Acoustic emission control of tensile and compression defects for plastic carbon fiber samples reinforced with side girders

Tensile and compression tests of composite samples made of carbon fiber reinforced with side girders have been carried out. It was found that the area of active location of acoustic emission (AE) signals corresponds to the destruction of the composite, bolted and glued joints. Destruction of the carbon fiber-reinforced plastic material did not always occur in the area of the fasteners, but the sources of AE signals with the maximum total amplitude were registered in the destruction zones.

Polyharmonic signals and their properties

This article proposes a new approach to signal synthesis to ensure the stealth and safety of active location tools, which improves the efficiency of lighting. The work has been classified complex broadband signals, considered the class of polyharmonic and band signals, their pros and cons, the prospects of application in the systems of location, shows the relationship of their signals with hyperbolic function and generalized range Fibonacci.

Natural convection in a Square Enclosure with Partially Active Vertical Wall

Steady, laminar, natural convection flow in a square enclosure with partially active vertical wall is considered. The enclosure is filled with air and subjected to horizontal temperature gradient. Finite volume method is used to solve the dimensionless governing equations. The physical problem depends on three parameters: Rayleigh number (Ra =103-106), Prandtl number (Pr=0.71), and the aspect ratio of the enclosure (A=1). The active location takes two positions in the left wall: top (T) and middle (M). The main focus of the study is on examining the effect of Rayleigh number on fluid flow and heat transfer rate. The results including the streamlines, isotherm patterns, flow velocity and the average Nusselt number for different values of Ra. The obtained results show that the increase of Ra leads to enhance heat transfer rate. The fluid particles move with greater velocity for higher thermal Rayleigh number. Also by moving the active location from the top to the middle on the left vertical wall, convection and heat transfer rate are more important in case (M). Furthermore for high Rayleigh number (Ra=106), Convection mechanism in (T) case is principally in the top of the enclosure, whereas in the remaining case it covers the entire enclosure.

Geophysical and Geodetical Investigation of A Landslide Area (Koyulhisar-Sivas, Turkey)

This study includes geophysical studies carried out in the last section in the close south of Koyulhisar (Sivas) landslide site. Additionally, the study area is in the most active location where landslide's displacement amount is the highest. The landslide site basically has been examined geophysics (SRT, GPR) and geodesic (GNSS) methods. According to the geophysical results, within ~ 20 m of investigation depth, layers with the average seismic P-wave velocities (VP) of 0.30, 1.00 and 2.00 km/s have been identified. It has been understood that the thickness of the first two layers of these layers from top to the bottom is approximately 3 and 6.5 m, and the last layer with Vp > 2.0 km/s is the bedrock. Furthermore, it has been understood that the depth of the sliding surface which is the upper limit of the bedrock varies between ~ 7–10 m, there are loose units on the sliding surface, the type of sliding is planar sliding, and the direction of sliding is S–SE, the tilt of the layer has the same direction with topography, is SE-oriented and mostly bigger than 50. It was understood that the deformations in the landslide mass were occured from the geological unit, the layer or topography slope and precipitation and the landslide activity can continue in the study area. Thus, it has proven that precipitation and deformations within the layer are effective in triggering the landslide by the geodetic (IDH) observations, and it is understood that they were compatible with the geophysical results. Therefore, the study area contains the risk and the natural hazards, and these threatens the settlement area and the buldings and other constructions there.

“To Infinity and Beyond!”: Inner Tensions in Global Knowledge Infrastructures Lead to Local and Pro-active ‘Location’ Information

We follow two biodiversity knowledge infrastructures that hold conceptual and practical inner tensions, and we argue that some of these diffi culties emerge from overlooking local information and different understandings of the term location. The ambiguity emerges from two basic concepts of space – exogenous and interactionist – that are both necessary yet readily suggest inconsistent practices – global standardization and local fl exibility – to organize location records. Researchers in both infrastructures fi rst standardized, digitized and globalized their records, then discovered inner tensions, and fi nally alternated between globally interoperable and locally fl exible records. Our story suggests a broader lesson: since both types of ‘location’ information are necessary; and since vast resources were already invested in globalizing knowledge infrastructures; then investing in local knowledge infrastructures and in alternating between both types of memory practices seems the most rational option, and a good way to resist epistemic injustice affl icting local knowledge in peripheral localities.Keywords: biodiversity, database, epistemic-injustice