Results 21 to 30 of about 20,657 (228)

Optimal Power Allocation Algorithm for Multi-Mode OFDM-OAM Communication Systems in Multipath Channel

open access: yesIEEE Access, 2020
Vortex wave carrying orbital angular momentum (OAM), an important property of electromagnetic wave, has bridged a new way to achieve high-capacity radio-frequency communications using different OAM-modes.
Mingzhe Qu   +4 more
doaj   +1 more source

Portals to Knowledge: CD-ROM Encyclopaedias, with Specific Reference to Microsoft Encarta 99 Encyclopedia

open access: yesLexikos, 2012
The close interaction between linguistics and lexicography over the last few decades has had many good effects, not least of which has been the development of a theoretical framework or meta lexicography.
Phillip Adriaan Louw
doaj   +1 more source

Experimentation in caves painting (A comparative analysis)

open access: yesالاكاديمي, 2016
Addressed the problem of the research is marked (experimentation in caves fee) concept and its role in experimentation deviate Display Num formal charges caves.
Fareed Khalid Alwan
doaj   +1 more source

Generation of optimal trajectories for Earth hybrid pole sitters [PDF]

open access: yes, 2011
A pole-sitter orbit is a closed path that is constantly above one of the Earth's poles, by means of continuous low thrust. This work proposes to hybridize solar sail propulsion and solar electric propulsion (SEP) on the same spacecraft, to enable such a ...
Colin R. McInnes   +5 more
core   +1 more source

Sustainable development and scientific research in outer space

open access: yes, 2022
The interpretation of the ”interest of mankind” principle has led, first, to the adoption of the Moon Agreement and, at the same time, brought to its defeat.
De Maestri Maria Elena
core  

Expression capable library for studies of Neisseria gonorrhoeae, version 1.0 [PDF]

open access: yes, 2005
Background The sexually transmitted disease, gonorrhea, is a serious health problem in developed as well as in developing countries, for which treatment continues to be a challenge.
Weyand, Nathan J.   +56 more
core   +1 more source

A Comparative Study of the Concept of Individuated Man in Masnavi's “Hosh-Raba Fortress” and Shakespeare's King Lear [PDF]

open access: yesمطالعات بین‌رشته‌ای ادبیات، هنر و علوم انسانی
From Jung's point of view, the process of individuation is a kind of maturation and psychological development during which the center of personality shifts from "I" to the "Self".
maryam dabaghian   +3 more
doaj   +1 more source

Macro-microscopic Calculation of Five-dimensional Potential Energy Surface for 234U Fission

open access: yesYuanzineng kexue jishu, 2022
A key question about the fission process of a heavy nucleus is to probe the nuclear potential energy landscape and its evolution from the single groundstate compound nucleus over the top of the fission barrier and further to the scission point, finally ...
ZHU Xin;WANG Zhiming;LUO Changkai;NI Lei;ZHONG Chunlai;FAN Tieshuan
doaj  

Designing Polymer Nanocomposites for X‐Ray Shielding: Mechanisms, Architectures, and Scalable Processing

open access: yesAdvanced Engineering Materials, EarlyView.
This review highlights advances in lightweight, lead‐free polymer nanocomposites for diagnostic X‐ray shielding. By linking filler chemistry, dispersion, architecture, and photon interaction mechanisms, it establishes structure–performance relationships guiding material design.
Aklilu G. Messele   +2 more
wiley   +1 more source

A Genetic Algorithm for the Waitable Time-Varying Multi-Depot Green Vehicle Routing Problem

open access: yes, 2023
In an era where people in the world are concerned about environmental issues, companies must reduce distribution costs while minimizing the pollution generated during the distribution process.
Chien-Ming Chen   +3 more
core   +1 more source

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