scholarly journals Uma Aplicação do Hexágono Lógico: organizando sistematicamente os conceitos de razão e causalidade [An application of the logical hexagon: a systematic organization of the concepts of reason and causality]

2018 ◽  
Vol 25 (46) ◽  
pp. 151
Author(s):  
Guilherme De Freitas Kubiszeski
Keyword(s):  
Geometrical Structures ◽  
Logical Hexagon ◽  
Logical Reason

Este trabalho tem como objetivo fornecer uma aplicação do hexágono lógico aos conceitos metafísicos de razão e de causalidade. Após uma breve apresentação da abordagem de Blanché, passa-se à construção das estruturas geométricas. Primeiramente, são apresentadas duas tríades – razão lógica, acaso, causa; razão, não-causa, non sequitur. Em seguida, apresenta-se o hexágono lógico como a díade das duas primeiras estruturas. Conclui-se que o hexágono lógico é uma estrutura capaz de organizar sistematicamente os conceitos de razão e de causalidade. [This paper aims to show an application of the logical hexagon to the metaphysical concepts of reason and causality. After a brief presentation of Blanché’s approach, we proceed to build the geometrical structures. First, we show two triads – logical reason, chance, cause; reason, non-cause, non sequitur. Then we present the logical hexagon as a dyad built out of the first two structures. We conclude that the logical hexagon is able to organize the concepts of reason and causality in a systematic way.]

scholarly journals Analysis of Occlusion Effects for Map-Based Self-Localization in Urban Areas

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5196
Author(s):  
Yuki Endo ◽  
Ehsan Javanmardi ◽  
Shunsuke Kamijo
Keyword(s):  
Urban Areas ◽  
Structural Information ◽  
Average Error ◽  
High Definition ◽  
Geometrical Structures ◽  
Real Environment ◽  
Surrounding Environment ◽  
Localization Errors ◽  
Stable Estimation ◽  
High Level

A high-definition (HD) map provides structural information for map-based self-localization, enabling stable estimation in real environments. In urban areas, there are many obstacles, such as buses, that occlude sensor observations, resulting in self-localization errors. However, most of the existing HD map-based self-localization evaluations do not consider sudden significant errors due to obstacles. Instead, they evaluate this in terms of average error over estimated trajectories in an environment with few occlusions. This study evaluated the effects of self-localization estimation on occlusion with synthetically generated obstacles in a real environment. Various patterns of synthetic occlusion enabled the analyses of the effects of self-localization error from various angles. Our experiments showed various characteristics that locations susceptible to obstacles have. For example, we found that occlusion in intersections tends to increase self-localization errors. In addition, we analyzed the geometrical structures of a surrounding environment in high-level error cases and low-level error cases with occlusions. As a result, we suggested the concept that the real environment should have to achieve robust self-localization under occlusion conditions.

scholarly journals Doping the Buckminsterfullerene by Substitution: Density Functional Theory Studies of C59X (X = B, N, Al, Si, P, Ga, Ge, and As)

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Hongcun Bai ◽  
Wenxin Ji ◽  
Xiangyu Liu ◽  
Liqiong Wang ◽  
Nini Yuan ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Physical Properties ◽  
Density Functional ◽  
Dielectric Constants ◽  
Geometrical Structures ◽  
Functional Theory ◽  
Relative Stabilities ◽  
As Doping ◽  
Quantum Chemistry Calculations ◽  
Heteroatom Substitution

The heterofullerenes C59X (X = B, N, Al, Si, P, Ga, Ge, and As) were investigated by quantum chemistry calculations based on density functional theory. These hybrid cages can be seen as doping the buckminsterfullerene by heteroatom substitution. The geometrical structures, relative stabilities, electronic properties, vibrational frequencies, dielectric constants, and aromaticities of the doped cages were studied systemically and compared with those of the pristine C60cage. It is found that the doped cages with different heteroatoms exhibit various electronic, vibrational, and aromatic properties. These results imply the possibility to modulate the physical properties of these fullerene-based materials by tuning substitution elements.

Chiral Molecular Cavities of Calix[4]Crown on Au(111)

2008 ◽  
Vol 8 (11) ◽  
pp. 5702-5707 ◽  
Author(s):  
Ge-Bo Pan ◽  
Jun Luo ◽  
Qi-Yu Zheng ◽  
Li-Jun Wan
Keyword(s):  
Self Assembly ◽  
Chiral Recognition ◽  
Scanning Tunneling ◽  
Racemic Mixture ◽  
Tunneling Microscopy ◽  
Geometrical Structures ◽  
Simple Method ◽  
Ordered Structures ◽  
Ordered Arrays ◽  
Stm Images

Well-ordered arrays of chiral molecular cavities have been constructed by self-assembly of inherently chiral calix[4]crown on Au(111) in 0.1 M HClO4 solution and investigated by scanning tunneling microscopy (STM). The chiral features are clearly observed in high resolution STM images. It is found that the adsorption of the two enantiomers results in the same ordered structures with upright orientation on Au(111). Moreover, only phase separation has been observed for the racemic mixture of the two enantiomers in the experiment. This is mainly due to the weak molecule-substrate interaction as well as asymmetric geometrical structures of the two enantiomers. The present study provides a simple method for construction of ordered arrays of chiral molecular cavities, which are of potential in chemical sensors, chiral recognition, and nonlinear optics.

Geometrical structures and spectra of corannulene and icosahedral c60

Tetrahedron ◽  
1986 ◽  
Vol 42 (23) ◽  
pp. 6437-6442 ◽  
Author(s):  
Masahiro Kataoka ◽  
Takeshi Nakajima
Keyword(s):  
Geometrical Structures

Exploring the geometrical structures of X©BnHnm [(X, m) = (B, +1), (C, +2) for n = 5; (X, m) = (Be, 0), (B, +1) for n = 6] by an electronic method

2015 ◽  
Vol 39 (11) ◽  
pp. 8630-8637 ◽  
Author(s):  
Jianhua Hou ◽  
Ying Chen ◽  
Qian Duan ◽  
Qingcheng Liang ◽  
Dayong Jiang ◽  
...  
Keyword(s):  
Geometrical Structures ◽  
Electronic Method

The (quasi-)planar wheel-type structures can be obtained by adding electrons.

scholarly journals Ice-edge detection from Japanese C-band radar and high-frequency radar coastal stations

2013 ◽  
Vol 54 (62) ◽  
pp. 59-64 ◽  
Author(s):  
K. Shirasawa ◽  
N. Ebuchi ◽  
M. Leppäranta ◽  
T. Takatsuka
Keyword(s):  
Sea Ice ◽  
Edge Detection ◽  
High Frequency ◽  
Open Water ◽  
Radar Data ◽  
Hf Radar ◽  
Sea Surface ◽  
Geometrical Structures ◽  
Overlapping Data ◽  
Ice Edge

AbstractA C-band sea-ice radar (SIR) network system was operated to monitor the sea-ice conditions off the Okhotsk Sea coast of northern Hokkaido, Japan, from 1969 to 2004. The system was based on three radar stations, which were capable of continuously monitoring the sea surface as far as 60 km offshore along a 250 km long coastal section. In 2004 the SIR system was closed down and a sea surface monitoring programme was commenced using high-frequency (HF) radar; this system provides information on surface currents in open-water conditions, while areas with ‘no signal’ can be identified as sea ice. The present study compares HF radar data with SIR data to evaluate their feasibility for sea-ice remote sensing. The period of overlapping data was 1.5 months. The results show that HF radar information can be utilized for ice-edge mapping although it cannot fully compensate for the loss of the SIR system. In particular, HF radar does not provide ice concentration, ice roughness and geometrical structures or ice kinematics. The probability of ice-edge detection by HF radar was 0.9 and the correlation of the ice-edge distance between the radars was 0.7.

Ab initio study of geometrical structures of SiH3–XH silanes

2000 ◽  
Vol 528 (1-3) ◽  
pp. 269-285 ◽  
Author(s):  
M. Alcolea Palafox ◽  
P.C. Gómez ◽  
L.F. Pacios
Keyword(s):  
Ab Initio ◽  
Ab Initio Study ◽  
Geometrical Structures

Geometry of Poisson Structures

1995 ◽  
Vol 2 (4) ◽  
pp. 347-359
Author(s):  
Z. Giunashvili
Keyword(s):  
Poisson Structure ◽  
Poisson Structures ◽  
Geometrical Structures

Abstract The purpose of this paper is to consider certain mechanisms of the emergence of Poisson structures on a manifold. We shall also establish some properties of the bivector field that defines a Poisson structure and investigate geometrical structures on the manifold induced by such fields. Further, we shall touch upon the dualism between bivector fields and differential 2-forms.

scholarly journals Unmanned Aerial Vehicle Recognition Based on Clustering by Fast Search and Find of Density Peaks (CFSFDP) with Polarimetric Decomposition

Electronics ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 364 ◽  
Author(s):  
Hao Wu ◽  
Bo Pang ◽  
Dahai Dai ◽  
Jiani Wu ◽  
Xuesong Wang
Keyword(s):  
Decomposition Methods ◽  
Polarization Property ◽  
Geometrical Structures ◽  
Fast Search ◽  
Vehicle Recognition ◽  
Radar Images ◽  
Density Peaks ◽  
Aerial Vehicle ◽  
Polarization Characteristics

Unmanned aerial vehicles (UAV) have become vital targets in civilian and military fields. However, the polarization characteristics are rarely studied. This paper studies the polarization property of UAVs via the fusion of three polarimetric decomposition methods. A novel algorithm is presented to classify and recognize UAVs automatically which includes a clustering method proposed in “Science”, one of the top journals in academia. Firstly, the selection of the imaging algorithm ensures the quality of the radar images. Secondly, local geometrical structures of UAVs can be extracted based on Pauli, Krogager, and Cameron polarimetric decomposition. Finally, the proposed algorithm with clustering by fast search and find of density peaks (CFSFDP) has been demonstrated to be better than the original methods under the various noise conditions with the fusion of three polarimetric decomposition methods.

Sign in / Sign up

Export Citation Format

Share Document