79 research outputs found
Manufacturing automation : metal cutting mechanics, machine tool vibrations, and CNC design / Yusuf Altintas.
No full textengineering bookfair2015Includes bibliographical references and index.xii, 366 pages :"Metal cutting is a widely used method of producing manufactured products. The technology of metal cutting has advanced considerably along with new materials, computers, and sensors. This new edition treats the scientific principles of metal cutting and their practical application to manufacturing problems. It begins with metal cutting mechanics, principles of vibration, and experimental modal analysis applied to solving shop floor problems. Notable is the in-depth coverage of chatter vibrations, a problem experienced daily by manufacturing engineers. The essential topics of programming, design, and automation of CNC (computer numerical control) machine tools, NC (numerical control) programming, and CAD/CAM technology are discussed. The text also covers the selection of drive actuators, feedback sensors, modeling and control of feed drives, the design of real time trajectory generation and interpolation algorithms, and CNC-oriented error analysis in detail. Each chapter includes examples drawn from industry, design projects, and homework problems. This book is ideal for advanced undergraduate and graduate students, as well as practicing engineers"--Provided by publisher
Update: Non-Invasive Positive Pressure Ventilation in Chronic Respiratory Failure Due to COPD
No full textA very unusual iatrogenic tracheal foreign body
No full textAbstractWe present the occurrence of the free distal aspect of a screw which belongs to cervical vertebra implant penetrated the trachea and resulted in tracheal obstruction. This occurrence has not been previously reported in the English literature. This event occurred, four years ago following a cervical vertebra implant surgery for herniated nucleus pulposus. The patient has been suffering from dyspnea after the surgery. Patient had been diagnosed as chronic asthma bronchiale and given asthma medications by different doctors since the operation. The patient presented to our hospital with the same complaints. Her pulmonary function test revealed upper airway obstruction, thereupon we ordered a neck tomography. The tomography showed a foreign body in the trachea of the patient. The implant and the screw were safely removed. The patient’s complaints are recovered after removal. Her pulmonary function test was improved
Non-sleepy obstructive sleep apnoea: to treat or not to treat?
No full textNon-sleepy obstructive sleep apnoea (OSA) is thought to have a prevalence of around 20-25% in industrialised countries. However, the question of whether it should be routinely treated or not is controversial. This review collates the results from recent randomised controlled trials addressing OSA and examines whether treating the condition leads to improvements in quality of life and reduced cardiometabolic dysfunction, comorbidities generally attributed to untreated obstructive sleep apnoea/hypopnoea syndrome
Soluble urokinase-type plasminogen activator receptor is a novel biomarker predicting acute exacerbation in COPD
No full textAziz Gumus,1 Nejat Altintas,2 Halit Cinarka,1 Aynur Kirbas,3 Muge Haziroglu,1 Mevlut Karatas,1 Unal Sahin1 1Department of Pulmonary Medicine, School of Medicine, Recep Tayyip Erdogan University, Rize, Turkey; 2Department of Pulmonary Medicine, School of Medicine, Namik Kemal University, Tekirdag, Turkey; 3Department of Clinical Biochemistry, School of Medicine, Recep Tayyip Erdogan University, Rize, Turkey Background: Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory condition, and progresses with acute exacerbations. (AE). During AE, levels of acute phase reactants such as C-reactive protein (CRP) and inflammatory cells in the circulation increase. Soluble urokinase-type plasminogen activator receptor (suPAR) levels increase in acute viral and bacterial infections and in diseases involving chronic inflammation. The purpose of this study was to investigate the effectiveness of suPAR in predicting diagnosis of AE of COPD (AE-COPD) and response to treatment. Methods: The study population consisted of 43 patients diagnosed with AE-COPD and 30 healthy controls. suPAR, CRP, and fibrinogen levels were measured on the first day of hospitalization and on the seventh day of treatment. Results: We found that fibrinogen (P<0.001), CRP (P<0.001), and suPAR (P<0.001) were significantly higher in patients with AE-COPD than in healthy controls. Fibrinogen (P<0.001), CRP (P=0.001), and suPAR (P<0.001) were significantly decreased by the seventh day of treatment. However, the area under receiver operator characteristic curve showed that suPAR is superior to CRP and fibrinogen in distinguishing AE-COPD. There was a correlation between fibrinogen, CRP, and suPAR. However, only fibrinogen was a powerful predictor of suPAR in multiple linear regression. In multiple logistic regression, only suPAR and fibrinogen were strong predictors of AE-COPD (P=0.002 and P=0.014, respectively). Serum suPAR was negatively correlated with forced expiratory volume in 1 second (r=-478, P=0.001). Conclusion: suPAR is a marker of acute inflammation. It is well correlated with such inflammation markers as CRP and fibrinogen. suPAR can be used as a predictor of AE-COPD and in monitoring response to treatment. Keywords: biomarker, chronic obstructive pulmonary disease, inflammation, suPA
Relationship between Lung Functions and Extent of Emphysema in Patients with Chronic Obstructive Pulmonary Disease
No full textBouwlogistiek 2.0: Een onderzoek naar de toepasbaarheid van innovatieve bouwlogistieke concepten in binnenstedelijke projecten en de voor- en nadelen van deze concepten vanuit een efficiëntie perspectief
No full textEen onderzoek naar de toepasbaarheid van innovatieve bouwlogistieke concepten in binnenstedelijke projecten en de voor- en nadelen van deze concepten vanuit een efficiëntie perspectief.Design & Construction ManagementReal Estate & HousingArchitectur
Topology of soft cone metric spaces
No full textInternational Conference on Functional Analysis in Interdisciplinary Applications (FAIA) -- OCT 02-05, 2017 -- Astana, KAZAKHSTANIn Simsek's paper it was introduced a concept of soft cone metric space via soft elements and some fixed point theorems in soft cone metric space were provided. In this work, we examine topological structures such as open ball, soft neighbourhood and soft open set in soft metric spaces and their some properties, and prove that every soft cone metric space under some condition is a soft topological space according to elementary operations on soft sets.Kyrgyz Turkish Manas University [KTMUBAP-2016.FBE.12]This work is supported by Kyrgyz Turkish Manas University in the framework of Scientific Research Projects (KTMUBAP-2016.FBE.12)
Virtual High Performance Machining
No full textAbstractThe goal of current research is to develop digital models of all steps in the manufacturing of parts. This paper presents an overview of digital machining of parts in virtual environment. It is based on research and development of digital models in machining parts. The tool – part intersection along the tool path is evaluated at discrete steps, which are then used to calculate chip area, cutting load, torque-power-energy drawn from the machine and the detection of chatter occurrence. The dynamics of the CNC system are incorporated to the digital model in order to estimate the true tangential feed and machining cycle time. The tangential feeds are automatically optimized by considering the tool breakage, spindle torque-power, and tool deflection limits set by the process planner. The virtual machining system can be used independently or as an integral part of CAM systems such as Siemens NX. Sample applications of the virtual high performance machining system in aerospace industry are presented
In Search Of New Definition In The Postmodern Era: Graphic Designer As An Author
No full textModernizmin zorunlu getirisi olarak metnin ve içeriğin üreticisi olmaktan çok, görsel iletişim aracısı konumunda durmuş olan grafik tasarımcılar, 1970’li yıllara gelindiğinde içeriğin şeffaf iletkeni görevini üstelenen modernist tasarım anlayışının reddiGraphic designers, who have stood in the position of visual communication mediator rather than being the producer of text and content as a necessary reTurkishn of modernism, started to Turkishn towards design tendencies independent of the customer and pe
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