bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Use of ICT in Teaching: Lecturers’ Perceptions, Obstacles, and Expectations
Authors: Bansa Y A , Asrini  
Published: March 2020

Abstract
Since the technology has been developed, Educators should consider this to be a value for educational purposes. In millennial teaching, the use of ICT is common nowadays especially in higher education. The use of ICT is meaningful and helpful for lecturers to enhance their teaching performance. This study attempts to investigate the lecturers’ perceptions, lecturers’ obstacles, and lecturers’ expectations on the use of ICT in teaching. The researcher sees a need to carry out this study as it provides a platform to discover pedagogical implications that would benefit the lecturer in terms of using ICTs as media in their teaching. The respondents of this research were 40 lecturers in higher education of economics study in Sumatra, Indonesia. The lecturers’ perceptions, lecturers’ obstacles, and lecturers’ expectations were measured through a questionnaire and an interview. The findings showed most of lecturers had positive perception towards it, limited knowledge and limited understanding on how to integrate ICT into teaching which were dominant obstacles for respondents when using ICT into teaching. Respondents hope that an increased use of the computer would make the class more interactive, to use computers to do more interesting and imaginative work, computers could be used to provide more interactive activities for students, would provide students with more practical and useful knowledge, and they need tutor to teach how to use software or how to integrate ICT into teaching. The results of this study is beneficial for educators in incorporating ICT into their teaching repertoire.
Primary Valuation of Coastal Flood Impact to Fish Farming in Brebes, Central Java
Authors: Nirwansyah Anang Widhi , Suwarsito  
Published: March 2020

Abstract
High tide event has been recognized in most of coastal area especially in urban region. Meanwhile, there is still limited interest on tidal flood impact on non-urban area including fish farming in developing region. This study aims to identify coastal flood due to high tide event in Brebes, Central Java and its impact on fish farming area. Here we local information from in-depth interview to local group of fish farming and Geographic Information System (GIS) within inputs from national seamless Digital Elevation Model (DEM) data from \ Geospatial Agency (BIG), and land use data from Google Earth. Additionally, this study also propose local context of coastal flood events on mapping the impact upon fish farming area. This research found that 3,309.53 ha of fish farming area has been flooded in the morning event of and 4,810.32 ha in the afternoon of mangsa peteruan. Meanwhile, in mangsa lanjar, the morning event has submerged around 4,521.72 ha, and 3,703.17 ha for afternoon event. This study depicts beneficial information for coastal zone planning as well as coastal disaster risk management in Indonesia.
Bioprospects From Clamshell Of Geloina Sp As Calcium Substitution Material for Poultry In Indonesia
Authors: Tumisem  , Ramadhan Satriya 
Published: March 2020

Abstract
In Indonesia the use of clamshell for calcium substitution of poultry has not been implemented. Some research results suggest that clamshell have very high calcium levels. Clamshell can be used as an enhancer of calcium levels in animal feed, especially in poultry. Increased calcium levels in poultry will help in the process of forming eggshells. The calcium needs of poultry farmers in Indonesia meanwhile are being met from snail intake. This intake is needed by farmers, especially for improving the quality of the yolk, in addition to the formation of eggshells. Clamshells of Geloina sp. In Indonesia there is still not much utilization. Thus this study aims to analyze the calcium content of Geloina sp mussels as calcium substitution material for poultry and the condition of poultry eggs produced by farmers. The design or approach in this study was a quantitative research with survey and experiment. The method used in this study was a laboratory and farmers. Activities applied in laboratory during the study consisted of two activities, namely: 1) sample preparation and 2) analysis of substance elements and chemical compounds with Atomic Absorption Spectrophotometer method (AAS). The results showed that the Powder Clamshell of Geloina sp. had and average elements and chemical compounds contained were Ca level (94.90%), Na level (0.48%), P level (not detected), and CaCO3 level (7.76%). Element and chemical compounds levels contained in the Powder Clamshell of Geloina sp. had a great potential if it was used and treated as good as possible. It can be an alternative solution in the prevention of waste powder clamshell of Geloina sp.) untapped, furthermore it could be applied to the manufacture of products to give added value to support the economy of rural communities in Indonesia. The results of poultry eggs in the third treatment (addition of rations with shellfish powder as much as 35%) have the ability to lay eggs every day with an average frequency of 1 day 1 egg. From the results of this activity it was proven that 65% of poultry had an increased frequency of laying eggs.
Disaster mitigation tutorial based on android
Authors: Mustafidah Hindayati , Febriyanto Erwin , Suwarsito  , Sriyanto Sriyanto 
Published: March 2020

Abstract
A natural disaster is a situation where an unexpected arrival. In that condition damage and even death can occur for humans, animals and plants. The occurrence of natural disasters cannot be prevented, but the community can minimize the impact that occurs by seeking knowledge about how to reduce the impact of disaster risk or what is called disaster mitigation. The development of android-based technology is very popular with the community as a tool for communication and other work. Therefore this research develops a natural disaster mitigation application that can be run on an android phone. This tutorial application is built using Adobe Flash and uses the programming language Actionscript 3.0. The application development method uses the Multimedia Development Life Cycle (MDLC) model with six stages namely concept, design, material collecting, assembly, testing, and distribution. The seven types of natural disasters conveyed in this application are natural disasters that often occur in Indonesia, namely earthquakes, landslides, floods, volcanic eruptions, tornadoes, fires, and tsunamis. This tutorial application provides an explanation of the understanding of each type of natural disaster, how to reduce the impact of disaster risk, and a scientific video on the process of disaster occurrence. This application can be run does not have to use internet access to access information in it, so it can be used at any time.
Utilization of Lightweight Brick Waste Material As a Mixture of Laston AC - WC
Authors: Mirring Palinggi Monika Datu , Elizabeth  
Published: March 2020

Abstract
The use of lightweight bricks that are used as walls in buildings is waterproof and strong in bearigng the burden on the building flor, but after the building is demolished, the demolition of the building is recycled to function as a pavement material on the road surface as a mixture of Laston AC – WC, so waste from the building is functioning again and is not just thrown away.
In this study using lightweight brick building waste material as a filler so that this demolition waste produces a positive value for building demolition waste. As for designing the Laston AC – WC using coarse and fine aggretes from Bili – Bili Gowa Regency with 60/70 penetration asphalt, the mixture is substituted with Cement to get a Conventional Marshall tes and Immertion to get a Time Strenght Index (IKS) as well as in the AC – WC laston mixture through marshall Immersion testing
This research methodology is carried out in the from of testing the characteristics of coarse aggregates and fine aggregates, fillers and asphalt that meet the specification standars and then made a mixture composition design then making test specimens that produce a mixture of Laston AC – WC and then testing to obtain the characteristics of Conventional Marshall. And to get the Marshall Immersion, test Immersion is done in determining the immersion Index (IP) / Residual Strength Index (IKS).
The results of this experimen wiht a combination of lightweight brick filler 0%: 100% Cement filler, 25% lightweight brick fille : 75% Cement filler, 50% lightweight brick filler : 50% Cement filler, 75% lightweight : 25% Cement filler, 100% lightweight : )% Cement filler, characteristics at optimum conditions for mixture of Laston AC – WC use 100% lightweight brick waste then VIM 4,18%, VMA 15,10%, Stability 2400,41 kg, Flow 3,40%, Marshall Quantien (MQ) 706,30% and IKS 92,31%.
The Contribution Of Heterogeneous And Homogeneous Catalysts Towards Biodiesel Quality
Authors: Pasae Yoel , Tangdilintin Srianti , Bulo Lyse , Allo Eda Lolo 
Published: March 2020

Abstract
Homogeneous catalysts and heterogeneous catalysts are two types of catalysts used in the transesterification reaction process to produce biodiesel. Homogeneous catalysts that are commonly used are NaOH and KOH, while heterogeneous catalysts are CaO, super base CaO and Zeolite. This research was conducted to determine the contribution of catalysts NaOH, CaO, super base CaO, and zeolite to the quality of biodiesel produced from bulk palm oil, The reaction process is carried out in a Stirred Tank Flow Reactor equipped with a condenser. The results showed that the use of homogeneous catalysts could increase the acquisition of biodiesel but generally triggered high acid levels in the reaction products. Whereas heterogeneous catalysts can reduce biodiesel acid numbers, although the acquisition of biodiesel is lower than homogeneous catalysts.
Simulation Of Bod And Cod Pollutants Distribution In Tello River Makassar City
Authors: Apriyani Ika , Radjawane Louise Elizabeth 
Published: March 2020

Abstract
Water quality management and water pollution are one of the natural resources that have a very important function for human life that must be managed and secured from the conditions of pollution, therefore efforts are needed to monitor and monitor river water quality. In connection with that, a study was conducted aimed at assessing changes in water quality in the Tallo River through the distribution of pollutant concentrations of BOD (Biological Oxygen Demand), DO (Dissolved Oxygen) and COD (Chemical Oxygen Demand) by analyzing the mathematical model approach in the form of Surface Software Water Modeling System (SMS 8.1) integrated with RMA2 and RMA4. The research method carried explanation was a field survey in the form of data collection of water as many as 5 points in the drainage along the Tallo River. Simulation results show that based on water content requirements in the Republic of Indonesia Government Regulation No. 82/2001 regarding water quality standards it is known that for existing conditions and simulation results it is known that the classification of estuary river water conditions based on Dissolved Oxygen (DO) content is classified as Class 4 and the content of Biochemical Oxygen Demand (BOD) is classified as class I and the content of Chemical Oxygen Demand (COD) is categorized as class IV.
The Effect Of Fumigation Treatment Of King Pineapple Leaf Fiber (Agave Cantala Roxb) On Length Of Fiber Critical Using Epoxy Matrix
Authors: Palungan Musa Bondaris , Tangaran Benyamin , Salu Salma , Tikupadang Karel 
Published: March 2020

AbstractThe purpose of this research was to determine the critical length of the king pineapple leaf fiber (KPLF) due to fumigation treatment with time variations. To determine the critical length is done by pull out test. The pull-out test was conducted to determine the adhesive properties of the KPLF interface with the epoxy matrix by implanting KPLF without and with the fuming treatment into the epoxy matrix then being withdrawn with a certain load and in quantity it can provide tensile stress information which can then be converted into a shear stress fiber with epoxy matrix. The measurement results show the effect of fogging treatment for 15 hours on KPLF, can increase the shear stress of the epoxy matrix interface by 16.75 MPa with a length of 1 mm and a critical length of 4,53 mm.
Model based characterisation of delamination by means of thermographic inspection
Authors: Ratsakou Almpion , Reboud Christophe , Skarlatos Anastassios , Lesselier Dominique 
Published: March 2020

Abstract
The objective of the work presented in this paper is to propose a fast and accurate approach for the characterisation of the delamination in single-layer metallic planar pieces using infrared thermography. This approach is based on a combination of pre-processing techniques and inversion. The inversion has been done in a reduced parameter space since the preprocessing phase gives us information about the location and the shape of the flaws in the transverse plane. The estimation of the flaws’ parameters has been carried out by an iterative data fitting method involving a fast semi-analytical three-dimensional model. The robustness of the proposed approach is numerically assessed in presence of synthetic noisy data sets in different configurations.
NDT/NDE by means of a probabilistic differential compressive sensing method
Authors: Gottardi Giorgio , Hannan Mohammad Abdul , Polo Alessandro 
Published: March 2020

Abstract
A novel microwave imaging (MI) method is proposed to deal with the nondestructive testing and evaluation (NDT/NDE) of dielectric structures. The proposed technique exploits a probabilistic differential contrast source inversion (D-CSI) formulation of the inverse scattering (IS) problem, which is then effectively solved by means of a customized multi-task Bayesian compressive sensing (MT-BCS) solver. Numerical results are shown to assess the effectiveness and robustness of the proposed NDT/NDE method, as well as to compare it. with a single-task (ST-BCS) implementation within the same framework.
Regularization Techniques for Inverse Problem in DOT Applications
Authors: Benfenati A , Causin P , Lupieri MG , Naldi G 
Published: March 2020

Abstract
Diffuse optical tomography (DOT) is an emerging diagnostic technique which uses near–infra–red light to investigate the optical coefficients distribution in biological tissues. The surface of the tissue is illuminated by light sources, then the outgoing light is measured by detectors placed at various locations on the surface itself. In order to reconstruct the optical coefficients, a mathematical model of light propagation is employed: such model leads to the minimization of the discrepancy between the detected data and the corresponding theoretical field. Due to severe ill–conditioning, regularization techniques are required: common procedures consider mainly ℓ
1–norm (LASSO) and ℓ
2–norm (Tikhonov) regularization. In the present work we investigate two original approaches in this context: the elastic–net regularization, previously used in machine learning problems, and the Bregman procedure. Numerical experiments are performed on synthetic 2D geometries and data, to evaluate the performance of these approaches. The results show that these techniques are indeed suitable choices for practical applications, where DOT is used as a cheap, first–level and almost real–time screening technique for breast cancer detection.
Sparse recovery for inverse potential problems in divergence form
Authors: Baratchart Laurent , Villalobos-Guillen Cristobal , Hardin Douglas , Leblond Juliette , Saff Edward 
Published: March 2020

AbstractWe discuss recent results from [10] on sparse recovery for inverse potential problem with source term in divergence form. The notion of sparsity which is set forth is measure- theoretic, namely pure 1-unrectifiability of the support. The theory applies when a superset of the support is known to be slender, meaning it has measure zero and all connected components of its complement has infinite measure in ℝ3. We also discuss open issues in the non-slender case.
Frequency-based inversion of a single wireless link for indoor passive target detection
Authors: Gottardi Giorgio , Abdul Hannan Mohammad , Polo Alessandro , Salucci Marco , Viani Federico 
Published: March 2020

Abstract
In this work, the wireless detection of transceiver-free targets is formulated as an inverse problem and solved using the received signal strength of existing wireless devices. The main goal of the proposed solution is to opportunistically exploit a single wireless link established between two commercial wireless access points for the real-time detection of humans entering the monitored domain. The proposed computational method exploits both an empirical mode decomposition for denoising and a discrete Fourier transform for filtering the received signal strength. A reduced set of highly informative features are used for the automatic learning of a support vector machine classifier and the prediction of target absence/presence probability. A preliminary experiment carried out in a real indoor test site is presented to assess the advantages and limitations of the proposed inversion method.
PCA-Based inversion of WiFi signal for robust device-free indoor target detetion
Authors: Gottardi Giorgio , Abdul Hannan Mohammad , Li Baozhu , Polo Alessandro , Salucci Marco , Viani Federico 
Published: March 2020

Abstract
The spatial and frequency diversity introduced by the recent WiFi standards based on orthogonal frequency-division multiplexing is exploited for the robust wireless detection of device-free targets 111 indoor environments. The arising inverse problem is solved by decomposing the channel state information by means of a customized strategy based on the principal component analysis (PCA) for extracting target-dependent, components from the WiFi signal. The experimental validation of the proposed solution pointed out a robust target detection with failure rates lower than 3 [%] using a single wireless link already deployed in a real office test, field.
A computational inversion method for interference suppression in reconfigurable thinned ring arrays
Authors: Boulos Federico , Dall’Asta Luca , Gottardi Giorgio , Abdul Hannan Mohammad , Polo Alessandro , Salas-Sanchez Aaron , Salucci Marco 
Published: March 2020

Abstract
An inversion strategy for dynamically thinning (i.e.. turning on and off) the radiating elements of ring arrays in order to maximize the signal-to-noise ratio is presented. Since thinned arrays provide only average sidelobe performances, but. the directions of arrival (DoAs) of interferences can be arbitrary, a set. of thinning configurations that. guarantee a sufficient interference rejection in the whole angular region outside the main lobe is off-line selected. The on-off status of the array elements is then dynamically switched among such precomputed thinning sequences until the one providing the best, signal-to-interference performance is identified. A set of numerical results is reported and discussed to assess the effectiveness and potentialities as well as current limitations of the dynamic thinning approach in dealing with interference suppression of ring arrays.
Quantum mechanics in magnetic backgrounds with manifest symmetry and locality
Authors: Davighi Joe , Gripaios Ben , Tooby-Smith Joseph 
Published: March 2020

Abstract
The usual methods for formulating and solving the quantum mechanics of a particle moving in a magnetic field respect neither locality nor any global symmetries which happen to be present. For example, Landau’s solution for a particle moving in a uniform magnetic field in the plane involves choosing a gauge in which neither translation nor rotation invariance are manifest. We show that locality can be made manifest by passing to a redundant description in which the particle moves on a U(1)-principal bundle over the original configuration space and that symmetry can be made manifest by passing to a corresponding central extension of the original symmetry group by U(1). With the symmetry manifest, one can attempt to solve the problem by using harmonic analysis and we provide a number of examples where this succeeds. One is a solution of the Landau problem in an arbitrary gauge (with either translation invariance or the full Euclidean group manifest). Another example is the motion of a fermionic rigid body, which can be formulated and solved in a manifestly local and symmetric way via a flat connection on the non-trivial U(1)-central extension of the configuration space SO(3) given by U(2).
Study on the Influence of Jelly in Polymer Flooding Injection System on Oil Displacement Efficiency
Authors: Xu Quan 
Published: March 2020

Abstract
In this paper, the composition and production conditions of viscous gelatinous substances in the inner walls of filters and pipelines in polymer injection system are analyzed in detail, and the influence of gelatinous substances on the development effect of polymer flooding is studied. A new understanding of the influence of gelatinous substances on the development effect of polymer flooding is obtained. In view of the harmfulness of gelatinous substances, treatment suggestions are put forward and positive countermeasures are taken for industrial field. It has important reference value.
Determination of Arctiin in Xiaoer Qingyan Granules by Capillary Electrophoresis
Authors: Liu Haixing , Wang Lintong 
Published: March 2020

Abstract
This paper investigated the determination of arctiin content in Xiaoer Qingyan granules by high performance capillary electrophoresis (HPCE) method. The borax solution of 37.5 mmol concentration containing 12.5% methanol was chosen as buffer solution. The experiment was performed at a constant voltage of 16 kV and UV detection wavelength of 277 nm. The content of arctiin in Xiaoer Qingyan granules was 3.678mg/g (RSD=1.72%) (n=6). The recovery was in the range of 80.9%-113.4% (n=6). This method is suitable for the detection of the content of arctiin in Xiaoer Qingyan granules.
Experimental Investigation of Wear Behaviour of 40MnB
Authors: Ma Xuejiao , Chen Bo , Feng Kun , Zhu Pengxiao 
Published: March 2020

Abstract
Dry sliding wear (pin-on-disc) tests were carried out under different loads and sliding speeds at room temperature for 40MnB. The present work attempts to explore wear mechanism of 40MnB. Compared with friction speed, it was found that the effect of load is more obvious. At a certain friction speed, the wear loss increase obviously with the increase of load, and the friction coefficient increases at first and then decreases slightly. Increased load leads to higher shear stress and higher interface temperature, thus cause the contact point to adhere and peeled. On the other hand, under a certain load, the friction speed has little effect on the wear rate. Surface temperature increases with the increase of friction speed, making easier plastic flow of the steel. The wear mechanism of 40MnB is adhere wear and abrasive wear.
Strength Prediction Model of High Strength Fly Ash Concrete Based On Mixed Kernel Function
Authors: Zhao Zhongling , Li Jing , Feng Xiwen , Wang Xiao , Gao Mengying 
Published: March 2020

Abstract
In this paper, the proportion of fly ash in cementitious material, the amount of cementitious material and the ratio of water to cement are selected, and the rough set theory is used to process the data. A mixed kernel function support vector machine prediction model with conditional attribute as input and decision attribute as output is established to explore the influence of three factors on the strength of high strength fly ash concrete. The prediction model with high prediction accuracy is selected for optimization. According to the existing test data, the variation law of concrete strength with proportioning parameters is summarized.