This paper proposes a method for quickly estimating the average flotation capacity of minerals according to the kinetic experiment without finding the flotation spectrum at which the first moments of ...distribution are calculated by the coefficients of the polynomial approximation of the logarithmic form of the kinetics. Using the example of copper-nickel ore, it is shown that the application of this method is effective in the multiparameter problem of comparative assessment of reagents. The ten parameters assessed included the average floatability of the target minerals (chalcopyrite and pentlandite), pyrrhotite and rock; the flotation selectivity coefficients of target minerals relative to pyrrhotite and rock; and the levels of copper and nickel losses from bulk flotation tailings. A visual representation of the interdependencies of parameters is achieved using diagrams showing the effect of flotation reagents on groups of parameters: average flotation, selectivity coefficients, metal losses, and selectivity relative to rock. The influence of butyl xanthate, Aeroflot, diesel fuel, and waste rock depressants—carboxymethyl cellulose (CMC) and acidified water glass (with a total consumption of 130 g/t collectors, 5–10 g/t diesel fuel, 200 g/t CMC, acidified water glass—500 g/t)—on the estimated parameters under conditions of collective flotation is determined. It is found that the addition of Aeroflot and diesel fuel to the main reagent collector xanthate increases the selectivity of pentlandite and chalcopyrite flotation relative to pyrrhotite and rock-forming component. The introduction of acidified liquid glass into the reagent mode increases the selectivity of the flotation of nickel and copper sulfides relative to the rock. CMC additives impair the selectivity of copper flotation. The quantitative effects of each individual parameter are taken into account in the integral rating assessment of the prospects of using reagent combinations for copper-nickel ore in terms of a set of ten parameters. The proposed method can be further used for a mass comparative evaluation of flotation reagents.
Presently, the improvement in the quality of life of patients who underwent a laparoscopic surgical repair of hiatus hernia and the absence of the gastroesophageal reflux disease (GERD) recurrence ...are the basic characteristics of the surgical treatment. In this connection, further perfection of the tactics and techniques of the surgical GERD treatment becomes an important problem of modern surgery.
Here, we present a comparative analysis of the remote results of the surgical treatment of 159 patients with GERD-complicated hiatus hernia. The patients were divided into two groups, depending on the technique of the performed endosurgical treatment. The first group consisted of patients operated via the standard laparoscopic Nissen fundoplication. In the second group, we included those patients who underwent surgical treatment using a modified procedure of Nissen fundoplication with the formation of a non-tension cuff (RF patent No. 2529415 of 27.09.2014).
Evaluation of the results, based on the survey questionnaires Gerd-Q, GSRS, SF-36 and the data of instrumental research methods, was performed 1 to 5 years post-treatment.
The treatment of the GERD-complicated hiatus hernia patients with application of the technique of forming a non-hanging fundoplication cuff shows the best long-term results: the incidence of the reflux syndrome and signs of hyperfunction of the fundoplication cuff is lower. The revealed differences coincide with the data of the Gerd-Q and GSRS questionnaires, as well as the life quality estimation by the SF-36 questionnaire. The developed techniques do not require application of sophisticated technical skills and re-equipment and may be recommended for the practical use in the everyday practice in surgical hospitals of all levels.
Obesity is an additional high-risk factor in the development of thromboembolic complications (TEC) in the surgical treatment. 110 cases of obese patients who underwent a treatment at the Surgical ...Department from January, 2015 to March, 2018. Prior to the operation, all the patients received a medication to prevent thromboembolic complications, while intermittent pneumocompression was applied during the surgery. The use of intermittent pneumocompression of the lower extremities in the laparoscopic surgical treatment of obese patients reduces the amount of venous thromboembolic complications via normalization of the intravenous haemodynamics
In order to identify the advantages of the original modification of Nissen fundoplication techniques and identify the safest mash material for prosthetic reinforcement of hiatal closure, was made ...analysis of early postoperative complications in 121 patients with hiatal hernia.The formation of the non tension fundoplication reduces the level of early postoperative complications. The usage of biological prosthesis has the advantage in comparison with synthetic ones. In general, the usage of mashes significantly increases the severity of the complaints of patients after the intervention, but most of them are within 3-14 days of the postoperative period.
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