bluuebunny/crossref_metadata_2025_split huggingface dataset:
Random Threshold Digraphs
Authors: Reilly Elizabeth , Scheinerman Edward , Zhang Yiguang 
Published: January 2020

This paper introduces a notion of a random threshold directed graph, extending the work of Reilly and Scheinerman in the undirected case and closely related to random Ferrers digraphs.We begin by presenting the main definition: $D$ is a threshold digraph provided we can find a pair of weighting functions $f,g:V(D)\to\mathbb{R}$ such that for distinct $v,w\in V(D)$ we have $v\to w$ iff $f(v)+g(w)\ge1$. We also give an equivalent formulation based on an order representation that is purely combinatorial (no arithmetic). We show that our formulations are equivalent to the definition in the work of Cloteaux, LaMar, Moseman, and Shook in which the focus is on the degree sequence, and present a new characterization theorem for threshold digraphs.We then develop the notion of a random threshold digraph formed by choosing vertex weights independently and uniformly at random from $[0,1]$. We show that this notion of a random threshold digraph is equivalent to a purely combinatorial approach, and present a formula for the probability of a digraph based on counting linear extensions of an auxiliary partially ordered set.We capitalize on this equivalence to develop exact and asymptotic properties of random threshold digraphs such as the number of vertices with in-degree (or out-degree) equal to zero, domination number, connectivity and strong connectivity, clique and independence number, and chromatic number.
Lines in Higgledy-Piggledy Arrangement
Authors: Fancsali Szabolcs L. , Sziklai Péter 
Published: January 2020

In this article, we examine sets of lines in $\mathsf{PG}(d,\mathbb{F})$ meeting each hyperplane in a generator set of points. We prove that such a set has to contain at least $\lfloor1.5d\rfloor$ lines if the field $\mathbb{F}$ has at least $\lfloor1.5d\rfloor$ elements, and at least $2d-1$ lines if the field $\mathbb{F}$ is algebraically closed. We show that suitable $2d-1$ lines constitute such a set (if $|\mathbb{F}|\ge2d-1$), proving that the lower bound is tight over algebraically closed fields. At last, we will see that the strong $(s,A)$ subspace designs constructed by Guruswami and Kopparty have better (smaller) parameter $A$ than one would think at first sight.
Faster Rumor Spreading With Multiple Calls
Authors: Panagiotou Konstantinos , Pourmiri Ali , Sauerwald Thomas 
Published: January 2020

We consider the random phone call model introduced by Demers et al., which is a well-studied model for information dissemination on networks. One basic protocol in this model is the so-called Push protocol which proceeds in synchronous rounds. Starting with a single node which knows of a rumor, every informed node calls in each round a random neighbor and informs it of the rumor. The Push-Pull protocol works similarly, but additionally every uninformed node calls a random neighbor and may learn the rumor from it.It is well-known that both protocols need $\Theta(\log n)$ rounds to spread a rumor on a complete network with $n$ nodes. Here we are interested in how much the spread can be speeded by enabling nodes to make more than one call in each round. We propose a new model where the number of calls of a node is chosen independently according to a probability distribution $R$. We provide both lower and upper bounds on the rumor spreading time depending on statistical properties of $R$ such as the mean or the variance (if they exist). In particular, if $R$ follows a power law distribution with exponent $\beta \in (2,3)$, we show that the Push-Pull protocol spreads a rumor in $\Theta(\log \log n)$ rounds. Moreover when $\beta=3$, the Push-Pull protocol spreads a rumor in $\Theta(\frac{ \log n}{\log\log n})$ rounds.
Polygons as Sections of Higher-Dimensional Polytopes
Authors: Padrol Arnau , Pfeifle Julian 
Published: January 2020

We show that every heptagon is a section of a $3$-polytope with $6$ vertices. This implies that every $n$-gon with $n\geq 7$ can be obtained as a section of a $(2+\lfloor\frac{n}{7}\rfloor)$-dimensional polytope with at most $\lceil\frac{6n}{7}\rceil$ vertices; and provides a geometric proof of the fact that every nonnegative $n\times m$ matrix of rank $3$ has nonnegative rank not larger than $\lceil\frac{6\min(n,m)}{7}\rceil$. This result has been independently proved, algebraically, by Shitov (J. Combin. Theory Ser. A 122, 2014).
Energies and Structure of Additive Sets
Authors: Ilya Shkredov 
Published: January 2020

In this paper we prove that any sumset or difference set has large $\textsf{E}_3$ energy. Also, we give a full description of families of sets having critical relations between some kind of energies such as $\textsf{E}_k$, $\textsf{T}_k$ and Gowers norms. In particular, we give criteria for a set to be a set of the form $H\dotplus \Lambda$, where $H+H$ is small and $\Lambda$ has "random structure",set equal to a disjoint union of sets $H_j$ each with small doubling,set having a large subset $A'$ with $2A'$ equal to a set with small doubling and $|A'+A'| \approx |A|^4 / \textsf{E}(A)$.
Faces of Birkhoff Polytopes
Authors: Paffenholz Andreas 
Published: January 2020

The Birkhoff polytope $B_n$ is the convex hull of all $(n\times n)$ permutation matrices, i.e., matrices where precisely one entry in each row and column is one, and zeros at all other places. This is a widely studied polytope with various applications throughout mathematics.In this paper we study combinatorial types $\mathcal L$ of faces of a Birkhoff polytope. The Birkhoff dimension $\mathrm{bd}(\mathcal L)$ of $\mathcal L$ is the smallest $n$ such that $B_n$ has a face with combinatorial type $\mathcal L$.By a result of Billera and Sarangarajan, a combinatorial type $\mathcal L$ of a $d$-dimensional face appears in some $\mathcal B_k$ for $k\le 2d$, so $\mathrm{bd}(\mathcal L)\le 2d$. We will characterize those types with $\mathrm{bd}(\mathcal L)\ge 2d-3$, and we prove that any type with $\mathrm{bd}(\mathcal L)\ge d$ is either a product or a wedge over some lower dimensional face. Further, we computationally classify all $d$-dimensional combinatorial types for $2\le d\le 8$.
Keeping Avoider's Graph Almost Acyclic
Authors: Clemens Dennis , Ehrenmüller Julia , Person Yury , Tran Tuan 
Published: January 2020

We consider biased $(1:b)$ Avoider-Enforcer games in the monotone and strict versions. In particular, we show that Avoider can keep his graph being a forest for every but maybe the last round of the game if $b \geq 200 n \ln n$. By this we obtain essentially optimal upper bounds on the threshold biases for the non-planarity game, the non-$k$-colorability game, and the $K_t$-minor game thus addressing a question and improving the results of Hefetz, Krivelevich, Stojaković, and Szabó. Moreover, we give a slight improvement for the lower bound in the non-planarity game.
Bermain dan Berkreasi untuk Melatih Perkembangan Anak Usia Dini Menggunakan Puzzle Edukatif dari Bahan Bambu
Authors: Purwanto Purwanto - 
Published: January 2020

<p>Perkembangan kognitif merupakan dasar bagi kemampuan anak untuk berpikir, berkreativitas dan berkarya. Dalam pemenuhnan kebutuhan akan perkembangan anak dapat dilakukan dengan bermain sambil berkreasi, karena dengan bermain anak akan menerima pengalaman baru, berimajinasi ide, berinteraksi dengan orang lain, lingkungan dan mulai merasakan dunia mereka. Salah satu permasalahan yang ada di kelompok bermain Amongsiwi di Bantul adalah kurang optimalnya perkembangan kognitif anak-anak dan kurang tersedianya sarana alat peraga edukatif seperti permainan <em>puzzle</em>. Untuk itu dalam penelitian ini bertujuan untuk mengajak anak bermain dan berkreasi untuk mengembangkan kognitis anak menggunakan <em>puzzle </em>edukatif dari bahan bambu yang layak dan ramah lingkungan, apalagi di sekolah ini ada program khusus bermain dan berkreasi setiap hari Jum’at. Dalam penelitian ini digunakan metode penelitian pengembangan (<em>research and development</em>) dengan melakukan kegiatan meliputi analisis potensi dan masalah, pengumpulan data, membuat desain produk, ujicoba produk, uji pemakaian. Dalam pengumpulan data dilakukan observasi, wawancara, dan dokumentasi kemudian data dianalisis secara deskriptif kuantitatif. Hasil penelitian menunjukkan bahwa <em>puzzle</em> edukatif yang dirancang secara materi layak untuk diujicobakan, sedangkan hasil respon anak terhadap penggunaan media<em> puzzle</em> edukatif mencapai 85 % yang ini menunjukkan kategori layak. Selanjutnya berdasarkan hasil pengamatan dan wawancara selama kegiatan bermain dan berkreasi anak-anak dapat menghasilkan karya produk yang sudah berbentuk bangun misalnya robot-robotan atau mobil-mobilan. Berdasarkan hasil penelitian yang telah dilakukan dapat disimpulkan bahwa media <em>puzzle </em>edukatif dari bahan bambu dapat membantu anak bermain dan berkreasi sebagai salah satu unsur dalam pengembangan kognitif anak dan menghasilkan sebuah alat peraga edukatif yang layak untuk digunakan.</p>
Ratio effect slope can sometimes be an appropriate metric of the approximate number system sensitivity
Authors: Krajcsi Attila 
Published: January 2020

AbstractThe approximate number system (ANS) is believed to be an essential component of numerical understanding. The sensitivity of the ANS has been found to be correlating with various mathematical abilities. Recently, Chesney (2018, Attention, Perception, & Psychophysics, 80[5], 1057–1063) demonstrated that if the ANS sensitivity is measured with the ratio effect slope, the slope may measure the sensitivity imprecisely. The present work extends her findings by demonstrating that mathematically the usability of the ratio effect slope depends on the Weber fraction range of the sample and the ratios of the numbers in the used test. Various indexes presented here can specify whether the use of the ratio effect slope as a replacement for the sigmoid fit is recommended or not. Detailed recommendations and a publicly available script help the researchers to plan or evaluate the use of the ratio effect slope as an ANS sensitivity index.
The Pitch-angle Distributions of Suprathermal Ions near an Interplanetary Shock
Authors: Yang Liu , Berger Lars , Wimmer-Schweingruber Robert F. , Wang Linghua , Yu Jia , Galvin Antoinette B. , Möbius Eberhard 
Published: January 2020

Abstract
We present a case study of the pitch-angle distributions (PADs) of suprathermal H+, He2+ at ∼10–40 keV/nuc and He+ at ∼8–20 keV/nuc near a reverse shock of a stream interaction region observed by the Plasma and Suprathermal Ion Composition instrument on board the Solar Terrestrial Relations Observatory Ahead spacecraft on 2008 March 9. We find that in both the downstream and upstream region close to the shock, the shocked particles of all three species appear to have a power-law-like spectrum at these suprathermal energies. The PADs of these three species show very similar behavior: in the downstream region, the phase space density appears to be significantly higher in the direction perpendicular to the interplanetary magnetic field (IMF) than in the parallel direction, along which particles accelerated at the shock front are supposed to escape into the downstream region. In the upstream region, the PADs of all three species show a clear beam in the direction antiparallel to the IMF due to the escaping particles from the shock into the upstream region. In addition, we find that suprathermal He+ shows a signature of bidirectional beams in the upstream region very close to the shock. These results suggest that H+, He2+ at ∼10–40 keV/nuc and He+ at ∼8–20 keV/nuc could be accelerated similarly at interplanetary shocks and that shock drift acceleration likely plays an important role in the in situ acceleration of low-energy suprathermal ions.
Dépôt psychique familial, groupe institutionnel « extra-large »… et enjeux de transformation
Authors: Sanahuja Maria de la Almudena , Bernard Alexandra 
Published: January 2020

Cet article se propose, à partir d’une clinique spécifique familiale, celle de l’obésité pédiatrique, de mettre en avant l’importance de la prise en compte par le clinicien, des répercussions de l’inconscient familial en institution(s). À partir d’un exemple clinique paradigmatique, nous montrerons le déploiement de la « psyché familiale » sur la scène d’un réseau institutionnel, où même au sein d’un fonctionnement de « groupe extra-large », nous verrons les effets du « transfert-subjectal » sur les équipes professionnelles en termes d’homologie pathologique ou fonctionnel. Pour ne pas « se laisser prendre » par les avatars de fonctionnement liés à la non-symbolisation, et permettre ainsi une régulation collective, l’analyse de ces enjeux familiaux implique celle du fonctionnement de groupe et des liens de réseaux institutionnels, afin de réaliser un travail de transformation.
Prédire et mesurer l’incommensurable : à propos d’un dispositif techno-médical contemporain
Authors: Peretti Pascale 
Published: January 2020

Dans un contexte social où les évolutions idéologiques et technoscientifiques induisent de nouveaux rapports au savoir, et de nouvelles formes de pouvoir, leur impact sur la (re)production des subjectivités est à considérer. Aussi cet article interroge-t-il les incidences subjectives de nouveaux instruments techno-médicaux, tels que les tests génétiques pré-symptomatiques, tout en tentant de montrer précisément en quoi ce type d’appareillage médical pourrait relever du « dispositif » foucaldien. En particulier, c’est à travers l’exemple du test prédictif à la maladie de Huntington que sont explorés les retentissements psychiques d’un tel dispositif, notamment dans ce qu’il produit comme rapports à la temporalité, à la finitude, à la liberté et à l’assignation identitaire. Dans cette perspective, c’est à travers une mécanique de dé-subjectivation que sera analysé le pouvoir d’asservissement d’un tel outil technique.
Sobre el matrimonio de los magistrados de las Audiencias indianas : prohibición real y defensa judicial de los ministros inculpados en el siglo xvii
Authors: González Inés Gómez 
Published: January 2020

Desde el siglo xvi la monarquía prohibió a los magistrados de las Audiencias americanas y a sus familiares contraer matrimonio en su distrito sin licencia, con el fin de aislarlos socialmente y conseguir así su imparcialidad. Esta prohibición, que fue muy controvertida en la época, ya que iba contra la libertad de matrimonio reconocida por el derecho canónico, no impidió sin embargo que lo ministros y sus hijos se casaran en el territorio de su jurisdicción. De hecho, la corona concedió y vendió muchas licencias y, además, hubo magistrados que celebraron sus bodas sin las debidas dispensas y no fueron castigados por ello. En este trabajo estudiaré el proceso contra cuatro jueces de las Audiencias de Panamá, Charcas, Lima y Chile, que sí fueron condenados por sortear la prohibición. Me centraré especialmente en sus estrategias de defensa, para lo que analizaré las alegaciones jurídicas (porcones), que hicieron circular en el transcurso de la causa judicial
Manuscrits d’auteur, norme linguistique et « critique des variantes » dans la tradition littéraire italienne
Authors: Vento Christian Del 
Published: January 2020

En 1783, Vittorio Alfieri se rend à Ferrare pour consulter les manuscrits de l’Arioste. Il annote les variantes du Roland Furieux. Ce n’est pas un acte d’érudition mais une démarche poétique : il s’inscrit par ce geste dans une tradition qui remonte à la Renaissance, au cours de laquelle une nouvelle approche des manuscrits d’auteur avait vu le jour. L’étude des manuscrits autographes et des variantes d’auteur, rendue possible en Italie par la conservation exceptionnellement précoce des archives d’écrivain, était devenue un outil pédagogique d’apprentissage de l’écriture et de la langue. En l’absence d’une norme linguistique unique (que seul un pouvoir politique centralisé aurait pu imposer), on tente en effet de la dégager des usages des grands écrivains, dont les manuscrits autographes garantissent l’authenticité. L’exception italienne prend fin quand se concrétise l’unification politique de la péninsule et que s’impose la nécessité d’une langue littéraire vivante, capable d’exprimer la totalité des besoins d’une nation moderne.
The long-term spatiotemporal variability of sea surface temperature in the northwest Pacific and China offshore
Authors: Wu Zhiyuan , Jiang Changbo , Conde Mack , Chen Jie , Deng Bin 
Published: January 2020

Abstract. The variability of the sea surface temperature (SST) in
the northwest Pacific has been studied on seasonal, annual and interannual
scales based on the monthly datasets of extended reconstructed
sea surface temperature (ERSST) 3b (1854–2017, 164 years) and
optimum interpolation sea surface temperature version 2 (OISST V2 (1988–2017,
30 years). The overall trends, spatial–temporal
distribution characteristics, regional differences in seasonal trends and
seasonal differences of SST in the northwest Pacific have been calculated
over the past 164 years based on these datasets. In the past 164 years, the
SST in the northwest Pacific has been increasing linearly year by year, with
a trend of 0.033 ∘C/10 years.
The SST during the period from 1870 to
1910 is slowly decreasing and staying in the range between 25.2
and 26.0 ∘C. During the period of 1910–1930, the SST as a whole
maintained a low value, which is at the minimum of 164 years. After
1930, SST continued to increase until now. The increasing trend in the
past 30 years has reached 0.132 ∘C/10 years, and the increasing trend
in the past 10 years is 0.306 ∘C/10 years, which is around 10 times that of
the past 164 years. The SST in most regions of the northwest Pacific
showed a linear increasing trend year by year, and the increasing trend in
the offshore region was stronger than that in the ocean and deep-sea region.
The change in trend of the SST in the northwest Pacific shows a large
seasonal difference, and the increasing trend in autumn and winter is larger
than that in spring and summer. There are some correlations between the SST
and some climate indices and atmospheric parameters; the correlations between
the SST and some atmospheric parameters have been discussed, such as those of the North Atlantic
Oscillation (NAO), Pacific Decadal Oscillation (PDO), Southern
Oscillation Index (SOI) anomaly, total column
water (TCW), NINO3.4 index, sea level pressure (SLP), precipitation, temperature at 2 m (T2) and wind speed. The
lowest SST in China offshore basically occurred in February and the
highest in August. The SST fluctuation in the Bohai Sea and Yellow Sea (BYS)
is the largest, with a range from 5 to 22 ∘C; the
SST in the East China Sea (ECS) is from 18 to 27 ∘C; the smallest
fluctuations occur in the South China Sea (SCS), maintained
at range of 26 to 29 ∘C. There are large
differences between the mean and standard deviation in different sea
regions.
Shear modulus Gs
Authors: Hughes D. K. 
Published: January 2020

A study group of the New Zealand National Society for Earthquake Engineering has recently completed recommendations for the seismic design of storage tanks in a form suitable for use as a code.
A knowledge of site response is an integral part of seismic analysis, unfortunately providing guidelines on assigning relevant soil parameters (shear modulus and damping in particular) cannot easily be resolved in a code format. However, as shear modulus (Gs) is referred to directly in the recommendations, it was decided to provide this technical note to enable some guidelines for its assessment to be given. It is an involved problem which requires a great deal of judgment on the designer's behalf if a realistic value of Gs is to be attained.
Most available data on Gs has been developed for either sands or saturated clays although there has been a limited amount of work done on gravelly soils. Because most soils have curvilinear stress-strain relationships, it will be appreciated that the shear modulus is not constant but is usually expressed as the secant modulus determined for a specific value of shear strain.
New Zealand earthquakes in 1989
Authors: Smith Warwick D. 
Published: January 2020

During 1989 the Seismological Observatory recorded and analysed 9892 earthquakes in the New Zealand region. Preliminary locations and magnitudes are now available for all these events. This is about five times the number usually analysed in previous years, thanks to the new digital recording equipment which is being installed throughout the country.
No earthquakes reached magnitude 6 during the year, although one of magnitude 5.9 in Fiordland was close to that figure. This caused intensity MM VI throughout Fiordland, and lower  intensities elsewhere in the southern half of the South Island. Earthquakes of magnitude 5 and greater are listed: they indicate an ongoing level of activity commensurate with New Zealand's seismic history and geographic location.
Reconnaissance field investigation of the Landers earthquake (Ms 7.5) of June 28, 1992,  San Bernadino County, California, USA
Authors: Berryman Kelvin 
Published: January 2020

The Landers earthquake (Ms 7.5) occurred at 4.58 am local time, and was located about 10 km north of the town of Yucca Valley, close to the small town of Landers, and about 170 km ENE of Los Angeles (Fig. 1). At the time the author was in Reno, Nevada, involved in a field study of the 1915 rupture of the Pleasant Valley fault. Fieldwork was completed on July 8, and on July 9 the author drove with a Reno-based colleague, Dr. Steven Wesnousky, firstly to Los Angeles to consult with seismologists and geologists at U. S. Geological Survey (Pasadena) and California Institute of Technology (Caltech), and then to Yucca Valley to inspect surface faulting and damage in the epicentral area. We reached Yucca Valley at about 6 pm on July 10, and remained in the area until the evening of July 14.
Some objectives in inspecting the fault rupture were to look at the distribution of slip along the length of the fault break; the relationship of faulting to pre-existing traces; and the relationship of the fault rupture to the total length of each of the faults that ruptured. The earthquake magnitude and total rupture length are similar to what has been proposed for the segment of the Wellington fault that runs through the Wellington metropolitan area.
Strengthening of the Wellington Town Hall
Authors: Jury R. D. 
Published: January 2020

The 'old' Wellington Town Hall has been refurbished and strengthened for earthquakes as part of the Wellington Civic Centre Development. The design outlined made maximum use of the existing brickwalls as shear walls and ensured that a load path was provided between all parts of the building and these. Careful sequencing of the demolition and construction works minimised the extent of temporary support works. In this manner a cost effective solution was achieved which enabled the entire project to be completed within a twelve month period in time for the 1992 International Arts Festival.
This paper describes aspects of the design and construction of the project.
A note on the Arthur's Pass earthquake 18 June 1994
Authors: Berrill J. B. , McManus K. J. , Clarke G. H. 
Published: January 2020

The M6.3, 18 June 1994 Arthur's Pass earthquake was notable for the strength of shaking recorded at Arthur's Pass Township and for the little damage it caused to bridges and houses. Bridges, the only major man-made structures in the epicentral region except the rail tunnel, survived with only superficial damage, probably because of their dense foundation soils.
An accelerogram recorded at the Pass township exceeds the current design motions by about 40 percent in the 0 to 0.5 second band.