scholarly journals Conservation Principles and Performance Based Strengthening of Heritage Buildings in Post-event Reconstruction

2014 ◽  
pp. 489-514 ◽  
Author(s):  
Dina D’Ayala
Keyword(s):  
Event Reconstruction ◽  
Heritage Buildings ◽  
Conservation Principles ◽  
And Performance

scholarly journals H-BIM AND THE DOMAINS OF DATA INVESTIGATIONS OF HERITAGE BUILDINGS CURRENT STATE OF THE ART

2019 ◽  
Vol XLII-2/W11 ◽  
pp. 661-667 ◽  
Author(s):  
A. Khalil ◽  
S. Stravoravdis
Keyword(s):  
Structural Integrity ◽  
Solid Base ◽  
Building Performance ◽  
Intermediate Point ◽  
Current State ◽  
Heritage Buildings ◽  
Heritage Building ◽  
Variable Morphology ◽  
And Performance ◽  
Investigation Process

<p><strong>Abstract.</strong> Heritage BIM can represent many advantages for heritage building documentation, restoration, retrofitting and management. However, the most complicated challenge concerning H-BIM is the inevitability of starting at an intermediate point in the asset’s life cycle, which can be much more complex than the relatively straightforward cradle-to-grave model that describes new-build construction (Historic England, 2017). This leads to irregular geometry, non-homogeneous materials, variable morphology, not documented changes, damage and various stages of construction. These challenges put more weight on the surveying, documentation, modelling and visualisation phase within the process of HBIM.</p><p>Many investigation tools can be used and combined to document and investigate the fabric of historic buildings. This paper reviews the literature and the state of art of the different domains of data that could be included in the documentation and investigation process of the built heritage, in order to assess the breadth and depth by which heritage buildings can be documented. These data can vary from outer geometry survey, to sub-surface materials and structural integrity investigations, to data concerning the building performance, as well as the historic records concerning the building`s morphology over time, which can help to create a more in-depth knowledge about the heritage buildings` status and performance and can create a solid base for any required restoration and retrofitting processes.</p>

The future adaptivity of nineteenth century heritage buildings

2017 ◽  
Vol 35 (4) ◽  
pp. 332-347 ◽  
Author(s):  
Sheila Conejos ◽  
Michael Y.L. Chew ◽  
Esther H.K. Yung
Keyword(s):  
Nineteenth Century ◽  
Environmental Sustainability ◽  
Design Methodology ◽  
Built Environments ◽  
Urban Context ◽  
Content Type ◽  
Built Heritage ◽  
The Future ◽  
Heritage Buildings ◽  
Conservation Principles

Purpose Designing for the future sustainability and adaptability of building assets contributes to waste and emission reduction. Moreover, sustainable design and conservation principles are necessary for achieving sustainable and adaptable built heritage. The purpose of this paper is to introduce the improved adaptSTAR model in regards to maximising the future adaptive reuse and sustainability of existing built heritage and its surroundings. Design/methodology/approach A comparative study of two iconic nineteenth century heritage assets in Australia and Hong Kong is undertaken to highlight the need to forecast the future adaptation of heritage buildings in order to guarantee their continuous reuse and sustainability in an urban context. Findings Findings show that the functional, technological and legal attributes of these two nineteenth century heritage buildings require improvement so as to ensure their future adaptivity. The upgrading of heritage buildings for environmental sustainability is also deemed necessary. Originality/value The originality of this paper pertains to the advancement of the adaptSTAR tool in evaluating the future adaptivity of existing built heritage as well as new built environments whilst considering their economic, environmental and social values.

Design Guidelines for Buildings in Saudi Arabia Considering Energy Conservation Requirements

2014 ◽  
Vol 548-549 ◽  
pp. 1601-1606 ◽  
Author(s):  
Abdullah. M Al-Shaalan ◽  
Wakeel Ahmed ◽  
Abdulhameed Alohaly
Keyword(s):  
Saudi Arabia ◽  
Energy Conservation ◽  
Performance Standards ◽  
Design Guidelines ◽  
Design Parameters ◽  
Kingdom Of Saudi Arabia ◽  
The Past ◽  
Prime Objective ◽  
Conservation Principles ◽  
And Performance

In Kingdom of Saudi Arabia (KSA), the contribution from buildings towards energy consumption, both residential and commercial, has steadily increased reaching figures of 35% to 40% in the past few years. For this reason, energy efficiency in buildings is a prime objective for energy policy at regional, national and international levels. This research aims to provide design guidelines for buildings in Saudi Arabia taking into consideration the energy conservation principles. The proposed design parameters/guidelines are supported by computer simulation results of the software named “eQUEST” (Quick Energy Simulation Tool). This paper specifies minimum thermal resistance for walls and roofs, size and quality for glazing and performance standards for air conditioning (AC) systems.

scholarly journals Collision of built heritage revitalisation principles and "design for all"

2014 ◽  
Vol 12 (2) ◽  
pp. 133-148
Author(s):  
Natasa Zivaljevic-Luxor ◽  
Petar Mitkovic ◽  
Nadja Kurtovic-Folic
Keyword(s):  
Cultural Heritage ◽  
World Wide ◽  
Social Groups ◽  
Future Generations ◽  
Built Heritage ◽  
Design For All ◽  
Heritage Buildings ◽  
Conservation Principles ◽  
The Eu ◽  
Barrier Free

Nine briefly examined examples of built heritage in this paper reveal various cases of collision of conservation principles with demands of barrier-free architecture. The importance of this issue has been raised in the light of increasing world-wide efforts to preserve cultural heritage buildings for future generations by revitalization and strong efforts, in particularly in the EU, to reach higher standards in inclusion of all social groups.

scholarly journals Multisensor Data Fusion for Localization of Pollution Sources in Wastewater Networks

Sensors ◽  
2022 ◽  
Vol 22 (1) ◽  
pp. 387
Author(s):  
Krystian Chachuła ◽  
Tomasz Michał Słojewski ◽  
Robert Nowak
Keyword(s):  
Data Fusion ◽  
Wastewater Treatment Plants ◽  
Fusion Algorithm ◽  
Network Nodes ◽  
Heterogeneous Sensors ◽  
Multisensor Data Fusion ◽  
Event Reconstruction ◽  
Adaptive Peak ◽  
And Performance ◽  
Multisensor Data

Illegal discharges of pollutants into sewage networks are a growing problem in large European cities. Such events often require restarting wastewater treatment plants, which cost up to a hundred thousand Euros. A system for localization and quantification of pollutants in utility networks could discourage such behavior and indicate a culprit if it happens. We propose an enhanced algorithm for multisensor data fusion for the detection, localization, and quantification of pollutants in wastewater networks. The algorithm processes data from multiple heterogeneous sensors in real-time, producing current estimates of network state and alarms if one or many sensors detect pollutants. Our algorithm models the network as a directed acyclic graph, uses adaptive peak detection, estimates the amount of specific compounds, and tracks the pollutant using a Kalman filter. We performed numerical experiments for several real and artificial sewage networks, and measured the quality of discharge event reconstruction. We report the correctness and performance of our system. We also propose a method to assess the importance of specific sensor locations. The experiments show that the algorithm’s success rate is equal to sensor coverage of the network. Moreover, the median distance between nodes pointed out by the fusion algorithm and nodes where the discharge was introduced equals zero when more than half of the network nodes contain sensors. The system can process around 5000 measurements per second, using 1 MiB of memory per 4600 measurements plus a constant of 97 MiB, and it can process 20 tracks per second, using 1.3 MiB of memory per 100 tracks.

scholarly journals The CMS Particle Flow Algorithm

2018 ◽  
Vol 191 ◽  
pp. 02016
Author(s):  
Milos Dordevic
Keyword(s):  
Transverse Energy ◽  
Hadron Collider ◽  
Particle Flow ◽  
Tau Leptons ◽  
Missing Transverse Energy ◽  
Final State ◽  
Event Reconstruction ◽  
Flow Algorithm ◽  
And Performance ◽  
Traditional Approaches

The event reconstruction at the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider (LHC) is predominantly based on the Particle Flow algorithm. This algorithm for a global event description uses the information from all subdetector systems, unlike the previous, traditional approaches that were focused on the localized information in each subdetector. These traditional methods use the raw information (tracks, hits), while the Particle Flow algorithm completely reconstructs the event by identifying and reconstructing the comprehensive list of final-state particles (photons, electrons, muons, charged and neutral hadrons), resulting in superior reconstruction of jets, missing transverse energy, tau leptons, electrons and muons. This approach also allows for efficient identification and mitigation of the pileup effect. The concept and performance of the Particle Flow algorithm, together with the prospects for its development in the context of the upgraded CMS detector, are presented in this overview.

Transmission Scanning Electron Microscopy and Energy Analysis with the Siemens ELMISKOP 101

1972 ◽  
Vol 30 ◽  
pp. 450-451
Author(s):  
H. M. Thieringer
Keyword(s):  
Objective Lens ◽  
Transmission Microscopy ◽  
Image Recording ◽  
Mode Of Operation ◽  
Scanning Transmission ◽  
Electron Microscopes ◽  
And Performance ◽  
Convergent Beam ◽  
Ray Path ◽  
Beam Diffraction

It has repeatedly been show that with conventional electron microscopes very fine electron probes can be produced, therefore allowing various micro-techniques such as micro recording, X-ray microanalysis and convergent beam diffraction. In this paper the function and performance of an SIEMENS ELMISKOP 101 used as a scanning transmission microscope (STEM) is described. This mode of operation has some advantages over the conventional transmission microscopy (CTEM) especially for the observation of thick specimen, in spite of somewhat longer image recording times.Fig.1 shows schematically the ray path and the additional electronics of an ELMISKOP 101 working as a STEM. With a point-cathode, and using condensor I and the objective lens as a demagnifying system, an electron probe with a half-width ob about 25 Å and a typical current of 5.10-11 amp at 100 kV can be obtained in the back focal plane of the objective lens.

Angular Resolved Electron Spectroscopy with Parallel Recording

1990 ◽  
Vol 48 (2) ◽  
pp. 370-371
Author(s):  
Huang Min ◽  
P.S. Flora ◽  
C.J. Harland ◽  
J.A. Venables
Keyword(s):  
Electron Spectroscopy ◽  
Low Voltage ◽  
Solid Angle ◽  
Detection System ◽  
Voltage Electron ◽  
Cylindrical Mirror ◽  
Inner Radius ◽  
Channel Plate ◽  
And Performance ◽  
Type Detector

A cylindrical mirror analyser (CMA) has been built with a parallel recording detection system. It is being used for angular resolved electron spectroscopy (ARES) within a SEM. The CMA has been optimised for imaging applications; the inner cylinder contains a magnetically focused and scanned, 30kV, SEM electron-optical column. The CMA has a large inner radius (50.8mm) and a large collection solid angle (Ω > 1sterad). An energy resolution (ΔE/E) of 1-2% has been achieved. The design and performance of the combination SEM/CMA instrument has been described previously and the CMA and detector system has been used for low voltage electron spectroscopy. Here we discuss the use of the CMA for ARES and present some preliminary results.The CMA has been designed for an axis-to-ring focus and uses an annular type detector. This detector consists of a channel-plate/YAG/mirror assembly which is optically coupled to either a photomultiplier for spectroscopy or a TV camera for parallel detection.

Novel epoxy/anhydride alternatives for biological electron microscopy: Physical and performance characteristis of embed 812 and LX 112 in combination with NSA/NMA/DMAE

1989 ◽  
Vol 47 ◽  
pp. 1000-1001
Author(s):  
Joe A. Mascorro ◽  
Gerald S. Kirby
Keyword(s):  
Electron Microscopy ◽  
Flow Rate ◽  
Succinic Anhydride ◽  
Volume Flow Rate ◽  
Mass Density ◽  
Uranyl Acetate ◽  
Volume Flow ◽  
Base Resin ◽  
And Performance ◽  
Acid Anhydrides

Embedding media based upon an epoxy resin of choice and the acid anhydrides dodecenyl succinic anhydride (DDSA), nadic methyl anhydride (NMA), and catalyzed by the tertiary amine 2,4,6-Tri(dimethylaminomethyl) phenol (DMP-30) are widely used in biological electron microscopy. These media possess a viscosity character that can impair tissue infiltration, particularly if original Epon 812 is utilized as the base resin. Other resins that are considerably less viscous than Epon 812 now are available as replacements. Likewise, nonenyl succinic anhydride (NSA) and dimethylaminoethanol (DMAE) are more fluid than their counterparts DDSA and DMP- 30 commonly used in earlier formulations. This work utilizes novel epoxy and anhydride combinations in order to produce embedding media with desirable flow rate and viscosity parameters that, in turn, would allow the medium to optimally infiltrate tissues. Specifically, embeding media based on EmBed 812 or LX 112 with NSA (in place of DDSA) and DMAE (replacing DMP-30), with NMA remaining constant, are formulated and offered as alternatives for routine biological work.Individual epoxy resins (Table I) or complete embedding media (Tables II-III) were tested for flow rate and viscosity. The novel media were further examined for their ability to infilftrate tissues, polymerize, sectioning and staining character, as well as strength and stability to the electron beam and column vacuum. For physical comparisons, a volume (9 ml) of either resin or media was aspirated into a capillary viscocimeter oriented vertically. The material was then allowed to flow out freely under the influence of gravity and the flow time necessary for the volume to exit was recored (Col B,C; Tables). In addition, the volume flow rate (ml flowing/second; Col D, Tables) was measured. Viscosity (n) could then be determined by using the Hagen-Poiseville relation for laminar flow, n = c.p/Q, where c = a geometric constant from an instrument calibration with water, p = mass density, and Q = volume flow rate. Mass weight and density of the materials were determined as well (Col F,G; Tables). Infiltration schedules utilized were short (1/2 hr 1:1, 3 hrs full resin), intermediate (1/2 hr 1:1, 6 hrs full resin) , or long (1/2 hr 1:1, 6 hrs full resin) in total time. Polymerization schedules ranging from 15 hrs (overnight) through 24, 36, or 48 hrs were tested. Sections demonstrating gold interference colors were collected on unsupported 200- 300 mesh grids and stained sequentially with uranyl acetate and lead citrate.

Trace nanoanalysis

1994 ◽  
Vol 52 ◽  
pp. 940-941
Author(s):  
D. E. Newbury ◽  
R. D. Leapman
Keyword(s):  
High Performance ◽  
Secondary Ion Mass Spectrometry ◽  
Detection Efficiency ◽  
Volume Element ◽  
And Performance ◽  
Trace Constituents ◽  
Secondary Ion ◽  
Concentration Levels ◽  
Structure Properties

Trace constituents, which can be very loosely defined as those present at concentration levels below 1 percent, often exert influence on structure, properties, and performance far greater than what might be estimated from their proportion alone. Defining the role of trace constituents in the microstructure, or indeed even determining their location, makes great demands on the available array of microanalytical tools. These demands become increasingly more challenging as the dimensions of the volume element to be probed become smaller. For example, a cubic volume element of silicon with an edge dimension of 1 micrometer contains approximately 5×1010 atoms. High performance secondary ion mass spectrometry (SIMS) can be used to measure trace constituents to levels of hundreds of parts per billion from such a volume element (e. g., detection of at least 100 atoms to give 10% reproducibility with an overall detection efficiency of 1%, considering ionization, transmission, and counting).

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