cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Uncertainty quantification Of performance and stability of high-speed axial compressors
Creators: name: Suriyanarayanan, Venkatesh
Publisher: name: Imperial College London
Year: 2020

description: Geometrical uncertainties in a compressor (due to manufacturing tolerance and/or in-service degradation) often result in flow asymmetry around the annulus of a compressor that jeopardises compressor stability and performance. Usually, sensitivity of compressor stability and performance for any parametric variation is arrived at by considering all blades to have same dimension. In reality, an inherent blade-to-blade variation causes the blades to have a probability distribution. These blades can be redistributed circumferentially resulting in adjacent passage areas between different blades to be completely random and hence the performance variation. Surrogate model is preferred for quantifying the effects of parametric variation on compressor stability and performance given its quick turnaround time vis-a-vis CFD and experiments. In this thesis, uncertainties for three test cases were considered: each representative of fans on military aircraft engines, fans on civil aircraft engines and a 1-stage transonic compressor used in industrial gas turbine. This research establishes a rule of thumb to arrange blades of differing dimensions around the compressor to eke out maximum performance and stability margin. The parameters tip gap and stagger angle represent manufacturing tolerance while in-service degradation was represented by leading edge damage. For both random tip gap variation (0.15% to 0.94% span) and random leading edge damage (4% to 18% chord), the compressor performance and stability boundaries were found to be best with a zigzag pattern of blade arrangement and worst with a sinusoidal pattern of arrangement. The converse was found to be true for blades having random stagger angle variation (± 2.25% change in nominal stagger angle). The best/worst arrangement of blades with differing dimensions was ascertained using a mix of CFD and travelling salesman (TSP) analogy. The TSP analogy is handy for determining the best arrangement when two or more parameters vary simultaneously. Generalised surrogate model was developed to accurately predict the performance of compressors undergoing random tip gap and stagger angle variation. Due to its robustness, the surrogate model was combined with Monte Carlo technique to gauge the impact of parametric variation on quantities of interest (QoI). The mean absolute percentage error between CFD and surrogate models of stagger angle and tip gap (for different QoI) were found to be less than 0.14% and 1.5% respectively. This de novo analysis considers only the aerodynamic effect from geometric variations while neglecting the associated aeroelastic effects. Detailed analyses based on past experience and physical reasoning were used to validate the numerical simulations.
Ultrasound-driven microbubble dynamics in microvessels
Creators: name: Bezer, James Henry
Publisher: name: Imperial College London
Year: 2021

description: Ultrasound and microbubble induced blood-brain barrier opening has shown success in clinical trials as a promising method to deliver drugs to the brain. Shelled gas bubbles, a few micrometres in diameter, are administered intravenously, and distribute throughout the cardiovascular system. When ultrasound is applied to the brain, the microbubbles expand and contract within the vasculature, temporarily disrupting the blood-brain barrier, and allowing drugs to pass through. While this technique has been shown to be effective at delivering drugs, its mechanisms remain relatively poorly understood. Better understanding how microbubbles interact with tissues could enable refinement of therapies. This thesis investigates the fundamental physical interactions between microbubbles and soft tissues using two distinct but related experimental platforms that utilise high-speed microscopy. Firstly, microbubbles within soft tissue-mimicking hydrogel channels are observed during exposure to typical therapeutic ultrasound pulses. The primary radiation force is shown to be significant, and can cause bubbles to deform the soft gels by several micrometres. Microbubbles are also investigated in brain tissue, using acute cortical slices from the brains of juvenile rats, transcardially perfused post-mortem with a concentrated solution of SonoVue®. This technique is shown to be an effective method of observing microbubbles using optical microscopy within the microvasculature of live brain tissue. Radial oscillations of bubbles within brain microvessels can deform surrounding tissue at both microsecond and millisecond time scales. Extravasation of microbubbles due to the primary radiation force can occur during typical ultrasound pulses, and is common at higher ultrasound pressures (mechanical index of 0.6 and above). These results demonstrate the significance of both radial oscillations and the primary radiation force as ways in which microbubbles can physically impact their surroundings. Additionally, acute brain slices are shown to be a valuable tool to investigate microbubble behaviours and mechanisms of drug delivery in a physiologically relevant environment.
Combined mechanistic and machine learning method for construction of oil reservoir permeability map consistent with well test measurements
Creators: name: Kanin, E. A.
name: Garipova, A. A.
name: Boronin, S. A.
name: Vanovsky, V. V.
name: Vainshtein, A. L.
name: Afanasyev, A. A.
name: Osiptsov, A. A.
name: Burnaev, E. V.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Geophysics (physics.geo-ph)
subject: Machine Learning (cs.LG)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We propose a new method for construction of the absolute permeability map consistent with the interpreted results of well logging and well test measurements in oil reservoirs. Nadaraya-Watson kernel regression is used to approximate two-dimensional spatial distribution of the rock permeability. Parameters of the kernel regression are tuned by solving the optimization problem in which, for each well placed in an oil reservoir, we minimize the difference between the actual and predicted values of (i) absolute permeability at the well location (from well logging); (ii) absolute integral permeability of the domain around the well and (iii) skin factor (from well tests). Inverse problem is solved via multiple solutions to forward problems, in which we estimate the integral permeability of reservoir surrounding a well and the skin factor by the surrogate model. The last one is developed using an artificial neural network trained on the physics-based synthetic dataset generated using the procedure comprising the numerical simulation of bottomhole pressure decline curve in reservoir simulator followed by its interpretation using a semi-analytical reservoir model. The developed method for reservoir permeability map construction is applied to the available reservoir model (Egg Model) with highly heterogeneous permeability distribution due to the presence of highly-permeable channels. We showed that the constructed permeability map is hydrodynamically similar to the original one. Numerical simulations of production in the reservoir with constructed and original permeability maps are quantitatively similar in terms of the pore pressure and fluid saturations distribution at the end of the simulation period. Moreover, we obtained an good match between the obtained results of numerical simulations in terms of the flow rates and total volumes of produced oil, water and injected water.
Black New Ark v.2 no.5
Creators: name: No Name Supplied
Publisher: name: No Publisher Supplied
Year: 1973

description: The publication month for this issue appears in Swahili. This issue of Black New Ark volume 2, number 5, has a publication date of May 1973. Contributions of news articles, essays, illustrations, photographs, or advertisements are attributed to Cheo Hekima, Bibi Amina Baraka, and Imamu Amiri Baraka.
Roles in Software Development using Domain Specific Modeling Languages
Creators: name: Krahn, Holger
name: Rumpe, Bernhard
name: Völkel, Steven
Publisher: name: arXiv
Year: 2014
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Domain-specific modelling languages (DSMLs) successfully separate the conceptual and technical design of a software system by modelling requirements in the DSML and adding technical elements by appropriate generator technology. In this paper we describe the roles within an agile development process that allows us to implement a software system by using a combination of domain specific models and source code. We describe the setup of such a process using the MontiCore framework and demonstrate the advantages by describing how a group of developers with diverse individual skills can develop automotive HMI software.
description: 9 pages, 3 figures
Abundance trends in floodplain fish larvae: the role of annual flow characteristics in the absence of overbank flooding
Creators: name: Vilizzi, Lorenzo
Publisher: name: La Trobe
Year: 2023

description:

MDFRC item.

Temporal variability in flow is central to the functioning of river ecosystems, with current conceptual models emphasising the importance of flow events, namely overbank flood pulses and in-channel flow pulses, in enhancing riverine fish production. However, whilst the benefits of flood pulses have been widely documented, there is an overall dearth of information with regard to the role of flow pulses in enhancing fish spawning and recruitment. To test the validity of applicable conceptual models of floodplain fish production in response to alternating low-flow and flow-pulse years in the absence of a flood pulse, fish larvae were sampled every three to five weeks from 2002 to 2007 in an anabranch system of the highly-regulated and semi-arid lower Murray River (southeastern Australia). Small-bodied native fish (mainly, un-specked hardyhead, carp gudgeon, flathead gudgeon and Australian smelt) spawned successfully in every year irrespective of hydrological conditions, with Australian smelt being particularly abundant in two of the three low-flow years following a flow-pulse event. However, spawning in the majority of these small-bodied species was enhanced by the two flow pulses. On the contrary, large-bodied silver perch and golden perch only spawned during one of the two spring flow pulses, emphasising the importance of both timing and duration of a flow pulse along with its coupling with temperature. The findings of the present study support recent views that a combination of conceptual models of floodplain fish production is likely to apply in temperate to semi-arid floodplain rivers. Management measures aimed at the benefit of native fish communities should account for both flow and flood pulses through the release of environmental water, and this should be supported by long-term studies able to span the components of a river's flow history.
New ${\cal N} = 1$ supersymmetric $AdS_5$ backgrounds in Type IIA supergravity
Creators: name: Sfetsos, Konstadinos
name: Thompson, Daniel C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a family of N=1 supersymmetric backgrounds in type-IIA supergravity and their lifts to eleven-dimensional supergravity. These are of the form $AdS_5 \times X^5$ and are characterised by an $SU(2)$ structure. The internal space, $X^5$, is obtained from the known Sasaki-Einstein manifolds, $Y^{p,q}$, via an application of non-Abelian T-duality.
description: 15 pages
Analysis of anisotropic subgrid-scale stress for coarse large-eddy simulation
Creators: name: Inagaki, Kazuhiro
name: Kobayashi, Hiromichi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: This study discusses the necessity of anisotropic subgrid-scale (SGS) stress in large-eddy simulations (LESs) of turbulent shear flows using a coarse grid resolution. We decompose the SGS stress into two parts to observe the role of SGS stress in turbulent shear flows in addition to the energy transfer between grid-scale (GS or resolved scale) and SGS. One is the isotropic eddy-viscosity term, which contributes to energy transfer, and the other is the residual anisotropic term, which is separated from the energy transfer. We investigate the budget equation for GS Reynolds stress in turbulent channel flows accompanied by the SGS stress decomposition. In addition, we examine the medium and coarse filter length cases; the conventional eddy-viscosity models can fairly predict the mean velocity profile for the medium filter case and fails for the coarse filter case. The budget for GS turbulent kinetic energy shows that the anisotropic SGS stress has a negligible contribution to energy transfer. In contrast, the anisotropic stress has a large and non-dissipative contribution to the streamwise and spanwise components of GS Reynolds stress when the filter size is large. Even for the medium-size filter case, the anisotropic stress contributes positively to the budget for the spanwise GS Reynolds stress. Spectral analysis of the budget reveals that the positive contribution is prominent at a scale consistent with the spacing of streaks in the near-wall region. Therefore, we infer that anisotropic stress contributes to the generation mechanism of coherent structures. Predicting the positive contribution of the anisotropic stress to the budget is key to further improving SGS models.
description: 40 pages, 17 figures
Upper semi-continuity of the Hilbert-Kunz multiplicity
Creators: name: Smirnov, Ilya
Publisher: name: arXiv
Year: 2014
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 13D40, 13A35, 13F40

description: We prove that the Hilbert-Kunz multiplicity is upper semi-continuous in F-finite rings and algebras of essentially finite type over an excellent local ring.
Single cell analysis for applications in drug-target engagement and the study of clinically relevant samples
Creators: name: Osman, Suhuur
Publisher: name: Imperial College London
Year: 2021

description: Single cell analysis provides the ability to profile the heterogeneity in protein expression that exists within a population of cells, thereby providing a key insight into cellular function, disease progression and drug resistance. However, the field of single-cell proteomics is burdened with technical challenges, including the protein domain size, meaning many of these techniques do not have the sensitivity required to quantify proteins of low concentration in individual cells. The use of microfluidics devices for single cell proteomics presents numerous benefits, including the ability to quantify low protein counts from single cells, as well as low sample consumption. The microfluidic affinity capture (MAC) chip is a microfluidic device capable of quantifying protein copy numbers from single cells. In this thesis, we detail the design, fabrication and experimental format of the MAC chip. Chapter 3 details the process of optimising and validating the FOXO1 assay in order to reproducibly quantify the active FOXO1 levels of single cells from a range of different cell lines. The assay was validated by modulating the active FOXO1 levels using a small molecule PI3K inhibitor. This resulted in an increase in the measured active FOXO1 as expected. The specificity of the detection antibody was confirmed using western blot as an orthogonal technique. Further validation of the FOXO1 MAC chip assay was conducted using FOXO1 siRNA knockdown, which resulted in an expected reduction in the active FOXO1 signal. Chapter 4 focuses on the application of the FOXO1 assay in measuring FOXO1 target engagement. This was conducted using the well-established cellular thermal shift assay (CETSA), using a TIRF-based readout to achieve single-cell resolution. 3 different FOXO1 inhibitors were utilised, which successfully displayed differing levels of target engagement. Validation of the single-cell CETSA method was conducted using the traditional western-blot CETSA technique. Chapter 5 details the move from working with standard cell lines to studying clinically relevant patient samples in the context of COPD. Importantly, this chapter focuses on developing workflows that enable the successful use of small quantities of patient samples, an important consideration owing to the precious nature of these cells. A workflow was created in order to successfully collect small volumes of samples from a frozen core of bronchial epithelial cells. The latter portion of the chapter explores the move towards using less invasive sampling methods, with nasal sampling being identified as strong candidate for being able to probe the cellular senescence and inflammation associated with COPD. Protocol development was conducted using nasal samples collected from healthy volunteers, with the successful evaluation of FOXO1 from both T-cells and epithelial cells.
Stationary Kernels and Gaussian Processes on Lie Groups and their Homogeneous Spaces II: non-compact symmetric spaces
Creators: name: Azangulov, Iskander
name: Smolensky, Andrei
name: Terenin, Alexander
name: Borovitskiy, Viacheslav
Publisher: name: arXiv
Year: 2023
Subjects: subject: Methodology (stat.ME)
subject: Machine Learning (cs.LG)
subject: Statistics Theory (math.ST)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Gaussian processes are arguably the most important class of spatiotemporal models within machine learning. They encode prior information about the modeled function and can be used for exact or approximate Bayesian learning. In many applications, particularly in physical sciences and engineering, but also in areas such as geostatistics and neuroscience, invariance to symmetries is one of the most fundamental forms of prior information one can consider. The invariance of a Gaussian process' covariance to such symmetries gives rise to the most natural generalization of the concept of stationarity to such spaces. In this work, we develop constructive and practical techniques for building stationary Gaussian processes on a very large class of non-Euclidean spaces arising in the context of symmetries. Our techniques make it possible to (i) calculate covariance kernels and (ii) sample from prior and posterior Gaussian processes defined on such spaces, both in a practical manner. This work is split into two parts, each involving different technical considerations: part I studies compact spaces, while part II studies non-compact spaces possessing certain structure. Our contributions make the non-Euclidean Gaussian process models we study compatible with well-understood computational techniques available in standard Gaussian process software packages, thereby making them accessible to practitioners.
Response from F. Lawerence Oaks to Douglas Biggerstaff, Project Review for Proposed Demolition of Buildings 238 and 240, Fort Sam Houston, Texas
Creators: name: F. Lawrence Oaks
Publisher: name: Texas Historical Commission
Year: 2003
Subjects: subject: JBSA-Sam Houston
valueUri: https://core.tdar.org/browse/geographic-keyword/82532/jbsa-sam-houston
subject: San Antonio
valueUri: https://core.tdar.org/browse/geographic-keyword/4149/san-antonio
subject: Bexar (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/4150/bexar-county
subject: Texas
valueUri: https://core.tdar.org/browse/geographic-keyword/6923/texas
subject: Fort Sam Houston National Historic Landmark District
valueUri: https://core.tdar.org/browse/geographic-keyword/82955/fort-sam-houston-national-historic-landmark-district
subject: Historic
valueUri: https://core.tdar.org/browse/culture-keyword/25/historic
subject: Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/318/governmental-structure
subject: Historic Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/320/historic-governmental-structure
subject: Building 238
valueUri: https://core.tdar.org/browse/other-keyword/146344/building-238
subject: Building 240
valueUri: https://core.tdar.org/browse/other-keyword/146346/building-240
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: The Texas Historical Commission has received correspondence from Fort Sam Houston describing the proposed demolition of Buildings 238 and 240. This letter serves as comment on the proposed undertaking and its associating MOA from the State Historic Preservation Officer, the Executive Director of the Texas Historical Commission. Copied to this correspondence is Anne McGlone (City of San Antonio Preservation Office), Joan Gaither (Society for the Preservation of Historic Fort Sam Houston), Jill Harrison Souter (San Antonio Conservation Society) and Virginia S. Nicholas (Bexar County Historical Commission).
UML 2 Semantics Symposium: Formal Semantics for UML
Creators: name: Broy, Manfred
name: Crane, Michelle L.
name: Dingel, Juergen
name: Hartman, Alan
name: Rumpe, Bernhar
name: Selic, Brau
Publisher: name: arXiv
Year: 2014
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: The purpose of this symposium, held in conjunction with MoDELS 2006, was to present the current state of research of the UML 2 Semantics Project. Equally important to receiving feedback from an audience of experts was the opportunity to invite researchers in the field to discuss their own work related to a formal semantics for the Unified Modeling Language. This symposium is a follow-on to our first workshop, held in conjunction with ECMDA 2005.
description: 6 pages, 1 figures
Supertraces on queerified algebras
Creators: name: Leites, Dimitry
name: Shchepochkina, Irina
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: Primary 17B20, 16W55 Secondary 81Q60, 17B70

description: We describe supertraces on ``queerifications'' (see arxiv:2203.06917) of the algebras of matrices of ``complex size'', algebras of observables of Calogero-Moser model, Vasiliev higher spin algebras, and (super)algebras of pseudo-differential operators. In the latter case, the supertraces establish complete integrability of the analogs of Euler equations to be written.
description: 8 pages
Reduction of systemic risk by means of Pigouvian taxation
Creators: name: Zlatić, Vinko
name: Gabbi, Giampaolo
name: Abraham, Hrvoje
Publisher: name: arXiv
Year: 2014
Subjects: subject: Risk Management (q-fin.RM)
subject: Physics and Society (physics.soc-ph)
subject: General Finance (q-fin.GN)
subject: Trading and Market Microstructure (q-fin.TR)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: We analyze the possibility of reduction of systemic risk in financial markets through Pigouvian taxation of financial institutions which is used to support the rescue fund. We introduce the concept of the cascade risk with a clear operational definition as a subclass and a network related measure of the systemic risk. Using financial networks constructed from real Italian money market data and using realistic parameters, we show that the cascade risk can be substantially reduced by a small rate of taxation and by means of a simple strategy of the money transfer from the rescue fund to interbanking market subjects. Furthermore, we show that while negative effects on the return on investment ($ROI$) are direct and certain, an overall positive effect on risk adjusted return on investments ($ROI^{RA}$) is visible. Please note that \emph{the taxation} is introduced as a monetary/regulatory, not as a fiscal measure, as the term could suggest. \emph{The rescue fund} is implemented in a form of a common reserve fund.
description: 19 pages, 9 figures
Reduced resonance schemes and Chen ranks
Creators: name: Aprodu, Marian
name: Farkas, Gavril
name: Raicu, Claudiu
name: Suciu, Alexander I.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Algebraic Geometry (math.AG)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: The resonance varieties are cohomological invariants that are studied in a variety of topological, combinatorial, and geometric contexts. We discuss their scheme structure in a general algebraic setting and introduce various properties that ensure the reducedness of the associated projective resonance scheme. We prove an asymptotic formula for the Hilbert series of the associated Koszul module, then discuss applications to vector bundles on algebraic curves and to Chen ranks formulas for finitely generated groups, with special emphasis on Kähler and right-angled Artin groups.
description: 36 pages. Final version, to appear in the Journal fuer die reine und angewandte Mathematik (Crelle)
Note, Enclosing Arches Building 663, Randolph Air Force Base, TX
Creators: name: Shepherd, Scott B.
Year: 1992
Subjects: subject: San Antonio
valueUri: https://core.tdar.org/browse/geographic-keyword/4149/san-antonio
subject: Texas
valueUri: https://core.tdar.org/browse/geographic-keyword/6923/texas
subject: Randolph Air Force Base
valueUri: https://core.tdar.org/browse/geographic-keyword/78971/randolph-air-force-base
subject: Historic
valueUri: https://core.tdar.org/browse/culture-keyword/25/historic
subject: Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/318/governmental-structure
subject: Historic Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/320/historic-governmental-structure
subject: Building 663
valueUri: https://core.tdar.org/browse/other-keyword/146444/building-663
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: Handwritten note detailing verbal agreement that the remaining arches at Building 663 should be enclosed. Building 663 is located at Randolph Air Force Base, Texas.
Privacy and security in cyber-physical systems
Creators: name: Erdemir, Ecenaz
Publisher: name: Imperial College London
Year: 2021

description: Data privacy has attracted increasing attention in the past decade due to the emerging technologies that require our data to provide utility. Service providers (SPs) encourage users to share their personal data in return for a better user experience. However, users' raw data usually contains implicit sensitive information that can be inferred by a third party. This raises great concern about users' privacy. In this dissertation, we develop novel techniques to achieve a better privacy-utility trade-off (PUT) in various applications. We first consider smart meter (SM) privacy and employ physical resources to minimize the information leakage to the SP through SM readings. We measure privacy using information-theoretic metrics and find private data release policies (PDRPs) by formulating the problem as a Markov decision process (MDP). We also propose noise injection techniques for time-series data privacy. We characterize optimal PDRPs measuring privacy via mutual information (MI) and utility loss via added distortion. Reformulating the problem as an MDP, we solve it using deep reinforcement learning (DRL) for real location trace data. We also consider a scenario for hiding an underlying ``sensitive'' variable and revealing a ``useful'' variable for utility by periodically selecting from among sensors to share the measurements with an SP. We formulate this as an optimal stopping problem and solve using DRL. We then consider privacy-aware communication over a wiretap channel. We maximize the information delivered to the legitimate receiver, while minimizing the information leakage from the sensitive attribute to the eavesdropper. We propose using a variational-autoencoder (VAE) and validate our approach with colored and annotated MNIST dataset. Finally, we consider defenses against active adversaries in the context of security-critical applications. We propose an adversarial example (AE) generation method exploiting the data distribution. We perform adversarial training using the proposed AEs and evaluate the performance against real-world adversarial attacks.
Baseline design of the filters for the LAD detector on board LOFT
Creators: name: Barbera, M.
name: Winter, B.
name: Coker, J.
name: Feroci, M.
name: Kennedy, T.
name: Walton, D.
name: Zane, S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The Large Observatory for X-ray Timing (LOFT) was one of the M3 missions selected for the phase A study in the ESA's Cosmic Vision program. LOFT is designed to perform high-time-resolution X-ray observations of black holes and neutron stars. The main instrument on the LOFT payload is the Large Area Detector (LAD), a collimated experiment with a nominal effective area of ~10 m 2 @ 8 keV, and a spectral resolution of ~240 eV in the energy band 2-30 keV. These performances are achieved covering a large collecting area with more than 2000 large-area Silicon Drift Detectors (SDDs) each one coupled to a collimator based on lead-glass micro-channel plates. In order to reduce the thermal load onto the detectors, which are open to Sky, and to protect them from out of band radiation, optical-thermal filter will be mounted in front of the SDDs. Different options have been considered for the LAD filters for best compromise between high quantum efficiency and high mechanical robustness. We present the baseline design of the optical-thermal filters, show the nominal performances, and present preliminary test results performed during the phase A study.
description: Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 914466
Fire resistance of lightweight engineered cementitious composite: Residual mechanical property and spalling behaviour
Creators: name: Deng, Bo-Yu
name: Li, Ling-Zhi
name: Yu, Ke-Quan
name: Uddin, Md Nasir
name: Yu, Hong-Jun
Publisher: name: figshare
Year: 2023
Subjects: Structural engineering
Fire safety engineering

description: Lightweight engineered cementitious composite cementitious composite (LWECC) is a special type of cement composite material with superior tensile performance, durability, and low self-weight. However, the fire resistance of LWECC is unknown and there is a lack of research in this aspect. This study aimed to study the residual mechanical property and spalling behaviour of LWECC after exposure to elevated temperature. The novel LWECC reinforced by PE fibres was developed by incorporating high-volume fly ash cenosphere (FAC) as lightweight fine aggregate. A total of 15 mixtures were tested to investigate the effects of silica fume (SF), FAC, polyethylene (PE) and polypropylene (PP) fibre on fire resistance experimentally. The introduction of PP fibres could effectively mitigate explosive spalling, while PE fibres failed to provide the benefit on spalling resistance. The SF and FAC had adverse influences on spalling resistance. The post-fire compressive strength began to decrease drastically when the temperature exceeds 800 °C. The work provides a promising way to develop high-performance LWECC with high fire resistance, which is helpful for fire resistance design of LWECC structures in the future.
Textauslegung und Satzstruktur in J. S. Bachs Motetten
Creators: name: Krummacher, Friedhelm
Publisher: name: Bach-Jahrbuch
Year: 2018

description: Obwohl Bachs Vokalwerk unbestreitbar durch seine konstruktiven Eigenschaften und seine expressiven Qualitäten gekennzeichnet ist, ist das wechselseitige Verhältnis dieser beiden Elemente keineswegs selbstverständlich. Angesichts der Tendenzen zur Trennung beider Aspekte ist es gerade ihre spezifische Korrelation, die geklärt werden muss. Für diese Frage können Bachs Motetten, ungeachtet ihrer Sonderstellung, als Beispiel dienen. Definiert durch die vokale Konzeption aller Stimmen, zeigen sie einen deutlichen Bruch mit der traditionellen Abfolge von Textelementen und entwickeln eigenständige zyklische Formstrukturen. Entsprechungen und Kontraste, Analogien und Varianten sowohl in Bezug auf deklamatorische, rhythmische, motivische und polyphone Verfahren sind die Grundvoraussetzungen für die Entwicklung einer komplexen formalen Struktur, die trotz textlicher Veränderungen und kraftvoller Interpretation einzelner Wörter unbestreitbar integer ist. Von daher werden Argumente für die Authentizität von BWV 230 sowie Schlussfolgerungen für weitere Vokalwerke entwickelt. (Übertragung des englischen Resümees am Ende des Bandes) Erwähnte Artikel: Bernhard Friedrich Richter: Über die Motetten Seb. Bachs. BJ 1912, S. 1-32 Arnold Schering: Bach und das Symbol, insbesondere die Symbolik seines Kanons. BJ 1925, S. 40-63 Arnold Schering: Bach und das Symbol (2. Studie). BJ 1928, S. 119-137 Joseph Bachmair: "Komm, Jesu, komm" (Der Textdichter. Ein unbekanntes Werk von Johann Schelle) BJ 1932, S. 142-145 Arnold Schering: Bach und das Symbol. 3. Studie: Psychologische Grundlegung des Symbolbegriffs aus Christian Wolffs "Psychologia empirica". BJ 1937, S. 83-95 Alfred Dürr: Zur Echtheit einiger Bach zugeschriebener Kantaten. BJ 1951-52, S. 30-46 Peter Benary: Zum periodischen Prinzip bei J. S. Bach. BJ 1958, S. 84-93 Ulrich Siegele: Bemerkungen zu Bachs Motetten. BJ 1962, S. 33-57 Roger Bullivant: Zum Problem der Begleitung der Bachschen Motetten. BJ 1966, S. 59-68 Martin Geck: Zur Echtheit der Bach-Motette "Lobet den Herrn, alle Heiden". BJ 1967, S. 57-69 Hans-Joachim Schulze: Der Schreiber "Anonymus 400" - ein Schüler Johann Sebastian Bachs. BJ 1972, S. 104-117
description: Bach-Jahrbuch, Bd. 60 (1974)
Sentiment Analysis Dataset in Moroccan Dialect: Bridging the Gap Between Arabic and Latin Scripted dialect
Creators: name: Jbel, Mouad
name: Jabrane, Mourad
name: Hafidi, Imad
name: Metrane, Abdulmutallib
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Sentiment analysis, the automated process of determining emotions or opinions expressed in text, has seen extensive exploration in the field of natural language processing. However, one aspect that has remained underrepresented is the sentiment analysis of the Moroccan dialect, which boasts a unique linguistic landscape and the coexistence of multiple scripts. Previous works in sentiment analysis primarily targeted dialects employing Arabic script. While these efforts provided valuable insights, they may not fully capture the complexity of Moroccan web content, which features a blend of Arabic and Latin script. As a result, our study emphasizes the importance of extending sentiment analysis to encompass the entire spectrum of Moroccan linguistic diversity. Central to our research is the creation of the largest public dataset for Moroccan dialect sentiment analysis that incorporates not only Moroccan dialect written in Arabic script but also in Latin letters. By assembling a diverse range of textual data, we were able to construct a dataset with a range of 20 000 manually labeled text in Moroccan dialect and also publicly available lists of stop words in Moroccan dialect. To dive into sentiment analysis, we conducted a comparative study on multiple Machine learning models to assess their compatibility with our dataset. Experiments were performed using both raw and preprocessed data to show the importance of the preprocessing step. We were able to achieve 92% accuracy in our model and to further prove its liability we tested our model on smaller publicly available datasets of Moroccan dialect and the results were favorable.
description: Lang Resources & Evaluation (2024)
Spielerische Elemente in J. S. Bachs Klaviermusik
Creators: name: Hering, Hans
Publisher: name: Bach-Jahrbuch
Year: 2018

description: Der Autor untersucht kompositorische Elemente in Bachs Clavierwerken, deren lineare Konstruktion als spezifisch idiomatisch bezeichnet werden kann: Fugen wie die in e-Moll (BWV 914), a-Moll (BWV 894 und 944) und die Teile der Goldberg-Variationen (BWV 988), deren Textur offensichtlich die Cembalotechnik widerspiegelt. Er kommt zu dem Schluss, dass in den Fugen der Schwerpunkt von der kontrapunktischen Intensität auf den motorischen Impuls einer bestimmten Einzelstimme verlagert wird - ohne jedoch die Konzentration auf thematisches Material aufzugeben. Auch in den Variationen wird die thematische Substanz in Figurationen eingebunden, ohne die grundlegende Variationsstruktur zu beeinträchtigen. (Übertragung des englischen Resümees am Ende des Bandes) Erwähnte Artikel: Reinhard Oppel: Die große A-moll-Fuge für Orgel und ihre Vorlage. BJ 1906, S. 78 August Halm: Über J. S. Bachs Konzertform. BJ 1919, S. 1-44 Hans Hering: J. S. Bachs Klaviertokkaten. BJ 1953, S. 81-96 Carl Dahlhaus: Bachs konzertante Fugen. BJ 1955, S. 45-72 Hans Hering: Bachs Klavierübertragungen. Ein Beitrag zur Klavieristik. BJ 1958, S. 94-113
description: Bach-Jahrbuch, Bd. 60 (1974)
Actively promoting student engagement within an online environment: Developing and implementing a signature subject on 'Contemporary Issues in Sex and Sexuality'
Creators: name: Fletcher, Gillian
name: Dowsett, Gary W
name: Austin, Lilian
Publisher: name: La Trobe
Year: 2023

description: La Trobe University is committed to improving the first year experience, and to developing its online teaching portfolio in response to increasing student demand. This article will acknowledge that these two objectives will remain contradictory if online learning systems are used predominantly as repositories of information with little thought given to their specific pedagogic possibilities. The article will then present a case study of an ‘Signature Subject’ that was developed to actively promote learner-material, learner-learner and learner-lecturer engagement in an entirely online environment, through use of synchronous and asynchronous sessions. Background to subject development will be provided, followed by discussion of challenges faced, responses to challenges and outcomes in terms of student response. The article will conclude by arguing that, as universities increase their use of online learning due to the changing university environment, this does not have to lead to reduced student engagement or poorer first year experiences.
Tonartliche Verwandtschaften im Klavierwerk J. S. Bachs
Creators: name: Siedentopf, Henning
Publisher: name: Bach-Jahrbuch
Year: 2018

description: Dass Werke, die in der gleichen Tonart geschrieben wurden, häufig auch in ihren melodischen Strukturen eine Ähnlichkeit aufweisen, kann als ein etabliertes Ergebnis der Bach-Forschung angesehen werden. Doch wenn Bach in seinen zyklischen Clavierwerken Sätze oder Satzgruppen, die verschiedene Tonarten repräsentieren, verbindet oder kontrastiert, stellt sich die Frage nach weitergehenden Beziehungen und Affinitäten zwischen divergierenden Tonarten. Tatsächlich zeigen Sätze, deren Tonika eine kleine Terz voneinander entfernt sind (z. B. C-Dur und A-Dur), häufig überraschende Ähnlichkeiten, auch wenn sie eine ganz andere kompositorische Ausarbeitung aufweisen. Die kleine Terz - bei Bach auch ein beliebtes Transpositionsintervall - offenbart sich als Mittel der musikalischen Dialektik. Der doppelte Kontrast (bei C-Dur und A-Dur: Bildung der parallelen Molltonart und Umwandlung dieser in Dur) erzeugt die verborgene Affinität. (Übertragung des englischen Resümees am Ende des Bandes)
description: Bach-Jahrbuch, Bd. 60 (1974)
The atmospheric entry of micrometeorites on Mars: Implications for their mineralogy, texture and organic constituents
Creators: name: Wilson, Aaron Peter
Publisher: name: Imperial College London
Year: 2021

description: The nature of martian micrometeorites (MMs) was investigated in this thesis through micro-analysis of terrestrial MMs and computational and experimental simulations of atmospheric entry heating. The biases in the Larkman Nunatak micrometeorite collection revealed in this study (Chapter 3) are attributed to the strong winnowing effects associated with sediment transport by aeolian processes. The weathering features observed in these micrometeorites are related to interaction with transient water. Sediment transport on Mars is dominated by aeolian processes, thus accumulations are likely to be similar to wind driven collections on Earth. However, their weathering state is expected to differ from terrestrial micrometeorites owing to the lack of water and much longer accumulation periods and is instead thought to be dominated by perchlorate induced oxidation. Computational simulations of atmospheric entry (Chapter 4) suggest much greater quantities of large, low temperature micrometeorites reaching the martian surface. The lower temperatures and larger particles surviving on Mars are likely to aid in the preservation of micrometeorite derived organic material with large portions of the micrometeorite flux expected to remain below the sublimation temperature of some organic compounds and larger particles allowing thermal gradients to form within particles. Experimental simulations (Chapter 5) indicate several differences between terrestrial and martian particles. Iron oxide phases were lacking in the martian particles including a magnetite rim, which is observed in the severely heated terrestrial particles. Additionally, sulphur and phosphorus are preserved in much greater quantities and in reduced forms in the martian particles. Raman spectroscopy also revealed that micrometeorite derived organic material on Earth experience greater evolution through the expansion of sp2 cluster diameter and growth of aromatic ring structures. Most of these features can be attributed to oxidative processes. Thus, atmospheric composition is thought to be a controlling factor in the nature micrometeorite derived organic material reaching a planetary surface.
Correspondence Packet, Window Replacement at Building 661, Randolph Air Force Base, Texas
Creators: name: Walter, Chelsea
Year: 1991
Subjects: subject: San Antonio
valueUri: https://core.tdar.org/browse/geographic-keyword/4149/san-antonio
subject: Bexar (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/4150/bexar-county
subject: Texas
valueUri: https://core.tdar.org/browse/geographic-keyword/6923/texas
subject: Randolph Air Force Base
valueUri: https://core.tdar.org/browse/geographic-keyword/78971/randolph-air-force-base
subject: Historic
valueUri: https://core.tdar.org/browse/culture-keyword/25/historic
subject: Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/318/governmental-structure
subject: Historic Governmental Structure
valueUri: https://core.tdar.org/browse/site-type/320/historic-governmental-structure
subject: Building 661
valueUri: https://core.tdar.org/browse/other-keyword/146442/building-661
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: A group of notes and letters on the proposed rehabilitation and replacement of the eighty original exterior windows at Building 661, Randolph Air Force Base, Texas.
Model-Driven Development of Complex Software: A Research Roadmap
Creators: name: France, Robert
name: Rumpe, Bernhard
Publisher: name: arXiv
Year: 2014
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: The term Model-Driven Engineering (MDE) is typically used to describe software development approaches in which abstract models of software systems are created and systematically transformed to concrete implementations. In this paper we give an overview of current research in MDE and discuss some of the major challenges that must be tackled in order to realize the MDE vision of software development. We argue that full realizations of the MDE vision may not be possible in the near to medium-term primarily because of the wicked problems involved. On the other hand, attempting to realize the vision will provide insights that can be used to significantly reduce the gap between evolving software complexity and the technologies used to manage complexity.
description: 18 pages
Zur Einordnung von J. S. Bachs einzeln überlieferten Orgelchorälen
Creators: name: Meyer, Ulrich
Publisher: name: Bach-Jahrbuch
Year: 2018

description: Dieser Artikel beschäftigt sich mit den von Klotz im Band IV/3 der NBA veröffentlichten Werken. Vermutlich vor den Siebzehn Chorälen entstanden etwa zwischen 1703 und 1709 folgende Werke: BWV 741, 700 und 735 unter dem Einfluss von Böhm; BWV 737, 724 und O Lamm Gottes, unschuldig unter dem Einfluss von Pachelbel; BWV 721, 718 und 720 unter dem Einfluss von Buxtehude. Vermutlich zur gleichen Zeit wie die Siebzehn Choräle und später wurden die folgenden Werke um 1709 bis 1717 komponiert: Choralbegleitungen und Lehrwerke BWV 715, 726, 722, 729, 732, 738, 725, 730, 706 und die Choralsätze in BWV 690, 695, 713, 734 und 736; Stücke unter dem Einfluss von Pachelbel BWV 712, 696-699, 701, 703, 704, 733, 736 (motivische Behandlung des Chorals), 694, 710, 717, 713, 695 (thematische Behandlung des Chorals), 711, 734 (regelmäßige Behandlung des Chorals); Choräle im Stil des Orgelbüchlein BWV 731,724,709 (koloristisch), 714 (kanonisch), 690 (zwischen Partita und Orgelbüchlein). In den Jahren 1720 bzw. 1722 nahm Bach BWV 691 und 728 in die Klavierbüchlein-Kopien auf. Der Autor hält O Lamm Gottes, unschuldig für authentisch, den hinzugefügten Choral jedoch für falsch zugeschrieben. - "Fantasia" kennzeichnet Orgelchoräle verschiedener Art in der Weimarer Zeit, großformatige Arrangements mit Cantus firmus im Bass solche der Leipziger Zeit. (Übertragung des englischen Resümees am Ende des Bandes) Erwähnte Artikel: Fritz Dietrich: J. S. Bachs Orgelchoral und seine geschichtlichen Wurzeln. BJ 1929, S. 1-89 Ulrich Meyer: Zur Frage der inneren Einheit von Bachs Siebzehn Chorälen (BWV 651-667). BJ 1972, S. 61-75
description: Bach-Jahrbuch, Bd. 60 (1974)