bluuebunny/crossref_metadata_2025 huggingface dataset:
An Experimental Study on Water Permeability of Architectural Mortar Using Waste Glass as Fine Aggregate
Authors: Jing Guoqing , Huang Gang , Zhu Wenjun
Published: March 2020

This paper investigates the water permeability, consistency and density of architectural mortar with various contents of glass sand as fine aggregate. To reduce the effect of alkali-silica-reaction (ASR), metakaolin (MK) was used as supplementary cementitious material (SCM) instead of a component of white cement. The microstructure of glass sand mortar was visualized by means of scanning electron microscope (SEM) images. The experimental results showed that the permeability of the mortar increased with the glass sand, reaching its maximum at about 60–80% glass sand content. The optimum MK content varied with the content of glass sand, and higher content of MK was required for 60% glass sand. In addition, the consistency and density of mortar had a negative correlation with the increase of glass sand.
Control of Peri-Implant Mucous Inflammation by Using Chlorhexidine or Ultraviolet C Radiation for Cleaning Healing Abutments. Double-Blind Randomized Clinical Trial
Authors: Sanchez-Perez Arturo , Nicolas-Silvente Ana I. , Sanchez-Matas Carmen , Cascales-Pina Elena , Macia-Manresa Vanesa , Romanos Georgios E.
Published: March 2020

Two-phase implants must be exposed to the external environment after the period of osteointegration has elapsed. For this purpose, a healing abutment is placed passing through the mucosa while forming the emergence profile. The continuous connection and disconnection can lead to an alteration in the tissue maturation, both because of the contact of bacterial plaque and because of the mechanical trauma that involves its manipulation, manifesting with different degrees of erythema or bleeding. To assess whether this epithelium disruption can be counteracted, a blinded study design was developed on 150 unitary implant patients divided into three groups (n = 50), applying chlorhexidine (group 1), ultraviolet C (UV-C) at a wavelength of 254 nm (group 2)and no treatment as a control group (group 3), during each of the disconnections and connections during the prosthodontic treatment (1 time per week for four weeks). All groups showed a better epithelium aspect at the end of the evaluation. Although there were no statistically significant differences in the degree of inflammation, the UV-C treated group had the lowest plaque accumulation, and the highest was for the chlorhexidine-treated group.
Stiffness Identification of Foamed Asphalt Mixtures with Cement, Evaluated in Laboratory and In Situ in Road Pavements
Authors: Skotnicki Lukasz , Kuźniewski Jarosław , Szydlo Antoni
Published: March 2020

The article presents the possibilities of using foamed asphalt in the recycling process to produce the base layer of road pavement constructions in Polish conditions. Foamed asphalt was combined with reclaimed asphalt pavement (RAP) and hydraulic binder (cement). Foamed asphalt mixtures with cement (FAC) were made, based on these ingredients. To reduce stiffness and cracking in the base layer, foamed asphalt (FA) was additionally used in the analyzed mixes containing cement. The laboratory analyzes allowed to estimate the stiffness and fatigue durability of the conglomerate. In the experimental section, measurements of deflections are made, modules of pavement layers are calculated, and their fatigue durability is determined. As a result of the research, new fatigue criteria for FAC mixtures and correlation factors of stiffness modules and fatigue durability in situ with the results of laboratory tests are developed. It is anticipated that FAC recycling technology will provide durable and safe road pavements.
The Impact of Implant–Abutment Connection on Clinical Outcomes and Microbial Colonization: A Narrative Review
Authors: Lauritano Dorina , Moreo Giulia , Lucchese Alberta , Viganoni Chiara , Limongelli Luisa , Carinci Francesco
Published: March 2020

Introduction: Osseointegration are often suffering from oral conditions, especially, the micro gap at the implant–abutment connection represents a site for bacterial plaque aggregation, leading to increased inflammatory cells and causing peri-implantitis. Aim: The aim of this narrative review was to describe the different kinds of implant–abutment connections and their ability to reduce bacterial leakage and thus prevent peri-implantitis. Materials and methods: The following databases were consulted: Pubmed, Scopus, Cochrane Library, and Research gate and a total of 528 articles were found. After reading the abstract and titles, 473 items were excluded. The remaining articles (n = 55) were assessed for full-text eligibility. Thirty-three studies were included in the review. Results and Conclusions: We selected 22 clinical trials and 11 reviews, examining a total sample of 2110 implants. From the review, it was clear that there exists a relationship between the implant–abutment interface and bacterial leakage. All the connections presented an amount of micro-gap and bacterial micro-leakage, though conical and mixed connection systems seemed to behave better. Moreover, both connections seemed to have a better load distribution and the mixed system also had anti-rotational properties which are very useful during the positioning of the prosthesis.
Three-dimensional Magnetic Induction Tomography: Improved Performance for the Center Regions inside a Low Conductive and Voluminous Body
Authors: Klein Martin , Erni Daniel , Rueter Dirk
Published: March 2020

Magnetic induction tomography (MIT) is a contactless technique that is used to image the distribution of passive electromagnetic properties inside a voluminous body. However, the central area sensitivity (CAS) of this method is critically weak and blurred for a low conductive volume. This article analyzes this challenging issue, which inhibits even faint imaging of the central interior region of a body, and it suggests a remedy. The problem is expounded via two-dimensional (2D) and three-dimensional (3D) eddy current simulations with different transmitter geometries. On this basis, it is shown that a spatially undulating exciter coil can significantly improve the CAS by >20 dB. Consequently, the central region inside a low conductive voluminous object becomes clearly detectable above the noise floor, a fact which is also confirmed by practical measurements. The improved sensitivity map of the new arrangement is compared with maps of more typical circular MIT geometries. In conclusion, 3D MIT reconstructions are presented, and for the same incidence of noise, their performance is much better with the suggested improvement than that with a circular setup.
Blind Quality Assessment of Iris Images Acquired in Visible Light for Biometric Recognition
Authors: Jenadeleh Mohsen , Pedersen Marius , Saupe Dietmar
Published: March 2020

Image quality is a key issue affecting the performance of biometric systems. Ensuring the quality of iris images acquired in unconstrained imaging conditions in visible light poses many challenges to iris recognition systems. Poor-quality iris images increase the false rejection rate and decrease the performance of the systems by quality filtering. Methods that can accurately predict iris image quality can improve the efficiency of quality-control protocols in iris recognition systems. We propose a fast blind/no-reference metric for predicting iris image quality. The proposed metric is based on statistical features of the sign and the magnitude of local image intensities. The experiments, conducted with a reference iris recognition system and three datasets of iris images acquired in visible light, showed that the quality of iris images strongly affects the recognition performance and is highly correlated with the iris matching scores. Rejecting poor-quality iris images improved the performance of the iris recognition system. In addition, we analyzed the effect of iris image quality on the accuracy of the iris segmentation module in the iris recognition system.
Movement Detection in Soft Robotic Gripper Using Sinusoidally Embedded Fiber Optic Sensor
Authors: Yang Mei , Liu Qidi , Naqawe Hamza Sayed , Fok Mable P.
Published: March 2020

Soft robotics is an emerging field, since it offers distinct opportunities in areas where conventional rigid robots are not a feasible solution. However, due to the complex motions of soft robots and the stretchable nature of soft building materials, conventional electronic and fiber optic sensors cannot be used in soft robots, thus, hindering the soft robots’ ability to sense and respond to their surroundings. Fiber Bragg grating (FBG)-based sensors are very popular among various fiber optic sensors, but their stiff nature makes it challenging to be used in soft robotics. In this study, a soft robotic gripper with a sinusoidally embedded stretchable FBG-based fiber optic sensor is demonstrated. Unlike a straight FBG embedding configuration, this unique sinusoidal configuration prevents sensor dislocation, supports stretchability and improves sensitivity by seven times when compared to a straight configuration. Furthermore, the sinusoidally embedded FBG facilitates the detection of various movements and events occurring at the soft robotic gripper, such as (de)actuation, object holding and external perturbation. The combination of a soft robot and stretchable fiber optic sensor is a novel approach to enable a soft robot to sense and response to its surroundings, as well as to provide its operation status to the controller.
Performance Assessment of Low-Cost Thermal Cameras for Medical Applications
Authors: Villa Enrique , Arteaga-Marrero Natalia , Ruiz-Alzola Juan
Published: March 2020

Thermal imaging is a promising technology in the medical field. Recent developments in low-cost infrared (IR) sensors, compatible with smartphones, provide competitive advantages for home-monitoring applications. However, these sensors present reduced capabilities compared to more expensive high-end devices. In this work, the characterization of thermal cameras is described and carried out. This characterization includes non-uniformity (NU) effects and correction as well as the thermal cameras’ dependence on room temperature, noise-equivalent temperature difference (NETD), and response curve stability with temperature. Results show that low-cost thermal cameras offer good performance, especially when used in temperature-controlled environments, providing evidence of the suitability of such sensors for medical applications, particularly in the assessment of diabetic foot ulcers on which we focused this study.
Enhancing Compression Level for More Efficient Compressed Sensing and Other Lessons from NMR Spectroscopy
Authors: Gołowicz Dariusz , Kasprzak Paweł , Kazimierczuk Krzysztof
Published: March 2020

Modern nuclear magnetic resonance spectroscopy (NMR) is based on two- and higher-dimensional experiments that allow the solving of molecular structures, i.e., determine the relative positions of single atoms very precisely. However, rich chemical information comes at the price of long data acquisition times (up to several days). This problem can be alleviated by compressed sensing (CS)—a method that revolutionized many fields of technology. It is known that CS performs the most efficiently when measured objects feature a high level of compressibility, which in the case of NMR signal means that its frequency domain representation (spectrum) has a low number of significant points. However, many NMR spectroscopists are not aware of the fact that various well-known signal acquisition procedures enhance compressibility and thus should be used prior to CS reconstruction. In this study, we discuss such procedures and show to what extent they are complementary to CS approaches. We believe that the survey will be useful not only for NMR spectroscopists but also to inspire the broader signal processing community.
A Copper (II) Ensemble-Based Fluorescence Chemosensor and Its Application in the ‘Naked–Eye’ Detection of Biothiols in Human Urine
Authors: Wang Yue , Feng Huan , Li Haibo , Yang Xinyi , Jia Hongmin , Kang Wenjun , Meng Qingtao , Zhang Zhiqiang , Zhang Run
Published: March 2020

Quick and effective detection of biothiols in biological fluids has gained increasing attention due to its vital biological functions. In this paper, a novel reversible fluorescence chemosensor (L-Cu2+) based on a benzocoumarin-Cu2+ ensemble has been developed for the detection of biothiols (Cys, Hcy and GSH) in human urine. The chemosensing ensemble (L-Cu2+) contains a 2:1 stoichiometry structure between fluorescent ligand L and paramagnetic Cu2+. L was found to exclusively bond with Cu2+ ions accompanied with a dramatic fluorescence quenching maximum at 443 nm and an increase of an absorbance band centered at 378 nm. Then, the in situ generated fluorescence sluggish ensemble, L-Cu2+, was successfully used as a chemosensor for the detection of biothiols with a fluorescence “OFF-ON” response modality. Upon the addition of biothiols, the decomplexation of L-Cu2+ led to the liberation of the fluorescent ligand, L, resulting in the recovery of fluorescence and absorbance spectra. Studies revealed that L-Cu2+ possesses simple synthesis, excellent stability, high sensitivity, reliability at a broad pH range and desired renewability (at least 5 times). The practical application of L-Cu2+ was then demonstrated by the detection of biothiols in human urine sample.
Assistance Robotics and Biosensors 2019
Authors: Úbeda Andrés , Torres Fernando , Puente Santiago T.
Published: March 2020

This Special Issue is focused on breakthrough developments in the field of assistive and rehabilitation robotics. The selected contributions include current scientific progress from biomedical signal processing and cover applications to myoelectric prostheses, lower-limb and upper-limb exoskeletons and assistive robotics.
The Algorithm and Structure for Digital Normalized Cross-Correlation by Using First-Order Moment
Authors: Pan Chao , Lv Zhicheng , Hua Xia , Li Hongyan
Published: March 2020

Normalized cross-correlation is an important mathematical tool in digital signal processing. This paper presents a new algorithm and its systolic structure for digital normalized cross-correlation, based on the statistical characteristic of inner-product. We first introduce a relationship between the inner-product in cross-correlation and a first-order moment. Then digital normalized cross-correlation is transformed into a new calculation formula that mainly includes a first-order moment. Finally, by using a fast algorithm for first-order moment, we can compute the first-order moment in this new formula rapidly, and thus develop a fast algorithm for normalized cross-correlation, which contributes to that arbitrary-length digital normalized cross-correlation being performed by a simple procedure and less multiplications. Furthermore, as the algorithm for the first-order moment can be implemented by systolic structure, we design a systolic array for normalized cross-correlation with a seldom multiplier, in order for its fast hardware implementation. The proposed algorithm and systolic array are also improved for reducing their addition complexity. The comparisons with some algorithms and structures have shown the performance of the proposed method.
A Lightweight Key Agreement Protocol Based on Chinese Remainder Theorem and ECDH for Smart Homes
Authors: Jiang Yi , Shen Yong , Zhu Qingyi
Published: March 2020

Security and efficiency are the two main challenges for designing a smart home system. In this paper, by incorporating Chinese remainder theorem (CRT) into the elliptic curve Diffie–Hellman (ECDH), a lightweight key agreement protocol for smart home systems is constructed. Firstly, one-way hash authentication is used to identify the sensor nodes instead of mutual authentication to reduce the authentication cost. Secondly, the CRT is introduced to enhance the security of the original ECDH key agreement. Security analysis showed that the proposed protocol can validate the data integrity and resist the replay attack, the man-in-middle attack, and other attacks. Performance analysis and experiments showed that the protocol achieves high security with low communication and computation costs, and can be implemented in smart home systems.
Methods for Detection of Bioimpedance Variations in Resource Constrained Environments
Authors: Priidel Eiko , Annus Paul , Krivošei Andrei , Rist Marek , Land Raul , Min Mart , Märtens Olev
Published: March 2020

Changes in a certain parameter are often a few magnitudes smaller than the base value of the parameter, specifying significant requirements for the dynamic range and noise levels of the measurement system. In case of electrical bioimpedance acquisition, the variations can be 1000 times smaller than the entire measured value. Synchronous or lock-in measurement of these variations is discussed in the current paper, and novel measurement solutions are presented. Proposed methods are simple and robust when compared to other applicable solutions. A common feature shared by all members of the group of the proposed solutions is differentiation. It is achieved by calculating the differences between synchronously acquired consecutive samples, with lock-in integration and analog differentiation. All these methods enable inherent separation of variations from the static component of the signal. The variable component of the bioimpedance can, thus, be acquired using the full available dynamic range of the apparatus for its detection. Additive disturbing signals and omnipresent wideband noise are considered and the method for their reduction is proposed.
Highly Sensitive Detection of Chemically Modified Thio-Organophosphates by an Enzymatic Biosensing Device: An Automated Robotic Approach
Authors: Cetrangolo Giovanni Paolo , Rusko Janis , Gori Carla , Carullo Paola , Manco Giuseppe , Chino Marco , Febbraio Ferdinando
Published: March 2020

Pesticides represent some of the most common man-made chemicals in the world. Despite their unquestionable utility in the agricultural field and in the prevention of pest infestation in public areas of cities, pesticides and their biotransformation products are toxic to the environment and hazardous to human health. Esterase-based biosensors represent a viable alternative to the expensive and time-consuming systems currently used for their detection. In this work, we used the esterase-2 from Alicyclobacillus acidocaldarius as bioreceptor for a biosensing device based on an automated robotic approach. Coupling the robotic system with a fluorescence inhibition assay, in only 30 s of enzymatic assay, we accomplished the detection limit of 10 pmol for 11 chemically oxidized thio-organophosphates in solution. In addition, we observed differences in the shape of the inhibition curves determined measuring the decrease of esterase-2 residual activity over time. These differences could be used for the characterization and identification of thio-organophosphate pesticides, leading to a pseudo fingerprinting for each of these compounds. This research represents a starting point to develop technologies for automated screening of toxic compounds in samples from industrial sectors, such as the food industry, and for environmental monitoring.
A Tri-Stable Piezoelectric Vibration Energy Harvester for Composite Shape Beam: Nonlinear Modeling and Analysis
Authors: Zhang Xuhui , Zuo Meng , Yang Wenjuan , Wan Xiang
Published: March 2020

To reveal the nonlinear mechanism of the tri-stable piezoelectric vibration energy harvester based on composite shape beam (TPEH-C) and its influence on the system response, the nonlinear restoring force and the nonlinear magnetic force are discussed and analyzed in this paper. The nonlinear magnetic model is acquired by using equivalent magnetizing current theory, and the nonlinear resilience model is obtained by fitting experimental data. The corresponding distributed parameter model based on generalized Hamiltonian variation principle has been established. Frequency response functions for the TPEH-C are derived according to harmonic balance expansion, and the influence of different magnet distances and different excitation accelerations on the response amplitude and bandwidth of the TPEH-C are investigated. More importantly, the correctness of the theoretical analysis is verified by experiments. The results reveal that the spectrum of composite beam shows hard characteristic and the depth of potential well is changed, which provides a new way to ameliorate the potential well of the TPEH-C. A suitable magnet distance enables the TPEH-C to improve the response amplitude and the effective frequency range. The results in this paper have a theoretical guiding significance for the optimal design and engineering application of the TPEH-C.
Data Analytics and Applications of the Wearable Sensors in Healthcare: An Overview
Authors: Uddin Mohy , Syed-Abdul Shabbir
Published: March 2020

Improving health and lives of people is undoubtedly one of the prime goals of healthcare organizations, policy-makers, and leaders around the world [...]
Finding Characteristics of Users in Sensory Information: From Activities to Personality Traits
Authors: Lee Jaeryoung , Bastos Nicholas
Published: March 2020

The main objective of this work was to use information provided by a sensor-based activity recognition system to create a profile comprising user habits and link this information to the personality traits of users. User habits are represented by the sequence and duration of often observed daily life activities. Based on this information, we represented the user trials (sequence of activities) following a numerical method using Fourier series. The duration and sequence of the activities changed the phase and amplitude of the harmonics present in the Fourier representation. Each trial represented in this manner is called a behavioral spectrum. These data and the scores obtained from personality questionnaires were clustered separately and then an association was created between the clusters. The objective was to associate the activity-related features (sensor-based) and personality traits. The experimental results showed that for both young and elderly subjects, there is an association between the user personality traits and the manner in which they perform their activities. Moreover, the results obtained in this work show a promising method of assessing the personality traits of users based on their activities.
Methyl 4-Hydroxy-2,2-Dioxo-1H-2λ6,1-Benzothiazine-3-Carboxylate and Its Analogs Modified in the Benzene Moiety of the Molecule as New Analgesics
Authors: Ukrainets Igor V. , Petrushova Lidiya A. , Shishkina Svitlana V. , Sidorenko Lyudmila V. , Alekseeva Tatiana V. , Torianyk Inna I. , Davidenko Alexandra A.
Published: March 2020

In order to identify new regularities of the “structure–analgesic activity” relationship in the series of 2,1-benzothiazine derivatives, the synthesis of methyl 4-hydroxy-2,2-dioxo-1H-2λ6,1-benzothiazine-3-carboxylate and a group of its analogs substituted in the benzene moiety of the molecule, as well as their mono-and diammonium salts, was performed with tris(hydroxymethyl)aminomethane. The algorithm was proposed; it allows for uniquely solving the question of the nature of the substituent and its true position in the benzothiazine core based on the complex use of NMR (1H and 13C) and mass spectrometry data. Using single-crystal X-ray diffraction analysis it was proven that salt formation first passes through the cyclic sulfamide group and only then through the 4-hydroxyl group, and is always accompanied by a significant conformational rearrangement of the molecule. Based on the results of pharmacological tests it was found that modification of the benzene moiety of the molecule can be used as a method for enhancing the analgesic properties of the class of compounds studied. The presence of a substitute in position 7 is particularly effective, regardless of its nature. A comparative analysis of the analgesic activity of the initial esters and their mono- and diammonium salts convincingly showed that the common belief about a direct relationship between the solubility of a substance and the level of its biological effect is not always true. As it turned out, increasing the solubility in water can lead to a variety of consequences: From a significant increase in analgesia to its complete elimination. It was suggested that the analgesic activity of the compounds studied is determined not by solubility, but by the molecular conformations formed during their obtainment.
Environmental Performance Evaluation and Analysis Using ISO 14031 Guidelines in Construction Sector Industries
Authors: Falqi Ibrahim , Alsulamy Saleh , Mansour Mohamed
Published: March 2020

The construction sector is garnering increasing concern as an industry that generates significant pollution while suffering from a lack of adequate environmental performance evaluations. The purpose of this study is to evaluate the environmental performance of construction sector industries using the ISO 14031 standard in three dimensions: planning, using data and information, and reviewing and improving environmental performance evaluations. Using a descriptive and correlational approach, this study described and analyzed the level of implementation using a 7-point Likert scale questionnaire distributed to 1000 organizations in Saudi Arabia. The questionnaires were completed between May and December of 2018 and the results were measured against similar studies. The mean positive percentage responses were 31.36 and expressed the implementation levels of the three dimensions of environmental performance. The corresponding values for the three dimensions’ items were 33.36, 29.83, and 30.95 respectively. The minimum Kendall correlation coefficients for each item in a dimension were 0.79, 0.79, and 0.83, respectively. The maximum correlation values between an item and a dimension to which the item did not belong were 0.25. This study answers a fundamental question regarding the implementation level values of environmental performance in construction organizations based on the ISO 14031 standard model and analyzes the pairwise correlation among the descriptor variables of the model. Further studies are needed to investigate the model structure using the principle component, factor analysis, and cluster analysis.
Assessing the Sustainability Implications of Autonomous Vehicles: Recommendations for Research Community Practice
Authors: Williams Eric , Das Vivekananda , Fisher Andrew
Published: March 2020

Autonomous vehicles (AV) are poised to induce disruptive changes, with significant implications for the economy, the environment, and society. This article reviews prior research on AVs and society, and articulates future needs. Research to assess future societal change induced by AVs has grown dramatically in recent years. The critical challenge in assessing the societal implications of AVs is forecasting how consumers and businesses will use them. Researchers are predicting the future use of AVs by consumers through stated preference surveys, finding analogs in current behaviors, utility optimization models, and/or staging empirical “AV-equivalent” experiments. While progress is being made, it is important to recognize that potential behavioral change induced by AVs is massive in scope and that forecasts are difficult to validate. For example, AVs could result in many consumers abandoning private vehicles for ride-share services, vastly increased travel by minors, the elderly and other groups unable to drive, and/or increased recreation and commute miles driven due to increased utility of in-vehicle time. We argue that significantly increased efforts are needed from the AVs and society research community to ensure 1) the important behavioral changes are analyzed and 2) models are explicitly evaluated to characterize and reduce uncertainty.
-.El mundo está alerta a epidemia por neumonías causadas por coronavirus relacionado al consumo de animales silvestres: La historia se repite.
Authors: Conejeros Flores Cesar XesaR
Published: March 2020

El mundo está en alerta epidémica debido a la neumonía relacionada con el coronavirus causada por el consumo de animales salvajes: la historia se repite.
Crkva i povlašteno mjesto siromašnih u Božjem narodu
Authors: Domazet Anđelko
Published: March 2020

Evanđeosko načelo siromaštva ima nezaobilaznu ulogu s obzirom na život i
poslanje Crkve u suvremenom svijetu. Kako bi vjerodostojno svjedočila Isusovu poruku o čovjekoljubivome, milosrdnom i pravednom Bogu, ona je pozvana prakticirati duh siromaštva i biti Crkva siromašnih i obespravljenih. U prvom dijelu rada želimo produbiti biblijsku i kristološku dimenziju shvaćanja siromaštva. Stoga analiziramo evanđeosko
siromaštvo iz perspektive Isusova navještaja kraljevstva Božjega i prakse prve Crkve. U drugome dijelu, u svjetlu koncilske vizije Crkve i katoličkoga socijalnog nauka, nastojimo istaknuti strukturalni značaj ‘opcije za siromašne’ u poslanju Crkve. Solidarnost sa siromasima i socijalno ugroženima, sa svima onima koji su na bilo koji način obespravljeni u doba globalizacije i neoliberalnog kapitalizma, društvena je i duhovna vrijednost temeljnih postavki kršćanskog svjedočenja u ovom svijetu.
RUBÍ, NUEVA VARIEDAD MEXICANA DE NOCHEBUENA ROJA PARA INTERIOR
Authors: Canul-Ku Jaime , García-Pérez Faustino , Barrios-Gómez Edwin J. , Osuna-Canizalez Felipe de J. , Rangel-Estrada Sandra E. , Ramírez-Rojas Sergio G.
Published: March 2020

La nochebuena (Euphorbia pulcherrima Willd. ex Klotzsch) es la planta en contenedor de mayor venta en el mundo durante los meses de noviembre y diciembre (Trejo et al., 2012). Se le considera el símbolo de la navidad. En México se comercializan anualmente 25 millones de plantas, de las cuales seis millones se producen en el estado de Morelos. Otras entidades productoras de nochebuena son el Edo. de México, Michoacán, Ciudad de México y Puebla. Las variedades disponibles en el mercado nacional se han producido en el extranjero lo que implica costos altos de adquisición de esquejes (material de propagación), además de problemas como el lento crecimiento de la planta y, en ocasiones, mala adaptación a los ambientes de producción, lo que desfasa la pigmentación de brácteas.
Ara hexagonal del Teatro de Itálica
Authors: Fernández Martínez Concepción , López Sánchez Yolanda
Published: March 2020

Modelo 3d, que permite su visionado como realidad virtual y aumentada, del ara hexagonal del Teatro de Itálica, expuesta en el Museo Arqueológico de Sevilla (nº inv. 90-1214), que incluye descripción y anotaciones sobre especificidades del soporte y sobre todo del texto en él grabado.Escaneada a partir de la pieza original ubicada en el Museo Arqueológico de Sevilla , y en origen procedente del Teatro de Itálica. Tras digitalizarse la pieza, ha sido tratada en postprodución, modificando su retopología y mapeado con gran calidad de realismo. Escáneres utilizados : Artec Eva y Artec Spider. Postproducción realizada con los softwares : ARTEC STUDIO, Instant Meshes y BLENDER. El proyecto también comprueba que el uso del modelo 3D en formato .STL es fiel a la realidad para la obtencion de mediciones sin necesidad de acudir a la pieza original.
La figura ha sido subida a la plataforma SKETCHFAB para ser usada por los alumnos usando un móvil, un PC o una tablet. Puede ser movida, rotada, ampliada e iluminada, para ser encuadrada en infinitas posiciones.
El Recurso puede experimentarse directamente con el navegador en modo 360º, tanto en equipos de escritorio como con dispositivos móviles. No obstante, es altamente recomendable una mejor experiencia inmersiva, la cual puede obtenerse ayudándose de un dispositivo de gafas de Realidad Virtual ( Oculus, HTC Vive, Daydream o Cardboard ) con las que pueda conectarse mediante Mozilla Firefox o mediante la app de Sketchfab. La experiencia de Realidad Aumentada requiere de un dispositivo móvil que soporte ARCore.
Challenges for Not Attaining the Millennium Development Goals (MDGS) Through Physical and Health Education and Strategies for Improvement
Authors: Ananomo Leonard E. , Emeka Akpu Emmanuel
Published: March 2020

The study examined the perception of Physical and Health education teachers on the existing challenges and identifying the strategies for ameliorating them. The study adopted a survey research design, and through purposive sampling, two hundred and eighty (280) physical and health education teachers were selected from five education zones out of the six existing education zones. A structured questionnaire on the 4-point rating scale was used for the study. The instrument was face validated and the mean reliability of the instrument was 0.83 using Cronbach alpha. The findings of the study revealed that the existing challenges include-inadequate physical and health education teachers, lack of training materials, equipment, facilities, and funding. Some identified strategies for alleviating the challenges include training of Physical and Health education teachers, provision of material, equipment and supplies, facilities and funding. Necessary recommendations were made.
Problems Affecting Development of Physical Education and Sports in Tertiary Institutions in Anambra State as Perceived by Lecturers and Coaches
Authors: Ananomo Leonard E.
Published: March 2020

This study investigated the problems affecting the development of physical education and sports in tertiary institutions in Anambra State as perceived by the lecturers. To achieve the aim of the study, three research hypotheses were formulated. The survey research design was adopted for the study. The population of the study was 675 physical education lecturers and coaches in all the tertiary institutions in Anambra State. The sample was drawn through a stratified and simple random sampling technique. The sample for the study consists of 205 Physical Education lecturers and coaches randomly drawn from the three institutions. An instrument titled "Problems Affecting Physical Education and Sports Development Questionnaire (PAPESDO)" was used to elicit information from the respondents. Out of 205 questionnaires administered on the respondents, only two hundred (200) were retrieved. The data obtained were analyzed using independent t-test and Pearson Product Moment Correlation Coefficient (r). The findings revealed that corruption, irregular electricity power supply, and inadequate facilities/equipment are some of the major problems affecting the development of physical education and sports in tertiary institutions in Anambra State. Based on the findings, it was recommended that corruption should be checked in our institutions, the power supply should be enhanced or alternative sources of power should be developed and adequate facilities should be made available to enhance the development of all-important education.
Principles and Practice of the Maintenance of Physical Education Curriculum Facilities and Equipment in Schools
Authors: Ananomo Leonard E.
Published: March 2020

The focus of this paper is to discuss an enhancing approach to the maintenance of physical education curriculum facilities and equipment in schools. In the course of doing this, the role of administrative policy, finance, information, process studies, proficiency and attitude measures, follow-up studies, programme improvement, making decisions about individuals; and administrative regulation were elucidated upon. The writer further explained the role and importance of Teacher’s Aptitude, Magnitude and Attitude (TAMA) and Teacher’s Aptitude Disposition and Attitude (TADA) on the outcome of physical education curriculum programme evaluation. He also emphasized the Analysis of Programme Performance (APP) as being more informative for the effective maintenance of physical education curriculum implementation facilities and equipment
Effects of Four-Day School Weeks on School Finance and Achievement: Evidence from Oklahoma
Authors: Morton Emily
Published: March 2020

Motivated by potential financial savings, four-day school weeks have proliferated across the United States in recent years, reaching public schools in 25 states as of 2018. The consequences of the four-day school week for students, schools, and communities are largely unknown. This paper uses district-level panel data from Oklahoma and a difference-in-differences research design to examine the causal effect of the four-day schedule on school district finance and academic achievement. Results indicate that four-day weeks decrease districts’ federal revenues and their non-instructional and support services expenditures. Decreases are concentrated specifically in operations and maintenance, food services, and transportation expenditures and amount to approximately 2.03% of the average four-day district’s budget. I find no detectable effect of the four-day week on academic achievement.
Statistical studies of personal brand income structure in professional golf
Authors: Andreev Alexey , Dudnik Elizaveta , Korolkov Aleksey
Published: March 2020

The aim of the study is to determine the income factor structure as well as the ratio and relationships between sport achievements, prize money payouts and total income of an athlete`s personal brand on the example of a famous American golfer Tiger Woods. Methods and organization of the study: we systematized the data on a professional career of T. Woods in 1996-2018. The data included annual income and its components, overall score and the position in the world ranking, the number of PGA tournaments, cuts made, wins in majors and PGA tournaments.
We used methods of descriptive statistics, correlative, spectral and factor analysis for data processing. Research results: based on the ratio analysis of other income and the prize money payouts, we revealed the success criterion of an athlete`s personal brand and the correlations between various sport and financial indicators appropriate to the modern system of achievement assessment in golf. We demonstrated a weak dependence of other income from performance on the golf course. We identified three factors determin- ing the change in personal brand income and explaining 53% of the total variance. The conclusion. There are quantitative statistical indicators characterizing the number of players, the number of participants and the number of players participating in tournaments. In a certain way, that other sports do not have access to sports achievements.
New approaches to the improvement of coordination skills of young basketball players aged 13-14
Authors: Gorodnichev Ruslan , Tatyana Obletsova
Published: March 2020

The aim of the research is to explore the perspective of the improvement of coordination skills of young bas- ketball players in the framework of the experimental training program providing the use of open competition, "balance ladder" and static core-muscles exercises.

Materials and methods of the research. The research brought together two groups of twelve basketball players aged 13-14 from youth basketball teams "Express" (experimental group from Velikie Luki) and "Youth" (con- trol group from Pskov). Length of training programs was 8 months. We used three groups of tests: physical fitness, "closed" tests and "open" tests.

Research results and discussion. After 8 months of training, participants of the experimental group showed higher results in physical fitness tests, "closed" and "open" tests, indicating a superior level of their coordina- tion skills, compared to the control group.

Conclusion. The experimental training program that we have designed and implemented provides the im- provement of coordination skills of young basketball players.
Standards for physical fitness of biathletes during the period of sport skills perfectionм
Authors: Mikhalev Vladimir , Reutskaya Elena , Pinyagin Pavel
Published: March 2020

The purpose – perfection of the techniques for controlling speed-strength capabilities and endurance of the rotator cuff muscles of biathletes during the period of sport skills perfection.

Research methods and organization. The study involved 204 biathletes aged 15-17. We tested the speed- strength abilities and endurance of rotator cuff muscles with the Skierg Concept2 ski ergometer (USA).

Research results. Significant changes in the endurance of rotator cuff muscles of biathletes occur in the age period from 15 to 16 years. The change in speed-strength abilities of female biathletes, in contrast to male biathletes, occurs against the background of an increase in the number of ski pole movements per minute. We processed the obtained data using the method of determining the boundaries of confidence intervals. Based on the data processed, we developed the standards for assessment of the speed-strength abilities and strength endurance of rotator cuff muscles of biathletes during the period of sport skills perfection with the Skierg Concept2 ski ergometer (USA). We tested applicability of the developed standards for speed-strength abilities and strength endurance of rotator cuff muscles in a one-year educational experiment.

Conclusion. We proposed a methodology for testing speed-strength abilities and strength endurance of rotator cuff muscles with the Skierg Concept2 ski ergometer (USA) in the framework of our study. The developed stand- ards for assessing speed-strength abilities and strength endurance of rotator cuff muscles of biathletes during the period of sport skills perfection help to identify strong and weak points of fitness and to predict the possibility of achieving certain results by individual parameters.
Analysis of psychophysiological characteristics in young basketballers trained by traditional and experimental programs
Authors: Obletsova Tatyana
Published: March 2020

The purpose of the study was to compare and analyze the psychophysiological characteristics of young bas- ketball players who trained according to both traditional program and experimental training program. The experimental training program provides motor actions realization in suddenly changing conditions.

Research methods and organization. The study involved 24 basketball players aged 13-14 years, with the expe- rience of sports activities from 5 to 6 years. The complex "NS-Psychotest" (2007, Ivanovo) was used to evalu- ate psychophysiological characteristics using the tests "Simple visual-motor reaction", "Reaction to a moving object" and "Complex visual-motor reaction".. Differences significance was established using one-way variance analysis (ANOVA) with Post-Hoc analysis using the Newman-Keuls criterion (STATISTICA 10 software pack- age).

Research results. Our training program aimed to coordination abilities improvement included open competi- tive basketball exercises, a set of body core static exercises and special exercises on the balance ladder. It was revealed that basketball players reaction stability decreasing after the end of training programs both in the experimental group (by 2.67%) and in the control group (by 1.08%) at p <0.05. At the same time most studied psychophysiological characteristics in the experimental group tended to increase, versus decreasing in the control group.

Conclusion. Thus, our experimental training program for young basketball players aimed to coordination abilities improvement has a positive effect to the athletes psychophysiological characteristics and it can be used for competitive results improving.
Assessment of speed-strength abilities of ski-racers in the training process
Authors: Reutskaya Elena , Pinyagin Pavel
Published: March 2020

The purpose – perfection of the technology for controlling the speed-strength abilities of ski-racers based on the data received with the Myotest PRO accelerometer (Switzerland).

Research methods and organization. The study involved 124 cross-country skiers at different stages of sport training. Assessment of the speed-strength abilities of lower extremity muscles of skiers was carried out using the Myotest PRO accelerometer (Switzerland).

Research results. The dynamics of changes in the speed-strength abilities of the lower extremity muscles indi- cates a decrease in the speed component of the power of skiers at the beginning of the sport excellence stage. Conclusion. The study revealed the informative character of the jumping tests based on the data received with the "Myotest PRO" accelerometer (Switzerland), which aimed at the exploration of speed-strength abilities of lower extremity muscles of skiers. Differentiated assessment of speed-strength components of the exercise intensity helps to assess strong and weak points of physical fitness of skiers and to adjust the training process.
EXTRACT MAXIMUM POWER FROM PV SYSTEM EMPLOYING MPPT WITH FLC CONTROLLER
Authors: A Chandramouli
Published: March 2020

Extract of maximum power from photo voltaic (PV) system employing with fuzzy logic controller (FLC) based MPPT technique is investigated in this article. Fuzzy is a expert supervisory control algorithm system, provides satisfied acceptable results from PV. Maximum/lower power point tracking (MPPT/LPPT) approaches are adopted to get maximum output power from the PV irrespective of variation in its input source (Solar irradiation and temperature). The performance results have been investigated in MATLAB/Simlink package for different conditions. From the simulation results it is evident that proposed fuzzy control algorithm works well compared to the other traditional MPPT techniques.
DESIGN OF INDUSTRIAL ROBOT FOR METAL DRILLING
Authors: A Dinesh kumar
Published: March 2020

The latest advancements in the programming techniques combined with the novel visionary and the motion technologies intensifying the possibility of the robotic applications. Nowadays the use of Robots in the industries mainly for the purpose of drilling, grinding and grating are very much increased. But due to the measurement variation’s along the different axes based on the physical and the mechanical properties of the material and the stiffness problems found in the Robots there prevails certain errors causing the modifications in the positioning. So the proposed process in the paper concentrates on the enhancing the stiffness of the robots and bring down the labors in the drilling process in order to have an optimized output at a reduced cost. The proposed design shows improvement in the accuracy and the efficiency of the robot working with the minimized rejection loss and the cost of the end product.
EFFICIENT SECURITY AND PRIVACY MECHANISM FOR BLOCK CHAIN APPLICATION
Authors: Shakya Subarna
Published: March 2020

The block chain has become one of the predominant term in the applications like financial, automobile, health care, risk management, and internet of things due to its reliability and more beneficial services. It executes every transaction by establishing trust in the open environment. The deployment of the block chain technology in the various applications remains as the recent research topic as the privacy and the security of the bock chain are undecided and unconvinced, so the paper tries to develop an efficient security and privacy mechanism for the block chain applications. The proposed method puts forth the biometric recognition in the block chain technology to improve the security and the privacy mechanism for the block chain application.
INTERNACIONALIZACIÓN EN LA EDUCACIÓN SUPERIOR; PROCESOS ADMINISTRATIVOS, ACADÉMICOS Y DE FORMACIÓN
Authors: Javier Rojas Jardel Alejandro
Published: March 2020

: La internacionalización de los procesos enseñanza-aprendizaje en las IES ha tomado relevancia creciente en los últimos años, lo que ha implicado un desafío administrativo, de gestión, curricular y metodológico para enfocar el desarrollo institucional hacia el ámbito internacional. En este contexto, el presente estudio comienza con una revisión bibliográfica del panorama mundial y regional sobre la internacionalización en las universidades en relación a su marco conceptual, características demográficas del proceso en américa latina, el caribe y Chile, analizando la implicancia de este en los planes estratégicos de las IES, especialmente en aspectos administrativos y de gestión académica, para luego proponer una línea de desarrollo por áreas que pretende integrar este proceso a nivel de pre y posgrado e investigación, relevando aspectos de formación continua, la formación de alumnos, interculturalidad y alianzas estratégicas.