bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis and Modeling of Enterprise Competitive Intelligence Based on Social Media User Comments
Authors: Ding Jian-lan , Shi Bing
Published: January 2021

Under modern information conditions, competitive intelligence has an important strategic role for an enterprise to reduce market, financial and other risks. How to correctly evaluate the value of competitive intelligence and make the right decision for an enterprise directly determines the survival and development of an enterprise. By establishing a co-occurrence relationship between the two, the core themes of corporate microblog communication are discovered. Proceeding from the basic theory of the value of competitive intelligence, it is proposed that due to the connection of business departments within the enterprise system, the transfer value of competitive intelligence within the enterprise system is changed, and a mathematical analysis method is used to establish a value transfer analysis model. The value-added process of enterprise competitive intelligence and the internal and external operational processes of the enterprise are unified, and the internal and external competitive intelligence value-added operation modes of enterprises led by different strategies are studied. This provides a new and widely-referenced operational reference for different companies to effectively formulate and implement their competition and cooperation strategies through internal and external competitive intelligence operations.
Quantum modularity of partial theta series with periodic coefficients
Authors: Goswami Ankush , Osburn Robert
Published: January 2021

We explicitly prove the quantum modularity of partial theta series with even or odd periodic coefficients.
As an application, we show that the Kontsevich–Zagier series

ℱ
t

⁢

(
q
)

{\mathscr{F}_{t}(q)}

which matches (at a root of unity) the colored Jones polynomial for the family of torus knots

T
⁢

(
3
,

2
t

)

{T(3,2^{t})}

,

t
≥
2

{t\geq 2}

, is a weight

3
2

{\frac{3}{2}}

quantum modular form.
This generalizes Zagier’s result on the quantum modularity for the “strange” series

F
⁢

(
q
)

{F(q)}

.
Spatiotemporal change of land use for deceased in Beijing since the mid-twentieth century
Authors: Doi Haruhiro , Chai Yanwei , Xu Peiwei , Wang Xinxing
Published: January 2021

The land use for the deceased is not only for the dead but also for the living relatives. It competes with land use for living populations in urban areas through occupying a specific space of land. This article looks at this shared interest in humankind by mapping the land use for the deceased in the mid-twentieth century and modern Beijing and address the sustainability of future land use for dead in Beijing. Specifically, it clarifies the change of its area and location in the urban–regional structure and also considers the background factors. In the 1930s, the spatial distribution of cemeteries in the mid-twentieth century was mapped using the old topographic maps and also mainly using city government materials for modern times. A comparison of land use between the two periods shows that the spatial land use for the deceased continues to be the characteristics of traditional funeral values, Feng Shui philosophy, spatial separation of the dead, and the population, such as public cemeteries surrounding the built-up area. The city government reduced the pressure on land resources by encouraging land-saving burial such as undersea burial, which affects the value of funerals for citizens, resulting in an area of cemetery per urban population.
The commodification of personality: Human enhancement and market society
Authors: Gaitán Leandro
Published: January 2021

In a future highly technological society it will be possible to modify the personality using different kinds of technological tools. Consequently, we could become buyers and consumers of personality. As such, personality, which is a core aspect of the self, could turn into a commodity. This article intends to address the following questions: 1) How can new technologies modify personality? 2) Why might personality become a commodity? 3) What is wrong with turning personality into commodity?
Explaining Review-Based Recommendations: Effects of Profile Transparency, Presentation Style and User Characteristics
Authors: Hernandez-Bocanegra Diana C. , Ziegler Jürgen
Published: January 2021

Providing explanations based on user reviews in recommender systems (RS) may increase users’ perception of transparency or effectiveness. However, little is known about how these explanations should be presented to users, or which types of user interface components should be included in explanations, in order to increase both their comprehensibility and acceptance. To investigate such matters, we conducted two experiments and evaluated the differences in users’ perception when providing information about their own profiles, in addition to a summarized view on the opinions of other customers about the recommended hotel. Additionally, we also aimed to test the effect of different display styles (bar chart and table) on the perception of review-based explanations for recommended hotels, as well as how useful users find different explanatory interface components. Our results suggest that the perception of an RS and its explanations given profile transparency and different presentation styles, may vary depending on individual differences on user characteristics, such as decision-making styles, social awareness, or visualization familiarity.
When does the driver feel ready to drive again after automated driving? – A qualitative approach
Authors: Scatturin Lara , Erbach Rainer , Baumann Martin
Published: January 2021

In automated driving, getting ready to drive after a take-over is one of the most crucial topics. Whereas previous research mainly focuses on behavioral data, little is known about the driver’s experience. In this simulator study, the participants are asked retrospectively when they felt ready to drive again after the take-over. The results suggest that driver availability is a subjectively and situationally influenced concept determined by motoric, temporal, visual, or cognitive factors. Identifying the relevant factors contributes to the development of tailored support during the transition.
Das Institut für Informationswissenschaft an der Universität Graz: 1987 – 2020
Authors: Reichmann Gerhard , Schlögl Christian , Thalmann Stefan
Published: January 2021

Die Geschichte des Instituts für Informationswissenschaft an der Universität Graz in Österreich von seiner Gründung 1987 bis zur Fusionierung mit anderen Instituten im Jahr 2020 wird beschrieben und mit Daten aus bibliometrischen Analysen der Publikationen ergänzt. Abschließend wird ein Ausblick auf die Einbindung der Informationswissenschaft in neue Studienangebote gegeben.
A piezoelectric contact problem with slip dependent friction and damage
Authors: Kasri Abderrezak
Published: January 2021

The aim of this paper is to study a quasistatic contact problem between an
electro-elastic viscoplastic body with damage and an electrically conductive
foundation. The contact is modelled with an electrical condition, normal
compliance and the associated version of Coulomb’s law of dry friction in
which slip dependent friction is included. We derive a variational
formulation for the model and, under a smallness assumption, we prove the
existence and uniqueness of a weak solution.
Odd order products of conjugate involutions in linear groups over GF(2𝑎)
Authors: Ballantyne John J. , Rowley Peter J.
Published: January 2021

LetGbe isomorphic toGLn⁢(q){\mathrm{GL}_{n}(q)},SLn⁢(q){\mathrm{SL}_{n}(q)},PGLn⁢(q){\mathrm{PGL}_{n}(q)}orPSLn⁢(q){\mathrm{PSL}_{n}(q)}, whereq=2a{q=2^{a}}. Iftis an involution lying in aG-conjugacy classX, then, for arbitraryn, we show that, asqbecomes large, the proportion of elements ofXwhich have odd order product withttends to 1. Furthermore, fornat most 4, we give formulae for the number of elements inXwhich have odd order product witht, in terms ofq.
New Lie products for groups and their automorphisms
Authors: Wilson James B.
Published: January 2021

We generalize the common notion of descending and ascending central series.
The descending approach determines a naturally graded Lie ring and the ascending version determines a graded module for this ring.
We also link derivations of these rings to the automorphisms of a group.
This process uncovers new structure in 4/5 of the approximately 11.8 million groups of size at most 1000 and beyond that point pertains to at least a positive logarithmic proportion of all finite groups.
A posteriori choice of time-discretization step in finite difference methods for solving ill-posed Cauchy problems in Hilbert space
Authors: Kokurin Mikhail M.
Published: January 2021

Finite difference semidiscretization methods for solving an ill-posed Cauchy problem in a Hilbert space are investigated. The problems involve linear positively definite selfadjoint operators. We justify an a posteriori scheme for the choice of the time-discretization step and establish accuracy estimates in terms of the error level of input data.
Guided image filtering based ℓ0 gradient minimization for limited-angle CT image reconstruction
Authors: Wang Tianyi , Wang Chengxiang , Zhao Kequan , Yu Wei , Huang Min
Published: January 2021

Limited-angle computed tomography (CT)
reconstruction problem arises in some practical applications due to restrictions in the scanning environment or CT imaging device. Some artifacts will be presented in image reconstructed by conventional analytical algorithms. Although some regularization strategies have been proposed to suppress the artifacts, such as total variation (TV) minimization, there is still distortion in some edge portions of image. Guided image filtering (GIF) has the advantage of smoothing the image as well as preserving the edge. To further improve the image quality and protect the edge of image, we propose a coupling method, that combines

ℓ
0

{\ell_{0}}

gradient minimization and GIF. An intermediate result obtained by

ℓ
0

{\ell_{0}}

gradient minimization is regarded as a guidance image of GIF, then GIF is used to filter the result reconstructed by simultaneous algebraic reconstruction technique (SART) with nonnegative constraint. It should be stressed that the guidance image is dynamically updated as the iteration process, which can transfer the edge to the filtered image. Some simulation and real data experiments are used to evaluate the proposed method. Experimental results show that our method owns some advantages in suppressing the artifacts of limited angle CT and in preserving the edge of image.
The modulus of the Fourier transform on a sphere determines 3-dimensional convex polytopes
Authors: Engel Konrad , Laasch Bastian
Published: January 2021

Let 𝒫 and

P
′

\mathcal{P}^{\prime}

be 3-dimensional convex polytopes in

R
3

\mathbb{R}^{3}

and

S
⊆

R
3

S\subseteq\mathbb{R}^{3}

be a non-empty intersection of an open set with a sphere.
As a consequence of a somewhat more general result it is proved that 𝒫 and

P
′

\mathcal{P}^{\prime}

coincide up to translation and/or reflection in a point if

|

∫
P

e

-

i
⁢
s

⋅
x

⁢
dx

|

=

|

∫

P
′

e

-

i
⁢
s

⋅
x

⁢
dx

|

\bigl{\lvert}\int_{\mathcal{P}}e^{-i\mathbf{s}\cdot\mathbf{x}}\,\mathbf{dx}\bigr{\rvert}=\bigl{\lvert}\int_{\mathcal{P}^{\prime}}e^{-i\mathbf{s}\cdot\mathbf{x}}\,\mathbf{dx}\bigr{\rvert}

for all

s
∈
S

\mathbf{s}\in S

.
This can be applied to the field of crystallography regarding the question whether a nanoparticle modelled as a convex polytope is uniquely determined by the intensities of its X-ray diffraction pattern on the Ewald sphere.
Recovery of the time-dependent implied volatility of time fractional Black–Scholes equation using linearization technique
Authors: Iqbal Sajad , Wei Yujie
Published: January 2021

This paper tries to examine the recovery of the time-dependent implied volatility coefficient from market prices of options for the time fractional Black–Scholes equation (TFBSM) with double barriers option. We apply the linearization technique and transform the direct problem into an inverse source problem. Resultantly, we get a Volterra integral equation for the unknown linear functional, which is then solved by the regularization method. We use

L
1

{L_{1}}

-forward difference implicit approximation for the forward problem. Numerical results using

L
1

{L_{1}}

-forward difference implicit approximation (

L
1

{L_{1}}

-FDIA) for the inverse problem are also discussed briefly.
Inverse problems in analysis of input-output model in the class of CES functions
Authors: Shananin Alexander A. , Rassokha Anastasiya V.
Published: January 2021

The article proposes a modification of the approach to the analysis of inter-industry balance.
Instead of linear models of inter-industry balance, based on the hypothesis of W. Leontief about the constancy of the cost standards of production factors, the article studies nonlinear models.
For the case of production functions with constant elasticity of substitution (CES) an algorithm for solving the inverse problem is proposed, which allows to identify the model of nonlinear inter-industry balance based on the data of the symmetric input-output table.
Based on the Young transform and Fennel duality, with the help of this model, we develop a technology for analyzing inter-industry relationships.
The technology has been tested on the data of economic statistics of Russia.
Instance Reduction for Avoiding Overfitting in Decision Trees
Authors: Amro Asma’ , Al-Akhras Mousa , Hindi Khalil El , Habib Mohamed , Shawar Bayan Abu
Published: January 2021

Decision trees learning is one of the most practical classification methods in machine learning, which is used for approximating discrete-valued target functions. However, they may overfit the training data, which limits their ability to generalize to unseen instances. In this study, we investigated the use of instance reduction techniques to smooth the decision boundaries before training the decision trees. Noise filters such as ENN, RENN, and ALLKNN remove noisy instances while DROP3 and DROP5 may remove genuine instances. Extensive empirical experiments were conducted on 13 benchmark datasets from UCI machine learning repository with and without intentionally introduced noise. Empirical results show that eliminating border instances improves the classification accuracy of decision trees and reduces the tree size, which reduces the training and classification times. In datasets without intentionally added noise, applying noise filters without the use of the built-in Reduced Error Pruning gave the best classification accuracy. ENN, RENN, and ALLKNN outperformed decision trees learning without pruning in 9, 9, and 8 out of 13 datasets, respectively. The datasets reduced using ENN and RENN without built-in pruning were more effective when noise was intentionally introduced in different ratios.
Performance investigation of PM-based wavelength remodulation scheme in bidirectional TWDM-PON
Authors: Liu Changqing , Ding Qing-an , Song Juan , Zhang Lijun , Wang Xiaojuan , Nie Bowen , Li Chaofan , Cheng Xudong
Published: January 2021

Signal remodulation mechanism is a promising cost-effective choice for future optical access networks. This paper investigates the scheme of the phase modulator to remodulate upstream data in the bidirectional WDM PON and TWDM PON system. The simulation results of downstream is carried out using two data formats such as RZ and NRZ at varying lengths of single mode fibers in this scheme. In addition, the upstream transmission compares different remodulators such as Phase modulator, Mach–Zehnder modulator (MZM) and Electroabsorption modulator. By analyzing the eye diagram and Q-value, the performance of upstream and downstream transmission is obtained. It is observed that the PM remodulation TWDM-PON with NRZ modulation format has better performance, which is a rational solution for NG-PON2 cost-effectiveness.
The Behavior of Divorce Rates: A Smooth Transition Regression Approach
Authors: Korhonen Marko , Puhakka Mikko
Published: January 2021

We explore the behavior of the divorce rates in 17 OECD countries for the period 1960–2010. Many studies have found persistence in divorce rates after changes in divorce laws. We formulate a nonlinear model to explain the behavior of divorce rates, over time, after a large change in divorce rate, including changes in divorce laws.We argue that the stationary smooth transition regression (STR) approach is useful in analyzing divorce rates. We reject the persistence result and, in addition, provide evidence on asymmetries in divorce rates. This suggests that one should be careful when interpreting the effects of the changes in divorce rates (especially changes in the divorce and family laws) on divorce rates.
Predominance of Gram-negative infections a cause of neonatal sepsis among low birth weight preterm infants
Authors: Bai Xinlu , Wei Qiang , Duan Taimei , Yi Yuling , Peng Hong , Hu Liyi
Published: January 2021

Objectives

Neonatal sepsis continues to be a leading and most important cause of mortality among low birth weight (LBW) preterm infants.

Methods

The study group included 226 LBW preterm infants with sepsis. A total of 100 normal birth weight infants with sepsis served as control. Blood and cerebrospinal fluid (CSF) samples collected for microbiological culture and processed according to standard protocol. Antibiotic resistance patterns were performed following standard guidelines.

Results

Out of 226 LBW preterm infants 106 (46.9%) showed positive blood culture, of which 52 (49%) Escherichia coli, 28 (26.4%) Klebsiella pneumoniae, 12 (11.32%) Enterobacter spp., 4 (3.7%) Pseudomonas aeruginosa, 2 (1.88%) Acinetobacter spp., 5 (4.7%) methicillin-resistant Staphylococcus aureus (MRSA), 3 (2.8%) Staphylococcus epidermidis were isolated. Out of 100 control group infants, 46 (46%) showed positive blood cultures, of which 18 (39.1%) E. coli, 12 (26.08%) Enterobacter spp., 8 (17.39%) K. pneumoniae, 1 (2.17%) P. aeruginosa, 2 (4.34%) MRSA, 3 (6.52%) S. epidermidis and 2 (4.34%) Candida spp. were isolated. Cephalosporin and Penicillin group showed highest resistance with 58 and 52%, respectively. Aminoglycosides showed 22% resistance. The control group showed highest resistance of 62% to the Penicillin group, 54% cephalosporin and 18% for aminoglycosides.

Conclusions

Our study highlights on the surveillance of resistant pathogens causing sepsis in LBW preterm infants emphasizing antimicrobial stewardship to control the mortality rate.
Evaluating Public Library Events using a Combination of Methods
Authors: Pisanski Jan , Švab Katarina
Published: January 2021

Public libraries hold an increasing number of events, where they face the very important, but often neglected, challenge of evaluation. This paper presents various studies performed to evaluate events for adults at the largest public library in Slovenia, Mestna knjižnica Ljubljana (Ljubljana City Library). A combination of methods was used: content analysis of library website and promotional brochures, interviews with both attendees and librarians, observation of events and a relatively large survey. Additionally, based on this research, seven personas representing typical user groups of events for adults were developed. While attendees were generally highly satisfied with the existing events, our research found room for improvement, especially regarding planning for particular user groups, scheduling and topical diversity of events and promotion aimed at both existing and potential visitors. Based on this research, Ljubljana City Library prepared guidelines for their future events for adults. Additionally, the general outline of the evaluation should be of benefit to any library regardless of type, size or location.
Role-reference associations and the explanation of argument coding splits
Authors: Haspelmath Martin
Published: January 2021

Argument coding splits such as differential (= split) object marking and split ergative marking have long been known to be universal tendencies, but the generalizations have not been formulated in their full generality before. In particular, ditransitive constructions have rarely been taken into account, and scenario splits have often been treated separately. Here I argue that all these patterns can be understood in terms of the usual association of role rank (highly ranked A and R, low-ranked P and T) and referential prominence (locuphoric person, animacy, definiteness, etc.). At the most general level, the role-reference association universal says that deviations from usual associations of role rank and referential prominence tend to be coded by longer grammatical forms. In other words, A and R tend to be referentially prominent in language use, while P and T are less prominent, and when less usual associations need to be expressed, languages often require special coding by means of additional flags (case-markers and adpositions) or additional verbal voice coding (e.g., inverse or passive markers). I argue that role-reference associations are an instance of the even more general pattern of form-frequency correspondences, and that the resulting coding asymmetries can all be explained by frequency-based predictability and coding efficiency.
Thenice-of-youconstruction and its fragments
Authors: Goldberg Adele E. , Herbst Thomas
Published: January 2021

This article argues that a usage-based construction (a conventional pairing of form and function) is required to account for a certain pattern of English exemplified by e.g.,it’s nice of you to read this. Contemporary corpus and survey data reveal that the construction is strongly associated with certain adjectives (e.g.,nice, good) over others, while diachronic data demonstrate that the construction’s overall frequency has systematically waxed and waned over the past century. The construction’s unique function – namely to concisely convey a judgment regarding how an action reflects on the agent of the action – enables us to predict many observations about its distribution without stipulation. These include restrictions on the interpretation of adjectives that occur in the construction, its infinitive complement, the modal verbs that may appear in it and its ability to be embedded. We further observe that certain conventional fragments of the construction evoke the semantics of the entire construction. Finally, we situate the construction within a network of related constructions, as part of a speaker’s “construct-i-con”.
On the dependence structure and quality of scrambled (t, m, s)-nets
Authors: Wiart Jaspar , Lemieux Christiane , Dong Gracia Y.
Published: January 2021

In this paper we develop a framework to study the dependence structure of scrambled

(
t
,
m
,
s
)

{(t,m,s)}

-nets. It relies on values denoted by

C
b

⁢

(
𝒌
;

P
n

)

{C_{b}({\boldsymbol{k}};P_{n})}

, which are related to how many distinct pairs of points from

P
n

{P_{n}}

lie in the same elementary

𝒌

{{\boldsymbol{k}}}

-interval in base b. These values quantify the equidistribution properties of

P
n

{P_{n}}

in a more informative way than the parameter t. They also play a key role in determining if a scrambled set

P
~

n

{\widetilde{P}_{n}}

is negative lower orthant dependent (NLOD). Indeed, this property holds if and only if

C
b

⁢

(
𝒌
;

P
n

)

≤
1

{C_{b}({\boldsymbol{k}};P_{n})\leq 1}

for all

𝒌
∈

ℕ
s

{{\boldsymbol{k}}\in\mathbb{N}^{s}}

, which in turn implies that a scrambled digital

(
t
,
m
,
s
)

{(t,m,s)}

-net in base b is NLOD if and only if

t
=
0

{t=0}

. Through numerical examples we demonstrate that these

C
b

⁢

(
𝒌
;

P
n

)

{C_{b}({\boldsymbol{k}};P_{n})}

values are a powerful tool to compare the quality of different

(
t
,
m
,
s
)

{(t,m,s)}

-nets, and to enhance our understanding of how scrambling can improve the quality of deterministic point sets.
Automatic control variates for option pricing using neural networks
Authors: El Filali Ech-Chafiq Zineb , Lelong Jérôme , Reghai Adil
Published: January 2021

Many pricing problems boil down to the computation of a high-dimensional integral, which is usually estimated using Monte Carlo. In fact, the accuracy of a Monte Carlo estimator with M simulations is given by

σ

M

{\frac{\sigma}{\sqrt{M}}}

. Meaning that its convergence is immune to the dimension of the problem. However, this convergence can be relatively slow depending on the variance σ of the function to be integrated. To resolve such a problem, one would perform some variance reduction techniques such as importance sampling, stratification, or control variates. In this paper, we will study two approaches for improving the convergence of Monte Carlo using Neural Networks. The first approach relies on the fact that many high-dimensional financial problems are of low effective dimensions.
We expose a method to reduce the dimension of such problems in order to keep only the necessary variables. The integration can then be done using fast numerical integration techniques such as Gaussian quadrature. The second approach consists in building an automatic control variate using neural networks. We learn the function to be integrated (which incorporates the diffusion model plus the payoff function) in order to build a network that is highly correlated to it. As the network that we use can be integrated exactly, we can use it as a control variate.
Potential role of IFN-γ and IL-5 in sepsis prediction of preterm neonates
Authors: Vucic Jelena , Vucic Miodrag , Stankovic Tatjana , Stamenkovic Hristina , Stankovic Sandra , Zlatanovic Dragan
Published: January 2021

Not fully maturated immune system in preterm neonates may contribute to the increased susceptibility to infection. The levels of some cytokines can be useful in the prediction and diagnosis of sepsis in premature neonates. In the present study, we evaluated the potential predictive role of IFN-γ and IL-5 in cord and venous blood, together with the determination of C-reactive protein and procalcitonin (PCT) for sepsis development in premature neonates. A total of 80 participants were included. The laboratory results and clinical histories showed that 21 participants had sepsis. Early onset sepsis was detected in 3 patients while late onset sepsis was observed in 18 participants. The venous plasma levels of IFN-γ and PCT was markedly increased in sepsis groups when compared to the participants without sepsis. On the other hand, levels of IL-5 did not significantly change in the evaluated groups of sepsis and in the control group of participants. Simultaneously, plasma venous levels were not altered in any of the evaluated groups. Obtained findings suggest that venous plasma levels of IFN-γ, rather than levels of IFN-γ in cord blood plasma, and PCT may have predictive potential for sepsis development in preterm neonates. Further studies are necessary to get more comprehension of the complex function of cytokines for sepsis development in preterm neonates.
Mystery solved: Who are TESOL faculty at US universities?
Authors: Andrei Elena , Abutaleb Karmel
Published: January 2021

It is important for college students and future TESOL teachers to see someone like them among their instructors and mentors. Diverse future teachers who are trained in TESOL might be attracted to the profession based on who their teacher educators are in terms of gender, multilingualism, international studies, and/or work experience. The question for this study is: Who are TESOL (teaching English to speakers of other languages) faculty at US universities? Data on faculty who are specialists and in charge of TESOL programs was collected from publicly available university websites, specifically from 209 higher education institutions from a random sample of 34 US states. The data collected includes 511 TESOL faculty. Descriptive statistics paint a portrait of who TESOL faculty in the US are.
Culturally responsive literacy instruction: How is it reflected in the literature?
Authors: Dukes Charles , Ming Kavin M. , Finnegan Lisa A. , Miller Katie M.
Published: January 2021

The theoretical base for culturally responsive practices is well established. This strong foundation can be strengthened through the identification and description of the empirical work demonstrating the utility of these practices when used to promote skill development in children. The purpose of this qualitative review of the literature was to identify empirical studies that implemented a culturally relevant literacy practice. Twelve journals that publish work in reading/literacy were selected for review, between 2006 and 2018. Articles were coded using a system based on the culturally responsive framework identified from the extant literature detailing the theoretical base for culturally responsive pedagogy. Nineteen articles met inclusion criteria for the review. Three themes emerged related to teaching and learning. Teachers often utilized materials that were culturally specific as a part of their instruction. Students tapped into their cultural identities/backgrounds as a framework to build meaning and used their home language in class to ease discussion or reflection on readings. Implications for research and practice are discussed.
Injection locking in an optomechanical coherent phonon source
Authors: Arregui Guillermo , Colombano Martín F. , Maire Jeremie , Pitanti Alessandro , Capuj Néstor E. , Griol Amadeu , Martínez Alejandro , Sotomayor-Torres Clivia M. , Navarro-Urrios Daniel
Published: January 2021

Spontaneous locking of the phase of a coherent phonon source to an external reference is demonstrated in a deeply sideband-unresolved optomechanical system. The high-amplitude mechanical oscillations are driven by the anharmonic modulation of the radiation pressure force that result from an absorption-mediated free-carrier/temperature limit cycle, i.e., self-pulsing. Synchronization is observed when the pump laser driving the mechanical oscillator to a self-sustained state is modulated by a radiofrequency tone. We employ a pump-probe phonon detection scheme based on an independent optical cavity to observe only the mechanical oscillator dynamics. The lock range of the oscillation frequency, i.e., the Arnold tongue, is experimentally determined over a range of external reference strengths, evidencing the possibility to tune the oscillator frequency for a range up to 350 kHz. The stability of the coherent phonon source is evaluated via its phase noise, with a maximum achieved suppression of 44 dBc/Hz at 1 kHz offset for a 100 MHz mechanical resonator. Introducing a weak modulation in the excitation laser reveals as a further knob to trigger, control and stabilize the dynamical solutions of self-pulsing based optomechanical oscillators, thus enhancing their potential as acoustic wave sources in a single-layer silicon platform.
All-dielectric chiral coding metasurface based on spin-decoupling in terahertz band
Authors: Zheng Chenglong , Li Jie , Wang Guocui , Li Jitao , Wang Silei , Li Mengyao , Zhao Hongliang , Yue Zhen , Zhang Yating , Zhang Yan , Yao Jianquan
Published: January 2021

Metamaterials can achieve superior electromagnetic properties over natural materials by adjusting the structure of the meta-atoms. Chiral metamaterials have been widely used in circular dichroism (CD) spectra, polarization imaging, and optical sensing. Here we propose a kind of all-silicon coding metasurfaces to achieve the function similar to chirality by spin decoupling. One of the two circularly polarized (CP) channels is scattered randomly, and the desired function is only designed in the other opposite CP channel. Three kinds of coding metasurfaces are designed to verify the reliability of such approach: one simultaneously possessing dual function of transmitting directly and scattering randomly, one capable of generating the superposition state of vortex beam, and the other generating the Bessel vortex beam, respectively. And some experimental verifications are carried out. This scheme is simpler and more versatile than previous schemes which require elaborate designed structure of the meta-atoms. Our novel approach provides a new option for implementing tunable chirality.
Parity-time symmetry and coherent perfect absorption in a cooperative atom response
Authors: Ballantine Kyle E. , Ruostekoski Janne
Published: January 2021

Parity-Time (

P
T

$\mathcal{P}\mathcal{T}$

) symmetry has become an important concept in the design of synthetic optical materials, with exotic functionalities such as unidirectional transport and nonreciprocal reflection. At exceptional points, this symmetry is spontaneously broken, and solutions transition from those with conserved intensity to exponential growth or decay. Here, we analyze a quantum-photonic surface formed by a single layer of atoms in an array with light mediating strong cooperative many-body interactions. We show how delocalized collective excitation eigenmodes can exhibit an effective

P
T

$\mathcal{P}\mathcal{T}$

symmetry and nonexponential decay. This effective symmetry is achieved in a passive system without gain by balancing the scattering of a bright mode with the loss from a subradiant dark mode. These modes coalesce at exceptional points, evidenced by the emergence of coherent perfect absorption where coherent incoming light is perfectly absorbed and scattered only incoherently. We also show how

P
T

$\mathcal{P}\mathcal{T}$

symmetry can be generated in total reflection and by balancing scattering and loss between different polarizations of collective modes.
The crystal structure of bis(μ2-5-chloro-2-oxido-N-(1-oxidoethylidene)benzohydrazonato-κ5
N,O,O′:N′,O′′)hexkis(pyridine-κ1
N)trinickel(II) - pyridine (1/1), C63H57Cl2N13Ni3O6
Authors: Yang Liguo , Wang Xin , Luo Dan , Liu Nana , Tian Dayong
Published: January 2021

C63H57Cl2N13Ni3O6, monoclinic,

P

2
1

/
c

$P{2}_{1}/c$

, a = 16.136(4) Å, b = 16.432(4) Å, c = 23.881(6) Å, β = 101.900(3)°, V = 6196(3) Å3, Z = 4, R
gt(F) = 0.0461, wR
ref(F
2) = 0.1357, T = 298 K [1], [2], [3].
The crystal structure of 4-(4-bromophenyl)-2-(3-(4-bromophenyl)-5-(4-fluorophenyl)-4,5-dihydro-1H-pyrazol-1-yl)thiazole, C24H16Br2FN3S
Authors: Baashen Mohammed A. , Abdel-Wahab Bakr F. , Hegazy Amany S. , Kariuki Benson M. , El-Hiti Gamal A.
Published: January 2021

C24H16Br2FN3S, monoclinic, P21/n (no. 14), a = 14.9517(9) Å, b = 5.4857(3) Å, c = 27.9582(17) Å, β = 102.434(6)°, V = 2239.4(2) Å3, Z = 4, Rgt
(F) = 0.0444, wRref
(F
2) = 0.1237, T = 296 K.
Crystal structure of 2,6-bis(2-(pyridin-3-yl)ethyl)pyrrolo[3,4-f]isoindole-1,3,5,7(2H,6H)-tetraone, C24H18N4O4
Authors: Jeong Yu Jeong , Park Juhyeon , Min Ahreum , Kim Tae Ho , Choi Myong Yong
Published: January 2021

C24H18N4O4, monoclinic, P21/c (no. 14), a = 16.5930(5) Å, b = 5.7298(2) Å, c = 20.8714(6) Å, β = 99.8620(10)°, V = 1955.02(11) Å3, Z = 4, R

gt
(F) = 0.0415, wR

ref
(F
2) = 0.1115, T = 193 K.
Crystal structure of 4-(2,2-difluoroethyl)-2,4,6-trimethylisoquinoline-1,3(2H,4H)-dione, C14H15F2NO2
Authors: Li Huixing , Han Xinlong , Cao Bin
Published: January 2021

C14H15F2NO2, monoclinic, P21/c (no. 14), a = 11.5474(10) Å, b = 11.0737(7) Å, c = 11.4311(10) Å, β = 114.979(11)°, V = 1325.0(2) Å3, Z = 4, R

gt
(F) = 0.0738, wR

ref
(F
2) = 0.2034, T = 293(2) K.
Zur Befestigung: Verteidigungsanlage und Prestigebau
Authors: Heske Immo , Posselt Martin
Published: January 2021

In den zurückliegenden Jahren wurde die Außensiedlung der Hünenburg bei Watenstedt intensiv weiträumig prospektiert und ausschnittsweise archäologisch untersucht. Die Forschungen erbrachten vielfältige Einblicke in den Formenbestand der Keramik, die wirtschaftliche Struktur, Belege für die rituelle Nutzung in differenzierten Kontexten und die chronologische Entwicklung des Siedlungsareals. Der Forschungsstand zur eigentlichen Befestigung konnte nach den Grabungen bis 2000 nicht mehr erweitert werden. Im Rahmen des im Jahr 2013 begonnenen DFG-Forschungsprojektes „Landschafts- und Ressourcennutzung in der jüngeren Bronzezeit am Heeseberg (nördliches Harzvorland) im Spannungsfeld von Herrschaft, Handwerk und Kult“, war es zunächst Aufgabe, das direkte Wallvorfeld zu untersuchen, an diese Aufgaben schloss sich auch ein Wallschnitt an. Die Befunde lassen auf Einbauten, Räume oder Kasematten im Wall schließen. Es konnten in diesem Befundkontext auch „Speichergruben“ im Wall entdeckt werden.

Anschließend wurde der Innenraum der Hünenburg vollständig geophysikalisch prospektiert. Die Messungen liefern Hinweise auf Erosionsmerkmale innerhalb der Anlage. Von besonderer Bedeutung sind jedoch die vielfältigen Grabensysteme im Innenraum, die u. a. eine vorwallzeitliche Befestigungsphase belegen. Mit den bisherigen Untersuchungen und anschließenden Ausgrabungen lassen sich Hinweise auf die zeitliche Strukturierung gewinnen. Diese erfordern, das fortifikatorische Konzept der Befestigungsanlage in ihrer Frühphase und den folgenden Aus- und Umbau der Wallstrukturen einer neuen Bewertung zu unterziehen.
Organometallic complexes of neodymium: an overview of synthetic methodologies based on coordinating elements
Authors: Asif Adeena , Nadeem Rana Yasir , Iqbal Muhammad Adnan , Bibi Shamsa , Irfan Muhammad
Published: January 2021

Organometallic complexes of neodymium have unique coordinating ability to form both micro and macromolecules as well as metal-based polymers. These complexes have been reported in different fields and play a tremendous role in luminescence, catalytic, biological and magnetic applications. So, the current study will comprise all possible routes for the synthesis of organometallic complexes of neodymium. Neodymium complexes have been synthesized of single, double, triple and tetra linkages with H, C, N, O as well as S, B, and X. The detailed synthetic routes have been classified into four categories but in brief, neodymium forms complexes by reacting metal chloride, nitrate or oxide (hydrated or dehydrated) as precursor along with appropriate ligand. Most applied solvents for neodymium complexes were Toluene and THF. These complexes required a range of temperature based on the nature of complexes as well as linkages. The authors have surveyed the research work published through 2011–2020 and provide a comprehensive overview to understand the synthetic routes of organometallic complexes of neodymium.
COVID-19 associated central nervous system manifestations, mental and neurological symptoms: a systematic review and meta-analysis
Authors: Soltani Saber , Tabibzadeh Alireza , Zakeri Armin , Zakeri Amir Mohammad , Latifi Tayebeh , Shabani Mahdi , Pouremamali Amir , Erfani Yousef , Pakzad Iraj , Malekifar Pooneh , Valizadeh Reza , Zandi Milad , Pakzad Reza
Published: January 2021

The ongoing pandemic of Coronavirus disease 2019 (COVID-19) has infected more than 27 million confirmed cases and 8,90,000 deaths all around the world. Verity of viral infections can infect the nervous system; these viral infections can present a wide range of manifestation. The aim of the current study was to systematically review the COVID-19 associated central nervous system manifestations, mental and neurological symptoms. For that we conducted a comprehensive systematic literature review of four online databases, including Web of Science, PubMed, Scopus and Embase. All relevant articles that reported psychiatric/psychological symptoms or disorders in COVID-19 without considering time and language restrictions were assessed. All the study procedures were performed based on the PRISMA criteria. Due to the screening, 14 studies were included. The current study result indicated that, the pooled prevalence of CNS or mental associated disorders with 95% CI was 50.68% (6.68–93.88). The most prevalence symptoms were hyposmia/anosmia/olfactory dysfunction (number of study: 10) with 36.20% (14.99–60.51). Only one study reported numbness/paresthesia and dysphonia. Pooled prevalence of numbness/paresthesia and dysphonia was 5.83% (2.17–12.25) and 2.39% (10.75–14.22). The pooled prevalence of depression and anxiety was 3.52% (2.62–4.54) and 13.92% (9.44–19.08). Our findings demonstrate that COVID-19 has a certain relation with neurological symptoms. The hypsomia, anosmia or olfactory dysfunction was most frequent symptom. Other symptoms were headache or dizziness, dysgeusia or ageusia, dysphonia and fatigue. Depression, anxiety, and confusion were less frequent symptoms.
Stability and prevalence of McKean–Vlasov stochastic differential equations with non-Lipschitz coefficients
Authors: Mezerdi Mohamed Amine , Khelfallah Nabil
Published: January 2021

We consider various approximation properties for systems driven by a
McKean–Vlasov stochastic differential equations (MVSDEs) with continuous
coefficients, for which pathwise uniqueness holds. We prove that the solution
of such equations is stable with respect to small perturbation of initial
conditions, parameters and driving processes. Moreover, the unique strong
solutions may be constructed by an effective approximation procedure. Finally,
we show that the set of bounded uniformly continuous coefficients for which
the corresponding MVSDE have a unique strong solution is a set of second
category in the sense of Baire.
Energy harvesters for rotating systems: Modeling and performance analysis
Authors: Basheer Faiz , Mehaisi Elmehaisi , Elsergany Ahmed , ElSheikh Ahmed , Ghommem Mehdi , Najar Fehmi
Published: January 2021

An exclusive reliance on batteries for miniature sensors has created the need for a self-sustained energy harvester to enable permanent power. This work introduces a pendulum-based energy harvester that is capable of harnessing kinetic energy from rotating structures to generate electric power through electromagnetic transduction. A computational model of the energy harvesting device is developed on Simscape to compute, analyze and compare the power generation capacities of the single, double and Rott’s pendulum systems. Simulation results are validated against their experimental counterparts reported in the literature. Results show an increase in the output voltage in a specific range of rotational speed for all three pendulum harvesters. The double pendulum exhibits the highest power generation potential among the simulated pendulum arrangements. A parametric study revealed that increasing the damping of the harvester decreased its output power, whereas an increase in mass and length of the harvester is observed to increase the output power and shift the optimal power generation subrange.
The clinical significance of glutathione peroxidase 2 in glioblastoma multiforme
Authors: Guo Bangming , Liao Wenjuan , Wang Shusheng
Published: January 2021

Background

Glioblastoma multiforme (GBM) is the leading cause of death among adult brain cancer patients. Glutathione peroxidase 2 (GPX2), as a factor in oxidative stress, plays an important role in carcinogenesis. However, its role in GBM has not been well established. The study aimed to investigate the clinical significance of GPX2 with GBM prognosis.

Methods

Data of GBM and healthy individuals were retrospectively collected from oncomine, cancer cell line encyclopedia (CCLE), gene expression profiling interactive analysis (GEPIA), UALCAN, and Human Protein Atlas. GPX2 mRNA expression was first assessed across various cancer types in oncomine and cancer cell lines from CCLE. The mRNA expression of GPX2 was compared between normal and GBM tissues using GEPIA (normal = 207; GBM = 163) and UALCAN (normal = 5; GBM = 156). The GPX2 methylation was analyzed using data from UALCAN (normal = 2; GBM = 140). The prognostic value of GPX2 in GBM was explored in GEPIA and UALCAN using Kaplan–Meier method. STRING database was used to construct protein–protein interaction (PPI) network and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway. Statistical significance was set as <0.05.

Results

The current study revealed no significant differences in GPX2 expression between normal and GBM from GEPIA data (P > 0.05) and UALCAN (P = 0.257). Patients with higher GPX2 intended to have a poorer prognosis (P = 0.0089). The KEGG pathways found that chemokine-signaling pathway were the more preferred.

Conclusions

The findings demonstrated that GPX2 might be a potential diagnosis and prognostic indicator for GBM. Chemokine-signaling pathway may be involved in GPX2 function.
On optional wh-/focus fronting in Igbo: A SYN-SEM-PHON interaction
Authors: Amaechi Mary , Georgi Doreen
Published: January 2021

This paper discusses surface optionality in focus fronting in the Benue-Congo language Igbo. A focused XP can occur in-situ or ex-situ. We argue that the optionality does not have its origins in the syntax: in fact, exactly one focused XP has to move to the designated focus position in the left periphery in the syntax. The alternation between in-situ and ex-situ rather arises at PF: either the lowest or the topmost copy of the focus chain is pronounced. The choice is determined by semantic-pragmatic factors, i. e., we see an interaction between PF and LF. This constitutes a challenge for a strict version of the Y-model of grammar.
Analyzing free variation with harmony – A case study of verb-cluster serialization
Authors: Bader Markus
Published: January 2021

In German, a verb selected by another verb normally precedes the selecting verb. Modal verbs in the perfect tense provide an exception to this generalization because they require the perfective auxiliary to occur in cluster-initial position according to prescriptive grammars. Bader and Schmid (2009b) have shown, however, that native speakers accept the auxiliary in all positions except the cluster-final one. Experimental results as well as corpus data indicate that verb cluster serialization is a case of free variation. I discuss how this variation can be accounted for, focusing on two mismatches between acceptability and frequency: First, slight acceptability advantages can turn into strong frequency advantages. Second, syntactic variants with basically zero frequency can still vary substantially in acceptability. These mismatches remain unaccounted for if acceptability is related to frequency on the level of whole sentence structures, as in Stochastic OT (Boersma and Hayes2001). However, when the acceptability-frequency relationship is modeled on the level of individual weighted constraints, using harmony as link (see Pater2009, for different harmony based frameworks), the two mismatches follow given appropriate linking assumptions.
Mid-level generalizations of generative linguistics: Experimental robustness, cognitive underpinnings and the interdisciplinarity paradox
Authors: Leivada Evelina
Published: January 2021

This work examines the nature of the so-called “mid-level generalizations of generative linguistics” (MLGs). In 2015,Generative Syntax in the 21st Century: The Road Aheadwas organized. One of the consensus points that emerged related to the need for establishing a canon, the absence of which was argued to be a major challenge for the field, raising issues of interdisciplinarity and interaction. Addressing this challenge, one of the outcomes of this conference was a list of MLGs. These refer to results that are well established and uncontroversially accepted. The aim of the present work is to embed some MLGs into a broader perspective. I take the Cinque hierarchies for adverbs and adjectives and the Final-over-Final Constraint as case studies in order to determine their experimental robustness. It is showed that at least some MLGs face problems of inadequacy when tapped into through rigorous testing, because they rule out data that are actually attested. I then discuss the nature of some MLGs and show that in their watered-down versions, they do hold and can be derived from general cognitive/computational biases. This voids the need to cast them as language-specific principles, in line with the Chomskyan urge to approach Universal Grammar from below.