scholarly journals The Meteorite Collection in the Natural Science Museum of Turin

2009 ◽  
Vol 26 (3) ◽  
pp. 259-265
Author(s):  
E. Costa ◽  
L. M. Gallo
Keyword(s):  
High Resolution ◽  
Natural Science ◽  
Science Museum ◽  
Eastern European ◽  
Historical Importance ◽  
Ideal Tool ◽  
High Resolution Images ◽  
Almost All ◽  
The University ◽  
Selection Of

AbstractThe Natural Science Museum of Turin is the owner of a small but nice collection of meteorites, partly obtained by means of direct acquisition during the last 30 years, and partly inherited from the rather old collection of the University of Turin. This collection was partially forgotten for the last 50 years, and after 1936 the collection became almost invisible. In the last 30 years the meteorite samples were tightly packaged and retained in the basement of the museum building. Currently a new listing of the meteorite collection is in progress and almost finished, in which every sample is described, measured and weighed. For each sample the authors acquired high resolution images and examined historical documentations. Images were acquired with a desktop scanner, which was found to be an ideal tool for this purpose. A classification based on most famous meteorite catalogues is coupled to each description. About eighty samples (and probably a new meteorite, not described until now) will be depicted in the new catalogue, which hopefully will be published during 2009. The authors want to inform the international community that Turin the Museum holds an important collection containing almost all of the Piedmont meteorites (e.g. MOTTA DI CONTI, CERESETO, ALESSANDRIA), some Italian meteorites of considerable historical importance (TRONZANO, ALFIANELLO, ASSISI, SIENA), together with a selection of American and Eastern European samples.

scholarly journals Using multiple linear regression to disaggregate electricity consumption for cluster-metered academic buildings

2021 ◽  
Author(s):  
Nicholas So
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Electricity Consumption ◽  
Average Error ◽  
University Of Toronto ◽  
Ideal Tool ◽  
Building Characteristics ◽  
Academic Buildings ◽  
The University ◽  
Selection Of

Ryerson University does not have a means to gauge electricity consumption for half of their campus buildings. The installation of utility meters is outside of the University’s budget, a situation that may be similar across other academic institutions. A multiple linear regression approach to estimating consumption for academic buildings is an ideal tool that balances performance and utility. Using 80 buildings from Ryerson University and the University of Toronto, significant building characteristics were identified (from a selection of 18 variables) that show a strong linear relationship with electricity consumption. Four equations were created to represent the diversity in size of academic buildings. Tested using cross-validation, the coefficient of variation of the RMSE for all models was 33%, with a range of error between 20% and 43%. The models were highly successful at modeling electricity consumption at Ryerson University with an average error of 14.8% for five building clusters. Using metered data from each cluster, raw estimates for individual buildings were adjusted to improve accuracy.

scholarly journals Using multiple linear regression to disaggregate electricity consumption for cluster-metered academic buildings

2021 ◽  
Author(s):  
Nicholas So
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Electricity Consumption ◽  
Average Error ◽  
University Of Toronto ◽  
Ideal Tool ◽  
Building Characteristics ◽  
Academic Buildings ◽  
The University ◽  
Selection Of

Ryerson University does not have a means to gauge electricity consumption for half of their campus buildings. The installation of utility meters is outside of the University’s budget, a situation that may be similar across other academic institutions. A multiple linear regression approach to estimating consumption for academic buildings is an ideal tool that balances performance and utility. Using 80 buildings from Ryerson University and the University of Toronto, significant building characteristics were identified (from a selection of 18 variables) that show a strong linear relationship with electricity consumption. Four equations were created to represent the diversity in size of academic buildings. Tested using cross-validation, the coefficient of variation of the RMSE for all models was 33%, with a range of error between 20% and 43%. The models were highly successful at modeling electricity consumption at Ryerson University with an average error of 14.8% for five building clusters. Using metered data from each cluster, raw estimates for individual buildings were adjusted to improve accuracy.

Re-inventing the Ashmolean. Natural history and natural theology at Oxford in the 1820s to 1850s

2000 ◽  
Vol 27 (3) ◽  
pp. 369-406 ◽  
Author(s):  
ARTHUR MACGREGOR ◽  
ABIGAIL HEADON
Keyword(s):  
Nineteenth Century ◽  
Natural History ◽  
Natural Science ◽  
Natural Theology ◽  
Research Priorities ◽  
Science Museum ◽  
History Of ◽  
Extensive Body ◽  
Significant Figures ◽  
Almost All

During the period of the successive keeperships of John Shute Duncan (1823–1829) and his brother Philip Bury Duncan (1829–1854), the collections of the Ashmolean Museum at Oxford were comprehensively redisplayed as a physical exposition of the doctrines of natural theology, specifically as propounded by William Paley. The displays assembled by the Duncans, overwhelmingly dominated by natural history specimens, were swept away with the opening of the University's new Natural Science Museum and with them went almost all recollection of an extraordinary chapter in museum history. From largely unpublished records in the Ashmolean, the Duncans' achievement is here reconstructed. The primary evidence is provided by contemporary reports prepared for the Visitors of the Museum and by surviving texts from the Duncans' museum labels. Additional perspectives are provided by an extensive body of correspondence from the collectors, explorers and others who contributed specimens to the new displays: their texts illuminate aspects of contemporary preoccupations with classification, broader research priorities, and problems associated with collecting, preserving and transporting specimens, as well as shedding light on individual exhibits which they contributed to the Museum. These correspondents include a number of significant figures in the nineteenth century history of natural history, including Andrew Bloxam, N. A. Vigors and William Burchell.

scholarly journals Taxonomy of the ant genus Carebara Westwood (Formicidae, Myrmicinae) in the Malagasy Region

ZooKeys ◽  
2018 ◽  
Vol 767 ◽  
pp. 1-149
Author(s):  
Frank Azorsa ◽  
Brian Fisher
Keyword(s):  
High Resolution ◽  
Open Access ◽  
Natural History ◽  
The Other ◽  
Major Worker ◽  
Distribution Maps ◽  
History Of ◽  
High Resolution Images ◽  
Almost All ◽  
Worker Caste

The genus Carebara is revised for the Malagasy region, and based on the examination of over 10,000 specimens, twenty-three species are recognized. Twenty one of these are described as new (C.bara sp. n., C.berivelo sp. n., C.betsi sp. n., C.creolei sp. n., C.demeter sp. n., C.dota sp. n., C.hainteny sp. n., C.hiragasy sp. n., C.jajoby sp. n., C.kabosy sp. n., C.lova sp. n., C.mahafaly sp. n., C.malagasy sp. n., C.omasi sp. n., C.placida sp. n., C.raberi sp. n., C.salegi sp. n., C.sampi sp. n., C.tana sp. n., C.tanana sp. n., C.vazimba sp. n.), and two are redescribed, C.grandidieri Forel (= C.voeltzkowi Forel n. syn.) and C.nosindambo Forel. A lectotype is designated for C.nosindambo. C.creolei sp. n. is known only from Mauritius and Seychelles, C.grandidieri Forel is distributed in Comoros, Madagascar and Mayotte, and the other twenty-one species are endemic to Madagascar. Most of the Carebara species recorded in this work are endemic to a specific habitat (ecoregion), but some of them (C.bara sp. n., C.grandidieri Forel, C.jajoby sp. n., C.kabosy sp. n., and C.nosindambo Forel) are widespread within Madagascar across all major habitats. The worker caste of Carebara can be differentiated from other genera in the Myrmicinae subfamily by the presence of the following combination of characters: antennae of eight to eleven segments, with a two-segmented club; anterior clypeal margin without central isolated seta (rarely present in some species or specimens), and usually with four distinct setae; mandibles with four to seven teeth (except in one species from Ghana - C.crigensis with three teeth); and palp formula 2,2 or 1,2. We report that almost all Carebara species found in the Malagasy region have intermediates (distinct forms) in the major worker subcaste, with the largest major workers showing remnants of queen flight sclerites and ocelli. The widespread presence of intermediates in the major worker subcaste expands the morphological boundaries of Carebara. We present an overview of the natural history of Carebara in the Malagasy region, an illustrated key for the identification of the known Malagasy species of Carebara, as well as high-resolution images and distribution maps. Unique identifiers are used for all specimens studied, including type material, and the raw data that forms the basis of this study are available on www.antweb.org (open access).

scholarly journals ARCHETYPAL ANALYSIS: AN ALTERNATIVE TO CLUSTERING FOR UNSUPERVISED TEXTURE SEGMENTATION

2019 ◽  
Vol 38 (2) ◽  
pp. 151 ◽  
Author(s):  
Ismael Cabero ◽  
Irene Epifanio
Keyword(s):  
Remote Sensing ◽  
High Resolution ◽  
Remote Sensing Image ◽  
Texture Segmentation ◽  
Textural Features ◽  
Archetypal Analysis ◽  
Natural Landscapes ◽  
High Resolution Images ◽  
Selection Of

Texture segmentation is one of the main tasks in image applications, specifically in remote sensing, where the objective is to segment high-resolution images of natural landscapes into different cover types. Often the focus is on the selection of discriminant textural features, and although these are really fundamental, there is another part of the process that is also influential, partitioning different homogeneous textures into groups. A methodology based on archetype analysis (AA) of the local textural measurements is proposed. AA seeks the purest textures in the image and it can find the borders between pure textures, as those regions composed of mixtures of several archetypes. The proposed procedure has been tested on a remote sensing image application with local granulometries, providing promising results.

FeXIV Line Emission Polarization of the July 11, 1991 Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 541-547
Author(s):  
J. Sýkora ◽  
J. Rybák ◽  
P. Ambrož
Keyword(s):  
High Resolution ◽  
Solar Corona ◽  
Emission Line ◽  
Solar Eclipse ◽  
White Light ◽  
Preliminary Analysis ◽  
Line Emission ◽  
Total Solar Eclipse ◽  
Degree Of Polarization ◽  
High Resolution Images

AbstractHigh resolution images, obtained during July 11, 1991 total solar eclipse, allowed us to estimate the degree of solar corona polarization in the light of FeXIV 530.3 nm emission line and in the white light, as well. Very preliminary analysis reveals remarkable differences in the degree of polarization for both sets of data, particularly as for level of polarization and its distribution around the Sun’s limb.

Remarks on the application of backscattered electron imaging (BEI) to the scanning electron microscopy (SEM) of biological structures

1983 ◽  
Vol 41 ◽  
pp. 484-487
Author(s):  
Etienne de Harven
Keyword(s):  
High Resolution ◽  
Incident Beam ◽  
Spot Size ◽  
Primary Electron ◽  
Critical Point Drying ◽  
Cell Shapes ◽  
High Resolution Images ◽  
Backscattered Electron ◽  
Electron Imaging ◽  
Scanning Electron

Biological ultrastructures have been extensively studied with the scanning electron microscope (SEM) for the past 12 years mainly because this instrument offers accurate and reproducible high resolution images of cell shapes, provided the cells are dried in ways which will spare them the damage which would be caused by air drying. This can be achieved by several techniques among which the critical point drying technique of T. Anderson has been, by far, the most reproducibly successful. Many biologists, however, have been interpreting SEM micrographs in terms of an exclusive secondary electron imaging (SEI) process in which the resolution is primarily limited by the spot size of the primary incident beam. in fact, this is not the case since it appears that high resolution, even on uncoated samples, is probably compromised by the emission of secondary electrons of much more complex origin.When an incident primary electron beam interacts with the surface of most biological samples, a large percentage of the electrons penetrate below the surface of the exposed cells.

Field Emission SEM Equipped With Noise Compensator

1973 ◽  
Vol 31 ◽  
pp. 302-303
Author(s):  
S. Saito ◽  
H. Todokoro ◽  
S. Nomura ◽  
T. Komoda
Keyword(s):  
Electron Microscope ◽  
High Resolution ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Low Contrast ◽  
Probe Current ◽  
High Resolution Images ◽  
Scanning Electron

Field emission scanning electron microscope (FESEM) features extremely high resolution images, and offers many valuable information. But, for a specimen which gives low contrast images, lateral stripes appear in images. These stripes are resulted from signal fluctuations caused by probe current noises. In order to obtain good images without stripes, the fluctuations should be less than 1%, especially for low contrast images. For this purpose, the authors realized a noise compensator, and applied this to the FESEM.Fig. 1 shows an outline of FESEM equipped with a noise compensator. Two apertures are provided gust under the field emission gun.

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