bluuebunny/crossref_metadata_2025_split huggingface dataset:
A dual Ramsey theorem for finite ordered oriented graphs
Authors: Mašulović Dragan , Pantić Bojana 
Published: July 2019

Abstract
In contrast to the abundance of “direct” Ramsey results for classes of finite structures (such as finite ordered graphs, finite ordered metric spaces and finite posets with a linear extension), in only a handful of cases we have a meaningful dual Ramsey result. In this paper we prove a dual Ramsey theorem for finite ordered oriented graphs. Instead of embeddings, which are crucial for “direct” Ramsey results, we consider a special class of surjective homomorphisms between finite ordered oriented graphs. Since the setting we are interested in involves both structures and morphisms, all our results are spelled out using the reinterpretation of the (dual) Ramsey property in the language of category theory.
On EMV-Semirings
Authors: Borzooei R. A. , Shenavaei M. , Di Nola A. , Zahiri O. 
Published: July 2019

Abstract
The paper deals with an algebraic extension of MV-semirings based on the definition of generalized Boolean algebras. We propose a semiring-theoretic approach to EMV-algebras based on the connections between such algebras and idempotent semirings. We introduce a new algebraic structure, not necessarily with a top element, which is called an EMV-semiring and we get some examples and basic properties of EMV-semiring. We show that every EMV-semiring is an EMV-algebra and every EMV-semiring contains an MV-semiring and an MV-algebra. Then, we study EMV-semiring as a lattice and prove that any EMV-semiring is a distributive lattice. Moreover, we define an EMV-semiring homomorphism and show that the categories of EMV-semirings and the category of EMV-algebras are isomorphic. We also define the concepts of GI
-simple and DLO-semiring and prove that every EMV-semiring is a GI
-simple and a DLO-semiring. Finally, we propose a representation for EMV-semirings, which proves that any EMV-semiring is either an MV-semiring or can be embedded into an MV-semiring as a maximal ideal.
A nonsymmetrical matrix and its factorizations
Authors: Arikan Talha , Kiliç Emrah , Prodinger Helmut 
Published: July 2019

Abstract
We introduce a nonsymmetric matrix defined by q-integers. Explicit formulæ are derived for its LU-decomposition, the inverse matrices L
−1 and U
−1 and its inverse. Nonsymmetric variants of the Filbert and Lilbert matrices come out as consequences of our results for special choices of q and parameters. The approach consists of guessing the relevant quantities and proving them later by traditional means.
On weakly 𝓗-permutable subgroups of finite groups
Authors: Cao Chenchen , Amjid Venus , Zhang Chi 
Published: July 2019

Abstract
Let σ = {σi
∣i ∈ I} be some partition of the set of all primes ℙ, G be a finite group and σ(G) = {σi
∣σi
∩ π(G) ≠ ∅}. G is said to be σ-primary if ∣σ(G)∣ ≤ 1. A subgroup H of G is said to be σ-subnormal in G if there exists a subgroup chain H = H
0 ≤ H
1 ≤ … ≤ Ht
= G such that either H

i−1 is normal in Hi
or Hi
/(H

i−1)
Hi

is σ-primary for all i = 1, …, t. A set 𝓗 of subgroups of G is said to be a complete Hall
σ-set of G if every non-identity member of 𝓗 is a Hall σi
-subgroup of G for some i and 𝓗 contains exactly one Hall σi
-subgroup of G for every σi
∈ σ(G). Let 𝓗 be a complete Hall σ-set of G. A subgroup H of G is said to be 𝓗-permutable if HA = AH for all A ∈ 𝓗. We say that a subgroup H of G is weakly 𝓗-permutable in G if there exists a σ-subnormal subgroup T of G such that G = HT and H ∩ T ≤ H
𝓗, where H
𝓗 is the subgroup of H generated by all those subgroups of H which are 𝓗-permutable.
By using the weakly 𝓗-permutable subgroups, we establish some new criteria for a group G to be σ-soluble and supersoluble, and we also give the conditions under which a normal subgroup of G is hypercyclically embedded.
A geometrical version of Hardy-Rellich type inequalities
Authors: Nasibullin Ramil 
Published: July 2019

Abstract
We obtained a version of Hardy-Rellich type inequality in a domain Ω ∈ ℝ
n
which involves the distance to the boundary, the diameter and the volume of Ω. Weight functions in the inequalities depend on the “mean-distance” function and on the distance function to the boundary of Ω. The proved inequalities connect function to first and second order derivatives.
Uniqueness of meromorphic functions sharing four small functions on annuli
Authors: Meng Da Wei , Liu San Yang , Lu Nan 
Published: July 2019

AbstractUnder a certain condition, we propose a uniqueness theorem about meromorphic functions sharing four distinct small functions on an annulus. Two counter examples are given in order to show the certain condition is necessary. Our results generalize or improve the previous theorems due to T. B. Cao et al. and N. Wu et al.
A subclass of uniformly convex functions and a corresponding subclass of starlike function with fixed coefficient associated with q-analogue of Ruscheweyh operator
Authors: Khan Shahid , Hussain Saqib , Zaighum Muhammad A. , Darus Maslina 
Published: July 2019

Abstract
Making use of Ruscheweyh q-differential operator, we define a new subclass of uniformly convex functions and corresponding subclass of starlike functions with negative coefficients. The main object of this paper is to obtain, coefficient estimates, closure theorems and extreme point for the functions belonging to this new class. The results are generalized to families with fixed finitely many coefficients.
Oscillatory criteria for the second order linear ordinary differential equations
Authors: Grigorian Gevorg A. 
Published: July 2019

Abstract
The Riccati equation method is used to establish three new oscillatory criteria for the second order linear ordinary differential equations. We show that the first of these criteria in the continuous case of the coefficient function (potential) of the equation implies the J. Deng’s oscillatory criterion. An extremal oscillatory condition for the Mathieu’s equation is obtained. The obtained results are compared with some known oscillatory criteria.
When deviation happens between rough statistical convergence and rough weighted statistical convergence
Authors: Ghosal Sanjoy , Ghosh Avishek 
Published: July 2019

AbstractIn this paper we introduce rough weighted statistical limit set and weighted statistical cluster points set which are natural generalizations of rough statistical limit set and statistical cluster points set of double sequences respectively. Some new examples are constructed to ensure the deviation of basic results. Both the sets don’t follow the usual extension properties which will be discussed here.
On sequence spaces generated by binomial difference operator of fractional order
Authors: Yaying Taja , Hazarika Bipan 
Published: July 2019

Abstract
In this article we introduce binomial difference sequence spaces of fractional order α,

b
p

r
,
s

$\begin{array}{}
b_p^{r,s}
\end{array}$

(Δ(α)) (1 ≤ p ≤ ∞) by the composition of binomial matrix, B

r,s
and fractional difference operator Δ(α), defined by (Δ(α)
x)
k
=

∑

i
=
0

∞

(
−
1

)
i

Γ
(
α
+
1
)

i
!
Γ
(
α
−
i
+
1
)

x

k
−
i

$\begin{array}{}
\displaystyle
\sum\limits_{i=0}^{\infty}(-1)^i\frac{\Gamma(\alpha+1)}{i!\Gamma(\alpha-i+1)}x_{k-i}
\end{array}$

. We give some topological properties, obtain the Schauder basis and determine the α, β and γ-duals of the spaces. We characterize the matrix classes (

b
p

r
,
s

$\begin{array}{}
b_p^{r,s}
\end{array}$

(Δ(α)), Y), where Y ∈ {ℓ
∞, c, c
0, ℓ
1} and certain classes of compact operators on the space

b
p

r
,
s

$\begin{array}{}
b_p^{r,s}
\end{array}$

(Δ(α)) using Hausdorff measure of non-compactness. Finally, we give some geometric properties of the space

b
p

r
,
s

$\begin{array}{}
b_p^{r,s}
\end{array}$

(Δ(α)) (1 < p < ∞).
On the Gromov-Hausdorff limit of metric spaces
Authors: Wu Zhijuan , Xiao Yingqing 
Published: July 2019

Abstract
In this paper, we show that a class of metric spaces determined by a continuous function f, which defines on the metric space of all real, n × n-matrices m is closed under the Gromov-Hausdorff convergence. This conclusion can be used to prove some metric properties of metric space is stable under the Gromov-Hausdorff convergence. Secondly, we consider the stability problem in Gromov hyperbolic space and show that if a sequence of Gromov hyperbolic spaces (Xn
, dn
) is said to converge to (X, d) in the sense of Gromov-Hausdorff convergence, then the Gromov hyperbolicity δ(Xn
) of (Xn
, dn
) tends to the Gromov hyperbolicity δ(X) of (X, d).
The beta exponentiated Nadarajah-Haghighi distribution: theory, regression model and application
Authors: Saboor Abdus , Khan Muhammad Nauman , Cordeiro Gauss M. , Elbatal Ibrahim , Pescim Rodrigo R. 
Published: July 2019

Abstract
We introduce and study the beta exponentiated Nadarajah-Haghighi model, which has increasing, decreasing, upside-down bathtub and bathtub shaped hazard functions. Some of its mathematical properties are determined including a power series for the quantile function. We perform a Monte Carlo simulation study to assess the finite sample behavior of the maximum likelihood estimates of the parameters. We define a new regression model based on the new distribution. The potentiality of this regression model is proved empirically by means of a real dataset related to diabetic retinopathy study.
Photonic analogues of the Haldane and Kane-Mele models
Authors: Lannebère Sylvain , Silveirinha Mário G. 
Published: July 2019

Abstract
The condensed matter Haldane and Kane-Mele models revolutionized the understanding of what is an “insulator,” as they unveiled novel classes of media that behave as metals near the surface, but are insulating in the bulk. Here, we propose exact electromagnetic analogues of these two influential models relying on a photonic crystal implementation of “artificial graphene” subject to an effective magnetic field. For the Haldane model, the required effective magnetic field for photons can be emulated with a spatially variable pseudo-Tellegen response. For the Kane-Mele model, the spin-orbit coupling can be mimicked using matched anisotropic dielectrics with identical permittivity and permeability, without requiring any form of bianisotropic couplings. Using full-wave numerical simulations and duality theory we verify that the nontrivial topology of the two proposed platforms results in the emergence of topologically protected gapless edge states at the interface with a trivial photonic insulator. Our theory paves the way for the emulation of the two condensed matter models in a photonic platform and determines another paradigm to observe topologically protected edge states in a fully reciprocal all-dielectric and non-uniform anisotropic metamaterial.
Topologically protected broadband rerouting of propagating waves around complex objects
Authors: Hayran Zeki , Hassani Gangaraj Seyyed Ali , Monticone Francesco 
Published: July 2019

Abstract
Achieving robust propagation and guiding of electromagnetic waves through complex and disordered structures is a major goal of modern photonics research, for both classical and quantum applications. Although the realization of backscattering-free and disorder-immune guided waves has recently become possible through various photonic schemes inspired by topological insulators in condensed matter physics, the interaction between such topologically protected guided waves and free-space propagating waves remains mostly unexplored, especially in the context of scattering systems. Here, we theoretically demonstrate that free-space propagating plane waves can be efficiently coupled into topological one-way surface waves, which can seamlessly flow around sharp corners and electrically large barriers and release their energy back into free space in the form of leaky-wave radiation. We exploit this physical mechanism to realize topologically protected wave-rerouting around an electrically large impenetrable object of complex shape, with transmission efficiency exceeding 90%, over a relatively broad bandwidth. The proposed topological wave-rerouting scheme is based on a stratified structure composed of a topologically nontrivial magnetized plasmonic material coated by a suitable isotropic layer. Our results may open a new avenue in the field of topological photonics and electromagnetics, for applications that require engineered interactions between guided waves and free-space propagating waves, including for complex beam-routing systems and advanced stealth technology. More generally, our work may pave the way for robust defect/damage-immune scattering and radiating systems.
Perovskite nanocrystals for energy conversion and storage
Authors: Kostopoulou Athanasia , Brintakis Konstantinos , Nasikas Nektarios K. , Stratakis Emmanuel 
Published: July 2019

AbstractThe high demand for energy consumption in everyday life, and fears of climate change are driving the scientific community to explore prospective materials for efficient energy conversion and storage. Perovskites, a prominent category of materials, including metal halides and perovskite oxides have a significant role as energy materials, and can effectively replace conventional materials. The simultaneous need for new energy materials together with the increased interest for making new devices, and exploring new physics, thrust the research to control the structuring of the perovskite materials at the nanoscale. Nanostructuring of the perovskites offers unique features such as a large surface area, extensive porous structures, controlled transport and charge-carrier mobility, strong absorption and photoluminescence, and confinement effects. These features together with the unique tunability in their composition, shape, and functionalities make perovskite nanocrystals efficient for energy-related applications such as photovoltaics, catalysts, thermoelectrics, batteries, supercapacitor and hydrogen storage systems. The synthesis procedures of perovskite nanostructures in different morphologies is summarized and the energy-related properties and applications are extensively discussed in this paper.
The fine structure of the neutral nitrogen-vacancy center in diamond
Authors: Barson Michael S.J. , Krausz Elmars , Manson Neil B. , Doherty Marcus W. 
Published: July 2019

Abstract
The nitrogen-vacancy (NV) center in diamond is a widely utilized system due to its useful quantum properties. Almost all research focuses on the negative charge state (NV−) and comparatively little is understood about the neutral charge state (NV0). This is surprising as the charge state often fluctuates between NV0 and NV− during measurements. There are potentially under-utilized technical applications that could take advantage of NV0, either by improving the performance of NV0 or utilizing NV− directly. However, the fine structure of NV0 has not been observed. Here, we rectify this lack of knowledge by performing magnetic circular dichroism measurements that quantitatively determine the fine structure of NV0. The observed behavior is accurately described by spin-Hamiltonians in the ground and excited states with the ground state yielding a spin-orbit coupling of λ = 2.24 ± 0.05 GHz and a orbital g-factor of 0.0186 ± 0.0005. The reasons why this fine structure has not been previously measured are discussed and strain-broadening is concluded to be the likely reason.
Synthesis and crystal structure of a new polymorph of diisopropylammonium trichloroacetate, C8H16Cl3NO2
Authors: Reiss Guido J. , Meyer Michaela K. , Graf Jürgen 
Published: July 2019

Abstract
C8H16Cl3NO2, monoclinic, P21 (no. 4), a = 9.1804(5), Å, b = 19.4133(10) Å, c = 13.9191(7) Å, β = 90.593(3)°, V = 2480.6(2) Å3, Z = 8, R
gt(F) = 0.0605, wR
ref(F
2) = 0.1387, T = 296(2) K.
Crystal structure of (E)-2-(3,6-bis(ethylamino)-2,7-dimethyl-9H-xanthen-9-yl)-N′-((6-methylpyridin-2-yl)methylene)benzohydrazide – methanol (1/1), C34H37N5O3
Authors: Yuan Juan 
Published: July 2019

Abstract
C34H37N5O3, triclinic, P1̄ (no. 2), a = 8.9446(3) Å, b = 13.4223(4) Å, c = 13.4559(4) Å, α = 83.371(3)°, β = 71.724(3)°, γ = 75.383(3)°, Z = 2, V = 1483.18(9) Å3, R
gt(F) = 0.0383, wR
ref(F
2) = 0.0981, T = 105.6(5) K.
Crystal structure of poly[(μ3-9H-carbazole-3,6-dicarboxylato-κ3
O
1: O
2: O
3)(μ2-4-(pyridin-4-yl)pyridine-κ2
N
1:N
1′)zinc(II)], C19H11N2O4Zn
Authors: Wang Daguang , Li Wei , Sun Yabin 
Published: July 2019

Abstract
C19H11N2O4Zn, monoclinic, C2/c (no. 15), a = 21.645(3) Å, b = 11.4467(18) Å, c = 12.985(2) Å, β = 103.156(3)°, Z = 8, V = 3132.8(8) Å3, R
gt(F) = 0.0436, wR
ref(F
2) = 0.1193, T = 172(2) K.
Crystal structure of discandium triruthenium tetrasilicide, Sc2Ru3Si4
Authors: Ibuka Soshi , Matsushita Yoshitaka , Imai Motoharu 
Published: July 2019

Abstract
Sc2Ru3Si4, monoclinic, C2/c (no. 15), a = 19.0663(5) Å, b = 5.27810(10) Å, c = 13.3458(4) Å, β = 127.7710(10)°, V = 1061.62(5) Å3, Z = 8, R
gt(F) = 0.0209, wR
ref(F
2) = 0.0530, T = 293(2) K.
The crystal structure of 1,2-bis(3-bromophenoxy) ethane, C14H12Br2O2
Authors: Teng Ming-Gang , Qin Yu-Mei , Long Dan , Cao Jian-Xin , Zhao Chun-Shen 
Published: July 2019

Abstract
C14H12Br2O2, monoclinic, C2/c (no. 15), a = 27.323(3) Å, b = 5.8516(6) Å, c = 8.9145(10) Å, β = 103.596(3)°, V = 1385.4(3) Å3, Z = 4, R
gt(F) = 0.0378, wR
ref(F
2) = 0.1019, T = 296(2) K.
Community Health Centers (CHCs) Under Environmental Uncertainty: An Examination of the Affordable Care Act of 2010 and Early Medicaid Expansion on CHC Margin
Authors: Lam Marcus , Grasse Nathan 
Published: July 2019

AbstractNonprofit community health centers (CHCs) are the largest subset of safety net clinics in the United States and, in many vulnerable and underserved areas, act as the only provider of vital health services in the community. The expansion of Medicaid provision under the Affordable Care Act of 2010 led to a fundamental change in the core client demographics of CHCs, with higher income thresholds and single childless individuals now eligible for Medicaid. This expansion of the Medicaid population creates both opportunities and threats that may impact CHCs’ long term financial sustainability. Accumulating reserves through positive net margins is a managerial tactic that nonprofits can utilize to buffer against environmental uncertainty. This study utilizes data from IRS Form 990s, American Community Survey, HRSA grantee lists, and the Area Resource File to model the differences in net margins between CHCs in early Medicaid expansion and non-expansion states from 2008–2012. Results show higher margins for CHCs in early expansion states compared to non-expansion states, even after accounting for organizational and environmental covariates. CHCs who are HRSA grantees are associated with positive margins whereas those relying more heavily on program revenue show negative margins. Further, CHCs located in counties with higher percentages of persons in poverty also demonstrate reduced margins. This exploratory study contributes to the nonprofit finance literature by highlighting the importance of incorporating contextual variables to deepen our understanding of changes in nonprofit financial health.
Spectral and thermal data as a proxy for leaf protective energy dissipation under kaolin application in grapevine cultivars
Authors: Tosin Renan , Pôças Isabel , Cunha Mário 
Published: July 2019

AbstractThe dynamic effects of kaolin clay particle film application on the temperature and spectral reflectance of leaves of two autochthonous cultivars (Touriga Nacional (TN, n=32) and Touriga Franca (TF, n=24)) were studied in the Douro wine region. The study was implemented in 2017, in conditions prone to multiple environmental stresses that include excessive light and temperature as well as water shortage. Light reflectance from kaolin-sprayed leaves was higher than the control (leaves without kaolin) on all dates. Kaolin’s protective effect over leaves’ temperatures was low on the 20 days after application and ceased about 60 days after its application. Differences between leaves with and without kaolin were explained by the normalized maximum leaf temperature (T_max_f_N), reflectance at 400 nm, 532 nm, and 737 nm, as assessed through TN data. The wavelengths of 532 nm and 737 nm are associated with plant physiological processes, which support the selection of these variables for assessing kaolin’s effects on leaves. The application of principal component analysis to the TF data, based on these four variables (T_max_f_N and reflectances: 400, 532, 737 nm) selected for TN, explained 83.56% of data variability (considering two principal components), obtaining a clear differentiation between leaves with and without kaolin. The T_max_f_N and the reflectance at 532 nm were the variables with a greater contribution for explaining data variability. The results improve the understanding of the vines’ response to kaolin throughout the grapevine cycle and support decisions about the re-application timing.
MACHoice: a Decision Support System for agricultural machinery management
Authors: Cunha M. , Gonçalves S.G. 
Published: July 2019

Abstract
Mechanisation is a key input in modern agriculture, while it accounts for a large part of crop production costs, it can bring considerable farm benefits if well managed. Models for simulated machinery costs, may not replace actual cost measurements but the information obtained through them can replace a farm’s existing records, becoming more valuable to decision makers. MACHoice, a decision support system (DSS) presented in this paper, is a farm machinery cost estimator and break-even analyzer of alternatives for agricultural operations, developed using user-driven expectations and in close collaboration with agronomists and computer engineers. It integrates an innovative algorithm developed for projections of machinery costs under different rates of annual machine use and work capacity processing, which is crucial to decisions on break-even machinery alternatives. A case study based on the comparison of multiple alternatives for grape harvesting operations is presented to demonstrate the typical results that can be expected from MACHoice, and to identify its capabilities and limitations. This DSS offers an integrated and flexible analysis environment with a user-friendly graphical interface as well as a high level of automation of processing chains. The DSS-output consists of charts and tables, evidencing the differences related to costs and carbon emissions between the options inserted by the user for the different intensity of yearly work proceeded. MACHoice is an interactive web-based tool that can be accessed freely for non-commercial use by every known browser.
Effect of salinity on the morphological, physiological and biochemical properties of lettuce (Lactuca sativa L.) in Bangladesh
Authors: Ahmed Sium , Ahmed Shawon , Roy Swapan Kumar , Woo Sun Hee , Sonawane Kailas Dashrath , Shohael Abdullah Mohammad 
Published: July 2019

Abstract
This study aimed to explore the changes in morphological, physiological and biochemical characteristics of lettuce (Lactuca sativa L.) in response to salt stress when grown using hydroponic techniques. The seedlings were subjected to five different concentrations (0 mM, 50 mM, 100 mM, 150 mM, and 200 mM) of NaCl for three weeks. During the salt stress, morphological properties (shoot length, root length, total plant weight, leaf number) were measured in every week. After 21 days of salt stress, physiological properties (water content and relative water content) and biochemical properties (proline, protein, phenol, reducing and non-reducing sugar content) were measured. Morphological and physiological properties were found decreased gradually with increasing salt concentrations. Biochemical properties such as proline and protein content increased remarkably, and total phenol content decreased gradually with increasing salt concentrations. Reducing sugar accumulation was higher in all treatments except 50 mM in comparison to control. Non-reducing sugar accumulation was decreased in 100 mM and 200 mM treatment, similar in 150 mM treatment, and increased in 50 mM treatment when compared to control. These findings render lettuce a salt-sensitive plant at higher salt concentration. However, changes in characteristics were realistic up to 50 mM salt concentration.