An Investigation of Volcanic Ground Deformation Using InSAR Observations at Tendürek Volcano (Turkey)

Although approximately one-tenth of the world’s population lives near volcanoes, most of the 1500 active volcanoes are not monitored by ground-based instruments because of the cost and difficulty of access. Since the development of interferometric synthetic aperture radar (InSAR) in the 1990s, recent advances have allowed the near-real-time detection of surface deformations, one of the earliest markers of volcanic activity. According to the Global Volcanism Program, Turkey’s most recent eruption (involving gas and ash) occurred in the Tendürek volcano in 1885. An explosion in the Tendürek volcano, which continues to actively output gas and steam, would be a critical issue for the life and property of the people living nearby. In this context, we processed the Sentinel-1 data collected by the European Space Agency using the Stanford Method for Persistent Scatterers, and the surface deformations of the Tendürek volcano were investigated. In addition, we applied two different atmospheric correction approaches (linear phase-based tropospheric correction and the Generic Atmospheric Correction Online Service for InSAR) to reduce atmospheric effects and found that the linear phase-based tropospheric correction model produced lower standard deviation values. Subsequently, the mean deformation velocity maps, displacement time series, and deformation components in the line-of-sight direction were calculated. The results showed that the most severe subsidence was −11 mm/yr on the upper slopes of the Tendürek volcano. Although the lower slopes of the subsidence region have a lower settlement rate, the subsidence has a peak-caldera-centered location

Experimental and Numerical Analysis of Epoxy Based Adhesive Failure on Mono- and Bi-Material Single Lap Joints Under Different Displacement Rates

Development in material science impose to use different materials in production. This causes a problem for joining different materials because traditional joining techniques such as welding could not overcome this problem in industries such as automotive. Hence, adhesive bonding overcomes this problem by its superiorities to join different materials. Joint strength of epoxy-based adhesives are affected by adhesive thickness, adherent’s surface quality and curing conditions. In this study, two different materials (SAE 304 and AL7075) were bonded by epoxy adhesive (3M DP460NS) as single lap joint (SLJ) of Aluminum-Aluminum, Steel-Steel and Aluminum-Steel. Effects of adhesive thickness (0.05, 0.13, 0.25 mm) and surface roughness (281, 193, 81 nm) to strength were compared. SLJs were tested for 1, 10, 25 and 50 mm/min displacement rates. Adhesive surface structures were imaged by Scanning Electron Microscopy (SEM) to investigate adhesive fractures. Surface roughness’s were examined by using Atomic Force Microscopy (AFM) to compare its influence on failure load. Finite Element Analysis (FEA) were conducted by using Cohesive Zone Model with ANSYS 18.0 software to obtain stress distribution of adhesive. Optimum values according to the present conditions of thickness(0.13mm) and roughness(<200nm) were determined. Experimental results were demonstrated that while displacement rates rose, failure loads increased as well. FEA analysis were fit to experimental results. It has been observed that along with material type, peel stresses become an important factor for joint strength.           &nbsp

A WEB BASED SERVICE APPLICATION FOR VISUAL SINKHOLE INVENTORY INFORMATION SYSTEM; CASE STUDY OF KONYA CLOSED BASIN

Sinkholes are commonly defined as deep pits giving the appearance of a chimney or well resulting by collapsing of underground rivers in horizontal or near-bedded lime stones or active cave ceilings. Sinkholes appear as deep pits in the so-called karst land, usually on limestones and carbonates that are easily rinsed with water. The sinkhole occurrences in our country are very often seen on the Obruk Plateau in the Konya Closed Basin. In Karapinar region and its surroundings located in this plateau, especially in recent years surface deformations and sinkhole formations are frequent. The resulting sinkholes in the field of agriculture and occurred in areas close to residential areas is to upset the locals.Several studies have been carried out about the formation of sinkholes in Konya Closed Basin and especially around Karapinar. As a result of the literature survey, different information about the number of sinkholes in the region has been reached. Therefore, an inventory information system that is as up-to-date as daily, accurate, and rich in attribute information (position information, shape, diameter, depth, distance to settlements, year of formation, region etc.), has been created as a result of detailed field work, analyzing satellite images, and examining digital terrain model. The inventory information of the 283 objects created within the scope of the study will be used as support data in the future hazard, risk and planning studies. In addition, the inventory data will be shared through a Web-based system with the relevant people and institutions. The Geoinformation System-like Web application is built using Google Maps and Fusion Tables services for data storage and management, both are free services from Google Inc. The web application's infrastructure includes HTML5, CSS3, JavaScript, Google Maps API V3, and Google Fusion Tables API technologies. Using these technologies, it is possible to create effective map "Mash-Up" applications by adding Google maps to a Web page, where spatial data is stored in Fusion Tables and can be displayed as a layer on Google maps. The sinkhole inventory information system presented with web-based application is handled in detail in this article

(E)-2-{[(2-(Trifluoro­meth­yl)phen­yl]imino­meth­yl}phenol

In the crystal of the title compound, C14H10F3NO, intra­molecular O—H⋯N and O—H⋯F hydrogen bonds generate S(6) and S(10) intramolecular hydrogen-bonded rings. The dihedral angle between the planes of the aromatic rings is 13.00 (14)°

Land subsidence and its relations with sinkhole activity in karapınar region, turkey: A multi-sensor insar time series study

The Karapinar basin, located in the Central Anatolian part of Turkey, is subjected to land subsidence and sinkhole activity due to extensive groundwater withdrawal that began in the early 2000s. In this study, we use Interferometric Synthetic Aperture Radar (InSAR), Global Navigation Satellite System (GNSS), and groundwater level data to monitor and better understand the relations between groundwater extraction, land subsidence, and sinkhole formation in the Karapinar basin. The main observations used in the study are InSAR-derived subsidence velocity maps calculated from both Sentinel-1 (2014–2018) and COSMO-SkyMed (2016–2017) SAR data. Our analysis reveals broad areas of subsidence with rates exceeding 70 mm/yr. The InSAR-derived subsidence was compared with GNSS data acquired by a continuously operating GNSS station located in the study area, which show a similar rate of subsidence. The temporal characteristic of both InSAR and GNSS time series indicate a long-term subsidence signal superimposed by seasonal variability, which follows the overall groundwater level changes, with over 80% cross-correlation consistency. Our results also indicate that sinkhole activity is limited to slow subsidence areas, reflecting strong cohesion of near-surface rock layers that resist subsidence but yield to collapse in response to aquifer system deformation induced by groundwater extraction

Land subsidence and its relations with sinkhole activity in karapınar region, turkey: A multi-sensor insar time series study

The Karapinar basin, located in the Central Anatolian part of Turkey, is subjected to land subsidence and sinkhole activity due to extensive groundwater withdrawal that began in the early 2000s. In this study, we use Interferometric Synthetic Aperture Radar (InSAR), Global Navigation Satellite System (GNSS), and groundwater level data to monitor and better understand the relations between groundwater extraction, land subsidence, and sinkhole formation in the Karapinar basin. The main observations used in the study are InSAR-derived subsidence velocity maps calculated from both Sentinel-1 (2014–2018) and COSMO-SkyMed (2016–2017) SAR data. Our analysis reveals broad areas of subsidence with rates exceeding 70 mm/yr. The InSAR-derived subsidence was compared with GNSS data acquired by a continuously operating GNSS station located in the study area, which show a similar rate of subsidence. The temporal characteristic of both InSAR and GNSS time series indicate a long-term subsidence signal superimposed by seasonal variability, which follows the overall groundwater level changes, with over 80% cross-correlation consistency. Our results also indicate that sinkhole activity is limited to slow subsidence areas, reflecting strong cohesion of near-surface rock layers that resist subsidence but yield to collapse in response to aquifer system deformation induced by groundwater extraction

Single step therapy for abscess foci localized at different parts of the body using trocar type catheter: Results of two year-experience

Objectives: The aim of this study was to emphasize the feasibility and cost effectiveness of trocar type catheter in percutaneous abscess drainage under imaging guidance and to determine the clinical efficacy of the method.Materials and methods: From June 2008 to December 2010, 48 patients who were referred to interventional radiology unit, in order to undergo percutaneous abscess drainage. All was data including age, the organ or the part of the body where the abscess was localized and size of abscess were recorded. Forty-two (87%) patients underwent drainage with ultrasonographic guidance, while 6 (13%) underwent with computed tomography guidance. One pediatric patient underwent systemic sedation anesthesia (with remiphentanyl and midazolam) and the rest of the patient with local anesthesia (with prilocain hydrochlorid). Catheterization procedure with which abscess drainage was done accepted as technically successful.Results: Imaging guided percutaneous abscess drainage procedures were performed with trocar type catheter to localized abscesses in different organs or systems in 48 patients (25 men, 23 women, mean age 52 years, range 2-82 years). Technical success was 100% in all cases. No patient had a complication during the procedure. Time to extraction of percutaneous catheter after drainage procedure was 5-28 days (mean 11.2 days). There was no recurrence except for a case, in which an abscess at the splenectomy site was successfully drained.Conclusion: Percutaneous drainage with imaging guidance using the trocar type catheter should be preferred because of its feasibility, cost-effectiveness, and reduced rate of complications in treating abscesses, which localized at different organ systems

The Association between Myocardial Iron Load and Ventricular Repolarization Parameters in Asymptomatic Beta-Thalassemia Patients

Previous studies have demonstrated impaired ventricular repolarization in patients with β-TM. However, the effect of iron overload with cardiac T2* magnetic resonance imaging (MRI) on cardiac repolarization remains unclear yet. We aimed to examine relationship between repolarization parameters and iron loading using cardiac T2* MRI in asymptomatic β-TM patients. Twenty-two β-TM patients and 22 age- and gender-matched healthy controls were enrolled to the study. From the 12-lead surface electrocardiography, regional and transmyocardial repolarization parameters were evaluated manually by two experienced cardiologists. All patients were also undergone MRI for cardiac T2* evaluation. Cardiac T2* score <20 msec was considered as iron overload status. Of the QT parameters, QT duration, corrected QT interval, and QT peak duration were significantly longer in the β-TM group compared to the healthy controls. Tp − Te and Tp − Te dispersions were also significantly prolonged in β-TM group compared to healthy controls. (Tp − Te)/QT was similar between groups. There was no correlation between repolarization parameters and cardiac T2* MRI values. In conclusion, although repolarization parameters were prolonged in asymptomatic β-TM patients compared with control, we could not find any relation between ECG findings and cardiac iron load

Effects of Combined Aerobic and Strength Training on Aerobic Capacity and Body Composition

The purpose of this study was to analyse the effects of combined aerobic and strength training in circuit training on body fat ratio. The universe of this study was selected as 32 male participants who continue their training and do fitness for health. Participants were divided into 2 groups: aerobic group (16 people) and combined group (16 people). This study was applied for 8 weeks, 3 days per week, and 1 hour per day. Participants were informed about how the tests will be conducted. An aerobic capacity test, body fat percentage, body mass index, and waist-hip ratio were among the applied tests and measurements. Data were analysed with SPSS 21 package program. Average and standard deviation of obtained data were calculated. Results showed that results of aerobic and combined trainings were similarly, and both aerobic and combined training positively affected body weight, body mass index, body fat percentage, and aerobic capacity values. Additionally, it can be stated that aerobic exercises directly affected waist-hip ratio compared to combined exercises, and combined training was more efficient for waist-hip ratio