Dynamics Analysis of the Deployment of Miura-Origami Sheets

2019 ◽  
Author(s):  
Yutong Xia ◽  
Kon-Well Wang
Keyword(s):  
High Speed ◽  
The Other ◽  
Transverse Motion ◽  
Axial Deformation ◽  
Promising Tool ◽  
Large Structures ◽  
Other Hand ◽  
Structural Inertia ◽  
Close Relationship ◽  
Deployment Dynamics

Abstract Origami has emerged as a promising tool for the design of mechanical structures that can be folded into small volume and expanded to large structures, which enables the desirable features of compact storage and effective deployment. Most attention to date on origami deployment has been on its geometry, kinematics, and quasi-static mechanics, while the dynamics of deployment has not been systematically studied. On the other hand, deployment dynamics could be important in many applications, especially in high speed operation and low damping conditions. This research investigates the dynamic characteristics of the deploying process of origami structures through investigating a Miura-Ori sheet (Fig. 1(b, c)). In this study, we have utilized the stored energy in pre-deformed spring elements to actuate the deployment. We theoretically model and numerically analyze the deploying process of the origami sheet. Specifically, the sheet is modeled by bar-and-hinge blocks, in which the facet and crease stiffnesses are modeled to be related to the bar axial deformation and torsional motion at the creases. On the other hand, the structural inertia is modelled as mass points assigned at hinges. Numerical simulations show that, apart from axial contraction and expansion, the origami structure can exhibit transverse motion during the deploying process. Further investigation reveals that the transverse motion has close relationship with the controlled deploying rate. This research will pave the way for further analysis and applications of the dynamics of origami-based structures.

Albrecht Durer and the 16TH Century Melancholy

2020 ◽  
Vol 2 ◽  
pp. 37-49
Author(s):  
Marcel Henrique Rodrigues
Keyword(s):  
Religious Culture ◽  
The Other ◽  
16Th Century ◽  
Other Hand ◽  
Close Relationship ◽  
The One ◽  
Deep Sense

Little has been discussed in academia about the close relationship between the Renaissance of the 16th century and melancholy humor, and esoteric elements arising mainly from Florentine Neoplatonism. The link between melancholy and esotericism becomes very clear when we analyze the gravure “Melencolia I” by Albrecht Dürer (1471-1528), composed of a significant number of symbols that refer to an esoteric religious culture that then emerged. Renaissance melancholy gained several nuances. On the one hand, it was considered a sin, a despicable mood characteristic of witches; on the other hand, a deep sense of inspiration typical of men of “genius”. This ambivalence also occurred in the firmament, as the melancholic people were guided by the dark planet Saturn, according to astrological belief. We also have the cultural scenario of the 16th century, especially in Dürer's Germany, which contributed to strengthening the melancholy issues.

Epodes

1972 ◽  
Vol 6 ◽  
pp. 6-14
Keyword(s):  
Social Status ◽  
Lyric Poetry ◽  
The Other ◽  
Similar Attitude ◽  
Other Hand ◽  
Close Relationship

Horace was writing hisEpodes1at the same time as he was writingSatires. The nameEpodesis derived from the metrical term ό ἐπῳδός (і.е. στίχος) which signifies the second and shorter line of a couplet, but Horace himself referred to them asiambi(soEpod. 14. 7,Epist. i. 19. 23). The collection is titledLiber Epodonin the MSS. and the title was used by grammarians of the fourth and fifth centuries. Butiambigives a better idea of their basic inspiration. Horace says of them(Epist. i. 19. 21-5):So he claims(a)originality,(b)Archilochus as a model,(c)that he was the first Roman to use Archilochus as a model, and(d)that he discarded the vicious personal invective of Archilochus. The judgement disregards Catullus, who had writteniambibefore Horace, but whose similarity to Archilochus did not extend far beyond metre and invective. There is a consistency in Horace’s poetic career: he began by recreating the poetry of Archilochus in hisEpodes, and his later—and greatest— work was the recreation in hisOdesof the lyric poetry of poets like Sappho, Alcaeus, and Pindar. There is a similarly close relationship between theSatiresand theEpistles;and, furthermore, all of his writing uses an autobiographical technique. There is another sort of consistency too, for basicallyEpodesandSatiresexpress a similar attitude of mind: anger, contempt, and amusement are the fundamental emotions (though he often transcends these emotions in both works), and a plausible case can be made out for regarding this as a sign of a young man of low social status, unsure of himself and his talent, and already finding ways of expressing a personality that were not too self-revealing. TheOdesandEpistles, on the other hand, express a more meditative, more philosophical, more humane attitude, yet ultimately no more self-revealing.

Resolving the Lourinia armata (Claus, 1866) complex with remarks on the monophyletic status of Louriniidae, Monard 1927 (Copepoda: Harpacticoida)

Zootaxa ◽  
2021 ◽  
Vol 5051 (1) ◽  
pp. 346-386
Author(s):  
SÜPHAN KARAYTUĞ ◽  
SERDAR SAK ◽  
ALP ALPER ◽  
SERDAR SÖNMEZ
Keyword(s):  
Comparative Evaluation ◽  
Species Complex ◽  
Detailed Examination ◽  
The Other ◽  
Phylogenetic Position ◽  
Nicobar Island ◽  
Other Hand ◽  
The Family ◽  
Close Relationship ◽  
Almost All

An attempt was made to test if Lourinia armata (Claus, 1866)—as it is currently diagnosed—represents a species complex. Detailed examination and comparisons of several specimens collected from different localities suggest that L. armata indeed represents a complex of four closely related morphospecies that can be differentiated from one another by only detailed observations. One of the four species is identified as Lourinia aff. armata and the other three species are described as new to science and named as Lourinia wellsi sp. nov., L. gocmeni sp. nov., and L. aldabraensis sp. nov. Detailed review of previous species records indicates that the genus Lourinia Wilson, 1924 is distributed worldwide. Ceyloniella nicobarica Sewell, 1940, originally described from Nicobar Island and previously considered a junior subjective synonym of L. armata is reinstated as Lourinia nicobarica (Sewell, 1940) comb. nov. on the basis of the unique paddle-shaped caudal ramus seta V. It is postulated that almost all of these records are unreliable in terms of representing true Lourinia aff. armata described herein. On the other hand, the comparative evaluation of the illustrations and descriptions in the published literature indicates the presence of several new species waiting to be discovered in the genus Lourinia.                 It has been determined that, according to updated modern keys, the recent inclusion of the monotypic genus Archeolourinia Corgosinho & Schizas, 2013 in the Louriniidae is not justified since Archeolourinia shermani Corgosinho & Schizas, 2013 does not belong to this family but should be assigned to the Canthocamptidae. On the other hand, it has been argued that the exact phylogenetic position of the Louriniidae still remains problematic since none of the diagnostic characters supports the monophyly of the family within the Oligoarthra. It has also been argued that the close relationship between Louriniidae and Canthocamptidae is supported since both families share the homologous sexual dimorphism (apophysis) on P3 endopod. The most important characteristic that can possibly be used to define Louriniidae is the reduction of maxilliped.  

Aeroelastic Problems in connection with High-Speed Flight

1956 ◽  
Vol 60 (547) ◽  
pp. 459-475 ◽  
Author(s):  
E. G. Broadbent
Keyword(s):  
Mach Number ◽  
High Speed ◽  
The Other ◽  
Control Surface ◽  
The Past ◽  
Other Hand ◽  
Aerodynamic Derivatives ◽  
Mach Numbers ◽  
The One

SummaryA review is given of developments in the field of aeroelasticity during the past ten years. The effect of steadily increasing Mach number has been two-fold: on the one hand the aerodynamic derivatives have changed, and in some cases brought new problems, and on the other hand the design for higher Mach numbers has led to thinner aerofoils and more slender fuselages for which the required stiffness is more difficult to provide. Both these aspects are discussed, and various methods of attack on the problems are considered. The relative merits of stiffness, damping and massbalance for the prevention of control surface flutter are discussed. A brief mention is made of the recent problems of damage from jet efflux and of the possible aeroelastic effects of kinetic heating.

The diachronic relationship between demonstratives and first/second person pronouns

2012 ◽  
Vol 13 (1) ◽  
pp. 50-71 ◽  
Author(s):  
Osamu Ishiyama
Keyword(s):  
Historical Data ◽  
Functional Similarity ◽  
The Other ◽  
Common Source ◽  
Historical Sources ◽  
Second Person ◽  
Person Pronoun ◽  
Other Hand ◽  
Close Relationship ◽  
Third Person

It is well known that demonstratives are the cross-linguistically common source of third person pronouns due to the functional similarity between them. For this reason, they are morphologically related to or formally indistinguishable from one another in many languages. First and second person pronouns, on the other hand, typically have historical sources other than demonstratives. However, unlike the close relationship between demonstratives and third person pronouns, the fact that demonstratives and first/second person pronouns have a very tenuous diachronic relationship has not attracted much attention in previous studies. Based primarily on historical data from Japanese, the present study shows that there are at least three functional reasons why demonstratives do not usually give rise to first/second person pronouns. This study also discusses a limited context in which a demonstrative does develop into a second person pronoun.

scholarly journals FPGA-Based Synthesis of High-Speed Hybrid Carry Select Adders

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
V. Kokilavani ◽  
K. Preethi ◽  
P. Balasubramanian
Keyword(s):  
High Speed ◽  
Boolean Logic ◽  
The Other ◽  
Square Root ◽  
Verilog Hdl ◽  
Other Hand ◽  
Carry Select Adder

Carry select adder is a square-root time high-speed adder. In this paper, FPGA-based synthesis of conventional and hybrid carry select adders are described with a focus on high speed. Conventionally, carry select adders are realized using the following: (i) full adders and 2 : 1 multiplexers, (ii) full adders, binary to excess 1 code converters, and 2 : 1 multiplexers, and (iii) sharing of common Boolean logic. On the other hand, hybrid carry select adders involve a combination of carry select and carry lookahead adders with/without the use of binary to excess 1 code converters. In this work, two new hybrid carry select adders are proposed involving the carry select and section-carry based carry lookahead subadders with/without binary to excess 1 converters. Seven different carry select adders were implemented in Verilog HDL and their performances were analyzed under two scenarios, dual-operand addition and multioperand addition, where individual operands are of sizes 32 and 64-bits. In the case of dual-operand additions, the hybrid carry select adder comprising the proposed carry select and section-carry based carry lookahead configurations is the fastest. With respect to multioperand additions, the hybrid carry select adder containing the carry select and conventional carry lookahead or section-carry based carry lookahead structures produce similar optimized performance.

GMS Economic Corridors Under the Belt and Road Initiative

2019 ◽  
Vol 1 (2) ◽  
pp. 183-206
Author(s):  
Masami Ishida
Keyword(s):  
High Speed ◽  
Yunnan Province ◽  
Lao Pdr ◽  
The Other ◽  
Transport Infrastructure ◽  
Belt And Road Initiative ◽  
Other Hand ◽  
Belt And Road ◽  
The Government ◽  
The Belt And Road

The government of China promotes the development of expressways and high-speed expressways in Greater Mekong Subregion (GMS) and tries to connect the major cities of the subregion and Kunming under the Belt and Road Initiative (BRI). First, this article reviews the development schemes in the subregion including GMS economic cooperation and the BRI. Next, it introduces the development of the transport infrastructure, including expressways and high-speed railways, connecting Kunming and Lao People’s Democratic Republic (Lao PDR), Thailand, Myanmar and Vietnam. Thereafter, it compares the total costs of the projects and how other GMS countries negotiate with China. Seeing the sections of the expressways and railways in Yunnan Province, the shares of some sections occupied by bridges and tunnels are higher than 20 per cent due to the mountainous land feature of Yunnan Province. On the other hand, the railway in Lao PDR passes through the mountainous areas, and they adopted higher specification as same as in Yunnan Province. Consequently, the debt-default risk of Lao PDR has increased. On the other hand, Thailand repeated tough negotiations with China and made efforts not to increase the total cost. The negotiations of Lao PDR and Thailand with China are illustrated in this article. JEL Codes: O18, R10, R41, R58

Quantitative E-beam Probe for Valid High-Speed Measurements

1999 ◽  
Author(s):  
C. T. Salling
Keyword(s):  
Measurement Error ◽  
Transient Response ◽  
High Speed ◽  
Sampling Time ◽  
The Other ◽  
Other Hand ◽  
Timing Measurement ◽  
Time Accuracy ◽  
Accuracy And Repeatability ◽  
Measurement Capabilities

Abstract This paper presents the results of a study to assess the timing measurement capabilities of e-beam probes and how they compare to mechanical probes in terms of sampling time, accuracy, and repeatability. Analysis of the data indicates that the transient response of mechanical probes is prone to overshoot and ringing, which contributes significantly to measurement error and uncertainty. E-beam probes, on the other hand, are subject to charging effects and interference which, as the authors show, can be effectively eliminated, facilitating high-speed timing measurements accurate to within a few picoseconds.

Albrecht Dürer And The 16th Century Melancholy

2020 ◽  
Vol 7 (2) ◽  
pp. 95-108
Author(s):  
Marcel Henrique Rodrigues
Keyword(s):  
Religious Culture ◽  
The Other ◽  
16Th Century ◽  
Other Hand ◽  
Close Relationship ◽  
The One ◽  
Deep Sense

Little has been discussed in academia about the close relationship between the Renaissance of the 16th century and melancholy humor, and esoteric elements arising mainly from Florentine Neoplatonism. The link between melancholy and esotericism becomes very clear when we analyze the gravure “Melencolia I” by Albrecht Dürer (1471-1528), composed of a significant number of symbols that refer to an esoteric religious culture that then emerged. Renaissance melancholy gained several nuances. On the one hand, it was considered a sin, a despicable mood characteristic of witches; on the other hand, a deep sense of inspiration typical of men of “genius”. This ambivalence also occurred in the firmament, as the melancholic people were guided by the dark planet Saturn, according to astrological belief. We also have the cultural scenario of the 16th century, especially in Dürer's Germany, which contributed to strengthening the melancholy issues.

scholarly journals Nilai dan Pendidikan Nilai di Sekolah

2018 ◽  
Vol 5 (1) ◽  
pp. 108-125
Author(s):  
Agus Maimun
Keyword(s):  
Moral Reasoning ◽  
Educational Process ◽  
The Other ◽  
Good Thing ◽  
Religious Values ◽  
Human Beings ◽  
Educational Value ◽  
Self Confidence ◽  
Other Hand ◽  
Close Relationship

Value is the essence which causes it to be appropriate to be done by human beings. Value has close relationship with goodness. Although both of them are not same. remembering that a good thing does not always have high value for someone or on the contrary, in order value to be a part of individual, then it needs to be given through educational process. Educational value is not only one thing that increases. On the other hand, it is an essential thing in the whole educational process. Some religious values and humanity values that need to be fought in educational process in school are ikhlas, tawaddu ', ashamed, qonaah, zuhud, iffah, eagerness, honest, care ness and empathy, cooperative, brave, great heart and commitment, fear, like helping, honesty and integrity, humor, independence and self confidence, self discipline, loyalty, patient, feel proud, cleaver, respect, responsible and tolerance. However, approach that is used in educational value includes evocation approach, inculcation approach, awareness approach, moral reasoning, value analyses approach, value clarification, commitment approach, and union approach.

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