Cultural Responses

Khakbazan, Zohreh,Roudsari, Robab Latifnejad,Taghipour, Ali,Mohammadi, Eesa,Pour, Ramesh Omrani Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.19

Background: Breast cancer is the most common cancer in Iranian women and usually features delayed presentation and late diagnosis. Interpretation of symptoms, as the most important step, has a significant impact on patient delay in seeking treatment. There is a dearth of studies on symptom appraisal and the process leading to seeking help in breast cancer patients. This study explored the perceptions and experiences of Iranian women with self-detected possible breast cancer symptoms. Materials and Methods: A qualitative method was conducted involving in-depth semi-structured interviews with 27 Iranian women with self-discovered breast cancer symptoms. Participants were purposefully selected from women who attended Cancer Institute of Tehran University of Medical Sciences during June 2012 to August 2013. The audiotaped interviews were transcribed and analyzed using conventional content analysis with MAXQDA soft ware version 10. The trustworthiness of the study was verified by prolonged engagement, member validation of codes, and thick description. Results: The main concepts emerging from data analysis were categorized in four categories: symptom recognition, labeling of symptoms, interactive understanding, and confronting the fear of cancer. Symptom recognition through breast self-examination, symptom monitoring and employing prior knowledge distinguished normal from abnormal symptoms and accompanied with perception of being at risk of breast cancer led to symptom labeling. Social interaction by selective disclosure and receiving reassurance from a consultant led to confirmation or redefinition of the situation. Perceived seriousness of the situation and social meanings of breast cancer as a stigmatized and incurable illness associated with loss of femininity were reasons for patient worries and fear. Conclusions: This study emphasized that entangled cognitive, emotional and socio-cultural responses affecting understanding of symptom seriousness require further investigation. It is suggested that programs aimed at shortening patient delay in breast cancer should be focused on improving women's knowledge and self-awareness of breast cancer, in addition to correcting their social beliefs.