ANALYSIS OF YACHT PERFORMANCE UNDER THE IOR RULE: THE RELATIONSHIP BETWEEN GEOMETRY AND SPEED POTENTIAL

2021 ◽  
Vol 162 (A4) ◽  
Author(s):  
S W Boyd
Keyword(s):  
Performance Analysis ◽  
Poor Performance ◽  
Geometric Parameters ◽  
Great Length ◽  
Geometric Form ◽  
Prediction Analysis ◽  
Velocity Prediction ◽  
Materials Used ◽  
The Relationship

The International Offshore rule (IOR) provided a handicapping system for racing yacht between 1972 and 1994. During this period great advances in both the materials used in construction and designs specifically to the rule, were made. The popular press discussed, at great length, how loopholes in the rules were exploited to gain a favourable rating. This led to the perception that the exploitation of geometric measurements was leading to boats with poor performance characteristics. This paper aims to address this, firstly through an analysis of the geometric parameters and their evolution through the early part of the IOR era. The paper concludes by undertaking a velocity prediction analysis of a series of boats, a technique that was in its infancy at the time these yachts were designed. The analyses show that the geometric parameters did evolve with time, but not necessarily in line with the understanding behind good performance. Penalties in the rule dictated the direction of design. However, the performance analysis did show that judging yachts based on rated characteristics could lead to misinterpretation, but in general, the performance data aligned reasonably well with assumed performance in specific sailing conditions. The velocity prediction analysis also concluded that the performance of yachts between 1972 and 1981 did increase regardless of the geometric form being dictated by the rules.

Analysis of Yacht Performance Under the IOR Rule: The Relationship Between Geometry and Speed Potential

2020 ◽  
Vol 162 (A4) ◽  
Author(s):  
S W Boyd
Keyword(s):  
Performance Analysis ◽  
Poor Performance ◽  
Geometric Parameters ◽  
Great Length ◽  
Geometric Form ◽  
Prediction Analysis ◽  
Velocity Prediction ◽  
Materials Used ◽  
The Relationship

The International Offshore rule (IOR) provided a handicapping system for racing yacht between 1972 and 1994. During this period great advances in both the materials used in construction and designs specifically to the rule, were made. The popular press discussed, at great length, how loopholes in the rules were exploited to gain a favourable rating. This led to the perception that the exploitation of geometric measurements was leading to boats with poor performance characteristics. This paper aims to address this, firstly through an analysis of the geometric parameters and their evolution through the early part of the IOR era. The paper concludes by undertaking a velocity prediction analysis of a series of boats, a technique that was in its infancy at the time these yachts were designed. The analyses show that the geometric parameters did evolve with time, but not necessarily in line with the understanding behind good performance. Penalties in the rule dictated the direction of design. However, the performance analysis did show that judging yachts based on rated characteristics could lead to misinterpretation, but in general, the performance data aligned reasonably well with assumed performance in specific sailing conditions. The velocity prediction analysis also concluded that the performance of yachts between 1972 and 1981 did increase regardless of the geometric form being dictated by the rules.

scholarly journals Correlation between Defects and Technical Wear of Materials Used in Traditional Construction

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2482
Author(s):  
Jarosław Konior ◽  
Mariusz Rejment
Keyword(s):  
Residential Buildings ◽  
Descriptive Analysis ◽  
Technical Condition ◽  
Water Penetration ◽  
Major Drawback ◽  
Wear Process ◽  
Materials Used ◽  
Traditional Construction ◽  
The Relationship ◽  
Measurable Property

The degree of technical wear of old buildings, which are made of basic materials (cement, concrete, steel, timber, plaster, brick) using traditional technology, is expressed by the size and intensity of damage to their elements. The topic of the research concerns old residential buildings from the turn of the 19th and 20th centuries, which are located in the downtown district of Wroclaw, Poland. The descriptive analysis and the analysis of the definitions of defects that occur in the elements of residential buildings, which were performed as random analyzes, do not allow defects to be considered as measurable variables at a level of visual investigation. The major drawback of the method that is used by experts when assessing the technical condition of civil engineering buildings is that it does not numerically express the magnitude (strength) of the defects. Therefore, an attempt was made to numerically express the relationship (if such a relationship exists) between the occurred defects of buildings and the extent of their technical wear process. When calculating the strength of this relationship, the method of determining the point biserial correlation coefficient for the measurable property and the dichotomous property was used. It was found that the direction of the relation is right-hand for all the tested building elements, but the strength of the correlation between the detected defects and technical wear shows a considerable span and depends on the conditions of the apartment house’s maintenance. As a rule, damage caused by water penetration and moisture penetration always shows correlations of at least moderate strength.

Pots on mats: mat-impressed salt-extraction pottery at Chalcolithic Provadia-Solnitsata, Bulgaria

Antiquity ◽  
2021 ◽  
pp. 1-16
Author(s):  
Mila Andonova ◽  
Vassil Nikolov
Keyword(s):  
Material Culture ◽  
Large Scale ◽  
Raw Materials ◽  
Salt Production ◽  
Production And Consumption ◽  
Late Chalcolithic ◽  
South Eastern Europe ◽  
Materials Used ◽  
The Relationship

Evidence for both basket weaving and salt production is often elusive in the prehistoric archaeological record. An assemblage of Middle–Late Chalcolithic pottery from Provadia-Solnitsata in Bulgaria provides insight into these two different technologies and the relationship between them. The authors analyse sherds from vessels used in large-scale salt production, the bases of which bear the impression of woven mats. This analysis reveals the possible raw materials used in mat weaving at Provadia-Solnitsata and allows interpretation of the role of these mats in salt production at the site. The results illustrate how it is possible to see the ‘invisible’ material culture of prehistoric south-eastern Europe and its importance for production and consumption.

The Date and Circumstances of Olympiodorus of Thebes

Traditio ◽  
1993 ◽  
Vol 48 ◽  
pp. 1-29 ◽  
Author(s):  
Andrew Gillett
Keyword(s):  
Roman Empire ◽  
Late Antiquity ◽  
Fifth Century ◽  
Imperial Court ◽  
Political Narrative ◽  
History Of ◽  
The Rich ◽  
The Relationship ◽  
Western Half

Olympiodorus of Thebes is an important figure for the history of late antiquity. The few details of his life preserved as anecdotes in hisHistorygive glimpses of a career which embraced the skills of poet, philosopher, and diplomat. A native of Egypt, he had influence at the imperial court of Constantinople, among the sophists of Athens, and even outside the borders of the empire. HisHistory(more correctly, his “materials for history”) is lost, surviving only as fragments in the narratives of Zosimus, Sozomen, and Philostorgius, and in the rich summary given by the ninth-century Byzantine patriarch Photius. These remains comprise the most substantial narrative sources for events in the western Roman Empire in the early fifth century. Besides its value as a source, theHistoryis important as a monument to the vitality of the belief in the unity of the Roman Empire under the Theodosian dynasty. Olympiodorus wrote in Greek, and knowledge of his work is attested only in Constantinople, yet his political narrative, from 407 to 425, concerns only events in the western half of the empire. To understand the significance of these facts, it is necessary to set the composition of Olympiodorus's work in its proper context. Clarifying the date of publication is the first step toward this goal. Internal and external evidence suggests that the work was written in 440 or soon after, more than a decade later than the date of composition usually accepted. Taken with thematic emphases evident in the structure of theHistory, this revised dating explains why an eastern writer should have written a detailed account of western events in the early part of the century. Olympiodorus's account is a characteristic product of the highly literate class of eastern imperial civil servants, and of their genuine preoccupation with the relationship between the eastern and western halves of the Roman Empire at a time when both were threatened by the rise of the new Carthaginian power of the Vandals.

scholarly journals How Barbara McClintock discovered transposable elements in maize

2012 ◽  
Vol 10 (4) ◽  
pp. 3-13
Author(s):  
Keyword(s):  
Transposable Elements ◽  
Chromosomal Location ◽  
Chromosome Breakage ◽  
Dna Transposons ◽  
Barbara Mcclintock ◽  
Controlling Elements ◽  
Earthquake Event ◽  
Maize Kernels ◽  
The Relationship

The paper describes the early part of Barbara McClintock`s work on DNA transposons in maize, in which she discovered the Ac-Ds family of mobile "controlling elements". An account is first given of the cytology of the system that was used to generate intact chromosomes having "sticky" (broken) ends. Cytogenetical aspects of the chromatid and chromosome breakage-fusion-bridge cycles, deriving from breakage, are then described, which leads on to the way in which variegation in phenotypes of the maize kernels could be "read" in terms of chromosome breakage. The "genetic earthquake" event of 1944, triggered by introducing broken chromosomes into a zygote from both parents, lead to the discovery of Ds and Ac. Finding mobility of Ds from one chromosomal location to another was pure serendipity: the transposition showed itself while experiments were being undertaken to accurately map Ds. A similar chance observation revealed transposition of Ac as well, and then the relationship between the two elements was elucidated in terms of their autonomous and non-autonomous nature.

scholarly journals Evaluasi Program CSR (Corporate Social Responsibility) Perusahaan PT. ANTAM Tbk UBPN SULTRA Kecamatan Pomalaa Kabupaten Kolaka (Studi Kasus Desa Tambea)

2019 ◽  
Vol 2 (1) ◽  
pp. 51
Author(s):  
Theofilus Salea ◽  
Irfan Ido
Keyword(s):  
Corporate Social Responsibility ◽  
Performance Analysis ◽  
Social Responsibility ◽  
Analytical Method ◽  
Corporate Social ◽  
The Relationship ◽  
A Company

ABSTRACTTPT. ANTAM Tbk is a company engaged in the exploration of mining materials such as nickel, gold and silver, and bauxite. Tambea village is one of the areas in Pomalaa Subdistrict, Kolaka Regency, which is close to PT. ANTAM Tbk. The purpose of this study can evaluate the CSR program of PT. ANTAM Tbk in Tambea Village, Pomalaa District, Kolaka Regency. The method of determining the sample uses the System of Rising Intensification method with a population of 24 heads of households as respondents. The analytical method used to determine the relationship between the level of performance and level of expectation is the method of IPA analysis (Importance-Performance Analysis). The results of this study indicate that the company PT. ANTAM Tbk still has to improve its performance on the elements of program distribution and supporting elements of the program. Keywords: Evaluation, CSR Program and company PT. ANTAM Tbk.

scholarly journals The Campaign of 716–718, from Arabic Sources

1899 ◽  
Vol 19 ◽  
pp. 19-31 ◽  
Author(s):  
E. W. Brooks
Keyword(s):  
Present State ◽  
Asia Minor ◽  
Great Length

In the work known as Khitab Al ‘Uyun, or Book of Springs, pp. 24–33, is contained a long narrative of the disastrous siege of Constantinople by the Arabs in 717–8, which, owing to its great length, I was unable to include in my article on the ‘The Arabs in Asia Minor’ in J.H.S. xviii, p. 182 ff. This work dates from the latter half of the 11th century, and in its present state appears to have been written in Spain, but is clearly drawn from early Eastern sources. Unfortunately the author does not, like most Arabic historians, mention his sources; but from a comparison with the narrative of Al Tabari it is clear that his chief, if not his only, authorities were Al Wakidi and Al Madaini, both of whom wrote in the early part of the 9th century and are earlier in date than any extant Arabic chroniclers.

People and the contemporary environment

2003 ◽  
Author(s):  
Sally Eden
Keyword(s):  
Environmental Management ◽  
Twentieth Century ◽  
Academic Disciplines ◽  
Human Environment ◽  
Late Twentieth ◽  
Catch Up ◽  
Ecological Science ◽  
The Relationship ◽  
Late Twentieth Century

Geographical approaches to human-environment relations have been diverse and dynamic over the last century. They have also been heavily influenced not only by academic disciplines outside geography but by popular and policy concerns outside academia. From an initial flurry of activity about how the environment influences society in the early part of the century, British geography then took a detour to other topics even as other disciplines discovered the environment as a topic of interest. This left geographers playing ‘catch-up’ in the late twentieth century, as the discipline sought to reoccupy the ground previously abandoned. This is not over yet: in the 1990s, research into ‘the environment’ and ‘nature’ was scattered across academia. This chapter examines the relationship between humans and the contemporary environment, focusing on environmental protection, environmental management and ecological science, environmental policy and management, environmentalism, and environment and history.

Military Budget, War Against Boko Haram Insurgency, and Its Impact on Nigerian Politics and Economy

2018 ◽  
pp. 427-447 ◽  
Author(s):  
Moses Metumara Duruji ◽  
Sunday Idowu ◽  
Okachukwu Dibia ◽  
Favour U. Duruji-Moses
Keyword(s):  
Civil Society ◽  
Poor Performance ◽  
Defense Spending ◽  
Boko Haram ◽  
Northeast Region ◽  
Long Duration ◽  
Religious Sect ◽  
The Military ◽  
The Relationship ◽  
Military Budget

This chapter examines the relationship between the components of defense spending, the fight against insurgency in Nigeria, particularly Boko Haram in the Northeast, and its impact on the politics and economics of the country for the period 2009-2017. The long duration of military rule in Nigeria contributed significantly to under-developing the military, a strategy by the military men in power to secure their hold on power. Added to this was the general poor performance of the military administrations in Nigeria that suppressed civil society in the country. Consequently, the widening of political space when the country transited to democracy in 1999 opened up the space for bottled-up agitations that gave rise to ethnic and religious sect militias propagating diverse agendas. One of such is the Boko Haram which waged an insurgency against Nigeria in the northeast region of the country. To tackle the challenge, the budget for the military was increased. The chapter also discusses the military budget as a result of the counter insurgency, its management in the prosecution of the war against Boko Haram, and its impact on the Nigerian economy.

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