bluuebunny/crossref_metadata_2025 huggingface dataset:
Comunicación entre la enfermera y el familiar: una relación entre seres humanos honesta, directa y real
Authors: Díaz Heredia Luz Patricia , Ballesteros Pinzón Gersson Andrés
Published: September 2021

Introducción: la estancia en la unidad de cuidados intensivos (UCI) genera en el paciente y sus familias sentimientos de falta de control, incertidumbre y ansiedad que se encuentran relacionados con falta de información y comunicación tanto sobre el proceso de salud-enfermedad vivido como sobre el tratamiento. Objetivo: describir las características de la comunicación en un etnos determinado entre la enfermera y el familiar del paciente hospitalizado. Método: estudio cualitativo con enfoque microetnográfico que utilizó para el análisis la propuesta de Bardin. Los participantes fueron 12 familiares de pacientes hospitalizados en la UCI adultos de las ciudades de Bucaramanga y Floridablanca (Colombia) durante el 2016. Se realizó entrevista semiestructurada con cinco preguntas sobre la comunicación con el profesional de enfermería. Resultados: en su mayoría, los participantes fueron mujeres, universitarias e hijas procedentes de ciudades diferentes del lugar de la entrevista. Surgió un tema principal: la comunicación: una relación entre seres humanos honesta, directa y real, conformado por cuatro categorías: la información como eje central de la comunicación en UCI; la comunicación que no se expresa con palabras, aún más importante en la relación; la comunicación no fluye si no hay tiempo, disposición y condiciones para entablar la relación; y la comunicación genera sentimientos positivos y satisfacción. Conclusión: la comunicación como proceso social enmarcado en la UCI como etnos particular demanda de la enfermera profesional cualidades como amabilidad, cordialidad, empatía, reconocimiento y lenguaje entendible, al igual que la realimentación y disposición para entablar y mantener este proceso vital para las relaciones humanas.
Educación continua en enfermería: Campus Virtual en Salud Publica en la Región de las Américas
Authors: Cassiani Silvia , De Almeida Rita , Hoyos Garcia Maria , Listovsky Gabriel , De Gracia Tejada Edgardo , Saldarriaga Sandoval Lilia , Menezes da Silva Fernando
Published: September 2021

Introducción: educación continua es una inversión personal y profesional necesaria a lo largo de la vida profesional de los enfermeros, porque amplía y perfecciona conocimientos técnicos, científicos y habilidades prácticas. Objetivo: describir la participación de enfermeros de la Región de las Américas en los cursos ofrecidos por el Campus Virtual de Salud Pública antes y al comienzo de la pandemia de la COVID-19, según género, edad, nivel educativo y lugar de trabajo. Método: estudio descriptivo cuantitativo. Se analizaron datos de los participantes de los cursos del periodo de enero del 2013 hasta junio del 2020 del Campus Virtual de Salud Pública. Población de estudio: enfermeros de la Región de las Américas que tomaron cursos virtuales. Se calcularon medidas de estadística descriptiva y proporciones de las variables sociodemográficas de los participantes de manera confidencial con autorización y credenciales para acceder datos en la plataforma. Resultados: a los 515 cursos virtuales ofrecidos por el Campus Virtual de Salud Pública se matricularon 368.018 enfermeros. Los porcentajes de enfermeros con certificado según el país de procedencia son los siguientes: Ecuador con 64,7%, México con 58,3%, Honduras con 52,9%, Paraguay con 48,6%, Colombia con 45,2%, Uruguay con 42,2%, Argentina con 38,0%, Chile con 22,7%, Perú con 21,3%, y Brasil con 9,7%. El 83,1% eran mujeres, el 75% tenía un nivel educativo universitario y el 40% tenía edades entre 26 y 35 años y el 47,1% trabajaba en hospitales. Conclusión: la pandemia de la COVID-19 refuerza la importancia de la educación continua virtual en la que los enfermeros pueden mejorar sus conocimientos, potencializar sus habilidades, y calificarse para los cambios en la práctica, la enseñanza y la investigación.
Mathematical model for acquiring immunity to malaria: a PDE approach
Authors: Tchoumi S Y , Kouakep Y T , Fotsa D J M , Kamba F G T , Kamgang J C , Houpa D D E
Published: September 2021

We develop a new model of integro-differential equations coupled with a partial differential equation that focuses on the study of the?  naturally acquiring immunity to malaria induced by exposure to infection. We analyze a continuous acquisition of immunity after infected individuals are treated. It exhibits complex and realistic mechanisms precised mathematically in both disease free or endemic context and in several numerical simulations showing the interplay between infection through the bite of mosquitoes. The model confirms the (partial) premunition of the human population in the regions where malaria is endemic. As common in literature, we indicate an equivalence of the basic reproduction rate as the spectral radius of a next generation operator.
Flow Pattern Analysis and Heat Transfer Characteristics During Subcooled Flow Boiling in a Rectangular Microchannel on ZnO Microrod Surface
Authors: Lin Yuhao , Li Junye , Sun Jia , Li Wei , Cao Yanlong
Published: September 2021

The combination of microstructured surface and microchannel flow boiling is expected to solve the thermal management problems of high-heat-flux devices. In this study, the experimental investigation of subcooled flow boiling in a high aspect ratio, one-sided heating rectangular microchannel was conducted with de-ionized water as the working fluid. ZnO microrods were synthesized on the titanium surface to be used as the heated surface compared with the bare titanium surface. A facile image tool is utilized to process the flow patterns photographed by a high-speed camera, which is analyzed with the heat transfer characteristics. The flow pattern of isolated bubbly flow reveals the large number of nucleation sites formed on the microrod surface but the heat transfer performance deteriorates with increasing mass flux because of the smaller bubble area and weaker nucleation. With increasing heat flux, the flow pattern changes from isolated bubbly flow to alternating bubbly/slug flow and alternating slug/annular flow. The latter flow pattern is confirmed to bring a higher heat transfer coefficient due to the larger area of thin-film evaporation. Compared with the bare surface, a higher heat transfer coefficient is achieved on the ZnO microrod surface for up to 37% due to the more nucleate sites and strengthened convective evaporation. Therefore, this surface might be suitable for heat dissipation in the watercraft or aerospace industry considering the low density, strong intensity, and corrosion resistance of titanium.
Hybrid structures by direct write lithography—Tuning the contrast and surface topography of grayscale photoresist with nanoimprint
Authors: Xie Sijia , Erjawetz Jan , Schuster Christine , Schift Helmut
Published: September 2021

Combining microstructures of different dimensions benefits from hybrid manufacturing strategies that use nanoimprint for generating regular large area structures and laser lithography for larger grayscale topography. While the individual processes are straightforward, due to the thermoplastic property of the positive resist used for grayscale lithography, diffraction on surface gratings and degradation of photoactive substances require a careful choice of the order of process steps, and balance of process, temperatures, and dimensions.
Common Peroneal Neuropathy Secondary to Repetitive Direct Blow Contusion Injuries in a Cheerleader: A Case Report
Authors: Harte Lauren M. , Czyrny James J. , Pavlesen Sonja , Ferrick Michael R.
Published: September 2021

A 13-year-old female cheerleader presented with common peroneal neuropathy secondary to repetitive direct blow contusion injuries to the lateral leg, sustained during her role as a flyer in cheerleading. Symptoms resolved when removed from cheerleading activities. Nerve conduction velocity and needle electromyography electrodiagnostic test studies performed at presentation and during treatment confirmed improvement of the neuropathy. The use of a protective knee brace that provided cushion near the fibular head prevented recurrence after returning to cheerleading. An association between common peroneal neuropathy and cheerleading has not been documented in previous literature. Awareness of this association will help with diagnosis and prevention of injuries.
The prevalence and specificity of local protein synthesis during neuronal synaptic plasticity
Authors: Sun Chao , Nold Andreas , Fusco Claudia M. , Rangaraju Vidhya , Tchumatchenko Tatjana , Heilemann Mike , Schuman Erin M.
Published: September 2021

In neurons, local protein synthesis is widespread, contributing to both the maintenance and plasticity of synapses.
Strengthening of Fibrous Composites with Nanoparticles
Authors: Irzhak V. I.
Published: September 2021

Ways and mechanisms of strengthening polymer fiber composites by modifying matrices with nanoparticles and grafting the latter onto fibers are considered: chemical vapor deposition, electrophoretic and chemical interaction.
Proptosis of the eye: a potential form of Madelung’s disease
Authors: Soomro Shayan , Ziahosseini Kimia , Sharma Poonam
Published: September 2021

Madelung’s disease is a rare disorder characterised by excessive and symmetrical deposits of adipose tissue, typically in the cervicofacial region. Alcohol is a known cause of the condition, however, there are reports that this condition is genetically inherited. Lipomatosis of the orbit has been described in the alcoholic Madelung’s disease, however, in our case report, we believe this is the first reported instance of proptosis caused by the genetic form of the condition. We present a 69-year-old woman, with a medical history of genetic Madelung’s disease, who presented with bilateral proptosis worse in her right eye. Her ocular examination was normal apart from exophthalmometry, showing bilateral proptosis. This was confirmed by an MRI, which further showed intraorbital fat deposition bilaterally. Due to the stability of her condition, no treatment was deemed necessary. We highlight the importance of monitoring for progressive optic nerve compromise and liposarcomatous malignant transformation.
Idiopathic spontaneous haemoperitoneum at 4 weeks gestation
Authors: O'Brien Emily , Feroz Rehan , Jasani Sona
Published: September 2021

A 20-year-old nulliparous patient with acute-onset abdominal pain and imaging suggestive of haemoperitoneum was admitted for observation. Though, initially, haemodynamically stable, her clinical picture worsened throughout her hospitalisation and warranted two separate laparoscopies that revealed 1200 mL and 50 mL of haemoperitoneum, respectively, without an identifiable bleeding source. After serial β-human chorionic gonadotropin levels and ultrasound confirmation of a viable pregnancy 23 days later, the patient underwent a normal antenatal course and delivered a healthy infant at 37 weeks gestation. This unusual case highlights the need to consider spontaneous haemoperitoneum in pregnancy as a diagnosis, particularly in the setting of pregnancy of unknown location, even at an early stage of pregnancy.
Delayed presentation of a baby with an oesophageal atresia on day 14 of life
Authors: De Vos Corne , Kohler Charlie , Fourie Natash , Goussard Pierre
Published: September 2021

Delayed presentation of oesophageal atresia (OA) with a tracheo-oesophageal fistula (TOF) is rare. Only a few case reports and two larger case series have been published. We present a neonate who was referred to our unit on day 14 of life with a missed OA and a TOF, having survived without any feeds or total parenteral nutrition up until referral.

We concluded that although such a delayed presentation is rare and avoidable, it does occur. This case highlights the necessity of good feedback to the referral hospitals with education on how to prevent this from recurring again. It also emphasises the necessity of a comprehensive clinical examination of all newborn babies. A high index of suspicion for OA with or without a TOF is essential in all babies with clinical drooling, feeding problems (from the first feed) and/or respiratory symptoms especially if combined with antenatal polyhydramnios.
Rare presentation of choroidal neovascularisation in a case of congenital hypertrophy of retinal pigment epithelium
Authors: Venkatesh Ramesh , Reddy Nikitha Gurram , Pulipaka Ram Snehith , Pereira Arpitha
Published: September 2021

A 22-year-old woman presented with a 2-week history of decreased vision, a central scotoma and metamorphopsia in her right eye. Her presenting visual acuity was 6/75 in the right eye and 6/6 in the left eye. Anterior segment examination was normal. Fundus examination of both eyes showed features of bilateral congenital hypertrophy of retinal pigment epithelium (CHRPE) lesions and choroidal neovascularisation (CNV) in the right eye. She was treated with intravitreal injection bevacizumab 1.25 mg/0.05 mL. One month later, there was regression of the CNV and subretinal fluid and her vision improved to 6/12. At the final follow-up visit, her vision was maintained at 6/9 with regression of CNV noted. To conclude, CNV is a rare association of CHRPE. It can lead to vision-threatening problem if it involves the macula and should be identified promptly and managed appropriately.
Haemophagocytic lymphohistiocytosis in pregnancy: a pertinent case during the COVID-19 pandemic
Authors: Potts Jacqueline , Gaudet Brittney , Durie Danielle , Quinones Joanne
Published: September 2021

Haemophagocytic lymphohistiocytosis (HLH) is a rare, often fatal disease, and presents a diagnostic challenge in the pregnant patient. This challenge is particularly relevant during the current COVID-19 pandemic. We present a case of HLH in a pregnant woman presenting with fever predating the COVID-19 pandemic. A 33-year-old, gravida 2, para 1 at 27 weeks’ gestation presented with fever, transaminitis, thrombocytopenia and elevated ferritin. After treatment according to the HLH-94 protocol, caesarean delivery and weeks of intensive care, the patient recovered fully. With prompt diagnosis and a multispecialty team at our tertiary care facility, she and her baby overcame a dire prognosis. HLH should be considered in pregnant patients presenting with a febrile illness. Particularly in cases of severe COVID-19, secondary HLH must be considered as an associated diagnosis.
Primary lung abscess due to multidrug-resistantKlebsiella pneumoniae
Authors: Chrystle Mascarenhas , Vishak Acharya , Sindhu Kamath , Jane Mendonca
Published: September 2021

Primary lung abscess as a complication of necrotising community-acquired pneumonia due to multidrug-resistant (MDR)Klebsiella pneumoniaeis rare. A 63-year-old man with a medical history of type 2 diabetes mellitus and chronic kidney disease was diagnosed with lung abscess due to MDRKlebsiella pneumoniae, a rare organism as a causative agent for community-acquired pneumonia. This unusual case revealed therapeutic challenges faced owing to factors such as drug-resistant pathogen, longer duration of antibiotics required for lung abscess and the chronic kidney status of the patient limiting the dosage of antibiotics. The clinical nuggets discussed in this case might pave the way in the future for management guidelines to be formulated in optimising the selection and duration of therapy for lung abscesses with MDR aetiology and in early recognition of this rare but dreaded entity.
Laparoscopic spleen-preserving dome resection for a giant primary epithelial splenic cyst
Authors: Lowrie Neil Robert , Londahl Monica Jane , Richter Konrad Klaus
Published: September 2021

Non-parasitic splenic cysts are rare and are seldom diagnosed outside the paediatric surgical practice. Giant true primary epithelial cysts greater than 14 cm in diameter are even rarer. Laparoscopic surgery is preferable; however, bleeding, splenectomy and recurrence are recognised risks. Here, we report a young female patient with a 21 cm symptomatic primary splenic cyst. The patient underwent a spleen-preserving laparoscopy and was followed up for 2 years when she had an MRI of the abdomen. Surgical, technical and perioperative treatment aspects are discussed here, in the context of the current literature.
How heavy can dark matter be? Constraining colourful unitarity with SARAH
Authors: Goodsell Mark D. , Moutafis Rhea
Published: September 2021

We describe the automation of the calculation of perturbative unitarity constraints including scalars that have colour charges, and its release in . We apply this, along with vacuum stability constraints, to a simple dark matter model with colourful mediators and interesting decays, and show how it leads to a bound on a thermal relic dark matter mass well below the classic Griest-Kamionkowski limit.
Newly observed X(4630): a new charmoniumlike molecule
Authors: Yang Xin-Dian , Wang Fu-Lai , Liu Zhan-Wei , Liu Xiang
Published: September 2021

Very recently, the LHCb Collaboration at the Large Hadron Collider at CERN observed new resonance X(4630). The X(4630) is decoded as a charmoniumlike molecule with hidden-strange quantum number well in the one-boson-exchange mechanism. Especially, the study of its hidden-charmed decays explicitly shows the dominant role of $$J/\psi \phi $$

J
/
ψ
ϕ

among all allowed hidden-charmed decays of the X(4630), which enforces the conclusion of X(4630) as a charmoniumlike molecule. The discovery of the X(4630) is a crucial step of constructing charmoniumlike molecule zoo.
On the difference between FOPT and CIPT for hadronic tau decays
Authors: Hoang André H. , Regner Christoph
Published: September 2021

In this article we review the results of our recent work on the difference between the Borel representations of $$\tau $$
τ
hadronic spectral function moments obtained with the CIPT and FOPT methods. For the presentation of the theoretical results we focus on the large-$$\beta _0$$

β
0

approximation, where all expressions can be written down in closed form, and we comment on the generalization to full QCD. The results may explain the discrepancy in the behavior of the FOPT and CIPT series that has been the topic of intense discussions in previous literature and which represents a major part of the theoretical uncertainties in current strong coupling determinations from hadronic $$\tau $$
τ
decays. The findings also imply that the OPE corrections for FOPT and CIPT differ and that the OPE corrections for CIPT do not have standard form.
Statistical properties of the aftershocks of stock market crashes revisited: Analysis based on the 1987 crash, financial-crisis-2008 and COVID-19 pandemic
Authors: Rai Anish , Mahata Ajit , Nurujjaman Md , Prakash Om
Published: September 2021

During any unique crisis, panic sell-off leads to a massive stock market crash that may continue for more than a day, termed as mainshock. The effect of a mainshock in the form of aftershocks can be felt throughout the recovery phase of stock price. As the market remains in stress during recovery, any small perturbation leads to a relatively smaller aftershock. The duration of the recovery phase has been estimated using structural break analysis. We have carried out statistical analyses of 1987 stock market crash, 2008 financial crisis and 2020 COVID-19 pandemic considering the actual crash times of the mainshock and aftershocks. Earlier, such analyses were done considering absolute one-day return, which cannot capture a crash properly. The results show that the mainshock and aftershock in the stock market follow the Gutenberg–Richter (GR) power law. Further, we obtained higher [Formula: see text] value for the COVID-19 crash compared to the financial-crisis-2008 from the GR law. This implies that the recovery of stock price during COVID-19 may be faster than the financial-crisis-2008. The result is consistent with the present recovery of the market from the COVID-19 pandemic. The analysis shows that the high-magnitude aftershocks are rare, and low-magnitude aftershocks are frequent during the recovery phase. The analysis also shows that the inter-occurrence times of the aftershocks follow the generalized Pareto distribution, i.e. [Formula: see text], where [Formula: see text] and [Formula: see text] are constants and [Formula: see text] is the inter-occurrence time. This analysis may help investors to restructure their portfolio during a market crash.
Modeling of cooperative adaptive cruise control vehicle and its effect on traffic flow
Authors: Chen Jianzhong , Zhou Yang , Li Jing , Liang Huan , Lv Zekai , Hu Yanmei
Published: September 2021

In this paper, an improved multianticipative cooperative adaptive cruise control (CACC) model is proposed based on fully utilizing multivehicle information obtained by vehicle-to-vehicle communication. More flexible, effective and practical spacing strategy is embedded into the model. We design a new lane-changing rule for CACC vehicles on the freeway. The rule considers that CACC vehicles are more inclined to form a platoon for coordinated control. Furthermore, we investigate the effect of CACC vehicles on two-lane traffic flow. The results demonstrate that introducing CACC vehicles into mixed traffic and forming CACC platoon to cooperative control can improve traffic efficiency and enhance road capacity to a certain extent.
Solitary wave solutions of chiral nonlinear Schrödinger equations
Authors: Esen Handenur , Ozdemir Neslihan , Secer Aydin , Bayram Mustafa , Sulaiman Tukur Abdulkadir , Yusuf Abdullahi
Published: September 2021

This paper presents the (1+1)-dimensional chiral nonlinear Schrödinger equation (1DCNLSE) and (2+1)-dimensional chiral nonlinear Schrödinger equation (2DCNLSE) that define the edge states of the fractional quantum hall effect. In this paper, we implement the Riccati–Bernoulli sub-ODE method in reporting the solutions of these two nonlinear physical models. As a result of this, some singular periodic waves, dark and singular optical soliton solutions are generated for these models. Some of the acquired solutions are illustrated by three-dimensional (3D) and two-dimensional (2D) graphs utilizing suitable values of the parameters with the help of the MAPLE software to demonstrate the importance in the real-world of the presented equations.
Surface wave behavior and refraction simulation on the ocean for the fractional Ostrovsky–Benjamin–Bona–Mahony equation
Authors: Duran Serbay , Yokuş Asif , Durur Hülya
Published: September 2021

In this study, we have taken into account the time-fractional Ostrovsky–Benjamin–Bona–Mahony equation, which is a synthesis of the time-fractional Ostrovsky equation and time-fractional Benjamin–Bona–Mahony equations and contains both mathematical and physical properties. Traveling wave solutions are produced by using the Ostrovsky–Benjamin–Bona–Mahony equation that physically sheds light on the incoming wave event on the ocean surface, using the sub-equation and Bernoulli sub-equation function methods. These solutions are presented in hyperbolic, trigonometric, singular and dark (topological) soliton types. With the help of special values given to the coefficients in the solitons obtained, it is associated with the solutions in the literature and it is observed that the solitons produced in this study are more general. Graphs representing the stationary wave at any given moment are presented. The advantages and disadvantages as well as the similarities and differences of the method are discussed in detail. Also, the behavior of the wave and its refraction according to the velocity variable, which is a physically important factor of the traveling wave solution, is analyzed and supported by simulation.
Low Latency Aware Fog Nodes Placement in Internet of Things Service Infrastructure
Authors: Maiti Prasenjit , Sahoo Bibhudatta , Turuk Ashok Kumar
Published: September 2021

Fog Computing extends storage and computation resources closer to end-devices. In several cases, the Internet of Things (IoT) applications that are time-sensitive require low response time. Thus, reducing the latency in IoT networks is one of the essential tasks. To this end, fog computing is developed with a motive for the data production and consumption to always be within proximity; therefore, the fog nodes must be placed at the edge of the network, which is near the end devices, such that the latency is minimized. The optimal location selection for fog node placement within a network out of a very large number of possibilities, such as minimize latency, is a challenging problem. So, it is a combinatorial optimization problem. Hard combinatorial optimization problems (NP-hard) involve huge discrete search spaces. The fog node placement problem is an NP-hard problem. NP-hard problems are often addressed by using heuristic methods and approximation algorithms. Combinatorial optimization problems can be viewed as searching for the best element of some set of discrete items; therefore in principle, any metaheuristic can be used to solve them. To resolve this, meta-heuristic-based methods is proposed. We apply the Simulated Annealing (SA), Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) technique to design fog node placement algorithms. Genetic Algorithm is observed to give better solutions. Since Genetic Algorithm may get stuck in local optima, Hybrid Genetic Algorithm, and Simulated Annealing (GA-SA), Hybrid Genetic Algorithm and Particle Swarm Optimization (GA-PSO) were compared with GA. By extensive simulations, it is observed that hybrid GA-SA-based for node placement algorithm outperforms other baseline algorithms in terms of response time for the IoT applications.
An Universal Adversarial Attack Method Based on Spherical Projection
Authors: Fan Chunlong , Zhang Zhimin , Qiao Jianzhong
Published: September 2021

Adversarial attack on neural networks has become an important problem restricting its security applications, and among adversarial attacks oriented towards the sample set, the universal perturbation design causing most sample output errors is critical to the study. This paper takes the neural network for image classification as the research object, summarizes the existing universal perturbation generation algorithm, proposes a universal perturbation generation algorithm combining batch stochastic gradient rise and spherical projection search, achieves loss function reduction through the iterative training of stochastic gradient rise in batch samples, and limits the universal perturbation search to a high-dimensional sphere with radius [Formula: see text] to reduce the search space of universal perturbation. Moreover, the regularized technology is introduced to improve the generation quality of universal perturbations. The experimental results show that compared with the baseline algorithm, the attack success rate increases by more than 10%, the solution efficiency of universal perturbation is improved by one order of magnitude, and the quality controllability of universal perturbation is better.
A Novel Effort Measure Method for Effort-Aware Just-in-Time Software Defect Prediction
Authors: Chen Liqiong , Song Shilong , Wang Can
Published: September 2021

Just-in-time software defect prediction (JIT-SDP) is a fine-grained software defect prediction technology, which aims to identify the defective code changes in software systems. Effort-aware software defect prediction is a software defect prediction technology that takes into consideration the cost of code inspection, which can find more defective code changes in limited test resources. The traditional effort-aware defect prediction model mainly measures the effort based on the number of lines of code (LOC) and rarely considers additional factors. This paper proposes a novel effort measure method called Multi-Metric Joint Calculation (MMJC). When measuring the effort, MMJC takes into account not only LOC, but also the distribution of modified code across different files (Entropy), the number of developers that changed the files (NDEV) and the developer experience (EXP). In the simulation experiment, MMJC is combined with Linear Regression, Decision Tree, Random Forest, LightGBM, Support Vector Machine and Neural Network, respectively, to build the software defect prediction model. Several comparative experiments are conducted between the models based on MMJC and baseline models. The results show that indicators ACC and [Formula: see text] of the models based on MMJC are improved by 35.3% and 15.9% on average in the three verification scenarios, respectively, compared with the baseline models.
Projective dynamics and an integrable Boltzmann billiard model
Authors: Zhao Lei
Published: September 2021

The aim of this note is to explain the integrability of an integrable Boltzmann billiard model, previously established by Gallavotti and Jauslin [G. Gallavotti and I. Jauslin, A theorem on Ellipses, an integrable system and a theorem of Boltzmann, preprint (2020); arXiv:2008.01955], alternatively via the viewpoint of projective dynamics. We show that the energy of a corresponding spherical problem leads to an additional first integral of the system equivalent to Gallavotti–Jauslin’s first integral. The approach also leads to a family of integrable billiard models in the plane and on the sphere defined through the planar and spherical Kepler–Coulomb problems.
Weak pullback mean random attractors for stochastic evolution equations and applications
Authors: Gu Anhui
Published: September 2021

In this paper, we investigate the existence and uniqueness of weak pullback mean random attractors for abstract stochastic evolution equations with general diffusion terms in Bochner spaces. As applications, the existence and uniqueness of weak pullback mean random attractors for some stochastic models such as stochastic reaction–diffusion equations, the stochastic p-Laplace equation and stochastic porous media equations are established.
WITHIN-DAY AND BETWEEN-DAY RELIABILITY OF A FBG-BASED SMART SOCK SYSTEM FOR MEASURING ACTIVE TOE FLEXION DISPLACEMENT OF THE HALLUX
Authors: KONG PUI WAH , PAN JING WEN , FONG DANIEL T. P. , LEOW YIXUAN , LIU YIMIN , CHAN CHI CHIU , HENG MARABELLE LI-WEN
Published: September 2021

This study examined the test-retest reliability of hallux flexion displacement measured using a smart sock system with embedded fiber Bragg grating (FBG) sensors. Thirty female participants consisting of 15 hallux valgus (HV) patients and 15 control participants were recruited. Maximum active hallux flexion displacement was measured twice on each participant in the first visit; the same procedures were repeated 7 days later. Intraclass correlation coefficients (ICC2,1) and standard error of measurement (SEM) were applied to test within-day and between-day reliability. Paired-samples T-test was performed to compare the displacements between trials. Results showed almost perfect within-day reliability for both HV and control groups ([Formula: see text] and 0.977, respectively) with small SEM (both 0.5[Formula: see text]cm). However, fair to moderate between-day reliability was found (0.323 and 0.438, respectively). Significant differences were found between repeated measurements taken on the same day (mean [Formula: see text][Formula: see text]cm, [Formula: see text]) and on different days (mean [Formula: see text][Formula: see text]cm, [Formula: see text]), though the effect size was small. The poorer between-day reliability is likely due to the inconsistency in fitting the sock onto the foot. Future optimization of the prototype design is called for to improve the fitting consistency of wearable sensors onto patients.
Strategic Supplier Selection in Payment Industry: A Multi-Criteria Solution for Insufficient and Interrelated Data Sources
Authors: Hekmat Siavash , Amiri Maghsoud , Madraki Golshan
Published: September 2021

Our goal is to address the complicated problem of strategic supplier selection with interrelated and insufficient data. To achieve this goal, we proposed our Strategic Supplier Selection Methodology (SSSM). First, SSSM formulates the enterprise strategies and evaluation criteria. Then, we developed a novel method called Grey Principal Component Analysis-Data Envelopment Analysis (GPCA-DEA) to evaluate suppliers in SSSM. GPCA-DEA overcomes the major disadvantages and limitations of former methodologies (e.g., DEA) while dealing with insufficient and interrelated data. Finally, SSSM applies Multiple Attribute Decision-Making (MADM) methods to select suppliers based on the ranking score. The application of SSSM is illustrated in the payment industry to select Payment Initiation Service Providers (PISP). For the first time, we considered the payment industry-specific criteria in compliance with the latest regulation (PSD2). The Spearman rank correlation statistical test showed that our method (GPCA-DEA used in SSSM) yields more reliable results than a former version of DEA.
Weak nonhomogeneous wavelet dual frames for Walsh reducing subspace of L2(ℝ+)
Authors: Zhang Yan , Li Yun-Zhang
Published: September 2021

In wavelet analysis, refinable functions are the bases of extension principles for constructing (weak) dual wavelet frames for [Formula: see text] and its reducing subspaces. This paper addresses refinable function-based dual wavelet frames construction in Walsh reducing subspaces of [Formula: see text]. We obtain a Walsh–Fourier transform domain characterization for weak [Formula: see text]-adic nonhomogeneous dual wavelet frames; and present a mixed oblique extension principle for constructing weak [Formula: see text]-adic nonhomogeneous dual wavelet frames in Walsh reducing subspaces of [Formula: see text].
Research on Dynamic Characteristics of Composite Towering Structure
Authors: Gu Jin Peng , Qin Yi Xiao , Xia Yong Yong , Jiao Qian Qian , Gao Hai Biao , Zhang Yang Yang , Zhang Hao
Published: September 2021

The vibration of the composite towering structure as tower crane is obvious under dynamic load, so that it is very necessary to study the dynamic characteristics of the composite towering structure. The tower crane and the hoisting rope are considered flexible, and the lifted object is treated as a rigid body. Considering the pendulum motion of the payload, the rigid flexible coupling model of crane system is established by Lagrangian equation. The dynamic characteristics of the composite towering structure under the action of pendulum are studied numerically. In order to study the dynamic characteristics of the composite towering structure under different working conditions, simulations are carried out under various conditions with different lifting ranges, various hoisting ratios and swing directions of payload. According to the computation results, the influence of different parameters on the dynamic response of the composite towering structure is revealed.
Optoelectronic and Structural Properties of Plasma Deposited Nanocrystalline Hydrogenated Silicon Oxide Thin Films
Authors: Jana Tapati , Goswami Romyani
Published: September 2021

To develop wide bandgap materials for solar cells and other optoelectronic devices, undoped hydrogenated silicon oxide (SiOx:H) thin films are prepared by conventional radio frequency plasma enhanced chemical vapor deposition (RF PECVD) method. The variation of carbon dioxide dilution ([Formula: see text]) on optoelectronic and structural properties are studied thoroughly by keeping silane and hydrogen gas flow fixed. Surface morphology of the SiOx:H films have been studied by Field Emission Scanning Electron Microscopy (FESEM) and Atomic Force Microscopy (AFM). Distinct silicon nanocrystallites of average diameter [Formula: see text] 3–6[Formula: see text]nm embedded uniformly in amorphous SiOx network have been observed in high resolution Transmission Electron Microscopy (HRTEM). From Fourier Transform Infrared spectra (FTIR), it is observed that oxygen content ([Formula: see text]) increases initially with [Formula: see text] and afterwards it decreases. Strong room temperature photoluminescence (PL) peak is obtained for the as-deposited films having lower oxygen content ([Formula: see text]). The origin of room temperature PL spectra and its correlation with [Formula: see text] can be explained by quantum confinement effect (QCE) theory.
Ultrathin Sulfonated Mesoporous Silica Film with Well-Ordered Perpendicular Mesochannels: In-Situ Preparation, Characterization and Permselectivity
Authors: Feng Anxin , Liu Ying , Tang Shuai , Lin Lujian , Sun Xia
Published: September 2021

In this paper, a new type of ultrathin sulfonated mesoporous silica film (SMSF) with well-ordered perpendicular mesochannels was in-situ synthesized by Stöber approach and co-condensation method. The mesostructure of the synthesized SMSF was characterized. The results of small-angle XRD, high-resolution TEM, and cyclic voltammetry (CV) exhibited that, after loading of MPTMS, SMSF had an ordered mesostructure with a perpendicular orientation and open ends. SEM showed that SMSF could be entirely transferred and easily handled. FT-IR presented that sulfonic groups were successfully added to the surface of the nanochannels of silica film. Compared with mesoporous silica film (MSF) and commercial cation exchange membrane (CEM), SMSF had the highest permselectivity. The permselectivity of SMSF was not lined with the loading of the sulfonic groups (–SO3H). The highest permselectivity of SMSF to Na[Formula: see text] was 94% when the loading of MPTMS was 5.98% (wt.%). SMSF is a promising material in the application of salinity gradient energy harvest.
Simulation and optimization of a combined cycle power plant with low heating value fuel gas
Authors: Han Renzhi , Wang Xin
Published: September 2021

Combined cycle power plant (CCPP) usually plays an important role in balancing byproduct gas generation and consumption in integrated iron and steel plant. The low heat value fuel gases, such as blast furnace gas (BFG) or mixed gas with Coke oven gas (COG) and BFG, are preferred to be used in high-efficient CCPP for power generation. In practice, the general heat value of mixed gas can be set in the range of 3500–4400[Formula: see text]kJ/Nm3. This paper presents a methodology to simulate operating parameters of CCPP with BFG. A generic model of gas turbine with open loop stage cooling employing air is used to simulate the performance of gas turbines cycle under different compressor pressure ratios and turbine inlet temperatures (TIT). The isentropic efficiencies for gas compressor and gas turbine are supposed to be constants and set corresponding to published industrial experience. The steam cycle is composed of classical double-pressure heat recovery steam generator (HRSG) and steam turbines according to gas turbine outlet temperature. Specific work, gas turbine cycle efficiency, cogeneration thermal efficiency and coolant air flow requirements are evaluated to find the optimal compressor pressure ratio and TIT. The research results are useful to select the optimum operating parameters of CCPP with BFG. Performance features were estimated with the help of compression ratios 12.5–20 and combustor exit temperature 1150–1350[Formula: see text]C.
Effect of lithium carbonate modification on the ferroelectric phase transition diffusion in lead ferroniobate ceramics
Authors: Pavelko A. A. , Pavlenko A. V. , Reznichenko L. A.
Published: September 2021

The paper discusses the features of the effect of modification with lithium carbonate on the dielectric dispersion of lead ferroniobate ceramics. The modifier has been previously shown to change the ways of the recrystallization sintering and therefore reduce the sintering temperature of the ceramics, increase their average grain size, and improve their dielectric and piezoelectric properties. In this study, the emphasis is placed on the analysis of the diffusion effects of the ferroelectric phase transition upon such modification considered from the standpoint of the chemical specifics of the modifier and its location in the structure of the parent compound.
Topic Modeling Using Latent Dirichlet allocation
Authors: Chauhan Uttam , Shah Apurva
Published: September 2021

We are not able to deal with a mammoth text corpus without summarizing them into a relatively small subset. A computational tool is extremely needed to understand such a gigantic pool of text. Probabilistic Topic Modeling discovers and explains the enormous collection of documents by reducing them in a topical subspace. In this work, we study the background and advancement of topic modeling techniques. We first introduce the preliminaries of the topic modeling techniques and review its extensions and variations, such as topic modeling over various domains, hierarchical topic modeling, word embedded topic models, and topic models in multilingual perspectives. Besides, the research work for topic modeling in a distributed environment, topic visualization approaches also have been explored. We also covered the implementation and evaluation techniques for topic models in brief. Comparison matrices have been shown over the experimental results of the various categories of topic modeling. Diverse technical challenges and future directions have been discussed.
Cold Shock Response in Bacteria
Authors: Zhang Yan , Gross Carol A.
Published: September 2021

Bacteria often encounter temperature fluctuations in their natural habitats and must adapt to survive. The molecular response of bacteria to sudden temperature upshift or downshift is termed the heat shock response (HSR) or the cold shock response (CSR), respectively. Unlike the HSR, which activates a dedicated transcription factor that predominantly copes with heat-induced protein folding stress, the CSR is mediated by a diverse set of inputs. This review provides a picture of our current understanding of the CSR across bacteria. The fundamental aspects of CSR involved in sensing and adapting to temperature drop, including regulation of membrane fluidity, protein folding, DNA topology, RNA metabolism, and protein translation, are discussed. Special emphasis is placed on recent findings of a CSR circuitry in Escherichia coli mediated by cold shock family proteins and RNase R that monitors and modulates messenger RNA structure to facilitate global translation recovery during acclimation.
Perspective on Data Science
Authors: Peng Roger D. , Parker Hilary S.
Published: September 2021

The field of data science currently enjoys a broad definition that includes a wide array of activities which borrow from many other established fields of study. Having such a vague characterization of a field in the early stages might be natural, but over time maintaining such a broad definition becomes unwieldy and impedes progress. In particular, the teaching of data science is hampered by the seeming need to cover many different points of interest. Data scientists must ultimately identify the core of the field by determining what makes the field unique and what it means to develop new knowledge in data science. In this review we attempt to distill some core ideas from data science by focusing on the iterative process of data analysis and develop some generalizations from past experience. Generalizations of this nature could form the basis of a theory of data science and would serve to unify and scale the teaching of data science to large audiences.
Oxidative and Cellular Stress Markers in Postmenopause Women with Diabetes: The Impact of Years of Menopause
Authors: Anklam Carolain Felipin Vincensi , Lissarassa Yana Picinin Sandri , dos Santos Analú Bender , Costa-Beber Lílian Corrêa , Sulzbacher Lucas Machado , Goettems-Fiorin Pauline Brendler , Heck Thiago Gomes , Frizzo Matias Nunes , Ludwig Mirna Stela
Published: September 2021

Women live approximately one-third of their lives in postmenopause. Among postmenopausal women, type 2 diabetes mellitus (DM2) is one of the most prevalent chronic diseases. These conditions promote alterations in the oxidative, metabolic, and immune-inflammatory profiles marked by higher extracellular 72 kDa-heat shock protein (eHSP72). Here, we investigated whether the time of menopause is associated with oxidative cellular stress marker levels in postmenopausal women with DM2. Sixty-four women were recruited (

56.7
±
12.6

years old) in the pre- (

n
=
22

) and postmenopause (

n
=
42

) period, with (

n
=
19

) or without DM2 (

n
=
45

), and a fasting blood collection was made for the evaluation of metabolic, oxidative, and inflammatory markers. We found that menopause and DM2 influenced metabolic and oxidative parameters and presented synergistic effects on the plasma lipoperoxidation levels. Also, postmenopausal women had the highest eHSP72 concentration levels associated with the years in postmenopause. We conclude that the time of menopause impacts the markers of cellular stress and increases the risk of oxidative stress, mainly when it is associated with DM2.
Carbon Dot Functionalized Papers for the Selective Detection of 2,4,6‐Trinitrophenol in Aqueous Solutions
Authors: Peng Wenli , Gan Li , Li Weihan , Deng Shixiong
Published: September 2021

The development of probes for the testing of the carcinogenic pollutant 2,4,6‐trinitrophenol (TNP) is of great importance for environmental protection and human health. In this paper, a new rapid and sensitive fluorescence detection method based on carbon dots (CDs) was designed for the detection of TNP. The CDs were synthesized by simple pyrolysis using citric acid as raw material and characterized by various advanced techniques. The addition of TNP caused a significant turn off in the fluorescence of the CDs. The fluorescence quench intensity and TNP concentration exhibited a good linear correlation in the range of 0–80 μM with a minimum detection limit of 0.48 μM and a related coefficient of 0.994. The analytical method was applied to the determination of trace TNP in river water and tap water with recoveries in the range of 98%–110% and relative standard deviations less than 5%. Importantly, carbon dots functionalized papers (CDFPs) were prepared using the synthesized CDs and successfully applied to the determination of TNP in aqueous solutions, demonstrating the promising application of the method.
Progressive Nodular Histiocytosis: Report of a Case and Review of the Literature
Authors: Numbere Numbereye , Pukhalskaya Tatsiana , Bowman Blythe , Campbell Katelynn , Smoller Bruce
Published: September 2021

Progressive nodular histiocytosis (PNH) is a rare condition characterized by progressive eruption of multiple yellowish-brown papules and nodules on the skin and mucous membranes. We present the case of a 37-year-old Caucasian man with gradually increased appearance of nodular lesions on the forehead and right temple. These lesions were initially diagnosed as xanthomas and did not respond to intralesional injections of triamcinolone. Additional biopsy revealed an intense dermal infiltrate of foamy mononuclear epithelioid cells with a minor admixture of plasma cells, lymphocytes, and scattered multinucleated giant cells. On immunohistochemical staining, the lesional cells were positive for CD163 and CD68 and negative for CD1a, thus confirming a mononuclear-macrophage lineage. The clinical presentation and the histological impression lead to the diagnosis of PNH. This condition could be challenging, mimicking microscopically similar lesions of the non-Langerhans cell histiocytosis group. Although uncommon, PNH stands out due to its clinical and microscopic features and should be taken into consideration in the differential diagnosis of cutaneous histiocytoses.