FATIGUE ASSESSMENT OF SHIP SUPERSTRUCTURE AT EXPANSION JOINT

2021 ◽  
Vol 155 (A4) ◽  
Author(s):  
S V Petinov ◽  
R V Guchinsky
Keyword(s):  
Stress Distribution ◽  
Block Type ◽  
Expansion Joint ◽  
Fatigue Assessment ◽  
Fatigue Design ◽  
Construction Procedure ◽  
History Of ◽  
Distribution Transformation ◽  
Selection Of

Despite the long history of application of subdivided superstructures and deckhouses, and efforts of ship designers and researchers a sensible solution in design of reliable details at the cut endings was not found yet. It may be explained as consequence of controversial requirements in design of the cut endings. Fatigue design of the superstructure details is addressed to solution of the problem. Presented is an example of fatigue design of the cut ending in a fast ship superstructure based on application of modified «Strain-Life» criterion for fatigue and subsequent approach which utilizes Neuber’s formula and material cyclic properties. To realize the approach a procedure of the long-term stress distribution transformation to the block-type format is developed. Efficiency of the developed technique is illustrated by comparing the results with those of application standard S-N criteria based techniques. The results of analysis allowed selection of the expansion joint detail of the superstructure geometry and construction procedure providing necessary reliability.

Fatigue Assessment of Ship Superstructure at Expansion Joint

2013 ◽  
Vol 155 (A4) ◽  
Keyword(s):  
Stress Distribution ◽  
Block Type ◽  
Expansion Joint ◽  
Fatigue Assessment ◽  
Fatigue Design ◽  
Construction Procedure ◽  
History Of ◽  
Distribution Transformation ◽  
Selection Of

Despite the long history of application of subdivided superstructures and deckhouses, and efforts of ship designers and researchers a sensible solution in design of reliable details at the cut endings was not found yet. It may be explained as consequence of controversial requirements in design of the cut endings. Fatigue design of the superstructure details is addressed to solution of the problem. Presented is an example of fatigue design of the cut ending in a fast ship superstructure based on application of modified «Strain-Life» criterion for fatigue and subsequent approach which utilizes Neuber's formula and material cyclic properties. To realize the approach a procedure of the long-term stress distribution transformation to the block-type format is developed. Efficiency of the developed technique is illustrated by comparing the results with those of application standard S-N criteria based techniques. The results of analysis allowed selection of the expansion joint detail of the superstructure geometry and construction procedure providing necessary reliability.

ACADEMY PROCEEDINGS—PRESIDENT'S PAGE

PEDIATRICS ◽  
1954 ◽  
Vol 14 (1) ◽  
pp. 77-77
Author(s):  
Roger L. J. Kennedy
Keyword(s):  
American Academy ◽  
Rheumatic Fever ◽  
Executive Board ◽  
American Academy Of Pediatrics ◽  
American Medicine ◽  
The Future ◽  
History Of ◽  
Selection Of ◽  
Fellow Member

July 1, 1954, marks a milestone in the history of the American Academy of Pediatrics. For 22 years Doctor Hugh McCulloch has served the Academy, first as co-editor of the Journal of Pediatrics and since the establishment in 1948 of our own publication, Pediatrics, as Editor-in-Chief. Throughout his long term of office he has been an outstanding editor and in addition has found time to serve the Academy in many other ways. He was nominated by the Academy for membership on the American Board of Pediatrics and served as Chairman of the Committee on Rheumatic Fever, to mention only a few of his many activities. Few men have given as much of themselves to pediatrics and American medicine. Since he first served as a member of the Committee on Publication in 1931, Doctor McCulloch has been an inspiration to everyone who has had an opportunity to work with him. His superior qualities of executive ability and imagination have been important factors in establishing Pediatrics as an outstanding publication. Doctor McCulloch has found it necessary to ask to be relieved as Editor-in-Chief because of increasing demands on his time. It was with sincere regret and profound appreciation of Doctor McCulloch's contributions to the American Academy of Pediatrics that the Executive Board acceded to his request. It is impossible to express the magnitude of the debt that the Academy owes Doctor McCulloch for his many years of service. With the selection of Doctor Charles D. May as Editor-in-Chief, the Executive Board presents to its members a fellow member of the Academy who has a broad viewpoint of the responsibilities of the position. He is typical of the new leadership which steadily develops within the Academy and upon which we depend for even greater advances in the future.

scholarly journals The Relevance of Simmel’s Sociology

2020 ◽  
Vol 19 (2) ◽  
pp. 348-367
Author(s):  
Otthein Rammstedt
Keyword(s):  
History Of Sociology ◽  
75Th Anniversary ◽  
Sociological Journal ◽  
History Of ◽  
Important Publication ◽  
German Sociologist ◽  
Classical Sociology ◽  
Selection Of

Otthein Rammstedt was an outstanding sociologist who spent most of his life editing Georg Simmel’s Gesamtausgabe, or collected works. Rammstedt gave much of his strength and energy to get this important publication completed. In 1993, to commemorate the 75th anniversary of Simmel’s death, we put together a selection of his works and the articles written in his honor which was published in 1994 in the second issue of the Sociological Journal. Rammstedt then provided us with his manuscript on Simmel which we are going to republish in the Sociological Education section of our quarterly. His manuscript deserves to be published anew, not just for sad reasons — in the last issue, we announced that Ramstedt passed away after having completed his huge body of work — but also for reasons that are quite substantial. Classical sociology may seem to be a completed project, but it is still a resource that has not been fully exhausted or fully evaluated. The article by Rammstedt, who was experienced not only in the history of sociology but in its theory as well and was the long-term dean of the Faculty of Sociology in Bielefeld University, one of the most renowned sociological institutions in Europe, allows us to see how much we can take from the legacy of the classics. His text has obviously retained its considerable suitability, but, like many classical sociological writings, it needs a new revision or even perhaps a new translation. In any case, we hope this publication will give a new impetus to the study of Simmel’s writings as well as of sociological classics, while at the same time paying a debt of gratitude to the prominent German sociologist, Otthein Rammstedt

A Review of DNVGL-RP-F105 Fatigue Assessment Model or Why My Free Span Has Not Failed

2021 ◽  
Author(s):  
Mário Caruso
Keyword(s):  
Fatigue Life ◽  
Exposure Time ◽  
Vibration Analysis ◽  
Direct Reference ◽  
Assessment Model ◽  
Fatigue Assessment ◽  
Fatigue Design ◽  
Fatigue Model ◽  
Key Aspects

Abstract The objective of a free span fatigue assessment is to provide a rational criterion to evaluate the long-term integrity of a free spanning pipeline, to which DNVGL-RP-F105 was developed. The Recommended Practice has a long history. Guideline 14, the foundation document to it, was released in 1998. The guidelines of the DNVGL-RP-F105 were gradually adopted by the industry for free spans analysis, and even API 1111 makes direct reference to it. Today, DNVGL-RP-F105 is the de facto Vortex Induced Vibration analysis guide for all applications where small number of bending driven modes are expected to be excited, overstepping its original purpose of free spanning pipelines and providing guidance when no other source exists. With such a long history, it is easy to forget the basis for the Recommended Practice fatigue model and obtain results that do not match expectations. A prime example is when assessing a free span based on survey and the fatigue life capacity calculated following the Recommended Practice is much smaller than the actual exposure time. In this situation one may ask “why my free span has not failed?” and conclude that the Recommended Practice is either too over conservative or plainly wrong. This paper reviews some key aspects of the DNVGL-RP-F105 fatigue model and explore their implication to fatigue design and assessment. And it hopes to clarify why your free span has not failed even when you expected it to.

Outcome of the depressed elderly living in the community in Liverpool: a 5-year follow-up

1998 ◽  
Vol 28 (6) ◽  
pp. 1329-1337 ◽  
Author(s):  
V. K. SHARMA ◽  
J. R. M. COPELAND ◽  
M. E. DEWEY ◽  
D. LOWE ◽  
I. DAVIDSON
Keyword(s):  
Elderly Population ◽  
Depressive Disorders ◽  
The Elderly ◽  
Structured Interview ◽  
Depression Score ◽  
History Of ◽  
Elderly Living ◽  
Selection Of

Background. Comparatively little is known about the long-term natural history of depressive disorders in the elderly living in the community. This is a follow-up of a subsample of the Continuing Health in the Community study random sample of the elderly population living in Liverpool.Methods. The investigators followed up 120 cases of depression identified by a semi-structured interview schedule (GMS) for a period of 5 years. A similar number of other subjects defined as subcases of depression, other cases of mental illness and a random selection of non-cases were also included.Results. The 5-year outcome for the cases of depression was worse than the outcome of the non-cases (relative mortality risk of 2·1, 95% confidence interval 1·1 to 3·9). Thirty-four per cent of the cases of depression died and 28% had dropped out during the follow-up. Of the 46 cases of depression who had a complete follow-up, 22% recovered from their symptoms, 30% were found to be AGECAT cases at one of the three follow-up waves, 24% were AGECAT cases at two of the three follow-up waves and the remaining 24% were AGECAT cases at each follow-up wave. Fifteen per cent of the surviving cases of depression were organic cases at the follow-up. Their anxiety co-morbid state and depression score were identified as predictors of poor outcome.Conclusion. The findings of this study indicate that depressive disorders (most of which were untreated) found in the elderly community have a poor prognosis.

scholarly journals Obligations to Objects

Museum Worlds ◽  
2016 ◽  
Vol 4 (1) ◽  
pp. 78-94
Author(s):  
Brit Asmussen ◽  
Lester Michael Hill ◽  
Sean Ulm ◽  
Chantal Knowles
Keyword(s):  
Cultural Heritage ◽  
State Government ◽  
Archaeological Site ◽  
Dam Construction ◽  
Queensland Museum ◽  
Museum Objects ◽  
History Of ◽  
Selection Of

ABSTRACTThis article discusses changing obligations toward objects from an archaeological site held by the Queensland Museum, through a long-term, 40-year case study. Between 1971 and 1972 a selection of 92 stone blocks weighing up to 5 tons containing Aboriginal engravings were cut out of the site and distributed to multiple locations across Queensland by the State Government under the provisions of the then Aboriginal Relics Preservation Act 1967. The site was subsequently flooded following dam construction and the removed blocks became part of the Queensland Museum’s collection. This article chronicles the history of the site and its “salvage,” the consequences of fragmentation of the site for community and institutions, the creation of 92 museum objects, the transformation from immobile to mobile cultural heritage, and community-led requests for their repatriation back to country.

scholarly journals Arte del Sur Andino: la nueva sala del Museo Pedro de Osma

2019 ◽  
pp. 84-95
Author(s):  
Pedro Pablo Alayza
Keyword(s):  
Palabras Clave ◽  
History Of ◽  
Longue Duree ◽  
Longue Durée ◽  
Xix Century ◽  
Selection Of

La nueva sala del Museo Pedro de Osma, Arte del Sur Andino, Tiahuanaco, Inca, Virreinal-Siglos V al XIX, reúne una importante selección de obras precolombinas –perteneciente a la Colección Lambarri de Cusco– de estas culturas surandinas, además de obras virreinales. El objetivo de este nuevo espacio museográfico es confrontar estos universos culturales, a fin de mostrar al visitante de qué modo el arte virreinal cusqueño se sustentó en las creencias prehispánicas y cómo algunos elementos materiales de la cultura –el quero y el tupu– han seguido en uso bajo los mismos patrones ceremoniales desde el siglo V y durante el virreinato hasta fechas recientes. Se aplica así el concepto de la longue durée (la larga duración), que plantea la necesidad de enmarcar la historia de un territorio en procesos amplios, en lugar de considerar solamente la sucesión de acontecimientos. Palabras clave: museografía, arqueología, colecciones, museos, sur andino.   AbstractThe new hall at the Museo Pedro de Osma (Pedro de Osma Museum), Art of the Southern Andean, Tiahuanaco, Inca, Viceroyalty – From the V to the XIX century, gathers an important selection of pre-Columbian works – belonging to the Lambarri Collection of Cusco - of these South Andean cultures, besides viceroyalty works. The objective of this new museographical space is to confront these cultural universes to show the visitor how Cuzco viceroyalty art was based on pre-Hispanic beliefs, and how some material elements of the culture -the quero and the tupu- have continued being used under the same ceremonial patterns, from the 5th century and during the viceroyalty until recent dates. The concept of the longue durée (long term) is thus applied, which raises the need to frame the history of a territory in broad processes, instead of considering only the succession of events.  Keywords: Museography, Archeology, Collections, Museums, South Andean.

scholarly journals Průzkum sbírky fonografických válečků Českého muzea hudby

2021 ◽  
Vol 57 (2) ◽  
pp. 59-70
Author(s):  
Barbora Mašek Benetková ◽  
Martin Mejzr ◽  
Radka Šefců ◽  
Filip Šír
Keyword(s):  
Degradation Products ◽  
Wide Spectrum ◽  
National Museum ◽  
Long Term Storage ◽  
History Of ◽  
Representative Selection ◽  
Term Storage ◽  
Selection Of

The paper presents the interdisciplinary survey of the phonographic cylinders collection of National Museum – Czech Museum of Music. The text was created for the New Phonograph: Listening to the History of Sound project. The paper focuses on the characterisation of long-term storage of the collection and a common form of degradation – a fair overlay on the cylinder‘s surface. As for dealing with the wide spectrum of samples in the collection, the survey is focused on the most commonly occurring phonographic cylinders and their enclosures. A representative selection of samples was analysed to clarify the character of the degradation products and its origin.

Strain-Life Approach: Application for Fatigue Design of Ship Superstructure Critical Detail

2014 ◽  
Vol 617 ◽  
pp. 197-202 ◽  
Author(s):  
Sergei Petinov
Keyword(s):  
Empirical Relationship ◽  
Local Stress ◽  
Local Strain ◽  
Ship Hull ◽  
Fatigue Properties ◽  
Block Type ◽  
Service Reliability ◽  
Expansion Joint ◽  
Fatigue Design ◽  
Critical Detail

Strain-Life approach to fatigue analysis of structures being developed since early 1960s recently was considered applicable in Civil Engineering, in particular, for fatigue evaluation of bridge structure with integrated abutments. To exemplify the approach and display the problems of its implementation in fatigue design, in-service reliability of structures, an example of fatigue design of a ship superstructure critical detail is presented. The detail is located at expansion joint ending in the superstructure which is frequently applied in ship design aimed at reducing stresses in a long superstructure caused by the general bending deformation of ship hull. Specific of the detail is the high local stress concentration which may result in fatigue damage menacing integrity of the ship hull. In the example of fatigue design of the expansion joint the modified «Strain-Life» criterion for fatigue of material is applied along with empirical relationship providing evaluation of the local strain. This version of the approach allows assessment of fatigue properties of the detail without utilizing Neuber’s formula and presenting the loading history in the block-type format. The results of analysis allowed selection of the expansion joint detail of the superstructure geometry and construction procedure at a shipyard providing necessary reliability.

scholarly journals Reconstructing solar magnetic fields from historical observations

2019 ◽  
Vol 628 ◽  
pp. A103 ◽  
Author(s):  
Alexei A. Pevtsov ◽  
Kseniya A. Tlatova ◽  
Alexander A. Pevtsov ◽  
Elina Heikkinen ◽  
Ilpo Virtanen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Solar Magnetic Field ◽  
Field Measurements ◽  
Solar Magnetic Fields ◽  
Mount Wilson Observatory ◽  
Magnetic Field Measurements ◽  
History Of ◽  
Selection Of

Context. Systematic observations of magnetic field strength and polarity in sunspots began at Mount Wilson Observatory (MWO), USA in early 1917. Except for a few brief interruptions, this historical dataset has continued until the present. Aims. Sunspot field strength and polarity observations are critical in our project of reconstructing the solar magnetic field over the last hundred years. We provide a detailed description of the newly digitized dataset of drawings of sunspot magnetic field observations. Methods. The digitization of MWO drawings is based on a software package that we developed. It includes a semiautomatic selection of solar limbs and other features of the drawing, and a manual entry of the time of observations, measured field strength, and other notes handwritten on each drawing. The data are preserved in an MySQL database. Results. We provide a brief history of the project and describe the results from digitizing this historical dataset. We also provide a summary of the final dataset and describe its known limitations. Finally, we compare the sunspot magnetic field measurements with those from other instruments, and demonstrate that, if needed, the dataset could be continued using modern observations such as, for example, the Vector Stokes Magnetograph on the Synoptic Optical Long-term Investigations of the Sun platform.

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