Ötektik kaynağı ve ötektik üzeri sert lehim uygulanan al-cu boru bağlantılarının mekanik özellik ve mikroyapılarının incelenmesi

Soğutma çevriminde en önemli faktörlerden biri olan sızdırmazlığın sağlanması için kuvvetli alüminyum bakır bağlantılarının oluşturulması gerekmektedir. Titreşimli bir ortamda çalışan bu bağlantılar aynı zamanda uzun süreli kullanımlar sonucunda meydana gelebilecek sızıntılardan kaynaklı gaz kaçaklarına engel olmalıdır. Bu çalışmada ötektik kaynağı ve ötektik üzeri sert lehim yöntemi ile birleştirilmiş alüminyum ve bakır borular incelenmiş, bağlantı mukavemetinin artırılması ve sızdırmazlığın sağlaması için bu iki yöntem tek bir bağlantı noktasına beraberce uygulanmıştır. Tüm numune çeşitlerine patlatma testi, çekme testi, sızdırmazlık testi uygulanmış olup, taramalı elektron mikroskobu altında bağlantı ara yüzeylerindeki mikroyapıları incelenmiştir. Yapılan deneysel çalışmalar sonucunda ötektik üzeri sert lehim bağlantısından kesme gerilmesinin diğer bağlantıya göre %15.32 daha yüksek sonuç elde edilmiştir. Ötektik üzeri sert lehim bağlantısı ile bağlanan numunelerin, ötektik bağlantıya göre %4,76 oranında basınca daha dayanıklı olduğu görülmüştür. Sızdırmazlık testleri sonucunda ise % 1 oranında olan sızdırmazlığın % 1 den % 0 oranına düşürüldüğü tespit edilmiştir.In order to ensure tightness, which is one of the most important factors in the refrigeration cycle, strong aluminum-copper connections must be formed. These connections, which operate in a vibrating environment, should also prevent gas leaks caused by leaks that may occur as a result of long-term use. In this study, aluminum and copper pipes connected by eutectic and brazing method were examined, and these two methods were applied together to a single connection point in order to increase the joint strength and provide sealing. Explosion test, tensile test and leak test were applied to all sample types, and their microstructures at the junction interfaces were examined under scanning electron microscope. As a result of the experimental studies, the shear stress of the eutectic brazed joint was 15.32% higher than the other connection. It has been observed that the specimens connected with the eutectic braze connection are more resistant to pressure by 4.76% than the eutectic joint. As a result of the tightness tests, it was determined that the tightness, which was 1%, was reduced from 1% to 0%

Employee benefit status from e-employee service

The internet is the one of the most important global network and information source in information age. The internet has changed employee’s life enormously. The purpose of this study is to clarify the benefitting situations of employees from e-employee services. For this purpose, a 20-item data collection tool, based on the e-employee services put forward by the Information Council Turkey was developed. Maintained measurement tool was applied on 515 employees residing different regions and provinces of Turkey in the 2014 academic year. As a result, it was observed that employees benefitted from social, health and education oriented services of e-employee at “medium frequency”, whereas they “rarely” benefitted from the economic-oriented services of e-employee. It was found that women used e-employee services more than men. 30-year of age and younger people used e-employee services more often than older people. In addition, those who have higher incomes use e-employee services more frequently than those who have medium or low incomes. Those working in education and finance sectors benefit from the e-employee services more often than those in other sectors

Lacrimal gland tumors in Turkey: types, frequency, and outcomes.

AIM: To evaluate the clinical, radiological, and treatment features of lacrimal gland tumors. METHODS: Retrospective review of 99 eyes of 92 patients with lacrimal gland tumors diagnosed and managed in a single institution between January 1999 and March 2017. Clinical and radiological features, histopathology, treatment methods, and prognosis were evaluated. RESULTS: The mean patient age was 40.3 (range: 7-80)y. The diagnosis was made histopathologically in 91 (91.9%) tumors and on a clinical and radiological basis in 8 (8.1%) tumors. Final diagnoses included idiopathic orbital inflammation (pseudotumor) in 46 (46.5%) lesions, pleomorphic adenoma in 14 (14.1%), adenoid cystic carcinoma in 12 (12.1%), granulomatous inflammation in 10 (10.1%), lymphoma in 5 (5.0%), benign reactive lymphoid hyperplasia in 3 (3.0%), dacryops in 3 (3.0%), carcinoma ex pleomorphic adenoma in 2 (2.0%), adenocarcinoma in 1 (1.0%), dermoid cyst in 1 (1.0%), cavernous hemangioma in 1 (1.0%), and leukemic infiltration in 1 (1.0%). Non-epithelial tumors comprised 64.6% ( CONCLUSION: Overall, 65% of lacrimal gland tumors were of non-epithelial origin and 32% of epithelial origin. By histopathology and clinical evaluation, 79% of lacrimal gland tumors were benign. The most common lacrimal gland tumors include idiopathic orbital inflammation (46.5%), epithelial (32.3%), and lymphoproliferative (8.1%) lesions

A study on technology management process: the parts and components suppliers in the Turkish automotive industry

This paper summarizes part of an empirical study on technology management process in the Turkish automotive parts and components industry. In this study, technology management practices in the Turkish automotive parts and components suppliers' sector are described and evaluated. Practices, techniques, and approaches are proposed to improve the level of technology management so as to turn technology into a competitive weapon. The investigation is organized within the framework of a process model for technology management that consists of technology identification, selection, acquisition, exploitation, protection, and abandonment. A comprehensive questionnaire addressing all phases of this process is developed and the results of 21 companies are presented

Clinical value of neutrophil to lymphocyte ratio in the region of lower extremity deep venous thrombosis

Objectives. Many studies have demonstrated a significant association between cardiovascular disease andneutrophil to lymphocyte ratio (NLR). To our knowledge, no study has been reported in patients with deepvenous thrombosis (DVT) which affecting proximal or distal leg. In this study we analyzed proximal and distalDVT according to the NLR. Methods. This retrospective study was obtained from patients’ records of a tertiaryuniversity hospital between May 2011 to January 2014. A total of 57 patients with the diagnosis of acute primaryDVT and 30 patients as control group included in the study. All of them were confirmed with lower extremityvenous duplex examinations. Of these, 37 examinations with the diagnosis of proximal DVT were comparedto 20 examinations with distal DVT. The groups compared regarding to complete blood counter values. Results.Mean eosinophil level was higher in the distal DVT group (0.28±0.24 vs. 0.12±0.01, p=0.001), whereas medianNLR were higher in the proximal DVT group than the distal DVT group (3.5 [0.5-4.3] vs. 2.3 [1.2-9.7],respectively; p=0.002). In addition, median NLR, leukocyte and neutrophil counts were statistically lower inthe control group than the others (p=0.014, p=0.027 and p=0.004, respectively). Conclusion. NLR, aninexpensive and easily measurable laboratory variable, was independently and significantly associated withthe presence and severity of DVT, especially acute proximal DV

Non-opioid Analgesics and the Endocannabinoid System

Non-steroidal anti-inflammatory drugs produce antinociceptive effects mainly through peripheral cyclooxygenase inhibition. In opposition to the classical non-steroidal anti-inflammatory drugs, paracetamol and dipyrone exert weak anti-inflammatory activity, their antinociceptive effects appearing to be mostly due to mechanisms other than peripheral cyclooxygenase inhibition. In this review, we classify classical non-steroidal anti-inflammatory drugs, paracetamol and dipyrone as “non-opioid analgesics” and discuss the mechanisms mediating participation of the endocannabinoid system in their antinociceptive effects. Non-opioid analgesics and their metabolites may activate cannabinoid receptors, as well as elevate endocannabinoid levels through different mechanisms: reduction of endocannabinoid degradation via fatty acid amide hydrolase and/or cyclooxygenase-2 inhibition, mobilization of arachidonic acid for the biosynthesis of endocannabinoids due to cyclooxygenase inhibition, inhibition of endocannabinoid cellular uptake directly or through the inhibition of nitric oxide synthase production, and induction of endocannabinoid release

Unilateral primary adrenal B-cell lymphoma clinically mimicking chronic gastritis

Background: Primary adrenal lymphomas are a very rare type of extranodal lymphoma, and they usually are found bilaterally. Symptoms of the disease are variable and depend on the type of lymphoma and/or presence of adrenal insufficiency. Magnetic resonance imaging is the best radiologic modality for differentiating lymphomas from other adrenal malignancies; however, histopathology is considered as the gold standard method for diagnosing extranodal lymphomas. Case Report: We present a case of unilateral adrenal lymphoma that was initially diagnosed as an infectious disease and chronic gastritis, based on clinical and laboratory findings. Ultrasonography detected an adrenal mass, and magnetic resonance imaging excluded common lesions of the adrenal gland and showed lymphadenopathy around the major vessels of the abdomen. A percutaneous biopsy of the mass and bone marrow biopsy confirmed the diagnosis of primary adrenal lymphoma withoutbone marrow metastasis. Conclusions: Extranodal lymphomas can occur in almost every organ, and if nonspecific clinical findings are combined with the presence of a solid organ mass, lymphoma should be included in the differential diagnosi

Explosive Behavior in COVID-19 and Policy Responses: Lessons Learned for Public Health Management

Since the first case of COVID-19 in Turkey, there has been a lingering question as elsewhere in the world: ‘‘When will or should the government impose severe restrictions to protect public health?’’ From a public health perspective, there is value in developing a model to support proactive implementation of social policies. This study aimed to show the benefits of using a novel econometric test (the Generalized Supremum Augmented Dickey-Fuller Test) to detect explosive behavior (bubbles) in Turkey’s daily COVID-19 cases and deaths. Results from the analysis demonstrated a link between identified explosive episodes and critical public health decisions, especially in the case of daily new deaths. They also showed a negative relationship between the formation of exuberant behavior during the pandemic and the vaccination rate. Public health policymakers can incorporate this method into their arsenal to evaluate the overall health situation in combating the pandemic and respond accordingly. Furthermore, among the lessons learned from the Turkish experience is the importance of having a coronavirus scientific advisory board in the decision-making process and the ability to promptly implement policy measures

Lamellar Keratoplasty Using Microkeratome-Assisted Anterior Lamellar Graft in the Management of Deep Limbal Dermoid: A Case Report

Limbal dermoid is a congenital benign tumor of the limbus which is often managed by surgery if necessary. In dermoid lesions involving the deep stroma, tumor excision and reconstruction of the anterior segment with amniotic membrane transplantation or keratoplasty may be required. Herein, we present a case of deep limbal dermoid treated with surgical resection and lamellar keratoplasty using microkeratome-assisted anterior lamellar graft

Surface characteristics of scots pine wood heated at high temperatures after weathering

This study was conducted to investigate some surface properties of wood specimens of heat treated Scots pine (Pinus sylvestris L.) after weathering such as surface hardness, surface roughness, gloss, and color changes. Heat treatment of Scots pine wood was carried out by hot air in an oven for 1, 2, and 3 hours at 210, 220, and 230°C. The results showed that generally surface hardness losses of heat treated Scots pine wood were lower than that of un-heated Scots pine wood after weathering. Heat treated Scots pine wood gave smooth surface after weathering. Except for heat treatment at 230°C for 1 and 2 hours, heat treatment resulted in better glossiness compared to un-heated Scots pine wood after weathering. According to the test results, while heat treated Scots pine wood become lighter after weathering, un-heated wood become darken after weathering. In general, heat treated wood surface to become reddish and yellowish after weathering.No sponso