Effective Mass Dirac-Morse Problem with any kappa-value

The Dirac-Morse problem are investigated within the framework of an approximation to the term proportional to $1/r^2$ in the view of the position-dependent mass formalism. The energy eigenvalues and corresponding wave functions are obtained by using the parametric generalization of the Nikiforov-Uvarov method for any $\kappa$-value. It is also studied the approximate energy eigenvalues, and corresponding wave functions in the case of the constant-mass for pseudospin, and spin cases, respectively.Comment: 12 page

Coupled squeeze film analysis by Reissner-Mindlin plate elements

Squeeze film damping effects naturally occur if structures are subjected to loading situations such that a very thin film of fluid is trapped within structural joints, interfaces, etc. An accurate estimate of squeeze film effects is important to predict the performance of dynamic structures. This paper presents a finite element solution to the coupled fluid-structure problem of squeeze film dampers. The squeeze film is governed by the linearized isothermal Reynolds equation, which is known from lubrication theory. The structure which is modeled using Reissner-Mindlin plate theory is discretized by four-noded two-dimensional shear deformable isoparametric plate elements. The coupled finite element formulation is derived and an alternative solution to obtain damped eigenvalues and eigenvectors is presented. The coupling between fluid and structure is handled by considering the pressure forces and structural surface velocities on the boundaries. The effects of the driving parameters on the frequency response functions are investigated. It was found that the ambient pressure has no significant effect on the frequency responses, unlike on the damping force of dynamical MEMS systems. The results obtained from the presented model are compared with the experimental and analytical results available in the literature and a very good agreement is found. © The Author(s) 2011

Maksiller darlığı ve şiddetli çapraşıklığı olan hastanın cerrahi destekli üst çene genişletme tedavisi (SARME) : Olgu sunumu

The aim of this case report is to present an adult patient with a narrow maxilla and severe crowding treated with the help of surgically assisted maxillary expansion. A 17-year-old male patient referred to our clinic for the primary complaint of unaesthetic smile and severe upper anterior crowding. Extraoral examination revealed convex profile. Intraoral examination revealed narrow maxilla, posterior cross bite, V shaped upper arch form and severe crowding. The treatment was initiated with corticotomy operation for maxillary expansion. A tooth-borne acyrilic cap splint appliance with Hyrax screw was then fixed for distraction. Distraction protocol was started 7 days postoperatively by 2 turns a day (0.5 mm/ day). The distractor was left in place for an additional 3 months for stabilization and reossification after the required space had been achieved. Orthodontic fixed treatment started within 4 weeks after removal of the appliance. Computed tomography scans of the patient were performed to help the planning of the treatment 1 month before the orthodontic treatment. The data reconstructed using the Mimics software (Materialise, Leuven, Belgium) for surgical planning. Surgically assisted maxillary expansion is a successful treatment modality for adult patients requiring palatal expansion. The total treatment period was 24 months and the results were acceptable.Bu olgu sunumunun amacı dar üst çeneye ve şiddetli yer darlığına sahip yetişkinhastanın cerrahi destekli üst çene genişletilmesi yardımı ile tedavisinin sunulmasıdır.17 yaşında erkek hasta estetik olmayan gülümseme ve şiddetli üst ön çapraşıklık ilekliniğimize başvurdu. Ağız dışı incelemede konvex bir profil olduğu gözlendi. Ağıziçi incelemede dar bir maksilla, arka bölgede çapraz kapanış, V şekilli üst ark formuve şiddetli çapraşıklık gözlendi. Tedavi cerrahi operasyon ile başladı. Hyrax vidaiçeren diş destekli akrilik cap splint distraksiyon apareyi uygulandı. Distraksiyonprotokolüne operasyon sonrası 7 günlük bekleme sonrası günde 2 tur (0.5mm/gün) olacak şekilde başlandı. Gerekli yer elde edildikten sonra stabilizasyon ve yenikemik oluşumunun beklenmesi amacıyla distraktör operasyon sonrası 3 ay ağızdabırakıldı. Apareyin çıkartılmasını takiben 4 hafta sonra sabit tedaviye başlandı.Tedavi planlaması amacıyla hastanın bilgisayarlı tomografi görüntüleri tedaviden 1ay önce alındı. Analiz amaçlı, veriler Mimics (Materialise, Leuven, Belgium) yazılımıile yeniden oluşturuldu. Cerrahi destekli üst çene genişletme tedavisi palatalekspansiyon ihtiyacı olan yetişkin hastalarda başarılı bir tedavi yöntemidir. Toplamtedavi 24 ay sürmüştür ve kabul edilebilir sonuçlar elde edilmiştir

Embolization of dural carotid-cavernous fistulas via the thrombosed superior ophthalmic vein

Purpose: To present the authors' experience treating dural carotid-cavernous sinus fistulas (CCF) with retrograde embolization via the thrombosed superior ophthalmic vein (SOV). Methods: The medical records of 4 patients with dural CCFs treated via the thrombosed SOV were reviewed. All procedures were performed unilaterally in the interventional radiology unit with the administration of general anesthesia. The SOV was exposed via an eyelid crease incision, and then an angiocatheter was inserted in the vein and advanced through the segment with thrombosis to the cavernous sinus, where embolizing agents were deposited. After the procedure, the patients were followed up and evaluated clinically. Results: Three patients had unilateral CCFs, and 1 had a bilateral CCF (3 women and 1 man; age range, 58-68 years). The CCFs were Barrow type B (n = 2) and Barrow type D (n = 2). All patients had severe venous congestive orbital symptoms, chorioretinopathy, increased intraocular pressure, and visual loss. In all cases, the SOV appeared as a pale, thin, tortuous vessel adherent to the surrounding tissues during the surgical procedure. In 3 patients, the cavernous sinus was successfully embolized, and all symptoms were completely resolved without recurrence during follow up (3, 15, and 24 months). In the patient in whom the SOV could not be catheterized, the symptoms regressed slowly, but visual acuity remained unchanged during follow up (64 months). Conclusions: Dural CCFs can be successfully treated through the SOV, even when the vein is thrombosed. Identification and catheterization of the thrombosed SOV may be difficult because of the tiny and fibrotic structure of the vein

Effects of mental status, mobility and depression level on activities of daily living in hemiparetic patients

Purpose: The aim of this study was to describe the relation between functional status, mobility status and depression level in hemiparethic patients who suffered from cerebro-vascular accident. Material and methods: Seventeen hemiparethic patients (ten male, seven female) with a mean age of 56,64±14,33 years were included in this study. Ten patients were left and the other seven were right hemiparethic. All the cases were evaluated using Functional Independence Measure (FIM), Rivermead Mobility Index (RMI), Mini Mental State Exam (MMSE) and Beck Depression Scale (BDS). All of the tests were applied once by a physical therapist. The data, which was obtained from this study, was calculated using SPSS for Windows statistical program. Results: The results of 17 hemiparethic patients showed that there was a significant correlation between FIM and RMI (p0.05). Conclusion: Cognitive functions, depression level and mobility status effect each other in patients with neuromuscular dysfunction. That's why, physical therapists should evaluate parameters such as mental status, depression level, mobility, activities of daily living in order to provide the suitable treatment program

Comparison of fluoro and cine coronary angiography: Balancing acceptable outcomes with a reduction in radiation dose

WOS: 000362273800008PubMed ID: 25840403Use of last fluoro hold (LFH) mode in fluoroscopy, which enables the last live image to be saved and displayed, could reduce radiation during percutaneous coronary intervention when compared with cine mode. No previous study compared coronary angiography radiation doses and image quality between LFH and conventional cine mode techniques. Methods. We compared cumulative dose-area product (DAP), cumulative air kerma, fluoroscopy time, contrast use, interobserver variability of visual assessment between LFH angiography, and conventional cine angiography techniques. Forty-six patients were prospectively enrolled into the LFH group and 82 patients into the cine angiography group according to operator decision. Results. Mean cumulative DAP was higher in the cine group vs the LFH group (50058.98 +/- 53542.71 mGy.cm(2) vs 11349.2 +/- 8796.46 mGy.cm(2); P<.001). Mean fluoroscopy times were higher in the cine group vs the LFH group (3.87 +/- 5.08 minutes vs 1.66 +/- 1.51 minutes; P<.01). Mean contrast use was higher in the cine group vs the LFH group (112.07 +/- 43.79 cc vs 88.15 +/- 23.84 cc; P<.001). Mean value of Crombach's alpha was not statistically different between visual estimates of three operators between cine and LFH angiography groups (0.66680 +/- 0.19309 vs 0.54193 +/- 0.31046; P=.20). Conclusion. Radiation doses, contrast use, and fluoroscopy times are lower in fluoroscopic LFH angiography vs cine angiography. Interclass variability of visual stenosis estimation between three operators was not different between cine and LFH groups. Fluoroscopic LFH images conventionally have inferior diagnostic quality when compared with cine coronary angiography, but with new angiographic systems with improved LFH image quality, these images may be adequate for diagnostic coronary angiography