The London Metropolitan Archives (LMA) is the principal local government archive repository for the Greater London area, including the City of London: it is the largest county record office in the United Kingdom. It was established under its present name in 1997, having previously been known as the Greater London Record Office. It is administered and financed by the City of London Corporation.The archive is based at 40 Northampton Road, Clerkenwell, London. It attracts over 30,000 visitors a year and deals with a similar number of written enquiries. LMA's extensive holdings amount to over 72 miles of records of local, regional and national importance. With the earliest record dating from 1067, the archive charts the development of the capital into a modern-day major world city..
This paper presents a method to map out the behavior of a multistable dynamical system. The method outputs the boundaries of the stability regions of each multistable regime in the space of system parameters. Boundaries are produced by Support Vector Machines models. Adaptive sampling is used to improve speed and generalization to high dimensions. The method is general to any dynamical system with distinguishable multistable regimes. It is applied to a clarinet model with four distinct regimes (equilibrium and three distinct periodic notes). The cartography shows that, on the highest fingerings, the simple clarinet model only favors the expected note for very narrow ranges of reed parameters.
ThomX is a compact x-ray source based on Compton scattering, installed at IJCLab (Laboratoire de physique des 2 infinis-Irène Joliot-Curie) in Orsay. The machine uses a small electron storage ring and an intense laser pulse stored in a high-finesse optical cavity. This article describes the various subsystems of the machine and their initial results of the commissioning, which began in mid-2021. This first commissioning phase led to the production of 1010 x-rays/s with an on-axis energy of 45 keV. The main steps to be taken to reach the nominal flux are outlined at the end. Published by the American Physical Society 2025
Archival boxes are used as a preventive measure to control the microenvironment in museums and archives storages. However, their efficiency in protecting valuable artefacts from fluctuations in relative humidity (RH) is not yet fully understood. In this study, the environmental performance of different archival boxes with different configurations (size, design, presence of holes/paper material, cardboard types, surface modification) was included in the evaluation of internal environment (RH). The effectiveness of archival boxes on reducing relative humidity fluctuations was investigated by testing various properties of boxes and boards, such as air exchange rates (AER), moisture sorption and water vapour transmission rates (WVTR). While most cardboard boxes showed only a limited buffering against the humidity ingress, strategies such as surface modification limited the interaction of a box with the external environment, resulting in a more stable internal environment. Material and box properties, such as moisture sorption, AER and WVTR proved to be useful quantitative tools for assessing the environmental performance of the selected archival boxes.
Introduction The micro-CT obtain very high-quality of the aortic roots and three-dimensional modeling of aortic leaflets. Different tests (biaxial test) are used to know the biomechanical properties. We propose a new method, which combines pressurization of the aortic root with micro-CT to obtain at the same time, the geometry, and biomechanical properties. Objective The aim is to investigate healthy aorta mechanical property using a micro-CT under pressure and compare them with literature. Methods This study was approved by committee on human research at the French agency of biomedicine (PFFS 20-026). Ten aortic roots were obtained fresh from unused donor hearts with non-cardiac causes of death. We used aortic root under pressure at different pressure level (every 20mmHg) in order to obtain diameter, geometry, stress-strain curve and Young modulus. Results All aortic roots (n=10) obtained a three-dimensional modeling of aortic leaflets with excellent quality. The mean age was 61.2years [49.5–65.6]. The median of sino-tubular junction diameter was 32.2mm [29–36] at 80mmHg. The non-linear stress-strain curves of healthy aortic root were characterized. Young moduli were significantly smaller in low pressure (between 20 and 80mmHg) 0.6 [0.5–0.8] MPa than high pressure (between 80 and 120mmHg) 3.2 [2.5–5.6] MPa, P=0.001 (Fig. 1). Conclusion Our new method allows a 3D model of the aortic root associated with measurements of biomechanical properties. Our results are found to be consistent with literature data. This new method evaluates the biomechanical properties while keeping the aortic roots intact and maintaining its geometrical complexity for future global aortic root simulation.
In this paper, we use the classical Lie group method, to investigate the symmetries of the heat transfer flow of a third-grade fluid. This approach allows one to reduce the coupled partial differential equations governing the problem, to a system of nonlinear ordinary differential equations. Point symmetries of such systems are used to construct some classes of solutions. By using travelling wave solutions, we studied the influence of third-grade fluid parameters on the flow.
