bluuebunny/crossref_metadata_2025 huggingface dataset:
Redes sociales: atracción y riesgo para jóvenes
Authors: Quintero Barco Yeiler Alberto
Published: June 2022

In the present applied research, the attendance taking wasdigitized, improving the effectiveness and efficiency of saidtaking, through the use of biometric devices connected toa database supported on a platform specifically designedfor said task, providing an adequate control tool andconsultation, both for teachers, students and other members of the competent academic body to access the information that is stored automatically and in real time, when reporting attendance in the fingerprint reader located in the place of counseling defined by the staff in charge. This project improved the quality of the data collection process of assistance to theconsultancies of the integrative projects by the teacher to the students, who should occupy an assigned place according to the corresponding days and hours. With the present applied research, it was possible to facilitate registration through fingerprint readers, implemented and supported on innovative technology, properly programmed for this purpose, providing a higher level of confidence in terms of the veracity of the information entered and at the time of registration. consultation, since it is very difficult to falsify a fingerprint, this would give a greater degree of confidence in the information.
Essentials of computing systems
Authors: Fernandes João M.
Published: June 2022

Computers were originally invented to solve all sort of mathematical problems. Nowadays, computers do much more than that and are present in all human activities. In fact, a computer is a fantastic machine capable of doing the most amazing tasks, if an appropriate program is provided. A computer system contains hardware and system software that work together to run software applications. Interestingly, the underlying concepts that support the construction of a computer are relatively stable. In fact, (almost) all computer systems have a similar organisation, i.e., their hardware and software components are arranged in hierarchical layers and perform similar functions. This book was written for programmers and software engineers who want to comprehend how the components of a computer work and how they affect the correctness and performance of their programs.
The influence of online-based hypnoteaching methods on the biology learning outcomes of class xi students
Authors: Yarni May , Kusuma Berliana Cakra
Published: June 2022

This study aims to improve student learning outcomes by applying Online-Based Hypnoteaching Learning Methods. The method used is quasi-experimental. The sample consisted of 69 students selected randomly. Data collection uses pretest and post-test with learning outcomes test instruments. The experimental class n-gain test has an index score of 59.1%, which means relatively effective, while the control class has an index score of 31.0%, which means ineffective. The result of learning outcomes proves significant differences between the two categories. Student responses using the models strongly agree between 49.12% and 43.00%. The assumption test shows that the data were normally distributed and homogeneous. The hypothesis test is obtained Tcount (4.46) Ttable (1.99), indicating the influence of the application online-based hypnoteaching learning model in improving the learning outcomes of student classes in 11th-grade science classes.
The effect of science process skills of students argumentation skills
Authors: Darmaji Darmaji , Astalini Astalini , Kurniawan Dwi Agus , Triani Elza
Published: June 2022

This study aims to compare students' learning skills in each class and students' argumentative abilities in each class and to determine the effect of students' science process skills on students' argumentation abilities. This type of research uses the mixed method with an explanatory design. The samples of this study were 70 students of class 11 science, with the sampling technique of simple random sampling. The results of data analysis using parametric statistics t-test (2-tailed) obtained sig. value 0.034 0.05, so it can be said that the students' argumentative abilities in XI A and IPA B are different, and for the variable science process skills, the sig. is 0.043 0.05, so each class's science process skills are different. The results of the regression test obtained the results of the sig value of 0.025 in class XI A, and class XI B obtained a sig value of 0.030, where the value of sig 0.05 which means that science process skills affect the students' argumentation skills. The study confirms that the improvement of scientific skills will make student better at conveying arguments.
Perturbation and bifurcation analysis of a gonorrhoea dynamics model with control
Authors:   Department of Mathematics and Statistics, Alex Ekwueme Federal University, Ndufu-Alike, Nigeria, et al. Omenyi
Published: June 2022

A model for the transmission dynamics of Gonorrhoea with control incorporating passive immunity is formulated. We show that the introduction of treatment or control parameters leads to transcritical bifurcation. The backward bifurcation coefficients were calculated and their numerical perturbation results in different forms of equilibria. The calculated effective reproduction number of the model with control is sufficiently small. This implies asymptotically stability of the solution, thus, the disease can be controlled in a limited time.
Влияние ионного облучения на электронный транспорт в тонких пленках YBCO
Authors: Антонов А.В. , Мастеров Д.В. , Михайлов А.Н. , Морозов С.В. , Павлов С.А. , Парафин А.Е. , Тетельбаум Д.И. , Уставщиков С.С. , Юнин П.А. , Савинов Д.А.
Published: June 2022

The disorder effect on superconducting properties of thin-film YBCO nanostructures in external magnetic fields is experimentally studied. The disorder was produced by irradiation with xenon ions. The research included transport measurements of narrow bridges based on HTSC YBCO films (thickness 50 nm) in strong magnetic fields (up to 12 T). Thus, for samples with different degrees of disorder, critical dependencies have been studied, i.e. the Hc2(T) phase transition line, the Hirr(T) irreversibility line, etc. The dependences of the mean-free path and critical temperature on the concentration of defects created by ion irradiation have been experimentally studied. The experimental data are described using formulas obtained within the framework of well-known models, such as the Ginzburg-Landau theory, the Drude theory and the Gorkov equations.
Особенности эпитаксиального роста YBCO в окнах задающей маски
Authors: Мастеров Д.В. , Павлов С.А. , Парафин А.Е.
Published: June 2022

This work is devoted to the study of epitaxial YBCO films obtained by laser sputtering during deposition of YBCO into the windows of the special preliminary topology mask. The morphology of the surface of the obtained structures was studied by electron microscopy, the electrical characteristics of superconducting bridges were measured: the critical temperature and the critical current density. The possibility of forming YBCO structures of a given topology with defect-free regions of micron sizes while maintaining high electrophysical parameters of the superconductor is shown. This opens up the possibility of reproducibly forming submicron-scale elements in the created defect-free areas using ion etching or ion implantation.
Исследование структуры и электрических свойств нанокомпозитных пленок W-=SUB=-x-=/SUB=-Si-=SUB=-1-x-=/SUB=-
Authors: Хыдырова С. , Михайлова И.В. , Васильев Д.Д. , Моисеев К.М. , Барков К.А. , Ивков С.А. , Буйлов Н.С. , Керсновский Е.С.
Published: June 2022

An experimental investigation of the structure and phase composition by X-ray, Raman, and ultrasoft X-ray emission spectroscopy, as well as the study of the electrical properties of WxSi(1-x) films used as sensitive elements of superconducting single-photon detectors (SNSPD), depending on the thickness in the range from 7 to 80 nm, was carried out, according to the results of which it was found that the W3Si phase is presumably formed in films 20 and 40 nm thick with a resistivity of 8.4 10-5 and 6.0 10-5 Ω cm, respectively, containing the WSi2, W5Si3, and SiO2 phases, as well as WOx and a small share of β-W. Films with a thickness of 7 nm have the highest resistivity of 18.0 10-5 Ω·cm and contain nanocrystals, WSi2, SiO2, as well as β-W, and an amorphous silicon phase. Films with a thickness of 80 nm (the resistivity is also 18.0 10-5 Ω·cm) predominantly contain WSi2, as well as W5Si3 and SiO2, and, presumably, the W3Si phase.
Компьютерное моделирование наноскопических фазово-неоднородных состояний и фазовых диаграмм ВТСП купратов и никелатов
Authors: Москвин А.С. , Панов Ю.Д. , Улитко В.А.
Published: June 2022

More than 35 years of experience in the study of cuprate superconductors shows that the main characteristics of the phase diagram can only be obtained by taking into account mesoscopic static/dynamic phase inhomogeneity as a key property of these materials. Within a minimal model for the CuO2 planes with the on-site Hilbert space reduced to only three effective valence centers [CuO4]7-,6-,5- (nominally Cu1+,2+,3+) with different conventional spin and different orbital symmetry we propose a unified non-BCS model that allows one to describe the main features of the phase diagrams of doped cuprates within the framework of a simple effective field theory. Using Maxwell's construction, the global nature of the electronic phase separation in the CuO2 planes of HTSC cuprates is established, which makes it possible to understand and explain many fundamental features of the physics of the normal and superconducting state of cuprates, including the mechanism of formation of the HTSC and pseudogap phase. The features of phase-inhomogeneous states and their evolution with temperature and doping degree, including the special role of the impurity potential in cuprates/nickelates with nonisovalent substitution, are considered for particular examples of the charge triplet model in the framework of the classical Monte Carlo method.
Спин-волновые резонансы в диффузионном слое эпитаксиальной пленки ЖИГ
Authors: Тихонов В.В. , Губанов В.А. , Садовников А.В.
Published: June 2022

It is shown that in a tangentially magnetized film of iron yttrium garnet exist two types of resonances - a homogeneous ferrimagnetic resonance in the region of the film's homogeneous magnetization (outside the diffusion layer), and inhomogeneous spin-wave resonance within the thickness of the diffusion layer. A method of calculating the magnetization distribution over the film thickness using measured frequencies of the spin-wave and ferrimagnetic resonances.
The method of mathematical modeling has established that the magnetic inhomogeneity of the transition layer layer introduces significant distortions of the oscillation epure at the frequency of the spin-wave resonance, and the nature of the distortions significantly depends on the magnitude of the magnetizing field. The results of the conducted can be useful for nondestructive control of the layered structure of YIG epitaxial films.
Управление запрещенными зонами в пермаллоевой структуре при изменении профиля меандра
Authors: Губанова Ю.А. , Губанов В.А. , Ногинова Н. , Садовников А.В.
Published: June 2022

Control modes of band gap in meander-shaped permalloy (NiFe) thin films have been investigated by the method of micromagnetic modeling. The electrodynamic problem is considered by the finite element method and the dispersion characteristics of spin waves are obtained when the geometrical parameters of the meander are changed. The character of changes in the frequency ranges of the Bragg band gaps depending on the meander profile has been investigated. The results can be used to create devices for microwave signal processing, microwave filters and systems with spatio-temporal division of the signal.
Особенности формирования запрещенных зон при многомодовом распространении спиновых волн в магнонных кристаллах
Authors: Мартышкин А.А. , Бегинин Е.Н. , Шешукова С.Е. , Шараевский Ю.П. , Никитов С.А. , Садовников А.В.
Published: June 2022

The dynamics of spin waves during their multimode propagation in a magnonic crystal, which is an irregular narrow ferrite waveguide with periodic boundary modulation, has been studied by the method of Mandelstam-Brillouin spectroscopy. The transformation of the mode composition of spin waves propagating in an irregular ferrite waveguide is shown. The space-time dynamics of spin waves and the characteristics of the band gaps of a magnonic crystal are experimentally studied, and the possibility of controlling the frequency-selective properties of such a structure is shown. By excitation of a superposition of even or odd width modes of the ferrite microstructure, it becomes possible to control the position of the band gaps of a magnonic crystal. The results of the experiment agree with the results of micromagnetic modeling of the propagation and transformation of the spectrum of spin waves propagating in a ferromagnetic periodic structure.
Управление направлением распространения спиновых волн в ансамбле латерально и вертикально связанных ферритовых микрополосок
Authors: Хутиева А.Б. , Акимова В.Р. , Бегинин Е.Н. , Садовников А.В.
Published: June 2022

Методом численного моделирования показана возможность управления направлением распространения спиновых волн в ансамбле латерально и вертикально связанных микрополосок железо-иттриевого граната (ЖИГ). С помощью метода конечных элементов проведен расчет величины длины связи спиновых волн в латеральной и вертикальной геометриях. Численное значение коэффициентов связи спиновых волн находилось методом конечных элементов в результате решения системы уравнений Максвелла с тензором магнитной проницаемости полученным из линеаризации уравнения Ландау--Лифшица. Методом интегрирования уравнения связанных волн показана возможность изменения направления распространения спин-волнового сигнала в рассматриваемой структуре. Полученные в микромагнитном моделировании спектры прохождения сигнала свидетельствуют об изменении характера локализации мощности спиновой волны в выходных секциях микроволновода при изменении частоты на входе структуры. Система латерально и вертикально связанных микроволноводов представляет собой элемент межсоединений для трехмерных топологий магнонных сетей, демонстрируя при этом функциональные возможности пространственно-частотного демультиплексирования сигнала. Ключевые слова: спиновые волны, магноника, латеральные структуры, магнонный кристалл, ансамбли связанных структур.
Исследование интерференции поверхностных магнитостатических волн с помощью обратного спинового эффекта Холла
Authors: Никулин Ю.В. , Кожевников А.В. , Высоцкий С.Л. , Селезнев М.Е. , Хивинцев Ю.В. , Филимонов Ю.А.
Published: June 2022

The effect of EMF generation due to the inverse spin-Hall effect during the propagation of surface magnetostatic waves (SMSW) in the structure of yttrium iron garnet (YIG) - platinum based on a two-layer YIG film with different saturation magnetizations of the layers ((4πM_1>4πM_2 ) has been experimentally studied. It was shown that the magnitude of the EMF resonantly increases at the frequencies of hybridization of the MSSW with the exchange modes of the structure. At the same time, at the frequencies of the MSSW of the layer with a higher magnetization, oscillations of the EMF are observed, caused by its hybridization with the exchange modes of both the layer with 4πM_1 and the layer with lower magnetization, which indicates the influence of interlayer exchange on the efficiency of spin pumping in the structure under consideration.The influence of the interference of counterpropagating MSSWs on the generated EMF has been studied.It has been shown that the EMF value is sensitive to the phase difference between counterpropagating MSSWs and oscillates.In this case, the amplitude of the oscillations is determined by the ratio of the wavelength of the MSSW and the length of the platinum film.
Ферромагнитный резонанс в обменно-связанных магнитных вихрях
Authors: Татарский Д.А. , Скороходов Е.В. , Миронов В.Л. , Гусев С.А.
Published: June 2022

Приводятся результаты исследования низкочастотного ферромагнитного резонанса в системе двух перекрывающихся пермаллоевых дисков методом магнитно-резонансной силовой спектроскопии. Показано, что резонансная частота гиротропной моды колебаний магнитных вихрей в данной системе существенно зависит от направления завихренности их оболочек. Экспериментальные зависимости резонансных частот различных состояний от внешнего магнитного поля качественно согласуются с результатами микромагнитного моделирования. Ключевые слова: ферромагнитный резонанс, магнито-резонансная силовая спектроскопия, магнитные вихри.
3D Fe3O4-decorated Nitrogen-doped Graphene Aerogel as a Highly Durable Electrocatalyst for Oxygen Reduction Reactions
Authors:   School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China, Yu Jia , Jing Haiyan ,   School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China, Wu Zongdeng ,   School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China, Liu Boyuan ,   School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China, Lei Wu ,   School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China, Hao Qingli ,   School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Published: June 2022

The rational design of efficient electrocatalysts for oxygen reduction reaction (ORR) is the key to developing fuel cells and metal-air batteries. Carbon-supported iron-based materials, as the most promising electrocatalysts for ORR, have drawn much attention as they are cost-effective and exhibit high activity. In this work, a three-dimensional (3D) Fe3O4-decorated N-doped graphene aerogel (Fe3O4/NGA) catalyst was synthesized following a simple hydrothermal method which was followed by an annealing process. The complex formed between Fe2+ and phenanthroline was first used as the precursor of iron and nitrogen sources to synthesize Fe3O4 nanocrystals. Benefiting from the synergistic effect between the uniformly distributed Fe3O4 nanoparticles and the 3D porous N-doped graphene aerogel, Fe3O4/NGA exhibits good electrocatalytic activity with a half-wave potential of 0.81 V. It also exhibits excellent selectivity with low HO2- yield (<5%), and excellent long-time stability. The encouraging results demonstrate that the Fe3O4/NGA composite catalyst is a promising candidate that can be used for the fabrication of non-precious electrocatalyst for ORR.
Factors related to the behavior of seeking health services in community experiencing symptoms of covid-19
Authors: Tonasih Tonasih , Nurjanah Nunung
Published: June 2022

Background: Coronavirus is a group of viruses that can cause disease in animals or humans. Positive confirmed cases of Covid-19 in Cirebon Regency, West Java, during 1-28 August 2020 reached 193 people while the number of deaths due to Covid-19 in Cirebon City, West Java, again increased by 17 people died. The causes of Covid-19 death include patients receiving late treatment due to the less than optimal level of occupancy in the treatment area and monitoring of COVID-19 patients who are self-isolating. In addition, it is also caused by isoman patients with severe symptoms, patient overload, scarcity of drugs and oxygen, the health system is not ready, the health sub-system of community empowerment has failed. there are still many people who still consider being exposed to the corona virus as a disgrace, so they don't want to go to health facilities. People who are sick in many areas, are still seen as tainted, condemned, unkind people. does not want to be tested, does not want to report, because he has a social burden.
Purpose: This study aims to determine the factors related to the behavior of seeking health services in the community if experiencing symptoms of Covid-19 in Cirebon.
Methods: This study used a cross sectional design. This research was conducted at Arsy Medika Clinic, Cirebon Regency and Akbid Muhammadiyah Clinic, Cirebon City on 18-25 September 2021 and obtained a sample of 87 respondents.
Results: The results showed that most of the respondents were 20-29 years old, the gender of the respondents was female, the respondent's education was high school, the respondent's occupation was not working, married, received information from television, there was a relationship between age and education with health service seeking behavior, and there was no relationship between age and education. there is a relationship between gender, occupation, marital status, information media, and knowledge with health service seeking behavior.Conclusion: This study shows that there is a relationship between age and education with health service seeking behavior, and there is no relationship between gender, occupation, marital status, information media, and knowledge with health service seeking behavior.
The Drivers of Acceptance of Artificial Intelligence–Powered Care Pathways Among Medical Professionals: Web-Based Survey Study (Preprint)
Authors: Cornelissen Lisa , Egher Claudia , van Beek Vincent , Williamson Latoya , Hommes Daniel
Published: June 2022

BACKGROUND

The emergence of Artificial Intelligence (AI) has been proven beneficial in several health care areas. Nevertheless, the uptake of AI in health care delivery remains poor. Despite the fact that the acceptance of AI-based technologies among medical professionals is a key barrier to their implementation, knowledge about what informs such attitudes is scarce.

OBJECTIVE

The aim of this study was to identify and examine factors that influence the acceptability of AI-based technologies among medical professionals.

METHODS

A survey was developed based on the Unified Theory of Acceptance and Use of Technology model, which was extended by adding the predictor variables perceived trust, anxiety and innovativeness, and the moderator profession. The web-based survey was completed by 67 medical professionals in the Netherlands. The data were analyzed by performing a multiple linear regression analysis followed by a moderating analysis using the Hayes PROCESS macro (SPSS; version 26.0, IBM Corp).

RESULTS

Multiple linear regression showed that the model explained 75.4% of the variance in the acceptance of AI-powered care pathways (adjusted R2=0.754; F9,0=22.548; P<.001). The variables medical performance expectancy (β=.465; P<.001), effort expectancy (β=–.215; P=.005), perceived trust (β=.221; P=.007), nonmedical performance expectancy (β=.172; P=.08), facilitating conditions (β=–.160; P=.005), and professional identity (β=.156; P=.06) were identified as significant predictors of acceptance. Social influence of patients (β=.042; P=.63), anxiety (β=.021; P=.84), and innovativeness (β=.078; P=.30) were not identified as significant predictors. A moderating effect by gender was found between the relationship of facilitating conditions and acceptance (β=–.406; P=.09).

CONCLUSIONS

Medical performance expectancy was the most significant predictor of AI-powered care pathway acceptance among medical professionals. Nonmedical performance expectancy, effort expectancy, perceived trust, and professional identity were also found to significantly influence the acceptance of AI-powered care pathways. These factors should be addressed for successful implementation of AI-powered care pathways in health care delivery. The study was limited to medical professionals in the Netherlands, where uptake of AI technologies is still in an early stage. Follow-up multinational studies should further explore the predictors of acceptance of AI-powered care pathways over time, in different geographies, and with bigger samples.
A Scalable Risk-Scoring System Based on Consumer-Grade Wearables for Inpatients With COVID-19: Statistical Analysis and Model Development (Preprint)
Authors: Föll Simon , Lison Adrian , Maritsch Martin , Klingberg Karsten , Lehmann Vera , Züger Thomas , Srivastava David , Jegerlehner Sabrina , Feuerriegel Stefan , Fleisch Elgar , Exadaktylos Aristomenis , Wortmann Felix
Published: June 2022

BACKGROUND

To provide effective care for inpatients with COVID-19, clinical practitioners need systems that monitor patient health and subsequently allow for risk scoring. Existing approaches for risk scoring in patients with COVID-19 focus primarily on intensive care units (ICUs) with specialized medical measurement devices but not on hospital general wards.

OBJECTIVE

In this paper, we aim to develop a risk score for inpatients with COVID-19 in general wards based on consumer-grade wearables (smartwatches).

METHODS

Patients wore consumer-grade wearables to record physiological measurements, such as the heart rate (HR), heart rate variability (HRV), and respiration frequency (RF). Based on Bayesian survival analysis, we validated the association between these measurements and patient outcomes (ie, discharge or ICU admission). To build our risk score, we generated a low-dimensional representation of the physiological features. Subsequently, a pooled ordinal regression with time-dependent covariates inferred the probability of either hospital discharge or ICU admission. We evaluated the predictive performance of our developed system for risk scoring in a single-center, prospective study based on 40 inpatients with COVID-19 in a general ward of a tertiary referral center in Switzerland.

RESULTS

First, Bayesian survival analysis showed that physiological measurements from consumer-grade wearables are significantly associated with patient outcomes (ie, discharge or ICU admission). Second, our risk score achieved a time-dependent area under the receiver operating characteristic curve (AUROC) of 0.73-0.90 based on leave-one-subject-out cross-validation.

CONCLUSIONS

Our results demonstrate the effectiveness of consumer-grade wearables for risk scoring in inpatients with COVID-19. Due to their low cost and ease of use, consumer-grade wearables could enable a scalable monitoring system.

CLINICALTRIAL

Clinicaltrials.gov NCT04357834; https://www.clinicaltrials.gov/ct2/show/NCT04357834
Development of Arduino Uno-Based TCS3200 Color Sensor and Its Application on the Determination of Rhodamine B Level in Syrup
Authors: Surbakti Muhammad Syukri , Farhan Muhammad , Zakaria Zakaria , Isa Muhammad , Sufriadi Elly , Alva Sagir , Yusibani Elin , Heliawati Leni , Iqhrammullah Muhammad , Suhud Khairi
Published: June 2022

The use of the notorious synthetic dye, rhodamine B, in food and beverage products has been widely reported. This application urges the need to develop an analytical method that can provide reliable rhodamine B data with an easy operational technique. Therefore, this research is aimed to develop an Arduino Uno-based TCS3200 color sensor and study its application to determine rhodamine B levels in syrup. The design of the analytical instrument included TCS3200, an Arduino Uno microcomputer, an Integrated Development Environment (IDE) software, a black box container, and a 24 × 2 matrix display screen, where samples were prepared via absorption using wool thread. With a linear range of 1–20 mg/L, our proposed colorimetric sensor had recoveries of 96.25–110.3%, which was better compared to that was obtained from the UV-vis (81.8–100.6%) method. The detection and quantification limits of the sensor were 2.766 and 8.383 mg/L, respectively. The syrup samples used in this study were purchased from the local stores in Banda Aceh. Based on the proposed TCS3200 color sensor, the highest rhodamine B concentration from the syrup sample was 16.74 mg/L. The t-test analysis in this study revealed that the Rhodamine B levels quantified using the newly developed TCS3200 color sensor were not statistically or significantly different from the UV-Vis spectrophotometer method.
Synthesis and Cytotoxic Test of Halogen-Substituted Chalcone Against MCF-7 Breast Cancer Cells
Authors: Brahmana Eti Meirina , Kaban Jamaran , Haro Ginda , Ginting Mimpin
Published: June 2022

A series of chalcones was synthesized to be (E)-1-(4-chlorophenyl)-3-p-tolyprop-2-en-1-on (1), (E)-1-(4-chlorophenyl)-3-(4-tolyprophenyl) prop-2-en-1-on (2), (E)-1-(3-bromophenyl)-3-p-tolylprop-2-en-1-on (3), and (E)-1-(3-bromophenyl)-3-(4-isopropyl phenyl) prop-2-en-1-on (4) using irradiate microwave method with reaction time from 3, 6, and 8 min at 800 °C and 700 W. The compounds were characterized using TLC, UV-Vis, FTIR, 1H-NMR, and evaluated MCF-7 cancer cell cytotoxic test with Presto BlueTM. All compounds produced were in the form of yellow crystals. The results showed that compounds 2, 3, and 4 were potentially a Como prevention agent and inhibit cell proliferation with IC50 values of 37.24, 422.22, and 22.41 ppm, respectively. While compound 1 had IC50 1,484.75 and no cytotoxic effect. Further tests should be carried out for compounds 2, 3, and 4 against normal cells to measure the compound's safety for normal cells.
Performance of a Hybrid Catalyst from Amine Groups and Nickel Nanoparticles Immobilized on Lapindo Mud in Selective Production of Bio-hydrocarbons
Authors: Trisunaryanti Wega , Azizah Salma Nur , Fatmawati Dyah Ayu , Triyono Triyono , Ningrum Novia Cahya
Published: June 2022

In the present work, optimum conditions for hydrocracking of waste palm cooking oil (WPCO) over a Ni-NH2/Lapindo mud catalyst were studied to obtain a high quantity and quality of biofuel. The utilized catalyst support material was Lapindo mud (LM) from Sidoarjo, Indonesia, which was only given physical treatment (i.e., washing, drying, grinding, and calcining). Ni/LM was prepared via wet impregnation in three different Ni weight loadings: 1, 5, and 10 wt.%, which were denoted as Ni(A)/LM, Ni(B)/LM, and Ni(C)/LM, respectively. As a result, the hydrocracking test of WPCO under the temperature of 470 °C and a feed/catalyst weight ratio of 50 showed that the Ni(A)/LM catalyst produced the highest liquid product reaching 46.65 wt.% among the other Ni-based catalysts. The liquid product can be increased drastically to 63.93 wt.% under a more optimum temperature at 550 °C. Functionalization of Ni(A)/LM as the best catalyst was carried out by grafting method with NH2 groups from 3-APTMS, resulting in Ni(A)-NH2/LM. This modification increased the liquid product to 68.17 wt.% under hydrocracking conditions using a weight ratio of 75. Moreover, the reusability of Ni(A)-NH2/LM was found to be effective for three hydrocracking runs, constantly yielding an average biofuel of 80 wt.%.
CuO, MgO, and ZrO2 Loading on HZSM5 by Deposition-precipitation: Study of Crystallinity, Specific Surface Area, and Morphology
Authors: Arvianto Rizky Ibnufaatih , Budiman Anatta Wahyu , Nugrahaningtyas Khoirina Dwi
Published: June 2022

Bifunctional catalysts are often used in multiple reactions to synthesize certain products. The catalytic activity of bifunctional catalysts is influenced by parameters such as crystallinity, specific surface area, metal distribution, and morphology. Bifunctional catalysts are manufactured by adding metal to the support. The metal loading to the support often affects these parameters. Therefore, this research was conducted to determine the effect of CuO, MgO, and ZrO2 addition to HZSM5 on these parameters. The often-used loading method was deposition precipitation. The pH of the metal-support precursors' solution was increased to basic (pH of 8) to deposit the metal on the support. The loading effect was investigated by producing the following materials: CuO/HZSM5, CuO/ZrO2/HZSM5, CuO/MgO/HZSM5, and CuO/MgO/ZrO2/HZSM5. Each material was characterized using XRD, SAA, SEM, Mapping, EDS, and XRF. The results showed that all metal oxides could be embedded in the HZSM5. The loading of CuO, MgO, and ZrO2 to HZSM5 did not affect the crystallinity (structure) and morphology, increased the specific surface area, and was evenly distributed inside the pore of HZSM5. Further research is needed to determine the effect of crystallinity, specific surface area, and morphology on other metals and support types.
KASUS SCALY FACE PADA KAKATUA PUTIH (Cacatua alba) DI TAMAN KONSERVASI MADIUN UMBUL SQUARE
Authors: Endah Anggraeni Henny , Sulistian Miftakhul , Aprilia Winantika
Published: June 2022

Scaly face is an infestation by burrowing mites Knemidocoptes pilae. It is frequently encountered in birds, where the mite affects featherless tracts, most commonly the beak, and eyelids. Losses due to ectoparasite infestation in birds was decreased appetite, hair loss, hyperkeratosis, alopecia, itching and death. The purpose of writing a case study is provides information about the management of the scaly face in the white parrot (Cacatua alba) in the Madiun Umbul Square Conservation Park. East Java, Indonesia, on 20 July - 20 August 2020. Observations were directly, by assisting in handling and treatment in isolation cages.  A white parrot weighs 600 grams, from Balai Konservasi Sumber Daya Alam (BKSDA) showed hair loss and keratosis around the eyes and. Handling bird placement in isolation cages, skin scraping examination, found Knemidocoptes pilae, treatment with 0.02 ml of 1% ivermectin and 0.1 ml of Vetadryl® subcutaneously 3 times on 30 July, 10 and 17 August 2020. The results of treatment show healing such as appetite increases, keratosis disappears, and fine hairs grow around the eyes.
Determinants of Emerging Capital Markets Development: A Case of Dar Es Salaam Stock Exchange
Authors: Suleiman Democracy , Mbogo Crispin John
Published: June 2022

This study aims to assess determinants of emerging capital markets development with particular reference to Dar es Salaam Stock Exchange (DSE). Specifically, the study aimed to analyze influence of legal and institutional framework, influence of political and macroeconomic stability and effects of broadening the investors’ base on capital markets development. The study employed time series research design. Data from statistical observations were recorded in a duration of 10 years (2011-202) on capital market development in relation to macroeconomic factors including liquidity in the stock market, investment, banking sector expansion and foreign direct investment. The regression findings correspondingly showed that the multiple determination coefficient R2 is 0.9272. The result showed that the exogenous variables (INTR, INFL, EXCHR, NINFA and LFW) are explained by 92.72% of the variations in dependent variable (CMD) while remaining 7.28 % are attributed to other factors not considered in the model are to blame. In addition, Durbin Watson (DW) statistics of 1 were disclosed in the results. The study recommends that small and medium businesses, which play a significant role in Tanzania's economy, should also be encouraged to engage in the stock market. A systematic and comprehensive investment promotion and facilitation plan that suits Tanzania's interests is required. Savings habit must be encouraged in the country by government policies that favour it. Also, as a country attracts foreign investment, more jobs become available, and individuals have more money to save. In addition, foreign direct investment adds management and technology transfer capabilities.
Implications of Impoliteness Strategies on Interpersonal Relations: An Analysis of The Dirty Picture
Authors: Yadav Dr. Jitendra Kumar
Published: June 2022

Impoliteness is an action or a linguistic expression contrary to politeness. It is a general impression that all the societies have devised certain norms of politeness to keep the conflict in conversation at bay and thereby keep the interactants in a good humour. Nevertheless, interactants sometimes either fail to observe politeness in interaction or intend to violate the said norms of politeness which results in impoliteness. The present paper makes an attempt to understand impoliteness from a linguist’s perspective and draw a line between politeness and impoliteness. It uses impoliteness framework proposed by Culpeper (1996) to understand the implications of impoliteness on interpersonal relation through the analysis of select exchanges taken from the film, The Dirty Picture. The analysis reveals that the interactants are sensitive to impoliteness and the frequent use of impoliteness strategies (accidental or deliberate) in interpersonal discourse causes conflict in relations. It is often used as a tool or strategy to exercise power, dominance, superiority or threat over the hearer, subject to the speaker’s intention, position, gender, goal and context, which play a vital role in the choice of impoliteness strategies, perception of meaning in day-to-day exchanges and in causing disharmony in relation between the parties at the negotiations of useful business.
Uso de la inteligencia artificial en la investigación para el reposicionamiento de fármacos
Authors: Olascoaga-Del Angel Kevin Samael , Konigsberg-Fainstein Mina , Pérez-Villanueva Jaime , López Díaz-Guerrero Norma Edith
Published: June 2022

El desarrollo de algoritmos para su utilización en la inteligencia artificial y la disponibilidad masiva de datos biomédicos han impulsado y acelerado la investigación, con el resultado de descubrimientos y de tratamientos novedosos utilizando fármacos patentados y aprobados para el tratamiento de diferentes enfermedades. Este proceso se conoce como reposicionamiento de fármacos (REFA), y puede ser abordado por una rama de la inteligencia artificial (IA) conocida como aprendizaje automático (AA). El aprendizaje automático se basa en un conjunto de algoritmos que, combinados con técnicas computacionales bien establecidas en el campo del descubrimiento de fármacos, han sido capaces de dar lugar, con una alta eficacia, a nuevas propiedades y relaciones farmacológicas anteriormente desconocidas. Así, se han identificado nuevos blancos y tratamientos potenciales contra diversos padecimientos como el cáncer, y las enfermedades neurodegenerativas e infecciosas, entre otras. El objetivo de este trabajo de revisión es contribuir a la literatura en español sobre el uso de la inteligencia artificial y el aprendizaje de máquina en la investigación para el reposicionamiento de fármacos.
Clasificación de enfermedades y condiciones periodontales y periimplantarias 2018. Primera parte
Authors: Vargas Casillas Ana Patricia , Yáñez Ocampo Beatriz Raquel
Published: June 2022

Las academias de periodontología se reúnen en determinados mo- mentos para revisar los avances científicos y, acorde con éstos, realizan cambios a la clasificación de las enfermedades y condicio- nes periodontales. La clasificación de enfermedades periodontales del año 1999 estuvo vigente durante 18 años, por lo que en 2017 se realizó un taller mundial copatrocinado por la Academia Americana de Periodontología (AAP) y la Federación Europea de Periodontolo-gía (EFP, por sus siglas en inglés), donde expertos periodontales de todo el mundo se reunieron para actualizar y presentar una nueva clasificación. Se dividieron en cuatro grupos de trabajo consistentes en: I. Salud periodontal, enfermedades y condiciones gingivales; II. Formas de periodontitis; III. Manifestaciones periodontales de las enfermedades sistémicas y condiciones del desarrollo y adquiridas; y IV. Enfermedades y condiciones periimplantarias. La nueva clasi- ficación publicada en 2018 presenta grandes cambios como: la de- finición de salud periodontal para su detección tanto en situaciones clínicas como con fines epidemiológicos, y la de periodonto intacto y reducido; la exclusión de la periodontitis crónica y agresiva, inclu- yéndolas en una sola periodontitis, determinada a través de la pér- dida de inserción y ósea, categorizada por estadios (I, II, III y IV) y grados de progresión (A, B, C); y la incorporación de enfermedades y condiciones periimplantarias. La nueva clasificación busca ser útil, práctica, flexible, con definiciones de casos y criterios de diagnósti- co para apoyar al clínico en el tratamiento de sus pacientes, y per- mitir a los clínicos e investigadores de cualquier área comunicarse con un lenguaje común. El objetivo del presente trabajo es presen- tar en dos partes las principales definiciones y parámetros de cada concepto de la nueva clasificación para el estudiante y dentista de la práctica general. En esta primera parte, se abordará la sección I (Salud periodontal, enfermedades y condiciones gingivales) y lasección II (Formas de periodontitis).
COVID-19 y úlceras orales: ¿un signo cada vez más frecuente?
Authors: Rocafuerte-Acurio Marco Antonio
Published: June 2022

Diversos estudios sugieren que los signos y síntomas más comunes de la infección por SARS-CoV-2 son dolor de cabeza, dolor de garganta, hiposmia, hipogeusia, diarrea, disnea y, en casos graves, neumonía. Sin embargo, uno de los aspectos escasamente documentados es la semiología a nivel de la cavidad oral. Esto podría ocurrir debido a que los odontólogos en diversas partes del mundo no quieren atender a pacientes infectados por SARS-CoV-2 por el alto riesgo de contagio a causa del íntimo contacto con la sali- va y las glándulas salivales mayores, en las cuales se encuentran grandes cantidades de receptores ECA-2 que van a facilitar la entrada del virus a la célula, y por ser una zona predilecta para la fijación de las proteínas de la espícula (spike) del coronavirus.
Disinfection of dental impression materials and its effects on dimensional changes: a literature review
Authors: Dapello-Zevallos Giannina Milagros , San Miguel-Ramírez Kimberly Nieves Mishell , Febre-Cuibin Kelvin Samuel , Gutiérrez-Obando Deysi Albertina , Tinedo-López Pedro Luis
Published: June 2022

A disinfectant must meet two fundamental requirements: be an effective antimicrobial agent and preserve the dimensional stability and surface details of the impression. This allows to obtain much more accurate plaster models that allow the fabrication of prostheses. The most recommended procedures are immersion and spraying, using disinfectant solutions such as sodium hypochlorite, glutaraldehyde, iodophors and phenols at different concentrations. The available impression materials were not originally formulated to disinfect, so there is the potential for disinfection procedures to alter the physical features of the impressions and consequently the characteristics of the plater model. That is why the aim of this updated review is to know the effect of disinfectants on the dimensional stability of different impression materials after being subjected to different disinfection methods.
Protocolo de los servicios de salud en una clínica dental durante la COVID-19
Authors: Valledor Alvarez Jorge Enrique , Diéguez Echevarría Yanlet , Viñas García Mileydis
Published: June 2022

En diciembre de 2019 se reportó en la ciudad de Wuhan, China la presencia de una neumonía atípica, a fines de enero la Organización Mundial de la Salud declararía el brote del nuevo coronavirus como emergencia nacional. Ante esta emergencia sanitaria, la práctica odontológica se ha visto en la necesidad de sufrir modificaciones en aras de adaptarse a la nueva normalidad. La dirección de atención médica de Cuba, desde el mismo comienzo, dictó una serie de medidas donde precisaba la organización de los servicios de salud bucal, que serían adoptadas en cada centro estomatológico. El objetivo del presente trabajo es describir las medidas adoptadas por la Clínica Estomatológica «51 y 86», así como el cumplimiento de las mismas frente a esta pandemia. Dicho protocolo se basó en la atención priorizada de las urgencias odontológicas, la capacitación del personal, su distribución en diferentes labores y el reforzamiento de las medidas de bioseguridad.
Advanced Power Transmission from Road to Electric Vehicle
Authors: Dhama Ankur , Dubey Avneesh , Kumar Dr. Neeraj
Published: June 2022

Abstract: With recent advancements in magnetic field simulation speed and capacity, as well as in power electronics, the area of wireless power transmission has grown considerably. Electric cars are being investigated as a possible substitute for internal combustion engine-powered vehicles in the future transport sector, particularly for CO2 reduction and alternative energy purposes. However, because to the vehicle's high weight, large capacity, and restricted driving range, many critical problems must be addressed. The article introduces the novel on-road dynamic wireless charging system for electric vehicles. Repowering technique for rechargeable vehicles is categorized as conductive or wireless, fixed or dynamic, and slow or rapid. In this paper, a concept in which an electric car is charged while in motion, without the need for a halt. Furthermore, a green and creative method to generate energy for the purpose of charging these cars is being proposed.
Study on the Various Properties of Rigid Pavement Concrete Using Different Types of Waste Materials
Authors: Choudhary Sandeep , Dewangan Nupoor
Published: June 2022

Abstract: A mixture of concrete and a water level of 0.35. Normally flowing concrete has little or no aggregate and has just enough cement to cover the coarse particles while maintaining the voids. In this paper the effects of aggression combined on concrete compression strength and PC stiffness, cubes were studied using experiments. The coarse aggregate shape used by the flaky is a penetrating effect but also reduces the power of the PC. cubes tossed using standard size, 20-10mm, 10-4.75mm green stones, pebbles and standard collections. It is well known that different types of mixing produce different levels of performance when applied to concrete mixes of given mixes and water / cement ratios. Flaky is a term used for flat and thin aggregates in terms of their width and height. Weak ratings will reduce the performance of the concrete mix and may affect long-term durability. Three compounds of PCs were prepared in different types of composites [stone, angular and stone]. The study concluded that the integrated type has a significant impact on PC properties. And finally review some of the exploratory methods currently being developed to find a continuous concrete and summarize the research methods under consideration.
A Review-on Experimental Investigation of the Effect of Pervious Concrete by Various Shape and Sizes of Aggregate
Authors: Choudhary Sandeep , Dewangan Nupoor
Published: June 2022

Abstract: A mixture of concrete and a water level of 0.35. Normally flowing concrete has little or no aggregate and has just enough cement to cover the coarse particles while maintaining the voids. In this paper the effects of aggression combined on concrete compression strength and PC stiffness, cubes were studied using experiments. The coarse aggregate shape used by the flaky is a penetrating effect but also reduces the power of the PC. cubes tossed using standard size, 20-10mm, 10-4.75mm green stones, pebbles and standard collections. It is well known that different types of mixing produce different levels of performance when applied to concrete mixes of given mixes and water / cement ratios. Flaky is a term used for flat and thin aggregates in terms of their width and height. Weak ratings will reduce the performance of the concrete mix and may affect long-term durability. Three compounds of PCs were prepared in different types of composites [stone, angular and stone]. The study concluded that the integrated type has a significant impact on PC properties. And finally review some of the exploratory methods currently being developed to find a continuous concrete and summarize the research methods under consideration. Keywords: No fines concrete, Pervious concrete, Pebbles, flaky and elongates aggregate.