Rotación de personal y su relación con la eficiencia en la empresa Jaipan Construction Company Eirl distrito de Carabayllo, año 2014

La presente investigación tuvo como objetivo determinar la relación entre la rotación de personal y la eficiencia en la empresa JAIPAN CONSTRUCTION COMPANY EIRL. Distrito Carabayllo, año 2014. Este proyecto se realizó mediante el método hipotético deductivo con enfoque cuantitativo, el nivel efectuado fue descriptivo correlacional, el tipo de desarrollo fue aplicada y técnica, y se utilizó para su propósito el diseño no experimental y de corte transversal. Por ello se tomó una muestra conformada por 57 trabajadores de la empresa constructora JAIPAN CONSTRUCTION COMPANY EIRL e, para la obtención de datos se utilizó la técnica de la encuesta y como instrumento el cuestionario, que estuvo compuesto por 40 preguntas en medición de la escala de Likert, luego de ello se midió el nivel de confiabilidad con el Alfa de Cronbach, teniendo como resultado aceptable. La investigación continúo midiendo el nivel de correlación de las V1 y V2, se usó la prueba de Rho de Spearman, teniendo como resultado la correlación de 0,850, por lo tanto, la investigación concluye dando a conocer que existe una correlación positiva alta entre las variables rotación de personal y la eficiencia en la empresa Jaipan Construction Company EIRL distrito de Carabayllo, año 2014

Hallazgos tomográficos y ecográficos pulmonares en dos pacientes con neumonía por SARS-CoV-2

Pulmonary tomographic and ultrasound findings in two patients diagnosed with SARS CoV-2 pneumonia at the time of admission to an intensive care unit are shown. Evaluation of the Six quadrant (Figure 1) for each hemithorax or Lung Ultrasound Score was used as a follow-up method, scored according to the ultrasound pattern: A lines (0 points), B lines (1 point), coalescent B lines: white lung (2 points), consolidation (3 points). The total score will be the sum of the two hemithoraxes.Se muestran los hallazgos tomográficos y ecográficos pulmonares de dos pacientes con diagnóstico de neumonía por SARS CoV-2, al momento del ingreso en una unidad de cuidados intensivos. Como método de seguimiento se empleó la evaluación de seis cuadrantes por cada hemitórax o Lung Ultrasound Score, puntuados de acuerdo al patrón ecográfico: líneas A (0 puntos), líneas B (1 punto), líneas B coalescentes: pulmón blanco (2 puntos), consolidación (3 puntos). La puntuación total será la suma de los dos hemitórax

Occurrence of corn stunt diseases and maize viruses in the Provinces of Tucumán and Córdoba in Argentina

A incidência de doenças causadas por molicutes e por vírus foi avaliada em lavouras de milho (Zea mays) nas Províncias de Tucumán e de Córdoba, na Argentina, em fevereiro de 2000. Na Província de Tucumán verificou-se que 44% das lavouras apresentaram altos níveis de incidência de plantas com sintomas de enfezamentos causados por molicutes (50 a 100%), em altitudes variando de 300 a 2.000 m. A presença de fitoplasma e de espiroplasma foi confirmada em amostras de folhas de plantas com sintomas de enfezamentos, através dos testes de PCR e de "Western blotting". Constatou-se, porém, que a eficiência desses testes para detecção destes patógenos, quando os sintomas apresentados pelas plantas eram muito acentuados, foi da ordem de 70%, e de apenas 30% quando os sintomas eram menos acentuados. Na localidade Jesus Maria, foram encontradas plantas apresentando acentuado nanismo, folhas estreitas e com deformações. Dentre quatro amostras destas plantas, submetidas a testes de PCR, em duas foi detectada a presença de fitoplasma, possivelmente d istinto do "Maize Bushy Stunt Phytoplasma". A cigarrinha Dalbulus maidis, inseto vetor dos molicutes, foi encontrada apenas em Tucumán, estando ausente em Córdoba. O Mal de Rio Cuarto virus foi detectado em seis lavouras em Córdoba, e em três em Tucumán. A cigarrinha Delphacodes kuscheli foi detectada em todas as lavouras em Córdoba, e em apenas três lavouras em Tucumán. O Maize dwarf mosaic virus foi detectado em cerca de 60% das lavouras amostradas nas duas Províncias e o Maize rayado fino virus em apenas uma localidade em Tucumán.The incidence of "corn stunt diseases" and maize (Zea mays) viruses was evaluated in maize fields located at the Provinces of Tucumán and Córdoba in Argentina in February 2000. A high number of plants infected with "corn stunt disease" were observed in Tucumán (up 50 to 100%) in 44% of maize crops surveyed in areas varying from up 300 to 2000 m high. The presence of Maize Bushy Stunt Phytoplasma (MBSP) and Corn Stunt Spiroplasma (CSS) was confirmed by PCR and Western blotting tests. In plants showing typical symptoms of MBSP or CSS, the pathogens were detected in 70% of the samples. However, when symptoms were weak, the efficiency of detection dropped to approximately 30%. In Rio Cuarto, Province of Córdoba, the presence of phytoplasma was detected only in three plants showing red leaf symptoms. In Jesus Maria locality, plants showing symptoms different from those caused by MBSP, were demonstrated to be infected by phytoplasma when analyzed by PCR using universal primers. The leafhopper Dalbulus maidis, vector of MBSP and CSS, was found only in Tucumán. The Mal de Rio Cuarto virus (MRCV) was found in six maize fields in Córdoba and in three maize fields located at 1970 to 2.000 m high in Tucumán. The plant hopper Delphacodes kuscheli, vector of MRCV, was found in both provinces sampled. The Maize dwarf mosaic virus (MDMV) was found in 60% of maize crops in both Provinces and the Maize rayado fino virus (MRFV)was found only in one location in Tucumán

Evolving trends in the management of acute appendicitis during COVID-19 waves. The ACIE appy II study

Background: In 2020, ACIE Appy study showed that COVID-19 pandemic heavily affected the management of patients with acute appendicitis (AA) worldwide, with an increased rate of non-operative management (NOM) strategies and a trend toward open surgery due to concern of virus transmission by laparoscopy and controversial recommendations on this issue. The aim of this study was to survey again the same group of surgeons to assess if any difference in management attitudes of AA had occurred in the later stages of the outbreak. Methods: From August 15 to September 30, 2021, an online questionnaire was sent to all 709 participants of the ACIE Appy study. The questionnaire included questions on personal protective equipment (PPE), local policies and screening for SARS-CoV-2 infection, NOM, surgical approach and disease presentations in 2021. The results were compared with the results from the previous study. Results: A total of 476 answers were collected (response rate 67.1%). Screening policies were significatively improved with most patients screened regardless of symptoms (89.5% vs. 37.4%) with PCR and antigenic test as the preferred test (74.1% vs. 26.3%). More patients tested positive before surgery and commercial systems were the preferred ones to filter smoke plumes during laparoscopy. Laparoscopic appendicectomy was the first option in the treatment of AA, with a declined use of NOM. Conclusion: Management of AA has improved in the last waves of pandemic. Increased evidence regarding SARS-COV-2 infection along with a timely healthcare systems response has been translated into tailored attitudes and a better care for patients with AA worldwide

Rotación de personal y su relación con la eficiencia en la empresa Jaipan Construction Company Eirl distrito de Carabayllo, año 2014

La presente investigación tuvo como objetivo determinar la relación entre la rotación de personal y la eficiencia en la empresa JAIPAN CONSTRUCTION COMPANY EIRL. Distrito Carabayllo, año 2014. Este proyecto se realizó mediante el método hipotético deductivo con enfoque cuantitativo, el nivel efectuado fue descriptivo correlacional, el tipo de desarrollo fue aplicada y técnica, y se utilizó para su propósito el diseño no experimental y de corte transversal. Por ello se tomó una muestra conformada por 57 trabajadores de la empresa constructora JAIPAN CONSTRUCTION COMPANY EIRL e, para la obtención de datos se utilizó la técnica de la encuesta y como instrumento el cuestionario, que estuvo compuesto por 40 preguntas en medición de la escala de Likert, luego de ello se midió el nivel de confiabilidad con el Alfa de Cronbach, teniendo como resultado aceptable. La investigación continúo midiendo el nivel de correlación de las V1 y V2, se usó la prueba de Rho de Spearman, teniendo como resultado la correlación de 0,850, por lo tanto, la investigación concluye dando a conocer que existe una correlación positiva alta entre las variables rotación de personal y la eficiencia en la empresa Jaipan Construction Company EIRL distrito de Carabayllo, año 2014

Separation of ternary hydrocarbon mixtures on Y zeolite membranes

The permeation of a mixture of n-hexane, n-decane and toluene through a 40 μm Y zeolite tubular membrane on a support with negligible resistance to the mass transfer at 250 °C was modelled based on the Maxwell-Stefan formulation and the ideal adsorbed solution theory (IAST). Individual adsorption parameters were obtained with a batch fluidized bed reactor and diffusion parameters were taken from the literature. The model allowed to predict the transient fluxes and surface coverages through the membrane, showing that the responses of the components diffusing faster (n-hexane and n-decane) overshoot their steady-state values. The permeance predictions (10-8 mol/s m2 Pa) ranged from 1.2 to 20 for n-decane, from 0.4 to 4.2 for n-hexane and from 0.8 to 4.0 for toluene, according to the feed pressure and composition. The permeance selectivities, defined with n-hexane as the reference, ranged between 3 and 6 for n-decane, and between 1 and 1.8 for toluene. It was also possible to define the association between hydrocarbon coverage profiles in the membrane and the corresponding resulting fluxes.Fil: Avila, Adolfo María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; ArgentinaFil: Sedran, Ulises Anselmo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentin

Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts

The adsorption isotherms of hexane, toluene and decane on a commercial FCC catalyst were determined in experiments performed in a CREC Riser Simulator laboratory reactor injecting different volumes of the pure hydrocarbons at 250, 300 and 350 °C. The adsorption isotherms could be described by Langmuir expressions, and the parameters assessed from the information given by simple mass balances, showed to be in line with previous reports. The order of adsorption constants was decane > toluene > hexane. The heats of adsorption were assessed. The simulation of the evolution of the pressure in the system in short contact time experiments with an unsteady state diffusion-adsorption model that considered the influence of the concentration on diffusion, allowed to assess the diffusion parameters corresponding to diluted systems. It was observed that the mechanism for mass transfer of n-paraffins inside the Y zeolite pores above 250 °C is not purely configurational. Experiments with short contact times typical of the commercial FCC process showed that decane and toluene, but not hexane, were adsorbed close to equilibrium under these experimental conditions. Apparent and equilibrium adsorption, and diffusion selectivities were defined considering hexane as the reference hydrocarbon, and they clearly indicated that diffusion resistances mask the assessment of adsorption parameters. Apparent selectivities become closer to equilibrium selectivities at higher system pressures, due to increases in the effective diffusivities.Fil: Avila, Adolfo María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; ArgentinaFil: Bidabehere, Claudia María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Sedran, Ulises Anselmo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentin

Comment on the paper "Diffusion and adsorption selectivities of hydrocarbons over FCC catalysts" by A.M. Ávila, C.M. Bidabehere and U. Sedran [Chem. Eng. J. 132 (2007) 67-75]

In a letter by Kärger [1] about our paper on the assessment of the diffusivities in fluid catalytic cracking (FCC) catalysts [2], it is mentioned that diffusivities calculated by different methods (macroscopic in one case, or from pulsed field gradient (PFG) NMR technique in the other) are different. It is also pointed out that the results of diffusivities for a given compound obtained from different macroscopic techniques are not explained satisfactorily. Both facts are true. We understand that the letter is not only a valuable contribution to the field, considering its large and laborious data collection, but also an incentive for the search of a better comprehension of the mechanisms controlling the FCC process. Most importantly, the differences observed should not hamper experiments with macroscopic techniques nor lead to disregard results suspected of mass and/or heat transfer limitations. It is important to recognize them as enriched by other type of information, and that they become necessary as design tools. By these reasons, and considering that not too much can be added to the details depicted in Ref. [1], we believe it would be useful to clarify some issues, mainly pointing to a distinct approach in the interpretation of the data.Fil: Bidabehere, Claudia María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Avila, Adolfo María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; ArgentinaFil: Sedran, Ulises Anselmo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentin

Adsorption of hydrocarbons on FCC catalysts under reaction conditions

A modified CREC Riser Simulator reactor was used in order to assess tne adsorption constants of various hydrocarbons produced in the cracking of n-hexadecane over an equilibrium commercial FCC catalyst at 550°C. Complementary experiments were performed with n-hexane on both the same catalyst and a pure HY zeolite. A method to estimate apparent hydrocarbon adsorption constants, based on mass balances, the assumption of Henry's law-type behavior, and the compositions observed in two samples, was proposed. One sample was collected immediately after reaction, representing the gas phase that is in equilibrium with the catalysts, and the other one included adsorbed hydrocarbons. It was shown that when a mixture of hydrocarbons produced by cracking reactions contacts the catalysts, there exists a selective enhancement in the adsorption of those hydrocarbons that individually adsorb more strongly. Additional experiments with simple mixtures and no chemical reaction confirmed these observations. Evidence suggests that the diffusive mass transport process in the catalyst particles plays an important role.Fil: de la Puente, Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; ArgentinaFil: Avila, Adolfo María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; ArgentinaFil: Chiovetta, Germán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; ArgentinaFil: Martignoni, Waldir P.. Petrobras; BrasilFil: Cerqueira, Henrique S.. Petrobras; BrasilFil: Sedran, Ulises Anselmo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catálisis y Petroquímica "Ing. José Miguel Parera"; Argentin