The illusory plastic space of Hagia Sophia

2021 ◽  
Vol 25 (2) ◽  
pp. 145-176
Author(s):  
David Walker
Keyword(s):  
Plastic State ◽  
Visual Study ◽  
Hagia Sophia ◽  
The Subject ◽  
Enclosed Space

The purpose of this article is to celebrate the exquisite moments when enclosed space at Hagia Sophia attains an illusory plastic state. The subject is the secularised amalgamation of the Byzantine cathedral of Hagia Sophia and the Turkish mosque of Ayasofya, prior to the restoration of the mosque in 2020. The article is intended as a visual study of intrinsic visual qualities, without the use of seductive imagery.

Evaluation of Agricultural Rescue Course by Providers

1996 ◽  
Vol 11 (3) ◽  
pp. 234-238 ◽  
Author(s):  
Dean T. Stueland ◽  
John E. McCarty ◽  
Peter Stamas ◽  
Paul D. Gunderson
Keyword(s):  
Prehospital Care ◽  
Emergency Medical Technicians ◽  
Study Objective ◽  
Education Practice ◽  
Agricultural Injuries ◽  
Emergency Medical ◽  
The Subject ◽  
Level Of Training ◽  
Enclosed Space ◽  
Tractor Overturn

AbstractStudy objective:To assess the characteristics of rural emergency medical services providers involved in the prehospital care of victims of agricultural injuries and determine which aspects of an agricultural rescue course were perceived as most useful.Design:A questionnaire was sent to participants of a course designed for agricultural prehospital providers who had attended a farm accident rescue course between 1986 and 1993.Setting:A rural referral center in central Wisconsin.Participants:The questionnaire was sent to all persons who had participated in the course. Respondents to the questionnaire characterized their service experience and rated the topic areas in usefulness and whether the subject should be included in future courses.Results:A total of 459 surveys (44% of potential respondents) was returned. Of the respondents, 316 (74.4%) were men, and the mean age was 39.4 years. There were 247 (60.8%) who were volunteers, and an additional 126 (31%) were paid, on-call workers. There were 232 (56.4%) basic providers, and 365 (87.5%) were from a rural area. Many (n = 149; 36.9%) had not responded to farm accidents during the past year. Training course topics rated most useful were machinery extrication, tractor overturn, and enclosed-space rescue.Conclusions:Respondents to an evaluation of an agricultural rescue course primarily were rural, basic providers. Future development of courses for emergency medical technicians involved in agriculture rescue must account for this level of training. Such courses should be short and modular with an emphasis on continuing education, practice, and focus on the identified needs of the participants.

Vulcanization of Rubber by Means of Resins

1963 ◽  
Vol 36 (1) ◽  
pp. 268-281 ◽  
Author(s):  
Claude Thelamon
Keyword(s):  
Steric Structure ◽  
Radical Reactions ◽  
Plastic State ◽  
Elastic State ◽  
Tetramethylthiuram Disulfide ◽  
The Third ◽  
Sulfur Chloride ◽  
Bifunctional Compounds ◽  
Sulfur Vulcanization ◽  
The Subject

Abstract Vulcanization has been the subject of much careful research since its discovery by Goodyear in 1840. Originally “vulcanization” meant a treatment of rubber with sulfur and heat, but now the word has a much broader connotation, since it has been discovered that numerous substances can produce the same effect as sulfur. Vulcanization is the process by which rubber passes from the predominantly plastic state to a predominantly elastic state by means of an irreversible transformation. This phenomenon is due to the formation of intermolecular bridges, leading to a more or less dense steric structure. Materials capable of vulcanizing rubber can be classified in three large categories: 1. Compounds which liberate sulfur during vulcanization, e.g., sulfur chloride and tetramethylthiuram disulfide. It is thought that nascent sulfur is particularly active, giving rise to the formation of crosslinks. 2. Compounds inducing vulcanization by means of radical reactions, such as peroxides. 3. Bifunctional compounds, among which phenol/formaldhyde derivatives seem to be the most interesting. Materials in the third group will be the object of this study.

Children’s Graffiti in Roman Pompeii and Herculaneum

2018 ◽  
Author(s):  
Katherine V. Huntley
Keyword(s):  
Material Culture ◽  
Subject Matter ◽  
Unique Type ◽  
Youth Organization ◽  
Roman World ◽  
Public Areas ◽  
The Subject ◽  
Enclosed Space

The realities of childhood in the Roman world have been difficult to access archaeologically, in part because Roman children lacked a distinctive material culture. The remains of Pompeii and Herculaneum have yielded a somewhat unique type of evidence for children’s lives: graffiti. The chapter will explore how the location and subject matter of the graffiti reveal the realities of children’s lives, including the activities they participated in, the things that interested them, and their relationships with caretakers and peers. The chapter will also look at public areas where children’s graffiti turn up, focusing in particular on Pompeii’s Grand Palaestra, an enclosed space associated with the city’s youth organization. Finally, trends in the subject matter of the children’s graffiti attest to some of the things children frequently encountered and that help particular interest for them.

Words

PMLA ◽  
1935 ◽  
Vol 50 (4) ◽  
pp. 1320-1327
Author(s):  
Colbert Searles
Keyword(s):  
Subject Matter ◽  
Assistant Professor ◽  
The Subject

THE germ of that which follows came into being many years ago in the days of my youth as a university instructor and assistant professor. It was generated by the then quite outspoken attitude of colleagues in the “exact sciences”; the sciences of which the subject-matter can be exactly weighed and measured and the force of its movements mathematically demonstrated. They assured us that the study of languages and literature had little or nothing scientific about it because: “It had no domain of concrete fact in which to work.” Ergo, the scientific spirit was theirs by a stroke of “efficacious grace” as it were. Ours was at best only a kind of “sufficient grace,” pleasant and even necessary to have, but which could, by no means ensure a reception among the elected.

Artificial satellite orbit computations

1966 ◽  
Vol 25 ◽  
pp. 363-371
Author(s):  
P. Sconzo
Keyword(s):  
Artificial Satellite ◽  
Satellite Orbit ◽  
Artificial Satellites ◽  
Orbital Elements ◽  
Differential Correction ◽  
Gravitational Effects ◽  
Short Intervals ◽  
The Subject ◽  
Introductory Discussion ◽  
Orbit Computation

In this paper an orbit computation program for artificial satellites is presented. This program is operational and it has already been used to compute the orbits of several satellites.After an introductory discussion on the subject of artificial satellite orbit computations, the features of this program are thoroughly explained. In order to achieve the representation of the orbital elements over short intervals of time a drag-free perturbation theory coupled with a differential correction procedure is used, while the long range behavior is obtained empirically. The empirical treatment of the non-gravitational effects upon the satellite motion seems to be very satisfactory. Numerical analysis procedures supporting this treatment and experience gained in using our program are also objects of discussion.

C. Wire Cabling for Telescope Systems

1966 ◽  
Vol 27 ◽  
pp. 159-161
Keyword(s):  
The Subject ◽  
Data Multiplexing

Rule: I'd like at this point to bring up the subject of cables and wireways around the telescope. We've touched upon this twice during previous sessions: the cable wrap up problem, the communications problem, and data multiplexing problem. I think we'll ask Bill Baustian if he will give us a brief run down on what the electrical run problems are, besides doubling the system every year.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Direct Observations of the Epitaxial Growth of Sputtered Ag on Si

1973 ◽  
Vol 31 ◽  
pp. 122-123
Author(s):  
J. S. Maa ◽  
Thos. E. Hutchinson
Keyword(s):  
Epitaxial Growth ◽  
Film Growth ◽  
Ion Beam ◽  
Ion Beam Sputtering ◽  
Microscopy Technique ◽  
Direct Observations ◽  
In Situ Electron Microscopy ◽  
Beam Sputtering ◽  
The Subject

The growth of Ag films deposited on various substrate materials such as MoS2, mica, graphite, and MgO has been investigated extensively using the in situ electron microscopy technique. The three stages of film growth, namely, the nucleation, growth of islands followed by liquid-like coalescence have been observed in both the vacuum vapor deposited and ion beam sputtered thin films. The mechanisms of nucleation and growth of silver films formed by ion beam sputtering on the (111) plane of silicon comprise the subject of this paper. A novel mode of epitaxial growth is observed to that seen previously.The experimental arrangement for the present study is the same as previous experiments, and the preparation procedure for obtaining thin silicon substrate is presented in a separate paper.

Effects of Hyperoxia on Lung Utrastructure

1970 ◽  
Vol 28 ◽  
pp. 26-27
Author(s):  
Gladys Harrison
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Light Microscopy ◽  
Oxygen Effects ◽  
Age Dependent ◽  
The Central Nervous System ◽  
The Subject ◽  
Space Age ◽  
Alveolar Septa ◽  
Extensive Damage

With the advent of the space age and the need to determine the requirements for a space cabin atmosphere, oxygen effects came into increased importance, even though these effects have been the subject of continuous research for many years. In fact, Priestly initiated oxygen research when in 1775 he published his results of isolating oxygen and described the effects of breathing it on himself and two mice, the only creatures to have had the “privilege” of breathing this “pure air”.Early studies had demonstrated the central nervous system effects at pressures above one atmosphere. Light microscopy revealed extensive damage to the lungs at one atmosphere. These changes which included perivascular and peribronchial edema, focal hemorrhage, rupture of the alveolar septa, and widespread edema, resulted in death of the animal in less than one week. The severity of the symptoms differed between species and was age dependent, with young animals being more resistant.

Materials for Electron Beam Information Storage

1969 ◽  
Vol 27 ◽  
pp. 152-153 ◽  
Author(s):  
D. E. Speliotis
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Recent Literature ◽  
Electron Beams ◽  
Information Storage ◽  
The Subject ◽  
The Magnetic Field

The interaction of electron beams with a large variety of materials for information storage has been the subject of numerous proposals and studies in the recent literature. The materials range from photographic to thermoplastic and magnetic, and the interactions with the electron beam for writing and reading the information utilize the energy, or the current, or even the magnetic field associated with the electron beam.

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