Results 71 to 80 of about 60,182 (167)

Algebraic Properties of Semi-Direct Sums of Rings

Annales Mathematicae Silesianae
Let R be an associative ring not necessarily with unity. We say that R is a semi-direct sum of rings S and I, if R = S + I, where S is a subring of a ring R, I is an ideal of R and S ∩ I = {0}.
Nowakowska Marta
doaj   +1 more source

Self-reported removal and expulsion of the dapivirine vaginal ring: qualitative reports from female ring users and their male partners in the Ring Study (IPM 027)

BMC Public Health
Background/aims The dapivirine vaginal ring is a self-administered, women-initiated, discreet, long-acting HIV-1 prevention option for women. It was found to be safe and effective in healthy HIV-negative women who adhered to product use instructions, and
Cecilia Milford, Hariska Ramlal, Rorisang Mofokeng, Letitia Rambally Greener, Annaléne Nel, Jennifer Smit, Mariëtte Malherbe   +6 more
doaj   +1 more source

High aspect ratio silicon ring-shape micropillars fabricated by deep reactive ion etching with sacrificial structures

Micro and Nano Engineering
This paper presents the fabrication of widely-spaced high aspect ratio ring-shape pillars (i.e. hollow pillars). Lateral etching of the pillars during deep reactive ion etching is challenging.
Wenhan Hu, Zihao Wang, Aixi Pan, Bo Cui
doaj   +1 more source

Effects of clean fracturing fluids on coal microstructure and coalbed gas adsorption

Scientific Reports
Nowadays, some fracking fluids can enable resourceful extraction of coalbed methane and reduce greenhouse gas emissions. However, their toxicity or corrosiveness will cause harm to downhole workers and pollute groundwater resources.
Qian Zhang, Feng Cai, Haotian Xie, Yu Fang   +3 more
doaj   +1 more source

On the Clean Graph of Commutative Artinian Rings

International Journal of Mathematics and Mathematical Sciences
For a commutative Artinian ring R with unity, the clean graph ClR is a graph with vertices in the form of an ordered pair e,u, where e is an idempotent and u is a unit of ring R, respectively.
R. Singh, M. Habibi, S. C. Patekar
doaj   +1 more source

On weakly f-clean rings

Quasigroups and Related Systems
Let R be an associative ring with identity and Id(R) and K(R) denote the set of idempotents and full elements of R respectively. The notion of weakly f-clean rings where element r can be written as r = f + e or r = f − e, e ∈ Id(R) and f ∈ K(R) was introduced. Different properties of weakly f-clean rings were studied. It was shown that a left quasi-duo
openaire   +3 more sources

Sigma B regulated motility and chemotaxis in Bacillus cereus. [PDF]

Microbiology (Reading)
Huijboom L, Tempelaars M, Boeren S, van der Linden E, Habibi M, Shaebani R, Abee T.   +6 more
europepmc   +1 more source

Next-gen geothermal could bring clean power to much more of the planet. [PDF]

Proc Natl Acad Sci U S A
Battersby S.
europepmc   +1 more source

Experimental and numerical study on waterproofing performance and leakage mechanism of bell-and-spigot joints in prefabricated utility tunnels. [PDF]

Sci Rep
Zhai CJ, Wu MF, Hu XD, Zhou MS, Zhong JR.   +4 more
europepmc   +1 more source

Surgical Induction of Mid-Thoracic Aortic Coarctation in Mice: A Reproducible Preclinical Model of Pressure-Induced Vascular Remodeling. [PDF]

Curr Protoc
Lauver DA, Garver H, Kreiger-Burke T, Rendón CJ, Contreras GA, Watts SW, Fink GD.   +6 more
europepmc   +1 more source