Aeromechanics of Long Jumps in Spider Crickets: Insights From Experiments and Modeling

2017 ◽  
Author(s):  
Emily H. Palmer ◽  
Nicolas Deshler ◽  
Rajat Mittal
Keyword(s):  
Phenomenological Models ◽  
High Speed ◽  
Body Posture ◽  
The Past ◽  
Aerial Portion ◽  
Jump Distance ◽  
The Family ◽  
Engineering Designs ◽  
The Subject ◽  
Drag Laws

Flapping, gliding, running, crawling, and swimming in animals have all been studied extensively in the past and have served as sources of inspiration for engineering designs. In this paper, we describe the aeromechanics of a mode of locomotion that straddles ground and air: jumping. The subject of our study is the spider cricket of the family Rhaphidophoridae, an animal that is among the most proficient of long-jumpers in nature. The focus of the study is to understand the aeromechanics of the aerial portion of the jump of this animal. The research employs high-speed videogrammetry to track the crickets’ posture and appendage orientation throughout their jumps. Experiments demonstrate that these insects employ carefully controlled and coordinated positioning of their limbs during their jumps so as to increase jump distance and stabilize body posture. Simple phenomenological models based on drag laws indicate that the conformation of the limbs during the latter portion of the jump is stable to pitch and enables these animals to land in a controllable manner. Insights from this study could be useful in the design of micro-robots that exploit jumping as a means of locomotion.

Reflections on Feminism and Monism in the Kaiserreich, 1900–1913

2001 ◽  
Vol 34 (2) ◽  
pp. 191-230 ◽  
Author(s):  
Edward Ross Dickinson
Keyword(s):  
National Socialism ◽  
Population Policy ◽  
Women's Movements ◽  
World War ◽  
The Past ◽  
Christian Churches ◽  
The First World War ◽  
The Family ◽  
The Subject ◽  
First World

The League for the Protection of Motherhood (Bund für Mutterschutz und Sexualreform, or BfM) was the largest and most active sex-reform organization in Germany before the First World War. The league was at the center of a broad debate about sexuality, gender roles, the family, and population policy, in which representatives not only of the women's movements but also of the Christian churches, the medical and psychiatric establishments, and the sexology, eugenics, and life-reform (particularly nudist) movements participated. Both this broader debate and the BfM itself have been the subject of intensive study over the past fifteen years. One major interpretive focus of the literature to date has been on the issue of the extent to which the biologistic, social Darwinist, and eugenic ideas prominent in the thinking of many of the leading figures in the BfM were or were not evidence of a turning away from liberal, individualist feminism and toward the political and social Right, or of deeper intellectual affinities between National Socialism and sex reform — a point regarding which there is still considerable disagreement.

Two Lives of Mpamizo: Understanding Dissonance in Oral History

1996 ◽  
Vol 23 ◽  
pp. 319-332 ◽  
Author(s):  
Justin Willis
Keyword(s):  
Colonial Period ◽  
The Past ◽  
The Social ◽  
The Family ◽  
Paternal Grandfather ◽  
History Of ◽  
The Subject ◽  
Southwestern Uganda ◽  
First Interview ◽  
Important Shift

In August 1993 and February 1994 I conducted two interviews with a woman in Buhweju, a county in southwestern Uganda. The interviews were part of a series concerning the social and political history of Buhweju, which is now part of Bushenyi District. In the precolonial period, Buhweju was a small autonomous polity ruled by an hereditary “king;” in the colonial period it was subsumed into the neighboring kingdom of Nkore, which became known as Ankole.The first interview, like most of my interviews, focused on the history of the family of the interviewee, and she said that her paternal grandfather, whose name was Mpamizo, had been a Hima, or pastoralist. In Buhweju, and elsewhere in Ankole, this meant, and still means, very much more than simply being a keeper of cattle. The agriculturalist Iru and pastoralist Hima share the same language and much of the same culture, but speak and behave differently in a number of significant ways (diet and mode of subsistence being prominent among these), so that whether one is a pastoralist or an agriculturalist is very apparent to any other member of society. The woman to whom I was talking is very evidently an Iru, an agriculturalist, in her manner and in the way she lives, as is her husband, and so I was surprised to hear that her grandfather was a Hima, a pastoralist. It was partly for this reason that I went back to talk to her again: but on the second occasion, there was an important shift in her presentation of Mpamizo—a dissonance in her account of the past. Mpamizo, she now said, was an Iru. This dissonance is the subject of this paper, for it holds important lessons both about society in Buhweju and about the ways in which we interpret oral accounts of the past.

scholarly journals „Linie ucieczki ciągnie się za sobą przez całe życie”

Politeja ◽  
2021 ◽  
Vol 18 (1(70)) ◽  
pp. 111-124
Author(s):  
Katarzyna Śliwińska
Keyword(s):  
Old Age ◽  
German Literature ◽  
Memory Studies ◽  
Progressive Dementia ◽  
Popular Discourse ◽  
The Past ◽  
The Family ◽  
Ageing Processes ◽  
Contemporary German Literature ◽  
The Subject

“Lines of flight are dragged behind you all your life.” Post-Memory, Old Age, and Forgetting in Ulrike Draesner’s Novel Sieben Sprünge vom Rand der Welt (2014) In contemporary German literature, particularly in the family novels that are key to the post-memory discourse of the past, there is a marked interest in the dysfunctions and deformations of memory associated with ageing processes. Demographic changes lead researchers to consider the determinants and the existing dominant themes and categories of interdisciplinary memory studies. Ulrike Draesner’s 2014 novel, Sieben Sprünge vom Rand der Welt, the subject of this paper, probes the meanders of memory and forgetting, examining their configurations in intergenerational relations. I am interested here in the threads that have been marginalized in the popular discourse on the flight and resettlement of millions of Germans from the eastern provinces of the Reich, which emerge along with the progressive dementia of one of the novel’s main characters.

Experimental Programs: High speed computer programming in the junior high school

1963 ◽  
Vol 56 (7) ◽  
pp. 535-537
Author(s):  
Raymond Sweet
Keyword(s):  
High School ◽  
Junior High School ◽  
High Speed ◽  
Computer Programming ◽  
Junior High ◽  
School Library ◽  
The Past ◽  
The Subject ◽  
Geometry Class ◽  
Speed Computer

Each time that a mathematics project has been assigned here in the past few years, several students have indicated an interest in computers. Until recently none of the teachers had any training in the computer's use and the school library had no books pertaining to the subject. Last year, within four months after the arrival of a text describing the construction of several homemade computers, boys in an accelerated geometry class turned in three small computers for their term projects.

The Purpose and Program of a Family Case Work Agency

The Family ◽  
1939 ◽  
Vol 20 (1) ◽  
pp. 3-7
Author(s):  
Linton B. Swift
Keyword(s):  
Membership Committee ◽  
Discussion Groups ◽  
Family Welfare ◽  
Work Program ◽  
The Past ◽  
Full Treatment ◽  
The Family ◽  
Family Case ◽  
The Subject ◽  
Case Work

At the request of the Family Welfare Association of America Membership Committee, Mr. Swift has prepared this interpretation as Part I of the Association's “Interpretation of Membership Requirements,” and has carefully revised it on the basis of comments from the Membership Committee and others in the field. It is greatly condensed from material he has developed during the past five or six years in discussion groups throughout the country, and in this abbreviated form it necessarily omits much that is essential to a full treatment of the subject. It is published here because of its possible usefulness in local discussions of social case work program, regardless of Association membership.

The Significance of the Past in the Study of Ageing: Introduction to the Special Issue on History and Ageing

1984 ◽  
Vol 4 (4) ◽  
pp. 379-389 ◽  
Author(s):  
Peter Laslett
Keyword(s):  
Family Relationships ◽  
The Elderly ◽  
Elderly Persons ◽  
Special Issue ◽  
Old People ◽  
The Past ◽  
Familial Support ◽  
The Family ◽  
The Subject ◽  
Long Life

‘These days no-one bothers with old people, not even their children or their relatives.’ This familiar falsehood is important to us here because of its initial phrase, two words which are very often met with in familiar conversation and which imply comparison with the past. The statement is false both because research on the family relationships of the elderly shows it to be so today, and because historical work fails to show that familial support has declined over time. Comparisons with the past, scholarly comparisons properly worked out, which illustrate what history can tell us about ageing and about ourselves as members of populations marked by long life and by the presence of many elderly persons, are the subject of the present issue of Ageing and Society.

scholarly journals Returning to the Past: The Germans as a Historical Trauma in Contemporary Czech Prose

Porównania ◽  
2020 ◽  
Vol 27 (2) ◽  
pp. 59-76
Author(s):  
Alena Šidáková Fialová
Keyword(s):  
Historical Trauma ◽  
Second World War ◽  
The Novel ◽  
World War ◽  
The Past ◽  
Family Saga ◽  
The Holocaust ◽  
The Family ◽  
The Subject ◽  
Second World

This study describes reflections of wartime and postwar historical trauma in contemporary Czech prose, taking into account the issues surrounding Central Europe, which entirely overlap with the traditional confrontation between the Czechs and Germans. It also includes the changing reflections on Germany and the Germans, the Second World War and the subsequent expulsion found in the prose work of the new millennium, the unifying topic being deemed to be the issue of the ambiguous national identification of the protagonists, the detabooization of previously hushed-up subjects and the subject of the Holocaust, particularly in the family saga genre. It also takes into account groups of texts focusing on reflections of anti-German resistance activities, both in the genre of the novel (with detective elements) and in output on the boundaries between fiction and factographic prose.

The on-line use of histogram data for high-speed correction and alignment of electron microscope images

1984 ◽  
Vol 42 ◽  
pp. 556-557
Author(s):  
William Krakow
Keyword(s):  
Power Spectrum ◽  
High Speed ◽  
Direct Memory Access ◽  
Digital Television ◽  
Contrast Transfer Function ◽  
The Past ◽  
High Resolution Tem ◽  
On Line ◽  
Correction Of Astigmatism ◽  
The Fourier Transform

In the past few years on-line digital television frame store devices coupled to computers have been employed to attempt to measure the microscope parameters of defocus and astigmatism. The ultimate goal of such tasks is to fully adjust the operating parameters of the microscope and obtain an optimum image for viewing in terms of its information content. The initial approach to this problem, for high resolution TEM imaging, was to obtain the power spectrum from the Fourier transform of an image, find the contrast transfer function oscillation maxima, and subsequently correct the image. This technique requires a fast computer, a direct memory access device and even an array processor to accomplish these tasks on limited size arrays in a few seconds per image. It is not clear that the power spectrum could be used for more than defocus correction since the correction of astigmatism is a formidable problem of pattern recognition.

An atomic-resolution microscope study of Al contracts on GaAs

1986 ◽  
Vol 44 ◽  
pp. 726-727
Author(s):  
Z. Liliental-Weber ◽  
C. Nelson ◽  
R. Ludeke ◽  
R. Gronsky ◽  
J. Washburn
Keyword(s):  
High Speed ◽  
Schottky Contacts ◽  
Detailed Knowledge ◽  
The Past ◽  
Semiconductor Interfaces ◽  
Deposited Metal ◽  
Microwave Applications ◽  
Free Interfaces ◽  
Potential Use

The properties of metal/semiconductor interfaces have received considerable attention over the past few years, and the Al/GaAs system is of special interest because of its potential use in high-speed logic integrated optics, and microwave applications. For such materials a detailed knowledge of the geometric and electronic structure of the interface is fundamental to an understanding of the electrical properties of the contact. It is well known that the properties of Schottky contacts are established within a few atomic layers of the deposited metal. Therefore surface contamination can play a significant role. A method for fabricating contamination-free interfaces is absolutely necessary for reproducible properties, and molecularbeam epitaxy (MBE) offers such advantages for in-situ metal deposition under UHV conditions

Analisis Perbandingan Manajemen Keuangan Ojek Online Dan Ojek Reguler Studi Kasus Kecamatan Duren Sawit Jakarta Timur

Liquidity ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 41-52
Author(s):  
M. Koesmawan ◽  
Darwin Erhandy ◽  
Dede Dahlan
Keyword(s):  
Financial Management ◽  
Average Income ◽  
Savings And Loans ◽  
Financial Difficulties ◽  
The Family ◽  
Family Finances ◽  
The Subject ◽  
Almost All

In order to meet the needs of living which consists of primary as well as secondary needs, human can work in either a formal or an informal job. One of the informal jobs that is became the subject of this research was to become an ojek driver. Ojek is a ranting motorcycle.  Revenue of ojek drivers, accordingly, should be well managed following the concept of financial management. This research was conducted for the driver of the online motorcycle drivers as well as the regular motorcycle drivers they are called “The Ojek”. Ojek’s location is in Kecamatan (subdistrict) Duren Sawit, East Jakarta with 70 drivers of ojeks. The online ojeks earn an average of Rp 100,000 per day, can save Rp 11,000 to 21,000 per day, while, the regular ojek has an average income per day slightly lower amounted to Rp 78,500, this kind of ojeks generally have other businesses and always record the outflow of theirs money. Both the online and regular ojeks feel a tight competition in getting passengers, but their income can help the family finances and both ojeks want a cooperative especially savings and loans, especially to overcome the urgent financial difficulties. Almost all rivers, do not dare to borrow money. They are afraid of can not refund the money as scheduled.

Sign in / Sign up

Export Citation Format

Share Document