bluuebunny/crossref_metadata_2025 huggingface dataset:
Formation of Financial Literacy of Students − Future Teachers of Mathematics Through the Solution of Cases
Authors:   Transbaikal State University, Yulia S. Tokareva , Natalya V. Kononenko ,   Transbaikal State University, Nikolay Yu. Zarechnov ,   Chita Division of the Siberian Main Branch of the Central Bank of the Russian Federation, Galina D. Tonkikh ,   Transbaikal State University
Published: October 2022

Currently, financial literacy is recognized as a key competence. It not only allows each individual person to manage personal finances and be more protected from fraudulent actions, but also is a way to improve the financial well-being and stability of the entire state. The problems of forming financial literacy are acute at different levels of the education system. For university students − future teachers of mathematics − the issue of forming financial literacy and raising its level is not only personal in nature. It becomes the key to his future professional activity, since it is the teachers who lay the foundation for their students to form a financial culture. The purpose of this study is to identify the possibilities of using cases to form the financial literacy of future mathematics teachers in the process of studying mathematical disciplines. The methodological base is a practice-oriented approach. The paper presents one of the cases developed in the study, which can be used in higher education in the study of the discipline “Algebra”. This case uses the mathematical apparatus of the topic “Matrices and determinants” and is considered as the main tool for the formation of financial literacy of future mathematics teachers. Based on the context of the proposed case, financial literacy components were identified, acting as descriptors of basic and key competencies. The execution of the case implies the implementation of a certain plan, which can be considered as an algorithm implemented in accordance with didactic principles. The results of the work can be used in the educational process of higher educational institutions that implement programs in the pedagogical direction.
Effect of acoustic black hole parameters on vibration suppression of rectangular plate
Authors: Du Xiaofei , Gu Qing
Published: October 2022

The acoustic black hole has the ability to gather and manipulate the flexural wave in the structure, and can be used to achieve vibration suppression of the structure. A group of FEM models for the vibration analysis of the rectangular plate embedded with acoustic black holes were established in this paper. Four monitoring points on the ABH plate were selected to calculate their vibration velocity response in 100 Hz-3 kHz frequency interval. In order to study the effects of acoustic black hole geometric parameters and damping layer geometric parameters on the vibration response of the ABH plate, 15 combinations of different parameters of the maximum ABH diameter, the truncated thickness of the ABH, the power index of the ABH, and the damping layer thickness, the maximum diameter of the damping layer were selected to calculate the vibration velocity response of the four monitoring points. The calculation result can help us understand the effects of acoustic black hole geometric parameters and damping layer geometric parameters on the vibration suppression of rectangular plate.
Health diagnosis of marine engine room equipment based on BP and D-S evidence theory
Authors: Jiang Yuhang , Wang Zhimin , Zhang Yi , Chen Ning
Published: October 2022

Aiming at the problems of poor resolution and low precision in traditional health diagnosis of Marine engine room equipment, this paper proposes a health diagnosis method of intelligent Marine engine room equipment based on BP neural network and D-S evidence theory. Firstly, the time-domain parameters of the obtained acceleration signal are extracted and the energy in frequency domain after wavelet decomposition is calculated. Then the eigenvectors of time domain and wavelet packet energy were constructed respectively, and the normalized processing was input into two BP neural networks to obtain the classification results. Finally, the fault classification results in time domain and frequency domain are combined with the D-S evidence theory and output diagnosis. Through experimental analysis and verification of rolling bearing data from electrical Engineering Laboratory of Case Western Reserve University, the accuracy of the proposed method is better than that of time domain and frequency domain analysis alone, which improves the accuracy and reliability of fault classification.
Analysis of the effect of squeeze film damper on the bending-torsional coupling vibration characteristics of dual-rotor system
Authors: Jin Zhu , Chen Moli , Luo Gui-Huo , Yue Lin
Published: October 2022

The study of the vibration reduction characteristics of SFD to the bending-torsional coupled vibration of the dual-rotor system can provide support for the structural design of aero-engines. Based on the overall eccentric disc model, the bending-torsional coupling dynamic equation of the dual-rotor system is established in this paper. The amplitude and nonlinear periodic characteristics of the dual-rotor system are obtained by combining Newmark-β method and Newton-Raphson method. The results show that the vibration reduction effect of SFD on bending-torsional coupling vibration is closely related to the speed. The vibration reduction effect of SFD is weak at the first-order critical speed range and below, and reduces the torsional amplitude by 70 % at the second-order critical speed range and above. SFD kept the bending-torsional coupling vibration of the dual-rotor system stable in a stable 5-period motion state.
Modal analysis of spur gears for varied teeth root cracks characteristics: finite element analysis (FEA) simulations
Authors: Syam Thaer , Badri Yousif , Sassi Sadok , Renno Jamil
Published: October 2022

Gear failure is considered the main alarming and undesirable event in gearboxes. Usually, cracks happen by fatigue caused due to cyclic loading. Fatigue stress is focused on the teeth root because of the small tooth fillet radius. This causes progressive damage to gear teeth which causes teeth failure, and hence, a damaged gear. This work shows a numerical framework to identify and quantify cracks' existence at the teeth root of spur gears. The problem is numerically analysed through finite element-based simulation with ANSYS by conducting a modal analysis. There are nine cases of gears with different cracks on their tooth; these cracks are varied by their number (single or multiple), Crack Length Percentage (CLP %), and location. The FEA is used to simulate all nine cases to predict the bending natural frequency of teeth and to investigate the effects of the variation of the crack by looking at the natural frequency of the teeth bending as well as the deformation level. Results revealed that the teeth bending natural frequency decreases as the CLP% increases. In addition, the gear stiffness is calculated based on the natural frequency and gear’s mass and it is indicated that the stiffness decreases as the CLP% increases, while the deformation level increase with CLP%.
Evaluation of segment convergence and settlement of subway shield tunnel in water-rich complex stratum
Authors: Feng Lei , Li Jinping , He Binbin
Published: October 2022

Based on the shield tunnel construction of the left line of Guowei road station-Qingshan lake west station of Nanchang metro line 3, the study focuses on the adverse effects of tunnel segment convergence and settlement deformation of vault and arch bottom on shield construction in the process of shield tunnel construction in water-rich complex stratum. The time-space curves of segment convergence and settlement value on typical monitoring sections are drawn, their variation laws are analyzed, and the deformation values of monitoring data are analyzed and tested. Based on the analysis results, the qualitative and quantitative evaluation of the overall or local deformation state of each monitoring object of tunnel segment is carried out. The results show that the cumulative deformation of each typical monitoring section is lower than the warning value, and the tunnel segment has a systematic offset in the horizontal and vertical directions of the clearance.
Sloshing mitigation using vertical cylindrical baffle
Authors: Kumar Narveen , Choudhary Neelam
Published: October 2022

This study has looked into the phenomenon of liquid vibrations in a rigid cylindrical container. The impacts of rigid vertical baffle positioned in the container on frequencies have been examined. The container is partially filled with an impermeable and non-viscous fluid. ANSYS software is used to report the mode shapes of the baffle and fluid domain.
Simulation and experimental investigation of kinematic characteristics of the wheeled in-pipe robot actuated by the unbalanced rotor
Authors: Korendiy Vitaliy , Kachur Oleksandr , Gurey Volodymyr , Predko Rostyslav , Palash Roman , Havrylchenko Oleksandr
Published: October 2022

Mobile robotic systems are currently of significant interest due to the wide range of possible applications. Among a great variety of mobile robots, specific attention is paid to the wheeled ones. The main purpose of this research consists in substantiating the possibilities of improving the vibration-driven robot equipped with the unidirectionally rotating wheels. The methodology of the present study contains the development of the robot’s 3D-model in the SolidWorks software, constructing the simplified dynamic diagram of the robot’s oscillatory system, and developing its simulation model in the MapleSim software. The research results are obtained by numerical solving of the motion equations in the MapleSim software, by simulating the robot locomotion conditions in the SolidWorks software, and by conducting experiments. The results present the main kinematic characteristics of the robot motion under different operational conditions. The major scientific novelty of this paper consists in developing the improved design of the wheeled robot driven by the centrifugal (inertial) vibration exciter and substantiating its operational peculiarities. The obtained results can be effectively used while creating the production prototypes of mobile robotic systems, particularly those for cleaning the pipelines and monitoring (inspecting) their inner surfaces, welds, joints, couplings, etc.
Review of Clare Pettitt, Serial Forms: The Unfinished Project of Modernity, 1815-1848 (2020)
Authors: Mussell James
Published: October 2022

Review of Clare Pettitt, Serial Forms: The Unfinished Project of Modernity, 1815-1848 (2020)
Understanding, Thinking and Exploring: Cultural Teaching of Vocabularies under the New English Curriculum Standard
Authors: Yu Yangyang
Published: October 2022

English vocabulary plays an important role in English language learning, and the methods of vocabulary acquisition also have a profound impact on its effect. Under the guidance of the New Curriculum Standard, the cultivation of cultural awareness is also an important part of the core literacy of English subjects, so it will be an inevitable trend of English vocabulary learning to apply the study of cultural awareness to vocabulary acquisition. In actual vocabulary teaching, to truly grasp the core essence of cultural awareness, teachers should recognize the shortcomings of cultural teaching and vocabulary teaching, and under the guidance of the core literacy of English subjects, combine vocabulary teaching with the transmission of cultural knowledge, aiming at exploring the English cultural connotation behind vocabulary, promoting the effective implementation of vocabulary and cultural teaching, and providing some reference suggestions for vocabulary cultural teaching
IOT Architecture, Challenges and Opportunities
Authors: Khandelwal Deversh , Bhatia Manjot Kaur
Published: October 2022

Abstract: The Internet of Things, as defined by the Internet itself, is the connection of embedded computing devices embedded differently within the existing infrastructure. According to IoT, soon our planet will contain the largest number of devices connected to the Internet. This paper is a discussion of the trending term 'Internet of Things' challenges and opportunities, as well as the formation of IoT, which describes widely used technologies such as M2M communications, cloud computing, IPv6, and RFID technologies, thus describing the use of IoT different fields. Finally, there is a brief review of all possible IoT applications
A Research on the Investment Patterns in Banking and Securities: A Study on Indian Investment Behavior
Authors: Anand Dr. Raghu G. , M Dr. Mala. K.
Published: October 2022

Abstract: The Investment Industry is highly growing amidst the pandemic issues. Today with developing infrastructure we have numerous options in the investing industry. Investments are broadly classified into 2 types, namely the active and passive. The active investment requires investor to change their assets in the portfolio as per the trends of market and requires knowledge, time , patience. The passive doesn’t need you to be active and is termed as buy and hold strategy of the industry. This is for ones who cannot indulge completely. Active includes high investment and the passive includes smaller investments. The risk in active increases with increase in buying and selling of assets and securities where as passive risk reduces with longer time of hold to the securities. Therefore the study solely focuses on both factors and to assess the changes in behaviour pattern of citizens of India in terms of investment. Their behaviour is observed on majority parameters and also how technology has changed the phase of industry. In the present study, the researcher has tried to understand the mindset of Indian citizens and their attitude towards investment and its changing patterns. The researcher tries to convince the readers to understand and be aware of all forms of Investment. The pandemic era has created a vacuum of lack of capital. The study has tried to incorporate maximum aspects to justify the study. The investment industry has totally become electronic controlling with improvement in technology for easy usages, reach and access.
Image Classification and Object Following Functions for Mobile Robots
Authors: Jain Lakshya , Bhanushali Upendra , Daryapurkar Rajashree
Published: October 2022

Abstract: This paper describes the design and implementation of a deployable, multi-modal system executed using Deep Learning with Computer Vision. The system was majorly created using Transfer Learning Algorithms, GoogleNet, and MATLAB, which were then made portable and deployable using a Raspberry Pi with Pi Cam. The neural networks were trained on a dataset consisting of several images and is highly accurate. This system consists of Fire Detection, Face and Intruder Detection, Object Identification, and Animal Identification, and follow me features which are meant to be deployed on a mobile robot such as an autonomous rover, drone, glider, and aquatic robot
Thermal Soaring and Control Surface Dynamics of an Eagle and the Hummingbird’s Flapping Flight Aerodynamics
Authors: Dutta Prantik , Chaugule Samruddhi
Published: October 2022

Abstract: This review tends to shed light on the eagle’s aerodynamic attributes along with its inbuilt structural control surfaces that facilitate its high maneuverability. Apart from this, few aspects of the eagle’s wing morphing techniques, its aerofoil, and its aerodynamic stability are also being highlighted. The aim is to highlight the bio-mimicable traits of an eagle which can be incorporated into bionic UAVs. This work acts as a base for current and future works involving slotted wingtips and bionic control surfaces. The traits discussed are being used to design mechanical control surfaces and wingtips that resemble the eagle’s slotted wings and control surfaces. These works when combined with compliant mechanisms can help improve roll and yaw control of a UAV along with drag reduction. This review also highlights the aerodynamics of flapping; specifically of the hummingbird. From the hummingbird’s aerodynamics to its hovering techniques; all of its main features are being highlighted. These birds have demonstrated a wide range of aerodynamic traits which if mimicked to near perfection could pave the way for new-age drones. Maneuverability and enhanced aerodynamic optimality could be the outset of extreme sustainability measures with these birds paving the way with their evolutionary flight measures. Apart from their aerodynamic traits, a few aspects of their wing morphing techniques and their evolutionary hereditary traits are also being highlighted.
Jerome Bruner's Theory of Learning to Improve Basic School Students' Understanding of Numbers by Learning in Stage
Authors: Febrianti Dewi Netta , Purwaningrum Jayanti Putri
Published: October 2022

Mathematics is a subject that is disliked by most students. This has resulted in a lot of children who are not enthusiastic about this lesson since elementary school. Elementary school is a place where children start knowing what numbers are, what numbers are and how a number looks. Numbers become the basis for children before learning about mathematics. There are so many branches in numbers that children need to know, starting from the basics of numbers, namely natural numbers, developing into whole numbers, whole numbers, and fractions. This is why the methods of learning mathematics must be well determined, at this time many learning methods have emerged with various criteria. Because of this, the writer tries to find the right theoretical solution according to the number material which has developing properties, the method that can be used is the Bruner Theory, which is to learn by understanding the basics first before proceeding with something that is more difficult because mathematics is an abstract concept.
Analysis of Student's Mathematic Communication Ability in Solving Problems of Pattern Procedures in Pythagoras Theorem
Authors: Abdillah Rizka , Cholily Yus Mochamad , Azmi Rizal Dian
Published: October 2022

This study aims at knowing and describing students' mathematical communication skills in problem-solving on Pythagorean theorem material based on Polya's procedure. The Polya's problem-solving phase consists of the stage of understanding problems, planning problem solving, implementing problem-solving plans, and re-examining. The subject of this study were 6 students from eighth-grade of Junior High School which was selected based on good, sufficient, and poor mathematical communication criteria. Moreover, this study employed a descriptive qualitative method where the data was collected by using a test and interview. The results of the study revealed that the students with good mathematical communication capabilities criteria were able to solve the problems based on Polya's procedure. Meanwhile, students with sufficient criteria of mathematical communication capability unable to solve the problem based on Polya's procedure at the stage of making plans by altering mathematical information in the form of picture, students did not realize the need for design actions first, students just go ahead and didn 't see the results of completion that have been made. Additionally, students with poor mathematical communication capabilities were unable to solve the problems based on Polya's procedure, students were not meet at the stage of making plans by changing mathematical information in the form of picture, making plans by using and selecting mathematical information or images to solve the problems, and the students did not look back at the completed results.
Easy Multiplication from Left to Right and Al Khwarizmi Method: Hypothesis Testing Against Median Values
Authors: Susdarwono Endro Tri
Published: October 2022

This study aims to provide an overview of easy multiplication with the left to right method and also the right to left method (Al Khawarizmi Method). Furthermore, from easy multiplication with 2 methods, a test is carried out to determine the level of ease in its application to the two methods of multiplication. The method used in this research is experimental. While the approach in this research used is quantitative. The quantitative approach used includes testing the hypothesis on the median value. The conclusion of this study is that the median value of the posttest value of easy multiplication from left to right and easy multiplication from right to left is the same. Since the median is also the average value, it can also be concluded that the average number of easy multiplication posttest scores from left to right and easy multiplication posttest scores from right to left are the same. As an implication, the two easy multiplication techniques are able to produce the same level of convenience.
Online Teaching and Learning Within the Context Of Covid-19: Exploring the Perceptions of Postgraduate Mathematics Education Students
Authors: Naidoo Jayaluxmi , Singh-Pillay Asheena
Published: October 2022

The COVID-19 pandemic has resulted in education institutions using online pedagogy instead of face to face pedagogy to limit the virus’s spread. In this qualitative, interpretive case study, forty-seven mathematics education postgraduate students’ perceptions of online teaching and learning during the COVID-19 pandemic era are explored. The participants were purposively selected from one university in South Africa. The theoretical lens of Virtual Communities of Practice was used to generate data via three interactive online discussion forums. All data were analysed thematically, and the results reveal that the participants perceived strengths and challenges to online teaching and learning within the ambits of COVID-19. This study concludes with suggestions and implications for online teaching and learning for universities in developing countries.
Students' Perceptions of the Use Equation Editors in Completing Papers Calculus I Class
Authors: Mitra permata ayu
Published: October 2022

Perception is an individual's ability to respond, interpret, and distinguish a view of any information to a stimulus. So the aims of this study was to find out: (1) students' perceptions of the use of an equation editor in writing mathematical notation as assignments for calculus class I papers, (2) students' perceptions of writing calculus I paper assignments using the manual method (handwriting). The research subjects consisted of 16 students majoring in Extension Informatics Engineering (afternoon class) Semester I. The type of research was descriptive qualitative. Data collection techniques are interviews. The analysis stage is to analyze the results of the interviews. The results of the study concluded that: (1) 11 (eleven) students agreed to use the equation editor in writing calculus I paper assignments,the rest were still confused about the use of the equation editor; and (2) all students do not agree if the paper is written using the manual method (handwriting) because the results are not neat and take a long time.
Test the Effectiveness of Mathematics Learning Media Based on Powtoon Animation Video in Junior High School on Two-Variable Linear Equation System Material
Authors: Agustin Himaya , Priyo Utomo Dwi , Slamet Kusumawardana Adi
Published: October 2022

At this time, many students think that learning mathematics is difficult to understand. While Powtoon animation video-based mathematics learning media is still rarely applied, students feel bored. They do not understand the concept of material when the learning process uses the lecture method. The purpose of this study was to determine the effectiveness of using Powtoon animation video-based mathematics learning media on the material for the Two-Variable Linear Equation System in Junior High School. The type of approach used is a pre-experimental quantitative approach by applying a one-group pretest-posttest design. The research population includes all students of class VII-A at SMP NEGERI 1 NGIMBANG for the academic year 2020/2021, with 32 students consisting of 8 male students and 24 female students. Data collection techniques using tests and questionnaire sheets. While the data analysis technique used is normalized gain. The data obtained show differences in students' test results using the Powtoon animated video and before using the Powtoon animated video. The difference was seen from the average score of the students' test results before using the media of 36.41 and after using the media of 92.58. In addition, the research results from the N-Gain Test results show that the use of Powtoon animation video media is effective in learning mathematics. It is evidenced-based on the results of the expert test and media validation by obtaining 85% and 83.75%, which means that it belongs to the outstanding category.

In comparison, the results of the student response questionnaire of 81.29% belong to the outstanding category. Students' test results get an average of 0.88% from the n-gain, which shows a high classification. This study indicates that Powtoon animation video media is effective in learning mathematics compared to learning that only uses the lecture method. 29% of it belongs to the outstanding category, then through the test results, students get an average of 0.88%, which is obtained from the n-gain, which means it shows a high classification. This study indicates that Powtoon animation video media is effective in learning mathematics compared to learning that only uses the lecture method. 29% of it belongs to the outstanding category, then through the test results, students get an average of 0.88%, which is obtained from the n-gain, which means it shows a high classification. This study indicates that Powtoon animation video media is effective in learning mathematics compared to learning that only uses the lecture method.
Development of Web-Based Mathematics Learning to Improve the Mathematical Power
Authors: Setiawan Beni , Sopia Nurapni , Andri Andri
Published: October 2022

This study aims to develop a mathematics learning web to improve the mathematical power of junior high school students through valid, practical, and effective development. This study uses development research methods with the ADDIE development model. The model steps are analysis, design, development, implementation, and evaluation. The research subjects were 30 Class VIII students on SMP Negeri 2 Sintang and SMP Swasta Nusantara Indah Sintang. In this study, product trials consist of expert validation, small-scale trials, and student questionnaires. The analysis technique measures student’s mathematical power using the gain score calculation. The results of the study show (1) a mathematics learning web developed to increase valid mathematical power for junior high school students. (2) the mathematics learning web meets the practical criteria in its use from good student responses, and (3) there is an increase in student’s mathematical power with moderate criteria after learning on the mathematics learning web.
Imagética espacial no capitalismo extrativo: forma e força nos diagramas de responsabilidade social empresarial
Authors: Acselrad Henri , Assis Wendell Ficher Teixeira
Published: October 2022

No capitalismo contemporâneo de fluxos, as corporações cujos negócios dependem de recursos do território recorrem crescentemente a políticas sociais privadas visando favorecer a inserção territorial de seus projetos. Com o propósito de assegurar sua reputação, participam de uma disputa pela representação do espaço social mediante o uso crescente do instrumento visual dos diagramas. Entre os usos empresariais de diagramas, dois são aqui discutidos. Enquanto os diagramas de “responsabilidade social empresarial” pressupõem um espaço harmônico de parceria e cooperação, os mapeamentos ditos “de risco”, para uso interno das empresas, mostram a presença do dissenso e de ameaças ao rumo dos negócios. O texto faz uma leitura crítica da literatura do management empresarial e do material diagramático que a compõe e discute diagramas publicados em relatórios de sustentabilidade e responsabilidade social empresarial de grandes corporações do setor extrativo mineral.
Um evento e alguns cabos de guerra: o Seminário Internacional Criação de Novas Cidades, 1958
Authors: Dedecca Paula
Published: October 2022

O artigo analisa o Seminário Internacional “Criação de Novas Cidades”, promovido no Rio de Janeiro, em 1958, pelo Instituto Brasileiro de Educação, Ciência e Cultura, com a colaboração da União Internacional dos Arquitetos, do Instituto de Arquitetos do Brasil e da Companhia Urbanizadora da Nova Capital. A partir desse evento transnacional, multidisciplinar e interinstitucional, busca-se apreender algumas tensões disciplinares na disputa por legitimidade de modos de pensar e fazer as cidades novas, com foco nas estratégias mobilizadas pelos arquitetos e urbanistas. A análise ancora-se, sobretudo, em registros oficiais do evento e em notícias veiculadas no jornalismo cotidiano carioca, que nos fornecem versões múltiplas sobre os acontecimentos.
Paediatric Facial Malformation - A Case Report
Authors: S Arvinth , K Vindhiya , Kumar Reddy Gaddam Aneesh
Published: October 2022

Arteriovenous malformations (AVMs) are rare congenital vascular malformations. They account for 1.5% of all vascular anomalies. Oral and maxillofacial regions are the common sites and account for 50% of the cases. We report a seven-year-old female child with progressive left cheek swelling for the past two years. There was no pain, dysphagia or difficulty in chewing food. But the swelling caused significant cosmetic concern due to facial disfigurement. There was a history of cystic hygroma, operated at a young age. There is no significant family history of vascular anomalies. Child was investigated and diagnosed to have slow flow vascular malformation. Treatment is a multidisciplinary approach. Minimally invasive procedures can conservatively manage it by injecting drugs. Other options are laser therapy, open surgery and a combination of the above treatments. Our case improved after multiple cycles of foam sclerotherapy. Many cases might not improve with one or two injections, but it requires multiple doses. Arteriovenous malformation is not only a physical problem but also involves psychological concern for the child. Though it may be a benign condition, it might cause facial disfigurement, as in our case. A high index of suspicion is required as it is incidentally diagnosed during dental procedures. Multimodality therapy is necessary for the management and is beneficial in all age groups. The present case is published for its rarity.
Irreversible facial nerve palsy as a revelator of parotid gland cancer
Authors: Marszał Joanna , Bartochowska Anna , Klimza Hanna , Nogal Piotr , Wierzbicka Małgorzata
Published: October 2022

Aim of the study. The goal of the study was to assess the frequency of
malignancies hidden under the diagnosis of “Bell’s palsy”. We aimed to
create diagnostic algorithm to avoid failures concerning patients whose
only symptom of parotid gland cancer was irreversible FNP. Materials and
methods. We analyzed 253 consecutive patients with FNP treated in our
department in the last 5 years. All patients with irreversible FNP were
reassessed in 6-12 months. We underlined all shortcomings in the
diagnostics of those in whom malignancies were found out in MRI of the
neck and presented the proposal of diagnostic algorithm to avoid missing
such an entity. Results. Bell’s palsy was observed in 157 / 253 patients
(62.06%), in 36 / 157 (22.92%) it remained permanent. In 4 / 36
patients (11.11%) with irreversible FNP, which constituted 2.54% of
all “Bell’s palsy” cases, parotid gland deep lobe mass was found out
in MRI. In one patient infiltration of the skull base was diagnosed.
Adenoid cystic carcinoma was confirmed in final histopathology in all
cases. Conclusions. Our experience has shown that irreversible FNP can
be a revelator of the malignant tumor located in the deep lobe of the
parotid gland. Contrast-enhanced MRI covering intra- and extracranial
segments of facial nerve should be ordered in all cases of FNP without
recovery after 4 months. The main point of our study is to underline
that the assessment of the deep lobe of the parotid gland with MRI
should be included in the standard diagnostic protocol in all
irreversible “Bell’s palsy” cases. Key words: Bell’s palsy, facial
nerve palsy, parotid gland cancer
Differences in Sum-of-Hourly and Daily Reference Evapotranspiration for a Rice-Wheat Cropping System in Ganga Basin, India
Authors: Yetbarek Ephrem , Ojha Richa
Published: October 2022

Estimating reference evapotranspiration (ET ) at 24 h
timesteps has been considered sufficiently accurate for a long time.
However, recent advances in weather data acquisition have made it
feasible to apply hourly procedures in ET computation.
Hourly timesteps can improve the accuracy of ET
estimates, as data averaged daily may misrepresent evaporative power
during parts of the day. The objective of the present study is to assess
the differences between daily ET computations
performed on 24 h (ET ) and hourly (ET
) timesteps for rice-wheat cropping systems in the
Ganga Basin, India. The meteorological data for computing reference
evapotranspiration were collected from an automatic weather station
located in an experimental plot at IIT Kanpur, India. Daily and hourly
ET computations were performed according to the FAO-PM
(Allen et al, 1998) equation for rice and wheat cropping seasons.
Diurnal variations of meteorological parameters resulted in
underestimation of ET when the daily time step is
considered. No significant difference was observed during wet periods.
It is also observed that the hourly estimates of ET
were able to capture the abrupt changes in climate variables, while the
daily ET fails to get it as it considers the average
values only. As a result, the sums of hourly values are more reliable
for ET estimates in the Ganga Plains.
Lonicera floral traits change to adapt to environmental variabilities
Authors: Chen Wenkai , Wang Jinniu , Du Jie , Sun Jian , Wang Chunya , Wu Yan
Published: October 2022

Species in Lonicera genus are magic elves with excellent
adaptability to varying environments with the aid of the divergent
morphological and color pattern variation. Flowers undergo strong
selection of both biotic and abiotic factors with species-specific
morphology and color strategies. Take Lonicera nervosa (L.
nervosa) and Lonicera tangutica (L. tangutica) as
representative species, two sister taxa of Lonicera widespread in
alpine to subalpine ecosystems in the same region, which present ideal
subject in terms of evolution and adaptation of flowers to determine
underlying ecological implications with close evolutionary relationship:
(1) both species present differentiation in floral structure, corolla
orientation and anther position; (2) L. nervosa has constant
color while L. tangutica undergoes color change during
florescence (3) Both species share the same pollinators, distribution
and specimen coordinates show that the two species of Lonicera
have similar distribution centers.
The backward problem for radially symmetric time-fractional diffusion-wave equation under Robin boundary condition
Authors: Shi Chengxin , Cheng Hao
Published: October 2022

This paper is devoted to solve the backward problem for radially
symmetric time-fractional diffusion-wave equation under Robin boundary
condition. This problem is ill-posed and we apply an iterative
regularization method to solve it. The error estimates are obtained
under the a priori and a posteriori parameter choice rules. Numerical
results show that the proposed method is efficient and stable.
Weak Galerkin finite element method for linear poroelasticity problems
Authors: Zhou Chenguang , Gu Shanshan , Chai Shimin , Zhou Jinhui
Published: October 2022

In this paper, we develop a weak Galerkin (WG) finite element method for
a linear poroelasticity model where weak divergence and weak gradient
operators defined over discontinuous functions are introduced. We
establish both the continuous and discrete time WG schemes, and obtain
their optimal convergence order estimates in a discrete $H^1$ norm
for the displacement and in $H^1$ and $L^2$ norms for the
pressure. Finally, we present some numerical experiments on different
kinds of meshes to illustrate the theoretical error results, and
furthermore verify the locking-free property of our proposed method.
Factors associated with negative conversion of viral RNA in hospitalized children infected with SARS-CoV-2 Omicron Variant in Shanghai, China
Authors: Yang Yan , Xue Zheng , You Yannan , Liu Yazun , Geng Lina , Huang Lirong , Zhou Huan , Piao Xiang , Liu Xiao , Wu Mingyun , Wang Yajuan , Zhou Lili , Wang Peng , Shen Shiping , Hu Mingge , Han Zhaopeng
Published: October 2022

Abstract Objectives: This study aimed to identify the related risk
factors and potential predictors of SARS-CoV-2 RNA negative conversion
by describing the dynamics of viral shedding in infected children
admitted to two hospitals from Shanghai during Omicron variant outbreak.
Methods: This retrospective cohort included laboratory-confirmed cases
of SARS-CoV-2 infection from Shanghai between March 28 and May 31, 2022.
Clinical characteristics, personal vaccination, household vaccination
rates were collected through electronic health records and telephone
interviews. Results: The total of 603 pediatric cases confirmed with
COVID-19 was included in this study. Both Univariate and multivariate
analysis were performed to filter independent factors for the duration
to viral RNA negative conversion. Data on cases re-detected SARS-CoV-2
after showing negative results on RT-PCR test (intermittent negative
status) were also analyzed. The median duration of virus shedding was
12(Interquartile Qange,IQR: 10-14) days. The severity of clinical
outcome, personal vaccination-2doses, household vaccination rates,
abnormal defecation were factors indecently affecting negative
conversion of SARS-CoV-2 RNA, suggesting that patient who had abnormal
defecation or with more severe condition would delay virological
clearance, while patient accepted 2 doses vaccination or with higher
household vaccination rates would accelerate virological clearance. Loss
of appetite (Odds Ratio (OR) :5.343; 95%CI: 3.307-8.632) and abnormal
defecation (OR:2.840; 95%CI: 1.736-4.645) were significantly associated
with intermittent negative status. Conclusion: These findings could
provide clues for early identification of pediatric patients with
prolonged viral shedding, enriching the evidence for development of
prevention and control strategies especially the vaccination policies
for children and adolescents.
Existence and nonexistence of nontrivial solutions for the Schrödinger-Poisson system with zero mass potential
Authors: Liao Fangfang , Wang Xiaoping
Published: October 2022

In this paper, we study the existence and nonexistence of nontrivial
solutions for the following Schrödinger-Poisson system with zero mass
potential { − △ u + ϕu = − a | u | p − 2 u + f ( u )
, x ∈ R 3 , − △ ϕ = u 2 , x ∈ R 3 , where a>0 and p
∈ ( 2 , 12 5 ) . We obtain the existence of nontrivial radial solutions
and the nonexistence of nontrivial solutions for the above system under
weaker assumptions on a and f. In particular, applying our
results to the following system: { − △ u + ϕu = − | u
| p − 2 u + | u | q − 2 u , x ∈ R 3 , − △ ϕ =
u 2 , x ∈ R 3 , a sufficient and necessary condition is obtained on the
existence of nontrivial radial solutions.
Сlinical case of acute opsthorchiasis in endoscopy
Authors: Aksenova T. E. , Aleksandrova Yu. А. , Avdoshina D. D. , Tkachev S. N. , Medvedev K. V.
Published: October 2022

A clinical case of one of the most common parasitic diseases in the Russian Federation, opisthorchiasis, is presented. Today, opisthorchiasis and its associated complications are an urgent problem in medicine. Parasitic invasions are in fourth place in terms of damage to public health. There is no specific clinical picture, and the predominance of latent forms makes it difficult to diagnose opisthorchiasis. Particular attention is paid to the issue of complications, the most significant of which are acute pancreatitis, purulent cholangitis, liver abscesses, perforation of the bile ducts with the development of bile peritonitis. In the chronic course of invasion, parasitism occurs in the host‘s hepatobiliary tract, production of toxic and immunogenic waste products, and disruption of cell metabolism, which is one of the factors contributing to the development of cancer of the bile ducts and pancreas. The relevance of the problem of opisthorchiasis and its complications, combined with the complex and vulnerable diagnosis of this disease (clinical, laboratory, instrumental), demonstrate the importance of finding effective methods for its detection.
Incidence of acute intestinal infections in Saint Petersburg during COVID-19 pandemic
Authors: Potapova T. V. , Ermolenko K. D. , Kholin A. V. , Stalevskaya A. V. , Gordeeva S. A. , Razdyakonova I. V.
Published: October 2022

The results of a study of modern epidemiological and characteristics of acute intestinal infections against the backdrop of the COVID-19 pandemic are presented. The article reflects current trends in the frequency of detection of acute intestinal infections of viral and bacterial etiology, in particular, the growing prevalence of norovirus infection is shown. Particular attention is paid to the increase in the incidence of salmonellosis and campylobacteriosis. An increase in the incidence of salmonellosis in 2019 by 25.7% is shown, which is higher than the average long-term incidence rate by 28.1%. Age features of the incidence of viral and bacterial intestinal infections among children have been established. Given the widespread use of antibiotics or other drugs that change the intestinal microbial landscape (cytostatics, chemotherapy drugs), as well as a significant increase in the number of hospitalizations of patients, there is a high risk of developing antibiotic-associated diarrhea. Undoubted attention requires the problem of registration, diagnosis of clostridium infections, which make it difficult to obtain data on the prevalence of infection caused by Clostridium difficile in the Russian Federation and St. Petersburg. The article discusses in detail the possibilities for further improvement of measures to prevent the transmission of acute intestinal infections.
The development of spontaneous intermuscular bleeding in patients with a new coronavirus infection in an infectious disease hospital
Authors: Nesvit E. M. , Medvedev K. V. , Erofeev A. A. , Protchenkov M. A.
Published: October 2022

Today the new coronavirus infection remains one of the most important problems of modern medicine. Among patients requiring hospital treatment, the development of various extrapulmonary complications is quite common. The work is devoted to the study of spontaneous hematomas of various localization against the background of a severe course of a new coronavirus infection treated in an infectious hospital in the period from 2020 to 2021. During the selected time, 17 patients had spontaneous hematomas of various localizations (anterior abdominal wall, retroperitoneal space, neck, hip, chest). The paper investigates the effectiveness of instrumental diagnostics – computed tomography in vascular mode is recognized as the optimal method, which helps to identify not only the location of the hematoma, but also in some cases its source. The basic principles of the tactics of choosing methods of hemostasis (medical, mechanical, surgical) to achieve its sustained effectiveness are described.
Features of the development and clinical course of pneumothorax in patients with a new coronavirus infection
Authors: Medvedev K. V. , Borta K. E. , Protchenkov M. A. , Valyukh E. I.
Published: October 2022

New coronavirus infection (COVID-19) is a modern global problem that requires the rapid development of diagnostic and treatment methods, as well as the study of pathological effects on body tissues. Due to severe damage to the respiratory organs, special attention is paid to the study of pneumothorax as a manifestation of gas syndrome, one of the complications of COVID-19.

The purpose of the study was to assess the incidence of pneumothorax as a complication of COVID-19, the features of the development of the pathological process, and to determine the criteria for treatment tactics.

Materials and methods. In total, for the period from April 2020 to May 2022 at the Clinical Infectious Diseases Hospital named after. S.P. Botkin treated 31532 patients with a confirmed diagnosis of COVID-19. As part of this study, the case histories of 316 patients with clinical manifestations of gas syndrome were retrospectively analyzed. All patients were diagnosed with COVID-19, the diagnostic criterion of which was a positive result of the PCR test – the detection of RNA in a swab taken from the nasopharynx and oropharynx.

Results. Analysis of case histories showed that severe COVID-19 occurs in all age groups. Collapse of half of the lung was observed in most cases (59 patients). The main treatment method for pneumothorax was Bulau drainage. At the same time, in 47 patients (32%) this method required active aspiration. In 37 patients (26%), drainage was corrected and the pleural cavity was re-drained. In 37 patients, the result of hospitalization was a fatal outcome, the main causes of which were severe pneumonia and/or severe immunodeficiency, 75 patients (52%) were discharged from the hospital in a stable condition.

Conclusions. The occurrence of pneumothorax in patients with COVID-19 is characterized by late onset, protracted course, the formation of purulent complications and a high incidence of fatal outcomes, which do not always correlate with the severity of pneumonia.
The course of COVID-19 in newborns
Authors: Pavlenko Yu. A.
Published: October 2022

Clinical Infectious Diseases Hospital. S.P. Botkin has been providing assistance to pregnant women and newborns suffering from COVID-19 since the beginning of the pandemic. In the period from April 2020 to April 2022, 550 newborns born to mothers suffering from COVID-19 of varying severity were observed in the hospital, of which 52 children had a registered diagnosis of COVID-19 (the SARS-CoV-2 virus was identified in a swab from the nasopharynx of a newborn using PCR). In this paper, an analysis of the pathological changes identified in this category of newborns was carried out, the issues of the influence of the covid status of the mother and the duration of stay with her on the child’s condition were studied. Analysis of the results of the work revealed a relationship between the duration of the period of stay of a newborn with a mother with an active form of COVID-19 and the severity of the disease in newborns. According to our clinical observations, the vertical route of transmission of the virus seems highly probable. Newborns who have had COVID-19 or have perinatal contact with SARS-CoV-2 are subject to dynamic observation. It is necessary to determine the order, timing and scope of dispensary observation for the timely detection of pathological changes in this category of children.