Certifying Stability and Performance of Uncertain Differential-Algebraic Systems: A Dissipativity Framework

This paper presents a novel framework for characterizing dissipativity of uncertain dynamical systems subject to algebraic constraints. The main results provide sufficient conditions for dissipativity when uncertainties are characterized by integral quadratic constraints. For polynomial or linear dynamics, these conditions can be efficiently verified through sum-of-squares or semidefinite programming. The practical impact of this work is illustrated through a case study that examines performance of the IEEE 39-bus power network with uncertainties used to model a set of potential line failures

Evaluation of various antibiotic treatments in calves with infectious bovine keratoconjunctivitis

The purpose of this study was to determine whether subconjunctival administration of enrofloxacin could ameliorate a herd outbreak of infectious bovine keratoconjunctivitis (IBK) and to compare the efficacy of this regimen with the efficacy of subconjunctival administration of a combination of penicillin+streptomycin

Counting Larvae in a Farmer's Ear: 23

Aural myiasis can be defined as fly larvae feeding on the host's ear. It is a rare condition and occurs mostly in children and the mentally retarded adults. We present a 40-year-old, mentally healthy, farmer with aural myiasis. Clinical examination revealed live maggots filling the left external ear canal (EAC). Twenty-three live maggots were removed from the EAC and the middle ear (ME) with alligator forceps and suction-irrigation. The maggots were classified as Wohlfahrtia magnifica. Successful treatment is achieved by direct removal of the maggots and application of preventive methods

Grouping of N−1N-1 Contingencies for Controller Synthesis: A Study for Power Line Failures

The problem of maintaining power system stability and performance after the failure of any single line in a power system (an “$N-1$ contingency”) is investigated. Due to the large number of possible $N-1$ contingencies for a power network, it is impractical to optimize controller parameters for each possible contingency a priori. A method to partition a set of contingencies into groups of contingencies that are similar to each other from a control perspective is presented. Design of a single controller for each group, rather than for each contingency, provides a computationally tractable method for maintaining stability and performance after element failures. The choice of number of groups tunes a trade-off between computation time and controller performance for a given set of contingencies. Results are simulated on the IEEE 39-bus and 68-bus systems, illustrating that, with controllers designed for a relatively small number of groups, power system stability may be significantly improved after an $N-1$ contingency compared to continued use of the nominal controller. Furthermore, performance is comparable to that of controllers designed for each contingency individually

A case of tuberculosis and aspergillosis in a Long-Legged Buzzard (Butep Rafinus)

A four-year old female Long-legged Buzzard with 4x5,5x3 cm fluctuant lesion under the left wing was brought to the Surgery Department of Erciyes University, School of Veterinary Medicine, clinically extremely emaciated and weak. The fluctuant mass was surgically removed but the Long-legged Buzzard died due to its poor condition. At necropsy, grey-white-coloured necrotic lesions in ileum and spleen, and yellow-brown-coloured hard nodules in the which one lung were observed. Samples from the mass, spleen, intestines, and lungs were examined histologically. Bacterial clusters within and around the necrotic mass were surrounded by giant cells, followed by cell infiltrations with heterophils and macrophages, and finally covered with a fibrous tissue capsule. Also observed were spores, hyphae, and conidiophore structures characteristic of fungi in bronchial lumina and surrounding mesobronchus as well as lesions similar to that of the lung. For the differential diagnosis, Ziehl-Neelsen and Gridley's staining were performed. Gram (+) and acid-fast bacteria in the mass from the wing, spleen, intestines, and lungs, and also hyphae and spores of fungi in the lung were identified. In the bacteriological examination, Mycobacterium sp. was isolated after inoculation into Lowenstein-Jensen medium containing glycerin. In addition, Aspergillus fumigatus was identified and isolated from lung

Tumor budding in laryngeal carcinoma

Background: Tumor budding was defined as a single cancer cell or a cluster of fewer than five cancer cells in the stroma of the invasive tumor margin. It has been suggested as a prognostic factor in various cancers, such as esophageal, lung, colorectal, and endometrial. There are only a few studies about the prognostic signifi cance of tumor budding in laryngeal carcinomas. Materials and Methods: A total of 81 patients with laryngeal carcinoma diagnosed between 2011 and 2016 and treated by partial or total laryngectomy were evaluated. Clinicopathologic parameters were correlated with the presence and grade of tumor budding. Results: The study was consisted of 77 (95.1%) male and 4 (4.9%) female patients. The mean age of the patients was 60.2 years (min: 42 and max: 78). Median follow-up time was 25 months (min: 7 and max: 54) (SD ±11.5). Histopathologic diagnosis was squamous cell carcinoma (SCC) in all patients. Of the 62 cases showing budding, 2 (3.2%) were stage 1, 12 (19.4%) stage 2, 16 (25.8%) stage 3, and 32 (51.6%) were stage 4. Fifteen cases with budding (24.2%) showed lymphovascular invasion (LVI). None of the nonbudding cases had LVI and perineural invasion (PNI). Statistical analysis revealed that LVI and PNI were signifi cantly associated with budding (P = 0.017 and P = 0.012). Among the tumors showing budding, 37% had lymph node metastasis (LNM). In nonbudding cases 15% had LNM. There was a statistically significant correlation between LNM and budding (P = 0.017). None of the parameters correlated with grade of tumor budding statistically. Conclusion: The results of this study suggest that tumor budding might be used as a prognostic factor in laryngeal SCCs

A patient presenting with concha bullosa in another concha bullosa: a case report

INTRODUCTION: Anatomic variations of the paranasal sinuses are very common. The paranasal sinus anatomy should be carefully examined prior to performing endoscopic sinus surgery in terms of both existent pathologies and anatomic variations. The anatomy of the paranasal sinuses and its variations have gained importance, along with advances in coronal paranasal sinus computed tomography and extensive use of endoscopic sinus surgery. CASE PRESENTATION: A 53-year-old Caucasian woman was admitted to our clinic with complaints of nasal breathing difficulties and headache persisting for a long time. Another concha bullosa was detected in the middle concha bullosa on preoperative paranasal computed tomography examination. It is known that the paranasal sinuses have a number of anatomical variations. CONCLUSION: Herein we report a rare case, along with a review of the literature, to emphasize that a concha bullosa inside another concha bullosa should not be ignored

A patient presenting with concha bullosa in another concha bullosa: a case report

Abstract Introduction Anatomic variations of the paranasal sinuses are very common. The paranasal sinus anatomy should be carefully examined prior to performing endoscopic sinus surgery in terms of both existent pathologies and anatomic variations. The anatomy of the paranasal sinuses and its variations have gained importance, along with advances in coronal paranasal sinus computed tomography and extensive use of endoscopic sinus surgery. Case presentation A 53-year-old Caucasian woman was admitted to our clinic with complaints of nasal breathing difficulties and headache persisting for a long time. Another concha bullosa was detected in the middle concha bullosa on preoperative paranasal computed tomography examination. It is known that the paranasal sinuses have a number of anatomical variations. Conclusion Herein we report a rare case, along with a review of the literature, to emphasize that a concha bullosa inside another concha bullosa should not be ignored.</p