A Brief History of the Yield Stress

1999 ◽  
Vol 9 (6) ◽  
pp. 262-266 ◽  
Author(s):  
Howard A. Barnes
Keyword(s):  
Yield Stress ◽  
Physical Entity ◽  
Limited Data ◽  
Flow Conditions ◽  
Short Article ◽  
Original Measurement ◽  
History Of ◽  
Abbreviated Description ◽  
New Generation ◽  
Stress Flow

Abstract This short article is a summary of a recently published, lengthy review [1] in which the author challenges the often-accepted view that materials have yield stresses, below which no flow takes place. However, following the introduction of the new generation of controlled-stress rheometers it is shown that when careful measurements are made below the supposed ’yield stress‘, flow does actually take place. The argument for the nonexistence of the yield stress as a physical entity now seems insuperable. However, in spite of this, it is nevertheless accepted that an apparent yield stress is a useful mathematical abbreviated description of limited data over a given range of flow conditions. This yield stress parameter can be used effectively for predicting flow, but only within the region of the original measurement that furnished the yield stress.

scholarly journals Low Nucleotide Diversity in Chimpanzees and Bonobos

Genetics ◽  
2003 ◽  
Vol 164 (4) ◽  
pp. 1511-1518 ◽  
Author(s):  
Ning Yu ◽  
Michael I Jensen-Seaman ◽  
Leona Chemnick ◽  
Judith R Kidd ◽  
Amos S Deinard ◽  
...  
Keyword(s):  
Nucleotide Diversity ◽  
Nuclear Dna ◽  
Demographic History ◽  
Nuclear Genome ◽  
Limited Data ◽  
Effective Population ◽  
East Central ◽  
Dna Diversity ◽  
History Of ◽  
Mtdna Diversity

Abstract Comparison of the levels of nucleotide diversity in humans and apes may provide much insight into the mechanisms of maintenance of DNA polymorphism and the demographic history of these organisms. In the past, abundant mitochondrial DNA (mtDNA) polymorphism data indicated that nucleotide diversity (π) is more than threefold higher in chimpanzees than in humans. Furthermore, it has recently been claimed, on the basis of limited data, that this is also true for nuclear DNA. In this study we sequenced 50 noncoding, nonrepetitive DNA segments randomly chosen from the nuclear genome in 9 bonobos and 17 chimpanzees. Surprisingly, the π value for bonobos is only 0.078%, even somewhat lower than that (0.088%) for humans for the same 50 segments. The π values are 0.092, 0.130, and 0.082% for East, Central, and West African chimpanzees, respectively, and 0.132% for all chimpanzees. These values are similar to or at most only 1.5 times higher than that for humans. The much larger difference in mtDNA diversity than in nuclear DNA diversity between humans and chimpanzees is puzzling. We speculate that it is due mainly to a reduction in effective population size (Ne) in the human lineage after the human-chimpanzee divergence, because a reduction in Ne has a stronger effect on mtDNA diversity than on nuclear DNA diversity.

scholarly journals Music, Politics, and History: An Introduction

2021 ◽  
Vol 60 (2) ◽  
pp. 362-374
Author(s):  
David Kennerley
Keyword(s):  
Sound Studies ◽  
The Body ◽  
Future Research ◽  
Short Article ◽  
Distinctive Features ◽  
Music And Politics ◽  
Introductory Article ◽  
History Of ◽  
Eighteenth And Nineteenth Centuries ◽  
The Relationship

AbstractMusic has been steadily rising up the historical agenda, a product of the emergence of sound studies, the history of the senses, and a mood of interdisciplinary curiosity. This introductory article offers a critical review of how the relationship between music and politics has featured in extant historical writing, from classic works of political history to the most recent scholarship. It begins by evaluating different approaches that historians have taken to music, summarizes the important shifts in method that have recently taken place, and advocates for a performance-centered, contextualized framework that is attentive to the distinctive features of music as a medium. The second half examines avenues for future research into the historical connections between music and politics, focusing on four thematic areas—the body, emotions, space, and memory—and closes with some overarching reflections on music's use as a tool of power, as well as a challenge to it. Although for reasons of cohesion, this short article focuses primarily on scholarship on Britain and Ireland in the eighteenth and nineteenth centuries, its discussion of theory and methods is intended to be applicable to the study of music and political culture across a broad range of periods and geographies.

Estimating time to onset of swine influenza symptoms after initial novel A(H1N1v) viral infection

2010 ◽  
Vol 139 (9) ◽  
pp. 1418-1424 ◽  
Author(s):  
B. D. M. TOM ◽  
A. J. VAN HOEK ◽  
R. PEBODY ◽  
J. McMENAMIN ◽  
C. ROBERTSON ◽  
...  
Keyword(s):  
Incubation Time ◽  
Time Distribution ◽  
Age Groups ◽  
Swine Influenza ◽  
Interval Censoring ◽  
Limited Data ◽  
History Of ◽  
Influenza Case ◽  
Time To Onset

SUMMARYCharacterization of the incubation time from infection to onset is important for understanding the natural history of infectious diseases. Attempts to estimate the incubation time distribution for novel A(H1N1v) have been, up to now, based on limited data or peculiar samples. We characterized this distribution for a generic group of symptomatic cases using laboratory-confirmed swine influenza case-information. Estimates of the incubation distribution for the pandemic influenza were derived through parametric time-to-event analyses of data on onset of symptoms and exposure dates, accounting for interval censoring. We estimated a mean of about 1·6–1·7 days with a standard deviation of 2 days for the incubation time distribution in those who became symptomatic after infection with the A(H1N1v) virus strain. Separate analyses for the <15 years and ⩾15 years age groups showed a significant (P<0·02) difference with a longer mean incubation time in the older age group.

Across and Down

1939 ◽  
Vol 8 (24) ◽  
pp. 129-138 ◽  
Author(s):  
R. P. Austin
Keyword(s):  
Lord Byron ◽  
The United States ◽  
Short Article ◽  
Crossword Puzzle ◽  
Casual Reader ◽  
History Of ◽  
Oxford Dictionary ◽  
Popular Work ◽  
Good Standard ◽  
Literary Phenomenon

The casual reader, on seeing these lines, might be forgiven for the thought that Lord Byron had the crossword puzzle in mind when he wrote them. In an uncertain world nothing is more certain than that this was not the case. Byron died in 1824. The crossword puzzle was born, at least in its popular modern shape, almost precisely a century later. Its history begins suddenly. Neither in the Concise Oxford Dictionary of 1921, nor in the twelfth edition of Encyclopaedia Britannica, dated 1922, does the crossword appear at all. But from the year 1923 references to it become increasingly frequent. In 1924 a popular work entitled The Crossword Puzzle Book was published. In 1925 there was a reference to crosswords in Punch. In 1926 the thirteenth edition of Encyclopaedia Britannica had a short article on it. In 1928 the crossword puzzle was mentioned in Galsworthy's Swan Song. From that time every good standard dictionary or work of reference has included it. These facts document its emergence as a literary phenomenon in Great Britain. The history of the crossword in the United States is very similar, except that it would appear to have achieved stardom in the popular firmament a few months earlier in that country than in this.

A New Approach to the Modeling of Magnetorheological Dampers and Application to Resonance Control

2021 ◽  
Author(s):  
Dennis A. Siginer ◽  
Mario Letelier ◽  
Juan Sebastián Stockle Henríquez
Keyword(s):  
Flow Pattern ◽  
Yield Stress ◽  
A Priori ◽  
Time History ◽  
Magnetorheological Damper ◽  
Mr Fluid ◽  
Variable Resistance ◽  
History Of ◽  
Displacement Pattern ◽  
Analytical Tools

Abstract A predetermined flow pattern in a magnetorheological damper providing continuously variable resistance to flow is required for efficient damping of a given load. The required predetermined flow pattern rests on the a priori determination of the constitutive properties of the magnetorheological (MR) fluid determined to generate variable resistance to flow. The inverse problem of constructing the predetermined response of the damper with a specific displacement pattern of the piston in the damper for efficient damping of a given load is solved. The magnetorheological (MR) fluid in the damper is modeled as a Bingham phase change material with time dependent yield stress offering continuously variable resistance to the flow in the piston to achieve the required specific displacement pattern. The governing equations are solved for any time history of the dimensionless yield stress of the fluid which in turn is determined from the imposed response of the damper. Analytical tools developed can be used in optimizing damper performance. The application of the method to resonance mitigation is illustrated.

Epidemics and History: Multiple Approaches to the Subject

2021 ◽  
pp. 5
Author(s):  
Dmitriy Mikhel
Keyword(s):  
20Th Century ◽  
Great Influence ◽  
Medical Knowledge ◽  
Public Attention ◽  
Medical Texts ◽  
Quarter Century ◽  
History Of ◽  
The Media ◽  
New Generation ◽  
The 19Th Century

The problems of epidemics have increasingly attracted the attention of researchers in recent years. The history of epidemics has its own historiography, which dates to the physician Hippocrates and the historian Thucydides. Up to the 19th century, historians followed their ideas, but due to the progress in medical knowledge that began at that time, they almost lost interest in the problems of epidemics. In the early 20th century, due to the development of microbiology and epidemiology, a new form of the historiography of epidemics emerged: the natural history of diseases which was developed by microbiologists. At the same time, medical history was reborn, and its representatives saw their task as proving to physicians the usefulness of studying ancient medical texts. Among the representatives of the new generation of medical historians, authors who contributed to the development of the historiography of epidemics eventually emerged. By the end of the 20th century, they included many physician-enthusiasts. Since the 1970s, influenced by many factors, more and more professional historians, for whom the history of epidemics is an integral part of the history of society. The last quarter-century has also seen rapid growth in popular historiography of epidemics, made possible by the activation of various humanities researchers and journalists trying to make the history of epidemics more lively and emotional. A great influence on the spread of new approaches to the study of the history of epidemics is now being exerted by the media, focusing public attention on the new threats to human civilization in the form of modern epidemics.

Comparison Of Drugs in Patients Using New Generation Anticoagulants

2021 ◽  
Vol 6 (14) ◽  
pp. 56-67
Author(s):  
Arslan Say ◽  
Abdülkadir ÇAKMAK ◽  
Gökhan KESKİN ◽  
Erdinç PELİT ◽  
Yılmaz ÖZBAY
Keyword(s):  
Atrial Fibrillation ◽  
Clinical Practice ◽  
Venous Thromboembolism ◽  
Oral Anticoagulants ◽  
Recurrent Venous Thromboembolism ◽  
Anticoagulant Drugs ◽  
History Of ◽  
The Mean ◽  
N 93 ◽  
New Generation

Aim: New generation anticoagulants rapidly find a wider area of use in the clinic due to the use problems of other oral anticoagulants. Anticoagulants such as Dabigatran, Rivaroxaban, and Apixaban with safer treatment intervals have been accepted in clinical practice guidelines and have taken their place as preferred drugs. In this study, we aimed to retrospectively examine the effects of three new-generation anticoagulant drugs on a group of patients. Material and Methods: In this retrospectively planned study, patients diagnosed with atrial fibrillation (n = 522) were divided into three groups according to the drugs used for treatment (Dabigatran, Rivaroxaban, and Apixaban). Routine blood values of the patients in each group were retrospectively scanned according to age, gender, time of drug initiation and presence of chronic disease. Results: According to the results obtained, it was found that the mean HCT, BUN, AST, ALT, MPV, Iron, and Ferritin were higher in patients using Apixaban than those using Dabigatran and Rivaroxaban drugs, but the age, average values of Hgb1 Hgb2, Hgb1, PLT, CrCl, Gfr and INR of the patients using Apixaban lower than those using Dabigatran and Rivaroxaban. The highest rate (22.5%) was found in the group of patients taking apixaban (n=93) when people taking the drugs were examined in terms of mortality. Conclusion: It has been observed that Rivaroxaban can be used more safely in patients with a history of acute cancer and thrombosis, patients with recurrent venous thromboembolism, and patients with high frailty, three drugs should be preferred instead of oral anticoagulants.

New Types of Cooperative Research in Japan

1998 ◽  
Vol 12 (4) ◽  
pp. 235-242
Author(s):  
Manabu Eto
Keyword(s):  
Technological Progress ◽  
User Interaction ◽  
Research System ◽  
Research Projects ◽  
Cooperative Research ◽  
Joint Research ◽  
Economic Progress ◽  
Research Systems ◽  
History Of ◽  
New Generation

Japan has a long history of systematically organizing and carrying out joint research projects between industrial, government and academic institutions. Even competing industries have cooperated in these research projects, and such cooperation has greatly helped Japan's economic progress. The country's technological progress has equalled in some areas and surpassed in others that of countries in the West, and, with the continued advancement of big business, Japan has arrived at a stage at which it can continue its technological progress on its own. This is causing great changes in the meaning and impact of cooperative research endeavours. In this paper the author discusses the problems and possible solutions involved in developing the current cooperative research systems into efficient systems which meet the needs of this new generation of research. He also outlines the potential influence of these changes on the procedures and policies in the current research system, and on user interaction and the results achieved. The paper also constructs a model of a cooperative research system which can meet the country's current requirements.

Herbal Supplement PC-Spes for Prostate Cancer

2002 ◽  
Vol 36 (5) ◽  
pp. 921-926 ◽  
Author(s):  
Mário L de Lemos
Keyword(s):  
Prostate Cancer ◽  
Cancer Patients ◽  
Estrogenic Activity ◽  
Estrogen Therapy ◽  
Herbal Supplement ◽  
Limited Data ◽  
History Of ◽  
Abnormal Bleeding ◽  
Androgen Suppression ◽  
American Society

OBJECTIVE: To determine the efficacy and toxicity of the herbal supplement PC-Spes in prostate cancer patients. METHODS: Literature search through MEDLINE (1966–October 2001), PubMed, and abstracts from the Annual Meeting of the American Society of Clinical Oncology (1995–2001). RESULTS: PC-Spes was associated with biochemical and clinical response in some prostate cancer patients. The mechanisms of action of PC-Spes appeared to be related to its estrogenic activity. CONCLUSIONS: PC-Spes is associated with some efficacy in prostate cancer patients. Due to the limited data available, it should not be used to replace standard androgen suppression therapy in androgen-dependent patients. PC-Spes may have a role for patients who have failed standard treatments for androgen-independent disease and have no history of thromboembolism or abnormal bleeding. PC-Spes has a toxicity profile similar to those of androgen suppression and estrogen therapy.

scholarly journals Toward a General Theory and Global History of Workers’ Education

2016 ◽  
Vol 90 ◽  
pp. 5-11 ◽  
Author(s):  
Michael Merrill ◽  
Susan J. Schurman
Keyword(s):  
General Theory ◽  
Social Movement ◽  
Labor Movement ◽  
Democratic Education ◽  
Labor Movements ◽  
Global History ◽  
History Of ◽  
Contested Terrain ◽  
New Generation

AbstractWorkers’ education, understood to mean the education of workers by workers for purposes they themselves determine, has always been highly contested terrain, just like work itself. If there is to be an adequate global history of workers’ education, it will need to be guided by a suitable general theory. Hegel most expansively and Durkheim most persuasively argued that societies are cognitive and moral projects, of which education is constitutive: knowing and social being are inextricably bound up with one another. In the global democratic revolutions of the last 250 years, the labor movement distinguished itself as simultaneously a social movement, an education in democracy, and a struggle for a democratic education. The history of workers’ education is a history of workers striving to remake their communities into democracies and themselves into democrats. This brief essay introduces a collection of essays representative of a new generation of scholarship on the history of workers’ education, which we hope will help both traditional and emerging labor movements understand their past and think more clearly about their future.

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