نتایج جستجو برای: repose angle
تعداد نتایج: 131357 فیلتر نتایج به سال:
This is an introductory course into some aspects of the physics of granular materials. Three theoretical questions are looked into more detail corresponding to the three hours of the course: I present some statistical models to describe the shape of a heap under impact and present a way to calculate the angle of repose from the first principle. The second part contains the theoretical framework...
In the present study, gelatin microspheres containing ofloxacin were prepared by coacervation phase separation method and characterized by optical microscopy and scanning electron microscopy. The microspheres were analyzed for drug entrapment, bulk density, angle of repose, particle size and In-vitro release pattern. The effect of process variables on microsphere size was studied and based on t...
The use of capsules in Indonesian society is quite widely used because they only have attractive shapes and colors. Capsules are considered to help patients who do not take medicine the taste good or tends be bitter. In this study, researchers tried make two formulations compare effect differences percentage PVP on results physical preparation evaluation test amoxicillin capsules. tests carried...
We consider the impact of the effective gravitational acceleration g{eff} on gravity-driven granular shear flow utilizing a tumbler of radius R rotating at angular velocity omega when g{eff} is varied up to 25 times the gravitational level on Earth in a large centrifuge. The Froude number Fr=omega{2}R/g{eff} is shown to be the proper scaling to characterize the effect of gravity on the angle of...
Theophylline controlled release matrix tablets were prepared with guar gum in two ratios and with three different hardness of 5, 6 and 7 kg/cm. Theophylline controlled release granules were prepared and evaluated for the angle of repose, bulk density, tapped density, compressibility index and Hausners ratio. All the formulation showed good flow properties. The compressed tablets were evaluated ...
The study investigates ibuprofen with wax-like properties as a multifunctional agent (as an active component and as a melt binder). Binding efficiency was compared with granules prepared by wet granulation using polyvinylpyrollidone (PVP K-30) as a binder for micromeritic, physical and mechanical properties such as angle of repose, particle size distribution Carr's index, Hausner's ratio, crush...
Wind blowing over sand on Earth produces decimeter-wavelength ripples and hundred-meter- to kilometer-wavelength dunes: bedforms of two distinct size modes. Observations from the Mars Science Laboratory Curiosity rover and the Mars Reconnaissance Orbiter reveal that Mars hosts a third stable wind-driven bedform, with meter-scale wavelengths. These bedforms are spatially uniform in size and typi...
The continuum description of granular flows is still a challenge despite their importance in many geophysical and industrial applications. We extend previous works, which have explored steady flow properties, by focusing on unsteady flows accelerating or decelerating down an inclined plane in the simple shear configuration. We solve the flow kinematics analytically, including predictions of evo...
To gain a better understanding of the surfaces of planets and small bodies in the solar system, the flow behavior of granular material for various gravity levels is of utmost interest. We performed a set of reduced-gravity measurements to analyze the flow behavior of granular matter with a quasi-2D hourglass under coarse-vacuum conditions and with a tilting avalanche box. We used the Bremen dro...
Discrete numerical simulations are performed to study the evolution of the microstructure and the response of a granular packing during successive loading-unloading cycles, consisting of quasistatic rotations in the gravity field between opposite inclination angles. We show that internal variables--e.g., stress and fabric of the pile--exhibit hysteresis during these cycles due to the exploratio...
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