Results 11 to 20 of about 4,295,535 (295)

Construction Algorithm for Adaptive Morphological Structuring Elements Based on the Neighborhood Gray Difference Changing Vector Field and Relative Density

open access: yesIEEE Access, 2020
Structuring elements of fixed shape and size are used in most conventional mathematical morphology operations, which makes the border of image targets shift, produces new image artifacts and loses small image objects due to the diversity and complexity ...
Chao Fang   +3 more
doaj   +1 more source

On Sums of Sets of Primes with Positive Relative Density [PDF]

open access: yes, 2010
In this paper we show that if $A$ is a subset of the primes with positive relative density $\delta$, then $A+A$ must have positive upper density $C_1\delta e^{-C_2(\log(1/\delta))^{2/3}(\log\log(1/\delta))^{1/3}}$ in $\mathbb{N}$.
Chipeniuk, Karsten, Hamel, Mariah
core   +1 more source

Lattice Structure Design Method Aimed at Energy Absorption Performance Based on Bionic Design

open access: yesMachines, 2022
To obtain the lattice structure with excellent energy absorption performance, the structure of loofah inner fiber is studied to develop bionic design of lattice structure by experiment and simulation analysis method. From the compression experiment about
Gang He   +5 more
doaj   +1 more source

Experimental Study of Enlarged Base Pile under Tension Load in Sand [PDF]

open access: yesJournal of Engineering Research - Egypt, 2022
Important aspects of foundation design include developing an understanding of the behaviour of enlarged base piles and aiming to predict their capacities when subjected to uplift loads.
Ahmed nasr   +2 more
doaj   +1 more source

Projection Pursuit through $\Phi$-Divergence Minimisation [PDF]

open access: yes, 2010
Consider a defined density on a set of very large dimension. It is quite difficult to find an estimate of this density from a data set. However, it is possible through a projection pursuit methodology to solve this problem.
Azé   +11 more
core   +1 more source

A study on damage evolution in Cu-TiO2 composite fabricated at different temperatures and strain rates

open access: yesMaterials Research Express, 2021
Copper/Titanium Dioxide (CuTiO _2 ) samples were fabricated at three temperatures (450 °C, 650 °C, 850 °C) using: a universal testing machine (quasi-statically at the strain rate of 8 × 10 ^–3 s ^−1 ), a drop Hammer (dynamically at the strain rate of ...
S S Jafari, G H Majzoobi
doaj   +1 more source

Inferring the Coronal Density Irregularity from EUV Spectra [PDF]

open access: yes, 2016
Understanding the density structure of the solar corona is important for modeling both coronal heating and the solar wind. Direct measurements are difficult because of line-of-sight integration and possible unresolved structures.
Hahn, Michael, Savin, Daniel Wolf
core   +3 more sources

Characterization of physical properties of tissue factor–containing microvesicles and a comparison of ultracentrifuge-based recovery procedures

open access: yesJournal of Extracellular Vesicles, 2014
Microvesicles were isolated from the conditioned media of 3 cell lines (MDA-MB-231, AsPC-1 and A375) by ultracentrifugation at a range of relative centrifugal forces, and the tissue factor (TF) protein and activity, microvesicle number, size distribution
Camille Ettelaie   +3 more
doaj   +1 more source

The laboratory calibration of a soil moisture capacitance probe in sandy soils

open access: yesSoil and Water Research, 2020
Determining and mitigating landslide risk is a technical-scientific objective, particularly for the protection and proper territorial management and planning.
Marina Campora   +4 more
doaj   +1 more source

Experimental investigation on evolution process of suffusion in gap-graded cohesionless soil

open access: yesYantu gongcheng xuebao, 2023
The suffusion involves selective erosion and gradual migration of fine particles through the voids of soil skeleton formed by coarse particles under seepage flow. As a result, redistribution of soil skeleton stress and deformation of soil may be induced.
ZHANG Liangliang 1, 2, DENG Gang 1, 3, CHEN Rui 1, 2, ZHANG Yinqi 3, LUO Zhiyuan 1, 2
doaj   +1 more source

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