Big influence of small random imperfections in origami-based metamaterials

2020 ◽  
Vol 476 (2241) ◽  
pp. 20200236
Author(s):  
Ke Liu ◽  
Larissa S. Novelino ◽  
Paolo Gardoni ◽  
Glaucio H. Paulino
Keyword(s):  
Numerical Simulations ◽  
Mechanical Behaviour ◽  
The Other ◽  
Basic Pattern ◽  
Geometric Imperfections ◽  
Compressive Stiffness ◽  
Compressive Response ◽  
Other Hand

Origami structures demonstrate great theoretical potential for creating metamaterials with exotic properties. However, there is a lack of understanding of how imperfections influence the mechanical behaviour of origami-based metamaterials, which, in practice, are inevitable. For conventional materials, imperfection plays a profound role in shaping their behaviour. Thus, this paper investigates the influence of small random geometric imperfections on the nonlinear compressive response of the representative Miura-ori, which serves as the basic pattern for many metamaterial designs. Experiments and numerical simulations are used to demonstrate quantitatively how geometric imperfections hinder the foldability of the Miura-ori, but on the other hand, increase its compressive stiffness. This leads to the discovery that the residual of an origami foldability constraint, given by the Kawasaki theorem, correlates with the increase of stiffness of imperfect origami-based metamaterials. This observation might be generalizable to other flat-foldable patterns, in which we address deviations from the zero residual of the perfect pattern; and to non-flat-foldable patterns, in which we would address deviations from a finite residual.

scholarly journals Legalisasi Lotto di Makassar, 1967-1969

2019 ◽  
Vol 6 (2) ◽  
pp. 35
Author(s):  
Fitri Handayani ◽  
Mustari Bosra
Keyword(s):  
Regional Development ◽  
Research Methods ◽  
Descriptive Analysis ◽  
Historical Research ◽  
The Other ◽  
Basic Pattern ◽  
Analysis Study ◽  
Other Hand ◽  
The One ◽  
The Impact

Penelitian ini bertujuan untuk mengetahui latar belakang legalisasi Lotto di Makassar, dinamika penyelenggaraan Lotto di Makassar, serta dampak legalisasi Lotto dalam kehidupan masyarakat Makassar. Penelitian ini merupakan penelitian deskriptif-analisis dengan menggunakan metode penelitian sejarah melalui tahap heurisik, kritik, interpretasi dan historiografi. Hasil penelitian yang disajikan dalam tulisan ini menunjukkan bahwa Pola dasar pembangunan daerah Kotamadya Makassar yang berisikan pemberantasan kemiskinan, kebodohan dan kemelaratan (3K) sesuai dengan PELITA terhambat karena kurangnya dana. Walikota Kotamadya Makassar pada saat itu, H.M. Dg. Patompo mencari jalan keluar dengan mengumpulkan dana pembangunan inkonvensional berupa pajak perjudian dengan memilih Lotere Totalisator (Lotto) yang saat itu marak diselenggarakan di Kota lain. Dari hasil penelitian ini dapat disimpulkan bahwa penyelenggaraan Lotto di Makassar pada satu sisi mampu membantu menambah pendapatan asli daerah, namun pada sisi lain Lotto ini juga menjadi virus yang membuat pemikiran spekulatif berkembang dikalangan masyarakat yaitu dengan mendapatkan untung dari hasil Lotto tanpa harus bekerja keras dan juga menghilangkan budaya siri’ yang dianut oleh masyarakat Bugis Makassar.Kata Kunci: Lotto, Makassar, dan PajakThis study aims to determine the background of Lotto legalization in Makassar, the dynamics of the implementation of Lotto in Makassar, and the impact of Lotto legalization on the lives of Makassar people. This research is a descriptive-analysis study using historical research methods through the heurisic, criticism, interpretation and historiography stages. The results of the study presented in this paper show that the basic pattern of regional development in the Municipality of Makassar which contains poverty, ignorance and poverty (3K) in accordance with PELITA is hampered due to lack of funds. The Mayor of Makassar Municipality at the time, H.M. Dg. Patompo sought a way out by collecting unconventional development funds in the form of a gambling tax by selecting Lottery Totalisator (Lotto), which at that time was rife in other cities. From the results of this study it can be concluded that the implementation of Lotto in Makassar on the one hand is able to help increase local original income, but on the other hand this Lotto is also a virus that makes speculative thinking develop among the community by getting profits from Lotto results without having to work hard and also eliminating siri’ culture adhered to by the Bugis Makassar community.Keywords: Lotto, Makassar and Tax 

Effects of bi-isotropic coatings and bi-isotropic background media upon gain characteristics of an axially slotted cylinder

2016 ◽  
Vol 9 (5) ◽  
pp. 1093-1102 ◽  
Author(s):  
Z. A. Awan
Keyword(s):  
Numerical Simulations ◽  
Significant Role ◽  
Free Space ◽  
Forward Direction ◽  
The Other ◽  
Rear Side ◽  
Background Medium ◽  
Other Hand

An analysis about the effects of various bi-isotropic (BI) coatings and BI background media upon the gain characteristics of an axially slotted cylinder using numerical simulations is presented. It is investigated that chirality and Tellegen parameters of a coating and a background medium play a significant role in modifying the gain properties. It is further studied that an axially slotted cylinder when coated with a strong BI material and embedded in a free space background significantly enhances the gain in the forward direction. On the other hand, a strong Tellegen coating guides most of the radiated field from an axial slot toward rear side of the cylinder.

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

Life Beyond 1MeV

1980 ◽  
Vol 38 ◽  
pp. 30-33
Author(s):  
K.H. Westmacott
Keyword(s):  
Electron Microscopy ◽  
Past Experience ◽  
The Other ◽  
Good Case ◽  
Other Hand ◽  
The U.S

Life beyond 1MeV – like life after 40 – is not too different unless one takes advantage of past experience and is receptive to new opportunities. At first glance, the returns on performing electron microscopy at voltages greater than 1MeV diminish rather rapidly as the curves which describe the well-known advantages of HVEM often tend towards saturation. However, in a country with a significant HVEM capability, a good case can be made for investing in instruments with a range of maximum accelerating voltages. In this regard, the 1.5MeV KRATOS HVEM being installed in Berkeley will complement the other 650KeV, 1MeV, and 1.2MeV instruments currently operating in the U.S. One other consideration suggests that 1.5MeV is an optimum voltage machine – Its additional advantages may be purchased for not much more than a 1MeV instrument. On the other hand, the 3MeV HVEM's which seem to be operated at 2MeV maximum, are much more expensive.

Can the Academic Self-Concept be Positive and Realistic?

2005 ◽  
Vol 19 (3) ◽  
pp. 129-132 ◽  
Author(s):  
Reimer Kornmann
Keyword(s):  
Academic Performance ◽  
Opposite Effect ◽  
Self Esteem ◽  
Point Of View ◽  
The Other ◽  
Self Concept ◽  
High Ability ◽  
Self Image ◽  
Other Hand

Summary: My comment is basically restricted to the situation in which less-able students find themselves and refers only to literature in German. From this point of view I am basically able to confirm Marsh's results. It must, however, be said that with less-able pupils the opposite effect can be found: Levels of self-esteem in these pupils are raised, at least temporarily, by separate instruction, academic performance however drops; combined instruction, on the other hand, leads to improved academic performance, while levels of self-esteem drop. Apparently, the positive self-image of less-able pupils who receive separate instruction does not bring about the potential enhancement of academic performance one might expect from high-ability pupils receiving separate instruction. To resolve the dilemma, it is proposed that individual progress in learning be accentuated, and that comparisons with others be dispensed with. This fosters a self-image that can in equal measure be realistic and optimistic.

Stories and the Self

2020 ◽  
Vol 32 (2) ◽  
pp. 47-58 ◽  
Author(s):  
Stefan Krause ◽  
Markus Appel
Keyword(s):  
Meta Analysis ◽  
The Self ◽  
The Other ◽  
Lower Degree ◽  
Contrast Effects ◽  
Self Perception ◽  
Self Perceptions ◽  
Other Hand ◽  
The One ◽  
Implicit And Explicit

Abstract. Two experiments examined the influence of stories on recipients’ self-perceptions. Extending prior theory and research, our focus was on assimilation effects (i.e., changes in self-perception in line with a protagonist’s traits) as well as on contrast effects (i.e., changes in self-perception in contrast to a protagonist’s traits). In Experiment 1 ( N = 113), implicit and explicit conscientiousness were assessed after participants read a story about either a diligent or a negligent student. Moderation analyses showed that highly transported participants and participants with lower counterarguing scores assimilate the depicted traits of a story protagonist, as indicated by explicit, self-reported conscientiousness ratings. Participants, who were more critical toward a story (i.e., higher counterarguing) and with a lower degree of transportation, showed contrast effects. In Experiment 2 ( N = 103), we manipulated transportation and counterarguing, but we could not identify an effect on participants’ self-ascribed level of conscientiousness. A mini meta-analysis across both experiments revealed significant positive overall associations between transportation and counterarguing on the one hand and story-consistent self-reported conscientiousness on the other hand.

Don’t Put Me in This Group

2019 ◽  
Vol 50 (2) ◽  
pp. 80-93
Author(s):  
Jort de Vreeze ◽  
Christina Matschke
Keyword(s):  
Positive Emotions ◽  
Negative Emotions ◽  
Negative Information ◽  
The Self ◽  
The Other ◽  
Other Hand ◽  
Group Memberships

Abstract. Not all group memberships are self-chosen. The current research examines whether assignments to non-preferred groups influence our relationship with the group and our preference for information about the ingroup. It was expected and found that, when people are assigned to non-preferred groups, they perceive the group as different to the self, experience negative emotions about the assignment and in turn disidentify with the group. On the other hand, when people are assigned to preferred groups, they perceive the group as similar to the self, experience positive emotions about the assignment and in turn identify with the group. Finally, disidentification increases a preference for negative information about the ingroup.

ON THE OTHER HAND

1961 ◽  
Vol 6 (6) ◽  
pp. 222-223
Author(s):  
Edwin G. Boring
Keyword(s):  
The Other ◽  
Other Hand
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