The paper presents new value-added composite materials prepared by recycling tire rubber, polyethene terephthalate (PET), high-density polyethene (HDPE), wood sawdust, and fly ash. The composites were manufactured through the compression molding technique for three temperatures (150 °C, 160 °C, and 190 °C) previously optimized. The addition of fly ash as reinforcement in polymer blends is a viable route to improve the composite” properties. The paper aims to assess the effect of fly ash on the mechanical properties and water stability of the new all waste composites considering their applications as outdoor products. The static tensile (stress-strain behavior) and compression properties of the composites were tested. The fly ash composites were characterized in terms of wetting behavior and surface energies (contact angle measurements); chemical structure of the new interface developed between composite” components (FTIR analysis), crystalline structure (XRD analysis), surface morphology and topography (SEM, AFM). The addition of fly ash promoted the development of the hybrid interfaces in the new composites, as FTIR analysis has shown, which, in turn, greatly improved the mechanical and water resistance. The novel all waste composites exhibited lower surface energies, larger contact angles, and smoother morphologies when compared to those with no fly ash. Overall, the study results have revealed that fly ash has improved the mechanical strength and water stability of the composites through the formation of strong hybrid interfaces. The study results show optimal water stability and tensile strength for 0.5% fly ash composites cured at 190 °C and optimal compressive strength with good water stability for 1% fly ash composite cured at 150 °C.
The paper presents the comparative study regarding the turbidity removal using aluminium sulphate Al 2 (SO4) 3 *18H 2 O and polyaluminum chlorides, Al n (OH) m Cl 3n-m , commercial name, Sachtoklarr 39, in water treatment plant from Covasna City. The parameters that influence the treatment process and the efficiency of turbidity removal were studied. The water characteristic parameters of Basca Mare and Covasna rivers-the two sources of water alimentation for Covasna water treatment plant were monitored along the year 2007. The turbidity varied from small values admitted by legislation during the winter months up to 753,8 NTU for Basca Mare river and up to 1076 NTU for Covasna river during June with abundant rain and flooding. The efficiency of turbidity removal was much better for polyaluminum chlorides comparatively to aluminium sulphate.
Abstract. In this paper, we present the first steps in the process of the modeling in ADAMS MBS of MSC software of the mechanical system of an articulated robot, with six revolute joints. The geometric 3D CAD model of the robot, identical to the real model, in the PARASOLID format, is imported into ADAMS/View and then are presented the necessary steps for building the kinematic model of the robot. We conducted this work, in order to help us in our future research, which will consist of kinematic and dynamic analysis and optimization of the robot motion.
Poster Sessions lattices and establishes that indeed fluorine has a directing influence in molecular assembly. In order to evaluate the propensity of interactions in halogens in general ortho chloro and ortho bromo anilines were crystallized from their respective liquids via in situ cryocrystallization method. The crystal structures are isostructural belonging to a trigonal system, space group P 31. The crystal packing is due to intramolecular N-H...Cl or Br and intermolecular N-H...N hydrogen bonds. However, in the case of ortho bromo aninline short Br...Br contacts (3.64 Å) are observed suggesting that this interaction is a consequence of the size of Br atom.
In this paper, we present the process of kinematic modeling and simulation, in ADAMS MBS of MSC software, of an articulated robot with six revolute joints, through direct and inverse kinematics. First, by using the STEP function, we define a spatial trajectory of the end effector, and, through inverse kinematics, we determine the motion laws of the six revolute joints. Then, we apply the inverse process on another virtual model of the same robot, by imposing the motion laws to the joints, to obtain the desired trajectory of the end effector, through direct kinematics. This work is a small part of our research regarding modeling and optimization of the industrial robots’ motion.
In the context in which, the dynamic behavior and performance of industrial robots are very important for their general performance, we present, in this article, a short dynamic analysis of an industrial robot. First, on the base of a short review of some papers on this topic, a general presentation of some main concepts regarding the dynamics of the industrial robots, and of the actual importance of the virtual prototyping in studying the dynamic behavior and performance of such complex mechanical systems are highlighted. How the modern virtual prototyping tools allow better, more rapid, and less costly dynamic designing of the complex mechanical systems, comparing to the traditional designing and prototyping, and ADAMS MBS of MSC software enables the evaluation of the dynamic behavior of the virtual prototype of a robot during its designing stage, by starting from the kinematic model previously developed, we conducted in this research the process of dynamic modeling and simulation of a 6R articulated robot developed in ADAMS and a short dynamical analysis of it.
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