bluuebunny/crossref_metadata_2025 huggingface dataset:
Computing Shintani domains
Authors: Capuñay Alex
Published: October 2023

For a number field [Formula: see text] having at least one embedding into the real numbers we give an algorithm to obtain a Shintani domain for the action of the totally positive units of [Formula: see text] under its geometric embedding. Our algorithm modifies a known signed, or virtual, fundamental domain until it becomes a true one. We examine the results of extensive runs of our algorithm for cubic, quartic and quintic number fields. We also give some data for totally real sextic fields where our algorithm is still often practical.
Interlacing properties for zeros of a family of modular forms
Authors: Frendreiss William , Gao Jennifer , Lei Austin , Woodall Amy , Xue Hui , Zhu Daozhou
Published: October 2023

Getz presented a family of level one modular forms [Formula: see text] for which all zeros lie on the unit circle in the fundamental domain. Expanding on work from Nozaki, Griffin et al., and Saha and Saradha, we show that the non-elliptic zeros of these [Formula: see text] satisfy two interlacing properties: standard interlacing, where the zeros of [Formula: see text] and [Formula: see text] alternate if and only if [Formula: see text] for sufficiently large [Formula: see text]; and Stieltjes interlacing, where for [Formula: see text] large enough, between any two zeros of [Formula: see text], there is a zero of [Formula: see text].
On the jth smallest modulus of a covering system with distinct moduli
Authors: Klein Jonah , Koukoulopoulos Dimitris , Lemieux Simon
Published: October 2023

Covering systems were introduced by Erdős in 1950. In the same article where he introduced them, he asked if the minimum modulus of a covering system with distinct moduli is bounded. In 2015, Hough answered affirmatively this long standing question. In 2022, Balister et al. gave a simpler and more versatile proof of Hough’s result. Building upon their work, we show that there exists some absolute constant [Formula: see text] such that the [Formula: see text]th smallest modulus of a minimal covering system with distinct moduli is [Formula: see text].
On the X-coordinates of Pell equations X2 − dY2 = ±1 as difference of two Fibonacci numbers
Authors: Gómez Carlos A. , Rihane Salah Eddine , Togbé Alain
Published: October 2023

In this paper, we show that there is at most one value of the positive integer [Formula: see text] participating in the Pell equation [Formula: see text], which is a difference of two Fibonacci numbers.
On 5ψ5 identities of Bailey
Authors: Dhar Aritram
Published: October 2023

In this paper, we provide proofs of two [Formula: see text] summation formulas of Bailey using a [Formula: see text] identity of Carlitz. We show that in the limiting case, the two [Formula: see text] identities give rise to two [Formula: see text] summation formulas of Bailey. Finally, we prove the two [Formula: see text] identities using a technique initially used by Ismail to prove Ramanujan’s [Formula: see text] summation formula and later by Ismail and Askey to prove Bailey’s very-well-poised [Formula: see text] sum.
Metrical properties for functions of consecutive multiple partial quotients in continued fractions
Authors: Zhang Yuqing
Published: October 2023

Recently, the growth of the products of consecutive partial quotients [Formula: see text] in the continued fraction expansion of a real number [Formula: see text] was studied in connections with improvements to Dirichlet’s theorem. In this paper, for a non-decreasing positive measurable function [Formula: see text] and a function [Formula: see text], we consider the set [Formula: see text], and obtain its Lebesgue measure [Formula: see text]). As an application of our result, we reprove a theorem of Bakhtawar–Hussain–Kleinbock–Wang. We also consider the case when [Formula: see text].
On 12-congruences of elliptic curves
Authors: Frengley Sam
Published: October 2023

We construct infinite families of pairs of (geometrically non-isogenous) elliptic curves defined over [Formula: see text] with [Formula: see text]-torsion subgroups that are isomorphic as Galois modules. This extends previous work of Chen and Fisher where it is assumed that the underlying isomorphism of [Formula: see text]-torsion subgroups respects the Weil pairing. Our approach is to compute explicit birational models for the modular diagonal quotient surfaces which parametrize such pairs of elliptic curves.

A key ingredient in the proof is to construct simple (algebraic) conditions for the [Formula: see text], [Formula: see text] or [Formula: see text]-torsion subgroups of a pair of elliptic curves to be isomorphic as Galois modules. These conditions are given in terms of the [Formula: see text]-invariants of the pair of elliptic curves.
On some discrete mean values of higher derivatives of Hardy’s Z-function
Authors: Kobayashi Hirotaka
Published: October 2023

Yıldırım obtained an asymptotic formula of the discrete moment of [Formula: see text] over the zero of the higher derivatives of Hardy’s [Formula: see text]-function. We give a generalization of his result on Hardy’s [Formula: see text]-function.
A note on the size of iterated sumsets in ℤd
Authors: Vrećica Ilija
Published: October 2023

In a recent paper by Curran and Goldmakher, the cardinality of [Formula: see text]-fold sumsets [Formula: see text] was given when [Formula: see text] has [Formula: see text] elements. In this paper we provide a different method for doing this and obtain a more general result.

We also obtain an upper bound for the value of [Formula: see text] when [Formula: see text] is a set of [Formula: see text] elements with simplicial hull.
A Dirichlet series related to the error term in the Prime Number Theorem
Authors: Elma Ertan
Published: October 2023

For a natural number [Formula: see text], let [Formula: see text] where the sum runs over the nontrivial zeros of the Riemann zeta function. For a primitive Dirichlet character [Formula: see text] modulo [Formula: see text], we define [Formula: see text] for [Formula: see text] and obtain the meromorphic continuation of the function [Formula: see text] to the region [Formula: see text]. Our main result indicates that the poles of [Formula: see text] in the region [Formula: see text], if they exist, are related to the zeros of many Dirichlet [Formula: see text]-functions in the same region.
Locally cyclic extensions with Galois group GL2(p)
Authors: Arias-de-Reyna Sara , König Joachim
Published: October 2023

Using Galois representations attached to elliptic curves, we construct Galois extensions of [Formula: see text] with group [Formula: see text] in which all decomposition groups are cyclic. This is the first such realization for all primes [Formula: see text].
A two-parametric family of high rank Mordell curves
Authors: Reynya Mikhail A.
Published: October 2023

We present an elementary construction of an explicit two-parametric family of elliptic curves over [Formula: see text] of the form [Formula: see text] such that the rank of each member of the family is at least seven. The main new ingredient is Ramanujan’s identity for sums of rational cubes.
On some sums involving the integral part function
Authors: Liu Kui , Wu Jie , Yang Zhishan
Published: October 2023

Denote by [Formula: see text], [Formula: see text] and [Formula: see text] the number of representations of [Formula: see text] as a product of [Formula: see text] natural numbers, the number of distinct prime factors of [Formula: see text] and the characteristic function of the square-free integers, respectively. Let [Formula: see text] be the integral part of real number [Formula: see text]. For [Formula: see text], we prove that [Formula: see text] for [Formula: see text], where [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] is an arbitrarily small positive number. These improve the corresponding results of Bordellès.
Short interval results for powerfree polynomials over finite fields
Authors: Kumchev Angel V. , McNew Nathan G. , Park Ariana
Published: October 2023

Let [Formula: see text] be an integer and [Formula: see text] be a finite field with [Formula: see text] elements. We prove several results on the distribution in short intervals of polynomials in [Formula: see text] that are not divisible by the [Formula: see text]th power of any non-constant polynomial. Our main result generalizes a recent theorem by Carmon and Entin on the distribution of squarefree polynomials to all [Formula: see text]. We also develop polynomial versions of the classical techniques used to study gaps between [Formula: see text]-free integers in [Formula: see text]. We apply these techniques to obtain analogs in [Formula: see text] of some classical theorems on the distribution of [Formula: see text]-free integers. The latter results complement the main theorem in the case when the degrees of the polynomials are of moderate size.
Deep learning-based inpainting of saturation artifacts in optical coherence tomography images
Authors: Hu Muyun , Yuan Zhuoqun , Yang Di , Zhao Jingzhu , Liang Yanmei
Published: October 2023

Limited by the dynamic range of the detector, saturation artifacts usually occur in optical coherence tomography (OCT) imaging for high scattering media. The available methods are difficult to remove saturation artifacts and restore texture completely in OCT images. We proposed a deep learning-based inpainting method of saturation artifacts in this paper. The generation mechanism of saturation artifacts was analyzed, and experimental and simulated datasets were built based on the mechanism. Enhanced super-resolution generative adversarial networks were trained by the clear–saturated phantom image pairs. The perfect reconstructed results of experimental zebrafish and thyroid OCT images proved its feasibility, strong generalization, and robustness.
Gates joint locally connected network for accurate and robust reconstruction in optical molecular tomography
Authors: Zhao Minghua , Xiao Yahui , Zhang Jiaqi , Cao Xin , Wang Lin
Published: October 2023

Optical molecular tomography (OMT) is a potential pre-clinical molecular imaging technique with applications in a variety of biomedical areas, which can provide non-invasive quantitative three-dimensional (3D) information regarding tumor distribution in living animals. The construction of optical transmission models and the application of reconstruction algorithms in traditional model-based reconstruction processes have affected the reconstruction results, resulting in problems such as low accuracy, poor robustness, and long-time consumption. Here, a gates joint locally connected network (GLCN) method is proposed by establishing the mapping relationship between the inside source distribution and the photon density on surface directly, thus avoiding the extra time consumption caused by iteration and the reconstruction errors caused by model inaccuracy. Moreover, gates module was composed of the concatenation and multiplication operators of three different gates. It was embedded into the network aiming at remembering input surface photon density over a period and allowing the network to capture neurons connected to the true source selectively by controlling three different gates. To evaluate the performance of the proposed method, numerical simulations were conducted, whose results demonstrated good performance in terms of reconstruction positioning accuracy and robustness.
On graded (1,r)-ideals
Authors: Guennach Nassima , Mahdou Najib , Teki̇r Ünsal , Koç Suat
Published: October 2023

Let [Formula: see text] be a group with identity element [Formula: see text] and [Formula: see text] be a commutative [Formula: see text]-graded ring with nonzero unity [Formula: see text]. In this paper, we introduce the graded version of [Formula: see text]-ideals which is a generalization of graded [Formula: see text]-ideals. A proper graded ideal [Formula: see text] of [Formula: see text] is said to be a graded [Formula: see text]-ideal if whenever [Formula: see text] for some nonunits homogeneous elements [Formula: see text], then either [Formula: see text] or [Formula: see text]. We investigate some basic properties of graded [Formula: see text]-ideals. We show that if [Formula: see text] admits a graded [Formula: see text]-ideal that is not a graded [Formula: see text]-ideal, then [Formula: see text] is a [Formula: see text]-graded local ring. Also, we give a method to construct graded [Formula: see text]-ideals that are not graded [Formula: see text]-ideals. Furthermore, we prove that [Formula: see text] is a graded total quotient ring if and only if every proper graded ideal of [Formula: see text] is graded [Formula: see text]-ideal and also we present a counterpart of prime avoidance lemma for graded [Formula: see text]-ideals. Finally, an idea is given about some graded [Formula: see text]-ideals of the ring of fractions and the idealization.
Exponential stability of Lord Shulman thermoelastic system with porous damping and distributed delay term
Authors: Bouzettouta Lamine , Boulkheloua Chaima , Khochemane Houssem Eddine , Karek Widad
Published: October 2023

In this paper, we consider a one-dimensional Lord–Shulman thermoelastic system [C. Cattaneo, On a form of heat equation which eliminates the paradox of instantaneous propagation, C. R. Acad. Sci. Paris 247 (1958) 431–433] with porous damping and distributed delay term acting on the porous equation. Under suitable assumptions on the weight of distributed delay, we establish the well posedness of the system by using semigroup theory and we show that the dissipations due to thermal effects with porous damping are strong enough to stabilise the system exponentially, independently of the wave speeds of the system.
ANALYZING BANKS’ PERFORMANCE DURING THE RECENT BREAKDOWNS. WHAT WERE THE MAIN DRIVERS?
Authors: PACELLI VINCENZO , PAMPURINI FRANCESCA , QUARANTA ANNA GRAZIA
Published: October 2023

We observe the main efficiency drivers of European Banking Groups after the burst of the Global Financial Crisis. This analysis is a live issue within the studies in the field of intermediation. The observed period (2010–2021) is emblematic of the complexity of the financial market in the last two decades. The efficiency levels derive from a stochastic frontier approach; a k-means cluster analysis distinguishes the units into three homogeneous groups, so that the main determinants of the higher level of efficiency can be identified. They are linked to a particular business model, specific managerial choices, costs rationalization and liquidity optimization.
Development of a Mission-Tailored Tail-Sitter MAV
Authors: Fernandez Luiz F. T. , Bronz Murat , Bartoli Nathalie , Lefebvre Thierry
Published: October 2023

Vertical takeoff and landing (VTOL) vehicles are among the most versatile UAVs, appropriate for various missions. Given that there are still open challenges regarding the VTOL design, this paper presents the full development and test cycle of a tail-sitter. IMAV 2022 competition rules were used to define the mission. A multidisciplinary design and optimization strategy was defined with the goal of maximizing competition score considering design, manufacturing, and competition constraints. The resulting vehicle was designed to fly at 18[Formula: see text]m/s while carrying 200[Formula: see text]g of payload with a total weight of approximately 720[Formula: see text]g. It flew for roughly 13 min at IMAV2022, helping its team to achieve 1st place at the “Package delivery challenge”. Further flight tests revealed the ultimate endurance performance as 18[Formula: see text]min.
Mindscape and Its Effect on Cities’ Sustainability: A Case Study of Bronzeville Neighborhood — Chicago
Authors: MOAZZENI KHORASGANI Ali , VILLALOBOS Maria H.
Published: October 2023

Neighborhoods and urban contexts are full of potential hidden inside them in an intangible form and can be used for their development and sustainability. Therefore, studying, discovering, and using them can help revive worn and historical textures. These mental factors include things not in the city’s outward appearance but in its heart and memory. The mindscape of the city includes everything that has meaning for its residents. Collective memories lead to strengthening their sense of belonging. The sense of belonging and collective memory is one factor that promotes social participation in the neighborhood and urban contexts. Social involvement is an efficient factor in facilitating neighborhood management, attracting investment, and helping environmental issues. Finally, it plays an influential role in sustaining life in urban contexts. Despite the plans that have been made to promote the sense of collective memory and increase the sense of belonging to the place, Chicago’s Bronzeville neighborhood has yet to achieve its growth and prosperity as in the past. Therefore, this paper focuses on studying how mindscape can help the sustainability and development of cities. The research method in this paper is based on document study, the review of documents related to prominent research in the fields of objective landscape, place identity, sense of place, and surface, and was carried out by descriptive-analytical research method. The method of collecting information is in two forms: documentary and field. Field information will be collected through two questionnaires (see Appendices A and B) from residents and experts. In this research, after reviewing and studying the documents and analyzing the field data, we present the proposed model of the influential factors of the mental landscape in the sustainability of urban contexts and draw the following conclusions: The concept of the mindscape holds significant importance in the context of creating sustainable cities and communities. It encompasses belonging, collective memories, and factors promoting social participation. Safeguarding and nurturing collective memory, the sense of place, belonging, and social participation are crucial in sustaining the mindscape and ensuring the long-term well-being of urban environments. By prioritizing these elements, cities and communities can foster a stronger connection between residents and their surroundings, resulting in a more vibrant and resilient urban fabric.
A High-Order Immersed Moving Boundary Method Using Ghost Points and Characteristics for Acoustics
Authors: Bocquet Constance , Desjouy Cyril , Gabard Gwénaël
Published: October 2023

Realistic acoustic problems often involve interactions between arbitrary-shaped moving objects at the interface with a fluid domain. The present work aims at developing numerical methods to take into account moving boundaries for acoustic problems, with a high order of convergence. The reference problem considered in this work is the solution of the non-linear Euler equations by a finite-difference time-domain method, describing the formation of one-dimensional waves created by a moving piston. The most suitable class of methods to solve this type of problem in the case of complex moving boundaries is the ghost-point method for sharp interface with 4th order reconstruction. 1 In order to accurately formulate the immersed boundaries with ghost points, the boundary conditions are formulated in terms of characteristic waves of the non-linear equations. The proposed approach is also extended to represent moving boundaries with a prescribed acoustic impedance. This is achieved by coupling a time-domain acoustic impedance model to the immersed boundary technique. The method is also applied to a two-dimensional example, where an acoustic pulse is reflected by a moving wall.
Extracts of Selected South African Medicinal Plants Mitigate Virulence Factors in Multidrug‐Resistant Strains of Klebsiella pneumoniae
Authors: Adeosun Idowu J. , Baloyi Itumeleng T. , Cosa Sekelwa
Published: October 2023

The emergence of multidrug‐resistant (MDR) Klebsiella pneumoniae remains a global health threat due to its alarming rates of becoming resistant to antibiotics. Therefore, identifying plant‐based treatment options to target this pathogen’s virulence factors is a priority. This study examined the antivirulence activities of twelve plant extracts obtained from three South African medicinal plants (Lippia javanica, Carpobrotus dimidiatus, and Helichrysum populifolium) against carbapenem‐resistant (CBR) and extended‐spectrum beta‐lactamase (ESBL) positive K. pneumoniae strains. The plant extracts (ethyl acetate, dichloromethane, methanol, and water) were validated for their inhibitory activities against bacterial growth and virulence factors such as biofilm formation, exopolysaccharide (EPS) production, curli expression, and hypermucoviscosity. The potent extract on K. pneumoniae biofilm was observed with a scanning electron microscope (SEM), while exopolysaccharide topography and surface parameters were observed using atomic force microscopy (AFM). Chemical profiling of the potent extract in vitro was analysed using liquid chromatography‐mass spectrometry (LC‐MS). Results revealed a noteworthy minimum inhibitory concentration (MIC) value for the C. dimidiatus dichloromethane extract at 0.78 mg/mL on CBR‐ K. pneumoniae. L. javanica (ethyl acetate) showed the highest cell attachment inhibition (67.25%) for CBR‐ K. pneumoniae. SEM correlated the in-vitro findings, evidenced by a significant alteration of the biofilm architecture. The highest EPS reduction of 34.18% was also noted for L. javanica (ethyl acetate) and correlated by noticeable changes observed using AFM. L. javanica (ethyl acetate) further reduced hypermucoviscosity to the least length mucoid string (1 mm‐2 mm) at 1.00 mg/mL on both strains. C. dimidiatus (aqueous) showed biofilm inhibition of 45.91% for the ESBL‐positive K. pneumoniae and inhibited curli expression at 0.50 mg/mL in both K. pneumoniae strains as observed for H. populifolium (aqueous) extract. Chemical profiling of L. javanica (ethyl acetate), C. dimidiatus (aqueous), and H. populifolium (aqueous) identified diterpene (10.29%), hydroxy‐dimethoxyflavone (10.24%), and 4,5‐dicaffeoylquinic acid (13.41%), respectively, as dominant compounds. Overall, the ethyl acetate extract of L. javanica revealed potent antivirulence properties against the studied MDR K. pneumoniae strains. Hence, it is a promising medicinal plant that can be investigated further to develop alternative therapy for managing K. pneumoniae‐associated infections.
Real-Time Predictive Energy-Saving Control for Electric Vehicle Based on Road Slope Prediction
Authors: Wu Dongmei , Lin Zhenfeng , Du Changqing , Li Yang
Published: October 2023

Predictive energy-saving control (PEC) is aimed at reducing energy consumption by designing the vehicle speed while considering future road and traffic information. In particular, the slope of the road ahead is necessary and critical for PEC. This paper proposes a road slope prediction method for production vehicles that uses the nonlinear autoregressive (NAR) neural network model based on road slope sensors. To adaptively balance the energy savings and trip time, this paper proposed a real-time variable weight PEC method for a four-wheel-drive (4WD) intelligent electric vehicle. The weight coefficients are automatically changed according to the characteristics of the road slope, where the vehicle energy-saving rate on the steep downhill road can be maximized. The results of real-time simulation on the dSPACE platform indicated that the road slope predictive model can be run in real time and adapted to changes in road slope and speed. The root mean square error (RMSE) of the predictive results is 0.3063. On a steep downhill road, the energy-saving rate of the proposed PEC method can reach 30.87% at a small expense of time of 3.75%. On uphill and flat roads, energy can be saved by 6.35% at a time cost of 3.0%. Compared with the PEC with constant weight factors, the two control objectives of energy savings and traveling time can be better balanced on various types of roads.
Mechanism of Permanganate Biosorption by Fermentation Biowaste
Authors: Kim Namgyu , Lee Sang-Hoon , Yang Hanui , Park Donghee
Published: October 2023

Biosorptive treatment of industrial wastewater contaminated with heavy metals has been recognized as one of the most effective green tools, competing with traditional physical/chemical treatment processes. This study delves into the detailed investigation of the biosorbent prepared from fermentation biowaste, particularly focusing on the mechanism behind permanganate (Mn(VII)) removal. Various parameters including pH, biosorbent dosage, initial concentration, and temperature were examined. Among these factors, solution pH emerged as the most crucial in removing Mn(VII) using the biosorbent. The significant removal of Mn(VII) was attributed to both reduction and adsorption, as confirmed by X-ray photoelectron spectroscopy. Depending on the experimental conditions, the removal of Mn(VII) was influenced not only by simple adsorption but also by oxidation-reduction and precipitation processes. This study not only advances our understanding of biosorptive treatment but also highlights the promising potential of fermentation biowaste-based biosorbents for effective Mn(VII) removal.
Prevalence and Antimicrobial Susceptibility Profile of Salmonella and Shigella among Diarrheic Patients Attending Selected Health Facilities in Addis Ababa, Ethiopia
Authors: Ararsa Tiruneh , Wolde Deneke , Alemayehu Haile , Bizuwork Ketema , Eguale Tadesse
Published: October 2023

Diarrhea is one of the important public health problems in developing countries. Salmonella and Shigella species are the major bacterial causal agents of diarrhea. The increasing burden of antimicrobial resistance is posing difficulty in the treatment of these pathogens. This study aimed to assess the occurrence of Salmonella and Shigella in the feces of diarrheic patients receiving health services in Addis Ababa, Ethiopia, and to determine their antimicrobial susceptibility profile. A cross-sectional study involving 13 health centers was conducted where 428 diarrheic patients were recruited. Standard microbiology techniques were used to isolate Salmonella and Shigella from stool samples. In addition, Salmonella isolates were confirmed by polymerase chain reaction (PCR). The Kirby–Bauer disc diffusion method was employed to assess susceptibility to 11 antimicrobials for each of the Salmonella and Shigella isolates. The prevalence of Salmonella and Shigella spp. among diarrheic patients was 8.4%; n = 36 and 5.6%; n = 24, respectively. Thirty (83.3%) of Salmonella isolates were susceptible to all antimicrobials tested, whereas 4 (10.8%) of isolates were resistant to 2 or more antimicrobials and 2 (5.6%) were multidrug resistant. Resistance to ampicillin was recorded in only one (2.7%) of Salmonella isolates; however, resistance to ampicillin was recorded in 12 (50%) of the Shigella isolates. Half of the Shigella isolates (n = 12) were resistant to 2 or more antimicrobials while 5 (20.8%) of them were resistant to 3 or more antimicrobials. The overall rate of resistance to antimicrobials was more common in Shigella compared to Salmonella isolates. In conclusion, Salmonella and Shigella were isolated from the feces of diarrheic patients, with a higher rate of antimicrobial resistance in Shigella isolates, which could make the treatment of shigellosis challenging. Therefore, increasing hygienic practices during food preparation to reduce the burden of Salmonella and Shigella infection and prudent use of antimicrobials are recommended to limit the spread of antimicrobial resistant strains.
Enhancing the Efficiency of Inverted Organic Solar Cells with Treatment Techniques: Numerical and Experimental Study
Authors: Raeyani Davoud , Asgari Asghar
Published: October 2023

The combination of UV-ozone and Al-doping enhancements in the ZnO ETL layer was studied for fullerene-based (P3HT:PCBM) and nonfullerene-based (J71:m-ITIC) solar cells. The study focused on morphological and interfacial defects and their relation to the electrical and optical properties of different Al-doped ZnO layers. The study also investigated the surface recombination velocity at the interface of the ZnO/active layer, as well as the carrier lifetime and diffusion length of the active layer theoretically. The most effective Al-doping dosage was 3% for P3HT:PCBM and 2% for J71:m-ITIC, attributed to the varying sensitivity of the active layer materials to morphological enhancement.
Vibration Analysis of Traction Drive System Components Based on the Field Test for High-Speed Train
Authors: Wu Pingbo , Song Chunyuan , Wang Xun , Qu Sheng , Wu Hao
Published: October 2023

The traction drive system of a high-speed train is the key subsystem of a high-speed train, which controls the driving and braking of the train through electromechanical coupling, and determines the running speed, power quality, and comfort of the train. The traction drive system is subjected to many internal and external excitation sources and frequency bandwidth, and the dynamic response and dynamic characteristics of the system are extremely complex. The results of the traction motor field vibration test showed that 100 Hz vibration frequency occurred during traction and braking of high-speed trains when the inverter output voltage frequency was close to 100 Hz, and its vibration amplitude was higher than other frequency bands. When traction power was cut-off, the 100 Hz frequency was not significant. Through simulation analysis of fatigue damage, it was found that 100 Hz DC-link voltage pulsation would aggravate the fatigue damage of the motor hanger. The line vibration test and bench test of the gearbox showed that there was a natural frequency of the gearbox at about 2500 Hz, when the meshing frequency was close to it. Thus, the resonance characteristic became significant.
Effects of Conservative Oxygen Therapy versus Conventional Oxygen Therapy on the Mortality in ICU Patients: A Meta-Analysis
Authors: Jiang Xinyu , Qiu Dong
Published: October 2023

Objective. To compare the effects of conservative oxygen therapy and conventional oxygen therapy on the mortality of critically ill patients in ICU. Methods. Searching for randomized controlled clinical trials (RCT) on the effect of conservative oxygen therapy and conventional oxygen therapy on the mortality of critically ill patients in computer databases, including PubMed, Embase, Cochrane Library, CNKI, VIP, and Wanfang, with postdate before August 2022. We have two researchers evaluating the quality of the literature included and extracting data as per the inclusion and exclusion criteria and then analyzed it with RevMan 5.4 statistical software. Primary outcome included short-term mortality (28-day mortality or ICU mortality); secondary outcome included 90-day mortality, ICU length of stay, hospital length of stay, incidence of new organ dysfunction in ICU, incidence of new infection in ICU, and incidence of ICUAW. Results. A total of 5779 subjects were included in 10 articles, including 2886 in the conservative oxygen therapy group and 2893 in the conventional oxygen therapy group. The meta-analysis showed that conservative oxygen therapy had an advantage over conventional oxygen therapy in terms of short-term mortality (

P
=
0.03

). Subgroup analysis based on different conservative oxygen targets showed that this advantage was statistically significant when the target is set above 90% (RR = 0.76, 95% CI = 0.62∼0.94,

P
=
0.01

), while there was no significant difference between conservative oxygen therapy and conventional oxygen therapy when the target is set below 90% (RR = 0.95, 95% CI = 0.79∼1.16,

P
=
0.63

). In addition, in terms of the incidence of new infections in the ICU (

P
=
0.03

) and the incidence of ICUAW (

P
=
0.03

), conservative oxygen therapy also had advantages over conventional oxygen therapy, and the difference was statistically significant. But in terms of 90-day mortality (

P
=
0.61

), ICU length of stay (

P
=
0.96

), hospital length of stay (

P
=
0.47

), and incidence of new organ dysfunction in ICU (

P
=
0.61

), there was no significant difference between conservative oxygen therapy and conventional oxygen therapy. Conclusion. Compared with conventional oxygen therapy, conservative oxygen therapy can reduce the short-term mortality of severe patients, especially when the conservative oxygen therapy target is set above 90%. And it can also reduce the incidence of ICU new infections and ICUAW, while having no effect on 90-day mortality, ICU length of stay, and hospital length of stay.
Comparative Analysis of Different Control Strategies for Relift Luo Converter
Authors: Banupriya R. , Nagarajan R. , Kalis K. R. N.
Published: October 2023

Dual-output DC to DC converters have drawn attention in the domestic, automobile, and industrial domains. A dual-output converter usually provides a voltage step-down channel and a voltage step-up channel. Typically, an automobile needs a battery charging unit, a traction motor drive, and several other applications. A typical application may require two channels of DC output with a low-voltage (LV) channel and a high-voltage (HV) channel. While the generic boost-derived and quadratic boost-derived dual-output converters are available in the literature, this article focuses on the control aspects of a relift type Luo converter-derived dual-output converter (LDDOC). A solar photovoltaic (SPV) source is the main power, and it charges a battery. The LV loads may be connected across the battery, and the relift stage delivers a regulated 48 V output. The regulation of the 48 V output using a PI controller, a fuzzy logic controller, an ANN-based controller, and a sliding mode controller (SMC) has been studied using simulations. The simulations reveal that the sliding mode controller is advantageous because of meeting out the required performance, easy implementation, and low cost. An experimental setup has also been developed to verify the performance of the sliding mode controller for the regulation of the HV channel output voltage at 48 V.
Extensive Field Validations and Corresponding Numerical Investigations for a Cable Tension Estimation Method Based on Local Vibration Measurements
Authors: Chen Chien-Chou , Wu Wen-Hwa , Ko Yi-Pei , Lai Gwolong
Published: October 2023

To assess the applicability of the tension estimation method using local vibration measurements in a thorough manner, this research work is devoted to systematically investigate the appropriate covering ranges of measurements for different cables. Four cables of three cable-stayed bridges are deliberately chosen to cover a wide range of the cable slenderness parameter. Numerical analyses with finite element models and field validations with real measurements are conducted for these stay cables to demonstrate that the covering range of local measurements can be undoubtedly reduced with the increase of cable slenderness. For a relatively short cable with the slenderness parameter at the order of 4000, the adoption of 1/3 coverage is sufficient to keep a high-level accuracy with at most 1% of error. Besides, 1/4, 1/6, and 1/7 coverages are found adequate to maintain the same level of accuracy for longer cables with the slenderness parameter at the orders of 30000, 55000, and 80000, respectively. With the solid validations presented in the current study, the covering range of the cable for this simplified method employing local vibration measurements can be confidently reduced to greatly alleviate the expense and hard work of sensor installation near the high end.
Exploring the Impact of a Digital Counseling Tool on Family Caregivers: An Initial Program Theory Based on Realist Methodology
Authors: Clement Theresa , Gabl Katharina , Eppel-Meichlinger Jasmin , Wallner Martin , Mayer Hanna
Published: October 2023

Supporting family caregivers has been identified as a high-priority health goal worldwide. To reach this group, low-threshold, flexible, and accessible support services are needed that are individually adapted to the needs of the affected families. The newly developed digital counseling service “Alles Clara” intends to provide support for this group by connecting them with healthcare experts, allowing for professional and individual counseling at any time and place. To demonstrate the impact of Alles Clara and to be able to further develop and improve the service, it is to be evaluated. To uncover what works, how, under which conditions, and for whom, we drew on the realist evaluation methodology to devise an initial program theory. In this article, we describe the development of and present the initial program theory of Alles Clara. Internal program documents and guided individual interviews with stakeholders and counselors served as data sources to gradually develop a preliminary understanding of Alles Clara’s intended impact and modes of action in an iterative process. The initial program theory outlines central chains of events, mechanisms, and outcomes of the digital service. Family caregivers experience relief through expanding awareness, appreciation, trusting relationships, and reflection. For professionals, a new professional environment, a healthful culture, quality, and meaningfulness affect job satisfaction. Central to unfolding its mechanisms is that the digital counseling service enables an experience of “being seen” while “not being seen.” The results provide information about the impact of Alles Clara on both the target groups, identify possible areas for service improvement, and serve as a basis for evaluation and regular monitoring, especially, when it comes to the question of whether and how digital services can be supportive in the sense of a person-centred orientation of health care.
Bonos Verdes: Un elemento clave de las Finanzas Sostenibles
Authors: Romero Meza Rafael , Bravo Rodrigo
Published: October 2023

Hay un amplio consenso de que el planeta está sufriendo un grave daño por la acción de las actividades humanas. Por ejemplo, en su sitio web NASA (2021) estima que la temperatura promedio de la superficie del planeta ha aumento en aproximadamente 1,18 grados Celsius desde finales del siglo XIX. Continuar leyendo...
Blockchain y transparencia: Un nuevo horizonte para el sector público chileno
Authors: Escobar Arriagada Claudio , Millar Catarí
Published: October 2023

En los últimos años, Chile ha experimentado una creciente demanda ciudadana por mayor transparencia en el sector público, en medio de escándalos y percepciones de corrupción. La tecnología blockchain surge como un faro de esperanza, con el potencial de transformar la gestión de la información pública y restaurar la confianza ciudadana en las instituciones gubernamentales.Continuar leyendo...
COMPARATIVE ANALYSIS OF STOCK RETURNS OF ZOMBIE FIRMS AND BIST 30 FIRMS WITH STATISTICAL METHODS
Authors: HORASAN Mukadder
Published: October 2023

The concept of ‘zombie’ companies was first proposed by Kane in 1987. The three common features of these companies are listed as follows; high debt level, low profit rate and productive companies reduce their productivity. Zombie firms are defined as companies with persistently low profitability, high leverage, or negative equity capital. However, instead of defining a business as a zombie with single company data, it would be more accurate to look at bank and company level data that also show the lending relationships between credit institutions and corporate debtors. (Álvarez et al., 2023).

In our study, companies having negative equity capital for at least three consecutive years were considered zombies, whereas these companies were selected from the ISO 1000 industrial enterprises. Particular attention was paid to ensure these companies continued to be traded on BIST. Additionally, BIST 30 companies were analyzed and stock returns and statistical evaluations were also analyzed.
Revisiting the Bactrian and Gāndhārī Bilingual Inscriptions from Dasht-e Nāwūr
Authors: Palunčić Filip , Palunčić Daniella , Maharaj B.T.
Published: October 2023

The historically important Kushan trilingual inscriptions of Dasht-e Nāwūr are revisited. The readings and interpretations of the bilingual DN I (Bactrian)—DN IV (Gāndhārī) are presented. Through careful analysis of the photos, paper rubbings and latex moulds of DN I published by Gérard Fussman in 1974, a reading of lines 7–13 is proposed which shows further significant parallels with known Kushan-period Bactrian inscriptions, supplementing the decipherment of lines 1–6 by Nicholas Sims-Williams. Furthermore, a comprehensive reading of the Gāndhārī version DN IV in Kharoṣṭhī script is proposed, which presents a true bilingual with DN I and corroborates our reading of DN I. Based on our reading of the bilingual DN I–DN IV, the inscriptions commemorate the arrival of Vema Taktu to Dasht-e Nāwūr, located in the Ghaznī province of Afghanistan, in Vema’s fifteenth regnal year.
The consequences of trust and repression on the rise and fall of movements in authoritarian regimes
Authors: Sika Nadine
Published: October 2023

This article analyzes the relation between interpersonal trust, repression, mobilization, and demobilization in authoritarian regimes. Does interpersonal trust impact mobilization in authoritarian regimes? Does an authoritarian regime’s strategies of repression and cooptation fuel distrust among movement actors and consequently lead to demobilization? Through relying on qualitative analysis in Egypt in the aftermath of the January 2011 uprising, I argue that interpersonal trust plays a significant role in the mobilization process of opposition movements. Yet, when movement members’ interpersonal trust levels and mobilizational capacities are high, authoritarian regimes utilize excessive repressive strategies to fragment and demobilize them. However, repression is not the only strategy utilized by regimes to demobilize the opposition. Other strategies, mainly cooptation and movement infiltration, are used by authoritarian regimes to fuel distrust among opposition movement actors and between movement actors and the citizens at large. These three strategies add to opposition movement’s fragmentation and demobilization.
The Constitution of Death Valence as a Key to Intervene in Social Discrimination
Authors: Stiller Mel
Published: October 2023

According to terror and meaning management theories, positive death valence might facilitate psychosocial intervention in social discrimination. The present theoretical article investigates the constitution of death valence with the objective to indicate key factors for a more radical, intersectional intervention in social discrimination. Basing on foundational works and recent research, I conclude that the automatic expectation of death need fulfillment constitutes death valence. Five death needs are detected: agency, belonging, dignity, hope, and meaning. I then outline how the expectation of death need fulfillment may depend on death culture, with a special focus on the United States. Emotional death proximity is a necessary first step to perceive death needs and to contrast them with the cultural possibilities to fulfill them. Thus, psychosocial intervention in social discrimination may be improved by incorporating the key factors of positive death valence: emotional death proximity, death needs, and death culture.
Risk Factors for Underreporting of Life-Limiting Comorbidity Among Adults With Lower-Limb Loss
Authors: Stauffer Samantha Jeanne , Seth Mayank , Pohlig Ryan Todd , Beisheim-Ryan Emma Haldane , Horne John Robert , Smith Sarah Carolyn , Sarlo Frank Bernard , Sions Jaclyn Megan
Published: October 2023

Peripheral neuropathy (PN) and peripheral arterial disease (PAD) are life-limiting comorbidities among adults with lower-limb loss that may not be adequately addressed in current care models. The objective of this study was to evaluate underreporting of PN and PAD among adults with lower-limb loss. We conducted a secondary analysis of a cross-sectional dataset of community-dwelling adults with unilateral lower-limb loss seen in an outpatient Limb Loss Clinic (n = 196; mean age = 56.7 ± 14.4 years; 73.5% male). Individuals participated in standardized clinical examinations including Semmes-Weinstein monofilament testing to assess for PN and pedal pulse palpation to assess for PAD. Bivariate regression was performed to identify key variables for subsequent stepwise logistic regression to discern risk factors. Clinical examination results indicated 16.8% (n = 33) of participants had suspected PN alone, 15.8% (n = 31) had suspected PAD alone, and 23.0% (n = 45) had suspected PN and PAD. More than half of participants with clinical examination findings of PN or PAD failed to self-report the condition (57.7% and 86.8%, respectively). Among adults with lower-limb loss with suspected PN, participants with dysvascular amputations were at lower risk of underreporting (odds ratio [OR] = 0.2, 95% CI: 0.1-0.6). For those with suspected PAD, those who reported more medication prescriptions were at lower risk of underreporting (OR = 0.8, 95% CI: 0.7-1.0). Adults with lower-limb loss underreport PN and PAD per a medical history checklist, which may indicate underdiagnosis or lack of patient awareness. Routine assessment is highly recommended in this population and may be especially critical among individuals with non-dysvascular etiology.
Prominence and Salience Effects on Identity Nonverification
Authors: Burke Peter J. , Stets Jan E.
Published: October 2023

Identity verification occurs when individuals’ situational identity meanings match the meanings in their identity standard. When a person verifies an identity, they feel understood, and they feel good. When an identity is not verified, people feel misunderstood, and they feel bad. Two identity characteristics that may moderate people’s negative reactions to identity nonverification are identity prominence or importance and identity salience or time spent in the identity. We study these moderating effects on a national sample of adults who had problems verifying their identities during the COVID-19 pandemic. The identities included worker, friend, romantic partner, and family member. The results show, as hypothesized, that identity prominence increases the negative responses to nonverification, while identity salience decreases the negative responses to identity nonverification. We discuss how these countervailing effects advance our understanding of identity prominence and salience.
Being siblings of children with visual impairment
Authors: Battistin Tiziana , Bottan Irene , Zanardo Vincenzo , Mercuriali Elena , Reffo Maria Eleonora
Published: October 2023

This is a qualitative study that gives voice to 33 siblings of children with visual impairment in care at the Robert Hollman Foundation, focusing on their relationships with their brothers/sisters. Participants aged 7 to 22 recounted their daily life experiences and perspectives, expressing their feelings during semi-structured individual interviews. Data were analyzed according to the thematic analysis in the conceptual framework of ‘the new sociology of childhood’. The vast majority of siblings showed a special relationship with their brother/sister, characterized by unconditional love and willingness to help. Different emotions, such as happiness, empathy, sorrow and sadness, were expressed as well as how the experience of being siblings of children with visual impairment shapes their attitudes, highlighting a number of needs in some of the subjects.