Study of phenomena related to the sintering process of silicon nitride at atmospheric pressure

A procedure was perfected for the production of components used in engineering applications of silicon nitride. Particles of complex geometry that combine remarkable mechanical properties with a high density are obtained. The process developed, in contrast to the "hot pressing" method, does not use external pressures, and in contrast to the reaction bonding method, final densities close to the theoretical value are obtained

A measurement of the teaching effectiveness of educational kinescopes in general science in the junior high school.

Thesis (M.S.)--Boston Universit

Upadacitinib: One More Option in the Treatment of Patients with Rheumatoid Arthritis and Crohn's Disease

Arthritis and IBD are conditions that can occur in the same patient simultaneously. The complexity in managing these cases lies in detecting the signs and symptoms that point to the onset of the disease at an early stage, and in choosing an appropriate course of treatment to control the joint and intestinal aspects at the same time. In recent times, a new class of drugs has been added to the treatment options: JAK inhibitors (JAKi), of which Upadacitinib is one. Being able to manage and follow up with these patients in joint gastro-rheumatology outpatient clinics, where professionals from both disciplines are able to follow these cases appropriately, avoiding delays in diagnosis andtreatment, is also importan

Retroperitoneal pararenal isolated neurofibroma: report of a case and review of literature

The neurofibroma is a tumour of neural origin. This kind of neoplasm, though, is generally skin located. Rare cases in deep organs or in the peritoneal cavity are also reported in the literature. There are two types of neurofibromas, localized and diffuse; the latter is associated with von Recklinghausen disease and always occurs together with skin neurofibromas. Here we report the case of a 47-year-old man affected by retroperitoneal neurofibroma, but not associated with von Recklinghausen disease. A computed tomography (CT) scan described a retroperitoneal pararenal lesion with no clear involvement of adjacent viscera. We describe the diagnostic modality, treatment planning and the timing of treatment of this neoplasm, reviewing also the literature

Diatom extraction: A new technique with heated H2O2. A technical note

The best method of diatom identification in animal and human tissues is still an important discussion topic, in terms of effectiveness and reliability. In this technical note, authors propose a new method of extraction of diatoms using heated hydrogen peroxide from animal and human tissue samples. This method has been compared with the traditional method of digestion with acids. The results of the comparison show that heated hydrogen peroxide extraction is more efficient in terms of reduction of sediment, extraction of the material and preservation of diatoms proving to be a viable alternative to conventional approaches with acids in terms of costs and operator safety

Ingress of Coolant Event simulation with TRACE code with accuracy evaluation and coupled DAKOTA Uncertainty Analysis

Among the Postulated Initiating Events in nuclear fusion plants, the Ingress of Coolant Event (ICE) in the Plasma Chamber is one of the main safety issues. In the present paper, the best estimate thermal-hydraulic system code TRACE, developed by USNRC, has been adopted to study the ICE, and it has been qualified based on experimental results obtained in the Integrated ICE facility at JAERI. A nodalization has been developed in the SNAP environment/architecture, using also the TRACE 3D Vessel component where multidimensional phenomena could occur. The accuracy of the code calculation has been assessed both from a qualitative and quantitative point of view. In addition, an Uncertainty Analysis (UA), with the probabilistic method to propagate the input uncertainties, has been performed to characterize the dispersion of the results. The analysis has been carried out with the DAKOTA toolkit coupled with TRACE code in the SNAP environment/architecture. Results show the adequacy of the 3D nodalization and the capability of the code to follow the transient evolution also at a very low pressure. Response correlations have been computed to characterize the correlation between the selected uncertain input parameters and the Plasma Chamber pressure

Achieving portability through software conversion

Conversion of software written for one machine or operating system to equivalent software for another machine or operating system is shown to be economically attractive using source-to-source translation. The features of an automatic converter are described using a Pascal-to-C translater as an example. Solutions to the problems of denesting procedures, converting data structures and types, converting control structures and operators, and converting semantics in one language into equivalent semantics in another language are proposed and evaluated in terms of an algorithmic translator. The results obtained through experience suggest that algorithmic translation from one language to another can yield 95 to 99 per cent conversion without human intervention, leading to significant improvements over other methods of software conversion