bluuebunny/crossref_metadata_2025 huggingface dataset:
Improved Pole-placement Control with Feed-forward Dead Zone Compensation for Position Tracking of Electro-Pneumatic Actuator System Improved Pole-placement Control with Feed-forward Dead Zone Compensation for Position Tracking of Electro-Pneumatic Actuato
Authors: Sunar Noorhazirah , Rahmat Mohd Fua’ad , Mohd Fauzi Ahmad ‘Athif , Ismail Zool Hilmi , Osman Siti Marhanis , Sulaiman Siti Fatimah
Published: August 2021

Dead-zone in the valve degraded the performances of the Electro-Pneumatic Actuator (EPA) system.  It makes the system difficult to control, become unstable and leads to chattering effect nearest desired position.  In order to cater this issue, the EPA system transfer function and the dead-zone model is identified by MATLAB SI toolbox and the Particle Swarm Optimization (PSO) algorithm respectively.  Then a parametric control is designed based on pole-placement approach and combine with feed-forward inverse dead-zone compensation.  To reduce chattering effect, a smooth parameter is added to the controller output.  The advantages of using these techniques are the chattering effect and the dead-zone of the EPA system is reduced.  Moreover, the feed-forward system improves the transient performance.  The results are compared with the pole-placement control (1) without compensator and (2) with conventional dead-zone compensator.  Based on the experimental results, the proposed controller reduced the chattering effect due to the controller output of conventional dead-zone compensation, 90% of the pole-placement controller steady-state error and 30% and 40% of the pole-placement controller with conventional dead-zone compensation settling time and rise time.
Dual-wide Band bended cloth Antenna for ISM and WLAN applications
Authors: Hashim Fatimah Fawzi , Mahadi Wan Nor Liza , Abdul Latef Tarik , Ariff Mohamad
Published: August 2021

A directional bended microstrip patch antenna was designed for dual-band ISM applications. CST (2014) was used to simulate an antenna with the dimension of 50 x 20 x 1.04 mm and felt substrate with partial copper ground. This antenna was operated at 2.4 GHz and 5.0 GHz with gains of 1.6 dBi and 5.61 dBi and bandwidths of 40% and 75%. The proposed antenna was bended to cater the human body curves. The proposed bended structure gave a high performance in free space, and the results were found identical with the phantom simulation results. This antenna is deemed suitable to be built in clothes for WBNs applications.
The Impact of the COVID-19 on the Construction Industry in Vietnam
Authors: Nguyen Van Tam , Nguyen Bao Ngoc , Nguyen Toan Quoc , Dinh Hai Tuan , Chu Anh Tung
Published: September 2021

The COVID-19 pandemic has generated a wide range of socio-economic disruption, which causes devastating in numerous aspects. Our knowledge of the true health of the construction industry under the ravage of COVID-19 outbreak is largely based on very limited data. This study aims to assess the impact of pandemic on the construction industry through an investigation in Vietnam. Data were collected through 129 respondents whose online questionnaire survey completed according to their recent direct or indirect participation in delivering construction projects during the spread. The implications of COVID-19 on the construction industry were examined based on simple percentage analysis and Relative Importance Index approaches. Three principal facets of the construction industry were considered: firms' business activities, project performance, and workforce demand. The findings highlighted the multilevel, multidimensional nature of the epidemic consequences on the construction sector. Notably, the revenue and profitability, in a general sense, have decreased during the COVID-19 period, while most of the production and business costs had remained unchanged. Further, the pandemic was argued to impair construction practitioners' incomes and mental health and sabotage projects' schedule and cost.
Assessing The Thermal Comfort Conditions In Open Spaces: A Transversal Field Survey On The University Campus In India
Authors: Kumar Pardeep , Sharma Amit
Published: September 2021

Outdoor thermal comfort (OTC) promotes the usage frequency of public places, recreational activities, and people's wellbeing. Despite the increased interest in OTC research in the past decade, less attention has been paid to OTC research in cold weather, especially in arid regions. The present study investigates the OTC conditions in open spaces at the campus area in the arid region. The study was conducted by using subjective surveys(questionnaire) and onsite monitoring (microclimate parameters). The study was conducted at the Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Haryana-India campus during the cold season of 2019. The timings of surveys were between 9:00 and 17:00 hours. The authors processed the 185 valid questionnaire responses of the respondents to analyze OTC conditions. Only 8.6% of the respondents marked their perceived sensation "Neutral." Regression analysis was applied between respondents' thermal sensations and microclimate parameters to develop the empirical thermal sensation model. The air temperature was the most dominant parameter affecting the sensations of the respondents. The empirical model indicated that by increasing air temperature, relative humidity, and solar radiation, the thermal sensations also increased while wind speed had an opposite effect. Physiological equivalent temperature (PET) was applied for assessing the OTC conditions; the neutral PET range was found to be 18.42-25.37°C with a neutral temperature of 21.89°C. The preferred temperature was 21.99 °C by applying Probit analysis. The study's findings could provide valuable information in designing and planning outdoor spaces for educational institutions in India's arid regions
Relationship Between Personality and Music Preferences Among University Students
Authors: Minnie Tai , Mahmud Norashikin , Wan Mohd Yunus Wan Mohd Azam , Nordin Nor Akmar
Published: September 2021

This study analysed the relationship between Big Five personality traits and music preferences among university students. Big Five Inventory (BFI) and Short Test of Music Preferences (STOMP)  was used to assess personality traits and music preferences. Questionnaires were distributed through social media platforms to college and university students aged 19 to 26. A total number of 145 respondents participated in this study. The results showed Agreeableness, Conscientiousness, and Openness were the most prevalent personality traits among respondents and Energetic-Rhythmic (ER) was the most preferred music. The correlation analysis showed that there is a significant correlation between Openness and energetic-rhythmic (ER) music. On the other hand, there was no significant correlation between other traits (Conscientiousness, Extraversion, Agreeableness, and Neuroticism) with music preference dimensions such as Intense-Rebellious (IR) and Energetic-Rhythmic (ER). The inconsistencies in the literature and our findings suggested more studies are needed to understand the influence of personality on music preferences.
Hubungan antara Empati dengan Tingkah laku Prososial dalam kalangan Pelajar Kejuruteraan Universiti
Authors: Mohd Sukeri Nur Fatin Afifah , Mahfar Mastura , Mohd Sukor Mohammad Saipol
Published: September 2021

Prosocial behavior is any form of act or activity that is intended to help or give another person the benefit without expecting any reward. One of the factors that can contribute to prosocial behavior is empathy. This study was conducted to identify the relationship between empathy and university students’ prosocial behaviors at one of the schools of engineering. A total of 94 fourth-year engineering students were selected by employing a simple random sampling method in this study. The Interpersonal Reactivity Index (IRI), and the Prosocial Tendencies Measure (PTM) questionnaires were used to measure empathy and prosocial behavior. The study used descriptive statistical analysis through scores, mean and frequency to measure the level of empathy and prosocial behavior, while inferential statistics used t-test to measure differences in prosocial behavior by gender, and Pearson's correlation to identify the relationship between empathy and prosocial behavior. The findings of the study show that the levels of empathy and prosocial behavior of the respondents are moderate. There was no significant difference of prosocial behavior based on gender. Correlation analysis revealed that there was a relationship between empathy and prosocial behavior. All the dimensions of empathy which are “fantasy”, “perspective-taking”, “empathic concern” and “personal distress” have significant positive relationships with prosocial behavior.
Pengalaman Pembelajaran Informal dalam kalangan Pengusaha Bengkel Automotif di Kota Tinggi, Johor
Authors: Nadira Nur Amelina , Abd Hamid Mohd Azhar , Norazman Irmawati , Thukiman Kassim , Markom Mohd Nasir , Othman Muhammed Fauzi , Balwi Mohd. Koharuddin
Published: September 2021

This research purpose is to examine the informal learning among automotive workshop entrepreneurs. Three research objectives such as informal learning factors, informal learning strategies and informal learning effects are also identified. This study used a case study by using a qualitative method. Semi-structured interviews have been used for data collection. By using purposive sampling, five automotive workshop entrepreneurs in Kota Tinggi were selected as respondents. The findings show that individual needs, environment, interests, motivations and job requirements have been factors that help automotive workshop entrepreneurs involved in informal learning. In addition, reading materials, electronic media, observation, consulting with experts and try and error are informal learning strategies that have been used. Moreover, the effects of informal learning can be seen as the enhancement of knowledge and skills. Meanwhile, there has been a positive change in the attitude of automotive workshop entrepreneurs. This study also provided suggestions for improvement to future researchers.
Personal Growth Initiative and Self-Regulated Learning in Students with Low Intelligence Potential
Authors: Saraswati Putri , Winarsunu Tulus
Published: September 2021

Students with low intelligence potential, have limitations in academic matters. Unlike students with average intelligence, students with low intelligence will find difficulties in completing their academic tasks. Frequently, when their intelligence potentials have not been identified and are included in a regular class, they have to meet the same demands with other students who have normal/average intelligence. Therefore, they struggle to complete the given academic tasks. Their efforts to manage thoughts, feelings and behavior to achieve goals are called Self Regulated Learning (SRL). This study aims to determine the relationship of Personal Growth Initiative (PGI) and Self Regulated Learning in students with low intelligence potential. The research method used is quantitative correlational. The data collection tool used is the PGI and SRL Likert scale; the results of the filling scale are analyzed by product moment correlation statistical techniques. The results show a positive relationship between PGI and SRL (r = 0.677, sig. 0.032) with a contribution of 45.8%. The implication that can be drawn from this research is that it provides proper psychological treatment to students with low intelligence potential so that they can stay motivated in learning process.
Growth Mindset Leads Grittier Students
Authors: Nur Wahidah Fatin Rohmah , Royanto Lucia R M
Published: September 2021

This study investigates the relationship between a growth mindset and grit. The subjects involved in this study are students from high public and private schools in Purbalingga, Central Java (n=418). The research method used is a quantitative method with data collection through three sets of questionnaires, i.e., Mindset Scale (20 items, α=0.804) and Grit Scale for Children and Adult (12 items, α=0.774). Results indicated a positive correlation between the growth mindset and grit. Grit also confirmed affected by a growth mindset (β=0.445, p<0.001). The growth mindset in students predicts grittier students to achieve goals and the best performance.
Adipose‐related microRNAs as modulators of the cardiovascular system: the role of epicardial adipose tissue
Authors: Santos Diana , Carvalho Eugenia
Published: August 2021

Adipose tissue expansion and subsequent metabolic dysfunction has been considered one of the major risk factors for development of cardiometabolic disease. Epicardial adipose tissue (EAT) in particular is a unique subtype of visceral adipose tissue located on the surface of the heart, around the coronary arteries. Due to its proximity, EAT can modulate the local metabolic and immune function of cardiomyocytes and coronary arteries. Several microRNAs have been described as key players in both cardiac and vascular function that when dysregulated will contribute to dysfunction. Here we review the influence of obesity in the crosstalk between specific adipose tissue types, in particular the EAT‐secreted microRNAs, as key modulators of cardiac disease progression, not only as early biomarkers but also as therapeutic targets for cardiometabolic disease.

image
A Parametric Examination of the Factors Affecting the Performance of a Diffusion Absorption Refrigeration System
Authors: Yousuf Noman Uddin , Anderson Timothy , Nates Roy
Published: September 2021

Despite being identified nearly a century ago, the diffusion absorption refrigeration (DAR) cycle has received relatively little attention. One of the strongest attractions of the DAR cycle lies in the fact that it is thermally driven and does not require high value work. This makes it a prime candidate for harnessing low-grade heat from solar collectors, or the waste heat from stationary generators, to produce cooling. However, to realize the benefits of the DAR cycle, there is a need to develop an improved understanding of how design parameters influence its performance. In this vein, this work developed a new, validated, parametric model that can be used by designers and practitioners to examine the performance of the DAR cycle for a range of operating conditions. The results showed that the cycle’s performance was particularly sensitive to several factors: the rate of heat added and the temperature of the generator, the effectiveness of the gas and solution heat exchangers, the mass flowrate of the refrigerant and the type of the working fluid. It was shown that it can deliver good performance at low generator temperatures if the refrigerant mass fraction in the strong solution is made as high as possible. Moreover, it was shown that a H2O–LiBr working pair could be useful for achieving cooling at low generator temperatures.
Recognising the social determinants of mental distress
Authors: Ballantyne Neil , Beddoe Liz
Published: September 2021

Editorial
Trauma, women’s mental health, and social justice: Pitfalls and possibilities
Authors: Staniforth Barbara
Published: September 2021

Book review
Using Math in Physics: 1. Dimensional Analysis
Authors: Redish Edward F.
Published: September 2021

Making meaning with math in physics requires blending physical conceptual knowledge with mathematical symbology. Students in introductory physics classes often struggle with this, but it is an essential component of learning how to think with math. Teaching the dimensionality of measured quantities and dimensional analysis (DA) is a valuable first step in helping them learn to appreciate this difference. In this paper I discuss some of the issues associated with learning dimensional analysis and show some ways we can modify our instruction to help. This paper is one of a series on how to help students develop the scientific thinking skills required for learning to use math in science.
Discovery of mesoscopic nematicity wave in iron-based superconductors
Authors: Shimojima T. , Motoyui Y. , Taniuchi T. , Bareille C. , Onari S. , Kontani H. , Nakajima M. , Kasahara S. , Shibauchi T. , Matsuda Y. , Shin S.
Published: September 2021

Patterned nematics

Electrons in solids can break rotational symmetry, resulting in electronic nematicity. This phenomenon has been observed in both cuprate-based and iron-based high-temperature superconductors, and its relationship to superconductivity remains a subject of debate. Shimojima
et al
. used linear dichroism measurements to image nematicity in two iron-based superconductors. Unexpectedly, the researchers found periodic patterns with very long wavelengths. The findings could be described with a phenomenological model assuming a train of nematic domain walls. —JS
Draft Genome Sequence of Enterobacter oligotrophicus, Isolated from the Microbiome of a Lizard in the Caribbean
Authors: Pot Matthieu , Ducat Célia , Reynaud Yann , Couvin David , Ferdinand Séverine , Breurec Sébastien , Talarmin Antoine , Guyomard-Rabenirina Stéphanie
Published: September 2021

Here, we describe the genome sequence of ECC486. This
Enterobacter oligotrophicus
strain was isolated from a wild
Anolis marmoratus speciosus
specimen, a lizard endemic to the territory of Guadeloupe (French West Indies). Its draft genome sequence consists of 40 contigs and contains a total of 4,504,233 bp, with a G+C content of 54.1%.
Complete Genome Sequence of Streptococcus oralis 34
Authors: Kaspar Justin R.
Published: September 2021

Streptococcus oralis
is an early colonizer and one of the most abundant species found in the human oral cavity. We report the complete genome sequence of
S. oralis
34 (1,920,884 bp; GC content, 41.3%), commonly used in many oral microbiology studies exploring bacterial attachment and interaction(s) within mixed-species model systems.
Supplemental Material: Flood basalts, rhyolites, and subsequent volcanism of the Columbia River magmatic province in eastern Oregon, USA
Authors: Cahoon Emily
Published: August 2021

Appendix A: Sample Whole Rock (X-ray Fluorescence Spectrometry and Inductively Coupled Plasma–Mass Spectrometry) and Location Data
Whose voices should shape global health education? Curriculum codesign and codelivery by people with direct expertise and lived experience
Authors: Sbaiti Mariam , Streule Mike J , Alhaffar Mervat , Pilkington Victoria , Leis Melanie , Budhathoki Shyam Sundar , Mkhallalati Hala , Omar Maryam , Liu Lillian , Golestaneh Amelia Kataria , Abbara Aula
Published: September 2021

There are contrasting opinions of what global health (GH) curricula should contain and limited discussion on whose voices should shape it. In GH education, those with first-hand expertise of living and working in the contexts discussed in GH classrooms are often absent when designing curricula. To address this, we developed a new model of curriculum codesign called Virtual Roundtable for Collaborative Education Design (ViRCoED). This paper describes the rationale and outputs of the ViRCoED approach in designing a new section of the Global Health Bachelor of Science (BSc) curriculum at Imperial College London, with a focus on healthcare in the Syrian conflict. The team, importantly, involved partners with lived and/or professional experience of the conflict as well as alumni of the course and educators in all stages of design and delivery through to marking and project evaluation. The project experimented with disrupting power dynamics and extending ownership of the curriculum beyond traditional faculty by codesigning and codelivering module contents together with colleagues with direct expertise and experience of the Syrian context. An authentic approach was applied to assessment design using real-time syndromic healthcare data from the Aleppo and Idlib Governorates. We discuss the challenges involved in our collaborative partnership and describe how it may have enhanced the validity of our curriculum with students engaging in a richer representation of key health issues in the conflict. We observed an enhanced self-reflexivity in the students’ approach to quantitative data and its complex interpretation. The dialogic nature of this collaborative design was also a formative process for partners and an opportunity for GH educators to reflect on their own positionality. The project aims to challenge current standards and structures in GH curriculum development and gesture towards a GH education sector eventually led by those with lived experience and expertise to significantly enhance the validity of GH education.
Search for signatures of sterile neutrinos with Double Chooz
Authors: Abrahão T. , Almazan H. , dos Anjos J. C. , Appel S. , Barriere J. C. , Bekman I. , Bezerra T. J. C. , Bezrukov L. , Blucher E. , Brugière T. , Buck C. , Busenitz J. , Cabrera A. , Cerrada M. , Chauveau E. , Chimenti P. , Corpace O. , Dawson J. V. , Djurcic Z. , Etenko A. , Furuta H. , Gil-Botella I. , Givaudan A. , Gomez H. , Gonzalez L. F. G. , Goodman M. C. , Hara T. , Haser J. , Hellwig D. , Heuermann L. , Hourlier A. , Ishitsuka M. , Jochum J. , Jollet C. , Kale K. , Kaneda M. , Karakac M. , Kawasaki T. , Kemp E. , de Kerret H. , Kryn D. , Kuze M. , Lachenmaier T. , Lane C. E. , Lasserre T. , Lastoria C. , Lhuillier D. , Lima Jr H. P. , Lindner M. , López-Casta no J. M. , LoSecco J. M. , Lubsandorzhiev B. , Maeda J. , Mariani C. , Maricic J. , Martino J. , Matsubara T. , Mention G. , Meregaglia A. , Miletic T. , Milincic R. , Minotti A. , Navas-Nicolás D. , Novella P. , Oberauer L. , Obolensky M. , Onillon A. , Oralbaev A. , Palomares C. , Pepe I. M. , Pronost G. , Reichenbacher J. , Reinhold B. , Schönert S. , Schoppmann S. , Scola L. , Sharankova R. , Sibille V. , Sinev V. , Skorokhvatov M. , Soldin P. , Stahl A. , Stancu I. , Stokes L. F. F. , Suekane F. , Sukhotin S. , Sumiyoshi T. , Sun Y. , Veyssiere C. , Viaud B. , Vivier M. , Wagner S. , Wiebusch C. , Yang G. , Yermia F.
Published: August 2021

We present a search for signatures of neutrino mixing of electron anti-neutrinos with additional hypothetical sterile neutrino flavors using the Double Chooz experiment. The search is based on data from 5 years of operation of Double Chooz, including 2 years in the two-detector configuration. The analysis is based on a profile likelihood, i.e. comparing the data to the model prediction of disappearance in a data-to-data comparison of the two respective detectors. The analysis is optimized for a model of three active and one sterile neutrino. It is sensitive in the typical mass range $${5 \times 10^{-3}}\,\mathrm{eV}^2 \lesssim \varDelta m^2_{41} \lesssim {3 \times 10^{-1}}\,\mathrm{eV}^2 $$

5
×

10

-
3

eV

2

≲
Δ

m
41
2

≲

3
×

10

-
1

eV

2

for mixing angles down to $$\sin ^2 2\theta _{14} \gtrsim {0.02} $$

sin
2

2

θ
14

≳

0.02

. No significant disappearance additionally to the conventional disappearance related to $$\theta _{13} $$

θ
13

is observed and correspondingly exclusion bounds on the sterile mixing parameter $$\theta _{14} $$

θ
14

as a function of $$ \varDelta m^2_{41} $$

Δ

m
41
2

are obtained.
Cosmological dynamics and bifurcation analysis of the general non-minimal coupled scalar field models
Authors: Khyllep Wompherdeiki , Dutta Jibitesh
Published: August 2021

Non-minimal coupled scalar field models are well-known for providing interesting cosmological features. These include a late-time dark energy behavior, a phantom dark energy evolution without singularity, an early-time inflationary Universe, scaling solutions, convergence to the standard $$\Lambda $$
Λ
CDM, etc. While the usual stability analysis helps us determine the evolution of a model geometrically, bifurcation theory allows us to precisely locate the parameters’ values describing the global dynamics without a fine-tuning of initial conditions. Using the center manifold theory and bifurcation analysis, we show that the general model undergoes a transcritical bifurcation, predicting us to tune our models to have certain desired dynamics. We obtained a class of models and a range of parameters capable of describing a cosmic evolution from an early radiation era towards a late time dark energy era over a wide range of initial conditions. There is also a possible scenario of crossing the phantom divide line. We also find a class of models where the late time attractor mechanism is indistinguishable from a structurally stable general relativity-based model; thus, we can elude the big rip singularity generically. Therefore, bifurcation theory allows us to select models that are viable with cosmological observations.
Thermal state of a conical antenna cooled by means of nanofluid saturated porous media
Authors: Baïri A. , Alilat N. , Csak T. , Adeyeye K. , Martín-Garín A. , Millán-García J. A.
Published: August 2021

Thermal state of a conical antenna used for big data transfer was determined in this work. Its cooling is provided through porous media saturated with water-based copper nanofluid (NF) whose volume fraction varies in the 0% (pure water) [Formula: see text] range. Otherwise, the ratio between the thermal conductivity of the highly porous material and that of the fluid base (water) varies between 4 and 41.2. The solution is obtained by means of 3D numerical approach based on the volume control method using the SIMPLE algorithm in the large [Formula: see text]–[Formula: see text] Rayleigh number range. The average temperature of the antenna can be determined with the correlation proposed in this work for any combination of the thermal conductivity ratio, volume fraction and Rayleigh number. This new and original correlation makes it possible to determine the optimal values of these three influencing parameters to ensure the correct antenna’s operation.
Three-dimensional uncertain heat equation
Authors: Ye Tingqing , Yang Xiangfeng
Published: August 2021

Heat equation is a partial differential equation describing the temperature change of an object with time. In the traditional heat equation, the strength of heat source is assumed to be certain. However, in practical application, the heat source is usually influenced by noise. To describe the noise, some researchers tried to employ a tool called Winner process. Unfortunately, it is unreasonable to apply Winner process in probability theory to modeling noise in heat equation because the change rate of temperature will tend to infinity. Thus, we employ Liu process in uncertainty theory to characterize the noise. By modeling the noise via Liu process, the one-dimensional uncertain heat equation was constructed. Since the real world is a three-dimensional space, the paper extends the one-dimensional uncertain heat equation to a three-dimensional uncertain heat equation. Later, the solution of the three-dimensional uncertain heat equation and the inverse uncertainty distribution of the solution are given. At last, a paradox of stochastic heat equation is introduced.
The Role of Random Structures in Tissue Formation: From a Viewpoint of Morphogenesis in Stochastic Systems
Authors: Jiang Yuanren , Lin Wei
Published: September 2021

In this article, we investigate a type of biological tissue formation system with a random structure of reaction or/and diffusion, analyzing the connection with the results obtained in [Rajapakse & Smale, 2017a] for the corresponding deterministic systems and showing the major difference from these results. Interestingly, we find a dynamical phenomenon leading to morphogenesis or emergence in such a system. Also we find their transitions in this system, while only one type of dynamical behavior occurs for the deterministic systems that satisfy typical conditions. Using the stability theory of stochastic systems, we quantitatively elucidate how such a phenomenon is emergent in complex networks with random structures. We believe that our analytical results could be beneficial to understand the underlying mechanisms of complexity-induced functions in tissue formation within real environments.
Gravitoelectromagnetism and stellar orbits in galaxies
Authors: Toth Viktor T.
Published: August 2021

Beyond the Newtonian approximation, gravitational fields in general relativity can be described using a formalism known as gravitoelectromagnetism. In this formalism, a vector potential, the gravitomagnetic potential, arises as a result of moving masses, in strong analogy with the magnetic force due to moving charges in Maxwell’s theory. Gravitomagnetism can affect orbits in the gravitational field of a massive, rotating body. This raises the possibility that gravitomagnetism may serve as the dominant physics behind the anomalous rotation curves of spiral galaxies, eliminating the need for dark matter. In this essay, we methodically work out the magnitude of the gravitomagnetic equivalent of the Lorentz force and apply the result to the Milky Way. We find that the resulting contribution is too small to produce an observable effect on these orbits. We also investigate the impact of cosmological boundary conditions on the result and find that these, too, are negligible.
Gravitational waves from dynamical shape transition of protoneutron stars
Authors: Rodrigues H. , Rosero-Gil J. A. , Endler A. M. , Duarte S. B. , Chiapparini M.
Published: August 2021

We describe the dynamical behavior of newborn neutron stars modelled as homogeneous rotating spheroids. The dynamical evolution is triggered by the escape of trapped neutrinos, providing the initial equilibrium configuration. It is shown that for a given set of values of the initial angular momentum, a shape transition to a triaxial ellipsoid configuration occurs. Gravitational waves are then generated by the breaking of the axial symmetry, and some aspects of their observation are discussed. We found a narrow window for both, the initial values of the angular frequency and the eccentricity, able to enable a dynamical shape transition, with their upper bound determined by the Kepler frequency. The energy and angular momentum carried away by the gravitational wave are treated consistently with the solution of the equations of motion of the system.
Analysis of kinetic freeze-out temperature and transverse flow velocity in nucleus–nucleus and proton–proton collisions at same center-of-mass energy
Authors: Waqas M. , Peng G. X. , Wazir Z. , Lao Hai-Ling
Published: August 2021

Transverse momentum spectra of different types of identified charged particles in central Gold–Gold (Au–Au) collisions and inelastic (INEL) or nonsingle diffractive (NSD) proton–proton (pp) collisions at the Relativistic Heavy Ion Collider (RHIC), as well as in central and peripheral Lead–Lead (Pb–Pb) collisions, and INEL or NSD pp collisions at the Large Hadron Collider (LHC) are analyzed by the blast-wave model with Tsallis statistics. The model results are approximately in agreement with the experimental data measured by STAR, PHENIX and ALICE Collaborations in special transverse momentum ranges. Kinetic freeze-out (KFO) temperature and transverse flow velocity are extracted from the transverse momentum spectra of the particles. It is shown that KFO temperature of the emission source depends on mass of the particles, which reveals the mass-dependent KFO scenario in collisions at RHIC and LHC. Furthermore, the KFO temperature and transverse flow velocity in central nucleus–nucleus (AA) collisions are larger than in peripheral collisions, and both of them are slightly larger in peripheral nucleus–nucleus collisions or almost equivalent to that in proton–proton collisions at the same center-of-mass energy which shows their similar thermodynamic nature.
Some geometric obstructions to warped product immersions in locally conformal Kaehler space forms
Authors: Shahid Mohd Hasan , Aslam Mohammed , Uddin Siraj
Published: August 2021

Being motivated by a well-known Nash’s embedding theorem, Chen introduced a method to discover the relationship for the extrinsic invariants controlled by the intrinsic one. In this paper, we extend Chen’s inequality for the intrinsic and extrinsic invariants for pointwise bi-slant warped products in locally conformal Kaehler space forms with quarter-symmetric and semi-symmetric connections. The equality case of the inequality is also investigated. Several applications of the inequality are given. Furthermore, we provide two non-trivial examples of such immersions.
Levi-Civita connections for a class of noncommutative minimal surfaces
Authors: Arnlind Joakim
Published: August 2021

In this paper, we study connections on hermitian modules, and show that metric connections exist on regular hermitian modules; i.e. finitely generated projective modules together with a non-singular hermitian form. In addition, we develop an index calculus for such modules, and provide a characterization in terms of the existence of a pseudo-inverse of the matrix representing the hermitian form with respect to a set of generators. As a first illustration of the above concepts, we find metric connections on the fuzzy sphere. Finally, the framework is applied to a class of noncommutative minimal surfaces, for which there is a natural concept of torsion, and we prove that there exist metric and torsion free connections for every minimal surface in this class.
Comparing entropy inspired holographic dark energy models through statefinder hierarchy and growth rate of perturbations
Authors: Kumar Mukesh , Dubey Vipin Chandra , Sharma Umesh Kumar
Published: August 2021

In this paper, we have investigated some recently proposed entropy-based versions of various HDE models, namely, the TADE, THDE, RHDE and SMHDE for different values of model parameter [Formula: see text] with the help of two diagnostic tools, in the context of a flat Friedmann–Lema[Formula: see text]tre–Robertson–Walker Universe. The statefinder hierarchy is the first diagnostic tool, by which we examine these DE models. The evolution of statefinder hierarchy parameters [Formula: see text], [Formula: see text] [Formula: see text], [Formula: see text] has been investigated by plotting against redshift [Formula: see text]. The evolutionary trajectories of all the DE models approach the [Formula: see text]CDM model, except the TADE model for some values of [Formula: see text] at late time, are well discriminated with the [Formula: see text]CDM model at early time. To get more clear discrimination among the DE models at late time, we have used the CND, i.e. [Formula: see text][Formula: see text], where [Formula: see text] indicates the fractional growth parameter. The evolutionary trajectories of [Formula: see text] and [Formula: see text] show different characteristics and the departure from [Formula: see text]CDM could be well evaluated.
Yamabe and quasi-Yamabe solitons in paracontact metric manifolds
Authors: De Uday Chand , Suh Young Jin
Published: August 2021

The aim of this paper is to characterize paracontact metric manifolds admitting Yamabe and quasi-Yamabe solitons. Several results of such solitons are proved. In particular, we classify Yamabe and quasi-Yamabe solitons on [Formula: see text]-paracontact metric manifolds.
Viscous coupled fluids in terms of a log-corrected equation-of-state
Authors: Brevik I. , Myrzakulov K. , Timoshkin A. V. , Zhadyranova A.
Published: August 2021

In this paper, we consider a class of cosmological fluids that possess properties analogous to those of crystalline solids undergoing isotropic deformations. Our research is based on a modified log-corrected power-law equation of state in the presence of a bulk viscosity. This formalism represents a class of the so-called logotropic fluids, and allows explaining an accelerating late-time universe. In order to obtain a more detailed picture of its evolution, we add in our model a coupling of the log-corrected power-law fluid to dark matter, and study various interacting forms between them. We solve the system of equations for a modified log-power-law fluid coupled to dark matter, and obtain expressions for the log-corrected power-law energy density, and the energy density for dark matter. A comparative analysis is made with the model of a nonviscous log-corrected power-law fluid without interaction with dark matter.
Black shells and naked shells
Authors: Pulido Walter , Quevedo Hernando
Published: August 2021

In this paper, we study the collapse of a thin dust shell from the point of view of the horizon dynamics. We identify the critical surfaces at which time and space coordinates interchange their roles and investigate their properties by using the formalism of trapped surfaces. We show the existence of marginally outer trapped surfaces that are associated with the presence of quasi-local horizons. A particular shell configuration that avoids the formation of horizons is interpreted as naked shell.
Deformation and stability analyses of a near-dam rocky slope and its potential landslide-generated wave threats
Authors: Chen Ming-liang , Yang Xing-guo , Qi Shun-chao , Li Hai-bo , Zhou Jia-wen
Published: September 2021

Occurrence of a reservoir landslide and its potential secondary hazards near a dam can result in significant losses and casualties, such as those that resulted from the Vajont landslide. In this study, a cataclinal rock slope in the Maoergai reservoir was taken as a case to study the characteristics of the gravitational deformation process and to analyse the potential threat. The stability of the rock slope was analysed using the limit equilibrium method, and the potential landslide movement and subsequent waves were simulated. Results indicated that lithology, geological structure, reservoir water-level changes and artificial activities all play an important role in large deformations of rock slopes that are characterized by a combination of bending–toppling and, principally, shear slip. Pre-calculations of potential threats indicated that the impact of a landslide wave would be greater at dead water levels than at the normal water level and could result in the blockage of the inlet to the water-diversion structure on the opposite right bank. These findings provide implications for the control of reservoir rock slopes: (i) serious attention should be paid to the influence of water on rock strength in the early investigation of geological disasters; and (ii) infiltration must be prevented during water-level rise.

Thematic collection:
This article is part of the Role of water in destabilizing slopes collection available at:
https://www.lyellcollection.org/cc/Role-of-water-in-destabilizing-slopes
Geometric Theorems and Application of the DOF Analysis of the Workpiece Based on the Constraint Normal Line
Authors: Luo Guojun , Wang Xiaohui , Yan Xianguo
Published: September 2021

Aiming at the problem of judging the degree of freedom (DOF) of the workpiece in the fixture by experience, it is difficult to adapt to the analysis of the DOF of some singular workpieces. The workpiece and the fixture are used as rigid bodies, and the workpiece is allowed to move in the plane or space under the constraints of the fixture positioning point, and a set of geometric theorems for judging the DOF and overconstraint of the workpiece can be derived according to the difference in the position of the instantaneous center of the workpiece speed. The judgment of the DOF and overconstraint of the workpiece is abstracted into rules with universal meaning, which effectively overcomes the limitations of existing methods. The research results show that (1) the DOF and overconstraint of the workpiece in the fixture depend entirely on the number of positioning normal lines of the workpiece and their geometric relationship; (2) the necessary and sufficient condition for limiting the DOF of rotation of the workpiece around a certain axis is that the workpiece has a pair of parallel normal lines in the vertical plane of the axis. Using geometric theorems to judge the DOF of the workpiece is more rigorous, simple, and intuitive, which is convenient for computer‐aided judgment and the reasonable layout of the positioning points of the workpiece, which can effectively avoid the misjudgment of the DOF and unnecessary overpositioning when the complex workpiece is combined and positioned on different surfaces. Several examples are used to verify the accuracy of the method and correct unreasonable positioning schemes.
Approximations, Errors, and Misconceptions in the Use of Map Projections
Authors: Baselga Sergio , Olsen Michael J.
Published: August 2021

Global geodetic techniques currently can provide the user with worldwide millimeter accuracy. Preservation of this degree of accuracy in derived products is far from straightforward and may leave vast room for trouble in the different steps involved in the collection, storing, processing, analysis, and delivering of geospatial information. This paper is envisioned to serve as a guide for those utilizing map projections, in any possible form of application-cartography, GIS, remote sensing, photogrammetry, etc., to the common (and not so common) causes of error and misconception. This work also explores and questions the validity of some of approximations that are routinely implemented and quantifies the corresponding impact. These include the impact of neglecting meteorological corrections, reduction to ellipsoid and grid scale factors for distances, meridian convergence and arc-to-chord correction for angles, and mixing up with different frames and reference systems, height systems, or deceptively similar map projections. Correct indications are also given for accurately performing geospatial operations such as intersection of lines, determination of minimum point to line distance, and area determination for cadaster, which are often performed with suboptimal accuracy.
Enhanced Expression of miR‐34a Enhances Escherichia coli Lipopolysaccharide‐Mediated Endometritis by Targeting LGR4 to Activate the NF‐κB Pathway
Authors: Ma Xiaofei , Yin Baoyi , Guo Shuai , Umar Talha , Liu Junfeng , Wu Zhimin , Zhou Qingqing , Zahoor Arshad , Deng Ganzhen
Published: August 2021

Background. Persistent endometritis caused by bacterial infections has lethal effects on the reproductive performance of dairy cattle, which compromises animal welfare and delays or prevents pregnancy. The microRNA (miRNA) miR‐34 family plays a pivotal role in the inflammatory process; however, the precise mechanism of miR‐34a in endometritis has not been thoroughly elucidated to date. Methods. In this study, the endometrium of cows diagnosed with endometritis was harvested for bacterial culture and Gram staining to evaluate bacterial contamination of the uterus. Based on this, a bovine endometrial epithelial cell (BEND) inflammation model and a mouse model stimulated with lipopolysaccharide (LPS) in vitro and in vivo were constructed. Cell viability was assessed by CCK‐8, trypan blue staining, and flow cytometry. H&E was applied to histopathological analysis. Immunohistochemical, immunofluorescence, qRT‐PCR, and western blot assays were performed to measure the mRNA and protein expression of relevant genes. Online databases, plasmid construction, and dual‐luciferase reporter gene assays were used to predict and validate the interaction between miR‐34a and its target gene LGR4. Finally, mice were injected vaginally with a local antagomir to validate the role of miR‐34a in murine uterine inflammation. Results. In this study, we observed that Gram‐negative bacteria, represented by Escherichia coli, are the predominant pathogenic agents responsible for the recurrent occurrence of endometritis in dairy cows. Further, miR‐34a was found to repress the expression of LGR4 by targeting the 3 ′ untranslated region (3 ′UTR) of LGR4. miR‐34a was upregulated in bovine uterine tissues and bovine endometrial epithelial cells stimulated with LPS. miR‐34a induced the release of the proinflammatory cytokines IL‐1β, IL‐6, and TNF‐α by activating the phosphorylation of NF‐κB p65. Furthermore, IL‐1β upregulated miR‐34a transcription and downregulated LGR4 expression in an IL‐1β‐dependent manner. Conclusions. Taken together, our study confirmed that miR‐34a is regulated by IL‐1β and suppresses the level of the LGR4 3 ′UTR, which in turn exacerbates the inflammatory response. Thus, the knockdown of miR‐34a might be a new direction for the treatment of endometritis.
[Retracted] Effects of Different Intervention Time Points of Early Rehabilitation on Patients with Acute Ischemic Stroke: A Single‐Center, Randomized Control Study
Authors: Liu LiLi , Lu YanQin , Bi QianQian , Fu Wang , Zhou XiaoYu , Wang Jue
Published: August 2021

Objective. To investigate effects of different intervention time points of early rehabilitation on patients with acute ischemic stroke. Methods. We enrolled patients diagnosed with acute ischemic stroke in our hospital’s rehabilitation ward from November 2013 to December 2015. Patients were randomly assigned to an ultraearly rehabilitation program (started within 72 hours of onset) or an early rehabilitation program (started from 72 hours to 7 days after onset). The efficacy was assessed by the NIH Stroke Scale (NIHSS) International, Barthel Index, and Fugl‐Meyer Assessment at one and three months after rehabilitation. Data were analyzed by variance analysis of two‐factor repeated measurement. Covariance analysis was used to adjust confounding factors for the determination of statistical differences. Results. 41 patients were enrolled in the ultraearly rehabilitation group, while 45 patients were in the early rehabilitation group. There were no differences between the two groups at baseline data. Compared with the early rehabilitation group, patients in the ultraearly rehabilitation group have significantly improved NIHSS score, BMI score, and FMA score at one month and three months (P < 0.001). After adjusting for confounding factors (gender, age, severity of NIHSS score, location of stroke, hypertension, diabetes, atrial fibrillation, and coronary heart disease), the significant difference still existed between the two groups at one month and three months (P < 0.001). Conclusion. Our study indicated a higher efficacy in the ultraearly rehabilitation group than the early rehabilitation group. The result suggests an important practical significance in favor of the clinical treatment of stroke.
Dynamic Group Recommendation Algorithm Based on Member Activity Level
Authors: Jia Junjie , Yao Yewang , Lei Zhipeng , Liu Pengtao
Published: August 2021

The rapid development of social networks has led to an increased desire for group entertainment consumption, making the study of group recommender systems a hotspot. Existing group recommender systems focus too much on member preferences and ignore the impact of member activity level on recommendation results. To this end, a dynamic group recommendation algorithm based on the activity level of members is proposed. Firstly, the algorithm predicts the unknown preferences of members using a time-series-oriented rating prediction model. Secondly, considering the dynamic change of member activity level, the group profile is generated by designing a sliding time window to investigate the recent activity level of each member in the group at the recommended moment, and preference is aggregated based on the recent activity level of members. Finally, the group recommendations are generated based on the group profile. The experimental results show that the algorithm in this paper achieves a better recommendation result.
A Rare Case Diagnosed by Videothoracoscopic Lung Biopsy: Diffuse Pulmonary Meningotheliomatosis
Authors: Dzian Anton , Malík Marek , Hamada Ľuboš , Mičák Jozef , Gregorová Ivana , Košturiaková Gabriela
Published: August 2021

Diffuse pulmonary meningotheliomatosis (DPM) is reported as a diffuse parenchymal lung disease characterized by disseminating small asymptomatic nodules. These lesions are often detected incidentally as microscopic findings in lung specimens or autopsies examined by a pathologist. We report a case of a 60-year-old male asymptomatic patient presenting with multiple bilateral pulmonary nodules on high-resolution computed tomography and diagnosed by videothoracoscopic surgery. Differential diagnosis of patients presenting with diffuse indeterminate nodules is very important. Definitive diagnosis of DPM requires histopathology and most often videothoracoscopic lung biopsy.