Toz Metalurjisi İle Üretilen Nb-V Mikroalaşim Çeliğine Vanadyum İlavesinin Mikroyapi Mekaniksel Özellikleri Üzerine Etkisi

Bu çalışmada toz metalurjisi yöntemiyle Fe matris içerisine sabit oranda grafit ve niyobium ilavesinin yanı sıra farklı oranlarda vanadyum elementinin (% Ağırlık olarak 0-0,025-0,05-0,1-0,3-0,5-1-3) katılmasıyla istenilen bileşimde çelik malzeme toz karışım olarak elde edilmiştir. Elde edilen tozlar çekme numunesi şeklinde tasarlanan kalıpta 700 MPa presleme basıncında sıkıştırılarak atmosfer kontrollü tüp fırında argon atmosferinde 1400ͦC’de sinterlenerek çelik üretimi gerçekleştirilmiştir. Farklı V oranlarına sahip Nb-V mikroalaşımlı çelik numunelerin mekanik özellikleri çekme ve mikrosertlik testi ile analiz edilmiştir. Toz metal çeliklerin mikroyapısı optik mikroskop ile karakterize edilmiştir. Sonuçlar % ağırlık olarak % 1 V ilave edilmiş TM çelik numunelerin en yüksek akma ve çekme dayanımına sahip olduğu göstermektedir.  V miktarı %1’dan %3’e çıkması ile akma ve çekme dayanımında azalma gözlenmiştir

Comparison of the diagnoses, the outpatient clinics they visited, and the number of visits of patients with and without a diagnosis of fibromyalgia syndrome: Do patients with fibromyalgia syndrome come to the hospital more often? [Fibromiyalji sendromu tanısı olan ve olmayan hastaların başvurdukları poliklinik bölümleri, başvuru sayıları ve aldıkları tanıların karşılaştırılması: Fibromiyalji sendromu tanısı olan hastalar, hastaneye daha mı sık geliyor?]

Summary Objectives: Fibromyalgia syndrome (FMS) has a wide spectrum of symptoms that includes all body parts. So FMS is a great imitator. This brings to mind the possibility that fibromyalgia patients visit outpatient clinics in many departments more than non-fibromyalgia patients. However, there is not enough data on this subject. This study aims to compare the number of outpatient visits of patients with FMS with those without a diagnosis of FMS and to examine their diagnoses. Methods: The diagnoses of 140 patients (70 with fibromyalgia and 70 controls), and departments of the outpatient clinics they visited were analyzed retrospectively. In the control group, patients who visited the same outpatient clinic with the complaint of knee pain, but who did not have FMS and who had never been diagnosed with FMS before, were recruited as age- and gender-matched. Results: The total number of outpatient clinic visits, as well as the number of visits to physical medicine and rehabilitation, obstetrics and gynecology, general surgery, internal medicine, and psychiatry departments, were significantly higher in fibromyalgia group patients compared to the control group. In addition, the number of diagnoses in the 5th chapter (mental, behavioral, and neurodevelopmental disorders, F01-F99) of International Classification of Diseases-10 was significantly higher in the fibromyalgia group. Conclusion: It should be kept in mind that patients with FMS visit more hospitals and outpatient clinics than other patients. Physicians and patients should be informed about this issue to reduce unnecessary health costs

PERTURBED COMPANION OF OSTROWSKI TYPE INEQUALITY FOR TWICE DIFFERENTIABLE FUNCTIONS

In this paper, some perturbed companion of Ostrowski type integral inequalities for functions whose second derivatives are either bounded or of bounded variation are established