Flame resistant elastic elastomeric fibers

Development of materials to improve flame resistance of elastic elastomeric fibers is discussed. Two approaches, synthesis of polyether based urethanes and modification of synthesized urethanes with flame ratardant additives, are described. Specific applications of both techniques are presented

Flame retardant spandex type polyurethanes

Flame retardant elastomeric compositions were developed, comprised of: (1) spandex type polyurethane having incorporated into the polymer chain, halogen containing polyols; (2) conventional spandex type polyurethanes in physical admixture flame retardant additives; and (3) fluoroelastomeric resins in physical admixture with flame retardant additives. Methods of preparing fibers of the flame retardant elastomeric materials are presented and articles of manufacture comprised of the elastomeric materials are mentioned

Flame resistant elastic elastomeric fiber

Compositions exhibit elastomeric properties and possess various degrees of flame resistance. First material polyurethane, incorporates halogen containing polyol and is flame resistant in air; second contains spandex elastomer with flame retardant additives; and third material is prepared from fluorelastomer composition of copolymer of vinylidene fluoride and hexafluoropropylene

Non-flammable elastomeric fiber from a fluorinated elastomer and containing an halogenated flame retardant

Flame retardant elastomeric compositions are described comprised of either spandex type polyurethane having incorporated into the polymer chain halogen containing polyols, conventional spandex type polyurethanes in physical admixture with flame retardant additives, or fluoroelastomeric resins in physical admixture with flame retardant additives. Methods are described for preparing fibers of the flame retardant elastomeric materials and articles of manufacture comprised of the flame retardant clastomeric materials and non elastic materials such as polybenzimidazoles, fiberglass, nylons, etc

PlayeRank: data-driven performance evaluation and player ranking in soccer via a machine learning approach

The problem of evaluating the performance of soccer players is attracting the interest of many companies and the scientific community, thanks to the availability of massive data capturing all the events generated during a match (e.g., tackles, passes, shots, etc.). Unfortunately, there is no consolidated and widely accepted metric for measuring performance quality in all of its facets. In this paper, we design and implement PlayeRank, a data-driven framework that offers a principled multi-dimensional and role-aware evaluation of the performance of soccer players. We build our framework by deploying a massive dataset of soccer-logs and consisting of millions of match events pertaining to four seasons of 18 prominent soccer competitions. By comparing PlayeRank to known algorithms for performance evaluation in soccer, and by exploiting a dataset of players' evaluations made by professional soccer scouts, we show that PlayeRank significantly outperforms the competitors. We also explore the ratings produced by {\sf PlayeRank} and discover interesting patterns about the nature of excellent performances and what distinguishes the top players from the others. At the end, we explore some applications of PlayeRank -- i.e. searching players and player versatility --- showing its flexibility and efficiency, which makes it worth to be used in the design of a scalable platform for soccer analytics

Architecture of Virtual Power Plant for Ancillary Services

The increased penetration of distributed energy resources opens up issues in power system as a whole. This creates markets opportunities for ancillary services; particularly TSO deals with the issues of congestion management, reserves, reactive power control etc. Literature suggests different techniques where TSO and DSO interact with each other, and in this way, DSO can offer flexibility to TSO in terms of provision of ancillary services. The paper discusses the issues that the current power system face due to the profound effects of new generating resources, and then examines in detail the way these issues are resolved in a conventional manner. Then, the paper discusses some literature proposals for the interaction between TSO-DSO for solving the issues in an efficient manner, and finally presents the architecture where a Virtual Power Plant (VPP) is developed to facilitate DSO with a platform for the provision of ancillary services

Development of a flameproof elastic elastomeric fiber

Various flexible polyurethane structures containing halogen were synthesized from polyesters derived from aliphatic or aromatic polyols and dibasic acids. Aliphatic halide structures could not be used because they are unstable at the required reaction temperatures, giving of hydrogen halide which hydrolyzes the ester linkages. In contract, halogen-containing aromatic polyols were stable and satisfactory products were made. The most promising composition, a brominated neopentyl glycol capped with toluene disocyanate, was used as a conventional diisocyanate, in conjunction with hydroxy-terminated polyethers or polyesters to form elastomeric urethanes containing about 10% bromine with weight. Products made in this manner will not burn in air, have an oxygen index value of about 25, and have tensile strength values of about 5,000 psi at 450% elongation. The most efficient additives for imparting flame retardancy to Spandex urethanes are aromatic halides and the most effective of these are the bromide compounds. Various levels of flame retardancy have been achieved depending on the levels of additives used

Obtención de proteasas microbianas

La producción de proteasas extracelulares por microorganismos es conocida desde hace tiempo; y en un principio, esa capacidad fue utilizada como un método de identificación de especies microbianas. Para la aplicación industrial de proteasas se recurrió inicialmente a preparados enzimáticos, en su mayoría provenientes de tejidos animales y vegetales . El gran incremento en la demanda de estas enzimas se produjo a partir del año 1960 como consecuencia de su aplicación como aditivo en los detergentes utilizados a nivel industrial y doméstico. El éxito logrado por la incorporación de enzimas a detergentes se alcanzó cuando se encontraron enzimas microbianas, fundamentalmente las producidas por bacterias del genero Bacillus, que reunían ciertas propiedades como gran estabilidad en el rango de pH y temperatura de aplicación de dichos preparados y elevada actividad en presencia de los componentes de los detergentes, algunos de los cuales presentan una marcada inhibición sobre ciertas proteasas. Es importante también considerar la efectividad y capacidad para eliminar manchas a bajas concentraciones, y la posibilidad de tener bajos costos de producción con respecto a los métodos clásicos de obtención a partir de células animales y vegetales. La gran demanda comercial de estas enzimas condujo a un rápido desarrollo sobre todo de la producción en gran escala, este incentivo tuvo una rápida respuesta en los estudios realizados sobre los diferentes aspectos biotecnológicos que hacen a la producción de estas enzimas como lo demuestran los numerosos trabajos aparecidos después de 1960. Si bien la bibliografía es muy abundante en lo que se refiere a métodos de aislamiento, selección de cepas productoras, y estudios de las propiedades de las diferentes enzimas producidas por microorganismos, no se encuentra mucha información sobre la composición de medios de cultivo y las condiciones tecnológicas de proceso de obtención de dichas enzimas. En base a las consideraciones anteriores se programaron estudios sobre la influencia de los nutrientes del medio de cultivo y variables de operación sobre la producción enzimática, con el fin de establecer las condiciones de optimización de proceso. El trabajo tiene por fin ademas, colaborar al desarrollo de la industria en nuestro país para la producción de proteasas que presentan un amplio espectro de aplicación y de utilización. Antes de considerar los estudios realizados donde se consignan los resultados obtenidos, se hará referencia a las principales propiedades de estas enzimas y sus principales aplicaciones, considerando especialmente los tipos de enzima y los microorganismos que la producen.Tesis digitalizada en SEDICI gracias a la Biblioteca Central de la Facultad de Ciencias Exactas (UNLP).Facultad de Ciencias Exacta