Results 41 to 50 of about 46,285 (150)

Aerial Anchors Positioning for Reliable RSS-Based Outdoor Localization in Urban Environments

open access: yes, 2017
In this letter, the localization of terrestrial nodes when unmanned aerial vehicles (UAVs) are used as base stations is investigated. Particularly, a novel localization scenario based on received signal strength (RSS) from terrestrial nodes is introduced.
Azari, Mohammad Mahdi   +3 more
core   +1 more source

Atmospheric Secondary Particles In Near Earth Space [PDF]

open access: yes, 2000
The Alpha Magnetic Spectrometer detects a large amount of particles below rigidity cutoff. Those high energy particles create questions related to radiation belts and atmospheric neutrinos. To understand the origin of these particles, we use a trajectory
Huang, Ming-Huey A.
core   +2 more sources

A strong triangle inequality in hyperbolic geometry [PDF]

open access: yes, 2015
For a triangle in the hyperbolic plane, let $\alpha,\beta,\gamma$ denote the angles opposite the sides $a,b,c$, respectively. Also, let $h$ be the height of the altitude to side $c$.
Biró, Csaba, Powers, Robert C.
core   +1 more source

Irradiance level and elevation shape the soil microbiome communities of Coffea arabica L.

open access: yesEnvironmental Microbiome
Background The nexus plant-microbe-environment is essential to understand the ecosystem processes shaping plant health and fitness. Within this triangle, soils and associated microflora are among the key ecosystem’s drivers, underpinning plant ...
Inocência da Piedade E. Tapaça   +9 more
doaj   +1 more source

Analysis of Environmental Factors with Dengue Hemorrhagic Fever in Guntur, Demak, Indonesia

open access: yesJournal of Community Medicine and Public Health Research
Guntur district is one of the districts that is classified as endemic for dengue fever in Demak, Indonesia. In the last three years, there have been consecutive cases or deaths due to Dengue Hemorrhagic Fever (DHF).
Fika Hariyanti, Mursid Raharjo, Tri Joko
doaj   +1 more source

Cabri's role in the task of proving within the activity of building part of an axiomatic system [PDF]

open access: yes, 2007
We want to show how we use the software Cabri, in a Geometry class for preservice mathematics teachers, in the process of building part of an axiomatic system of Euclidean Geometry.
Camargo, Leonor   +2 more
core  

Splitting Technique in the Neolithic Toda-1 Grotto (Southern Uzbekistan)

open access: yesАрхеология евразийских степей
The article is devoted to the results of studying the technique of splitting the stone industry of the newly discovered Neolithic site Toda-1 in the south of Uzbekistan in 2016.
Bakhtiyor K. Sayfullaev   +3 more
doaj   +1 more source

New Findings in Old Geometry: Using Triangle Centers to Create Similar or Congruent Triangles [PDF]

open access: yes, 2016
The Euler line of a triangle passes through several important points, including three specific triangle centers: the centroid, orthocenter, and circumcenter.
Capaldi, Mindy B, Lezark, Kathryn E
core   +1 more source

Cellular-Enabled UAV Communication: Trajectory Optimization Under Connectivity Constraint

open access: yes, 2017
In this paper, we study a cellular-enabled unmanned aerial vehicle (UAV) communication system consisting of one UAV and multiple ground base stations (GBSs).
Zeng, Yong, Zhang, Rui, Zhang, Shuowen
core   +1 more source

Design, characterization, and fabrication of solar-retroreflective cool-wall materials [PDF]

open access: yes, 2020
Raising urban albedo increases the fraction of incident sunlight returned to outer space, cooling cities and their buildings. We evaluated the angular distribution of solar radiation incident on exterior walls in 17 U S.
Berdahl, P   +5 more
core  

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