INVESTIGATION OF EFFICIENCY OF R717 REFRIGERANT SINGLE STAGE COOLING SYSTEM AND R717/R744 REFRIGERANT CASCADE COOLING SYSTEM

This study is an adaptation of ammonia cascade cooling systems using carbon dioxide on ice cream production machinesand includes thermodynamic analysis of R717/R744 cascade refrigeration system with R717 refrigerant single-stagerefrigeration system and investigation of its efficiency. As a result of the analyses, the COP value of the single-stage systemwas 3.67, the Carnot efficiency was 0.57, the second law efficiency was 0.19 and the power required to operate thecompressor was 27.55 kW. In the cascade cooling system, the COP value was 4.46, the Carnot efficiency 0.59 and thecompressor power 22.7 kW in the high-temperature part, while the COP value was measured as 14.65, the Carnot efficiency0.58 and the compressor power 6.4 kW in the low-temperature part. For the whole cascade system, the COP 3.24 and thesecond law efficiency were found to be 0.43. When the results were compared, it was concluded that although the COPvalue of the cascade cooling system was 0.43 points lower than the single-stage ammonia system, when our country'sclimate conditions and the thermophysical properties carbon dioxide gas were considered together, one of the most suitabledesigns was the cascade cooling system

Post traumatic stress and anxiety in patients with acute coronary syndrome

Background: Acute coronary syndrome (ACS) is one of the diseases in which psychiatric complications develop, with initiation of treatment, and having cardiac, patient-specific behavioral problems. The aim of this study was to investigate symptoms of posttraumatic stress disorder (PTSD) and anxiety in patients that experience ACS. The relationship between PTSD symptoms and anxiety and the relationship between these psychological conditions and certain personal characteristics were reviewed. Methods: In this study, which was prospective and descriptive, 215 patients who experienced ACS were evaluated in the first month after ACS. The data in the research was collected using the Patient Identification Form, Posttraumatic Stress Disorder Symptoms Scale Self-Report (PSS-SR) and Spielberg State-Trait Anxiety Inventory (STAI-T). Results: 70.2% of the patients were male and 31.2% were retired. The PSS-SR mean score was 28.40 ± 10.42 and the mean STAI-T score was 57.65 ± 12:37. Between the STAI and PSS-SR there was a statistically significant positive correlation. In women, workers, grade 1 obese patients, those using alcohol, and those with chronic disease the average PSS-SR scores were significantly higher. Housewives, illiterate individuals and 1st degree obese patients had a higher average score of anxiety, as well as patients with chronic diseases and higher alcohol use.

Improving the zT value of thermoelectrics by nanostructuring: Tuning the nanoparticle morphology of Sb2Te3 by using ionic liquids

A systematic study on the microwave-assisted thermolysis of the single source precursor (Et2Sb)2Te (1) in different asymmetric 1-alkyl-3-methylimidazolium- and symmetric 1,3-dialkylimidazolium-based ionic liquids (ILs) reveals the distinctive role of both the anion and the cation in tuning the morphology and microstructure of the resulting Sb2Te3 nanoparticles as evidenced by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and X-ray photoelectron spectroscopy (XPS). A comparison of the electrical and thermal conductivities as well as the Seebeck coefficient of the Sb2Te3 nanoparticles obtained from different ILs reveals the strong influence of the specific IL, from which C4mimI was identified as the best solvent, on the thermoelectric properties of as-prepared nanosized Sb2Te3. This work provides design guidelines for ILs, which allow the synthesis of nanostructured thermoelectrics with improved performances

Determination of bisphenol a and phthalate levels in wastewater samples

Objective: The use of endocrine-disrupting chemicals (EDCs) such as bisphenol A (BPA) in plastics manufacturing, agriculture, livestock, and paint manufacturing increas daily. The water treated in wastewater treatment plants is used in many areas such as irrigation of parks and gardens, and reinforcement of underground water resources. However, whether the treatment process eliminates EDCs in wastewater is not exactly known, and determining this as well as the amounts of these chemicals in treated water are important in terms of protecting the environment and human health. The aim of the study was to determine BPA and phthalate concentrations in the influent and effluent flow samples obtained from wastewater treatment plants. Materials and Methods: BPA and phthalate concentrations were measured in influent and effluent flow samples using the enzyme- linked immunosorbent assay (ELISA) method. BPA and phthalate measurements were performed as competitive measurements of BPA and total phthalates in samples using specific monoclonal antibodies. Results: BPA and phthalate levels were measured respectively as 7.69 μg/L and 78.27 μg/L in the influent water samples and 3.17 μg/L and 25.56 μg/L in the effluent water samples. The concentration of BPA and phthalates in the effluent samples decreased significantly compared to the influent water samples. Conclusion: This study is believed to shed light on the importance of monitoring BPA and phthalate concentrations in wastewater treatment plants and inspections for detecting other EDCs in wastewater

The effect of different storage conditions on the migration of chemicals from polyethylene terephthalate and polycarbonate bottles to water

Objective: Polyethylene terephthalate (PET) and polycarbonate (PC) bottles have been used widely in the last years for the consumption of water and the increased use of these chemicals has raised many concerns regarding their adverse effects on health. Phthalates and bisphenol A (BPA) are the main endocrine disrupting chemicals (EDCs) that can migrate from these plastics into potable water. Materials and Methods: The concentrations of phthalate and BPA were measured in water samples that were stored in PET and PC bottles at different storage conditions. The method of ELISA was used for the determination of phthalate and BPA levels. A standard curve is obtained from the standards prepared at known concentrations of phthalate, BPA, according to their absorbance at 450 nm. The BPA levels of the samples were obtained through the calculation of the absorbance values acquired using the standard curve. Results: Different storage and heating processes applied on the samples significantly increased the levels of BPA and phthalate. One year of storage led to a statistically significant increase in phthalate levels when compared to the control group. Both BPA and phthalate levels detected in the water samples were higher than the control group depending on the storage conditions including exposure to high temperatures, sunlight and outdoor conditions. Conclusion: Our results indicate the necessity to establish the environmental conditions that must be ensured during the production, transportation and storage processes of the bottles, on a legal basis with legal regulations

WATSON SYNDROME

Watson sendromu, café-au-lait lekeleri, pulmoner stenoz, mental retardasyon, boy kısalığıile karakterizedir. Bu makalede, moleküler temeli henüz tartışmalı olan ve seyrek görülen bubirlikteliği hatırlatmak amacıyla Watson sendromlu 13 yaşında bir kız olgu sunuldu.Watson syndrome is characterized by café-au-lait spots, pulmonary valvular stenosis,mental retardation and short stature. In this report, we present a thirteen-year-old girl withWatson syndrome to remind this disease which is seldom encountered and the molecularbasis is still controversial

Investigation of pilot scale manufacturing of polysulfone (PSf) membranes by wet phase inversion method

Membranes are used as a support layer for the fabrication of thin film composite membranes. Sup- port layer properties can affect many performance parameters of TFC membranes such as flux, rejection, morphology and stability against pressure. Although studies in lab scale fabrication exist, investigation the pilot scale polysulfone membrane fabrication has not been done. In this study, opti- mization of polysulfone support membranes fabrication was conducted in pilot scale. Coagulation bath temperature; casting speed and solution content were selected as main parameters for the opti- mization. Membrane surface properties were investigated in details with SEM and pore size dis- tribution. Membrane performance were determined with permeability experiments. Differences in pilot scale and lab scale membrane manufacturing were observed and compared with literature. On the contrary to literature it was found that, coagulation bath temperature has exact opposite effect in pilot scale membrane formation compared to lab scale studies. 10°C drop (from 25°C to 15°C) in coagulation bath temperature decreased mean pore size of membranes from 27 nm to 8 nm and per- meability from 464 l/m2h to 100 l/m2h while everything else was kept constant

The frequency of Duchenne muscular dystrophy/Becker muscular dystrophy and Pompe disease in children with isolated transaminase elevation: results from the observational VICTORIA study

IntroductionElevated transaminases and/or creatine phosphokinase can indicate underlying muscle disease. Therefore, this study aims to determine the frequency of Duchenne muscular dystrophy/Becker muscular dystrophy (DMD/BMD) in male children and Pompe disease (PD) in male and female children with isolated hypertransaminasemia.MethodsThis multi-center, prospective study enrolled patients aged 3–216 months with serum alanine transaminase (ALT) and/or aspartate transaminase (AST) levels >2× the upper limit of normal (ULN) for ≥3 months. Patients with a known history of liver or muscle disease or physical examination findings suggestive of liver disease were excluded. Patients were screened for creatinine phosphokinase (CPK) levels, and molecular genetic tests for DMD/BMD in male patients and enzyme analysis for PD in male and female patients with elevated CPK levels were performed. Genetic analyses confirmed PD. Demographic, clinical, and laboratory characteristics of the patients were analyzed.ResultsOverall, 589 patients [66.8% male, mean age of 63.4 months (standard deviation: 60.5)] were included. In total, 251 patients (188 male and 63 female) had CPK levels above the ULN. Of the patients assessed, 47% (85/182) of male patients were diagnosed with DMD/BMD and 1% (3/228) of male and female patients were diagnosed with PD. The median ALT, AST, and CPK levels were statistically significantly higher, and the questioned neurological symptoms and previously unnoticed examination findings were more common in DMD/BMD patients than those without DMD/BMD or PD (p < 0.001).DiscussionQuestioning neurological symptoms, conducting a complete physical examination, and testing for CPK levels in patients with isolated hypertransaminasemia will prevent costly and time-consuming investigations for liver diseases and will lead to the diagnosis of occult neuromuscular diseases. Trial RegistrationClinicaltrials.gov NCT04120168

Comparing Elif Şafak’s Novel “Aşk” With Ahmet Ümit’s “Bab-I Esrar”

Bu çalışmamızda Elif Şafak’ın Aşk romanı ile Ahmet Ümit’in Bab-ı Esrar romanının, esere bağlı inceleme metoduna bağlı olarak, mukayesesinin yapılması amaç edinilmiştir. Herhangi bir edebiyatın başka hiçbir edebiyattan etkilenmeden gelişip geleceğe taşınması mümkün değildir. Türk Edebiyatı da gerek Doğu edebiyatından gerekse Batı edebiyatından etkilenerek gelişmiş ve külliyatını oluşturmuştur. XIX. yüzyıldan sonra önemi anlaşılan, örnekleri çoğalan mukayeseli edebiyat; farklı dönemlerde ya da aynı dönemde yazılmış, farklı milletlerin ya da aynı milletin ürünü olan iki eseri çeşitli yönlerden karşılaştırarak bu eserlerin benzer ve farklı yönlerini belirlemektir. Ancak mukayese esnasında bir eserin diğerinden üstün olduğunu ispatlamaya çalışmak mukayeseli edebiyatın özüne aykırı bir davranıştır. Çalışmamıza esas olan her iki eser incelenirken bunların birbirleriyle mevcut olan benzerlik ve farklılıkları üzerinde durulmuş, tarihi bir gerçeklik olan Mevlâna ile Şems-i Tebrizi’nin ilişkisini kendi itibari dünyalarının özgürlüğünde nasıl kurguladıkları ve bunu yaparken gerçeğe bağlı kalıp kalmadıkları dikkate alınmıştır. Bu doğrultuda metinler esas alınarak çalışılmıştır. Bu çalışmanın amacı; aynı kültürel çevrenin içerisinde yetişmiş iki yazarın aynı konuyu farklı biçimlerde ele almasını inceleyip, bu eserlerin mukayesesini yaparak mukayeseli edebiyat alanına hizmet etmektir. Yapılan bu çalışmalar neticesinde, farklı dillerde ve farklı zaman diliminde yazılmış olan iki edebî eserin mukayese edilebileceği ve bu mukayese sonucunda aynı dönemde yaşamış ve az çok aynı kültürün etkisinde kalmış, ancak farklı dillerde eser vermiş iki sanatçının aynı konuyu farklı şekillerde ele almasına rağmen benzer ve farklı yönlerinin olabileceği yargısına ulaşılmıştır.In our study, it is aimed to compare Elif Şafak’s novel Aşk to Ahmet Ümit’s novel Bab-ı Esrar with inspection method which depends on the work. It İs not possible that any literature developin moving forward future without being affected any literature. Turkish literature is also developed and formed its corpus influenced by both Western literature from Eastern literature. The comparative literature understood its importance after 19th century and increased numbers of samples; written in a different time or the same period, two works of different nationalities or of the same nation of the product to determine the different aspects of this work by comparing the various aspects. Both of works which are essential to our work when examining their work has focused on the similarities and differences that exist with each other, a historical reality that Mevlâna with Şems-i Tebrizi’s correlating how they construct the freedom of their reputation in the world and is considered they remain connected to the actual doing it. In this regard it has been studied on the basis of texts. The aim of this study was grown in the same two authors examine the cultural environment to address the same issues in different ways, making the comparison of the works of comparative literature it is to serve. As the result of these studies done two literary works compared to written in different languages and in different time zones and the comparison results experienced during the same period and have stayed more or less the same culture’s influence, however, they gave the work in different languages, both artists, despite the same issues to deal with in different ways, similarities could be reache