bluuebunny/crossref_metadata_2025 huggingface dataset:
The specifics of chemical sedimentation of calcium ions from diluted aqueous solutions
Authors: Radovenchyk Vіacheslav , Hordiienko Kateryna , Radovenchyk Yaroslav , Krysenko Tamara
Published: July 2022

Increasing the hardness of natural waters requires the introduction of mitigation systems in offices and private homes and apartments, where it is impossible to implement heating and settling of water, typical of traditional technologies. The efficiency of soda - lime softening of water in conditions of low temperatures and in the absence of settling has been studied very little. Therefore, the purpose of this work was to study the features of soda - lime softening under different conditions in terms of its use in household and office systems. The specifics of calcium carbonate formation process during diluted aqueous solutions softening for home or office were researched. At temperatures of 13 - 18 °C, the formation of calcium carbonate requires significant reagents overconsumption compared to stoichiometry, which is a negative factor for the application of this process in such conditions. In addition the reagents quantity cannot be comparable with the obtained effect. Increased 5 times soda dose reduces the total hardness of the treated water only twice. Even increased 10 times soda dose cannot reduce the residual hardness of the treated solution lower 0.6 mg-eq/dm3. Also there is no clear dependence of the settling intensity on the ratio of components. The pH increasing is less effective than temperature increasing. The process of formation sediment also depends on changing these parameters. It was found that in a neutral medium at temperature 30 °C and initial water hardness of 8 mg-eq/dm3 only single flakes of calcium carbonate were occurred in the solution. By further heating, the number of such individual flakes constantly increases and at 70 °C they were occurred even without treatment with sodium carbonate. Increasing pH up to 8.4 at 40 °C was accompanied by solution turbidity, and after treating by precipitant the instantaneous formation of a white fine precipitate was observed in all water volume. Increasing pH up to 10 reduces solution turbidity temperature to 30 °C and the instantaneous formation of calcium carbonate particles started at this temperature. It was also found that water softening is more effective with its big initial hardness. At the water temperature 13 °C calcium ions are sedimented quite intensively under certain conditions. The ratio between concentrations of carbonate ions and calcium ions K = [CO32-, mg-eq] / [Ca2+, mg-eq] is a determining factor. This is especially noticeable in the range of coefficient K from 0 to 15. Further increasing of carbonate ions dose did not provide a noticeable effect, regardless of the initial water hardness. However, even in such conditions, the use of such method at low temperatures and without settling has quite low efficiency and can’t be used for water softening in office or home conditions.
A Method of Investigating the Phenomenon of Bifurcation Memory in the Dynamics of River Vessels
Authors:   HSE University, Chernyshov A. V. ,   Nizhny Novgorod State Technical University named after R. E. Alekseev, Chernyshova S. A.
Published: July 2022

The phenomenon of “bifurcation memory”, which can be detected during the steering of river vessels, is considered by researchers with the questions of equilibrium point’s bifurcations. It was noticed that in some dynamic systems during saddle-node bifurcation, areas are formed on the phase plane (so-called “phase spot”), passing through which the phase velocity of the representative point decreases. A decrease in phase velocity (e. g. during the steering of river vessel) can cause navigation accidents during shallow waters navigation. In order to improve sailing safety, it is necessary to investigate topological features of phase spots under any possible environmental conditions and steering angle values. In this paper, we propose a new method that makes it easy to get information about the localization of regions with decreased phase velocity. We gained the results related to the topology of areas of different types of motion (accelerated or decelerated) of representative point. In addition, the paper presents the process of evolution of these regions, according to the change of steering angles, as well as before and after the bifurcation. The new method, offered in the article, is more accurate for determining the boundaries of the areas compared to the methods of Feigin and Chirkova. This will allow us to make more correct predictions of changes in the dynamics of the object. The practical implication of the suggested method is that by using it, we can get information about the location of areas with different types of motion of the representative point on the phase plane for different values of steering angle and environmental conditions. This information can be used in the control algorithm of the driving object, for example, in order to predict the decreasing of phase velocities.
Application of the Kudryashov Method for Finding Exact Solutions of the Schamel – Kawahara Equation
Authors:   Departamento de Matemáticas Aplicadas y Sistemas, Universidad Autónoma Metropolitana-Cuajimalpa, González-Gaxiola O. ,   Posgrado en Ciencias Naturales e Ingeniería, Universidad Autónoma Metropolitana-Cuajimalpa, León-Ramírez A. ,   Departamento de Matemáticas Aplicadas y Sistemas, Universidad Autónoma Metropolitana-Cuajimalpa, Chacón-Acosta G.
Published: July 2022

Recently, motivated by the interest in the problems of nonlinear dynamics of cylindrical shells, A. I. Zemlyanukhin et al. (Nonlinear Dyn, 98, 185–194, 2019) established the so-called Schamel – Kawahara equation (SKE). The SKE generalizes the well-known nonlinear Schamel equation that arises in plasma physics problems, by adding the high-order dispersive terms from the Kawahara equation. This article presents families of new solutions to the Schamel – Kawahara model using the Kudryashov method. By performing the symbolic computation, we show that this method is a valuable and efficient mathematical tool for solving application problems modeled by nonlinear partial differential equations (NPDE).
Changing the Dynamic Parameters of Localized Breather and Soliton Waves in the Sine-Gordon Model with Extended Impurity, External Force, and Decay in the Autoresonance Mode
Authors:   Bashkir State University, Ekomasov E. G. ,   Institute of Molecule and Crystal Physics Ufa Federal Research Centre of RAS, Nazarov V. N. ,   University of Tyumen, Samsonov K. Yu.
Published: July 2022

Possibility of changing the dynamic parameters of localized breather and soliton waves for the sine-Gordon equation in the model with extended impurity, variable external force and dissipation was investigated using the autoresonance method. The model of ferromagnetic structure consisting of two wide identical layers separated by a thin layer with modified values of magnetic anisotropy parameter was taken as a basis. Frequency of external field is a linear function of time. The sine-Gordon equation (SGE) was solved numerically using the finite differences method with explicit scheme of integration. For certain values of the extended impurity parameters a magnetic inhomogeneity in the form of magnetic breather is formed when domain wall passes through it with constant velocity. The numerical simulation showed that using special variable force and small amplitude it is possible to resonantly increase the amplitude of breather. For each case of the impurity parameters values, there is a threshold value of the magnetic field amplitude leading to resonance. Geometric parameters of thin layer also have influence on the resonance effect — for decreasing layer width the breather amplitude grows more slowly. For large layer width the translation mode of breather oscillations is also excited. For certain parameters of extended impurity, a soliton can form. For a special type of variable field with frequency linearly dependent on time, soliton is switched to antisoliton and vice versa.
Spectral Properties of Low-order Dynamo Systems
Authors:   Institute of Continuous Media Mechanics, Okatev R. ,   Institute of Continuous Media Mechanics, Frick P. ,   Department of Physics, Lomonosov Moscow State University, Sokoloff D.
Published: July 2022

The solar 11-year activity cycle is a famous manifestation of magnetic activity of celestial bodies. The physical nature of the solar cycle is believed to be large-scale magnetic field excitation in the form of a wave of a quasi-stationary magnetic field propagating from middle solar latitudes to the solar equator. The power spectrum of solar magnetic activity recorded in sunspot data and underlying solar dynamo action contains quite a stable oscillation known as the 11-year cycle as well as the continuous component and some additional weak peaks. We consider a low-order model for the solar dynamo. We show that in some range of governing parameters this model can reproduce spectra with pronounced dominating frequency and wide spectral peaks in the low-frequency region. The spectra obtained are qualitatively similar to the observed solar activity spectrum.
A Hybrid AI-driven Algorithm to Uncover Potential Therapeutic Targets for COVID-19 Using Network-based Drug Repurposing
Authors: Marchi Carlos , Corrêa Martins Jr. David
Published: July 2022

The COVID-19 was described as a respiratory illness, however further studies recognize it as a complex heterogeneous multisystemic disorder. Global efforts have been proposed to combat COVID-19, emerging diverse therapeutic options, in which discovering new drug therapies, development of vaccines and drug repurposing have been considered the most promising approaches to fight the virus. This study aimed to repurpose known drugs for use against the COVID-19, finding better therapeutic options. Seventeen biological databases were used in this study. The genetic algorithm (GA) was performed for a set of drug target classes and COVID-19 proteins as input, whose drug candidates are obtained according to the target similarities found in the target-target similarity predictive network, resulting in a drug-target interaction network. Thus, recommended drugs correspond to the union of the drug subsets found during each GA execution. Twenty-eight drugs were indicated to be the best therapeutic targets for the virus, in special, the Cyclosporine drug was administered as adjuvant to steroid treatment for COVID-19 patients which showed positive outcomes, reducing mortality in moderate and severe cases. The drugs found have used to treat other diseases, evidencing that the COVID-19 is a multisystemic disorder and suggests that the viruses’ mechanism of action presents some comorbidity with other human diseases. Evidence shows that the drugs found in this research might act together to fight the virus in a broader fashion, however further studies including in vitro and in vivo experiments are needed to find the best combination of these drugs.
“LET ALONE AT MISS UNIVERSE”: SIERA BEARCHELL AS EMBODIMENT OF CULTURAL RESISTANCE OF FEMININITY IN MISS UNIVERSE
Authors: Quamilla Asyifa
Published: July 2022

The existence of plus size contender in Miss Universe has broken down the normalization of slenderness which has been one of manifestations of femininity in American society and its beauty pageant industries. The plus size lens is brought by Siera Bearchell who has been placed on Top 9 in Miss Universe 2016 edition to resist the cultural normalization of slender body size. By using textual analysis, this research focuses on Siera Bearchell’s YouTube videos and news articles related to the plus size contender to investigate the way she embodies the cultural resistance through her personal practices in the Miss Universe pageant. This research shows that Siera Bearchell has failed at embodying the dominant ideology of feminine slender ideal in Miss Universe. However, this failure cannot put Siera Bearchell to cultural obedience to the bodily ideal. This occurs since Siera Bearchell has resisted the cultural normalization by embodying her plus size body as a state for personal space and freedom. Therefore, the symbol of normalization of feminine slender size contradicts her identity as the plus size contender. 
Bipolar Electrostatic Driving of Isolated Micro-Resonator for Sensing High Voltage of Battery Output with Resolution
Authors: Nobunaga Naoki , Kumagai Shinya , Sasaki Minoru ,   Toyota Technological Institute 2-12-1 Hisakata, Tenpaku-ku, Nagoya, Aichi 468-8511, Japan,   Meijo University, Nagoya, Japan
Published: July 2022

Electrostatic Si resonator was applied to sense the voltage at the facing electrode in a highly isolated approach. The resonant frequency shifts under the effect of the electrical field from the facing electrode connected to the high voltage (corresponding to the battery). Here, two resonators are fabricated. The electrical isolation was obtained by driving the resonators to be floated electrically. The charging of the resonator causes the fluctuation of the driving performance, degrading the sensing resolution. The driving voltage was set to be bipolar to avoid the fluctuation. This novel method stabilizes the resonant frequency realizing 0.25 V accuracy against 80 V. Feasibility for measuring the voltage up to 420 V is demonstrated.
PROCEDURE OF EXPERIMENTAL RESEARCHES OF THE TECHNICAL CONDITION OF SLOTTED HYDRAULIC PULVERIZERS FOR SELF-PROPELLED SPRAYING MACHINES
Authors: Melnyk Viktor , Sirovitskiy Kiril , Shuliak Mykhailo , Pankova Oksana
Published: July 2022

The method of experimental researches of technical condition of hydraulic slotted hydraulic pulverizers of self-propelled spraying machines for establish a connection between theoretical modeling and research data of influence of their technical condition on spray quality is offered in article. Based on the analysis of recent attainments and publications, the insufficiency of modern methods and tools for diagnosing and substantiating the parameters of slotted hydraulic pulverizers for chemical plant protection of self-propelled spraying machines was revealed. The developed technique and laboratory stand allow to carry out a qualitative assessment of the technical condition of slotted hydraulic pulverizers of self-propelled spraying machines in operation and to carry out effective defecting of new pulverizers. It was found that the technical condition of the pulverizer significantly affects the quality of technological operations for the use of liquid chemicals to intensify crop production
DETERMINATION OF THE PARTIAL ACCELERATION OF A TWO–AXLE VEHICLE WITH ALL–HANDLED WHEELS
Authors: Klets Dmytro , Dubinin Yevhen , Pelypenko Yevhen , Baidala Vladislava
Published: July 2022

The proposed method allows evaluating an automobile handling with or without accounting withdrawal, with various types of drive wheels and various steering wheels using partial acceleration. Determination of lateral and tangential reactions on automobile tire while turning in view tire slip allows more accurate evaluating of automobile maneuverability, stability and handling. Determination of vehicle total and partial angular accelerations during its driving into rotation with and without accounting withdrawal allows developing an vehicles handling improving algorithm with different tire types. Using of different ways in vehicle managing is complicating associated with machine design and control process by machine handling characteristics changing during applying the locking devices. The equations of front-wheel drive vehicles and all-wheel drive vehicles rotational motion when driving on curves without removal are the same. Appearance of new ways to perform maneuvers such as turning movement with all the drive wheels (4WS), requires researching of movement trajectory, stability and handling of machines during specified maneuvering. The partial acceleration method allows the assessment of the controllability of vehicles with different types of drives (front-, rear - and all-wheel drive) and with different steerable wheels. The determination of lateral reactions on the wheels of the vehicle when turning allows for a more accurate assessment of the agility, stability and handling of vehicles
EVALUATION OF WEAR RESISTANCE OF FRICTION SURFACES FOR DISC BRAKES OF PASSENGER CARS
Authors: Nazarov Alexander , Krivoshapov Sergey , Tsybulsky Vadim , Sergienko Nikolay
Published: July 2022

A mathematical model of wear of friction surfaces of disc brake mechanisms of a passenger car during braking is proposed. For passenger cars, the work of the created algorithm is considered, the results of the program and the analysis of the results of the computational experiment are given. The prospects for further research to determine the wear resistance coefficient of materials for mating parts of disc brake mechanisms are also considered.
MATHEMATICAL MODEL OF THE ACCELERATION PROCESS OF A WHEELED TRACTOR WITH CONSIDERING THE FUEL SUPPLY AND THE OPERATION OF THE HYDRO-CLAMPING CLUTCH
Authors: Kozhushko Andrii , Trembach Oleksiy , Boltenko Sergiy
Published: July 2022

Analysis of Ukrainian production of wheeled tractors shows its rapid decline, due to many reasons, the main of which is the obsolete use of tractor technology, which affects the technical and operational performance, ergonomic and others. Today, most foreign wheeled tractors use the latest technology in the design of internal combustion engines, transmissions and wheeled engines. In particular, there is a greater bias towards the use of continuously variable transmissions. In order to create real competition for domestic producers, it is necessary to implement modern solutions, which is not possible without quality cooperation with scientists. Therefore, the material of this article aims to form guidelines for mathematical modeling of the dynamics of the wheeled tractor, taking into account the operation of the main clutch, hydraulic clutch and fuel control in the internal combustion engine. In solving this goal, a technique was used that provided mathematical modeling of the crankshaft of an internal combustion engine with the available harmonic components, as well as the ability to control the fuel supply. The simulation of the transmission operation was based on classical approaches in the study of the dynamic load of the power plant, taking into account the operation of the main clutch and hydraulic clutches. As a result, the dependences of the change of technical and operational parameters of the wheeled tractor at the stage of start-up and acceleration are obtained. The practical significance of the work lies in the possibility of its use in assessing the performance of a wheeled tractor, which is equipped with preselective and continuously variable transmissions, as well as a transmission that uses dual-clutch technology.
METHOD FOR PREDICTION OF DURABILITY OF FRICTION LININGS OF TRACTOR BRAKES
Authors: Podryhalo Mykhailo , Kashkanov Andrei , Shein Vitalii , Kasianenko Oleksii , Uzhyk Valerii
Published: July 2022

The paper presents the results of a research on the creation of a methodology for predicting the durability of friction linings of tractor brake mechanisms at the design stage. Not only an increase in engine power and tractor weight is taken into account, but also the installation of more advanced brake mechanisms. Thanks to the developed method for predicting the durability of the friction linings of tractor brake mechanisms, the use of unified disc brakes is justified.

To solve the problem, the similarity theory was used, in which the most intense loading mode of the tractor brake mechanisms was modeled. As an indicator, the maximum work performed by the brakes until the friction linings are completely worn out was used. The results of estimating the resource of the friction linings of the tractor brake mechanisms under the most intense loading conditions were compared with the results of the calculation under the actual loading conditions.
PSYCHOLOGICAL AND PEDAGOGICAL CONDITIONS FOR THE FORMATION OF EMOTIONAL INTELLIGENCE IN FUTURE TEACHERS OF HIGHER EDUCATION
Authors: Romanovska Olena
Published: July 2022

The theoretical bases of the problem of formation of skills of self - regulation at future teachers of higher school are covered in the work, features are revealed; substantiated and tested the psychological and pedagogical conditions for the formation of self-regulation skills in future teachers of higher education; methodical recommendations for teachers are developed.
An analysis of circuit design solutions of single-phase voltage control relays for household consumers
Authors: Zorin Yevhenii
Published: July 2022

This paper pays attention to a circuit design solutions of single-phase voltage control relays for protection of household consumers of electrical energy from unacceptable voltage deviations within power supply network using the examples of some manufacturers. An overview and description of electrical drawings of analog voltage control relays, based on comparators, and digital ones, as a modern version on the basis of microcontrollers, are carried. The conducted overview and analysis systematizes information on the design, technical and functional features of the electrical circuits and components of the mentioned relays and demonstrates the prospects for development of voltage relay circuitry. The electrical drawings have been illustrated by the author, and the algorithm of their operation is described in detail. A generalization and conclusion are made concerning the components of the functional circuits in the voltage control relay for protection of household consumers.
Combined models of electricity consumption
Authors: Kalinchyk Vasyl , Pobigaylo Vitaliy , Kalinchyk Vitaliy , Meita Aleksandr , Borychenko Olena
Published: July 2022

The article investigates models and methods of electric load forecasting. It is shown that among the known methods of power consumption management, preference is given to those based on the use of forecast estimates. The analysis of works devoted to the issues of forecasting the processes of power consumption management systems of industrial enterprises is carried out. It is shown that it is expedient to use adaptive models as a basis for operative forecasting of loads of power supply systems of industrial enterprises. Analysis of adaptive models of electricity consumption forecasting based on the method of exponential smoothing showed their high efficiency and good adaptability to changes in the process of electricity consumption. It is shown that the greatest difficulty in forecasting are cases of abrupt changes in the development of the process. Abrupt changes in the process can lead to a violation of pre-existing qualitative relationships of the parameters of the projected system. If the jump is the transition of the predicted system from one steady state to another, the model of exponential smoothing with correction of the constant smoothing has the best adaptability to this kind of change. At the same time, changes of the "pulse" type are worked out by the model with a certain delay, which leads to an increase in the standard error of the forecast. Therefore, the model's response to change slows down. To eliminate this circumstance, a forecasting procedure based on combined models is proposed. The paper considers two models of combined forecasting - a combined model of joint processing of forecasting results and a combined model of selective type. Experimental studies of the considered models are carried out.
Innovation Business of Unique Wall Clock as an Effort for Utilizing Cardboard Waste
Authors: Serevina Vina , Khoiriyyah Ana Mulyaningrum  , Amelia Dea
Published: July 2022

One of the innovations that can be developed to ‎manage cardboard waste into objects of economic value is to make handicrafts in ‎the form of wall clocks made from cardboard waste. The purpose of this research is to reduce cardboard waste innovatively so that it has a high selling value. In this activity, the method used is a situation survey and ‎the process of making unique wall clocks from collecting cardboard waste to the ‎formation of the final product. This product produces quite promising profits. The sales observation process is carried out for ‎two periods with a cycle per year, sales results are observed based on the cash ‎flow statement, balance sheet, and income statement. Observations show that ‎sales generate increased profits from year to year. This product has a high enough business ‎feasibility to increase people's income. In addition, this product is expected to be ‎able to benefit the environment and society so that environmental pollution can ‎be reduced. However, there is a threat caused by the development of time other ‎innovations from the same raw materials emerge and the trend of wall clocks that ‎are increasingly developing every time can also slow down the development of ‎this business.
Mitigation Training in Preparation of Face-to-face Learning in Schools under Health Reviews during Pandemic
Authors: Stujanna Endin Nokik
Published: July 2022

The Covid-19 pandemic has hit the whole world, including Indonesia. This pandemic has greatly impacted all sectors, including education. Online learning process has many obstacles and brings serious impacts. As a result, the policy of implementing face-to-face learning during pandemic was issued. Mitigation training is very important. This training attempts to discuss face-to-face learning at schools and obtain representative opinions regarding the preparation and consideration based on health reviews in relevant with the latest research and recommendations. This online training was held with the participants involving teachers and parents (n=219) from Elementary and Junior High School of Al-azhar SummareconSerpong, and has been shared on YouTube platform. Several opinions were obtained from parents who disagree with face-to-face learning’s idea. It also increased the knowledge regarding mitigation of face-to-face learning at schools. The education aspect is indeed something that must become a priority, but without compromising the student’s health aspect.
Design and Development of Web-based Commerce for SMEs in East Jakarta
Authors: S. Dedi Purwana E. , Monoarfa Terrylina Arvinta , Febrilia Ika
Published: July 2022

This activity is a “Design and Development of a Web-Commerce-based Strategy for Promotion of Micro, Small and Medium Enterprises for SMEs in the East Jakarta Region.” This is motivated by various obstacles experienced by SMEs when they are not sufficiently competitive with competitors in the market. The disruptive era has driven changes in various aspects of life, including market behavior. It is undeniable that business digitization plays a very important role in business activities. For this reason, this program aims to make SMEs especially those in the East Jakarta area able to be competitive through the designed Web-Commerce, which is named lapaksenggol.com. The lapaksenggol.com web-commerce is a promotional media that can be used optimally by SMEs in the East Jakarta area to make it easier to expand market share and get closer to consumers. In addition, in the long term, the existence of lapaksenggol.com Web-Commerce will increase consumer awareness of the existence of SMEs, build networking with other business units, and increase market confidence in SMEs. As a result of the collaboration with the East Jakarta Regional Cooperative, SMEs and Trade Sub-Department, the soft launching of the lapaksenggol.com web-commerce was carried out on June 22, 2021, and the socialization of lapaksenggol.com to SMEs in East Jakarta on August 19, 2021.
Utilization of Quizizz as a Learning Medium for Elementary Teachers in Cisauk District
Authors: Wijayanti Sri Hapsari , Prasadja Heru , Pasau Anthony Devonico Putera , Andreas Aurelius
Published: July 2022

Digital competence is a competency that must be possessed by teachers in the digital era. However, this skill turned out to be a big obstacle during the covid-19 pandemic. Many teachers have not been able to take advantage of technology, so in learning, there are still those who rely on WhatsApp as a learning tool. Elementary school teachers in Cisauk District who are members of PGRI (Persatuan Guru Republik Indonesia) reported that student learning outcomes during the covid-19 pandemic were no better than before and they realized that students were less motivated. The purpose of this community service activity is to improve the knowledge and ability of teachers in Cisauk District in using Quizizz. This activity was held in virtual training for 46 teachers and school principals. The methods used are discussion, demonstration, assignment, monitoring, mentoring, and evaluation. The teacher is given the task of making a Quizizz and testing it for their students in class. Teachers are also accompanied and guided in completing assignments. From the results of the training, teachers showed an increase in knowledge and skills using Quizizz. Quizizz also has a positive response from students.
Penerapan Metode Eksperimen untuk Meningkatkan Prestasi dan Motivasi Belajar Siswa pada Topik Usaha dan Pesawat Sederhana
Authors: Imeske Anggreni , Sholikhan  , Ain Nurul
Published: July 2022

Metode eksperimen merupan suatu cara penyajian mata pelajaran dimana siswa secara aktif mengalami dan membuktikan sendiri apa yang sedang dipelajarinya. Melalui metode eksperimen siswa secara total dilibatkan dalam melakukan sendiri, membuktikan dan menarik kesimpulan sendiri tentang suatu objek, keadaan atau proses tertentu.Tujuan penelitian ini adalah untuk mengetahui Penerapan Metode EksperimenUntuk Meningkatkan Prestasi Fisika, Motivasi Belajar Siswa Pada Materi Usaha Dan Pesawat Sederhana Kelas VIII SMP Negeri 03 Ampelgading. Penelitian ini dilaksanakan pada ajaran 2020/2021 di SMP Negeri 03 Ampelgading. Metode penelitianan ini adalah siswa kelas VIII C yang terdiri dari 27 siswa, 17 orang siswa laki-laki dan 10 orang siswa perempuan tahun ajaran 2020/2021. Instrument yang di gunakan dalam penelitian ini adalah lembar observasi keterlaksanaan metode eksperimen, tes berupa soal uraian 5 soal. Perbedaaan pada metode eksperimen yaitu pada siklus I 67,85%, sedangkan pada siklus II 94,04%, antara siswa belajar menggunakan metode eksperimen pada tahap pra siklus sebesar 14,81%, kemudian 18,52% dan 77,78% . Motivasi pada tahap siklus I sebesar 68,42%, siklus II 80,24%.

 

Kata Kunci: Metode Eksperimen, Prestasi Belajar, Motivasi
Estructura factorial y de red de una escala breve de soledad (RULS-6) en adolescentes peruanos
Authors: Ramos-Vera Cristian , Guzmán Choquehuanca Jenny , Serpa Barrientos Antonio
Published: July 2022

La soledad es un fenómeno psicológico que puede afectar a la salud de los adolescentes. Genera una gran sensación de aislamiento social, amenaza personal y falta de control que puede llevar a una mayor vulnerabilidad a desarrollar algún trastorno mental. Sin embargo, hasta ahora no se cuenta con una medida de soledad adaptada en adolescentes hispanos. El objetivo fue validar la medida de 6-items Revised UCLA Loneliness Scale (RULS-6) en adolescentes peruanos. El estudio incluyó a 456 adolescentes peruanos (49% eran mujeres) estudiantes de nivel secundaria entre 12 y 17 años (M = 14,57, DT = 1,64). Primero se realizó la traducción y la revisión lingüística de la escala de soledad revisada de la UCLA. Luego se procedió a la calificación de una versión adaptada recientemente de seis ítems (RULS-6) mediante la evidencia de validez basado en el contenido. Posteriormente, se realizó el análisis factorial confirmatorio, que presentó resultados óptimos de la unidimensionalidad del instrumento y su fiabilidad. Asimismo, se analizó la invarianza entre hombres y mujeres y según grupos de edad, que permitió determinar la equivalencia entre los grupos categóricos de hombres y mujeres y según la edad (entre 12 y 14 años y, 15 y 17 años). Finalmente se realizó el análisis de red para evaluar las relaciones entre los elementos del RULS-6. Los resultados refieren que la medida RULS-6 es una prueba unidimensional consistente y fiable, que arroja resultados válidos en adolescentes peruanos
Validation of the Children’s Inventory of Anger (ChIA) with a Mexican sample
Authors: Gallegos-Guajardo Julia , Ruvalcaba-Romero Norma , Chávez-Amavizca Ania , Martinez-Torteya Cecilia
Published: July 2022

The Children’s Inventory of Anger (ChIA) is a self-report measure that assesses the level of anger experienced by children and youth. Anger is a significant predictor of aggression, peer relationships difficulties and antisocial behavior; therefore, is crucial to have a valid and reliable measure to evaluate it. The purpose of this study was to validate the ChIA for the Mexican children (ChIA-M). Participants were 638 students (M = 9.8 years; SD = 1.51), 49% were females from primary and secondary Mexican public schools. The exploratory factor analysis supported the four-factor structure with a shared variance of 47.60%, but a different distribution of items. The confirmatory factor analysis indicated the model to be an acceptable fit with the data χ 2 (338) = 1089.75, p ≤ .001, NFI = .82; IFI = .907, CFI = .906, RMSEA = .047. Good internal consistency was obtained for Total score α = .94 and subscales: Frustration α = .90, Aggression α = .88 , Peer Relationships α = .76 and Authority Relations α = .81. Convergent and divergent validity was supported through positive and significant correlations with the Anger Inventory for Mexican Children and the negligible correlations with the Children Questionnaire of Positive Emotions. Results suggest that the Spanish version of the ChIA for Mexican population is a valid and reliable measure of child anger. However, attention should be paid to the cultural differences related to the experience of anger. Further research should continue evaluating the ChIA with clinical samples and children from different ages and regions in Mexico
Keterampilan Menulis Deskripsi menggunakan Media Gambar Berseri pada Siswa Kelas IV SDN Mentoro
Authors: Nastiti Ratih Arum , Setyowati Eny , Ardhyantama Vit
Published: July 2022

Penelitian ini bertujuan untuk mengetahui keterampilan menulis deskripsi menggunakan media gambar berseri pada proses pembelajaran .Jenis penelitian ini merupakan penelitian kualitatif. Subjek penelitian ini adalah siswa kelas IV SDN Mentoro yang berjumlah 28 siswa. Metode pengumpulan data diperoleh dari observasi, wawancara, tes, dan dokumentasi. Teknik analisis data menggunakan reduksi data, penyajian data, dan penarikan kesimpulan. Hasil analisis data menyimpulkan bahwa : Keterampilan menulis deskripsi menggunakan media gambar berseri siswa kelas IV SDN 2 Mentoro dengan kategori tinggi sebesar 71%, kategori sedang 18%, dan kategori rendah 11%. Kendala yang dihadapi siswa dalam menulis deskripsi yaitu siswa merasa kesulitan dalam menuangkan ide ke dalam bentuk kata atau kalimat, serta siswa merasa kesulitan dalam menulis ejaan dan tanda baca yang yang benar dalam sebuah tulisan.
Penguatan Pendidikan Karakter Disiplin Melalui Program Asrama Al-Manar di Universitas Muhammadiyah Ponorogo
Authors: Santoso Budi , Tang Ambo , Jumadi Jumadi
Published: July 2022

Pendidikan merupakan sarana untuk mencentak yang tidak hanya cerdas secara otaknya tetapi juga memiliki karakter atau budi pekerti yang baik. Penelitan ini bertujuan untuk mengetahui Implementasi Pendidikan Karakter disiplin di Rusunawa Al-Manar Universitas Muhammadiyah Ponorogo melalui program asrama Al-manar. Metode penelitian menggunakan metode kualitatif pendekatan studi kasus. Pengambilan data dengan cara observasi, wawancara dan dokumentasi. Hasil penelitian menunjukan bahwa implementasi karakter dilakukan dengan cara perencanaan, pelaksanaan dan evaluasi. Hasil implementasui pendidikan karakter disiplin Rusunawa Al-Manar melalui: Disiplin ketika masuk Asrama di Rusunawa Al-Manar, Disiplin ketika mengambil makan malam dan Disiplin ketika bangun malam. Dampak Implementasi Pendidikan Karakter berbasis Asrama di Rusunawa Al-Manar di Universitas Muhammadiyah ponorogo dapat dilihat dari pengakuan alumni santri. Diantaranya; sisiplin dalam bangun pagi, membaca Al-Qur’an, shalat Tahajjud dan Dhuha bahkan ada yang dipercaya menjadi Khatib tetap dalam ibadah shalat Jum’at.
Study Investigates Deepwater BOP Technology, Reliability
Authors: Carpenter Chris
Published: July 2022

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper IPTC 21430, “Deepwater Subsea BOP Technological and Reliability Advancement,” by Mahesh Picha, SPE, Malik Faisal Abdullah, and Ashutosh Rai, Petronas, et al. The paper has not been peer reviewed. Copyright 2021 International Petroleum Technology Conference. Reproduced by permission.

Subsea blowout preventer (SBOP) reliability is a major challenge in deepwater drilling and completion operations, accounting for a large portion of major equipment failures and nonproductive time (NPT) costs annually. The complete paper focuses on SBOP technological advancement since the Macondo incident in 2010, with emphasis on reliability, equipment-condition monitoring, and statistical root-cause analysis. The development of new technologies has targeted overall cost optimization of the well life cycle but also has been aimed at assuring SBOP functionality.

Introduction

Drilling contractors are required to establish minimum standards of redundancy and reliability of their SBOP systems and are required to implement an auditable risk-management process to ensure that their SBOP systems operate above minimum standards. A 2015 study found that 38% of NPT events were related to SBOP issues. Of this 38%, 56% were associated with maintenance, 22% with manufacturing issues, 16% with not following operational procedures, and 6% with training time. Because maintenance-related NPT was the major contributor, a detailed analysis was performed and found that frequency of the maintenance cycle, insufficient detailing of maintenance procedures, a lack of specific tools, insufficient spare parts onboard, and unavailability of technical documentation were responsible.
Complement Factor I Deficiency, a study on prevalence and impacts on complement dysregulation and health.
Authors: Kelly Lauren , DeDent Andrea , Patterson Aneeka Hancock , Selters Linday , Lovejoy Christopher , Sowers Rebeka , Holten-Andersen Lars , Frazer-Abel Ashley , Moan Natacha Le
Published: July 2022

Background: The complement system plays a central role in innate immune response with the recognition and elimination of pathogens through direct killing and/or stimulation of phagocytosis. The complement system is composed of a complex proteolytic cascade of more than 50 soluble and membranous proteins among which the complement Factor I (FI) is a key protease that regulates the cascade through inactivation of C3b and C4b and their downstream effect in terminal membrane attack complex (MAC) formation. A deficiency or absence of endogenous FI results in uncontrolled spontaneous activation of the alternative pathway, leading to continuous, massive consumption of complement component 3 (C3). Low levels of C3 may, in turn, reduce phagocytic activity, opsonization, and antibody production, as well as impair immune complex metabolism. As such, FI deficiency can result in an increased susceptibility to infections by encapsulated bacteria and/or an increased incidence of autoimmune and immune-complex diseases. Methods: By using a data harmonization method, we created a repository for quantitative interrogation of FI deficiency phenotype and its associated complement markers across 135 cases. In addition, we generated Cfi-/- rats to establish a model that recapitulates the complement biomarker imbalance observed in FI deficient individuals.Results: Bacterial infections are the most predominant clinical phenotype in FI deficient individuals. Our analysis highlights symptoms often begin early in childhood with ~70% of the cases reported in children < 18 years old, further supporting that FI deficiency is a pediatric disorder. The complement imbalance observed in FI deficient individuals is recapitulated in Cfi-/- rats.Conclusions: We provide the first robust meta-analysis of FI-deficiency of 135 cases described in the literature and established a new tool to evaluate future therapeutic agents for their capacity to treat FI deficiencies.
Assessment the effect of graphene and graphene oxide on antibiotic resistance genes during copper-contained swine manure anaerobic digestion
Authors: Zhang Ranran , Li Jiming , Zhou Liuyuan , Zhuang Haifeng , Shen Sihan , Wang Yuheng
Published: July 2022

The metals added to swine feed to promote livestock growth could be important selectors for antibiotic resistance genes (ARGs) because of metal–antibioticcross-resistance and/or coresistance. This study investigated the effects of grapheme and grapheme oxide on ARGs during the anaerobic reactors containing copper. The abundances of 15 ARGs, 4 mobile genetic elements (MGEs), 5 heavy metal resistance genes (HMRGs), and the bacterial communities were determined.The additives ofgraphene and graphene oxide both can reduce ARGs abundance in varying degrees with the anaerobic reactors that contained a higher concentration of copper. What’s more, graphene decreased the abundances of ARGs more effectively than graphene oxide. Most ARGs significantly correlated with Firmicutes, Bacteroidetes, Spirochaetes, and Verrucomicrobiaat phyla level. Network and redundancy analyses demonstrated that alterations in the bacterial community were mainly associated with the changes in ARGs. In anaerobic digestion products, Firmicutes, Bacteroidetes, and Spirochaetes were enriched lower in graphene reactor than graphene oxide. This may be the main reason that graphene is superior to graphene oxide to reduced ARGs abundance. Additionally, this study demonstrated that ARGs were closely with HMRGs than MGEs in the addition of graphene reactors. Nevertheless, the driver of MGEs in graphene oxide reactors for ARGs are higher than HMRGs. Therefore, we speculatethe decreased of HMRGs by graphene and MGEs by graphene oxide further improved their effects for ARGs reduced.
Climate change impacts on food system security and sustainability in Bangladesh
Authors: Chowdhury Md. Monirul Islam , Rahman Syed Masiur , Amran Md Iqram Uddin Al , Malik Karim , Abubakar Ismaila Rimi , Aina Yusuf Adedoyin , Rahman Sheikh Mohammad Abdur , Khan Maqbool , Muhyedeen Musah Ahmed , Hasan Md. Arif
Published: July 2022

Climate change threatens the security and sustainability of the global food system. In Bangladesh, the fragile food system is strongly being impacted by climate variability and extreme weather events. Estimates indicate that the agricultural sector could lose about USD7.7 billion per annum due to climate change. The average annual rice production could decline by 33% within two decades. However, a few studies investigated the impacts of fluctuating temperature and rainfall, flash floods, drought, and saline water intrusion on the food system and security in an integrated manner. This study examines climate change impacts on food system security and sustainability in Bangladesh. It reviews the country’s food system, the climatic conditions that threaten food security, and impacts climate change on the food systems and the associated vulnerabilities. The study then assesses the existing adaptation initiatives and the extent of their integration among pertinent stakeholders. It concludes that local climate change adaptation strategies and stakeholder collaboration are necessary for reducing climate change impacts on food system security.
Robust Structural Superlubricity under Gigapascal Pressures
Authors: Xu Zhiping , Sun Taotao , Gao Enlai , Jia Xiangzheng , Wang Zhou , Ma Ming , Zheng Quanshui
Published: July 2022

Structural superlubricity (SSL) is a state of contact between two sliding surfaces with no wear and ultralow friction. SSL has been characterized at contacts with van der Waals (vdW) layered materials, while its robustness under high pressure has not been assessed. Here we report experimental results showing that incommensurate vdW interfaces between graphite can maintain the state of SSL under the pressure of no lower than 9.45 GPa, and the vdW contact between a tungsten tip and graphite substrate remains stable up to 3.74 GPa, even higher than the strength of most solids. Beyond this critical pressure, wear is activated, signaling the breakdown of vdW contacts and SSL. This unexpected strong pressure resistance and wear-free feature of SSL signals a wear mechanism beyond the Archard law. Atomistic simulations reveal the microscopic processes of SSL breakdown, which originates from lattice destruction at the vdW contact by pressure-assisted bonding, triggering wear through shear-induced tearing of layered vdW materials. The correlation between the breakdown pressure and material parameters for a number of vdW contacts was analyzed. The results show that the bulk modulus and the first ionization energy, are the most relevant factors, which indicate the combined structural and electronic effects. The critical pressures of several metal/graphite contacts could exceed the strength of metals, demonstrating the robustness of SSL. These findings offer fundamental understandings of wear at the vdW contacts, and could guide the design of SSL-derived applications.
Reprogramming of glycometabolism caused by low-level lead in vascular smooth muscle cells
Authors: Xu Li-Hui , Duan Huan-ren , Zhang Yu , Zhang Tong-jia , Liu Ya-shu , Zhou Jin-sa , Hu Wen-xiu , Zhang Huan , Shi Wan-ying , Sun Su-ju
Published: July 2022

Background: Lead induces cardiovascular disease in humans and animals. Changes in the structure and function of vascular smooth muscle cells (VSMCs) are the cytopathological basis of many cardiovascular diseases. The present study investigated the effects of low-level lead on oxidative stress and carbohydrate metabolism in rat VSMCs. Materials and Results: VSMCs were cultured in media with 0 μM (control group) 、0.25 μM、1 μM lead acetate for 24 h. Low-level lead exposure caused oxidative stress damage to vascular smooth muscle cells, increased level of Reaction oxygen species (ROS) and reduced glutathione (GSH) in VSMCs were detected compared with that in control group (P< 0.05). Compared with the control group, the decreased activity of PKM2, LDH and HK, the key enzymes for oxygen-free oxidation in lead-exposed group (P< 0.05) were detected. The key oxygen-oxidation enzyme PDH in the lead-exposed group was detected and the activity was reduced (P< 0.05), while the PDK1 content increased (P< 0.05). The activity of G-6-PD, a key enzyme of the pentose phosphate pathway, and the product NADPH increased (P< 0.05) in the lead-exposed group. Moreover, the Intracellular glucose content significantly increased in the lead-exposed group (P< 0.05).Conclusion: Low-level lead exposure leads to oxidative stress damage in VSMCs and enhances pentose phosphate pathway flow by improving the metabolic efficiency of the glutathione redox cycle, while disrupts the glycometabolism of VSMCs, inhibits anaerobic and aerobic oxidative processes, causing glycometabolism reprogramming in VSMCs. These findings may be the molecular mechanism for cardiovascular disease induced by low-level lead.
Spatiotemporal differences and influencing factors of high-quality utilization of land resources in the Yellow River Basin of China
Authors: Li Weiming , Cai Zhaoyang
Published: July 2022

High-quality utilization of land resources (HULR) is related to security of land ecosystem and sustainable development of socio-economy. To promote the HULR, we explored the spatiotemporal differences and influencing factors of HULR in the Yellow River Basin (an important ecological barrier in China) by using entropy method, spatial panel regression model, and geographically and temporally weighted regression model. We found that the HULR values were 0.22 to 0.28 from 2008 to 2019, showing an increasing trend with obvious spatiotemporal differences. The spatial connectivity, technological innovation, industrialization, industrial upgrading, and marketization are important factors influencing HULR, and different factors have different spatial effects in different regions. Therefore, the important principle of HULR in the Yellow River Basin is to pursue the coordinated development of human and land according to regional characteristics. We hope that this research can provide references for the HULR around the world.