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13. The Working Cycle of the Motoring Internal Combustion Engine by a New Method with Cylinder Pressures as in Real Engine Operation

Author

Procházka Radek, Dittrich Aleš, Beroun Stanislav, Zvolský Tomáš, and Voženílek Robert

Subjects
internal combustion engine (ice), motoring without combustion, mechanical losses, thermodynamic analysis, experiment, Engineering (General). Civil engineering (General), TA1-2040
Abstract

The current standard methods of determining the mechanical losses of the ICE by motoring do not correspond to the low pressures in the cylinders of real engine operation. The new tried and tested method of determining passive resistances by motoring ICE with high working pressures in the cylinders is based on blowing doses of compressed air into the cylinders around BDC with special self-acting valves. When motoring with the new method, the same course of pressures in the cylinders and the same load on the crank mechanism, including the piston group, is achieved during combustion. The measurement proved the problem-free functionality of the self-acting valves, and the conducted experiments provided data on the dependence of mechanical and heat losses in the ICE on the working pressures in the cylinder.

Published
2022
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17. Early prediction of severity in acute pancreatitis

Author

Surco, Y., Huerta Mercado, J., Pinto, J., Piscoya, A., De Los Ríos, R., Prochazka, R., Zegarra, A., and Cieza Zevallos, J.

Subjects
pancreatitis aguda, BISAP, severidad, indicadores pronósticos, BISAP, prognostic scoring, pancreatitis aguda, acute pancreatitis, severity, severidad, indicadores pronósticos
Abstract

OBJETIVO: Identificar el indicador que mejor predice la severidad en forma temprana en pacientes con pancreatitis aguda. MATERIALES Y MÉTODOS: Se realizó un estudio de cohorte prospectiva entre diciembre del 2009 y diciembre del 2011. Se clasificó los cuadros de pancreatitis aguda en leve y severa en base a los criterios de falla orgánica o complicaciones locales según el Simposio de Atlanta. Los indicadores de APACHE-II, BISAP y urea fueron calculados usando los datos de las primeras 24 horas de admisión. El indicador de Ranson se calculó con datos de las primeras 48 horas. La hemoconcentración se calculó a las 24 horas de la admisión después de una adecuada hidratación. Para evaluar la capacidad predictiva de los diferentes indicadores se utilizó el área bajo la curva ROC. RESULTADOS: Ingresaron al estudio 329 pacientes con pancreatitis aguda: doscientos catorce mujeres (65%) y 115 varones (35%). La etiología más frecuente fue la biliar 245 (74.3%). Doscientos cuarenta fueron pancreatitis leves (73%) y 89 pancreatitis severas (27%). Las áreas bajo la curva ROC de los indicadores fueron: APACHE-II: 0.74; BISAP: 0.78; Ranson: 0.48; urea: 0.70; hematocrito a las 24 horas: 0.73. Se registraron 10 muertes (mortalidad: 3%). No se observó diferencias significativas del indicador BISAP con el indicador de APACHE-II, con la urea ni la hemoconcentración, pero sí con el puntaje de Ranson. CONCLUSIÓN: BISAP es un score sencillo que aplicado tempranamente en la emergencia identifica pacientes con cuadro clínico severo con eficacia similar al APACHE-II, urea y hemoconcentración; y mejor que Ranson. OBJECTIVE: To identify the score that best predicts early severity in patients with acute pancreatitis. MATERIALS AND METHODS: A prospective cohort study was performed from December 2009 to December 2011. Cases of pancreatitis were classified as mild or severe based on the organ failure criteria and/or local complications according to the Atlanta Symposium. APACHE-II, BISAP and urea were calculated using data from the first 24 hours. Ranson was calculated using data from the first 48 hours. Hemoconcentratión was assessed 24 hours from admission, after adequate hydration. To assess the predictive value of the different scores the area under the curve ROC was used. RESULTS: 329 patients with acute pancreatitis were included: 214 women (65%) and 115 males (35%). The most common etiology was biliary 245 (74.3%). Two hundred and forty were mild cases of pancreatitis (73%) and 89 were severe (27%). The areas under the curve ROC were: APACHE-II: 0.74; BISAP: 0.78; Ranson: 0.48; urea: 0.70; hemoconcentratión: 0.73. There were 10 deaths (mortality: 3%). There were no significant differences between BISAP and APACHE-II, urea or hemoconcentration, but a significant difference existed with Ranson score. CONCLUSION: BISAP is a simple score that applied early in the emergency room identifies patients with severe pancreatitis with an efficacy similar to APACHE-II, urea and hemoconcentration, and better than Ranson.

Published
2012

22. [Choledochal cyst in pregnancy and puerperium: report on two cases and review of literature]

Author

Prochazka R, Ojeda M, Hugo Guillermo Cedrón Cheng, Vila S, Piscoya A, De los Rios R, Jl, Pinto, Huerta-mercado J, and Bussalleu A

Subjects
Adult, Pregnancy Complications, Pregnancy, Choledochal Cyst, Humans, Female, Puerperal Disorders
Abstract

A choledochal cyst is a cystic dilation of the intrahepatic or extrahepatic biliary tract. According to the most accepted theory, it is caused by an anomalous pancreatobiliary junction. The most important complications are cholangiocarcinoma, lithiasis, and pancreatitis. Current therapy is surgical resection. Only 20% to 30% of cases are diagnosed in adult life. Two cases of choledochal cysts are reported in female adult patients, one of them in late pregnancy and the other in puerperium. Diagnosis of choledochal cyst in pregnancy and puerperium is an uncommon event, entailing particular considerations regarding symptoms and treatment.

Published
2007

26. FEMALE (IN)FERTILITY

Author

Kanta Goswami, S., primary, Banerjee, S., additional, Saha, P., additional, Chakraborty, P., additional, Kabir, S. N., additional, Karimzadeh, M. A., additional, Mohammadian, F., additional, Mashayekhy, M., additional, Saldeen, P., additional, Kallen, K., additional, Karlstrom, P. O., additional, Rodrigues-Wallberg, K. A., additional, Salerno, A., additional, Nazzaro, A., additional, Di Iorio, L., additional, Marino, S., additional, Granato, C., additional, Landino, G., additional, Pastore, E., additional, Ghoshdastidar, B., additional, Chakraborty, C., additional, Ghoshdastidar, B. N., additional, Ghoshdastidar, S., additional, Partsinevelos, G. A., additional, Papamentzelopoulou, M., additional, Mavrogianni, D., additional, Marinopoulos, S., additional, Dinopoulou, V., additional, Theofanakis, C., additional, Anagnostou, E., additional, Loutradis, D., additional, Franz, C., additional, Nieuwland, R., additional, Montag, M., additional, Boing, A., additional, Rosner, S., additional, Germeyer, A., additional, Strowitzki, T., additional, Toth, B., additional, Mohamed, M., additional, Vlismas, A., additional, Sabatini, L., additional, Caragia, A., additional, Collins, B., additional, Leach, A., additional, Zosmer, A., additional, Al-Shawaf, T., additional, Beyhan, Z., additional, Fisch, J. D., additional, Danner, C., additional, Keskintepe, L., additional, Aydin, Y., additional, Ayca, P., additional, Oge, T., additional, Hassa, H., additional, Papanikolaou, E., additional, Pados, G., additional, Grimbizis, G., additional, Bili, H., additional, Karastefanou, K., additional, Fatemi, H., additional, Kyrou, D., additional, Humaidan, P., additional, Tarlatzis, B., additional, Gungor, F., additional, Karamustafaoglu, B., additional, Iyibozkurt, A. C., additional, Ozsurmeli, M., additional, Bastu, E., additional, Buyru, F., additional, Di Emidio, G., additional, Vitti, M., additional, Mancini, A., additional, Baldassarra, T., additional, D'Alessandro, A. M., additional, Polsinelli, F., additional, Tatone, C., additional, Leperlier, F., additional, Lammers, J., additional, Dessolle, L., additional, Lattes, S., additional, Barriere, P., additional, Freour, T., additional, Elodie, P., additional, Assou, S., additional, Van den Abbeel, E., additional, Arce, J. C., additional, Hamamah, S., additional, Dechaud, H., additional, Haouzi, D., additional, Tiplady, S., additional, Johnson, S., additional, Jones, G., additional, Ledger, W., additional, Eizadyar, N., additional, Ahmad Nia, S., additional, Seyed Mirzaie, M., additional, Azin, S. A., additional, Yazdani Safa, M., additional, Onaran, Y., additional, Iltemir Duvan, C., additional, Keskin, E., additional, Ayrim, A., additional, Kafali, H., additional, Kadioglu, N., additional, Guler, B., additional, Var, T., additional, Cicek, M. N., additional, Batioglu, A. S., additional, Lichtblau, I., additional, Olivennes, F., additional, de Mouzon, J., additional, Dumont, M., additional, Junca, A. M., additional, Cohen-Bacrie, M., additional, Hazout, A., additional, Belloc, S., additional, Cohen-Bacrie, P., additional, Allegra, A., additional, Marino, A., additional, Sammartano, F., additional, Coffaro, F., additional, Scaglione, P., additional, Gullo, S., additional, Volpes, A., additional, Prisant, N., additional, Saare, M., additional, Vaidla, K., additional, Salumets, A., additional, Peters, M., additional, Jindal, U. N., additional, Thakur, M., additional, Shvell, V., additional, Diamond, M. P., additional, Awonuga, A. O., additional, Veljkovic, M., additional, Macanovic, B., additional, Milacic, I., additional, Borogovac, D., additional, Arsic, B., additional, Pavlovic, D., additional, Lekic, D., additional, Bojovic Jovic, D., additional, Garalejic, E., additional, Jayaprakasan, K., additional, Eljabu, H., additional, Hopkisson, J., additional, Campbell, B., additional, Raine-Fenning, N., additional, Kop, P., additional, van Wely, M., additional, Mol, B. W., additional, Melker, A. A., additional, Janssens, P. M. W., additional, Nap, A., additional, Arends, B., additional, Roovers, J. P. W. R., additional, Ruis, H., additional, Repping, S., additional, van der Veen, F., additional, Mochtar, M. H., additional, Sargin, A., additional, Yilmaz, N., additional, Gulerman, C., additional, Guven, A., additional, Polat, B., additional, Ozel, M., additional, Bardakci, Y., additional, Vidal, C., additional, Giles, J., additional, Remohi, J., additional, Pellicer, A., additional, Garrido, N., additional, Javdani, M., additional, Fallahzadeh, H., additional, Davar, R., additional, Sheibani, H., additional, Leary, C., additional, Killick, S., additional, Sturmey, R. G., additional, Kim, S. G., additional, Lee, K. H., additional, Park, I. H., additional, Sun, H. G., additional, Lee, J. H., additional, Kim, Y. Y., additional, Choi, E. M., additional, Van Loendersloot, L. L., additional, Van Wely, M., additional, Bossuyt, P. M. M., additional, Van Der Veen, F., additional, Roychoudhury Sarkar, M., additional, Roy, D., additional, Sahu, R., additional, Bhattacharya, J., additional, Eguiluz Gutierrez- Barquin, I., additional, Sanchez Sanchez, V., additional, Torres Afonso, A., additional, Alvarez Sanchez, M., additional, De Leon Socorro, S., additional, Molina Cabrillana, J., additional, Seara Fernandez, S., additional, Garcia Hernandez, J. A., additional, Ozkan, Z. S., additional, Simsek, M., additional, Kumbak, B., additional, Atilgan, R., additional, Sapmaz, E., additional, Agirregoikoa, J. A., additional, DePablo, J. L., additional, Abanto, E., additional, Gonzalez, M., additional, Anarte, C., additional, Barrenetxea, G., additional, Aleyasin, A., additional, Mahdavi, A., additional, Agha Hosseini, M., additional, Safdarian, L., additional, Fallahi, P., additional, Bahmaee, F., additional, Sarikaya, E., additional, Segawa, T., additional, Teramoto, S., additional, Tsuchiyama, S., additional, Miyauchi, O., additional, Watanabe, Y., additional, Ohkubo, T., additional, Shozu, M., additional, Ishikawa, H., additional, Yelian, F., additional, Papaioannou, S., additional, Knowles, T., additional, Aslam, M., additional, Milnes, R., additional, Takashima, A., additional, Takeshita, N., additional, Kinoshita, T., additional, Chapman, M. G., additional, Kilani, S., additional, Dadras, N., additional, Parsanezhad, M. E., additional, Zolghadri, J., additional, Younesi, M., additional, Floehr, J., additional, Dietzel, E., additional, Wessling, J., additional, Neulen, J., additional, Rosing, B., additional, Tan, S., additional, Jahnen-Dechent, W., additional, Lee, K. S., additional, Joo, J. K., additional, Son, J. B., additional, Joo, B. S., additional, Risquez, F., additional, Confino, E., additional, Llavaneras, F., additional, Marval, I., additional, D'Ommar, G., additional, Gil, M., additional, Risquez, M., additional, Lozano, L., additional, Paublini, A., additional, Piras, M., additional, Risquez, A., additional, Prochazka, R., additional, Blaha, M., additional, Nemcova, L., additional, Weghofer, A., additional, Kim, A., additional, Barad, D. H., additional, Gleicher, N., additional, Kilic, Y., additional, Ergun, B., additional, Howard, B., additional, Weiss, H., additional, Doody, K., additional, Schafer, C., additional, Ensslen, S., additional, Denecke, B., additional, Veitinger, T., additional, Spehr, M., additional, Tropartz, T., additional, Tolba, R., additional, Egert, A., additional, Schorle, H., additional, Alanya, S., additional, and Yumru, H., additional

Published
2012
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37. Fully LabVIEW-Powered Mössbauer Spectrometer.

Author

Pechousek, J., Prochazka, R., Jancik, D., and Mashlan, M.

Subjects
SOFTWARE synthesizers, SPECTROMETERS, OSCILLOSCOPES, ELECTRONIC instruments, GAMMA ray spectrometry
Abstract

The virtual instrumentation techniques are applied for the first fully-LabVIEW powered Mössbauer spectrometer. The spectrometer application has to carry out several different tasks such as γ-ray pulse height analysis (via digital oscilloscope), reference velocity signal generation for the motion of the radioactive source (via function generator) together with digital proportional-integral-derivative (PID) unit responsible to control the relative precise velocity between the source and the absorber (via CompactRIO) and Mössbauer spectra accumulation. [ABSTRACT FROM AUTHOR]

Published
2009
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49. Investigation of hold period influence on residual fatigue live in steam turbine shaft design

Author

Rund, M, Prochazka, R, Dzugan, J, Konopik, P, Nesladek, M, Jurenka, J, Ruzicka, M, and Mest, P

Abstract

Growth of share renewables in the field of electric power supplier and a lack of mechanism to cover shortage, force standard supplier of energy to stabilize the electrical grid. This situation is then demonstrated by increase of hot-start and cold-starts. But there is a lack for robust tool for qualitative assessment of residual life of the turbine shaft and for design of such a component. The goal of this paper is to present influence of the holding period on low-cycle fatigue (LCF), thermo-mechanical fatigue (TMF) and the so called Damage Operator Approach (DOA) by Nagode, which were used as a new approach for design of turbine shaft in Doosan Skoda Power.

Published
2018

50. Strain controlled cyclic tests on miniaturized specimens

Author

Prochazka, R and Dzugan, J

Abstract

The paper is dealing with strain controlled cyclic tests using a non-contact strain measurement based on digital image correlation techniques on proportional sizes of conventional specimens. The cyclic behaviour of 34CrNiMo6 high-strength steel was investigated on miniaturized round specimens with diameter of 2mm that were compared with specimens in accordance with ASTM E606 standards. The cycle asymmetry coefficient was R= -1. This application is intended to be used for life time assessment of in service components in future work which enables to carried out a group of mechanical tests from a limited amount of the experimental material. The attention was paid to confirm the suitability of the proposed size miniaturization geometry, testing set up and procedure. The test results obtained enabled to construct Manson-Coffin curves and assess fatigue parameters. The purpose of this study is to present differences between cyclic curves and cyclic parameters which have been evaluated based on conventional and miniaturized specimens.

Published
2017

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