Metallurgical characterization of the fracture of several high strength aluminum alloys

The fracture behavior for structural aluminum alloys (2024, 6061, 7075, and 7178) was examined in selected heat treatments. The investigation included tensile, shear, and precracked notch-bend specimens fractured at ambient temperature under monotonic loading. Specimens were obtained from thin sheets and thick plates and were tested in longitudinal and transverse orientations at different strain rates. Microstructures of alloys were examined using the optical microscope and the scanning electron microscope with associated energy dispersive X ray chemical analysis. Several different types of second phase particles, some not reported by other investigators, were identified in the alloys. Fracture morphology was related to microstructural variables, test variables, and type of commercial product. Specimen orientation examined in the present investigation had little effect on fracture morphology. Test strain rate changes resulted in some change in shear fracture morphology, but not in fracture morphology of tensile specimens

Repair of distal hypospadias: cosmetic or reconstructive

Objective: Hypospadias is one of the most common congenital anomalies of male genitalia and is usually repaired in the first 2 years of life. Regarding distal forms of hypospadias, however, controversies surrounding the need for surgical repair may lead to delayed referral secondary to symptoms. This article reviews the authors’ experience in boys who presented with symptoms secondary to an untreated distal hypospadias. / Materials and methods: The authors reviewed their prospectively maintained database and included all children who were secondarily referred because of symptoms due to untreated distal hypospadias in the last 5 years. The data were reviewed and analysed. / Results: Seventeen patients were identified. The median age at referral was 118 months. Symptoms at presentation included poor stream, straining during voiding, incontinence, and unhappiness related to cosmesis. Surgical correction included meatoplasty or tubularised incised plate urethroplasty. The choice between foreskin reconstruction or circumcision was based on parental preference. / Conclusion: The authors have presented a cohort of children with untreated distal hypospadias associated with functional and cosmetic problems. Both could be underestimated at birth, leading to problems in late childhood. Viewing repair of distal hypospadias as a purely cosmetic surgery is to disregard the nature of the anomaly and its associated implications

मात्स्यिकी से आजीविका प्राप्त करने के पारिप्रेक्ष्य में जल‌ ‌जीव (बहुउद्देशीय) आहार संयंत्र की विनिदिष्ट भूमिका

कृपया पूरा लेख पढे

AGGRESSIVE†CLEAR CELL CHONDROSARCOMA OF THE HARD PALATE

Chondrosarcomas constitute 1 to 3% of all head and neck tumours. 2% of all chondrosarcomas are of the clear cell†variety which follow a locally aggressive, relatively indolent course without predominant invasion of soft tissue. We present a 45-year-old woman presented with a bleeding mass in the oral cavity with change of voice of one year duration with pain of one month duration and histopathological analysis revealed a clear cell chondrosarcoma

Automated classification of three-dimensional reconstructions of coral reefs using convolutional neural networks

© The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Hopkinson, B. M., King, A. C., Owen, D. P., Johnson-Roberson, M., Long, M. H., & Bhandarkar, S. M. Automated classification of three-dimensional reconstructions of coral reefs using convolutional neural networks. PLoS One, 15(3), (2020): e0230671, doi: 10.1371/journal.pone.0230671.Coral reefs are biologically diverse and structurally complex ecosystems, which have been severally affected by human actions. Consequently, there is a need for rapid ecological assessment of coral reefs, but current approaches require time consuming manual analysis, either during a dive survey or on images collected during a survey. Reef structural complexity is essential for ecological function but is challenging to measure and often relegated to simple metrics such as rugosity. Recent advances in computer vision and machine learning offer the potential to alleviate some of these limitations. We developed an approach to automatically classify 3D reconstructions of reef sections and assessed the accuracy of this approach. 3D reconstructions of reef sections were generated using commercial Structure-from-Motion software with images extracted from video surveys. To generate a 3D classified map, locations on the 3D reconstruction were mapped back into the original images to extract multiple views of the location. Several approaches were tested to merge information from multiple views of a point into a single classification, all of which used convolutional neural networks to classify or extract features from the images, but differ in the strategy employed for merging information. Approaches to merging information entailed voting, probability averaging, and a learned neural-network layer. All approaches performed similarly achieving overall classification accuracies of ~96% and >90% accuracy on most classes. With this high classification accuracy, these approaches are suitable for many ecological applications.This study was funded by grants from the Alfred P. Sloan Foundation (BMH, BR2014-049; https://sloan.org), and the National Science Foundation (MHL, OCE-1657727; https://www.nsf.gov). The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript

The Ecological and Ethical Consumption Development Prospects in Poland Compared with the Western European Countries

An overview of the Western European literature shows that one of the most distinct trends in consumption that has been noted in the recent years is globally increasing environmental and social awareness. The issue of consumers' behaviours and attitudes towards "socially responsible products" has been gaining importance in Polish economy as well. This article evaluates the development prospects of ethical and ecological consumption in Poland vis-à-vis Western European countries. The comparative analysis being part of the article utilizes primary sources of information, i.e. interviews with a representative sample of Polish adults, as well as secondary sources of information. A factor analysis or, more precisely, a principal component analysis, allowed dividing Polish consumers into groups that were typologically homogeneous in respect of their sensitivity to various aspects of business ethics and ecology.Przegląd literatury zachodnio-europejskiej pozwala stwierdzić, że jednym z najbardziej zauważalnych trendów w sferze konsumpcji w ostatnich latach jest coraz większa świadomość ekologiczna i społeczna w wymiarze globalnym. Problematyka zachowań i postaw konsumentów wobec produktów "społecznie odpowiedzialnych" nabiera coraz większego znaczenia także w polskiej gospodarce. Celem artykułu jest ocena perspektyw rozwoju etyczneji ekologicznej konsumpcji w Polsce na tle krajów zachodnio-europejskich. Analizę porównawczą prowadzono bazując na źródłach wtórych jak i badaniach pierwotnych realizowanych na reprezentatywnej próbie losowej dorosłych mieszkańców Polski. W oparciu o analizę czynnikową, a dokładniej metodę analizy głównych składowych, dokonano także podziału polskich konsumentów na jednorodne grupy typologiczne pod względem ich wrażliwości na różne aspekty związane z ekologią i etyką

MAXILLARY INFLAMMATORY MYOFIBROBLASTIC TUMOR

Inflammatory myofibroblastic tumor (IMT) is a benign disorder of locally aggressive nature. It is an indolent tumor with a slowly progressive course and varied manifestation presenting with a wide range of clinical manifestations depending on the site of origin. We present a case of IMT in the maxillary sinus presenting with hemifacial pain, oculomotor palsy and ptosis which was successfully treated with endoscopic local excision and oral steroid therapy.Keywords: Plasma cell granuloma, Maxillary pseudotumor, Maxillectomy, Steroid therapy, Radiotherapy

Matching Disparate Image Pairs Using Shape-Aware ConvNets

An end-to-end trainable ConvNet architecture, that learns to harness the power of shape representation for matching disparate image pairs, is proposed. Disparate image pairs are deemed those that exhibit strong affine variations in scale, viewpoint and projection parameters accompanied by the presence of partial or complete occlusion of objects and extreme variations in ambient illumination. Under these challenging conditions, neither local nor global feature-based image matching methods, when used in isolation, have been observed to be effective. The proposed correspondence determination scheme for matching disparate images exploits high-level shape cues that are derived from low-level local feature descriptors, thus combining the best of both worlds. A graph-based representation for the disparate image pair is generated by constructing an affinity matrix that embeds the distances between feature points in two images, thus modeling the correspondence determination problem as one of graph matching. The eigenspectrum of the affinity matrix, i.e., the learned global shape representation, is then used to further regress the transformation or homography that defines the correspondence between the source image and target image. The proposed scheme is shown to yield state-of-the-art results for both, coarse-level shape matching as well as fine point-wise correspondence determination.Comment: First two authors contributed equally, to Appear in the IEEE Winter Conference on Applications of Computer Vision (WACV) 201