The Ceiling of the Church of St Ignatius and the Perception of Concave Surfaces

Perception ◽  
1991 ◽  
Vol 20 (6) ◽  
pp. 771-787 ◽  
Author(s):  
Manfredo Massironi ◽  
Ugo Savardi
Keyword(s):  
Seventeenth Century ◽  
Quantitative Evaluation ◽  
Experimental Studies ◽  
Cross Ratio ◽  
Projective Invariant ◽  
Ecological Theories ◽  
The Cross ◽  
The Church

This research describes two hitherto unobserved phenomena in the frescoes of the seventeenth century architect and painter, Andrea Pozzo, painted on the vaulted ceiling of the central nave of the Church of St Ignatius in Rome. The present research also reports the results of two experimental studies on the problem of the perception of shapes projected on concave surfaces. A quantitative evaluation of the phenomena perceived from various points of observation is made by means of stimuli projected at various angles on a semicylindrical surface. The validity of the assumption of invariance, and in particular of the projective invariant called the cross-ratio, is discussed within the framework of ecological theories on perception.

scholarly journals The iconostasis in Decani: the original painted programme and subsequent changes

Zograf ◽  
2012 ◽  
pp. 115-129
Author(s):  
Branislav Todic
Keyword(s):  
Seventeenth Century ◽  
Sixteenth Century ◽  
Fourteenth Century ◽  
Wall Painting ◽  
John The Baptist ◽  
History Of ◽  
The Cross ◽  
The Church ◽  
Eighth Decade

The history of the iconostasis in the central nave of the church in Decani can be divided into two periods. The icons of Christ, the Mother of God, John the Baptist and St. Nicholas on the original altar screen, painted around 1343, were related to the relics of King Stefan Decanski and with the wall painting in the church space in front of the altar. The removal of those icons at the end of the sixteenth century and their replacement with new ones explains the strengthening cult of St. Stefan Decanski. In 1577 an icon of St. Stephen was placed over the king?s portrait depicted in the fourteenth century fresco painting, and by 1593/1594, the new despotic icons of Christ and the Virgin were painted for the iconostasis, then an expanded Deesis that was placed above them, with a large cross fixed on the top. The central icons were painted by the painter Longin, and the cross is attributed to Andreja, a painter known for his frescoes from the seventh and eighth decade of the seventeenth century.

Experimental Studies Of Multilayer Glass Structures On Compression, Compression With Bending And Simple Bending

2019 ◽  
pp. 22-30
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Applied Load ◽  
Experimental Studies ◽  
Strength Properties ◽  
Research Topic ◽  
Normative Values ◽  
Laminated Glass ◽  
The Cross ◽  
Experimental Values

The work of multilayer glass structures for central and eccentric compression and bending are considered. The substantiation of the chosen research topic is made. The description and features of laminated glass for the structures investigated, their characteristics are presented. The analysis of the results obtained when testing for compression, compression with bending, simple bending of models of columns, beams, samples of laminated glass was made. Overview of the types and nature of destruction of the models are presented, diagrams of material operation are constructed, average values of the resistance of the cross-sections of samples are obtained, the table of destructive loads is generated. The need for development of a set of rules and guidelines for the design of glass structures, including laminated glass, for bearing elements, as well as standards for testing, rules for assessing the strength, stiffness, crack resistance and methods for determining the strength of control samples is emphasized. It is established that the strength properties of glass depend on the type of applied load and vary widely, and significantly lower than the corresponding normative values of the strength of heat-strengthened glass. The effect of the connecting polymeric material and manufacturing technology of laminated glass on the strength of the structure is also shown. The experimental values of the elastic modulus are different in different directions of the cross section and in the direction perpendicular to the glass layers are two times less than along the glass layers.

Dreams Give Birth to Reality”. Engraving Austroseraphicum Coelum as an Attempt to Create a New Reality by the Spanish Habsburgs Dynastic Propaganda / Sny rodzą rzeczywistość…”. Grafika Austroseraphicum Coelum jako próba kreowania nowej rzeczywistości za pomocą propagandy dynastycznej Habsburgów hiszpańskich

2014 ◽  
Vol 39 (1) ◽  
Author(s):  
Jan Kurowiak
Keyword(s):  
Seventeenth Century ◽  
The Netherlands ◽  
General Condition ◽  
Symbolic System ◽  
Political Situation ◽  
Mission Of God ◽  
Starting Point ◽  
The World ◽  
The Church

AbstractAs a work of propaganda, graphics Austroseraphicum Coelum Paulus Pontius should create a new reality, make appearances. The main impression while seeing the graphics is the admiration for the power of Habsburgs, which interacts with the power of the Mother of God. She, in turn, refers the viewer to God, as well as Franciscans placed on the graphic, they become a symbol of the Church. This is a starting point for further interpretation of the drawing. By the presence of certain characters, allegories, symbols, we can see references to a particular political situation in the Netherlands - the war with the northern provinces of Spain. The message of the graphic is: the Spanish Habsburgs, commissioned by the mission of God, they are able to fight all of the enemies, especially Protestants, with the help of Immaculate and the Franciscans. The main aim of the graphic is to convince the viewer that this will happen and to create in his mind a vision of the new reality. But Spain was in the seventeenth century nothing but a shadow of former itself (in the time of Philip IV the general condition of Spain get worse). That was the reason why they wanted to hold the belief that the empire continues unwavering. The form of this work (graphics), also allowed to export them around the world, and the ambiguity of the symbolic system, its contents relate to different contexts, and as a result, the Habsburgs, not only Spanish, they could promote their strength everywhere. Therefore it was used very well as a single work of propaganda, as well as a part of a broader campaign

Hymnody and Liturgy

2019 ◽  
pp. 491-506
Author(s):  
Jonathan Hehn
Keyword(s):  
Nineteenth Century ◽  
Seventeenth Century ◽  
Sixteenth Century ◽  
North American ◽  
John Calvin ◽  
Church Of Scotland ◽  
Metrical Psalmody ◽  
History Of ◽  
The Church

This chapter outlines the history of Presbyterian worship practice from the sixteenth century to the present, with a focus on North American Presbyterians. Tracing both their hymnody and their liturgy ultimately to John Calvin, Presbyterian communions have a distinct heritage of worship inherited from the Church of Scotland via seventeenth-century Puritans. Long marked by metrical psalmody and guided by the Westminster Directory, Presbyterian worship underwent substantial changes in the nineteenth century. Evangelical and liturgical movements led Presbyterians away from a Puritan visual aesthetic, into the use of nonscriptural hymnody, and toward a recovery of liturgical books. Mainline North American and Scottish Presbyterians solidified these trends in the twentieth and twenty-first centuries; however, conservative North American denominations and some other denominations globally continue to rely heavily on the use of a worship directory and metrical psalmody.

scholarly journals Cross-Predicting Essential Genes between Two Model Eukaryotic Species Using Machine Learning

2021 ◽  
Vol 22 (10) ◽  
pp. 5056
Author(s):  
Tulio L. Campos ◽  
Pasi K. Korhonen ◽  
Neil D. Young
Keyword(s):  
Machine Learning ◽  
Experimental Studies ◽  
Essential Genes ◽  
Subcellular Localisation ◽  
Cross Prediction ◽  
Gene Essentiality ◽  
C Elegans ◽  
Cellular Processes ◽  
Eukaryotic Species ◽  
The Cross

Experimental studies of Caenorhabditis elegans and Drosophila melanogaster have contributed substantially to our understanding of molecular and cellular processes in metazoans at large. Since the publication of their genomes, functional genomic investigations have identified genes that are essential or non-essential for survival in each species. Recently, a range of features linked to gene essentiality have been inferred using a machine learning (ML)-based approach, allowing essentiality predictions within a species. Nevertheless, predictions between species are still elusive. Here, we undertake a comprehensive study using ML to discover and validate features of essential genes common to both C. elegans and D. melanogaster. We demonstrate that the cross-species prediction of gene essentiality is possible using a subset of features linked to nucleotide/protein sequences, protein orthology and subcellular localisation, single-cell RNA-seq, and histone methylation markers. Complementary analyses showed that essential genes are enriched for transcription and translation functions and are preferentially located away from heterochromatin regions of C. elegans and D. melanogaster chromosomes. The present work should enable the cross-prediction of essential genes between model and non-model metazoans.

Suggested Notation for Ratios and Cross-Ratios

1912 ◽  
Vol 6 (98) ◽  
pp. 294-296
Author(s):  
Alfred Lodge
Keyword(s):  
Cross Ratio ◽  
The Cross

I wish to call attention to the value, for some purposes, ot the notation for the ratio ; and for the cross-ratio . For instance: in Menelaus’ theorem for the property of a transversal meeting the sides of a triangle ABC in the points P, Q, R, the first mentioned notation makes the property shine out very clearly The equation in the form is , which conspicuously separates the points on the transversal from the angular points of the triangle.

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