Acoustic particle palpation for measuring tissue elasticity

We propose acoustic particle palpation – the use of sound to press a population of acoustic particles against an interface – as a method for measuring the qualitative and quantitative mechanical properties of materials. We tested the feasibility of this method by emitting ultrasound pulses across a tunnel of an elastic material filled with microbubbles. Ultrasound stimulated the microbubble cloud to move in the direction of wave propagation, press against the distal surface, and cause deformations relevant for elasticity measurements. Shear waves propagated away from the palpation site with a velocity that was used to estimate the material’s Young’s modulus

Displacement of a bubble by acoustic radiation force into a fluid-tissue interface.

Microbubbles in an ultrasound beam experience a primary Bjerknes force, which pushes the microbubbles against a fluid-tissue interface and deforms the tissue. This interaction has been used to measure tissue elasticity and is a common interaction in many therapeutic and diagnostic applications, but the mechanisms of deformation, and how the deformation dynamic depends on the bubble and ultrasound parameters, remain unknown. In this study, a mathematical model is proposed for the displacement of a bubble onto a fluid-tissue interface and the tissue deformation in response to the primary Bjerknes force. First, a model was derived for static loading and the model's prediction of bubble-mediated tissue displacement and stresses in tissue were explored. Second, the model was updated for dynamic loading. The results showed that the bubble is both displaced by the applied force and changes its shape. The bubble displacement changes nonlinearly with the applied force. The stress values in tissue are quite high for a distance within one radius of the bubble from the bubble surface. The model proposed here is permissible in human tissue and can be used for biomedical ultrasound applications, including material characterization

Quantification of the flow noise in household refrigerators

The flow noise in household refrigerators is quantified in this study. First, the sound pressure measurements in a quiet room using typical household refrigerators are conducted and the noise characteristics of the refrigerators are presented. Then, the flow noise in household refrigerators is quantified using the results of the overall analysis and Fourier transform of the measured sound pressure data. After that, the flow noise in household refrigerators is quantified using the sound pressure measurements conducted using a specially designed test rig. The frequency characteristics of the flow noise in household refrigerators are also explored and the contribution of the flow noise is identified

The Effect of Gender and Attachment Styles on the Relationship between Marital Adjustment and Psychological Symptoms

The aim of this study is to investigate the moderating effects of attachment styles and gender on the predictive strength of marital adjustment on psychological symptoms among Turkish married individuals. Correlational model was used and the sample consisted of 178 married individuals. The data was gathered through online survey. The Turkish form of Brief Symptom Inventory (BFI) was used to measure psychological symptoms. The Turkish form of Dyadic Adjustment Scale (DAS) was used to measure marital adjustment and the Turkish form of Relationship Scales Questionnaire (RSQ) was used to measure attachment styles. The hypothetical model was formed and tested through path analysis technique of structural equational modeling. Results showed that secure, dismissing and fearful attachment styles and gender moderated the predictive strength of marital adjustment on psychological symptoms. It was found that the relationship between marital adjustment and psychological symptom is stronger among individuals who have secure attachment style

Yusufeli ağzı

Bu çalışmada, Artvin ili Yusufeli ilçesinin ağız özelliklerinin standart Türkiye Türkçesi ile benzer ve farklı yönleri ortaya konularak bu değişimlerin sebepleri tespit edilmeye çalışılmıştır. Bu incelemeyi yapmak amacıyla Yusufeli ilçe merkezi ve on sekiz köyden derleme yöntemiyle çeşitli dil malzemeleri toplanmıştır. Bu çalışma; "Giriş, Ses Bilgisi, Şekil Bilgisi, Sonuç, Metinler ve Sözlük" olmak üzere altı bölümden oluşmaktadır. Giriş kısmında Yusufeli'nin coğrafyası, tarihi, Türkiye'de ağız çalışmaları ve Yusufeli ağzı ile ilgili çalışmalar hakkında bilgi verilmiştir. Ses Bilgisi ve Şekil Bilgisi kısmında, bölgenin ses ve şekil özellikleri incelenerek bu bölgenin konuşma dilinin özellikleri ortaya konulmuştur. Sonuç bölümünde Yusufeli ağzı ile ilgili genellemelere varılmaya çalışılmıştır. Metin kısmında, ele alınan otuz metin çeviri yazı işaretleriyle sunulmuştur. Sözlük kısmında, derlenmiş metinlerden seçilen sözcüklerle sözlük oluşturulmuştur. Anahtar Kelimeler: Yusufeli, Dil, Ağız, Ses Bilgisi, Şekil Bilgisi In this study, the reasons of the changes are attempted to identify by revealing the similar and different aspects of dialect features of Yusufeli (Artvin) and modern standard Turkish.To make this research, various language materials have been collected from central Yusufeli and eighteen villages around before the study by review method. This work consists of 6 sections as "Introduction, Phonetics, Morphology, Conclusion, Text and Dictionary. In the introduction section, the information about the geography and history of Yusufeli, dialect researches in Turkey and works related to Yusufeli dialect is given. In the phonetics and morphology sections, by examining phonetical and morphological features of the region, the characteristics of the speaking language of this region have been revealed. In the conclusion section, the dialect of Yusufeli has been attempted to generalize. In the text section, 30 texts discussed are submitted by transcription symbols. In the dictionary section, a dictionary is created with the words chosen from the texts that have been compiled. Keywords: Yusufeli, Language, Dialect, Phonetics, Morpholog

Acoustic and mechanical properties of luffa fiber-reinforced biocomposites

This chapter presents an overview of acoustic and mechanical behaviors of luffa fiber reinforced biocomposites. A growing number of studies are examining the composites of biodegradable fibers such as flax, hemp, kenaf and luffa due to the adverse effects of chemical materials on nature. The low cost and superior acoustic and acceptable mechanical properties of biocomposites make them very attractive for practical applications such as sound and vibration isolation. However, the acoustic and mechanical characteristics of biocomposites and their dynamic behaviors should be fully determined before considering them for practical applications. In this chapter, acoustic properties, such as sound absorption and transmission loss, and mechanical properties, such as damping and elasticity of luffa fiber reinforced composites, are presented. The variations in acoustic and mechanical properties due to different samples and manufacturing process are explored.WOS:000532438200017Scopus - Affiliation ID: 60105072Book Citation Index- ScienceArticle; Book ChapterOcak2019YÖK - 2018-1

Effectiveness of Schema Therapy on the Treatment of Depressive Disorders: A Meta-Analysis

The effectiveness of schema therapy in the treatment of depressive disorders was examined in this meta-analysis study. As a result of the literature review using various databases, a total of 35 studies which were carried out in 2007-2017 were reached, 7 of which included in this meta-analysis. For these 7 experimental studies, the country (culture), the type of depressive disorder, the number of participants, the number of sessions, the type of session (individual or group), the duration of the session (minute), and the whole session process (week) were determined as hypothetic moderator variables. The results of the analysis using the random effect model showed that schema therapy had a high level of efficacy in the treatment of depressive disorders. It had been determined that none of the hypothetic moderator variables had moderator functions

Preoperative detection of insulinomas: two case reports

This is an Open Access article distributed under the terms of the Creative Commons Attribution Licens

A multi-technique approach to determine temporal and spatial variability of groundwater-stream water exchange

Characterizing the spatio-temporal distribution of groundwater-surface water exchange fluxes is of paramount importance in understanding catchment behavior. A wide range of field-based techniques are available for such characterization. The objective of this study is to quantify the spatio-temporal distribution of the exchange fluxes along the Çakıt stream (Nigde, Turkey) through coupling a set of geophysical techniques and in-stream measurements in a hierarchical manner. First, geological and water quality information were combined at the catchment scale to determine key areas for reach-scale focus. Second, electromagnetic induction (EMI) surveys were conducted along the reach to pinpoint potential groundwater upwelling locations. EMI anomalies guided our focus to a 665 meter-long reach of the stream. Along this selected reach, a fiber-optic distributed temperature sensing (FO-DTS) system was utilized to investigate streambed-temperature profiles at fine spatial and temporal scales. Furthermore, vertical hydraulic gradients and exchange fluxes were investigated using nested piezometers and vertical temperature profiles, respectively, at two potential upwelling locations and a potential downwelling location identified by previous surveys. The results of the study reveal heterogeneity of vertical water-flow components with seasonal variability. The EMI survey was successful in identifying a localized groundwater upwelling location. FO-DTS measurements revealed a warm temperature anomaly during cold air temperature and low streamflow conditions at the same upwelling site. Our point-based methods, namely vertical temperature profiles and vertical hydraulic gradient estimates, however, did not always provide consistent results with each other and with EMI and DTS measurements. This study, therefore, highlights the opportunities and challenges in incorporating multi-scale observations in a hierarchical manner in characterization of the groundwater-surface water exchange processes that are known to be highly heterogeneous in time and space. Overall, a combination of different methods helps to overcome the limitations of each single method and increases confidence in the obtained results

The Effect of Prevention Practices Taken During the Pandemic Process on the Prevalence of Other Respiratory Infections

Purpose: In this study, it is aimed to determine whether there is a change in the frequency of upper respiratory tract and lower respiratory tract infections except for COVID-19 between 2019-2020, and to determine the effect of pandemic measures on this change in case of a change. Materials and Methods: The study is cross-sectional. Research data were collected using a structured questionnaire and the country's internet-based personal health information data (E-Pulse). Results: Based on both the statements of participants and records, it was determined that the number of respiratory tract infections decreased during the pandemic period compared to the pre-pandemic period. Being in crowded environments, doing social activities, complying with social distancing, washing hands, and the presence of other members of the family in a crowded environment had no effect on having respiratory tract infections in 2020. Conclusion: Non-COVID-19 respiratory tract infections decreased during the pandemic period. The measures taken and changing lifestyle are effective in these results. Personal risk perception is important in individual behavior