Remote sensing analysis of unknown origin of a crater in western Yemen

Mohammad Reza Mansouri Daneshvar,Hamid Nejadsoleymani 대한공간정보학회 2017 Spatial Information Research Vol.25 No.4

The present study aims to detect unknown origin of a terrestrial structure in western Yemen based on the remote sensing procedure in order to enhance scientific database on the possible impact craters in the Middle Eastern countries. On this basis, a crater-shaped structure, named as Salab crater, was detected with a diameter of ~3.2-km. Topographical study indicated a circular morphology with two rings. Interior ring has a diameter of ~1-km and depth of ~100-m, while exterior ring has a diameter of ~2.2-km and depth of ~400-m. According to the geological data, the crater environ mainly has the different units outcropped of the Jurassic Amran limestone, the Cretaceous Tawilah sandstone, and the late Oligocene to early Miocene volcanic groups and intrusions. We indicated that the Salab crater is entirely located on Jurassic limestone of Amran group bedrocks with poor aquifer, low potential of water productivity and impure limestone deposits. Hence, the Salab crater could not be categorized as a volcanic crater or a karstic product. In addition, it could not be the remained from a salt-dome or a certain active hydrothermal pattern of springs. Nevertheless, to distinguish of the crater from old and fossil travertine crater or a possible impact crater, a detailed field work and a petrology investigation should be considered.

Quantitative-fuzzy Controller Design for Multivariable Systems with Uncertainty

Mohammad Reza Gharib,Armin Daneshvar 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.6

This work serves as a pioneer contribution in terms of application of Quantitative Feedback Theory(QFT) methodology and fuzzy logic method to design a controller for MIMO systems. Due to the presence of uncertainty in multivariable dynamic systems, the application of robust control methods for achieving high accuracy in tracking is inevitable. On the other hand, application of QFT to MIMO uncertain systems still remains to be one of the most difficult control problems for engineers. In this paper, authors attempt to simplify the MIMO control problem by proposing a new algorithm which joins QFT and fuzzy techniques. In order to illustrate the utility of the proposed algorithm, its application on a two degree of freedom link robot manipulator is depicted. Initially, a QFT controller is designed for each link to overcome the track and disturbance rejection problems. Then, a bi-level tuned PDfuzzy controller is employed as one strategy for curbing probable errors in the previous controller. The controller design was carried in the following stages; first, a linear PD controller independently applied to each actuator. Then, fuzzy rules were developed to design a fuzzy PD controller. Fuzzy controller normalizing parameters were regulated according to maximum PD control errors. In the second stage, named nonlinear tuning, other parameters of the fuzzy controller were tuned using genetic algorithms. Finally,nonlinear simulations of arbitrary path tracking shows that the proposed controller has a consistent tracking ability,and also it can clearly be seen that the mentioned approach is precise and very simple in comparison to other MIMO control techniques.

Survival of Colorectal Cancer in the Presence of Competing-Risks - Modeling by Weibull Distribution

Baghestani, Ahmad Reza,Daneshvar, Tahoura,Pourhoseingholi, Mohamad Amin,Asadzadeh, Hamid Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.3

Background: Colorectal cancer (CRC) is the commonest malignancy in the lower gastrointestinal tract in both men and women. It is the third leading cause of cancer-dependent death in the world. In Iran the incidence of colorectal cancer has increased during the last 25 years. Materials and Methods: In this article we analyzed the survival of 447 colorectal patients of Taleghani hospital in Tehran using parametric competing-risks models. The cancers of these patients were diagnosed during 1985 - 2012 and followed up to 2013. The purpose was to assess the association between survival of patients with colorectal cancer in the presence of competing-risks and prognostic factors using parametric models. The analysis was carried out using R software version 3.0.2. Results: The prognostic variables included in the model were age at diagnosis, tumour site, body mass index and sex. The effect of age at diagnosis and body mass index on survival time was statistically significant. The median survival for Iranian patients with colorectal cancer is about 20 years. Conclusions: Survival function based on Weibull model compared with Kaplan-Meier survival function is smooth. Iranian data suggest a younger age distribution compared to Western reports for CRC.

Survival of Colorectal Cancer Patients in the Presence of Competing-Risk

Baghestani, Ahmad Reza,Daneshvar, Tahoura,Pourhoseingholi, Mohamad Amin,Asadzade, Hamid Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.15

Background: Colorectal cancer (CRC) is considered to be a main cause of malignancy-related death in the world, being commonly diagnosed in both men and women. It is the third leading cause of cancer dependent death in the world and there are one million new cases diagnosed per year. In Iran the incidence of colorectal cancer has increased during the last 25 years and it is the fifth cause of cancer in men and the third in women. Materials and Methods: In this article we analyzed the survival of 475 colorectal patients of Taleghani hospital in Tehran with the semi-parametric competing-risks model. Results: There were 55% male cases and at the time of the diagnosis most of the patients were between 48 and 67years old. The probability of a patient death from colorectal cancer with survival of more than 25 years was about 0.4. Body mass index, height, tumour site and gender had no influence. Conclusions: According to these data and by using semi-parametric competing-risks method, we found out that only age at diagnosis has a significant effect on these patient survival time.

Phenol-acclimated activated sludge and Ralstonia eutropha in a microbial fuel Cell for removal of olive oil from mill wastewater

Mahboobeh Bagheri,Reza Daneshvar,Azadeh Mogharei,Farzaneh Vahabzadeh 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.7

The fuel acclimation process offers flexibility in microbial fuel cell (MFC) power generation behavior. Different concentrations (50-200mg/L) of phenol were used for adapting the activated sludge (AS), obtained from a local petroleum wastewater treatment plant and Ralstonia eutropha pure culture. Anodic biomass capable of oxidizing phenol substrate, using either AS inoculum microbial consortium or R. eutropha in the MFC system, has been a reflection of growth supportive functionality of phenol and 150mg/L as initial concentration was used in the experiments. For both types of inocula. The results of phenol and COD removals obtained for closed system configuration were compared with those under open circuit condition. The current production by AS and R. eutropha was improved through phenol acclimation process. The highest power density (PD) using either AS or R. eutropha was 11 and 5.8mW/m2, respectively. In terms of using olive oil mill wastewater as the anodic substrate, the behavior of phenol-acclimated R. eutropha was better than that of the synthetic type of wastewater, and the PD value was 7.8mW/m2.

Geo-statistical modeling of mean annual rainfall over the Iran using ECMWF database

Robab Razmi,Saeed Balyani,Mohammad Reza Mansouri Daneshvar 대한공간정보학회 2017 Spatial Information Research Vol.25 No.2

In the present study, the main aim was the spatial evaluation annual rainfall of Iran based on the European Centre for Medium Range Weather Forecast (ECMWF) database. An attempt, using geo-statistical modeling by ordinary least squares (OLS) and geographically weighted regression (GWR) procedures, was also made. The results represented that the GWR model with higher S2, lower residuals without spatial autocorrelation effect and lower RMSE is an optimized geo-statistical model for rainfall modeling of Iran based on ECMWF gridded database. This model can explain spatio-temporal rainfall distribution in Iran in a diversified topographical and geographical background. This model revealed that two high mountain ranges of Zagros and Alborz in west and north, respectively, strikingly affect the temporal and spatial patterns of rainfall. Therefore, the statistical correlation matrix revealed that Iranian rainfall data is dominantly depended on geographical latitude and topographical altitude/slope with 0.56 and 0.32 correlation coefficients, respectively.

Survivin, a Promising Gene for Targeted Cancer Treatment

Shamsabadi, Fatemeh T,Eidgahi, Mohammad Reza Akbari,Mehrbod, Parvaneh,Daneshvar, Nasibeh,Allaudin, Zeenathul Nazariah,Yamchi, Ahad,Shahbazi, Majid Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.8

Drawbacks of conventional cancer treatments, with lack of specificity and cytotoxicity using current approaches, underlies the necessity for development of a novel approach, gene-directed cancer therapy. This has provided novel technological opportunities in vitro and in vivo. This review focuses on a member of an apoptosis inhibitor family, survivin, as a valuable target. Not only the gene but also its promoter are applicable in this context. This article is based on a literature survey, with especial attention to RNA interference as well as tumor-specific promoter action. The search engine and databases utilized were Science direct, PubMed, MEDLINE and Google. In addition to cell-cycle modulation, apoptosis inhibition, interaction in cell-signaling pathways, cancer-selective expression, survivin also may be considered as specific target through its promoter as a novel treatment for cancer. Our purpose in writing this article was to create awareness in researchers, emphasizing relation of survivin gene expression to potential cancer treatment. The principal result and major conclusion of this manuscript are that survivin structure, biological functions and applications of RNA interference systems as well as tumor-specific promoter activity are of major interest for cancer gene therapy.

Lactobacillus acidophilus and Lactobacillus crispatus Culture Supernatants Downregulate Expression of Cancer-testis Genes in the MDA-MB-231 Cell Line

Azam, Rosa,Ghafouri-Fard, Soudeh,Tabrizi, Mina,Modarressi, Mohammad-Hossein,Ebrahimzadeh-Vesal, Reza,Daneshvar, Maryam,Mobasheri, Maryam Beigom,Motevaseli, Elahe Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.10

Lactobacilli are probiotics shown to have antitumor activities. In addition, they can regulate gene expression through epigenetic mechanisms. In this study, we aimed to assess anti tumor activities of Lactobacillus acidophilus and Lactobacillus crispatus on the MDA-MB-231 breast cancer cell line. The effects of culture supernatants were determined by MTT [3-(4,5-dimethylthiazol-2-y-2,5-diphenyltetrazolium bromide] assay. Changes in expression of 5 cancer-testis antigens (CTAs), namely AKAP4, ODF4, PIWIL2, RHOXF2 and TSGA10, were analyzed by quantitative real time RT-PCR. The culture supernatants of the 2 lactobacilli inhibited MDA-MB-231 cell proliferation. In addition, transcriptional activity of all mentioned CTAs except AKAP4 was significantly decreased after 24 hour treatment with culture supernatants. This study shows that Lactobacillus acidophilus and Lactobacillus crispatus have antiproliferative activity against MDA-MB-231 cells. In addition, these lactobacilli could decrease transcriptional activity of 4 CTAs. Previous studies have shown that expression of CTAs is epigenetically regulated, so it is possible that lactobacilli cause this expression downregulation through epigenetic mechanisms. As expression of CTAs in cancers is usually associated with higher grades and poor prognosis, downregulation of their expression by lactobacilli may have clinical implications.