This paper presents a concept and a technical analysis of a co-generation power set with a combustion engine powered by syngas produced in the process of wood waste gasification. The set is composed of a wood waste gas generator fitted with a filter system, a combustion engine, a current generator and heat exchangers. The foundations of the gasification process are described together with the most common solutions used worldwide. Moreover, the methods of adapting spark-ignition and compression-ignition engines to be powered by syngas produced in the wood waste gasification process are presented. The advantages of the presented solution and its possible applications in industry are shown. The assumed technical parameters of the set are as follows: mechanical-electrical energy -200 kWh, heat recovered from the gasifier -250 kWh, heat recovered from the engine -200 kWh. The concept and design of the module cogeneration set is the effect of actions taken by the Institute of Automobiles and Internal Combustion Engines and by the Institute of Thermal Power Engineering of the Cracow University of Technology.
A retrospective analysis of the results of pre-operative use of rifaximin was performed in 181 patients scheduled for rectal and colorectal cancer between 2013 and 2016 in the General Surgery Unit with the Orthopedic and Urology in the Hospital of the Ministry of Interior and Administration in Lublin. Patients undergoing urgent surgery were excluded from the study. Patients were divided into 2 groups. The first group of 139 patients - patients operated on for rectal and colorectal cancer in 2013 until 2015, in whom rifaximine was not used in the preoperative period. The second group is 42 patients, operated on in 2016, in which the rifaximin was used in the pre-operative period at a dose of 2x2 tablets (400 mg) per day, 12-hour interval, for 7 days before the planned operation. Additionally, a probiotic was administered for 7 days. Drugs were ordained at the Oncological Outpatient Clinic as part of the pre-hospitalization check. R esults: The use of rifaximin in the preoperative period in patients with colorectal cancer had an effect on shortening the time of post-operative hospitalization and reduced post-surgical pain in comparison with the control group. The analysis of the cynumber and intensity of surgical complications in both groups did not differ. C onclusions: Large studies on the influence of rifaximin on the development of colorectal cancer have not been published so far. Only single reports suggest that its use has a positive effect on the perioperative period of patients treated for colorectal cancer including rectum and our retrospective analysis confirms these observations.
This article presents a theoretical model for dry, lowvelocity, and wear-less friction based on a single asperity interaction with arbitrary assumed adhesion forces and elastic deformations of the microasperities. Simulations of friction behavior according to the single asperity interaction, as well as the interaction of multiplied single models, are presented. The multiplied model assumes a regular distribution of the single asperities, arbitrarily chosen geometrical properties (based on harmonic function), and elastomechanical properties of the cooperating materials. In the proposed model, the adhesion as a function of asperity deformation is introduced. This enables the simulation of an expedient local coefficient of friction. The model assumes no breaking of the contact between single asperities; however, the proposed model enables detection of such a situation. The results obtained by simulation of the model show both qualitative and quantitative agreement with the known types of friction force dynamic behavior, in particular, nonlinearity of the friction coefficient. At this level of investigation, the model assumes the most important relations connected with its properties, which need further refinement and elaboration, especially according to assumed asperity properties.
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