bluuebunny/crossref_metadata_2025 huggingface dataset:
Perfectly-reflecting guided-mode-resonant photonic lattices possessing Mie modal memory
Authors: Ko Yeong Hwan , Razmjooei Nasrin , Hemmati Hafez , Magnusson Robert
Published: July 2021

Resonant periodic nanostructures provide perfect reflection across small or large spectral bandwidths depending on the choice of materials and design parameters. This effect has been known for decades, observed theoretically and experimentally via one-dimensional and two-dimensional structures commonly known as resonant gratings, metamaterials, and metasurfaces. The physical cause of this extraordinary phenomenon is guided-mode resonance mediated by lateral Bloch modes excited by evanescent diffraction orders in the subwavelength regime. In recent years, hundreds of papers have declared Fabry-Perot or Mie resonance to be the basis of the perfect reflection possessed by periodic metasurfaces. Treating a simple one-dimensional cylindrical-rod lattice, here we show clearly and unambiguously that Mie resonance does not cause perfect reflection. In fact, the spectral placement of the Bloch-mode-mediated zero-order reflectance is primarily controlled by the lattice period by way of its direct effect on the homogenized effective-medium refractive index of the lattice. In general, perfect reflection appears away from Mie resonance. However, when the lateral leaky-mode field profiles approach the isolated-particle Mie field profiles, the resonance locus tends towards the Mie resonance wavelength. The fact that the lattice fields “remember” the isolated particle fields is referred here as “Mie modal memory.” On erasure of the Mie memory by an index-matched sublayer, we show that perfect reflection survives with the resonance locus approaching the homogenized effective-medium waveguide locus. The results presented here will aid in clarifying the physical basis of general resonant photonic lattices.
Ridge resonators: impact of excitation beam and resonator losses
Authors: Schoenhardt Steffen , Boes Andreas , Nguyen Thach G. , Mitchell Arnan
Published: July 2021

Photonic resonators based on bound states in the continuum are attractive for sensing and telecommunication applications, as they have the potential to achieve ultra-high Q-factor resonators in a compact footprint. Recently, ridge resonators – leaky mode resonators based on a bound state in the continuum – have been demonstrated on a scalable photonic integrated circuit platform. However, high Q-factor ridge resonators have thus far not been achieved. In this contribution, we investigate the influence of excitation beam width and optical losses on the spectral response of ridge resonators. We show that for practical applications, the space required of the excitation beam is the limiting factor on the highest achievable Q-factor.
Steering Smith-Purcell radiation angle in a fixed frequency by the Fano-resonant metasurface
Authors: Fu Tao , Wang Daofan , Yang Ziqiang , Deng Zi-lan , Liu Wenxin
Published: July 2021

Smith-Purcell radiation (SPR) is a kind of electromagnetic wave radiation that happens when an energetic beam of electrons passes very closely parallel to the surface of a ruled optical diffraction grating. The frequency of radiation waves varies in the upper and lower space of the grating for different electron velocity, satisfying the SPR relationship. In this study, a Fano-resonant metasurface was proposed to steer the direction of the SPR waves at the fixed resonant frequency by changing the velocity of the electron beam without varying the geometric parameters or adding extra coupling structure. The maximum emission power always locates at the resonant frequency by utilizing the integration of the Poynting vector. The relative radiated efficiency can reach to a maximum value of 91% at the frequency of 441 GHz and the efficiency curve has a dip when the direction of SPR is nearly vertical due to the high transmission. There is a great consistence of steering radiation angle from 65 degrees to 107 degrees by altering the velocity of electron beam from 0.6c to 0.95c both in analytical calculation and PIC (particle-in-cell of CST) simulation at terahertz frequencies, where c is the speed of light in vacuum. Furthermore, the destructive interference of Fano resonance between the magnetic mode and the toroidal mode shows the underlying physics of steering SPR in a fixed frequency. Our study indicates that the proposed structure can produce direction-tunable THz radiation waves at resonant frequency by varying the velocity of the electron beam, which is promising for various applications in a compact, tunable, high power millimeter wave and THz wave radiation sources.
Surface-enhanced Raman scattering of trace Hg2+ on a 4-mercaptobenzoic acid-modified nanoporous Au substrate
Authors: Kong Xiangfa , Cheng Chaohui , Wang Qifan , Meng Mianwu , Chen Chaoshu , Wang Xiujian , Huang Siyu , Gan Weixin
Published: July 2021

A Au-Ga alloy layer is synthesized on a Au sheet substrate at low temperature and a new nanoporous Au material is then prepared based on Ga removal from the Au-Ga alloy by a electrochemical method. X-ray diffraction analysis confirms that the grains of the newly formed Au layer are refined and scanning electron microscopy suggests that the newly formed Au layer has a nanoporous structure with a pore size of∼16 nm. The cyclic voltammetry curve of the prepared nanoporous Au in a 1 M KCl solution presents a square structure of a supercapacitor with a specific capacitance of mF·cm-2, which is 86 times that of the smooth Au electrode. The 4-mercaptobenzoic acid (4-MBA) modified nanoporous Au material is used as a Raman substrate to detect Hg2+ with surface-enhanced Raman scattering. from 1.0×10−10 mol·L-1 to 1.0×10−5 mol·L-1), and the limit of detection is 1.0×10−10 mol·L-1.
Effects of medicinal plants mixture on growth performance, nutrient digestibility, blood profiles, and fecal microbiota in growing pigs
Authors: Oanh Nguyen Cong , Lam Truong Quang , Tien Nguyen Dinh , Hornick Jean-Luc , Ton Vu Dinh
Published: July 2021

Background and Aim: Alternative natural materials to antibiotics for improving digestive health and growth performance are needed due to strengthening regulations related to the use of antibiotic growth promoters. The study aimed to evaluate the effects of medicinal plants mixture (60% Bidens pilosa L., 15% Urena lobata L., 15% Pseuderanthemum palatiferum, 5% Ramulus cinnamomi, and 5% Star anise) as alternative growth promotors on animal health, nutrient digestibility, blood parameters, and growth performance of growing pigs.

Materials and Methods: The study was conducted, from April 2020 to June 2020, at a private pig production farm located in Cam Giang district Hai Duong Province, Vietnam. Forty-eight 10-week-old crossbred (♂Duroc×♀ [Landrace×Yorkshire]) pigs, average initial body weight 30.3±1.42 kg, were randomly allocated to four dietary groups, three replicate pens per experimental group, with 4 pigs/pen. For 7 weeks, the pigs were fed a basal diet supplemented with the mixture at levels of 0, 20, 40, and 60 g/kg of feed.

Results: Final body weight, average daily gain, average daily feed intake, and feed conversion ratio, as well as apparent total tract digestibility of dry matter, organic matter, crude protein, ether extract, and gross energy were not significantly influenced by the diets (p>0.05). Inclusion of the plant mixture decreased significantly red blood cell count, blood cholesterol, urea nitrogen, and low-density lipoprotein (LDL) concentrations (p<0.05) compared with the control diet. No diet effect was observed on fecal Escherichia coli, Salmonella spp., Clostridium spp., and total bacteria counts.

Conclusion: The incorporation of the plant mixture into the diet of growing pigs reduced serum cholesterol, LDL, and urea concentrations with no adverse effect on performance and nutrient digestibility.
Instrumentasi Neraca Air dalam Sistem Pengamat Hidrometeorologi Terpadu untuk Upaya Mewujudkan Ketahanan Air
Authors: Wijonarko Sensus
Published: July 2021

Telah dikembangkan Instrumentasi Neraca Air yang berupa sistem yang tujuan akhirnya dapat mengambil keputusan sendiri secara otomatis untuk memantau dan membantu mengelola perubahan aktual neraca air di kawasan yang dikelolanya sehingga ketahanan air setempat akan membaik. Instrumentasi ini perlu dilengkapi instrumen pengendali untuk menambah persediaan air bersih, mengurangi pemakaian air bersih, mengolah air bekas pakai, dan mengatur jenis air sesuai peruntukannya. Instrumentasi neraca air ini diharapkan dapat dihubungkan dengan sistem pemantau hidrometeorologi terpadu melalui instansi yang nantinya punya jalur menuju WIGOS dan/atau sistem-sistem lain sebagai bagian dari Decision Making Support System (DMSS) dalam bidang hidrometeorologi. Dengan interkoneksi yang seperti ini, instrumentasi neraca air ini dapat membantu meningkatkan jaminan ketahanan air di kawasan yang dikelolanya, untuk berbagai aplikasi sejak dari hulu sampai hilir.
Multivariate Analysis of Amazonian Rivers Located in an Area of Intense Industrial Activity, Barcarena, Pará State, Brazil
Authors: Lopes Iris Danielly da Silva , Medeiros Adaelson Campelo , de Melo Nuno Filipe Alves Correia , Lima Marcelo de Oliveira , Santos Maria de Lourdes Souza
Published: July 2021

In this study, were multivariate analysis of the waters of the Arienga and Murucupí rivers located near an area of intense industrial activity in the Barcarena City, Pará State, Brazil. Were analyzed the variables temperature, pH, total dissolved solids, electrical conductivity, DO, BOD, ammoniacal-N, nitrite-N, nitrate-N, phosphate, sulfate and total hardness in four sampling campaigns in the year 2011. This amazon rivers presented physicochemical characteristics well heterogeneous, but similar behaviors for the variables pH, temperature and DO in the extensions evaluated, that is, increase in the source-mouth direction, with variations from 4.77 to 7.33 and 5.51 to 7.3, 25 to 31°C and 27 to 32°C and from 4.4 to 7.98 mg.L-1 and 1.17 to 6.55 mg.L-1 for the Arienga and Murucupi rivers respectively. In addition to these characteristics, the Arienga River also presented an increase for ammoniacal-N, nitrite-N, nitrate-N and hardness in the dry period, with variations from 0.014 to 6.336 mg.L-1, 0.005 to 0.334 mg.L-1, 0.009 to 4.818 mg.L-1 and 1.146 to 14.389 mg.L-1 respectively. In general, Murucupí River presented different physicochemical characteristics that are coherent with the local scenario, where the launch domestic effluents and the environmental impacts caused by industrial waste are visible and recurrent respectively.
Jenuh Belajar: Strategi Orang Tua dalam Membersamai Anak Belajar di Masa Pandemi COVID-19
Authors: Fauziah Nurul , Nadlifah Nadlifah
Published: July 2021

The COVID-19 pandemic has changed the implementation of learning in early childhood. Monotonous learning is the focus of this research problem. The purpose of this study is to analyze how the strategies adopted by parents in dealing with children who are bored with learning during the COVID-19 pandemic and the factors that influence it. This type of research is descriptive qualitative research. The research location is in TK Masyithoh II Sanansari. The research subjects were principals, teachers, parents, and students. Collecting data using observation, interviews, and documentation. Data analysis was carried out using the Milles and Huberman model, namely data reduction, display data, and conclusion drawing/verification data. Test the validity of the data using source triangulation and technical triangulation. The results of the study showed that the learning saturation of Group B TK Masyithoh II Sanansari Kindergarten during the COVID-19 pandemic was because students did not have friends to exchange imagination and learning was monotonous. The strategies used by parents are: repeating orders, providing psychological support for children, and providing rewards. The supporting factors, namely: intrapersonal encouragement and encouragement from the family. While the inhibiting factors consist of: unstable child's mood, busy family, and the surrounding environment. The findings of this study have an educational impact on parents in accompanying children to learn during the COVID-19 pandemic and recommend parents to use this strategy as well as evaluation materials for early childhood educators.
Variable Anisotropic Hardy Spaces with Variable Exponents
Authors: Yang Zhenzhen , Yang Yajuan , Sun Jiawei , Li Baode
Published: July 2021

Let p(·) : ℝ
n
→ (0, ∞] be a variable exponent function satisfying the globally log-Hölder continuous and let Θ be a continuous multi-level ellipsoid cover of ℝ
n
introduced by Dekel et al. [12]. In this article, we introduce highly geometric Hardy spaces Hp

(·)(Θ) via the radial grand maximal function and then obtain its atomic decomposition, which generalizes that of Hardy spaces Hp
(Θ) on ℝ
n
with pointwise variable anisotropy of Dekel et al. [16] and variable anisotropic Hardy spaces of Liu et al. [24]. As an application, we establish the boundedness of variable anisotropic singular integral operators from Hp

(·)(Θ) to Lp

(·)(ℝ
n
) in general and from Hp

(·)(Θ) to itself under the moment condition, which generalizes the previous work of Bownik et al. [6] on Hp
(Θ).
Modelling of a two prey and one predator system with switching effect
Authors: Saha Sangeeta , Samanta Guruprasad
Published: July 2021

Prey switching strategy is adopted by a predator when they are provided with more than one prey and predator prefers to consume one prey over others. Though switching may occur due to various reasons such as scarcity of preferable prey or risk in hunting the abundant prey. In this work, we have proposed a prey-predator system with a particular type of switching functional response where a predator feeds on two types of prey but it switches from one prey to another when a particular prey population becomes lower. The ratio of consumption becomes significantly higher in the presence of prey switching for an increasing ratio of prey population which satisfies Murdoch’s condition [15]. The analysis reveals that two prey species can coexist as a stable state in absence of predator but a single prey-predator situation cannot be a steady state. Moreover, all the population can coexist only under certain restrictions. We get bistability for a certain range of predation rate for first prey population. Moreover, varying the mortality rate of the predator, an oscillating system can be obtained through Hopf bifurcation. Also, the predation rate for the first prey can turn a steady-state into an oscillating system. Except for Hopf bifurcation, some other local bifurcations also have been studied here. The figures in the numerical simulation have depicted that, if there is a lesser number of one prey present in a system, then with time, switching to the other prey, in fact, increases the predator population significantly.
Control of TITO processes using sliding mode controller tuned by ITAE minimizing criterion based Nelder-Mead algorithm
Authors: Kumar E Govinda , J Arunshankar
Published: July 2021

Control of multi input and multi output (MIMO) process with interaction is often encountered in process industry. Such MIMO processes are controlled using conventional sliding mode controller (SMC) and tuned by integral square error (ISE) minimizing criterion based Nelder-Mead algorithm. SMC tuned by integral time absolute error (ITAE) minimization criterion based Nelder-Mead algorithm is proposed in this work. Three categories of two inputs and two outputs (TITO) process models are represented in the matrix form, with each of the matrix element representing a first order plus dead time (FOPDT) process. These TITO models are categorized based on the ratio ε, between dead time and time constant of the FOPDT model which forms the matrix element of the TITO model. The performance of conventional SMC is evaluated for these three categories of TITO models, in which the TITO process models with the ratio ε greater than the one, exhibited by poor closed loop performance, whereas the proposed SMC when applied to the these process models delivered superior closed loop performance.
A statistical study of COVID-19 pandemic in Egypt
Authors: Radwan Taha
Published: July 2021

The spread of the COVID-19 started in Wuhan on December 31, 2019, and a powerful outbreak of the disease occurred there. According to the latest data, more than 165 million cases of COVID-19 infection have been detected in the world (last update May 19, 2021). In this paper, we propose a statistical study of COVID-19 pandemic in Egypt. This study will help us to understand and study the evolution of this pandemic. Moreover, documenting of accurate data and taken policies in Egypt can help other countries to deal with this epidemic, and it will also be useful in the event that other similar viruses emerge in the future. We will apply a widely used model in order to predict the number of COVID-19 cases in the coming period, which is the autoregressive integrated moving average (ARIMA) model. This model depicts the present behaviour of variables through linear relationship with their past values. The expected results will enable us to provide appropriate advice to decision-makers in Egypt on how to deal with this epidemic.
LCBRG: A lane-level road cluster mining algorithm with bidirectional region growing
Authors: Gong Xianyong , Wu Fang , Xing Ruixing , Du Jiawei , Liu Chengyi
Published: July 2021

Lane-level road cluster is a most representative phenomenon in road networks and is vital to spatial data mining, cartographic generalization, and data integration. In this article, a lane-level road cluster recognition method was proposed. First, the conception of lane-level road cluster and our motivation were addressed and the spatial characteristics were given. Second, a region growing cluster algorithm was defined to recognize lane-level road clusters, where constraints including distance and orientation were used. A novel moving distance (MD) metric was proposed to measure the distance of two lines, which can effectively handle the non-uniformly distributed vertexes, heterogeneous length, inharmonious spatial alignment, and complex shape. Experiments demonstrated that the proposed method can effectively recognize lane-level road clusters with the agreement to human spatial cognition.
Elevated levels of neopterin and pentraxin 3 in patients with rheumatoid arthritis
Authors: Ekin Sabri , Sivrikaya Abdullah , Akdağ Turan , Yilmaz Sema , Gülcemal Semral
Published: July 2021

Objectives

As a systemic inflammatory disease, rheumatoid arthritis (RA) is the most common inflammatory arthritis in the population and there is no specific diagnostic marker in laboratory tests. The purpose of the study was to determine whether serum neopterin and pentraxin 3 (PTX3) levels may be a marker of increased inflammation in RA patients.

Materials and methods

The study were consist of 30 RA patients and 30 healthy controls who were admitted to the department of rheumatology. Blood specimens were taken from both group, and the levels of neopterin were analyzed by chromatography method (HPLC) and the PTX 3 levels were measured by enzyme-linked immunosorbent assay (ELISA). All data and demographic characteristics of participants were also recorded.

Results

Serum neopterin and PTX 3 levels of the patient group (25.99 ± 7.24 ng/mL and 4.19 ± 1.01 ng/dL, respectively) was higher than the control group (9.55 ± 0.74 ng/mL and 2.23 ± 0.39 ng/dL, respectively). These results were remarkable significant (p<0.01). No statistically significant correlation was found between age-PTX 3, age-neopterin and PTX 3-neopterin parameters in the patient group. In the control group, a significant negative correlation was found between age and PTX 3 (p<0.05), and a positive correlation between neopterin and PTX 3.

Conclusions

Consequently, the serum neopterin and PTX 3 levels were higher in RA patients as compared to the healthy individuals. Our study suggest that there is a relation between neopterin and PTX 3 levels with RA patients. These findings suggest that neopterin and PTX 3 are important markers in the monitoring of RA disease.
Detection of symmetrical fault and discrimination from power swing using MOPSVC approach
Authors: Andanapalli Kumarraja , Biswal Monalisa
Published: July 2021

Distance relay are designed with swing blocking/tripping logic to maintain reliable and secure operation of power system. To prevent this from happening, the relay is functioned with a power swing blocking (PSB) logic. However, ensuring proper detection to swing event requires to overcome from the dependable situation such as three-phase fault. The relay refuses to behave normally if both swing and three-phase fault occur simultaneously. Reliable setting is essential to generate trip/block command. Unsymmetrical faults are easily detected during the swing condition due to the presence of negative and zero sequence components, but such components are absent in the case of symmetrical/three-phase fault. As a result, symmetrical fault under blocking condition is unidentified many a times by the distance relay, arising security issues. To improve the relay operation during swing and symmetrical fault conditions, a MOPSVC (multiplication of positive sequence voltage and current) based index is developed in this work. The MOPSVC index helps to discern power swing from three-phase fault. To test the efficacy of the method, a 230 kV, 50 Hz two-area four machine system, and Indian Eastern Regional Grid (IERG) network are considered. Simulation task is conducted using EMTDC/PSCAD software. To investigate the performance of the proposed method, various swing phenomena, faults, CT saturation, switching transients, and the presence of noise cases are considered, and the results demonstrate the robustness of the proposed algorithm. Responses under stressed power system conditions are also investigated, and a report on comparisons with existing methods is provided. Simulated results confirm that the proposed algorithm can balance the dependability and security aspects of the protection logic.
Effect of Jyoti-Trataka on intraocular pressure, autonomic control, and blood glucose in diabetic patients with high-tension primary open-angle glaucoma: a randomized-controlled trial
Authors: Ismail Ali Mohamed Ali , Abd Elfatah Abo Saif Hatem Fawzy , El-Moatasem Mohamed Alaa Mohamed
Published: July 2021

Objectives

Yoga is used as a complementary therapy to control the symptomatic and complicated consequences of type 2 diabetes mellitus (T2DM) but the effect of Jyoti-Trataka yoga (gazing steadily at a 4-feet away-fixed candle flame) on the intraocular pressure (IOP), autonomic control, and fasting blood glucose (FBG) in T2DM patients with high-tension primary open-angle glaucoma (POAG) was not previously investigated. This study aimed to search the effect of Jyoti-Trataka on IOP, systolic blood pressure (SBP), respiratory rate (RR), diastolic blood pressure (DBP), FBG, and pulse rate (PR) in T2DM patients with bilateral high-tension POAG.

Methods

The patients with a 52- to 67-year range and body mass index below 30 kg/m2 were randomly assigned to one of two 30-patient groups, study or control groups. Besides the administered oral hypoglycemic drugs by both groups, the study group only received one month of daily 55-min Jyoti-Trataka session.

Results

A significant decrease (p<0.05) was identified after the comparison between the pre and post SBP, RR, DBP, FBG, IOP of both eyes, and PR in the study group while the control group exhibited no significant changes of all measures (p>0.05). In-favor-of the study group, the between-group post-treatment comparison showed a significant improvement of all measures (p<0.05).

Conclusions

Jyoti-Trataka is a good yogic complementary therapy that can be used to regulate autonomic functions, blood glucose, and IOP in T2DM patients with high-tension POAG.
Application of portrait recognition system for emergency evacuation in mass emergencies
Authors: Xu Ke
Published: July 2021

A portrait recognition system can play an important role in emergency evacuation in mass emergencies. This paper designed a portrait recognition system, analyzed the overall structure of the system and the method of image preprocessing, and used the Single Shot MultiBox Detector (SSD) algorithm for portrait detection. It also designed an improved algorithm combining principal component analysis (PCA) with linear discriminant analysis (LDA) for portrait recognition and tested the system by applying it in a shopping mall to collect and monitor the portrait and establish a data set. The results showed that the missing detection rate and false detection rate of the SSD algorithm were 0.78 and 2.89%, respectively, which were lower than those of the AdaBoost algorithm. Comparisons with PCA, LDA, and PCA + LDA algorithms demonstrated that the recognition rate of the improved PCA + LDA algorithm was the highest, which was 95.8%, the area under the receiver operating characteristic curve was the largest, and the recognition time was the shortest, which was 465 ms. The experimental results show that the improved PCA + LDA algorithm is reliable in portrait recognition and can be used for emergency evacuation in mass emergencies.
Coastal marine gravity modelling from satellite altimetry – case study in the Mediterranean
Authors: Abulaitijiang Adili , Andersen Ole Baltazar , Barzaghi Riccardo , Knudsen Per
Published: July 2021

The coastal marine gravity field is not well modelled due to poor data coverage. Recent satellite altimeters provide reliable altimetry observations near the coast, filling the gaps between the open ocean and land. We show the potential of recent satellite altimetry for the coastal marine gravity modelling using the least squares collocation technique. Gravity prediction error near the coast is better than 4 mGal. The modelled gravity anomalies are validated with sparse shipborne gravimetric measurements. We obtained 4.86 mGal precision when using the altimetry data with the best coastal coverage and retracked with narrow primary peak retracker. The predicted gravity field is an enhancement to EGM2008 over the coastal regions. The potential improvement in alti- metric marine gravity will be beneficial for the next generation of EGM development.
Informal Sector Taxation and Enforcement in African Countries: How plausible and achievable are the motives behind? A Critical Literature Review
Authors: Mpofu Favourate Y Sebele
Published: July 2021

Taxation is a fundamental tool for revenue generation, economy building and sustainability, reducing market externalities, regulating trade, stimulating representation and achieving tax justice as well as building state accountability and responsiveness. The informal sector in developing countries has been considered a hindrance to effective domestic revenue mobilisation, hence the rejuvenated focus to bring the sector into the tax baskets. Through a critical literature review, this study sought to identify the varying motivations tabled by the various stakeholders (policymakers, scholars and tax administrators) in literature on the need to administer tax on this sector and to strengthen enforcement and to evaluate the plausibility of these motives critically. Literature search was done through Google scholar and this was also aided by snowballing. The motives were aggregated into five major groups: the magnitude of the sector and revenue implications, growth motive, the governance gains, equity considerations and the boosting of tax morale and compliance in the formal sector. This study, therefore, conducted a profound evaluative analysis of literature on these motivations, pinpointing any voids that future research could address and accordingly sought to contribute to the guidance offered to policymakers on how to improve IS taxation. In order to balance the mobilisation of revenue needs and the sector’s contribution to other government objectives such as those outlined in the United Nations Sustainable Goals 1, 8 and 10 on poverty, decent work and economic growth, and reduced inequalities, governments and policymakers need to make an informed analysis.
Handwritten culture through digital native eyes: student participation in the digital fragmentology project Textus invisibilis
Authors: Molinari Alessandra
Published: July 2021

The present paper addresses the issue of how interest-driven learning can enhance an attitude of student-generated inquiry in the learning process so to promote student participation in university research projects. The research question is how wonder as an epistemic emotion may sustain students’ interest-generated questioning, and how the latter may influence the design of a university research project. As a case-study, the paper describes a laboratory on palaeography which took place in Spring 2019 at an Italian State Archive within a University bachelor program in the context of a digital fragmentology project. To design the laboratory and establish qualitative analysis methods for its data, an interdisciplinary educational approach was designed that combines interest-driven learning, emotion theory, value theory, hermeneutics, and User Experience, on the background of Ernst Cassirer’s view of a human being as an animal symbolicum. In the laboratory, the students’ questions and hypotheses arising from their interaction with historical scripts and Medieval handwriting culture are helping redesign some aspects of the research project Textus invisibilis both on the level of the research design and of the team composition, as well as pointing to a novel relevance of state archives and historical libraries in higher education.
A Novel Method for RFID Reading Performance Measurement Based on the Effects of Exposure to Salt Mist
Authors: Yu Xiaolei , Ding Cheng , Zhu Zhuo , Liu Zhenlu , Li Lin , Zhao Zhimin
Published: July 2021

Aiming at the problem that salt mist seriously affects the reading performance of radio frequency identification (R FID) tags, the salt mist effects on the performance of RFID tags are researched through simulation and measurement. The reading range of RFID tags in the salt mist environment is reduced because the boundary conditions of the test chamber reduce the antenna efficiency and gain. As the concentration of the salt mist in the test chamber increases, the environmental conductivity in the test chamber increases, and the RFID reading distance of the tag decreases. In this paper, a theoretical formula is proposed for calculating RFID reading distance in salt mist environment. Besides, RFID dynamic identification based on the salt mist environment platform is designed. Corresponding functions are obtained by fitting the experimental data. This function establishes the relationship between salt mist concentration and the RFID reading distance. The experiment shows this theoretical formula is feasible, and the system has high practicability. At the same time, the system shows that the reading distance decreases as long as the concentration of the salt mist increases.
Development of Injectable Water-Stop for Grouting in Underground Concrete Structure Joint
Authors: Bae Abraham , Jung Eunyoung , Seo Bogsun , Jae Lee Sun
Published: July 2021

In the case of water leakage at the diaphragm wall concrete panel joint, secondary grouting is usually conducted from outside of the structure after construction, but the remedial treatment requires high costs and time because of the uncertainty of the leakage location. The idea of this study is to incorporate the grouting hose into the conventional water-stop installed at the construction joint, and thus, grouting can be effectively performed. A state of the practice of water-stop, inside which grouting material can be injected, was designed and manufactured. Accordingly, an injection methodology was developed. The original geometry of the commercial water-stop was not changed, and the existing center hole was selectively renovated as an injecting tube. Micro-opening on the tube surface was optimized as a slit shape for discharging grouting material. The injection system and methodology were suitably created to fit to this product. Injection performances were verified with various experiments for pure water, microcement, modified acryl, and polymer urethane. Real-scale vertical injection experiments at 15 m of height proved that the developed water-stop can be applicable for commercial grouting materials within 30 minutes. A workable threshold viscosity of grouting material would be estimated to be 200 cP. Workable injection pressures are recommended after both actual injection tests and numerical analysis; 2–5 bar for materials with low viscousness, such as microcement and modified acryl, and 5–8 bar for high-viscous materials, such as polymer urethane. An injection test at concrete joints successfully demonstrated grouting performance. Long-term waterproofing capability was proved against continuous 5–bar application, representing 50 m of water pressure for a consecutive 15 months.
A Contribution of the Analysis of the Road Macrotexture and Microtexture Roles vis-à-vis Skid Resistance
Authors: Kane Malal
Published: July 2021

Skid resistance of roads enables drivers to shorten their stopping distances and to follow their desired trajectories on curves, too. The road texture remains the principal parameter governing skid resistance, especially in wet conditions. That texture is composed of a multitude of wavelengths with the microtexture and macrotexture considered to be the most important vis-à-vis to skid resistance. The present work contributes to the numerous analyses of the role of these two texture scales, as many authors have done before. It is based on the physical separation of these two scales of textures using an empirical mode decomposition and systematic identification of their roles on skid resistance using a dynamic friction model. The results found in this present work consolidate well the findings of previous works. Indeed, they show that the higher the microtexture is, the better the skid resistance will be at low speeds. Furthermore, the higher macrotexture is, the better the skid resistance is at high speed. These results have led to the proposal of algebraic relations linking skid resistance to microtexture and macrotexture at all speeds, constituting then a clear step forward compared to previous works.
PENGEMBANGAN MEDIA LIFT THE FLAP BOOK MATERI MENULIS KALIMAT EFEKTIF
Authors: Sari Indria Prawita
Published: July 2021

Abstrak

            Penelitian ini dilatar belakangi oleh rendahya keterampilan siswa dalam menulis kalimat efektif. Hal ini terjadi karena kurangnya media pembelajaran bahasa Indonesia yang inovatif. Penelitian ini bertujuan untuk mengembangkan media lift the flap book untuk siswa kelas III SD yakni, menghasilkan media lift the flap book, menguji kelayakan media lift the flap book, dan menguji keefektifan media lift the flap book. Metode penelitian yang digunakan adalah Research and Develompent (R&D).  Hasil uji kelayakan lift the flap book yaitu dari ahli media sebesar 97,7% dan ahli materi sebesar 90,9%. Media lift the flap book efektif digunakan sesuai hasil uji t menunjukkan -t hitung< -t tabel ( -5,67 < -1,68 ), maka Ho ditolak dan uji N-Gain pretest dan posttest diperoleh sebesar 0,45 dengan kriteria sedang. Simpulan penelitian ini adalah media yang dikembangkan sangat layak dan efektif digunakan dalam pembelajaran serta dapat meningkatkan keterampilan siswa dalam menulis kalimat efektif.

This research was motivated by the poor skills of students in writing effective sentences. This occured due to the lack of innovative learning media in Bahasa Indonesia subject. This study aimed to develop lift the flap book media for the third grade students, namely, to produce lift the flap book media, to test the viability and the effectiveness of lift the flap book media. The research method used Research and Development (R&D). The result of the lift the flap book viability test from media experts by 97.7% and from content experts by 90.9%. The media lift the flap book was effectively used according to the results of the t test showing -t count <-t table (-5.67 <-1.68), so Ho was rejected and the N-Gain test on pretest and posttest obtained a value of 0.45 with moderate criteria . The conclusion of this research is that the media developed was very viable and effective in learning and can improve students' skills in writing effective sentences.
Hubungan Minat Baca dengan Hasil Belajar Bahasa Indonesia
Authors: Dani Galuh Rahma
Published: July 2021

Abstrak

Tujuan penelitian ini adalah untuk menguji hubungan positif antara minat baca dengan hasil belajar bahasa Indonesia siswa kelas V SDN Gugus Dewi Sartika Kabupaten Grobogan. Penelitian ini menggunakan metode kuantitatif dengan desain penelitian korelasi. Populasi dalam penelitian ini berjumlah 154 siswa. Teknik pengambilan sampel adalah simple random sampling, dengan sampel sejumlah 95 siswa. Variabel penelitian meliputi minat baca sebagai variabel bebas dan hasil belajar Bahasa Indonesia sebagai variabel terikat. Teknik pengumpulan data yaitu angket dan dokumentasi. Analisis data menggunakan analisis statistik, uji normalitas, korelasi product moment, uji signifikansi, dan koefisien determinasi. Hasil penelitian menunjukkan bahwa terdapat hubungan yang positif dan signifikan antara minat baca dengan hasil belajar bahasa Indonesia, nilai rhitung = 0,578 dan termasuk kategori sedang serta berkontribusi sebesar 33%. Simpulan penelitian ini adalah terdapat hubungan positif yang signifikan antara minat baca dengan hasil belajar Bahasa Indonesia siswa kelas V SD Negeri Gugus Dewi Sartika Kabupaten Grobogan.

The purpose of this study was to examine the positive relationship between reading interest and Indonesian language learning outcomes of 5th grade elementary school of cluster Dewi Sartika, Grobogan. This study uses quantitative methods with a correlation research design. The population in this study amounted to 154 students. The sampling technique was simple random sampling, with a sample of 95 students. The research variables included reading interest as the independent variable and Indonesian learning outcomes as the dependent variable. Data collection techniques are questionnaires and documentation. Data analysis used statistical analysis, normality test, product moment correlation, significance test, and coefficient of determination. The results showed that there was a positive and significant relationship between reading interest and Indonesian language learning outcomes, the value of rcount = 0.578 and it was in the medium category and contributed 33%. The conclusion of this study is that there is a significant positive relationship between reading interest and Indonesian language learning outcomes of 5th grade elementary school of cluster Dewi Sartika, Grobogan.
KEEFEKTIFAN MEDIA VIDEO PEMBELAJARAN DARI YOUTUBE TERHADAP KETERAMPILAN MENYIMAK DAN MELAGUKAN TEMBANG MACAPAT KELAS IV
Authors: Raharjayanti Ali Fiana
Published: July 2021

Penelitian ini bertujuan untuk menguji keefektifan media video pembelajaran dari YouTube terhadap keterampilan menyimak dan melagukan tembang macapat kelas IV SD Gugus Pattimura Kota Semarang. Desain penelitian menggunakan quasi experimental dengan bentuk nonequivalent kontrol group. Teknik pengumpulan data menggunakan tes dan nontes. Teknik pengambilan sampel menggunakan cluster sampling. Analisis uji hipotesis menggunakan uji z, uji t, N-gain. Rata-rata nilai posttest kelas eksperimen I (81,53) lebih dari kontrol (62,80). Hasil dari uji hipotesis yaitu: (1) media video pembelajaran dari YouTube kelas eksperimen lebih efektif daripada media teks kelas kontrol pada keterampilan menyimak tembang macapat; (2) media video pembelajaran dari YouTube kelas eksperimen sama efektifnya dengan media teks kelas kontrol pada keterampilan melagukan tembang macapat. Simpulan dalam penelitian ini adalah media video pembelajaran dari YouTube lebih efektif dibanding media teks dalam keterampilan menyimak namun sama efektifnya dalam keterampilan melagukan tembang macapat kelas IV SD Gugus Pattimura Kota Semarang.
KEEFEKTIFAN MODEL REALISTIC MATHEMATICS EDUCATION BERBANTUAN MEDIA DAKON TERHADAP HASIL BELAJAR PERKALIAN
Authors: Ratna Wati Erna Dwi
Published: July 2021

Abstrak

Penelitian ini bertujuan untuk menguji keefektifan model realistic mathematics education berbantuan media dakon terhadap hasil belajar operasi hitung perkalian kelas III SDN Gugus Srikandi Gunungpati Semarang. Jenis penelitian yang digunakan yaitu quasi experimental design dengan bentuk nonequivalent control group design. Populasi pada penelitian ini yaitu seluruh siswa kelas III dari 8 SDN Gugus Srikandi. Pengambilan sampel menggunakan teknik cluster sampling atau area sampling. Sampel yang ditetapkan yaitu siswa kelas III SDN Pongangan sebagai kelas eksperimen dan siswa kelas III SDN Cepoko sebagai kelas kontrol. Teknik pengumpulan data menggunakan tes dan nontes. Hasil penelitian menunjukan peningkatan hasil belajar siswa kelas eksperimen sebesar 32,03 dan kelas kontrol sebesar 21,5. Hasil uji hipotesis menunjukan nilai thitung (3,57) > ttabel (1,67) sehingga rata-rata hasil belajar operasi hitung perkalian kelas eksperimen lebih dari rata-rata hasil belajar operasi hitung perkalian kelas kontrol. Selanjutnya hasil n-gain kelas eksperimen sebesar 0,7003 dengan kriteria tinggi dan nilai n-gain kelas kontrol sebesar 0,4205 dengan kriteria sedang. Berdasarkan hasil tersebut dapat disimpulkan bahwa model realistic mathematics education berbantuan media dakon lebih efektif daripada model konvensional terhadap hasil belajar operasi hitung perkalian siswa kelas III SDN Gugus Srikandi Gunungpati Semarang.

This study aimed to test the effectiveness of realistic mathematics education models assisted by the dakon media on learning outcomes of multiplication operations of 3rd grade elementary school of Cluster Srikandi Gunungpati Semarang. This type of research is a quasi experimental design with a form of nonequivalent control group design. The population in this study were all students of 3rd grade from 8 SDN Srikandi Cluster. Sampling used cluster sampling techniques or area sampling. The determined samples were the third grade students of Pongangan Elementary School as an experimental class and third grade students of Cepoko Elementary School as a control class. Data collection techniques used test and nontest. The results showed an increase in student learning outcomes of the experimental class by 32.03 and the control class by 21.5. Hypothesis test results showed the value of t-count (3.57)> t-table (1.67) so that the average learning outcomes of the experimental class multiplication operations is higher than the average learning outcomes of the control class multiplication operations. Furthermore, the n-gain of the experimental class was 0.7003 with high criteria and the n-gain value of the control class was 0.4205 with moderate criteria. Based on these results, it could be concluded that the realistic mathematics education model assisted by the media of dakon was more effective than the conventional model of learning outcomes of multiplication operations of 3rd grade students at elementary school of Cluster Srikandi Gunungpati Semarang.
APEL PENGUATAN PENDIDIKAN KARAKTER BENTUK PENANAMAN SIKAP TANGGUNG JAWAB SISWA SD
Authors: Triyani Eva
Published: July 2021

Tujuan penelitian ini adalah mendeskripsikan penanaman sikap tanggung jawab siswa kelas 3A SDN Tambakaji 01 melalui apel penguatan pendidikan karakter. Penelitian ini menggunakan metode deskriptif kualitatif. Pengumpulan data menggunakan teknik observasi, catatan lapangan, wawancara, angket, dan dokumentasi. Teknik analisis data dilakukan dengan uji keabsahan menggunakan triangulasi sumber, triangulasi teknik, dan triangulasi waktu. Kemudian melakukan uji konfirmabilitas. Hasil penelitian ini menunjukkan bahwa: (1) apel penguatan pendidikan karakter memiliki tiga kegiatan yang dijadikan sebagai sarana penanaman sikap tanggung jawab syakni pembiasaan, pemberian teladan, serta penguatan; (2) Hambatan pelaksanaan apel penguatan pendidikan karakter meliputi faktor cuaca yang kurang mendukung, letak kelas yang jauh dari lapangan, kurangnya bimbingan dan arahan guru kelas 3A serta rasa malas siswa kelas 3A; (3) Siswa kelas 3A memberikan respon penerimaan yang ditunjukkan dengan antusias dan rasa semangat siswa kelas 3A serta respon penolakan yang ditunjukkan dengan masih terdapat siswa yang malas dan tidak mengikuti apel penguatan pendidikan karakter.
HUBUNGAN KEBIASAAN BELAJAR DAN DISIPLIN BELAJAR DENGAN HASIL BELAJAR IPS
Authors: Setiawan Agil
Published: July 2021

Abstrak

Tujuan penelitian ini adalah untuk menguji hubungan kebiasaan belajar dan disiplin belajar dengan hasil belajar IPS siswa kelas IV SDN Gugus Sadewa Kecamatan Petanahan Kabupaten Kebumen. Penelitian ini adalah penelitian kuantitatif jenis korelasi. Teknik sampel yang digunakan adalah Proportional Random Sampling sebanyak 103 siswa. Teknik pengumpulan data menggunakan angket, dokumentasi, dan wawancara. Teknik analisis data dengan analisis statistik deskriptif dan analisis product moment. Hasil penelitian menunjukkan bahwa: (1) terdapat hubungan yang positif dan signifikan antara kebiasaan belajar dengan hasil belajar IPS, nilai rhitung = 0,749 dan termasuk kategori kuat serta berkontribusi sebesar 54,2%; (2) terdapat hubungan yang positif dan signifikan antara disiplin belajar dengan hasil belajar IPS, nilai rhitung = 0,777 dan termasuk kategori kuat serta berkontribusi sebesar 57,6%; (3) terdapat hubungan yang positif dan signifikan antara kebiasaan belajar dan disiplin belajar secara bersama-sama dengan hasil belajar IPS, nilai rhitung = 0,790 termasuk kategori kuat serta berkontribusi sebesar 62,3%.  

Abstract

The purpose of this research was to examine the correlation between study habits and learning discipline with social studies learning outcomes of 4th grade students in Cluster Sadewa Elementary School Petanahan Kebumen. This is a quantitative research correlation design. The sample technique was proportional random sampling of 103 participants. Data collection technique were questionnaires, interview, and documentation. These data were analyzed by having descriptive statistic analyzed and product moment analyzed. The result of this research showed that (1) there was a positive and significant correlation between study habits and social studies learning outcomes, rcount = 0.749 which included in strong category and contribution of 54.2%; (2) there was a positive and significant correlation between learning discipline and social studies learning outcomes, rcount = 0.777 which included in strong category and contribution of 57.6%; (3) there was a positive and significant correlation study habits and learning discipline toward social studies learning outcomes, rcount = 0.790 which included in strong category and contribution of 62.3%.