The annular foam breaker is one which uses the vacuum and shear force generated by the Coanda effect to break foam. Its effectiveness in destroying drilling foam has been test in wellbore flow simulation loop experimental stand. Experimental results showed that the operating pressure of the annular foam breaker should be larger than 0.6MPa and the stabilizers concentration of the foam drilling ...

Hollow sections are most suitable for welded connections between members. The welding procedure is fairly straightforward in RHS, because they do not require profiling which is necessary for circular hollow sections. Although many multiplanar and uniplanar joints in structures are present, limited evidence is available for the fatigue behaviour of joints made of rectangular hollow sections. Thi...

The bremsstrahlung of accelerated electrons passing through a converter is used to study multiparticle photonuclear reactions. results calculations, numerical modeling, design, and testing special magnetic cleaning system obtain “pure” beam quanta when studying the cross-sections such reactions at LUE-40 linac are presented. based on commercially available permanent magnets rectangular cross-se...

Nuclei from nearly ripe eggs of Rana pipiens were isolated and cleaned in 0.1 M KCl. The whole nucleus was then digested to various degrees with ribonuclease or trypsin, followed by washing and fixation in either osmium tetroxide or potassium permanganate. The nuclear envelope was dissected off, placed on a grid, air dried, and compared with undigested controls in the electron microscope. Some ...

The paper deals with m by n rectangular arrays whose mn cells are filled with symbols. A section of the array consists of m cells, one from each row and no two from the same column. The paper focuses on the existence of sections that do contain symbols with high multiplicity.

Formation of shock waves has an important role in supercritical flows studies. These waves are often occurring during passage of supercritical flow in the non-prismatic channels. In the present study, the effect of length of contraction wall of open-channel for two different geometries (1.5 m and 0.5 m) and fixed contraction ratio was investigated on hydraulic parameters of shock waves using ex...

Trichophyton rubrum is an anthropophilic fungi and has recently become the most common and widely distributed dermatophyte, isolated of man. The infection usually present as superficial scaling annular patches, but the lesions may involved the extensive area of skin.  A case of multiple cutaneous lesions due to T.rubrum with scaling annular patches and well marginated in much of the skin and in...

This paper discusses the results of computational fluid dynamics simulations carried out for rectangular cylinders with various side ratios of interest for many civil engineering structures. A bridge deck of common cross-section geometry was also considered. Unsteady Reynolds-averaged Navier–Stokes (URANS) equations were solved in conjunction with either an eddy viscosity or a linearized explic...

This study is a work on analyzing the traditional shapes of classrooms. A model is presented that considers the rectangular classroom divided into five sections as a function of two factors: viewing distance and horizontal viewing angle. The reading time and number of errors are affected by both. This model is validated experimentally, and the shape of a trapezoid is suggested for new classrooms.