Recent research advances in the dynamic behavior of shells: 1989–2000, Part 2: Homogeneous shells

Структура населения и динамика численности пауков учебного участка Сибирского ботанического сада Томского государственного университета

Aim: to compare the mid-term results of treatment of patients with acute attack of moderate and severe ulcerative colitis receiving standard anti-inflammatory therapy and integrated anti-inflammatory therapy using allogeneic culture of mesenchymal stem cells of bone marrow. Materials and methods. Patients with acute attack of ulcerative colitis were divided into two groups. The first group of patients with UC (n=12) in addition to standard anti-inflammatory therapy, received the culture of mesenchymal stem cells (MSC). The second group of patients (n=10) received standard anti-inflammatory therapy with 5-aminosalicylic acid (5-ASA) and glucocorticosteroids (GCS). The clinical activity of UC was assessed on a scale D. Rachmilewitz endoscopic picture was assessed on a scale of Mayo. The duration of remission in groups of patients was estimated by the method of Kaplan-Meier. Results. The original index of Rachmilevitz and the index of Mayo in both groups were comparable. In a year from the start of the study, the risk of recurrence of ulcerative colitis, duration of remission, indices of clinical and endoscopic activity in both groups of patients were comparable. After two years, the effectiveness of anti-inflammatory therapy on major indicators was higher in the group of patients treated with MSC. However, after 3 years of follow-up in both groups clinical and endoscopic indices showed no significant differences. Conclusion. The introduction of a culture of MSC increases the effectiveness of anti-inflammatory therapy in patients with acute attack of ulcerative colitis, increases the duration of disease remission, reduces to 3 times the risk of attack within 2 years of observation

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Применение мезенхимальных стволовых клеток костного мозга в лечении больных с острой атакой язвенного колита

Recent research effort into some aspects of strength, static stability, and structural optimization of horizontal pressure vessels is reviewed in this paper. Stress concentrations at the junction of cylinder-ellipsoidal end closures are covered in detail. This in turn establishes efficient choices for wall thicknesses in the vessel. Detailed account of stresses for flexible supports of a horizontal cylindrical shell is provided. Dimensions of support components, which assure the minimum stress concentrations between a horizontal shell and its support, are calculated. In particular, the wall thickness is found for vessels being loaded by the weight of its content and placed on two supports. Stability issues are also reviewed in this paper. In particular, attention is paid to the stability of cylinder under external pressure and to the stability of end closures. The latter are loaded by internal or external pressure. Apart from buckling and plastic loads, the ultimate load carrying capacity, i.e., burst pressure, for internally pressurized heads is also examined. On a practical side, aboveground and underground cases are discussed. In the latter case of underground vessels the reinforcement by internal rings is assessed. The optimization part of this paper deals with the effective choice of the end closure depth and the shape of its meridian. The overriding aim here is to examine the stress concentrations and the ways in which they can be mitigated. The optimal shape of closures is also searched for, with respect to the maximum buckling pressure for a given mass of the head. In the case of internal pressure the maximum of plastic load is sought within a specified class of meridional profiles. Finally, optimal sizing of whole vessels is discussed for slender and compact geometries. Extensive references are made to relatively recent and ongoing work related to the above topics. This paper has 287 references and 50 figures.

Strength, Stability, and Optimization of Pressure Vessels: Review of Selected Problems

Experimental Perspective on the Buckling of Pressure Vessel Components

Ruled surfaces- Surfaces of revolution- Translation surfaces- Monge's surfaces- Continuous topographic and topographic surfaces- Surfaces of congruent cross sections- Continuous topographic and topographic surfaces- Helical surfaces- Spiral surfaces- Spiral-shaped surfaces- Helix-shaped surface- One-sided surfaces- Surfaces with spherical director curve- Weingarten surfaces- Surfaces of constant total curvature- Surfaces of constant mean curvature- Wave-shaped, waving, and corrugated surfaces- Surfaces of umbrella type- Kinematical surfaces of general type- Second order surfaces- Algebraic surfaces of high orders- Quasi-polyhedra- Equidistants of double systems

Encyclopedia of analytical surfaces

Beams in Bending. Beam Elements. Beam Systems. Finite Elements for Cross-Sectional Analysis. Saint-Venant Torsion. Beams Under Transverse Shear Loads. Restrained Warping of Beams. Analysis of Stress. Rational B-Spline Curves. Shape Optimization of Thin-Walled Sections. Appendix A: Using the Computer Programs. Appendix B: Numerical Examples.

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Analysis and Design of Elastic Beams: Computational Methods

The principal advances in the design and construction, as well as the static, vibrational, and buckling analysis of thin-walled structures and buildings in the shape of general and axisymmetric ellipsoidal shells are summarized in this review. These shells are particularly useful as internally pressurized vessels or as heads and bottoms of cylindrical tanks and vessels. Reinforced concrete and structural steel domes of buildings, air-supported rubber-fabric shells, and underwater pressure vessels are also made in the form of ellipsoidal, shells. Knowing the geometry of ellipsoids, one can solve various problems in physics, optics, and so on. Basic results of theoretical and experimental investigations of the stress-strain state, buckling, and natural and forced vibrations contained in 209 references are presented in the review. The influence of temperature on the stress-strain state of the shells in question is also discussed. Some parts of the review are also devoted to an analysis of the literature on the stress-strain state of ellipsoidal and torispherical heads of pressure vessels with openings.

S. N. Krivoshapko

Papers

Encyclopedia of analytical surfaces

Analysis and Design of Elastic Beams: Computational Methods

Research on General and Axisymmetric Ellipsoidal Shells Used as Domes, Pressure Vessels, and Tanks

Static, vibration, and buckling analyses and applications to one-sheet hyperboloidal shells of revolution

Design of Plate and Shell Structures