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ACS Applied Materials and Interfaces, 2021
Polymer membranes with excellent thermomechanical properties and good gas separation performance are desirable for efficient CO2 separation. A series of copolyimide membranes are prepared for the first time using PIM-PI-1, a hard segment with high CO2 ...
Iqubal Hossain +5 more
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Polymer membranes with excellent thermomechanical properties and good gas separation performance are desirable for efficient CO2 separation. A series of copolyimide membranes are prepared for the first time using PIM-PI-1, a hard segment with high CO2 ...
Iqubal Hossain +5 more
semanticscholar +1 more source
Lectures on Artin Groups and the K(\pi ,1) Conjecture
, 2014This paper consists of the notes of a mini-course (3 lectures) on Artin groups that focuses on a central question of the subject, the \(K(\pi ,1)\) conjecture.
L. Paris
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Printed Circuit Board Inspection System PI/1
SPIE Proceedings, 1989An automatic printed circuit board (PCB) inspection system called PI/1, is described in this paper. The system can inspect PCB artwork and inner layers to find trace faults such as open circuits, short circuits, pin holes, fine lines and narrow line spaces. PI/1 uses a line scan camera with 1024 pixels resolution to take images.
Shiaw-Shian Yu +2 more
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Type Pi 1–2 magnetic field pulsations
Space Science Reviews, 1981The relationships of type Pi (broadband) pulsations to various other substorm-related phenomena are reviewed. Several of the more popular mechanisms for the origin of Pi activity are discussed in the light of the observations. There is only one mechanism in sight that tentatively accounts for observed characteristics of Pi 1–2 activity at auroral oval ...
R. R. Heacock, R. Hunsucker
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Cellular Signalling, 2019
Inactivation of glutathione S-transferase pi 1 (GSTP1) via hypermethylation is an early and common event in prostate carcinogenesis. Functional inactivation of GSTP1 increases the susceptibility to oxidative stress and enhance progression risk of the ...
Ling Zhang +7 more
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Inactivation of glutathione S-transferase pi 1 (GSTP1) via hypermethylation is an early and common event in prostate carcinogenesis. Functional inactivation of GSTP1 increases the susceptibility to oxidative stress and enhance progression risk of the ...
Ling Zhang +7 more
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A method for proving Ramanujan’s series for $$1/\pi $$1/π
The Ramanujan journal, 2018In a famous paper of 1914 Ramanujan gave a list of 17 extraordinary formulas for the number $$1/\pi $$1/π. In this paper we explain a general method to prove them, based on some ideas of James Wan and some of our own ideas.
Jesús Guillera
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The K(Pi, 1)-conjecture for the affine braid groups
2003The authors prove that the complement of the hyperplane arrangement associated to the complexified action of a Euclidean reflection group of type \(\widetilde A_n\) is a \(K(\pi,1)\) space. This is done using the fact that the associated affine braid group \(\widetilde{\mathcal A}\) can be embedded in a finite type Artin braid group.
Charney, Ruth, Peifer, David
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An ionospheric origin for Pi 1 micropulsations
Planetary and Space Science, 1976Abstract Cosmic noise absorption pulsation events observed with fast response riometers at Macquarie Island in the southern auroral zone have almost always been accompanied by Pi 1 micropulsations. A cross-spectral analysis of fast response riometer data and vertical component induction magnetometer data for one such event showed that, after the low ...
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SMOOTH KNOTS IN A MANIFOLD OF HOMOTOPY TYPE $ K(\pi,1)$
Mathematics of the USSR-Izvestiya, 1975The author studies the set of smooth isotopy classes of embeddings of a sphere in a manifold having homotopy type , where . He obtains an explicit expression for in terms of the group and the well-known Haefliger groups of knots and finite links of the sphere in?.Bibliography: 7 items.
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