Results 21 to 30 of about 14,613,539 (249)

Experimental study on the influence of the shape and size specimen and the type of cement used on the conversion factors of compressive strength of concrete specimens [PDF]

open access: yesJournal of Structural and Construction Engineering, 2020
Compressive strength test of concrete is one of the most important tests for controlling the quality of concrete in construction structures and, moulds with different shapes and dimensions (cubic and cylindrical) are used to provide experimental ...
Baitollah Badarloo, mahboobeh pirizadeh
doaj   +1 more source

Full-disc 13CO(1–0) mapping across nearby galaxies of the EMPIRE survey and the CO-to-H2 conversion factor [PDF]

open access: yes, 2018
Carbon monoxide (CO) provides crucial information about the molecular gas properties of galaxies. While $^{12}$CO has been targeted extensively, isotopologues such as $^{13}$CO have the advantage of being less optically thick and observations have ...
D. Cormier   +18 more
semanticscholar   +1 more source

Analysis of Iron Oxide Reduction Kinetics in the Nanometric Scale Using Hydrogen

open access: yesNanomaterials, 2020
Iron nanopowder could be used as a sintering aid to water-atomised steel powder to improve the sintered density of metallurgical (PM) compacts. For the sintering process to be efficient, the inevitable surface oxide on the nanopowder must be reduced at ...
Swathi K. Manchili   +3 more
doaj   +1 more source

A Study on the Rational Requirement Area Estimation of Municipal Sewage Treatment Facilities Using Statistical Techniques

open access: yes대한환경공학회지, 2020
Objectives:In this study, a adjusted sewage & wastewater treatment capacity-required area estimation methodology was proposed through various data analysis for the required area of domestic sewage & wastewater treatment, the occupancy ratio of each sub ...
No-Suk Park, Jeong Ik Oh, Sukmin Yoon
doaj   +1 more source

Primary Energy Factors for Electricity Production in Europe

open access: yesEnergies, 2022
The European Union (EU) has committed to supporting the United Nations’ efforts in line with the Paris Agreement for addressing climate change and has set ambitious targets to reduce primary energy consumption and emissions. Similar commitments have also
Constantinos A. Balaras   +3 more
doaj   +1 more source

Conversion of Peripheral CD4+CD25− Naive T Cells to CD4+CD25+ Regulatory T Cells by TGF-β Induction of Transcription Factor Foxp3

open access: yesJournal of Experimental Medicine, 2003
CD4+CD25+ regulatory T cells (Treg) are instrumental in the maintenance of immunological tolerance. One critical question is whether Treg can only be generated in the thymus or can differentiate from peripheral CD4+CD25− naive T cells.
Wanjun Chen   +7 more
semanticscholar   +1 more source

Determination of conversion factors for pine and spruce logs in stacks

open access: yesLeśne Prace Badawcze, 2019
The aim of this article was to determine the conversion factors for stacked pine and spruce logs with a length of 3–6 m. To this end, we measured stacks and their logs of a total of 3322.12 steres of pine logs and 1468.46 steres of spruce logs.
Jodłowski Krzysztof, Witkowska Joanna
doaj   +1 more source

Consistent Approach to Assess the Comfort of Living in the Northern and Arctic Areas [PDF]

open access: yesЭкономика региона, 2018
he numerous publications of the Soviet and post-Soviet periods are devoted to the consequences of the unfavourable impact of natural and climatic conditions on the health and life activity of both the indigenous and incoming population, especially in the
Margarita Nikolaevna Ignatyeva   +1 more
doaj   +1 more source

Laser-assisted Simulation of Dose Rate Effects of Wide Band Gap Semiconductor Devices

open access: yesYuanzineng kexue jishu, 2023
Laser-assisted simulation technique has played a crucial role in the investigation of dose rate effects of silicon-based devices and integrated circuits, due to its exceptional advantages in terms of flexibility, safety, convenience, and precision.
TANG Ge1,2;XIAO Yao1;SUN Peng3;LIU Jingrui1;ZHANG Fuwang1;LI Mo2,*
doaj   +1 more source

The New PWV Conversion Models Based on GNSS and Meteorological Elements in the China Region

open access: yesAtmosphere, 2022
To address the problems of cumbersome processes, large data, and error accumulation in the calculation of conventional GNSS precipitable water volume (PWV), the multi-factor PWV conversion models were established using the multiple linear regression ...
Li Li, Xun Wang, Yun Wei, Hao Wang
doaj   +1 more source

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