Prediction the Performance Rate of Chain Type Trenching Machine

The mathematical analysis for estimating the performance rate "RP" of chain-type trenching machine was studied. The mathematical analysis ended with an equation for this type. This mathematical equation was checked under different operating conditions. The practical study of the performance rate showed that the deviation of the theoretical performance rate from the actual performance rate ranged from -3.4 to +2% only for the 150.7 cm and 120.7 cm trench depth respectively. The machine field efficiency ranged from 46.7 to 57% for the 150.7 cm and 120.7 cm depth respectively. It also showed an increase in machine field efficiency by decreasing the trench depth.

Avaliação de intervenções educativas e conhecimento da equipe de enfermagem no uso de eletrocirurgia

Objetivo: Evaluar el efecto de las intervenciones educativas en el conocimiento y la aplicabilidad de la electrocirugía del equipo de enfermería.Material y método: Cuasiexperimento, con evaluaciones antes y después en un solo grupo, llevado a cabo en el centro quirúrgico de un hospital universitario terciario brasileño. Se realizó en siete etapas, se aplicó un cuestionario semiestructurado para evaluar los conocimientos de los participantes. Los participantes fueron expuestos a dos intervenciones educativas (clase expositiva, dialogada y video clase) y después de cada intervención se evaluó la retención de conocimientos. También se evaluaron indicadores de la aplicación de la unidad de electrocirugía durante los procedimientos quirúrgicos.Resultados: Participaron del estudio 4 enfermeros y 28 técnicos en enfermería. Los enfermeros tenían conocimientos previos sobre el tema de la mayor parte de los tópicos. Los técnicos en enfermería, mejoraron en los ítems verificación del equipamiento y colocación de la placa. Conclusiones: Los profesionales presentaron un buen desempeño teórico pero el mismo no se refleja en la práctica porque los profesionales son reacios a realizar prácticas que no coincidan con la teoría. La realización de este tipo de investigaciones es conveniente porque les permite a los gestores la posibilidad de proponer proyectos para una mejora continua de la asistencia perioperatoria. Objective: To evaluate the effect of educational interventions on the Nursing team's knowledge and applicability of electrosurgery.Material and Method: A quasi-experiment, with pre- and post-tests in a single group developed in the operating room of a Brazilian tertiary-level university hospital. It was developed in seven stages, with the application of a semi-structured questionnaire to assess the participants' knowledge. The participants were exposed to two educational interventions (lecture, dialogue and video-lesson) and, after each intervention, they were evaluated for knowledge retention. Indicators of the application of the electrosurgery unit during surgical procedures were also evaluated.Results: Four nurses and 28 nursing technicians participated in the study. The nurses had prior knowledge of the theme on most of the topics. Among the nursing technicians, there was an improvement in the “equipment check” and “electrodispersive plate positioning” items. Conclusions: The professionals presented good theoretical performance but the same is not evidenced in the practice because they are reluctant to having a practice different from the theory. Research of this nature is timely because it provides managers with a possibility to propose projects for continuous improvement of perioperative assistance. Objetivo: Avaliar o efeito de intervenções educativas no conhecimento e aplicabilidade de eletrocirurgia da equipe de enfermagem. Material e Método: Quase-experimento, com pré e pós-testes em um único grupo desenvolvido no centro cirúrgico de um hospital universitário terciário brasileiro. Foi desenvolvido em sete etapas, com aplicação de questionário semi-estruturado para avaliação do conhecimento dos participantes. Os participantes foram expostos a duas intervenções educativas (aula expositiva, dialogada e vídeo aula) e após cada uma das intervenções, foram avaliados quanto a retenção do conhecimento. Também foram avaliados indicadores da aplicação da unidade de eletrocirurgia durante os procedimentos cirúrgicos. Resultados: Participaram do estudo quatro enfermeiros e 28 técnicos de enfermagem. Os enfermeiros apresentaram conhecimento prévio do tema na maioria dos tópicos. Entre os técnicos de enfermagem, observou-se melhora nos itens checagem do equipamento e posicionamento da placa eletrodispersiva. Conclusões: Os profissionais apresentaram um bom rendimento teórico, porém o mesmo não fica evidente na prática pois os profissionais relutam em ter uma prática diferente da teoria. Pesquisas dessa natureza são oportunas pois proporcionam aos gestores uma possibilidade de propor projetos de melhoria contínua da assistência perioperatória.

Effect of Gas Blockage on the Theoretical Performance of Thermoacoustic Refrigerators

Thermoacoustic refrigeration is an emerging green, novel and promising alternate technology compared to vapor compression refrigerator systems for domestic cooling. It uses environmentally benign gases like air or helium or the mixture of inert gases as working substances and has no moving parts, no lubrication and no vibration. The cooler is designed and optimized with helium and air as refrigerants operating at 10[Formula: see text]bar with 3% drive ratio for the temperature difference of 28[Formula: see text]K and stack diameter of 200[Formula: see text]mm using linear thermoacoustic theory. In this paper, the effect of gas blockage (porosity) of the spiral-stack heat exchanger system ranging from 45% to 85% on the theoretical performance of the cooler is discussed. The one-third and one-fourth wavelength convergent–divergent resonator designs are optimized with air and helium as working substances, respectively, to improve performance and power density. The optimized coolers show best performance with 85% porosity. The theoretical results are validated with DeltaEC software simulation results. The simulation results show the coefficient of performance and cooling capacity of 0.93 and 219[Formula: see text]W for helium and of 0.50 and 139[Formula: see text]W for air, respectively, at the cold heat exchanger temperature of 0∘C.

Improving the productivity of the cutter-loader

The task of the conducted research is to determine the dependence of the productivity of the cutter-loader on the parameters of the engagement of the teeth of the wheel-rack mover of chainless haulage systems. To solve this problem, the dependence of the influence of the parameters of the toothed gearing of the wheel-rack mover of the chainless haulage system on the performance of the cutter-loader is found using the mathematical apparatus. The equation of the balance of the power of the cutter-loader is made, taking into account the mechanical energy input for the destruction of the formation, loading the destroyed mineral mass onto the face conveyor (relevant for cutter-loaders for excavating thin flat-lying seams) and moving the cutter-loader. The theoretical performance of the cutter-loader depends on the redistribution of the mechanical energy of the drive electric motor, aimed at the destruction of the mineral and the translational movement of the cutter-loader. The correlation of the productivity of the cutter-loader with the parameters of the engagement of the teeth of the wheel-rack mover of chainless haulage system systems is revealed. The obtained dependences of the performance of the cutter-loader allow assessing the degree of influence of the parameters of the toothed gearing of the mover of the chainless haulage system on the performance of the cutter-loader. The possibility of increasing the minute productivity of the cutter-loader by up to 20% when using a wheel-rack mover of a chainless haulage system with an optimal tooth profile is established.

Diálogos disyuntivos. Psicoanálisis y Teoría Crítica

Este artículo examina, en primer lugar, el lugar de lo social y la cultura en los escritos de Sigmund Freud y Jacques Lacan. A continuación, se reconstruyen los esfuerzos de diálogo entre Teoría Crítica y Psicoanálisis elaborados por Herbert Marcuse y Axel Honneth. Finalmente se destacan algunos criterios y problemas que permitan situar en distintos planos a los rendimientos teóricos del cruce entre teoría crítica y psicoanálisis. -- This article examines, first, the place of the social and culture in the writings of Sigmund Freud and Jacques Lacan. Next, the dialogue efforts between Critical Theory and Psychoanalysis elaborated by Herbert Marcuse and Axel Honneth are reconstructed. Finally, some criteria and problems are highlighted that allow the theoretical performance of the cross between critical theory and psychoanalysis to be placed on different levels.