Thermal vibrational convection in near-critical fluids. Part 2. Weakly non-uniform heating

The governing equations and effective boundary conditions to describe thermal vibrational convection in a near-critical fluid are derived with the help of the multiple-scale method and averaging procedure. In contrast to Part 1, this paper focuses on the effects of density non-homogeneities caused not by external heating but by vibrational and gravity stratifications due to the divergent mechanical compressibility of near-critical media. It is shown that vibrations generate non-homogeneities in the average temperature, which result in the onset of thermal convection even under isothermal boundary conditions. An agreement with the results of previous numerical and asymptotical analyses and with experiments is found.<br/

Russian conservatism: outlines of a responsible political course

The article deals with the development of conservatism in modern Russian society. The current socio-political situation indicates that Russian society refuses to accept liberal Western values, giving preference to values of a conservative nature. There is an obvious demand for conservative projects to consider the values of social justice, the greater social orientation of the state, the rules and orders that are significant for people and have been with them for decades. The Russian elites are still poorly aware of the possibilities of reflecting such a request and remain within the framework of their usual ideological and conceptual approaches. The article outlines the main problem areas of Russian conservatism, which include the lack of a conservative view on the economy, a certain degree of closeness of conservatism to society, and an upset balance between renewal and preservation. Modern Russia needs to develop a new traditionalist-conservative doctrine as a possible methodology for the development of the entire Russian society, a new, broader, Russian conservatism. It is necessary to develop own “language”, taking into account civilizational, cultural and socio-historical features

Test beam studies of the TRD prototype filled with different gas mixtures based on Xe, Kr, and Ar

Towards the end of LHC Run1, gas leaks were observed in some parts of the Transition Radiation Tracker (TRT) of ATLAS. Due to these leaks, primary Xenon based gas mixture was replaced with Argon based mixture in various parts. Test-beam studies with a dedicated Transition Radiation Detector (TRD) prototype were carried out in 2015 in order to understand transition radiation performance with mixtures based on Argon and Krypton. We present and discuss the results of these test-beam studies with different active gas compositions.Comment: 5 pages,12 figures, The 2nd International Conference on Particle Physics and Astrophysics (ICPPA-2016); Acknowledgments section correcte

Some results of test beam studies of Transition Radiation Detector prototypes at CERN

Operating conditions and challenging demands of present and future accelerator experiments result in new requirements on detector systems. There are many ongoing activities aimed to develop new technologies and to improve the properties of detectors based on existing technologies. Our work is dedicated to development of Transition Radiation Detectors (TRD) suitable for different applications. In this paper results obtained in beam tests at SPS accelerator at CERN with the TRD prototype based on straw technology are presented. TRD performance was studied as a function of thickness of the transition radiation radiator and working gas mixture pressure

MODERN METHODS OF TREATING DISEASES OF THE BULBO-MEMBRANOUS PART OF URETHRA

Strictures of the bulbous-membranous urethra are a common cause of obstructive urination disorder. Modern trends in the development of medicine lead to a wider application of endoscopic method, a more frequent cause of iatrogenic injury of the urethra. At present, conservative, endourologic and reconstructive methods of care are used to treat urethral strictures. There are several conservative, endourological and reconstructive methods for treating patients with urethral stricture. Conservative methods include interventions that do not involve the destruction of urethral stricture or its reconstruction, such as stenting, blind dilatation, and recanalization of the urethra. Performing blind dilatation strictures of the bulbo-membranous urethra is not recommended because of the high risk of false path formation and low efficiency. Endourological operations refer to surgical methods of care and suggest the natural restoration of urethral tissues after the destruction of stricture. Because of the low effectiveness of correction of strictures of the posterior urethra (more than 90 % of relapses in five years), this method is a variant of temporary or palliative care. Currently, two approaches to the reconstruction of the bulbo-membranous urethra are used: anastomotic and replacement operations. Anastomotic surgery involves excision of the affected area and juxtaposition of healthy urethral tissues without tension. Replacement plastic allows to restore patency of the urethra by increasing the diameter of the lumen due to the implantation of various grafts. The article shows that, based on international clinical studies, the most effective method of reconstructing the bulbomembranous urethra is reconstructive surgical methods

Multivortex Solutions of the Weierstrass Representation

The connection between the complex Sine and Sinh-Gordon equations on the complex plane associated with a Weierstrass type system and the possibility of construction of several classes of multivortex solutions is discussed in detail. We perform the Painlev\'e test and analyse the possibility of deriving the B\"acklund transformation from the singularity analysis of the complex Sine-Gordon equation. We make use of the analysis using the known relations for the Painlev\'{e} equations to construct explicit formulae in terms of the Umemura polynomials which are $\tau$-functions for rational solutions of the third Painlev\'{e} equation. New classes of multivortex solutions of a Weierstrass system are obtained through the use of this proposed procedure. Some physical applications are mentioned in the area of the vortex Higgs model when the complex Sine-Gordon equation is reduced to coupled Riccati equations.Comment: 27 pages LaTeX2e, 1 encapsulated Postscript figur

Drop motion during mass transfer accompanied by interphase convection

The article deals with the experimental study of the mass transfer of acetic acid from the dispersed phase (butyl acetate) to the continuous phase (water). The experiments were carried out on a laboratory column with single floating drops. The presence of the Marangoni effect during the movement of drops and its influence on the trajectories of movement of drops and the kinetics of mass transfer during extraction are shown. The influence of the Marangoni effect is most clearly observed when the driving force of the process is 0.1...0.2 mol/l

The enhanced recovery program in urology. Systematic review and meta-analysis

A systematic review and meta-analysis of data on the problem of enhanced recovery in urology was performed. Inclusion criteria – clinical trials of the enhanced recovery program in urology.The aim of the study was to assess the significance of the enhanced recovery program (ERP) in the provision of surgical care in the “urology” profile.Materials and methods. The systematic review was performed according to the guidelines for the presentation of systematic reviews and meta-analyses by PRISMA. The registration number in the international system Prospero was received (CRD42022358982). The review included 364 studies. Studies in urologic oncology were excluded from the meta-analysis. The meta-analysis included 15 studies involving 2293 subjects. A comparison was made between the application of ERP and the standard treatment protocol.Results. The use of ERP leads to an expected two-fold reduction in the duration of postoperative length of hospitalization (OR = –1.96; 95% CI: –2.56÷–1.36; p &lt; 0.00001). The reduction in the duration of hospitalization with the use of ERP in urology does not lead to the increased risk of readmission or re-operation (p = 0.35). The risks of developing postoperative complications ≥ Class 2 by Clavien – Dindo classification were comparable in both groups (p = 0.13). The use of ERP increases the expected success of the treatment by 1.74 times (OR = 1.74; 95% CI: 1.08–2.79; p = 0.02). With the use of ERP in reconstructive urology, a significantly lower risk of complications was established (p = 0.02).Conclusion. The ERP program allows you to reduce the time and cost of treatment, reduce the likelihood of re-hospitalization and achieve better treatment results. The use of ERP is not accompanied by increased risk of complications &gt; Class 2