bluuebunny/crossref_metadata_2025 huggingface dataset:
El uso de redes sociodigitales en las protestas de los Malnacidos en Hermosillo, Sonora, 2013
Authors: Palazuelos Rojo Isaac de Jesús
Published: November 2019

El objetivo de este artículo es reflexionar en torno a la protesta social contemporánea y su vínculo con el uso de redes sociodigitales. Se presenta un estudio de caso a partir de una reseña de manifestaciones del movimiento social llamado Malnacidos en Hermosillo, Sonora. Plantea un método de etnografía digital mediante la consulta de archivos audiovisuales de Facebook y YouTube. Los resultados mostraron que los entramados de interacciones digitales estimularon la emergencia de un sujeto colectivo que se opuso al paquete fiscal de la entidad emitido en 2013. También se encontró que el movimiento se caracterizó por tipificaciones diferenciadas, las cuales dieron lugar a negociaciones entre ciudadanos y representantes de los poderes ejecutivo y legislativo. Concluye que determinados actores políticos también formaron parte de las acciones reivindicativas. Frente a este hallazgo, el estudio presenta la limitación de haberse enfocado únicamente a la dimensión ciudadana.
Exploring the prospect of marine microalgae Isochrysis galbana as sustainable solid biofuel feedstock
Authors: Sukarni Sukarni , Sumarli Sumarli , Nauri Imam Muda , Purnami Purnami , Mufid Akhmad Al , Yanuhar Uun
Published: November 2019

Among the renewable biomass fuel alternatives, microalgae are the most important future choices owing to its fast growth rate and great capability for CO2 fixation. There are various species in the world, in which each species has its characteristics. This work presents a prospect of marine microalgae Isochrysis galbana for renewable fuel feedstock regarding its biomass abundance, physicochemical properties, and thermal characteristic. The seawater medium in the Erlenmeyer flask was used for the algal culturing. The biomass abundance, in term of specific growth rate and doubling time, was assessed by calculating the culture medium cells number with a hemocytometer and optical microscope. Harvesting was done by precipitating biomass with caustic soda, subsequently filtering, and washing it with distilled water. The biomass sediment had been sun-dried for three days, and then dried biomass was crushed by using the mortar to be a powder. The proximate analysis was arranged by conducting an experiment in according to the test method of ASTM D 3173-11, ASTM D 3175-11, ASTM D 3172-13 and ASTM D 3174-12 for specifying the content of moisture, volatile matter, fixed carbon, and ash of the sample, respectively. The heating value was estimated by using adiabatic bomb calorimeter. The chemical composition of biomass was determined by Energy-dispersive X-ray (EDX) spectrometry. The biomass cellular macromolecular compounds were also evaluated by Fourier transform infrared (FTIR) spectroscopy and compared with its residue. Through eight days observation, it was noticeable that Isochrysis galbana has a specific growth rate of 0.18 d-1 and a doubling time of 3.85 d. The respective moisture, volatile matter, fixed carbon, and ash content were 12.98, 40.10, 7.47, and 39.45 (%, air-dried basis). The energy content algal biomass was 16.22 MJ kg-1. This current investigation encourages that Isochrysis galbana can be viable as one of a future sustainable solid biofuel feedstock.
Hydrodynamic simulation of urban stormwater drain (Delhi city, India) using iRIC Model
Authors: Kumar Satish , Kaushal D.R. , Gosain A.K.
Published: November 2019

Flooding in urban areas takes place mainly due to increased urbanization, decrease in infiltration rate and poor infrastructure for stormwater drainage network. Nays2DFlood is a recently developed solver by iRIC for the simulation of river flow regime. The number of input data requirement is few which makes this solver superior to other models but has been rarely applied to urban catchments. In this paper, a hydrodynamic model was developed to assess the model’s feasibility to simulate urban stormwater drainage system of Delhi, capital city of India for mapping inundation extents using Nays2DFlood solver. The data used in this model is a DEM (5 × 5 m resolution) and daily discharge data of the drains. The simulated drainage is analysed keeping in mind the constraints which were observed during the collection of field data; the storm-water drains are choked, the drains have improper flow gradient or damaged flow gradients. Based on the simulated results, the water depth and velocity profiles were analysed for the drain. The model identified four critical locations where the problem like zig-zag bed slope of the drain, undersized cross-section of the drain and last but not the least the backflow problem which were in close agreement with the observed field data. The flood propagation exactly predicting the inundated area. Thus, Nays2DFlood solver model can also be applied to urban catchments for identifying the flood extent.
Design and implementation of an alternative measurement system for MOSFET-Like sensors characterization
Authors: Zorrilla Luighi Viton , Lezama Jinmi , Acosta Rubén
Published: November 2019

This paper describes the design and implementation of an alternative system to measure electrical parameters (voltage and current) in order to characterize MOSFET-Like sensors. To design a signal conditioning circuit is necessary to understand the sensor behavior, therefore knowing its characteristics is essential. As sensor manufacturers do not usually provide the whole technical information about them, a measurement system is proposed to obtain those sensor characteristics with the aim of modeling the sensor device. This system is based on a MCU which generates voltages and measures currents via an external transimpedance amplifier, and it is supported by a software platform developed upon python based open source tools. Such combination offers a low cost system to stimulate and capture sensor responses which could be processed later to extract the characteristic parameters. The system was tested principally with an Ion Sensitive Field Effect Transistor (ISFET) and results show the VDS-IDS and VGS curves obtained with it.
Manufacture of lightweight clay bricks with improved thermal insulation properties via the incorporation of spent shea waste
Authors: Adazabra A.N. , Viruthagiri G. , Shanmugam N.
Published: November 2019

An effective environmentally correct disposal option for spent shea waste is remarkably constrained by many factors regardless of the disposal method adopted hitherto. Dumping of spent shea waste in farmlands or its landfilling have serious long-term ramifications to environment. Besides, it cannot be openly burned without violating international treaties on global warming issues. For this reason, we incorporated spent shea waste into brick making clay towards the manufacture of lightweight clay bricks with improved insulation properties. In this regard, bricks were prepared under various sintering conditions by replacing 5, 10, 15 and 20 wt.% of the clay material with spent shea waste. The results show bricks fired at 1000 °C with 15 wt.% spent shea waste incorporation is most optimized manufacturing condition. These bricks demonstrated a 13.82 wt.% reduction in weight, compressive strength of 6 Mpa, water absorption of 15.95 % and a beneficial reduced thermal conductivity of 0.31 W/(mK), which translated to about 58.06 % increase in thermal insulation relative to the reference brick samples. This research has therefore provided convincing evidence on the possible widespread valorization of spent shea waste in manufacture of lightweight clay bricks with improved insulation properties. Hence, an ecofriendly disposal method of spent shea waste.
Surface Area and Porosity Development on Granular Activated Carbon by Zirconium: Adsorption Isotherm Studies
Authors: Achari V. Sivanandan , Rajalakshmi A. S. , Jayasree S. , Lopez Raichel Mary
Published: November 2019

In this study, a new series of coconut shell based granular activated carbons (GAC) are prepared by impregnating with zirconium ions as zirconyl chloride and activated under superheated steam. These carbons are designated with activation temperature/ conditions as GAC 383 (activated at 383K), GACO 383 (HNO3 oxidised), GACZR 1273 (ZrOCl2 activated at 1273K) and GACOZR 1273 (HNO3 oxidised, ZrOCl2 activated at 1273K). Surface characteristics of these carbons are evaluated using Boehm titration methods, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction techniques (XRD), Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). The pore volume and the respective specific surface area of each carbon are determined by BET, I plot, Langmuir, Freundlich, and Dubinin-Radushkevich isotherms using N2 adsorption data at 77K. Analysis shows that zirconium ion enhances the surface area and porosity of granular activated carbon. The adsorption characteristics of newly prepared GAC are tested by solid-liquid equilibria using phenol as adsorbate. Equilibrium phenol adsorption data fitted to standard isotherm models of Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) equations. Adsorption constants and parameters indicate that zirconium impregnated granular activated carbons are relatively more efficient for the removal of phenol than the native carbon used.
Performance of a MFS-based mosfet for low temperature applications
Authors: Garcí­a-Ramí­rez P.J. , Sandoval-Ibarra F.
Published: November 2019

A split-drain MAGFET has been designed for detecting magnetic fields at very low temperature. In this design a key parameter is the Hall angle, which indicates the current line deviation due to the Lorentz force acting on the charge carriers. It is well known that reducing the work temperature the carrier mobility increases, therefore an increase in carrier deflection is expected. As a consequence the split-drain MAGFET is able to detect magnetic fields below 1mT at 77K with low power consumption. Experimental results of a wide temperature range (20K< T
A wearable neural interface for real time translation of spanish deaf sign language to voice and writing
Authors: Villa-Angulo R. , Hidalgo-Silva H.
Published: November 2019

This paper describes a work related to the design and implementation of a communication tool for persons with speech and hearing disabilities. This tool provides to the user a Human-Computer interface capable of the capture and recognition of gestures belonging to the Mexican Spanish Sign Alphabet. To capture the manual expressions, a data-glove constructed to sense the position of fifteen articulations of one of the user’s hand is described. A location system that detects the position and movements of the hand with respect to the user’s body is also constructed. The data-glove and location system signals are processed by a pair of programmable automatons. The automaton’s outputs are sent to a personal computer that realizes the gesture recognition and interpretation tasks. Artificial neural network techniques are utilized to implement the mappings of the space of information generated by the instruments to the interpretation space, where the representation of the gestures are found. Once a gesture is captured and interpreted, it is presented in written form through a screen mounted in the clothes of the user, and in verbal form by a speaker.
Tracking unmodelled signals of nonlinear systems via robust sliding mode observer: Application to reacting systems
Authors: Aguilar-López R. , Soto-Cortés G. , Nerí­a-González M.I. , Escarela-Pérez R.
Published: November 2019

The problem of the on-line estimation of the reaction heat in a continuous stirred tank reactor from temperature measurements is addressed in this paper. The proposed uncertainty observer is based on differential algebraic techniques, such that the algebraic observability condition of the uncertainty from noisy temperature measurements is easily verified and the observer structure is very simple, which lead to feasible implementation. The observer proposed is robust against noisy measurements and sustained disturbances. The good performance of the observer is shown by means of numerical simulations.
Mean receiver power prediction for indoors 802.11 WLANS using the ray tracing technique
Authors: Sánchez J. , Castro C. , Villaseñor L.
Published: November 2019

A technique for the modeling of wireless channels, namely the image ray tracing algorithm, is developed in this work to predict the local mean received power of a wireless local area network (WLAN) based on the 802.11a standard operating in the 5 GHz band. This technique has been enhanced in order to account for the propagation of the electromagnetic waves thru a wireless environment, including the absorption and reflection phenomenon at obstacles. The image ray tracing algorithm is used to calculate all the possible propagation paths between a radio transmitter and a receiver. The simulation results of the mean received power strength are compared against field measurements to validate the convenience of the simulation approach.
Structure of the spanish system of satellite of communications
Authors: Sacristán - Romero F.
Published: November 2019

The objectives of satellites HISPASAT are oriented towards the search to satisfy necessities derived from the transport of television and radio signals. It tries the supplying of a basic and safe support of communications for the defence and security of the national territory, the creation of an infrastructure of channels for official networks, routes of data, restoration of connections, rural telephony. Also is wanted to foment the provision of television channels for the Hispanic community in the south and center of America and the broadcasting of services of television for people in general.
Linear vector space derivation of new expressions for the pseudo inverse of rectangular matrices
Authors: Murray Lasso Marco Antonio
Published: November 2019

In this paper, a family of simple formulas for the calculation of the pseudo inverse of a rectangular matrix of less than maximum rank is derived using linear vector space methods. The principal result is that the pseudo inverse A+ of a matrix A can be calculated as A+ = Q(PTAQ)−1PT, where P and Q are rectangular matrices whose r columns are vectors that form a basis for the spaces spanned by the columns and rows, respectively, of matrix A. This leaves the user the liberty to choose the basis to take into consideration other questions such as amount of work needed and ill-conditioning of the matrix that has to be inverted. The formulas are particularized for rectangular matrices that have maximum rank and for the trivial case in which the original matrix is non-singular. Illustrative numerical examples are worked out for several choices of basis vectors and the results are compared with those provided by the program Mathematica through its function PseudoInverse[A].
Measurement of Chua chaos and its applications
Authors: Núñez Pérez Ricardo
Published: November 2019

The present paper shows a single and original measurement circuit, using instantaneous and average readouts of the chaotic dynamic of a Chua’s circuit Vc1(x1) signal with binary decryption, synchrony qualification and chaotic sequence applications. The circuit was simulated (Workbench), developed and tested with our Dadisp Test Automatic System. In operation, the circuit was efficient and successful and could be redesigned to quantify the chaotic dynamic of multiple scrolls and time-delay Chua circuits.
A tool for errors detection in printed circuit boards production
Authors: De Luca Pennacchia A. , De la Fraga L. G. , Martí­nez Hernández U.
Published: November 2019

The progressive implementation of software functions in Integrated Circuits (ICs) has considerably increased the number of transistors and pin connections of ICs. For that reason, Printed Circuit Boards (PCBs) are fabricated with the Surface Mount Technology (SMT) nowadays and IC mounting on PCB is a crucial process that requires high precision. An Automatic Mechanical Montage (AMM) system is used to mount ICs on the sockets using a couple of reference points for every IC in order to find the correct positions for mounting the IC. Due to some factors in the process of PCB development, there are differences between designed and manufactured PCBs, which could generate delays in their production. In this work, a software tool which allows to work with digital images of PCBs is described. This tool finds the differences generated in PCB development, especially the differences in IC reference points using Digital Image Processing (DIP) techniques.
Design of an adaptive LNA for hand‐held devices in a 1‐V 90‐nm standard RF CMOS technology: From circuit analysis to layout
Authors: Becerra-Álvarez Edwin , Sandoval-Ibarra F. , De la Rosa José M-
Published: November 2019

This paper deals the design of a reconfigurable Low‐Noise Amplifier (LNA) for the next generation of wireless hand‐held devices by using a lumped circuit approach based on physical laws. The purpose is not only to present simulation results showing the fulfillment of different standard specifications, but also to demonstrate that each design step has a physical meaning such that the mathematical design flow is simple as well as suitable for hand‐work in both laboratory and classroom. The circuit under analysis, which is designed according to technological design rules of a 90nm CMOS technology, is a two‐stage topology including inductive‐source degeneration, MOS-varactor based tuning networks, and programmable bias currents. This proposal, with reduced number of inductors and minimum power dissipation, adapts its performance to different standard specifications; the LNA is designed to cope with the requirements of GSM (PCS1900), WCDMA, Bluetooth and WLAN (IEEE 802.11b‐g). In order to evaluate the effect of technology parasitics on the LNA performance, simulation results demonstrate that the LNA features NF<1.77dB, S21>16dB, S11<-5.5dB, S22<-5.5 dB and IIP3>-3.3 dBm over the 1.85-2.48 GHz band. For all the standards under study the adaptive power consumption varies from 25.3 mW to 53.3mW at a power supply of 1‐V. The layout of the reconfigurable LNA occupies an area of 1.8mm2.
The effect of Mg content on microstructure in Al‐12wt. %Zn‐x Mg Alloy
Authors: Suárez M. A. , Campillo B. - , Rodrí­guez-Diaz R. A. , Alvarez-Fregoso O. , Juárez-Islas J. A.
Published: November 2019

The effect of adding different Mg contents to an Al‐12wt.%Zn master alloy was experimentally investigated. The Al‐Zn‐Mg alloys were unidirectionally solidified as a function of solidification parameters, temperature gradient GL, solidification front velocity V, and composition C0. The alloys were solidified with a constant temperature gradient (GL=2500K/m) in the solidification front velocity range from 4X10‐6m/s to 1.7X10‐4m/s. The resulting microstructure was characterized to investigate the effect of solidification front velocities and composition on primary dendrite arm spacing, volume percentage of eutectic in interdendritic regions and τ intermetallic phase in α‐Al matrix. Theoretical models for the dendrite arm spacing and dendrite tip radius have been compared with the experimental observations.
Dynamic nonlinear feedback for temperature control of continuous stirred reactor with complex behavior
Authors: López Pérez Pablo A. , Aguilar-López Ricardo
Published: November 2019

The main objective of this work is to present an alternative methodology for the design of a class of integral high order slidingmode controller applied to a class of continuous chemical reactor with complex behavior for temperature tracking purposes. The proposed design is based on the differential geometry framework, where the named reaching trajectory contains a high order sliding mode term in order to diminish chattering. Considering that the proposed technique is model based, an observerbased uncertainty estimator is coupled, which provides robustness against model uncertainties and noisy measurements.Numerical simulations are performed in order to show the capacities of the proposed controller, which is compared with other nonlinear methodologies.
Acceleration of association‐rule based markov decision processes
Authors: Garcí­a-Hernández Ma. de G. , Ruiz-Pinales J. , Reyes-Ballesteros A. , Onaindí­a E. , Gabriel Aviña-Cervantes J. , Ledesma S.
Published: November 2019

In this paper, we present a new approach for the estimation of Markov decision processes based on efficient association rule mining techniques such as Apriori. For the fastest solution of the resulting association‐rule based Markov decision process, several accelerating procedures such as asynchronous updates and prioritization using a static ordering have been applied. A new criterion for state reordering in decreasing order of maximum reward is also compared with a modified topological reordering algorithm. Experimental results obtained on a finite state and action‐space stochastic shortest path problem demonstrate the feasibility of the new approach.
Effect of the Side Cutting–Edge Angle on the Surface Roughness for Aluminum 1350 in the Turning Operation by Taguchi Method
Authors: Rico L. , Noriega S. , García J.L. , Martínez E.A. , Ñeco R. , Estrada F.J.
Published: November 2019

The purpose of this work was to analyze the effect of the side cutting-edge angle on the surface roughness of aluminum 1350 in a turning operation. A Taguchi design L32 was used in this work; the control variables were spindlespeed, feed rate, depth of cutting and the side cutting-edge angle. Several metal cutting experiments and statistical tests provide evidence that the side cutting-edge angle significantly affects the surface roughness with a Statistical F equal to 24.96, mainly, when the side cutting-edge angle is maintained at high level; in this study, the high level was kept to 5.0 degrees. Also, when the high level condition is kept, it causes a major variation of the residual values; consequently, the surface roughness of the workpiece falls out of the specifications demanded by customers.Moreover, the best combination of the cutting parameters for a minimum surface roughness equal to 23.5 μin wasobtained. Finally, further research directions are presented.
Plane-and Space-Filling Trees by Means of Chain Coding
Authors: Bribiesca E. , Espinosa-Dominguez N.
Published: November 2019

An algorithm for constructing fractal trees is presented. Fractal trees are represented by means of the notation called theunique tree descriptor [E. Bribiesca, A method for representing 3D tree objects using chain coding, J. Vis. Commun.Image R. 19 (2008) 184-198]. In this manner, we only have a one-dimensional representation by each fractal tree via achain of base-five digit strings suitably combined by means of parentheses. The unique tree-descriptor notation isinvariant under rotation and translation. Furthermore, using this descriptor it is possible to obtain the mirror image of anyfractal tree with ease. In this paper, we focus on fractal plane-filling trees and space-filling trees.
Extending Pseudo Inverses for Matrices to Linear Operators in Hilbert Space
Authors: Murray-Lasso M. A.
Published: November 2019

In this paper formulas derived by the author for calculating the pseudo inverse of any matrix are generalized to linear operators in Hilbert space. The pseudo inverse is seldom required unless there are many right side vectors, which become known at differet times. The minimum square solution of functional equations is also presented for a single right-side vector. Some definitions and theorems of functional analysis are included. An application to a simple minimum energy optimal contol problem is presented in detail.
Design of Beam-Forming Networks for Multibeam Antenna Arrays Using Coherently Radiating Periodic Structures
Authors: Arce A. , Covarrubias D.H. , Panduro M.A. , Garza L.A.
Published: November 2019

The design of a beam-forming network (BFN) for a multibeam-steerable antenna array using Coherently RadiatingPeriodic Structures (CORPS) is presented. In this design, the input ports of the feeding network are optimized usingthe particle swarm optimization (PSO) algorithm. A two-beam design configuration of CORPS-BFN for a multibeamsteerablelinear array is proposed and analyzed. The results shown in this paper present certain interestingcharacteristics in the array factor response, in terms of sidelobe level (SLL) and directivity (D), for the scannablemultibeam linear array and the feeding network simplification for the design of BFN based on CORPS.
Selection of Soft Magnetic Core Materials Used on an LVDT Prototype
Authors: Yañez-Valdez R. , Alva-Gallegos R. , Caballero-Ruiz A. , Ruiz-Huerta L.
Published: November 2019

Traditionally, the use of ferrite as a core of the linear variable differential transformer (LVDT) is suggested in its designs. Nevertheless, problems related to its brittleness and low tensile strength may be considered as important drawbacks for its use as a core material, especially when its geometry is likely to be modified. This work explores other alternatives related to soft magnetic materials, less used in applications of an LVDT core. By means of a decision matrix, from an assortment of different materials, three alternatives were selected. This proposal provides the identification of those materials with higher qualification values to be used as core material. In order to validate the performance of the selected materials, a prototype of LVDT was designed and fabricated. The design was carried out taking into consideration typical performance specifications. Finally, a comparison of the measurements of sensitivity and linearity of the proposed and traditional materials was made.
Analysis of the Stabilization System of Mimbot Biped
Authors: Escobar M.E. , Rubio H. , García-Prada J.C.
Published: November 2019

Mimbot robot consists of a mechanical system with one degree of freedom activated by a single motor; this robot is capable of simulating the human gait. Mimbot has three  essential mechanisms: the Chebyshev mechanism, the pantograph mechanism and a stabilization system. The studied mechanism is an articulated system of links used in the leg of of the Mimbot biped robot. The technology used in the Mimbot biped is characterized by keeping these design conditions; using a mechanical system based on classical mechanics, the biped must reproduce the trajectory of human gait, energy consumption should be minimal and the prototype should be a low-cost robot. The role of the original stabilization system is to guide the foot to provide support for both legs; however, the position of the foot is not completely parallel to the support surface, which causes variations in the trajectory of the mass center of the biped, causing loss of stability. This paper presents a study of stability in the sagittal plane of the robot, adding a new mechanism that ensures that the stabilizer link is parallel to the ground at all times. Finally, a study of the kinematic and dynamic behavior generated by the modification has been carried out through an analytical model created by Adams ® software.
Average Air Temperature Inside a Room With a Semitransparent Wall With a Solar Control Film: Effect of The Emissivity
Authors: Xamán J. , Álvarez G. , Chávez Y. , Aguilar J.O. , Arce J.
Published: November 2019

En este artículo se presenta un estudio teórico de la transferencia de calor conjugada (convección natural, conducción y radiación) en flujo turbulento de una habitación cuadrada (cavidad), considerando la variación de la emisividad en la pared opaca. La habitación consiste de una pared vertical isotérmica, dos paredes horizontales adiabáticas y una pared semitransparente con y sin película de control de radiación solar. Las ecuaciones gobernantes para flujo turbulento en 2 dimensiones se resolvieron usando una formulación de volumen finito y el modelo de turbulencia k-. Se presentan los resultados para una pared isotérmica a 21ºC y una temperatura exterior de 35ºC. Las dimensiones de la habitación son 4 m de longitud y altura y la radiación solar que cae directamente sobre la pared semitransparente es de 750W/m2 (AM2). La emisividad de las paredes opacas fue variando entre 0.1 ≤ * ≤ 1.0. Los resultados muestran que, con base en la temperatura ambiente del aire y el flujo de calor efectivo dentro de la habitación, la película de control solar bajo estudio resultó ser desventajosa para propósitos de ahorro de energía, para valores de emisividad de * ≤ 0.46. Se determinó para el sistema una correlación para la transferencia de calor en función de las emisividades.
Frequency Transmission Control of Local Networked Control Systems Approach
Authors: Esquivel-Flores O. , Benítez-Pérez H.
Published: November 2019

The use of Network Control Systems has been successful in the industry and therefore has opened several lines of research. Control systems over a communication network include two important considerations, control and scheduling. Co-design strategies are focused on maintaining adequate control performance and maximize the level of service. Network scheduling is the main objective to resolve because through a balanced data load is possible to maintain control performance in a desired level. This article reviews a scheduling strategy based on frequency transition modeled as a linear subsystem, this control reconfigure on line the sensors’ periods. The case of study is the control of a prototype helicopter and by numerical simulations it shows the effect of changing the transmission frequency.
Tracking Control for an Underactuated Two-Dimensional Overhead Crane
Authors: Liu D.T. , Guo W.P.
Published: November 2019

In this paper, the tracking control problem is considered for the payload transportation with an underactuated twodimensional overhead crane. Two sliding mode controllers are designed to perform the trajectory tracking. One is proposed to control hoisting and lowering the suspended payload, and the other one is proposed to control both trolley positioning and payload swaying. Considering the second sliding mode controller is used to control two degrees of freedom (DOFs), a fuzzy inference algorithm is proposed to dynamically adjust the coupling factor between the two DOFs. The two controllers make the payload track a predefined trajectory and be safely transported as fast and accurately as possible with a small swing angle, and then place the payload at the desired position. Simulations are performed with the proposed controllers and the results show their effectiveness.
Unified Processing Structure for Communication and Navigation signals in modems for lightweight satellite stations
Authors: Velez J.C. , Percybrooks W.S. , Antonov-Antipov (R.I.P.) Y.N.
Published: November 2019

The present article shows the design and test of a unified-processing device for detection and demodulation of narrowand broadband communication signals, as well as navigation signals from GLONASS and GPS systems. The specificprocessing for each type of signal is described within the general framework of the proposed device. Performanceindicators, such as symbol error probability (SEP) and energy losses, were computed using simulations of the deviceand the corresponding results are presented for discussion.
Digital Modulator and Demodulator IC for RFID Tag Employing DSSS and Barker Code
Authors: S. Amin M. , I. Reaz M. B. , Jalil J. , F. Rahman L.
Published: November 2019

Radio frequency identification (RFID) is lagging behind because of vendor specific solutions and expensiveimplementation cost. In particular, the reader is the most expensive part. A WiFi compatible tag was proposed to usethe WNIC as an RFID reader. However, no specific modulator or demodulator was suggested. This paper analyzesthe various IEEE 802.11 standards and their modulation and coding techniques keeping the desired properties of anRFID system in consideration. After the analysis, a digital modulator and demodulator for RFID tag in IEEE 802.11protocol employing Direct Sequence Spread-Spectrum (DSSS) and coding is proposed. A MOD-11 synchronouscounter is designed for the 11-bit encoder which generates the desired Barker code. Data are multiplied with thisBarker code to modulate the data, and the received data are multiplied with the Barker code to demodulate them. Theproposed modulator and demodulator are implemented in 0.18μm CMOS technology. The simulation results showthat 1 bit is spread to 11 bits by the modulator and 11-bit received data are demodulated to 1 bit correctly. Theproposed design is simple, resistant to multipath fading and interference and offers the highest distance with thelowest BER for an RFID tag.
An Effective Capacity Estimation Scheme in IEEE802.11-based Ad Hoc Networks
Authors: Zafar H. , Harle D. , Andonovic I. , Hasan L. , Mahmud S.
Published: November 2019

Capacity estimation is a key component of any admission control scheme required to support quality of serviceprovision in mobile ad hoc networks. A range of schemes have been previously proposed to estimate residualcapacity that is derived from window-based measurements of channel estimation. In this paper a simple and improvedmechanism to estimate residual capacity in IEEE802.11-based ad hoc networks is presented. The scheme proposesthe use of a ‘forgiveness’ factor to weight these previous measurements and is shown through simulation-basedevaluation to provide accurate utilizations estimation and improved residual capacity based admission control.
Performance versus Power Analysis for Bioinformatics Sequence Alignment
Authors: Hasan L. , Zafar H.
Published: November 2019

Due to the utilization of abundant hardware resources, power consumption is becoming an important constraint forbioinformatics sequence alignment applications. In this paper, the dynamic power consumption for such applicationsand its impact on performance is evaluated. Additionally, resource utilization and performance results are provided forimplementation with a number of different FPGA platforms. The results obtained using Xilinx ISE tools and Matlabdemonstrate that the performance per unit Watt increases rapidly when increasing the number of ProcessingElements (PEs). Increasing the number of PEs beyond a certain number slows down the performance per unit Wattsignificantly. This behavior is used for approximating the number of PEs that gives an optimized performance per unitWatt.
Phytoplankton Community Structure of Oxbow Lake-Sinau, Kapuas Hulu, West Kalimantan
Authors: Junardi  , Candramila Wolly , Mundiarto Sigit
Published: November 2019

The Sinau Lake is one of the oxbow lakes in Kapuas Hulu, West Kalimantan, which will be used for various purposes, but limnological data is not available. The research objective was to obtain data on the structure of the phytoplankton community and the water quality conditions of Sinau Lake so that it could be used as preliminary data for management and utilization. Samples were taken using purposive sampling method. Water quality is still good with a high plankton diversity index, low dominance and high evenness. Water quality still support the life of aquatic biota or aquaculture.
Az elektronikus aláírás fogalmának megjelenése és változása
Authors: Erdősi Péter Máté
Published: November 2019

Az elektronikus aláírás (electronic signature) fogalmát a jog definiálta elsőként. A fogalom konzisztens elterjedését nem segíti, hogy értelmezése számos átalakuláson ment keresztül, használata során keverednek a digitális aláírás (digital signature), az azonosítás (identification), a hitelesítés (authentication) és a feljogosítás (authorization), valamint a bizalom (trust, reliance), hitelesség, szavahihetőség (trustworthiness) fogalmak. Az elektronikus aláírásnak számos aspektusa jelent meg a jogalkotási és a jogalkalmazási területeken, például használható fokozott biztonságú elektronikus aláírás (advanced electronic signature) vagy minősített elektronikus aláírás (qualified electronic signature) a normál elektronikus aláírásokon túl. A fogalomrendszer bonyolultsága szintén nem kedvez a tömeges használatnak, azonban a fogalmak és követelmények ismerete nélkül nehezen eldönthető kérdés bizonyos esetekben, hogy használható-e az adott szolgáltatás teljes bizonyító erejű magánokirat vagy közokirat létrehozására vagy sem. A tanulmány az elektronikus aláíráshoz kapcsolódó fogalmak kialakulásának historikus vizsgálatát tűzte ki célul, amely révén átfogó kép alakítható ki a napjainkban használatos fogalmak jelentéséről és értelmezéséről. Ez a digitális világban alapvető fontosságúnak tűnik.

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The Emergence and Evolution of the Conceptual Framework of Electronic Signatures

The concept of the electronic signature was used for the first time by legislators. Consistent use of this concept is not helped by the fact that its interpretation has undergone many changes. Related words – digital signature, identification, authentication, authorization, trust, reliance and trustworthiness – are used interchangeably. Many aspects of the electronic signature have appeared in legislation (especially in creating and applying laws), for instance; advanced and qualified signatures may be used in addition to normal signatures. The complexity of this concept is not helped by the wide usage of electronic signatures; however, without knowing concepts and legal consequences, it is hard to decide whether a given service can be used for creating public or private documents with full probative force or not. It is argued that knowing concepts and legal effects of electronic signatures seems to be essential in the digital world.

Keywords: electronic signature, digital signature, full probative force, conceptual framework
ISLAMIC ACCOUNTING: AN OVERVIEW OF IDEOLOGICAL INTERPRETATIONS
Authors: Arwani Agus
Published: November 2019

The paper aims to explore the ideological interpretation of Islamic accounting. It is hoped that the results of various interpretations of Islamic accounting are obtained comprehensively. The research method used is qualitative research. Qualitative research is called Participant-Observation because the researcher himself must be the main instrument in collecting data by directly observing the object being examined While the research approach uses a literature study. The results of this study found that there are several views on the interpretation of Islamic accounting ideology. The fragile philosophical foundation of context knowledge is enough to create counter paradigm rivals as a consequence of the scientific revolution (science revolutions) in the form of an alternative paradigm shift due to the failure of the old paradigm to answer a set of problems. The content of the Islamic substance is liberation, making accounting perceived as a treatise.
PEREMPUAN DAN SAINS: SEKSISME DALAM PENDIDIKAN SAINS DI SEKOLAH ISLAM YOGYAKARTA
Authors: Sa'dan Masthuriyah
Published: November 2019

This study aims to analyse sexism in science education at two Islamic schools in the specialised area of Yogyakarta, namely in MTs Assalafiyyah Mlangi Sleman and Ali Maksum Krapyak Bantul. This study uses an ethnographic approach with data collection techniques of observation, interviews, and surveys. The results showed that science was partial to boys due to gender giving birth to sexism in science education. Discrimination based on sex is not a good thing and is contrary to scientific ethics, namely science for all genders. However, the fact this sexism behaviour also spreads in all lines of people's lives. Without realising the difference in giving and treatment of girls and boys in science is considered as something healthy and so it is. So, to minimise such conditions, we need synergy between all elements of government, school principals, teachers, parents, and society, that girls have the right to master science and technology the same as boys.
Effect of pH Cycling Followed by Simulated Toothbrushing on the Surface Roughness and Bacterial Adhesion of Bulk-fill Composite Resins
Authors: Somacal DC , Manfroi FB , Monteiro MSG , Oliveira SD , Bittencourt HR , Borges GA , Spohr AM
Published: November 2019

The aim was to evaluate, in vitro, quantitatively and qualitatively, the effect of pH cycling and simulated toothbrushing on surface roughness (Ra) and bacterial adhesion (Cn) of bulk-fill composite resins. Thirty specimens of each composite resin, 5 mm wide and 4 mm high, were obtained: group 1 (control): Filtek Z250 (Z250); group 2: Filtek Bulk-Fill (FTK); group 3: Tetric N-Ceram Bulk-Fill (TTC); and group 4: Aura Bulk-Fill (AUR). After 24 hours, the specimens were polished and then alternated with demineralization/remineralization solutions for 15 cycles of 24 hours each at 37°C. Then the specimens were submitted to simulated toothbrushing. The Ra and Cn measurements were quantitatively analyzed in three stages: after polishing (Ra0 and Cn0), after pH cycling (Ra1 and Cn1), and after simulated toothbrushing (Ra2 and Cn2). The Ra values were submitted to two-way analysis of variance, followed by the Tukey test (α=0.05). The Kruskal-Wallis test, followed by multiple comparisons, was applied for Cn analysis. Surface topography and bacterial adhesion were observed by scanning electron microscopy (SEM). Z250, FTK, and TTC showed no significant change in Ra regardless of the treatment performed; AUR obtained increased Ra at Ra2 (p<0.05). FTK differed from the others at Cn0 and Cn1 (p<0.05). At Cn2, there was no difference among the composite resins. SEM images showed the exposure of fillers and microcavities at Ra1 and Ra2. There was greater bacterial adhesion at Cn1 for Z250 and FTK. It was concluded that the pH cycling caused surface degradation of all composite resins, which was potentiated by simulated toothbrushing. However, only AUR presented an increased Ra. Bacterial adhesion occurred on all composite resins after pH cycling; however, after simulated toothbrushing, adhesion of dispersed bacteria was similar for all the composite resin groups.
PENGARUH MODEL PROBLEM BASED LEARNING BERBASIS LINGKUNGAN TERHADAP HASIL BELAJAR SISWA KELAS X AP PADA MATA AJAR SANITASI, HYGIENE DAN KESELAMATAN KERJA DI SMK PARIWISATA TRIATMA JAYA SINGARAJA TAHUN AJARAN 2018/2019
Authors: Yulianitias Yulianitias , Marsiti Cokorda Istri Raka , Masdarini Luh
Published: November 2019

ABSTRAK Tujuan dari penelitian ini adalah untuk mengetahui perbedaan dari penggunaan model Problem Based Learning berbasis lingkungan terhadap hasil belajar siswa kelas X-AP mata ajar Sanitasi, Hygiene dan Keselamatan kerja di SMK Pariwisata Triatma Jaya Singaraja Tahun Ajaran 2018/2019. Desain penelitian yang digunakan adalah Non equivalent Only Control Group Design. Objek dalam penelitian ini terdiri dari dua kelas sampel, yaitu kelas eksperimen dan kelas kontrol. Metode pemilihan sampel penelitian adalah dengan teknik random sampling. Proses pengumpulan data menggunakan instrumen tes untuk mengetahui hasil belajar siswa, kemudian melakukan pengujian hipotesis dengan menggunakan teknik uji-t. Berdasarkan hasil analisis data, diperoleh thitung 7,641 dan ttabel (pada taraf signifikansi 5%) = 3,460. Hal ini berarti bahwa thitung> ttabel, sehingga dapat diinterpretasikan bahwa terdapat pengaruh yang signifikan terhadap hasil belajar siswa X AP Di SMK Pariwisata Triatma Jaya Singaraja antara kelompok siswa yang dibelajarkan dengan Problem Based Learning berbasis lingkungan lebih tinggi dibandingkan kelompok siswa yang dibelajarkan dengan metode konvensional. Dilihat dari hasil perhitungan rata-rata hasil belajar Sanitasi, Hygiene dan Keselamatan kerja kelompok eksperimen adalah 81 lebih besar dari rata-rata hasil belajar Sanitasi, Hygiene dan Keselamatan kerja kelompok kontrol yaitu 76 Kata kunci: Hasil belajar Sanitasi, Hygiene dan Keselamatan Kerja, Model Problem Based Learning (PBL) Berbasis Lingkungan ABSTRACT The study aimed at finding out the difference of implementation of problem based learning model with environmental basis towards the achievement of class XAP students on the subjects of sanitation, hygiene, and workplace safety at SMK Pariwisata Triatma Jaya Singaraja on the academic year 2018/2019. The research was designed with non equivalent only group control. The objects were two classes of samples, namely controlled and sample classes. Random sampling method was apllied to determine the sample of the research. The data were gathered by using test to find out the achievement of the students , then examining the hypothesis was done by implementing t-examiner technique. The results show that tvalue is 7,641 and ttable (at level of significance 5%) = 3,460. It means that tvalue> ttable. It can be interpreted that there is a significant effect towards the students’ahievement of class X AP at SMK Pariwisata Triatma Jaya Singaraja. The group of students that were treated with Problem Based Learning with the environmental basis got the mean score 81 for sanitation, hygiene, and workplace safety, it is higher than those who were treated with conventional method (controlled group).Key words : achievement, sanitation, hygiene, and workplace safety Model
Potensi Wisata Alam Air Terjun Kuning Sebagai Daya Tarik Wisata Alam Di Kawasan Desa Taman Bali, Kecamatan Bangli, Kabupaten Bangli
Authors: Oktaviantari Ni Putu Eka , Damiati Damiati , Suriani Ni Made
Published: November 2019

ABSTRAK Tujuan dari penelitian ini adalah untuk mengetahui potensi objek wisata alam Air Terjun Kuning sebagai daya tarik wisata alam di kawasan Desa Taman Bali Kecamatan Bangli Kabupaten Bangli. Dalam penelitian ini, peneliti menggunakan tiga metode yaitu metode wawancara, observasi dan analisis SWOT. Hasil penelitian ini yaitu (1) kondisi fisik Air Terjun Kuning memiliki ketinggian 25 meter dengan kedalaman 3 meter, dan tempat peristirahatan seluas 1 are, (2) keadaan lingkungan disekitar air terjun masih sangat alami, (3) Keunikan Air Terjun Kuning memiliki tempat sumber mata air minum dan melukad yang disakralkan, yang digunakan sebagai tempat melukad, (4) Kegiatan yang dapat dilakukan di Air Terjun Kuning yaitu jasuzz dan pembuatan vlog, (5) Fasilitas penunjang Air Terjun Kuning yaitu pos informasi, tempat parkir, restaurant. Berdasarkan hasil penelitian diatas dapat disimpulkan bahwa Air Terjun Kuning memiliki potensi sebagai daya tarik wisata alam. Kata Kunci : Air Terjun Kuning, Potensi Wisata Air Terjun Kuning, Daya Tarik Wisata Alam ABSTRACT The purpose of this study was to find out the potential of the Yellow Waterfall as a natural tourist attraction in the area of Taman Bali Village, Bangli District, Bangli Regency. In this study, researchers used three methods, namely the method of interview, observation and SWOT analysis. The results of this study are (1) the physical condition of Yellow Waterfall has a height of 25 meters with a depth of 3 meters, and a resort area of 1 acre, (2) the environment around the waterfall is still very natural, (3) The uniqueness of Yellow Waterfall has its source sacred drinking water and burdens, which are used as a place of burial, (4) Activities that can be done in Waterfall Kuning are jasuzz and vlog making, (5) Yellow Waterfall supporting facilities, namely information posts, parking lots, restaurants. Based on the results of the above research it can be concluded that Yellow Waterfall has potential as a natural tourist attraction. Keywords: Yellow Waterfall, Yellow Waterfall Tourism Potential, Nature Tourism Attraction