LABORATORY TESTING THE COMBINED ELONGATE STRUCTURAL ELEMENTS OF SUPPORT OF A MINE OPENING

The stress-strain state of test specimens of the new combined structure of support of a mine opening under loads is studied. The test specimens are compound modular elements of the designed earlier combined structure of support. Every single modular element is the triangular prism, consisting of a reinforced concrete slab and a steel grid made of tube web members. The slab and web members are grouped in a complete element while concreting the slab. The tension sensor’s method of experimental investigation is applied to the testing specimens. Tests of specimens are carried out under the load forced with cargoes. Loads are set in the ways that to simulate service conditions, counting the most adverse. Design features of the support and test specimens are shown. Particulars of the support and its elements, production technology, assemblies as well as the sizes are briefly described. The methodology of testing specimens, as well as the analysis of the outcomes, are presente.

Experimental study on reducing temperature using modular system for vegetation walls made of perlite concrete

The aim of this research is to examine and analyse the thermal characteristics of the fa?ade modular element. The possibility of optimization of the fa?ade coating with vegetation is examined experimentally in this research, with the aim of improving the thermal characteristics of the fa?ade wall. This element is made of perlite concrete in which the greenery is implanted. The scope of the research is experimental and theoretical testing the possibility for optimizing the fa?ade coating with vegetation. The energy specificities of modular vegetation elements and their contribution to the improvement of the thermal properties of the fa?ade wall are analysed in the experimental part of the research, the elements of vegetation are treated as the elements which influence the decrease in surface temperature of the fa?ade coating. The modular elements in this research are placed on a reference wall surface facing the South. The methodology presented in this paper is based on the study of climate characteristics in city of Belgrade, experimental measurements of test models, and comparative analysis with the reference wall. During the experiment, the data on the external climate parameters and the coefficient of heat transfer through the wall were continuously measured. Conducted measurements and analyses show the vegetation influence on the reduction in surface temperature of the outer wall and the heat passage through the fa?ade coating. The experiment used a modular model and several plant species. It is noticeable that vegetative walls with green areas covered by plant shells play an important role in the harmonization of the parameters of the microclimate in relation to the local environment.

Integration on algebraic quantum groupoids

In this paper, we develop a theory of integration on algebraic quantum groupoids in the form of regular multiplier Hopf algebroids, and establish the main properties of integrals obtained by Van Daele for algebraic quantum groups before — faithfulness, uniqueness up to scaling, existence of a modular element and existence of a modular automorphism — for algebraic quantum groupoids under reasonable assumptions. The approach to integration developed in this paper forms the basis for the extension of Pontrjagin duality to algebraic quantum groupoids, and for the passage from algebraic quantum groupoids to operator-algebraic completions, which both will be studied in separate papers.

Phase Control of a Bio-Inspired Meta-Structural Locomotion Robot

This research investigates the rectilinear locomotion of a meta-structural robot inspired by the earthworm. First of all, an equivalent multi-segment model of the meta-structural locomotion robot is derived. By the method of averaging, the robot’s average steady-state velocity is obtained, which is a function of the phase differences among segments. Then a novel locomotion control scheme of adjusting actuation phases is proposed for the robot. It is shown that such control of the phase differences among actuators can significantly tailor not only the magnitude but also the direction of the robot’s average steady-state velocity. Locomotion tests with equal phase difference among segments are carried out on the robot prototype in a horizontal pipe. The predicted phase-velocity relationship is verified, and it is shown that the proposed control is more effective than the more traditional peristaltic locomotion gaits. The presented earthworm-like robot belongs to the general class of metastructures, the concept of synthesizing adaptive structures via modular element design and integration. This study lays the foundation for understanding and advancing the properties of such meta-structural locomotion robots.

Safety in the housing of horses

Safety within an equestrian facility is given also by the sizes of the places in which horses are lodged. The stalls are considered to be the basic modular element of breeding and hosting places, but in Italy there are no specific references about the most appropriate surface related both to different breeds and safety of the workers taking care of them. We sought to determine the size of individual spaces, based on the height at the withers of horses, and to formulate a specific forming and informing course for employees on the likely risks of contact which could generate traumatic events.