cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Graphene Nanoribbons: from chemistry to circuits
Creators: name: Tseng, Frank
name: Unluer, Dincer
name: Stan, Mircea R.
name: Ghosh, Avik W.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The Y-chart is a powerful tool for understanding the relationship between various views (behavioral, structural, physical) of a system, at different levels of abstraction, from high-level, architecture and circuits, to low-level, devices and materials. We thus use the Y-chart adapted for graphene to guide the chapter and explore the relationship among the various views and levels of abstraction. We start with the innermost level, namely, the structural and chemical view. The edge chemistry of patterned graphene nanoribbons (GNR) lies intermediate between graphene and benzene, and the corresponding strain lifts the degeneracy that otherwise promotes metallicity in bulk graphene. At the same time, roughness at the edges washes out chiral signatures, making the nanoribbon width the principal arbiter of metallicity. The width-dependent conductivity allows the design of a monolithically patterned wide-narrow-wide all graphene interconnect-channel heterostructure. In a three-terminal incarnation, this geometry exhibits superior electrostatics, a correspondingly benign short-channel effect and a reduction in the contact Schottky barrier through covalent bonding. However, the small bandgaps make the devices transparent to band-to-band tunneling. Increasing the gap with width confinement (or other ways to break the sublattice symmetry) is projected to reduce the mobility even for very pure samples, through a fundamental asymptotic constraint on the bandstructure. An analogous trade-off, ultimately between error rate (reliability) and delay (switching speed) can be projected to persist for all graphitic derivatives. Proceeding thus to a higher level, a compact model is presented to capture the complex nanoribbon circuits, culminating in inverter characteristics, design metrics and layout diagrams.
description: Chapter to be published by Springer Series in Material Science. Title: Graphene Nanoelectronics: Metrology, Synthesis, Properties and Applications. Editor: Hassan Raza
Great Britain Ministry of Information - Daily Press Notices and Bulletins (1941-01-08)
Creators: name: Great Britain. Ministry Of Information.
Publisher: name: The University of Texas at Austin
Year: 1941
Subjects: World War, 1939-1945 – Social aspects
World War, 1939-1945 -- History
World War II
Second World War
World War Two
Great Britain

description: From the UK National Archives: http://www.nationalarchives.gov.uk/theartofwar/inf3.htm “Formed on September 4th 1939, the day after Britain’s declaration of war, the Ministry of Information (MOI) was the central government department responsible for publicity and propaganda in the Second World War. The initial functions of the MOI were threefold: news and press censorship; home publicity; and oversees publicity in Allied and neutral countries”. This collection contains Press Notices and Bulletins published by the MOI between 1939-1945. The Press Notices and Bulletins are among many publications and films issued by the agency during the war.
The role of EROS in T cell biology
Creators: name: Mortimer, Paige Marie
Publisher: name: Imperial College London
Year: 2022

description: EROS (Essential for Reactive Oxygen Species) regulates the protein expression of gp91phox in macrophages and neutrophils. gp91phox is an essential membrane-bound component of the phagocyte NADPH oxidase. If EROS or gp91phox are absent, the primary immunodeficiency Chronic Granulomatous Disease (CGD) develops. CGD in EROS deficient patients has additional autoimmune features compared to gp91phox deficient patients, suggesting further functions of EROS besides gp91phox regulation. EROS also regulates the expression of the ATP-gated purinergic receptor P2X7. gp91phox and P2X7 are both involved in various signalling processes in CD4+ T cells, therefore I hypothesised that EROS may too have an effect on CD4+ T cell biology. This thesis demonstrates that EROS is expressed in CD4+ T cells, and regulates gp91phox and P2X7 expression in these cells. Losing EROS reduces the ATP-driven shedding of CD27, CD62L and IL-6R from the cell surface, and the induction of cell death in CD4+ T cells. EROS deficiency drives Th2 skewing of CD4+ T cells, highlighted by 4-10x fold excess secretion of IL-4, IL-5 and IL-13, and upregulated Rbpj, Plexin d1 and Gata3 expression. P2X7 deficiency or inhibition recapitulates EROS deficiency, but gp91phox deficiency does not, demonstrating that the Th2 phenotype is a P2X7-dependent process. There are more T resident memory (TRM) and Type 2 Innate Lymphoid Cells (ILC2) in EROS deficient mice, however this does not contribute to a more effective Th2-orchestrated immune response. Less IgG1 is secreted in EROS deficient mice, dampening any Th2-driven protection against Helminth parasitic infections. CRISPR-mediated deletion of EROS in human CD4+ T cells demonstrates conservation of function, with decreased P2X7 levels, augmented IL-4 production and impaired surface marker shedding. Overall, this thesis shows that EROS negatively regulates Th2 immune responses in mouse and human CD4+ T cells by upregulating the expression of P2X7.
title: ÐÐ½ÑÑÑÑÐ¼ÐµÐ½Ñ ÑÐµÐ´Ð°ÐºÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð¸Ð½ÑÐµÑÑÐµÑÐ° Ñ Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¸ÐµÐ¼ Ð½ÐµÐ¹ÑÐ¾ÑÐµÑÐµÐ²ÑÑ ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¹
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Editing tool for interior based on neural network technology
Creators: name: ÐÐµÐ½ÑÐºÐ¾Ð²Ð°, Ð®Ð»Ð¸Ð°Ð½Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: ÐÐ¸ÑÐ¾Ð½ (Python)
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android
kotlin
ÐºÐ»Ð¸ÐµÐ½Ñ-ÑÐµÑÐ²ÐµÑ
Ð¼Ð¾Ð±Ð¸Ð»ÑÐ½Ð¾Ðµ Ð¿ÑÐ¸Ð»Ð¾Ð¶ÐµÐ½Ð¸Ðµ
opencv
Ð³Ð»ÑÐ±Ð¾ÐºÐ¾Ðµ Ð¾Ð±ÑÑÐµÐ½Ð¸Ðµ
client-server
mobile application
deep learning

description: ÐÐ°Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° ÑÐ°ÑÑÐ¼Ð°ÑÑÐ¸Ð²Ð°ÐµÑ Ð¿ÑÐ¾ÑÐµÑÑ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ¸ Ð¸Ð½ÑÑÑÑÐ¼ÐµÐ½ÑÐ° ÑÐµÐ´Ð°ÐºÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð² Ð²Ð¸Ð´Ðµ Ð¼Ð¾Ð±Ð¸Ð»ÑÐ½Ð¾Ð³Ð¾ Ð¿ÑÐ¸Ð»Ð¾Ð¶ÐµÐ½Ð¸Ñ Ð¿Ð¾Ð´ Ð¾Ð¿ÐµÑÐ°ÑÐ¸Ð¾Ð½Ð½ÑÑ ÑÐ¸ÑÑÐµÐ¼Ñ Android. ÐÑÐ¸Ð»Ð¾Ð¶ÐµÐ½Ð¸Ðµ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ð¾ Ñ Ð¿Ð¾Ð´Ð´ÐµÑÐ¶ÐºÐ¾Ð¹ ÑÐµÑÐ½Ð¾Ð»Ð¾Ð³Ð¸Ð¹ Ð³Ð»ÑÐ±Ð¾ÐºÐ¾Ð³Ð¾ Ð¾Ð±ÑÑÐµÐ½Ð¸Ñ Ð¸ ÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½Ð¾Ð³Ð¾ Ð·ÑÐµÐ½Ð¸Ñ. Ð¡ Ð¿Ð¾Ð¼Ð¾ÑÑÑ Ð½ÐµÐ³Ð¾ Ð¼Ð¾Ð¶Ð½Ð¾ Ð²ÑÐ¿Ð¾Ð»Ð½Ð¸ÑÑ Ð¿ÑÐµÐ´Ð²Ð°ÑÐ¸ÑÐµÐ»ÑÐ½ÑÐ¹ Ð´Ð¸Ð·Ð°Ð¹Ð½ ÐºÐ¾Ð¼Ð½Ð°ÑÑ Ð¿ÐµÑÐµÐ´ ÑÐµÐ¼Ð¾Ð½ÑÐ¾Ð¼ Ð½Ð° ÑÐ¾ÑÐ¾Ð³ÑÐ°ÑÐ¸Ð¸. ÐÐ°Ð¿ÑÐ¸Ð¼ÐµÑ, Ð²ÑÐ±Ð¸ÑÐ°ÑÑ Ð½Ð¾Ð²ÑÐ¹ ÑÐ²ÐµÑ ÑÑÐµÐ½ Ð¸Ð»Ð¸ Ð½Ð¾Ð²ÑÐµ Ð¾Ð±Ð¾Ð¸, Ð° ÑÐ°ÐºÐ¶Ðµ ÑÐ´Ð°Ð»ÑÑÑ Ð»Ð¸ÑÐ½Ð¸Ðµ ÑÐºÑÐ°ÑÐµÐ½Ð¸Ñ ÑÐ¾ ÑÑÐµÐ½ Ð¸Ð»Ð¸ Ð¿Ð¾Ð»Ð°. Ð¢ÐµÐ¼Ð° ÑÐ²Ð»ÑÐµÑÑÑ Ð°ÐºÑÑÐ°Ð»ÑÐ½Ð¾Ð¹, ÑÐ°Ðº ÐºÐ°Ðº Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ñ ÑÐµÑÐ½Ð¾Ð»Ð¾Ð³Ð¸Ð¸ Ð³Ð»ÑÐ±Ð¾ÐºÐ¾Ð³Ð¾ Ð¾Ð±ÑÑÐµÐ½Ð¸Ñ, ÐºÐ¾ÑÐ¾ÑÑÐµ Ð¸Ð¼ÐµÑÑ Ð±ÑÑÑÑÐ¾Ðµ ÑÐ°Ð·Ð²Ð¸ÑÐ¸Ðµ Ð² Ð½Ð°ÑÑÐ¾ÑÑÐµÐµ Ð²ÑÐµÐ¼Ñ. ÐÑÐ¸Ð»Ð¾Ð¶ÐµÐ½Ð¸Ñ Ð±ÑÐ» ÑÐµÐ°Ð»Ð¸Ð·Ð¾Ð²Ð°Ð½ Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ ÐºÐ»Ð¸ÐµÐ½Ñ-ÑÐµÑÐ²ÐµÑÐ½Ð¾Ð¹ Ð°ÑÑÐ¸ÑÐµÐºÑÑÑÑ. ÐÐ»Ð¸ÐµÐ½Ñ Ð½Ð°Ð¿Ð¸ÑÐ°Ð½ Ð½Ð° ÑÐ·ÑÐºÐµ Kotlin Ð²Ð¼ÐµÑÑÐµ Ñ Ð±Ð¸Ð±Ð»Ð¸Ð¾ÑÐµÐºÐ¾Ð¹ OpenCV, ÑÐµÑÐ²ÐµÑÐ½Ð°Ñ ÑÐ°ÑÑÑ Ð½Ð° ÑÐ·ÑÐºÐµ Python Ñ Ð²Ð»Ð¾Ð¶ÐµÐ½Ð½ÑÐ¼ doker-ÐºÐ¾Ð½ÑÐµÐ¹Ð½ÐµÑÐ½Ð¾Ð¼ Ð¸ Ð½ÐµÐ¹ÑÐ¾ÑÐµÑÑÑ. ÐÑÐ¸Ð»Ð¾Ð¶ÐµÐ½Ð¸Ðµ Ð¿Ð¾ÐºÐ°Ð·Ð°Ð»Ð¾ ÑÐ´Ð¾Ð²Ð»ÐµÑÐ²Ð¾ÑÐ¸ÑÐµÐ»ÑÐ½ÑÐµ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÑ.
description: This work examines the process of developing an editing tool in the form of a mobile application for the Android operating system. The application is developed with support for deep learning technologies and computer vision. You can make a preliminary design of the room before renovation in the photo. For example, choosing a new wall color or new wallpaper, or removing unnecessary decorations from the walls or floor. The topic is relevant, since deep learning technologies are applied, which are currently developing rapidly. The application was implemented using a client-server architecture. The client is written in Kotlin along with the OpenCV library, the server side is in Python with a nested doker container and neural network. The application has shown satisfactory results.
title: ÐÐ¼ÐµÑÐ¸ÐºÐ°Ð½Ð¾-ÐºÐ¸ÑÐ°Ð¹ÑÐºÐ¸Ðµ ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¸Ðµ Ð¾ÑÐ½Ð¾ÑÐµÐ½Ð¸Ñ Ð½Ð° ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½Ð¾Ð¼ ÑÑÐ°Ð¿Ðµ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: American-Chinese economic relations at the present stage
Creators: name: Ð¡ÑÑÐ¸ÑÐ½Ð¾Ð²Ð°, ÐÐ¸Ð»Ð¸Ð°Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2019
Subjects: Ð²Ð½ÐµÑÐ½ÐµÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¸Ðµ Ð¾ÑÐ½Ð¾ÑÐµÐ½Ð¸Ñ
Ð¡Ð¨Ð
ÐÐÐ
ÑÐ¾ÑÐ³Ð¾Ð²Ð°Ñ Ð¿Ð¾Ð»Ð¸ÑÐ¸ÐºÐ°
Ð¸Ð½Ð²ÐµÑÑÐ¸ÑÐ¸Ð¾Ð½Ð½Ð¾Ðµ ÑÐ¾ÑÑÑÐ´Ð½Ð¸ÑÐµÑÑÐ²Ð¾
ÑÐ¾ÑÐ³Ð¾Ð²ÑÐ¹ Ð±Ð°Ð»Ð°Ð½Ñ
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Ð¿ÑÐ¾ÑÐ¸Ð²Ð¾ÑÐµÑÐ¸Ñ Ð²Ð½ÐµÑÐ½ÐµÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¸Ñ Ð¾ÑÐ½Ð¾ÑÐµÐ½Ð¸Ð¹
foreign economic relations
U.S.A
China
trade policy
investment cooperation
trade balance
import
export
WTO
trade war
the contradictions of foreign economic relations

description: ÐÐ°Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° Ð°Ð½Ð°Ð»Ð¸Ð·Ñ Ð²Ð½ÐµÑÐ½ÐµÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¸Ñ Ð¾ÑÐ½Ð¾ÑÐµÐ½Ð¸Ð¹ ÐÐÐ  Ð¸ Ð¡Ð¨Ð Ð½Ð° ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½Ð¾Ð¼ ÑÑÐ°Ð¿Ðµ. ÐÑÐ¸Ð²ÐµÐ´ÐµÐ½Ð¾ ÐºÑÐ°ÑÐºÐ¾Ðµ Ð¾Ð¿Ð¸ÑÐ°Ð½Ð¸Ðµ Ð¸ÑÑÐ¾ÑÐ¸Ð¸ ÑÐ°Ð·Ð²Ð¸ÑÐ¸Ñ ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¸Ñ ÑÐ²ÑÐ·ÐµÐ¹ ÑÑÐ¸Ñ Ð³Ð¾ÑÑÐ´Ð°ÑÑÑÐ². ÐÑÐ´ÐµÐ»ÐµÐ½Ñ Ð²Ð·Ð³Ð»ÑÐ´Ñ Ð¸ ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¸Ðµ ÑÑÑÐ°ÑÐµÐ³Ð¸Ð¸ Ð³Ð»Ð°Ð² ÑÐ°ÑÑÐ¼Ð°ÑÑÐ¸Ð²Ð°ÐµÐ¼ÑÑ Ð³Ð¾ÑÑÐ´Ð°ÑÑÑÐ² Ð¿Ð¾ Ð¾ÑÐ½Ð¾ÑÐµÐ½Ð¸Ñ Ð´ÑÑÐ³ Ðº Ð´ÑÑÐ³Ñ Ð½Ð° ÑÐ°Ð·Ð½ÑÑ ÑÑÐ°Ð¿Ð°Ñ. ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ñ Ð¸ÑÑÐ¾ÐºÐ¸ Ð¿ÑÐ¾ÑÐ¸Ð²Ð¾ÑÐµÑÐ¸Ð¹ Ð² Ð°Ð¼ÐµÑÐ¸ÐºÐ°Ð½Ð¾-ÐºÐ¸ÑÐ°Ð¹ÑÐºÐ¸Ñ ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¸Ñ Ð¾ÑÐ½Ð¾ÑÐµÐ½Ð¸ÑÑ Ñ Ð¸Ñ Ð²ÑÑÐµÐºÐ°ÑÑÐ¸Ð¼Ð¸ Ð¿Ð¾ÑÐ»ÐµÐ´ÑÑÐ²Ð¸ÑÐ¼Ð¸ Ð¿Ð¾ÑÐ»Ðµ 2017 Ð³Ð¾Ð´Ð°. ÐÐ° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð¸Ð·ÑÑÐµÐ½Ð½ÑÑ Ð°ÑÐ¿ÐµÐºÑÐ¾Ð² Ð²Ð½ÐµÑÐ½ÐµÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¾Ð¹ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ Ð´Ð°Ð½Ð° Ð¾ÑÐµÐ½ÐºÐ° ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½Ð¾Ð³Ð¾ ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ñ Ð²Ð½ÐµÑÐ½ÐµÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¸Ñ Ð¾ÑÐ½Ð¾ÑÐµÐ½Ð¸Ð¹ Ð¡Ð¨Ð Ð¸ ÐÐÐ  Ð² ÑÐ¾ÑÐ³Ð¾Ð²Ð¾Ð¼ Ð¸ Ð¸Ð½Ð²ÐµÑÑÐ¸ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¼ ÑÐ¾ÑÑÑÐ´Ð½Ð¸ÑÐµÑÑÐ²Ðµ. ÐÑÐ¾Ð°Ð½Ð°Ð»Ð¸Ð·Ð¸ÑÐ¾Ð²Ð°Ð½Ð° Ð²Ð·Ð°Ð¸Ð¼Ð¾ÑÐ²ÑÐ·Ñ Ð¿ÑÐ¾Ð±Ð»ÐµÐ¼ Ð¸ ÑÐµÐºÑÑÐ¸Ñ ÑÑÐ»Ð¾Ð²Ð¸Ð¹ Ð´Ð²ÑÑÑÐ¾ÑÐ¾Ð½Ð½ÐµÐ¹ Ð²Ð½ÐµÑÐ½ÐµÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¾Ð¹ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ ÐÐÐ  Ð¸ Ð¡Ð¨Ð.
description: This work is devoted to the analysis of foreign economic relations between China and the United States at the present stage. A brief description of the history of economic relations of these States is given. The views of the heads of China and the United States in relation to each other and their economic strategies at different stages are highlighted. The sources of contradictions in the US-China economic relations with their consequences after 2017 are investigated. On the basis of the studied aspects of foreign economic activity the assessment of the current state of foreign economic relations between the USA and China in trade and investment cooperation is given. The interrelation of problems and current conditions of bilateral foreign economic activity of China and the USA is analyzed.
title: Efficient WLAN link simulations by means of EESM
title: Αποτελεσματικές προσομοιώσεις συνδέσμων WLAN μέσω του EESM
Creators: name: Λογοθετης Εμμανουηλ
Publisher: name: Technical University of Crete
Year: 2021

description: The widespread use of wireless local area networks (WLANs) in recent years and the continued need of higher transmission data rates resulted in the fast growth of WLAN systems. The simulation complexity of such systems however is huge. In this thesis, we focus on the IEEE 802.11n standard, which is based on high-throughput (HT) orthogonal frequency-division multiplexing (OFDM), and provide low time-complexity simulations by means of the exponential effective SNR mapping (EESM) method. The EESM method is a fundamental tool for evaluating and studying next generation OFDM-based wireless systems. It maps the set of different SNR values per subcarrier into a single effective flat-fading SNR, at which the system has the same performance. The EESM method is implemented for SISO, SIMO 1x2, and MIMO 2x2 configurations, in conjunction with the IEEE TGn Model-B frequency-selective channel. The simulator is based on the Matlab WLAN Toolbox. Full link simulations are performed to obtain the BER vs post-processing SNR curves for 20MHz channels, which are compared to the curves obtained through the EESM method. Extensive simulations indicate that the low-complexity EESM-based link simulations provide reliable BER vs post-processing SNR estimates. The latter makes EESM acceptable for abstraction in system level simulation to improve time efficiency.
description: Η ευρεία χρήση ασύρματων τοπικών δικτύων (WLAN) τα τελευταία χρόνια και η συνεχιζόμενη ανάγκη για υψηλότερους ρυθμούς μετάδοσης δεδομένων οδήγησαν στη γρήγορη ανάπτυξη των συστημάτων WLAN. Η πολυπλοκότητα προσομοίωσης τέτοιων συστημάτων ωστόσο είναι τεράστια. Σε αυτήν την εργασία, εστιάζουμε στο πρότυπο IEEE 802.11n, το οποίο βασίζεται στην πολυπλεξία ορθογώνιας διαίρεσης συχνοτήτων (OFDM) υψηλής απόδοσης (HT) και παρέχουμε προσομοιώσεις χαμηλής χρονικής πολυπλοκότητας μέσω της μεθόδου exponential effective SNR mapping (EESM). Η μέθοδος EESM είναι ένα θεμελιώδες εργαλείο για την αξιολόγηση και τη μελέτη των ασύρματων συστημάτων της επόμενης γενιάς που βασίζονται σε OFDM. Αντιστοιχίζει το σύνολο των διαφορετικών τιμών SNR ανά υποφορέα σε ένα μόνο flat-fading SNR, στο οποίο το σύστημα έχει την ίδια απόδοση. Η μέθοδος EESM εφαρμόζεται σε συστήματα SISO, SIMO 1x2, και MIMO 2x2, σε συνδυασμό με το μοντέλο καναλιού IEEE TGn Model-B. Η προσομοίωση βασίζεται στο Matlab WLAN Toolbox. Πραγματοποιούνται πλήρεις προσομοιώσεις συνδέσμων για τη λήψη των καμπυλών BER vs post-processing SNR για κανάλια 20MHz, οι οποίες συγκρίνονται με τις καμπύλες που λαμβάνονται μέσω της μεθόδου EESM. Εκτεταμένες προσομοιώσεις υποδεικνύουν ότι οι προσομοιώσεις συνδέσμων χαμηλής πολυπλοκότητας που βασίζονται στο EESM παρέχουν αξιόπιστες εκτιμήσεις BER vs post-processing SNR. Το τελευταίο καθιστά το EESM αποδεκτό για απλοποίηση της προσομοίωσης επιπέδου συστήματος για τη βελτίωση της αποδοτικότητας σε σχέση με τον χρόνο.
Polarisation switching mechanism of a proton transfer ferroelectric
Creators: name: Okenyi, Matthew Tochukwu Osahon
Publisher: name: Imperial College London
Year: 2022

description: Ferroelectricity is a phenomenon which scientists have investigated since its discovery – for its own sake, as well as the practical applications which have been later revealed. Although most research has historically focused on inorganic ferroelectrics such as the perovskites lead zirconate titanate and barium titanate, organic ferroelectrics often possess different characteristics which may inspire novel applications in the future. An important aspect of a ferroelectric’s behaviour is the mechanism by which its polarisation switches in an external field. This thesis describes the development of an effective Hamiltonian to simulate polarisation switching in the organic, proton transfer ferroelectric, croconic acid (CRCA). CRCA is a single-component, room temperature ferroelectric with a large spontaneous polarisation (30 μCcm⁻²). Density functional theory (DFT) was used to map out the potential energy surface (PES) of CRCA from first principles, and to generate the data which was used to train the effective Hamiltonian. The effective Hamiltonian was developed to satisfy translational invariance in a way which allows the molecular degrees of freedom to be coarse-grained. This improves the efficiency with which the effective Hamiltonian can be trained and used relative to previous versions of the method from which our model was adapted. The accuracy of the effective Hamiltonian was verified by calculating the minimum energy path (MEP) of a single unit cell between its two domain states and comparing it to the results of DFT calculations of the MEP. Polarisation switching in the non-activated regime of CRCA was then simulated using the kinetic Monte Carlo method with the effective Hamiltonian. These simulations suggest that the domain wall velocity and the electric field strength follow a linear relationship with a negative intercept. The similarities and differences between this result and the results of previous theoretical studies are considered and discussed.
Intense high-quality medical proton beams via laser fields
Creators: name: Galow, Benjamin J.
name: Harman, Zoltán
name: Keitel, Christoph H.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: During the past decade, the interaction of high-intensity lasers with solid targets has attracted much interest, regarding its potential in accelerating charged particles. In spite of tremendous progress in laser-plasma based acceleration, it is still not clear which particle beam quality will be accessible within the upcoming multi petawatt (1 PW = 10$^{15}$ W) laser generation. Here, we show with simulations based on the coupled relativistic equations of motion that protons stemming from laser-plasma processes can be efficiently post-accelerated using crossed laser beams focused to spot radii of a few laser wavelengths. We demonstrate that the crossed beams produce monoenergetic accelerated protons with kinetic energies $> 200$ MeV, small energy spreads ($\approx$ 1$%$) and high densities as required for hadron cancer therapy. To our knowledge, this is the first scheme allowing for this important application based on an all-optical set-up.
description: 14 pages, 3 figures, 1 table
Design, fabrication and test of the iridium catalysed electrolysis (ICE) thrusters
Creators: name: Muir, Charles
Publisher: name: Imperial College London
Year: 2022

description: The Iridium Catalysed Electrolysis (ICE) thruster concept addresses the growing need for a microscale chemical propulsion system which can cater for the stringent power, propellant and integration requirements of smallsat platforms. In-situ H2/O2 propellant production via water electrolysis is highly suitable for secondary payload satellites especially when direct feed from electrolysers eliminates any requirement for gas phase storage. Two bi-propellant thruster architectures are presented with a common design and fabrication approach but highly disparate design thrust levels of 4.5 mN (ICE-Cube) and 0.7-1.7 N (ICE-200) which each address identified operational and efficiency drawbacks of current electrolysis system architectures. A MEMS-based fabrication approach has been developed and applied in the realisation of each thruster. This includes the qualification of several novel processes, including bulk reactive ion etching of tungsten to etch depths exceeding 500 µm and sputter deposition of iridium onto refractory metal and silicon substrates to serve as an ignition catalyst. This experimentally qualified fabrication process has enabled the realisation of a fully regeneratively cooled thruster chip with a throat width as small as 13 µm and presents an inherently scalable means of manufacturing high-performance, low unit cost chemical thrusters. A representative experimental performance evaluation was carried out on both thrusters supporting the feasibility of the concepts. Cold flow testing demonstrated exceptional Isp efficiencies in both fabricated micronozzles, exceeding 0.93 ± 0.05 for ICE-200 and 0.89 ± 0.08 for ICE-Cube. Hot fire testing provided a representative operational demonstration, with ICE-200 achieving an Isp range between 298.7-388.6 s ± 33.2 s over short duration firing periods and ICE-Cube demonstrating prolonged firing periods exceeding 200 s and an achieved Isp between 181.2-185.4 s ± 32.4 s. This initial performance characterisation has allowed the feasible envelope of microscale electrolysis and bi-propellant thrusters to be widened and provides a validated methodology applicable to design, fabrication and test of these systems.
title: ÐÑÑ Ð¸ÑÐµÐºÑÑÑÐ½ÑÐµ ÑÐµÑÐµÐ½Ð¸Ñ Ð¿ÑÐ¸ ÑÐµÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸Ð¸ Ð¿ÑÐ¾Ð¼ÑÑÐ»ÐµÐ½Ð½Ð¾Ð³Ð¾ Ð·Ð´Ð°Ð½Ð¸Ñ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Ðrchitectural concept for the reconstruction of industrial buildings
Creators: name: ÐÐ°Ð½ÐºÑÐ°ÑÑÐµÐ²Ð°, ÐÐ»ÐµÐºÑÐ°Ð½Ð´ÑÐ°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2019
Subjects: ÐÑÐ¾Ð¼ÑÑÐ»ÐµÐ½Ð½ÑÐµ Ð·Ð´Ð°Ð½Ð¸Ñ
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description: Ð Ð´Ð°Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÐµ ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½ Ð¿ÑÐ¾ÐµÐºÑ ÑÐµÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸Ð¸ Ð¿ÑÐ¾Ð¼ÑÑÐ»ÐµÐ½Ð½Ð¾Ð³Ð¾ Ð·Ð´Ð°Ð½Ð¸Ñ Ñ Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð¸ÐµÐ¼ ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ð³Ð¾ Ð½Ð°Ð·Ð½Ð°ÑÐµÐ½Ð¸Ñ Ð² Ð¾Ð±ÑÐµÑÑÐ²ÐµÐ½Ð½Ð¾-Ð´ÐµÐ»Ð¾Ð²Ð¾Ð¹ ÑÐµÐ½ÑÑ. ÐÐ°Ð½Ñ Ð¿ÑÐµÐ´Ð»Ð¾Ð¶ÐµÐ½Ð¸Ñ Ð¾ ÑÐµÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸Ð¸ Ð½ÐµÑÐºÑÐ¿Ð»ÑÐ°ÑÐ¸ÑÑÐµÐ¼ÑÑ Ð¿ÑÐ¾Ð¼ÑÑÐ»ÐµÐ½Ð½ÑÑ Ð·Ð´Ð°Ð½Ð¸Ð¹ Ñ Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð¸ÐµÐ¼ Ð¸Ñ ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ð³Ð¾ Ð½Ð°Ð·Ð½Ð°ÑÐµÐ½Ð¸Ñ. ÐÑÐ¾Ð²ÐµÐ´ÐµÐ½Ñ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² ÑÐ°Ð¼ÐºÐ°Ñ ÑÑÑÐµÑÑÐ²ÑÑÑÐµÐ¹ Ð½Ð¾ÑÐ¼Ð°ÑÐ¸Ð²Ð½Ð¾-Ð¿ÑÐ°Ð²Ð¾Ð²Ð¾Ð¹ Ð±Ð°Ð·Ñ, Ð¾Ð¿ÑÐµÐ´ÐµÐ»ÑÑÑÐµÐ¹ ÑÑÐµÐ±Ð¾Ð²Ð°Ð½Ð¸Ñ Ðº ÑÐ½ÐµÑÐ³Ð¾ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÐ¸ Ð²Ð½Ð¾Ð²Ñ Ð²Ð¾Ð·Ð²Ð¾Ð´Ð¸Ð¼ÑÑ Ð¸ ÑÐµÐºÐ¾Ð½ÑÑÑÑÐ¸ÑÑÐµÐ¼ÑÑ Ð·Ð´Ð°Ð½Ð¸Ð¹. Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½ ÐºÐ¾Ð½ÐºÑÐµÑÐ½ÑÐ¹ Ð¿ÑÐ¾ÐµÐºÑ ÑÐµÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸Ð¸ Ð¿ÑÐ¾Ð¼ÑÑÐ»ÐµÐ½Ð½Ð¾Ð³Ð¾ Ð·Ð´Ð°Ð½Ð¸Ñ Ð² Ð¾Ð±ÑÐµÑÑÐ²ÐµÐ½Ð½Ð¾-Ð´ÐµÐ»Ð¾Ð²Ð¾Ð¹ ÑÐµÐ½ÑÑ, ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ñ Ð°ÑÑÐ¸ÑÐµÐºÑÑÑÐ½ÑÐµ Ð¸ ÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸Ð²Ð½ÑÐµ ÑÐµÑÐµÐ½Ð¸Ñ.
description: In this paper, there have been considered a project of a reconstruction of an industrial building into a public-business center. There have been made some recommendations for a reconstructed industrial buildings that are out-of-operation with a change in their functional profile. Conducted The research of the existing regulatory framework that defines the requirements for energy- efficiency of newly constructed and reconstructed buildings has been conducted. There has been developed the architectural and structural concepts for a specific project.
Biomolecular electrostatics using a fast multipole BEM on up to 512 GPUs and a billion unknowns
Creators: name: Yokota, Rio
name: Bardhan, Jaydeep P.
name: Knepley, Matthew G.
name: Barba, L. A.
name: Hamada, Tsuyoshi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We present teraflop-scale calculations of biomolecular electrostatics enabled by the combination of algorithmic and hardware acceleration. The algorithmic acceleration is achieved with the fast multipole method (FMM) in conjunction with a boundary element method (BEM) formulation of the continuum electrostatic model, as well as the BIBEE approximation to BEM. The hardware acceleration is achieved through graphics processors, GPUs. We demonstrate the power of our algorithms and software for the calculation of the electrostatic interactions between biological molecules in solution. The applications demonstrated include the electrostatics of protein--drug binding and several multi-million atom systems consisting of hundreds to thousands of copies of lysozyme molecules. The parallel scalability of the software was studied in a cluster at the Nagasaki Advanced Computing Center, using 128 nodes, each with 4 GPUs. Delicate tuning has resulted in strong scaling with parallel efficiency of 0.8 for 256 and 0.5 for 512 GPUs. The largest application run, with over 20 million atoms and one billion unknowns, required only one minute on 512 GPUs. We are currently adapting our BEM software to solve the linearized Poisson-Boltzmann equation for dilute ionic solutions, and it is also designed to be flexible enough to be extended for a variety of integral equation problems, ranging from Poisson problems to Helmholtz problems in electromagnetics and acoustics to high Reynolds number flow.
Porous carbon derived from high-abundant and low-cost petroleum coke towards high-performance and safe supercapacitors
Creators: name: Gorji Pour Shafiee, Behzad
Publisher: name: University of British Columbia
Year: 2023

description: Hybrid electrolytes are the new type of electrolyte for electrochemical cells that were introduced recently by Suo et al. that have found their way to be used in supercapacitor devices in recent years. However, a critical evaluation of the hybrid electrolyte vs. commonly used organic electrolyte concerning the safety, cost, and electrochemical performance (such as capacitance and cyclic performance) is an important step to fully understanding the hybrid electrolyte’s potential. Here, first, the porosity of the carbon was optimized by changing the activation condition to become compatible with the organic and hybrid electrolytes to evaluate the performance of each electrolyte with different carbons having different porosities. The tuning of porosity of the carbon showed that there is a trade-off between capacitance (and energy density) and rate performance (and power density) as if the activation temperature is raised from 800 to 900 °C, the larger pores cause easier diffusion and better rate performance; however, the cell loses its capacitance as the carbon loses its macropores. Therefore, the carbon needs to be tuned based on the capacity (energy density) requirement or rate performance (power density). If higher energy is required, the carbon should be activated at a lower temperature, and if a better rate performance is needed, the activation should be conducted at a higher temperature. When it comes to the electrolyte, the organic electrolyte is the most commonly used electrolyte in commercial supercapacitors, but they suffer issues such as safety and high cost. Recently, a new type of electrolyte has been introduced to solve the organic electrolyte’s problems. The hybrid electrolyte solved the organic electrolyte’s problems, but these two electrolytes should be evaluated more meticulously and compared to have a clear view. For this purpose, the optimized activated carbons were used with the two electrolytes. The hybrid electrolyte solved the safety and cost issue; furthermore, in spite of operating at a lower potential, the hybrid electrolyte shows better capacitance (52.06 F.g-1 for APC-800-8-hyb vs 41.88 F.g-1 for APC-800-8-org), better power density (25.31 kW kgˉ¹ for APC-900-8-hyb vs 15.42 kW kgˉ¹ for APC-900-8-org), and better rate performance (89.34% for APC-900-8-hyb vs 66.09% for APC-900-8-org); however, the hybrid electrolyte showed lower cyclic performance after 20k cycles (82.91% for APC-900-8-hyb vs 95.33% for APC-900-8-org) and lower energy density (41.39 Wh.kg-1 for APC-800-8-hyb vs 42.15 Wh.kg-1 for APC-800-8-org).
Internal properties and environments of dark matter halos
Creators: name: Wang, Huiyuan
name: Mo, H. J.
name: Jing, Y. P.
name: Yang, Xiaohu
name: Wang, Yu
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We use seven high-resolution $N$-body simulations to study the correlations among different halo properties (assembly time, spin, shape and substructure), and how these halo properties are correlated with the large-scale environment in which halos reside. The large-scale tidal field estimated from halos above a mass threshold is used as our primary quantity to characterize the large-scale environment, while other parameters, such as the local overdensity and the morphology of large-scale structure, are used for comparison. For halos at a fixed mass, all the halo properties depend significantly on environment, particularly the tidal field. The environmental dependence of halo assembly time is primarily driven by local tidal field. The mass of the unbound fraction in substructure is boosted in strong tidal force region, while the bound fraction is suppressed. Halos have a tendency to spin faster in stronger tidal field and the trend is stronger for more massive halos. The spin vectors show significant alignment with the intermediate axis of the tidal field, as expected from the tidal torque theory. Both the major and minor axes of halos are strongly aligned with the corresponding principal axes of the tidal field. In general, a halo that can accrete more material after the formation of its main halo on average is younger, is more elongated, spins faster, and contains a larger amount of substructure. Higher density environments not only provide more material for halo to accrete, but also are places of stronger tidal field that tends to suppress halo accretion. The environmental dependencies are the results of these two competing effects. The tidal field based on halos can be estimated from observation, and we discuss the implications of our results for the environmental dependence of galaxy properties.
description: Accepted for publication in MNRAS
Las lozas de la casa Carbajal-Solís. Punto de encuentro entre el Mediterráneo y el Norte de Europa
Creators: name: Busto Zapico, Miguel
name: Gutiérrez González, José Avelino
name: Estrada García, Rogelio
Publisher: name: Zenodo
Year: 2012
Subjects: Archaeology
pottery
Postmedieval Pottery

description: La cerámica objeto de estudio procede de un conjunto cerrado hallado en las excavaciones arqueológicas del año 2009 en la casa Carbajal Solís, sita en el nº 10 de la Calle de la Rúa de la ciudad de Oviedo. Su cronología abarcaría los últimos momentos del medievo y los inicios de la modernidad.

 Aplicando una metodología exhaustiva con vistas a su extrapolación a otros lotes cerámicos de la misma zona y cronología, lo que se ha pretendido es, no solo crear una serie de tipologías orientadas a proporcionar tablas de formas o de cronologías cerámicas, sino que se ha tratado de rastrear la importancia histórica de las mismas.

 Ello permite aclarar una serie de cuestiones relacionadas con la procedencia de las piezas. Al mismo tiempo, obtener una información amplia sobre las producciones cerámicas peninsulares y europeas, entre la Baja Edad Media y la primera Edad Moderna. Este lote, queda así configurado, como un punto de encuentro entre diferentes realidades como son la puramente ibérica, la Mediterránea y la del norte de Europea. Y es que, en este conjunto cerámico nos encontramos junto a la cerámica de carácter puramente local, una gran cantidad de lozas importadas de enclaves como Talavera de la Reina, Cataluña, Valencia, Portugal, Italia, Holanda, Inglaterra…

 Así mismo, queda reflejada la existencia de una aristocracia con una vida elevada y rica, sensible a los gustos y la moda de su tiempo, con los suficientes recursos para demandar estos productos de lujo. Junto con la cerámica llegarán otras influencias culturales y sociales determinantes para entender el final del medievo y los inicios de la modernidad asturiana. Este estudio convierte a Oviedo, enclave en apariencia alejado, en un centro receptor y muy probablemente difusor de cerámica, inmerso plenamente en una serie de rutas comerciales y conector a pequeña escala del Mediterráneo y el Atlántico.
Biomimetic orthopaedic implants: harnessing bone’s remodelling response with additive manufacturing
Creators: name: Munford, Maxwell James
Publisher: name: Imperial College London
Year: 2022

description: The long-term healing of bone is inherently coupled with the strain it experiences, as described by numerous laws governing bone’s mechanobiology and natural remodelling process. Bone regeneration can therefore be accelerated by the use of porous structures in orthopaedics which have a mechanical modulus akin to the bone being replaced. Following design and regulatory requirements, a further consideration is that yield strength and fatigue strength must be suitable for the implants applications. Conventional orthopaedic implants are solid metal so therefore have excessive strength and stiffness. This means that they cause regions of bone to be underloaded, leading to bone resorption which complicates surgery. This PhD explored optimising additively manufactured (AM) porous structures for application as bone growth stimulating orthopaedic implants. The mechanical modulus, strength and anisotropy of bone and AM structures was characterised in a workflow which uses manufacturing and imaging methods commonly used in industry. Following this, individual AM structures were designed and manufactured based on computed tomography (CT) scans of bone to control the strain experienced. Orthopaedic implants were then manufactured which replicated the loading and strain environment experienced in healthy bone. Mechanical mappings of bone and AM structures were shown to predict properties to within 5.6% and 2%, while custom AM implants could control bone strain from -15% to +15% of homeostasis (corresponding to an extension of -4500 µm to 4500 µm). Conventional solid counter parts underloaded up to 70% of peri-prosphethic bone, whereas AM implants closely replicated the loaded experienced by bone prior to implantation (achieving mechanical environments which were 68-78% similar). This thesis has emphasis on understanding bone’s mechanical properties and the effect of implants on mechanical stimulus, which will allow for more accurate testing of the mechanical behaviour of bone in response to implanted porous scaffolds and for better translation from in vivo studies to commercial implants.
The Yale (new approach, moderation, liquor-subsidized) School of Alcohol Studies under fire at the Annual Meeting of The national Temperance and Prohibition Council
Creators: name: Alcohol Research Documentation, Inc.
Publisher: name: No Publisher Supplied
Year: 1950

description: Clippings from The Yale (new approach, moderation, liquor-subsidized) School of Alcohol Studies under fire at the Annual Meeting of The national Temperance and Prohibition Council, held in Washington, DC, January 9-11, 1950. Criticism written by Ernest S. Gordon, Mrs. Leigh Colvin, President of the National Woman's Cristian Temperance Union, and Bishop Wilbur E. Hammaker, Executive Vice-President of the Board of Temperance of the Methodist Church and President of the National Temperance Council.
Theory and simulation of the confined Lebwohl-Lasher model
Creators: name: Marguta, R. G.
name: Almarza, N. G.
name: Martinez-Raton, Y.
name: Velasco, E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss the Lebwohl-Lasher model of nematic liquid crystals in a confined geometry, using Monte Carlo simulation and mean-field theory. A film of material is sandwiched between two planar, parallel plates that couple to the adjacent spins via a surface strength $ε_s$. We consider the cases where the favoured alignments at the two walls are the same (symmetric cell) or different (asymmetric or hybrid cell). In the latter case, we demonstrate the existence of a {\it single} phase transition in the slab for all values of the cell thickness. This transition has been observed before in the regime of narrow cells, where the two structures involved correspond to different arrangements of the nematic director. By studying wider cells, we show that the transition is in fact the usual isotropic-to-nematic (capillary) transition under confinement in the case of antagonistic surface forces. We show results for a wide range of values of film thickness, and discuss the phenomenology using a mean-field model.
description: 40 pages 19 figures (preprint format). Part of the text and some figures were modified. New figure was included
Neutrino Masses, Dark Matter and B-L Symmetry at the LHC
Creators: name: Li, Tong
name: Chao, Wei
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We establish a hybrid seesaw mechanism to explain small neutrino masses and predict cold dark matter candidate in the context of the B-L gauge symmetry extension of the Standard Model. In this model a new scalar doublet and two new fermion singlets are introduced at loop-level beyond the minimal Type I seesaw. The lightest particle inside the loop can be dark matter candidate. We study in detail the constraints from neutrino oscillation data, lepton flavor violating processes and cosmological observation. We also explore the predictions of the decays of the new charged scalars in each spectrum of neutrino masses and show the most optimistic scenarios to distinguish the spectra. We consider the pair production of the stable fermion associated with two observable SM charged leptons at the LHC, which occurs in a two-step cascade decay of the new gauge boson Z' and the new charged scalars stand as intermediate particles. The masses of missing dark matter and its parent particle can be well-determined in such production topology.
description: 20 pages, 9 figures and 2 tables, revised version accepted for publication in Nucl. Phys. B
Pair production in laser fields: finite size effects
Creators: name: Heinzl, Thomas
name: Ilderton, Anton
name: Marklund, Mattias
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss pair creation in a strong laser background. Using lightfront field theory, we show that all the physics is contained in the lightfront momentum transfer from the laser, and probe, to the produced pair. The dependence of this momentum transfer on the geometry of the laser leads to resonance and diffraction effects in pair production spectra. The lightfront approach naturally explains the interpretation of laser-stimulated pair production as a multi-photon process creating pairs of an effective mass.
description: Talk presented by A.I. at Light Cone 2010: Relativistic Hadronic and Particle Physics, 14-18 June 2010, Valencia, Spain
The chromatographic characterisation of porous materials for heterogeneous process efficiency
Creators: name: McIntyre, Sean Ryan
Publisher: name: Imperial College London
Year: 2022

description: Porous materials are used in a variety of industrial processes, from the heterogeneous separation of chemical products to waste-water remediation, and catalysis. Often macro-scale mass transfer events are characterised by the microscale diffusion phenomena both in and out of the pores of a material. In this work, the Zero-Length Column (ZLC) method is used to determine liquid phase diffusion constants, mass transfer coefficients, and adsorption equilibrium isotherms. Limitations for applying the ZLC method to the liquid phase phenomena on a HPLC instrument were reviewed, with a particular focus on materials/adsorbents within which the adsorbate produces large interactions, with both macropore and micropore diffusion constants calculated at 2.7 x 10-7 and 5.8 x 10-8 cm2 s-1 respectively. Where appropriate, experimental procedures were proposed to decouple the surface and kinetic diffusion. The current liquid phase ZLC model has been adapted for cylindrical pellets, such as extrudates, which are commonly used in industrial applications such as isomer separations. This novel model incorporates a complete consideration of the fluid phase hold-up effects, which is necessary for liquid phase measurements. Effective diffusion constants calculated at ~1 x 10-6 cm2 s-1 compared acceptably to those molecular pore diffusion constants obtained from Pulsed-Field Gradient (PFG) NMR ~5 x 10-6 cm2 s-1. The biomass conversion of levulinic acid to γ-valerolactone by transfer hydrogenation was used as a case study for the reaction and ZLC characterisation. The post-synthetic modification of MIL-100 with decyl-phosphonic acid increased the material stability by 60% and increased the LA conversion by 20%, owing to an increase in MOF hydrophobicity. Treatment with octadecyl-phosphonic acid caused significant pore blockages, reflected by the ZLC macropore diffusion at 1.4 x 10 -7 cm2 s-1, resulting in a decrease in conversion by approximately 20%.
Gait intent recognition using mechanomyography for application in prosthetic lower limb control
Creators: name: Needham, Ashwin Paul Henry
Publisher: name: Imperial College London
Year: 2022

description: It has always been supposed that a prosthesis must infer its function itself and in doing so replace the brain of the user. With the emergence of the bionic not only does one have the function the user requires, but potential for the control they crave. By fusing man and machine how does one accomplish the non-trivial task of interfacing the brain and conscious will of the subject with the bionic? It has long been recognised that the subconscious neural pathways that would have previously controlled the lower limb in walking are not severed when the limb is. Mapping the residual muscle activity to these walking modes is a question of science, and not imagination. In this study I use microphonic mechanomyographic muscle activity sensors to achieve this long sought-after goal using pattern recognition as applied through an SVM machine learning algorithm. In doing so one must counter the problem of data volume, as seen through the eyes of an amputee, with sympathy to their stamina and comfort. I contemplate the challenge through 3 distinct clinical scenarios. Firstly, one provides an off the shelf, preprogramed device with an algorithm trained on a cohort of able-bodied subjects to create a subject-independent data pool. Secondly, a clinician acclimatises the amputee to the algorithm through a limited training routine. Thirdly, we train the knee device using the amputee. In exploring these I transition through various levels of significance until an average of 90.1% accuracy in identifying gait modes is achieved, with 89.3% from the amputee differentiating groups of 2 of 5 walking modes from each other, including level walking at various cadences and ramp ascent and descent. In further work, a bespoke diagnostic socket is designed, manufactured and tested for my amputee subject, a significant advance on the status quo in the industry.
Two-photon scattering by a driven three-level emitter in a one-dimensional waveguide and electromagnetically induced transparency
Creators: name: Roy, Dibyendu
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We study correlated two-photon transport in a (quasi) one-dimensional photonic waveguide coupled to a three-level $Λ$-type emitter driven by a classical light field. Two-photon correlation is much stronger in the waveguide for a driven three-level emitter (3LE) than a two-level emitter. The driven 3LE waveguide shows electromagnetically induced transparency (EIT), and we investigate the scaling of EIT for one and two photons. We show that the two transmitted photons are bunched together at any distance separation when energy of the incident photons meets "two-photon resonance" criterion for EIT.
description: 5 pages, 3 figures
title: ÐÐ¿ÑÐµÐ´ÐµÐ»ÐµÐ½Ð¸Ðµ ÐºÑÐ¸Ð²Ð¸Ð·Ð½Ñ ÐºÑÐ¸ÑÑÐ°Ð»Ð»Ð° Ð¿Ð¾ Ð´Ð¸ÑÐºÑÐµÑÐ½ÑÐ¼ Ð¾ÑÐ¸ÐµÐ½ÑÐ¸ÑÐ¾Ð²ÐºÐ°Ð¼ Ð´Ð»Ñ Ð¾ÑÐ¾Ð±ÑÐ°Ð¶ÐµÐ½Ð¸Ñ ÑÑÐ±ÑÑÑÑÐºÑÑÑÑ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Determination the curvature of a crystal using discrete orientations to display the substructure
Creators: name: ÐÑÑÑÐµÐ², ÐÐ»ÐµÐºÑÐµÐ¹
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2019
Subjects: ÐºÑÐ¸Ð²Ð¸Ð·Ð½Ñ ÐºÑÐ¸ÑÑÐ°Ð»Ð»Ð°
Ð´Ð¸ÑÐºÑÐµÑÐ½ÑÐµ Ð¾ÑÐ¸ÐµÐ½ÑÐ¸ÑÐ¾Ð²ÐºÐ¸
ÑÑÐ±ÑÑÑÑÐºÑÑÑÐ°
Ð¼Ð°Ð»Ð¾ÑÐ³Ð»Ð¾Ð²ÑÐµ Ð³ÑÐ°Ð½Ð¸ÑÑ
Ð¾ÑÐ¸ÐµÐ½ÑÐ°ÑÐ¸Ð¾Ð½Ð½ÑÐµ ÐºÐ°ÑÑÑ
Ð´Ð¸ÑÑÐ°ÐºÑÐ¸Ñ Ð¾Ð±ÑÐ°ÑÐ½Ð¾ ÑÐ°ÑÑÐµÑÐ½Ð½ÑÑ ÑÐ»ÐµÐºÑÑÐ¾Ð½Ð¾Ð²
crystal curvature
discrete orientations
substructure
low-angle boundaries
orientation data
EBSD

description: ÐÑÐ¿ÑÑÐºÐ½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° Ð¾Ð±ÑÐ°Ð±Ð¾ÑÐºÐµ Ð´Ð°Ð½Ð½ÑÑ, Ð¿Ð¾Ð»ÑÑÐµÐ½Ð½ÑÑ Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ EBSD Ð°Ð½Ð°Ð»Ð¸Ð·Ð°. Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½ Ð¸ ÑÐµÐ°Ð»Ð¸Ð·Ð¾Ð²Ð°Ð½ Ð¼ÐµÑÐ¾Ð´, Ð¾Ð¿ÑÐµÐ´ÐµÐ»ÑÑÑÐ¸Ð¹ ÐºÑÐ¸Ð²Ð¸Ð·Ð½Ñ ÐºÑÐ¸ÑÑÐ°Ð»Ð»Ð° Ð¿Ð¾ ÐµÐ³Ð¾ Ð´Ð¸ÑÐºÑÐµÑÐ½ÑÐ¼ Ð¾ÑÐ¸ÐµÐ½ÑÐ¸ÑÐ¾Ð²ÐºÐ°Ð¼. Ð­ÑÐ¾ Ð¿Ð¾Ð·Ð²Ð¾Ð»ÑÐµÑ Ð¿ÑÐ¾Ð²Ð¾Ð´Ð¸ÑÑ Ð±Ð¾Ð»ÐµÐµ Ð´ÐµÑÐ°Ð»ÑÐ½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð· ÑÑÐ±ÑÑÑÑÐºÑÑÑÑ Ð¿Ð¾ ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ñ Ñ ÑÑÐ°Ð´Ð¸ÑÐ¸Ð¾Ð½Ð½ÑÐ¼ Ð¼ÐµÑÐ¾Ð´Ð¾Ð¼ EBSD, Ð² ÑÐ°ÑÑÐ½Ð¾ÑÑÐ¸ - Ð¾ÑÐ¾Ð±ÑÐ°Ð¶Ð°ÑÑ Ð¼Ð°Ð»Ð¾ÑÐ³Ð»Ð¾Ð²ÑÐµ Ð³ÑÐ°Ð½Ð¸ÑÑ.
description: Graduation work is devoted to the processing of data obtained using EBSD analysis. A method has been developed and implemented that determines the curvature of a crystal according to its discrete orientations. This allows a more detailed analysis of the substructure compared with the traditional EBSD method, in particular, it allows to display low-angle boundaries.
Back to basics : the sustainable responses to COVID-19 pandemic
Creators: name: Parker, Ariele
Publisher: name: University of British Columbia
Year: 2023

description: The sustainable product market has experienced steady growth in the past decade in North America. It is estimated that this market could hit USD150 billion in the United States by the end of 2021 (Gelski, 2019). In Canada, 74% of consumers consider sustainability an important factor when making purchases (Ranken, 2019). The COVID-19 pandemic initiates a new round of dialogue of sustainable consumption and community resilience. The changing work-life pattern and the disrupted local and global supply chain forced both market agents and consumers to establish new strategies and practices to sustain and survive during the global pandemic. In this thesis, I seek to answer the primary research question: How do marketers and consumers develop resilience through sustainable marketing and consumption during the COVID-19 pandemic? This research has been conducted in partnership with a local lifestyle brand based in the Okanagan region of British Columbia. The objectives of this research study include: (i) to identify market needs for sustainable goods in the Okanagan; (ii) to investigate the consumption of sustainable goods in the Okanagan; (iii) to examine the process of sourcing sustainable goods during the pandemic, and (iv) to examine the development of community and organizational resilience during the pandemic. Through a study consisting of interviews and participatory action research, I examine the new roles of marketers and consumers through the conceptualization of sustainability, pro-environmental and pro-social production and consumption that reflect the United Nations’ Sustainable Development Goal 12 (Responsible consumption and production). Our findings show that pro-social and pro-environmental consumers actively considered themselves as the “ambassadors” of sustainable and local products during the pandemic. Many local businesses also created innovative strategies to engage local and regional partners to pursue the sustainable goals during the pandemic. Building on the recent literature on pro-environmental and pro-social movements, my present research introduces the conceptions of organizational sustainability and community sustainability. These concepts reflect both interactions between market agents, consumers and other community and market stakeholders on new product designs from recycling, upcycling, green consumption to zero waste, and sustainable lifestyles.