bluuebunny/crossref_metadata_2025 huggingface dataset:
Adaptive Neuro Fuzzy Inference System control of active suspension system with actuator dynamics
Authors: Senthil Kumar P. , Sivakumar K. , Kanagarajan R. , Kuberan S.
Published: February 2018

A hybrid intelligent control technique based on combination of neural network and fuzzy logic will be proposed for hydraulic actuated active suspension system. A half car model will be used for design of Adaptive Neuro Fuzzy Inference System (ANFIS) controller for hydraulic actuated active suspension. The nonlinear behavior of hydraulic system and uncertain parameters in active suspension has increased the difficulty of creating mathematical model for active suspension system. The performance of most of the classical controller depends on nature of mathematical model of system. Hence it is very difficult to create classical controller without mathematical model of a system. Fuzzy logic controller has ability to predict the behavior of system without the need of mathematical model of a system. In this paper, ANFIS controller proposed for active suspension due to its ability to handle actuator dynamics and parameter uncertainty in hydraulic actuator. The simulation carried out for sinusoidal road profile in order to measure the performance of proposed controller. The result of simulation indicates performance of the ANFIS controller for active suspension with actuator dynamics.
Outer characteristic simulation and performance analysis of variable shock absorber
Authors: Li Shisheng , Yuan Qiong , Xu Zhongming , Wu Cunxue
Published: February 2018

In this study, a variable shock absorber (VSA) for semi-active suspension is developed, the structure and operation principle of the VSA is illustrated. Based on the theory of hydraulics and elasticity, the ways of calculating for the embranchment flow rate and the throttle pressure difference on the series-parallel complex pipe line (SPCPL) are deduced and employed, and the detailed mathematical model of the VSA is established by using the differential equation for annular laminar deformation under uniform load (ALDUUL). The MATLAB/Simulink software is used to simulate the detailed model, and the calculated results agree well with the experimental results. In particular, the influence rules of the bypass groove diameter of the VSA on its damping is analyzed through this model, and the results obtained can technically support the design and performance prediction of the VSA to a certain degree.
Research and application of Volterra series theory in rolling bearing fault state feature extraction
Authors: Wang Haitao , Kang Zhenya , Shi Lichen , Wang Kun , Zhang Xiao
Published: February 2018

Due to the generally strong non-linear characteristics of bearing failure, leading to overall mechanical system failure, fault state feature extraction is difficult. In this paper, a fault feature extraction method based on the Volterra series kernel under multi-pulse excitation is proposed. To avoid reliance on simplified models based on traditional mechanics, a nonlinear Volterra series model was constructed by introducing the input and output signals of the system, and using a low-order Volterra series kernel from the time domain and frequency domain, which was then solved using a multi-pulse excitation method. Furthermore, the state of the rolling bearing was determined using different characteristics of the corresponding generalized frequency response, and the current fault stage was inferred. The rolling bearing failure was validated experimentally, and it was shown that the Volterra series model can be more easily used to extract fault characteristics and trends of a rolling bearing in comparison to the traditional wavelet algorithm, therefore serving as a better method for fault prediction.
Structural health monitoring of 3D frame structures using finite element modal analysis and genetic algorithm
Authors: Tiachacht S. , Bouazzouni A. , Khatir S. , Behtani A. , Zhou Y.-L.-M. , Wahab M. Abdel
Published: February 2018

In this paper, we present a new application based on Genetic Algorithm (GA) to detect damage in 3D frame structures. Finite Element Method (FEM) is used to build models for intact and damaged structures. The identification of damage is formulated as an optimization problem using GA and the changes in natural frequencies. A 3D frame structure with two floor is used, as a numerical example, for damage identification. The proposed method is then applied to identify some removed elements. The results obtained using FEM is validated using experimental benchmark test of a 3D frame structure with eight floors. The results show that the proposed technique gives good damage identification compared with literature [1]. Furthermore, there is no error recorded in the prediction of location, however a small error is recorded in detecting damage severity. It is concluded that GA is an efficient tool to quantify single and multiple damages with high precision in 3D frame structures.
A study of a nonlinear magnetic vibration isolator with quasi-zero-stiffness
Authors: Su Pan , Wu Jiechang , Liu Shuyong , Fang Yuan
Published: February 2018

A novel quasi-zero stiffness nonlinear magnetic isolator is designed by using magnetic springs in parallel with linear positive stiffness spring. Through the static analysis, the mathematical expressions of force-displacement-current and stiffness-displacement-current of the system are established, and the necessary conditions for the normal function and geometric parameters of the system are obtained. The nonlinear dynamic equations of the system under external excitation force are established. The amplitude and frequency characteristics of the system are deduced by harmonic balance method. The influence of system parameters and external excitation amplitude on the dynamic characteristics of the system is analyzed. Results showed that the vibration of the system can be controlled by controlling the electromagnet current or increasing the damping coefficient while the external excitation amplitude is kept in a certain of range. The researches provided a theoretical guidance for the design and application of the new quasi-zero stiffness nonlinear magnetic isolation system.
Study on the dynamics of two-degree-of-freedom system with variable stiffness magnetic isolator
Authors: Su Pan , Wu Jiechang , Liu Shuyong , Jiang Jian
Published: February 2018

This paper presents a novel variable stiffness isolator designed by magnetic springs in parallel with linear positive stiffness spring. Firstly, the two-degree-of-freedom vibration system model with variable stiffness magnetic isolator is established. The amplitude frequency characteristic equation of the system is derived based on the multi-harmonic method, and the corresponding curve of the relationship between the amplitude and frequency is given. The influence of the current on the curve is researched. Results showed that there are two pseudo-resonant peaks in the amplitude–frequency curve, and one is in the low frequency band, the other exists in higher frequency band. The first peak does not exhibit the frequency shift, but the second one bends to the natural frequency obviously. With the increasing of the current, the peaks decrease and the backbone curve changes greatly for the second resonant crest. The Lyapunov exponent curve around the resonant frequency is calculated. It is shown that there is chaotic parameter region for the system, and chaos can be controlled with the variable stiffness magnetic vibration isolator according to this research, which is beneficial to the design of nonlinear vibration isolation system.
The undamped control for PWM rectifier based on LCL filter
Authors: Fan Bo , Song Lu , Song Shuzhong , Fu Jiangtao
Published: February 2018

LCL filter is applied in PWM rectifier with the better filtering effect. Its inductor also plays a role in inhibiting the current impact, which not only has a good dynamic performance, but also reduces the system cost. However, LCL filter can cause resonance in certain frequency that affects system performance, as well as the parameters of LCL filter are hard to design. With analysis on the theory and characters of the fixed switching frequency control strategy, an undamped control strategy of three-phase voltage PWM rectifier based on LCL filtering is proposed for the resonance of LCL filter. The delay of system and the fixed switching frequency are used to control the damp. PI regulator’s sampling time is adjusted to achieve the system stability. The structure of system is optimized by the design of simplified capacitance sensor. The simulation results show that this method has better dynamic performance, the current harmonic of grid side has reduced sharply, and the resonance of LCL filter has been inhibited effectively.
A method for shifting natural frequencies of a dynamic system to desired values with concentrated mass modifications
Authors: Çakar Orhan
Published: February 2018

In this study, shifting a certain number of natural frequencies of a dynamic system to the desired values with the concentrated mass modifications is considered. A new method is proposed in order to determine the necessary mass modifications. The method proposed is based on the Sherman-Morrison formula and uses the receptances that are related to the modification coordinates of the original system. The system is sequentially modified at the predefined locations by a number of unknown masses which equal the number of frequencies that will be shifted. The method yields a set of nonlinear equations which equal the number of shifting frequencies, then the necessary masses are estimated by solving these equations numerically. The efficiency of the proposed method is shown by various numerical and experimental applications. It is shown that the method is very effective and can be used for real applications.
Bifurcation and chaotic behaviors of 4-UPS-RPS high-speed parallel mechanism
Authors: Chen Xiulong , Jia Yonghao
Published: February 2018

In order to grasp the nonlinear characteristics of high-speed spatial parallel mechanism, the bifurcation and chaotic behaviors of 4-UPS-RPS mechanism are analyzed. Firstly, the nonlinear elastic dynamic model of the mechanism is established by using the Lagrange equation and the finite element method. Then the effects of parameters including driving angular velocity, the radius of motion trajectory, the material of driving limbs, the diameter of driving limbs, and the mass of moving platform, on the bifurcation and chaotic behaviors of high-speed spatial parallel mechanism are studied. The results show that the above parameters all have a certain influence on nonlinear characteristics of the 4-UPS-RPS high-speed spatial parallel mechanism. The research can provide important theoretical basis for the further research on the non-linear dynamics of spatial parallel mechanism.
In-plane vibration analysis of heavy-loaded radial tire utilizing the rigid-elastic coupling tire model with normal damping
Authors: Liu Zhihao , Gao Qinhe
Published: February 2018

Theoretical modeling, parameters identification and vibration characteristic of heavy-loaded radial tire is investigated with rigid-elastic coupling model with normal damping. The normal damping, including structural damping of flexible carcass and proportion damping of distributed sidewall element is added to enrich the flexible beam on modified elastic foundation tire model. The rigid-elastic coupling tire model with normal damping is investigated and derived with finite difference method. The mass, stiffness and damping matrixes of the proposed tire model are analytically related with the structural and geometrical parameters of heavy-loaded radial tire. Taking the error between the analytical and experimental transfer function as the object value, Genetic Algorithm (GA) is utilized to identify the damping coefficients of flexible carcass and distributed sidewall element. The influence of modal order and tire damping parameters on the in-plane transfer function is discussed. The theoretical and experimental results show that the rigid-elastic coupling tire model with normal damping can achieve the sectional feature of in-plane transfer function resulting from the coupling characteristic between the flexible carcass and distributed sidewall element within the frequency band of 300 Hz.
A PVC-pipe device as a sanitary barrier for improving rainwater quality for drinking purposes in the Brazilian semiarid region
Authors: de Carvalho José Roberto Santo , Luz Julio , Santos Sylvana Melo , Gavazza Sávia
Published: February 2018

We evaluate the behavior of a device designed to automatically divert and store the first flush of harvested rainwater in cisterns. The first phase (PI) was conducted with artificial precipitation in an experimental installation seeking to identify how many millimeters of rainwater should be diverted to preserve the rainwater quality. In the second phase (PII), we designed a PVC-pipe device to store the first millimeter of rainwater, and tested it in field (a rural area in Brazil) during two real rainfall events. In the third phase (PIII), the device and a hand pump were assayed for two years using eight cisterns in a rural area where people drink the rainwater. PI results indicated that the most significant pollution of the rainwater is flushed with the first millimeter of rain, and diversion promoted the removal of 98% and 100% of the total coliforms and Escherichia coli, respectively. The bacteriological behavior was maintained in the subsequent phases. The device was able to preserve the quality of the rainwater most of the time, satisfying drinking requirements for the parameters of turbidity and color. The satisfactory performance of the device was confirmed in the field, behaving as a sanitary barrier for rainwater quality protection.
Kinetics of Decomposition Reactions of Acetic Acid Using DFT Approach
Authors: Verma Anand Mohan , Kishore Nanda
Published: February 2018

Object:

Excessive amount of oxygen content in unprocessed bio-oil deteriorates the quality of bio-oil which cannot be used in transportation vehicles without upgrading. Acetic acid (CH3COOH) is a vital component of ‘acids’ catalogue of unprocessed bio-oil produced from thermochemical conversions of most of biomass feedstocks such as switchgrass, alfalfa, etc. In this study, the decomposition reactions of acetic acid are carried out by two reaction pathways,i.e., decarboxylation and dehydration reactions. In addition, the reaction rates of decomposition are analysed in a wide range of temperatures,i.e., 298-900 K and at atmospheric pressure.

Method:

All quantum chemical calculations are performed in the gas phase using two DFT functionals, B3LYP and M06-2X, with 6-31g(d) basis set. The dehydration reaction of acetic acid proceeds directly from ground state structure of acetic acid, whereas, decarboxylation reaction forms an unstable intermediate of acetic acid to initiate the proton migration. Barrier height and kinetics study for both reactions and theories are different and illustrated in the reaction pathway and rate profiles, respectively. Furthermore, both levels of theories offer similar structural configurations but they differ slightly in energetics.

Conclusion:

The reaction kinetics of both reactions is linearly fitted and the Arrhenius equations corresponding to each decomposition mechanism are generated by fitting the data from line equation.
Formulizing the Fuzzy Rule for Takagi-Sugeno Model in Network Traffic Control
Authors: Alhihi Mohammad , Khosravi Mohammad Reza
Published: February 2018

Background:

Nowadays, fuzzy logic theory is a popular approach to control network variables in engineering problems such as computer and communication networking. In this research, we formulize a new fuzzy logic-based rule for an important engineering application,i.e., traffic control of communication networks.

Method:

In this regard, we propose a new formulization based on a well-known model of traffic control in the networks entitled Takagi-Sugeno. Towards this modeling, we use a typical Fuzzy Neural Network (FNN) with an optimizer based on Genetic Algorithm (GA).

Conclusion:

The simulation results of our new model clearly prove that the proposed model and its formulation are approximately according to a theoretically consumed model for the problem. In details, we suppose two arbitrary examples for the problem which have two different assumed solutions, and then, we try to resolve the problem for both conditions based on the model in which the simulations show relatively similar results for both simulation-based and theoretical results in both examples.
Design of SMA-Brace Devices for the Seismic Retrofit of Steel CBF
Authors: Grande Ernesto , Ruotolo Giampietro
Published: February 2018

Introduction:

Retrofit interventions are often performed by introducing in structures dissipative devices able to improve the global seismic response particularly in terms of energy dissipation capacity. In the case of Concentric Braced Steel Frames (CBF), these devices are generally introduced in the form of brace elements made of different materials and based on different dissipation mechanisms. Their design is strictly related to both the characteristics of the selected device and, also, to the own peculiarities of the structural system involved in the retrofit intervention.

Methods:

The paper presents a simple design approach for the seismic retrofit of non-ductile CBF through the use of Shape Memory Alloys (SMA) brace devices. The approach merges the potentialities of SMA materials and the main peculiarities of the truss-resistant mechanism of CBFs throughout a procedure based on a preliminary phase of assessment, an intermediate phase of requirements evaluation and a final phase of design of the retrofit intervention.

Results and Conclusion:

After a detailed explanation of the proposed approach, the results derived from non-linear time-history analyses developed with reference to three and five-story CBFs are presented in the paper.
Evaluating Benin EFL Learners Writing Composition during Final Exam
Authors: Hounhanou Arlette Viviane
Published: February 2018

Evaluating EFL learners in Benin, specifically, the case of the upper-sixth grade requires a certain number of competencies. Writing is not an easy task for learners particularly when they do not have the appropriate vocabulary. The present article aims at analyzing the way students’ papers were corrected; attention was focused on learners of the upper sixth grade during the school year and their final exam period. The researcher establishes a comparison between the two types of correcting learners ‘writing, how students’ were evaluated, and how feedback was turned in class. The evaluation took into account the writing composition only more specifically how EFL teachers evaluate learners for the final exam, how did it occur in class during the year and the conditions of these types of evaluation. A total number of 59 EFL teachers took part in this study.  Among them, 50 EFL teachers were involved regarding the national exam and 09 other EFL teachers participated in this study in their classroom and out of exam context. The findings of this research indicate that there is a significant difference between the way the correction is undertaken in class and during the final. The results will then enable curriculum specialists in Benin to reexamine the concept of evaluation and more importantly the feedback on writing in class, and specifically for the national exam.
Pengembangan pembelajaran teknik dasar bulu tangkis berbasis multimedia pada atlet usia 11 dan 12 tahun
Authors: Putra Ghazali Indra , Sugiyanto FX.
Published: February 2018

Penelitian ini bertujuan untuk menghasilkan media pembelajaran teknik dasar bulu tangkis berbasis multimedia. Penelitian pengembangan ini dilakukan dengan langkah-langkah sebagai berikut: (1) tahap studi pendahuluan, (2) validasi ahli, (3) uji coba lapangan, dan (4) pembuatan produk akhir. Data dikumpulkan menggunakan instrumen: (1) validasi produk awal, (2) angket observasi untuk pelatih dan ahli materi, dan (3) lembar observasi respons atlet. Penelitian ini menghasilkan media untuk pembelajaran teknik dasar bulu tangkis berbasis multimedia yang dikemas dalam CD dan disertakan buku petunjuk penggunaan. Teknik dasar bulu tangkis tersebut, yaitu: (1) bentuk-bentuk pegangan raket, (2) macam-macam servis, (3) macam-macam pukulan dari atas, dan (4) macam-macam pukulan dari bawah.Kata Kunci: pengembangan, teknik dasar bulu tangkis, multimedia, atlet usia 11 dan 12 tahun DEVELOPMENT FOR LEARNING THE BASIC TECHNIQUES OF BADMINTON BASED ON MULTIMEDIA TO ATHLETES AGED OF 11 AND 12 AbstractThis research aimed to produce a media for learning the basic techniques of badminton based multimedia. The research and development was conducted by the following steps: (1) the introduction study phase, (2) validation of experts, (3) testing product, and, (4) creating the final product. Instruments for collecting the data were: (1) the first product validation, (2) the questionnaire observation for coach and expert, and (3) observation sheet response for athletes. This research produced a media for learning the basic technique of badminton based on multimedia that was packaged in a CD and user’s guide included. The basic techniques are: (1) the forms of racket grip, (2) services, (3) a variety of overhead stroke, and (4) a variety of underhand stroke.Keywords: development, the basic techniques of badminton, multimedia, athletes at the age of 11 and 12 years old.
Penyusunan tes fisik atlet pencak silat dewasa kategori tanding
Authors: Kuswanto Cahniyo Wijaya
Published: February 2018

Penelitian ini bertujuan untuk menghasilkan sebuah pedoman tes fisik atlet pencak silat dewasa kategori tanding yang valid dan reliabel yang dapat digunakan untuk mengukur kondisi fisik atlet pencak silat dewasa kategori tanding. Jenis penelitian ini menggunakan metode penelitian dan pengembangan (Research and Development). Teknik Analisis data menggunakan penyusunan skor baku dengan rerata dan simpangan baku skor T yang digolongkan menjadi lima norma berdasar pada distribusi gejala normal, yaitu sangat baik, baik, sedang, kurang, sangat kurang. Data yang diperoleh tiap-tiap jenis tes merupakan data kasar dari hasil tiap tes yang di capai atlet. Selanjutnya hasil data kasar tersebut diubah dengan rumus T skor. Hasil penelitian ini diperoleh 9 (Sembilan) jenis tes fisik atlet pencak silat dewasa kategori tanding, antara lain: (1) Fleksibilitas (Side Splite), (2) Kecepatan (Sprint 40 Meter), (3) Power Lengan (Push Up 30 Detik), (4) Kekuatan Perut (Sit Up), (5) Kekuatan Punggung (Back Up), (6) Power Tungkai (Standing Triple Jump), (7) Kelincahan (Shuttle Run), (8) Daya tahan anaerobik (Sprint 300 meter), dan (9) Daya tahan aerobik (Bleep Tes). Tes ini dinyatakan valid dan menunjukkan koefisien reliabilitas putra dan putri > 0,5.Kata Kunci: tes pengukuran, pencak silat, kondisi fisik. THE CONSTRUCTION OF A PHYSICAL TEST OF ADULT FIGHTING CATEGORY PENCAK SILAT ATHLETEAbstractThis research was aimed to produce a valid and reliable guide book for a physical test for adult pencak silat athlete in fighting category. This guide book was supposed to measure the physical condition of adult pencak silat athlete at the fighting category. This research was using research and development method. The data analysis techniques used in this research were the construction of standard score by the mean and standard deviation of T score. The T score was classified into five norms based on normal indication distribution, namely very good, good, moderate, poor, and very poor. The data taken from each test was the raw data from the result of each test achieved by the athletes. Then, that result was changed into T-score. This research reveals nine types of physical test for adult pencak silat athlete at the fighting category. They are: (1) Flexibility (Side Splite), (2) Speed (Sprint 40 meters), (3) Arm Power (30 seconds Push Up), (4) Abdominal Strength (Sit Up), (5) Back Strength (Back Up), (6) Leg Power (Standing Triple Jump), (7) Agility (Shuttle Run), (8) Anaerobic Endurance (300 meters Sprint), and (9) Aerobic Endurance (Bleep Test). This test is valid and indicates reliability coefficient of male and female > 0.5.Keywords: measurement test, pencak silat, physical condition.
Evaluasi program pembinaan prestasi cabang olahraga bola voli pantai
Authors: Irmansyah Johan
Published: February 2018

Penelitian ini bertujuan untuk mengevaluasi pelaksanaan program pembinaan prestasi cabang olahraga bola voli pantai di provinsi Nusa Tenggara Barat (NTB) dan Daerah Istimewa Yogyakarta (DIY) dengan menggunakan model evaluasi CIPP (Contexs, Input, Process, Product). Penelitian ini merupakan penelitian evaluasi. Data dikumpulkan melalui observasi, wawancara, angket, dan dokumentasi. Teknik analisis data yang digunakan dalam penelitian ini yaitu análisis deskriptif kuantitatif dan kualitatif. Hasil penelitian menunjukkan bahwa secara keseluruhan hasil evaluasi program pembinaan prestasi cabang olahraga bola voli pantai di Provinsi NTB masih kurang baik dan di DIY sudah berjalan dengan baik. Pada evaluasi program pembinaan prestasi di NTB, dari segi contexs sudah berjalan dengan baik. Dari segi input masih kurang baik. Dari segi process masih sangat kurang. Dari segi product secara garis besar prestasi yang diraih sudah baik, dapat dilihat dari hasil dokumentasi prestasi-prestasi yang pernah diraih oleh atlet-atlet NTB. Sedangkan di DIY, evaluasi program pembinaan prestasi dari segi contexs sudah berjalan dengan baik. Dari segi input sudah berjalan dengan baik. Dari segi process sudah berjalan dengan sangat baik. Dari segi product secara garis besar prestasi yang diraih sudah baik, dapat dilihat dari hasil dokumentasi prestasi-prestasi yang pernah diraih atlet-atlet DIY.Kata Kunci: evaluasi program, pembinaan prestasi, dan bola voli pantai An Evaluation of Development Program of Beach Volleyball AbstractThis study was aimed to evaluate the implementation of sport development program of beach volleyball in the province of West Nusa Tenggara (NTB) and Special Region of Yogyakarta (DIY) by using the CIPP evaluation model (Contexs, Input, Process, Product). This study was an evaluation. The data were collected through observation, interviews, questionnaires, and documentation. Data analysis techniques used in this research was descriptive quantitative and qualitative analysis. The results show that the overall results of the evaluation of the achievements of sports coaching program of beach volleyball in the province of NTB are still not good and in DIY are good. At the evaluation of the coaching program achievement in the province of NTB, in terms of contexs, it has been running well. In terms of the input, it is still not good. In terms of process, it is still very poor. In terms of product in general, the achievement has been good, it can be seen from the accomplishment documentation that has ever been achieved by athletes of NTB. In DIY, the evaluation of the coaching program achievements in terms of contexs has been running well. In terms of input, it has been running well. In terms of process it is already under way with very good. In terms of product in general, the achievement has been good, it can be seen from the accomplishment documentation that has ever been achieved by DIY athletes.Keywords: program evaluation, coaching achievement, and beach volleyball
Pengembangan model pembelajaran atletik nomor lempar untuk anak tunagrahita ringan
Authors: Lufthansa Luthfie
Published: February 2018

Penelitian ini bertujuan menghasilkan model pembelajaran atletik nomor lempar untuk anak tunagrahita ringan. Penelitian pengembangan ini dilakukan dengan langkah-langkah sebagai berikut: (1) pengumpulan informasi di lapangan, (2) analisis terhadap informasi, (3) pengembangan produk awal, (4) validasi ahli dan revisi, (5) uji coba lapangan kelompok kecil dan revisi, (6) uji coba lapangan kelompok besar dan revisi, dan (7) pembuatan produk final. Instrumen pengumpulan data yang digunakan yaitu: (1) pedoman wawancara, (2) skala nilai, dan (3) pedoman observasi. Teknik analisis data yang dilakukan yaitu teknik analisis deskriptif kuantitatif dan analisis deskriptif kualitatif. Penelitian menghasilkan buku panduan pembelajaran atletik nomor lempar untuk anak tunagrahita ringan yang berisikan delapan model, yaitu (1) model pembelajaran netting menolak, (2) model pembelajaran menolak peluru, (3) model pembelajaran mengayun gelang warna melewati net, (4) model pembelajaran mengayun piring ufo ke bulan, (5) model pembelajaran melempar bola berekor dengan sasaran dengan sasaran simpai yang digantung, (6) model pembelajaran melempar roket ke bintang, (7) model pembelajaran bermain netting melontar, dan (8) model pembelajaran melontar komet ke matahari.Kata Kunci: anak tunagrahita ringan, pembelajaran atletik, nomor lempar, pengembangan Developing a Learning Model of Throwing Games in Athletics for Slightly Mentally-Retarded Children AbstractThis study aims to develop a learning model of throwing games in athletics for slightly mentally retarded children. The research and development study was conducted in the research and development steps as follows: (1) collecting information in the field, (2) analyzing the information, (3) developing the preliminary product, (4) conducting expert validation and revision, (5) conducting a small-group field tryout and revision, (6) conducting a large-group field tryout and revision, and (7) making the final product. The data collection instruments included: (1) an interview guideline, (2) a grade scale, and (3) an observation guideline. The data were analyzed by means of quantitative and qualitative descriptive techniques. The study produces a guidebook for the learning of throwing games in athletics for slightly mentally retarded children consisting of eight models, i.e.: (1) a learning model of the push netting, (2) a learning model of the shot put, (3) a learning model of swinging color rings over a net, (4) a learning model of swinging an UFO plate to the moon, (5) a learning model of throwing a tailed ball at a hanging hoop target, (6) a learning model of throwing a rocket to a star, (7) a learning of the throwing netting game, and (8) a learning model of throwing a comet to the sun.Keywords: slightly mentally retarded children, athletics learning, development
Pembelajaran keliling lingkaran menggunakan konteks gelas
Authors: Nurdiansyah Nurdiansyah , Prahmana Rully Charitas Indra
Published: February 2018

Penelitian ini bertujuan untuk mengetahui peran konteks gelas dalam mendukung pembelajaran konsep keliling lingkaran dan mengetahui respon peserta didik terhadap pembelajaran matematika menggunakan pendekatan Realistic Mathematics Education (RME). Penelitian ini dilaksanakan di Sekolah Menengah Pertama (SMP) Surya Bangsa, Tangerang. Subjek penelitian ini adalah peserta didik kelas VIII.A Tahun Ajaran 2015/2016 semester II dengan jumlah peserta didik sebanyak 13 orang. Instrumen penelitian yang digunakan dalam penelitian ini terdiri atas Lembar Aktivitas Peserta Didik (LAPD), Soal Evaluasi, Lembar Observasi Guru, Panduan Wawancara dan Angket Respon Peserta Didik. Teknik pengumpulan data pada penelitian ini meliputi rekaman video, pengisian dokumen penelitian, observasi dan wawancara. Analisis data dilakukan menggunakan model Miles & Huberman (1994) yang terdiri atas reduksi data, penyajian data, penyimpulan dan verifikasi. Pembelajaran dalam penelitian ini menggunakan konteks gelas berdasarkan karakteristik pendekatan RME. Hasil dari penelitian ini menunjukkan bahwa konteks gelas berperan penting dalam mendukung pembelajaran konsep keliling lingkaran. Selain itu, peserta didik memiliki respon yang positif terhadap pembelajaran matematika yang diberikan menggunakan pendekatan RME. Learning Circumference using the Context of Glass AbstractThis research aims to find out the role of glass as a context in supporting the concepts of the circumference of the circle and to know the response of learners in learning mathematics using Realistic Mathematics Education (RME) approach. This research conducted at Surya Bangsa Junior High School, Tangerang. The subjects of this study are students of class VIII.A in the academic year 2015/2016 semester II with the number of learners as many as 13 people. The research instruments used in this study consist of Student Activity Sheet (SAS), Evaluation Test, Observation Sheet, Interview Guide, and Questionnaire. Data collection techniques in this study include video recording, completion of research documents, observation, and interviews. Data analysis technique using Miles & Huberman (1994) model consisting of reduction data, presenting data, conclusion and verification. The learning in this study uses the context of glass based on the characteristics of the RME approach. The results of this study indicate that the context of glass plays a significant role in supporting learning the concept of the circumference of the circle. Also, learners have a positive response in learning mathematics provided using the RME approach.
Attitudes and Preferences Toward a Hypothetical Trial of an Internet-Administered Psychological Intervention for Parents of Children Treated for Cancer: Web-Based Survey (Preprint)
Authors: Woodford Joanne , Wikman Anna , Einhorn Kim , Cernvall Martin , Grönqvist Helena , Romppala Amanda , von Essen Louise
Published: February 2018

BACKGROUND

Clinical trials are often challenged with issues of recruitment and retention. Little is known concerning general attitudes and preferences toward trial design and willingness to participate among parents of children treated for cancer. Furthermore, willingness to participate in internet-administered psychological interventions remains unexplored. In this study, we examined attitudes and preferences of the population regarding study procedures for a hypothetical trial of an internet-administered psychological intervention. In addition, differences in the response rate between modes of study invitation and willingness to engage in internet-administered interventions were examined.

OBJECTIVE

The primary objective of this study was to examine attitudes and preferences toward participating in an internet-administrated psychological intervention. The secondary objective was to examine the response rates and help-seeking behavior among parents of children treated for cancer.

METHODS

A cross-sectional, Web-based survey was conducted with parents of children who had completed cancer treatment. This Web-based survey examined self-reported emotional distress, prior help-seeking and receipt of psychological support, past research participation, attitudes toward research, preferences concerning recruitment procedures, and attitudes toward different types of trial design.

RESULTS

Of all the parents invited, 32.0% (112/350) completed the survey, with no difference in response rate between modes of study invitation (χ21=0.6, P=.45). The majority (80/112, 71.4%) of parents responded that they had experienced past emotional distress. Responses indicated high (56/112, 50.0%) or somewhat high trust in research (51/112, 45.5%), and the majority of parents would accept, or maybe accept, internet-administered psychological support if offered (83/112, 74.1%). In addition, responses showed a preference for postal study invitation letters (86/112, 76.8%), sent by a researcher (84/112, 75.0%) with additional study information provided on the Web via text (81/112, 72.3%) and video (66/112, 58.9%). Overall, parents responded that trials utilizing a waiting list control, active alternative treatment control, or a patient-preference design were acceptable.

CONCLUSIONS

Parents of children treated for cancer appear willing to participate in trials examining internet-administered psychological support. Findings of this study will inform the design of a feasibility trial examining internet-administered psychological support for the population.
Ecological evolutionary developmental biology in dialogue with agroecology: The Milpa as model system
Authors: Benitez Mariana
Published: February 2018

The fields of agroecology and ecological evolutionary developmental biology  (eco-evo-devo) have been performing somewhat parallel efforts of synthesis. On the one hand, agroecology has incorporated knowledge from different disciplinary sources, among which are of course ecology, agronomy and, in a  less extent, other scientific disciplines. It has also embraced local and traditional agricultural knowledge. On the other hand, during the last decades a large effort has aimed to integrate diverse theories, evidence and tools from ecology, developmental and evolutionary biology in what has been called eco-evo-devo.
El agroecosistema: ¿objeto de estudio de la agroecología o de la agronomía ecologizada? Anotaciones para una tensión epistémica
Authors: Lugo Perea Leyson Jimmy , Rodríguez Rodríguez Luz Helena
Published: February 2018

El presente artículo hace una discusión acerca de la tensión epistémica de la agroecología como ciencia. Para ello, los autores muestran dos tipos de agroecologías, una permeada por la racionalidad moderna occidental, cuyo estatuto epistemológico le otorga mayor correspondencia con una agronomía ecologizada, y otra que trasciende el paradigma moderno al constituirse sobre un estatuto interepistémico, lo cual permite considerar que la tradición agroecológica ha confundido la agroecología con la agronomía ecologizada. La tensión entre estas epistemes conlleva a analizar la concepción de agroecosistema y a cuestionar en cuál de estas dos vertientes epistemológicas se articula como objeto de estudio. Por último, se propone a la agroecología interepistémica como la ciencia que estudia los mundos agri-culturales.
Más allá de las etiquetas: más cerca de la agricultura
Authors: Fuentes Ponce Mariela , Rodríguez Sánchez Luis Manuel , Pinheiro Sebastiao , Macedas Jiménez Juan
Published: February 2018

México ha sido clasificado como un importador neto de alimentos, el cuarto en el mundo; donde el 80% de la población es citadina y el 20% rural. Practicar agricultura para satisfacer la demanda de alimentos sanos y de calidad en nuestro país no es una tarea fácil, sobre todo cuando el modelo actual de capitalismo impone un solo modelo homogeneizador de la praxis agrícola y de las formas de generar y difundir el conocimiento en torno a ella supeditadas al actual sistema agroalimentario global. La agroecología surgió como un paradigma que pretende ofrecer una alternativa al modelo hegemónico de la agricultura industrial del agronegocio.
Presentation
Authors: Mansilla Corona Ricardo
Published: February 2018

As in all human activity, it is the scale of their intervention that ends up affecting the environment where we develop our life activity. In this way, the almost exponential growth of the world population has led to a strong incidence of agriculture in the transformation of the surface of the planet. That is why the studies on agroecology take on a huge importance and relevance in the search for a sustainable and friendly relationship between society and nature.
Clasificaciones alternativas: la National Library of Medicine Classification.
Authors: GARZA AVALOS MARÍA LUISA
Published: February 2018

Clasificaciones alternativas: la National Library of Medicine Classification.
Entrevista. Juana Manrique de Lara
Authors: MORALES CAMPOS ESTELA
Published: February 2018

Entrevista. Juana Manrique de Lara
Recordando la conferencia internacional sobre los principios de catalogación
Authors: SOLÍS VALDESPINO OFELIA
Published: February 2018

Recordando la conferencia internacional sobre los principios de catalogación
Reseña de libros
Authors: Salas Estrada y otros Eduardo
Published: February 2018

Reseña de libros
Los valores y la investigación social
Authors: OLIVE LEÓN
Published: February 2018

Los valores y la investigación social
Reseñas
Authors: MOLINA LEÓN y otros ENRIQUE
Published: February 2018

Reseñas
Reseñas
Authors: MARTÍNEZ ARELLANO y otros FELIPE
Published: February 2018

LA MAYORÍA DE LAS NACIONES, CUALQUIERA QUE FUERA SU NIVEL DE INDUSTRIALIZACIÓN, LOGRARON ALCANZAR UN ALTO NIVEL DE CRECIMIENTO ECONÓMICO DURANTE LOS SESENTA Y COMIENZO DE LOS SETENTA. SE HA CONSIDERADO QUE UN PERÍODO TAN FRUCTÍFERO JUGÓ UN PAPEL VITAL EN EL DESARROLLO DE LOS PAÍSES. UN ESTUDIO DE TALES CAMBIOS, EN SECTORES NACIONALES COMO EL DE BIBLIOTECAS Y EDITORIALES ES ÚTIL PARA COMPRENDER LOS EFECTOS DE LAS CONDICIONES SOCIOECONÓMICAS EN EL SUMINISTRO DE LA INFORMACIÓN A LA SOCIEDAD EL PRESENTE ESTUDIO PRETENDE ANALIZAR LA INFLUENCIA DE LOS FACTORES SOCIOECONÓMICOS EN EL SUMINISTRO DE INFORMACIÓN EN UNA MUESTRA DE PAÍSES DE ALTO, MEDIANO Y BAJO DESARROLLO. PARA DETERMINAR ESTE FENÓMENO, EL PROYECTO DE INVESTIGACIÓN MIDE LA TRANSMISIÓN DE REGISTROS DE INFORMACIÓN A PERSONAS A TRAVÉS DE BIBLIOTECAS Y EDITORIALES. EL DESARROLLO SOCIOECONÓMICO, POR OTRA PARTE, SE MIDE USANDO EL CONCEPTO ECONÓMICO DE ""LAS NECESIDADES BÁSICAS"", LAS CUALES ESTÁN BASADAS EN LOS INDICADORES SOCIALES Y HUMANOS, EN VEZ DE DEPENDER DE INDICADORES PURAMENTE ECONÓMICOS COMO EL PRODUCTO NACIONAL BRUTO (PNB) PERCÁPITA. EN OTRAS PALABRA, LOS OBJETIVOS DE LA INVESTIGACIÓN SON: 1) LA COMPARACIÓN DE VARIOS ASPECTOS DEL CRECIMIENTOS DE LA INFORMACIÓN IMPRESA ENTRE PAÍSES DE POCO, MEDIANO Y ALTO DESARROLLO DESDE 1960 HASTA 1977. 2) EL ESTUDIO DE LOS FACTORES SOCIOECONÓMICOS QUE IMPULSAN O IMPIDEN EL DESARROLLO DE LA INFORMACIÓN. LOS DATOS USADOS EN ESTE TRABAJO SE TOMARON PRINCIPALMENTE DE LAS SERIES DE DATOS DEL BANCO MUNDIAL, UNESCO Y EL CONSORCIO INTERUNIVERSITARIA AMERICANA PARA LA INVESTIGACIÓN POLÍTICA. PRIMERO: SE SELECCIONÓ UN GRUPO DE PAÍSES CON DATOS DISPONIBLES. SEGUNDO: LAS SERIES PERTENECIENTES A ESTOS CASOS SE ESTÁN EXAMINANDO PARA IDENTIFICAR EL DESARROLLO DE LA INFORMACIÓN, EL SOCIOECONÓMICO APLICANDO UN ANÁLISIS ESTADÍSTICO UNIVARIABLE TAL COMO LA REGRESIÓN Y CORRELACIÓN. TERCERO. UN ANÁLISIS MULTIVARIABLE ULTERIOR, TAL COMO ANÁLISIS DE FACTORES, SERÁ APLICADO PARA CONSTRUIR UN ÍNDICE, EN EL CUAL SE ESPERA INFERIR TENDENCIAS DE MAYOR CRECIMIENTO ENTRE LOS CASOS ESTUDIADOS. LA INVESTIGACIÓN CONCLUIRÁ A FINES DE 1987.
La síntesis crítica del conocimiento bibliotecológico: su valor para la Investigación en Bibliotecología
Authors: Lafuente López Ramiro
Published: February 2018

SE PROPONE LA ELABORACIÓN DE SÍNTESIS CRÍTICAS -AUTORIZADAS POR SU NIVEL ACADÉMICO- CON OBJETO DE REVALORAR Y REPLANTEAR LOS PROCEDIMIENTOS DE INVESTIGACIÓN BIBLIOTECOLÓGICA, SOBRE TODO AQUELLOS ORIENTADOS A LA INVESTIGACIÓN MISMA, QUE NO RESPONDEN A FINES UTILITARIOS SINO A BUSCAR LA EXPANSIÓN DEL CONOCIMIENTO, Y SUS METAS NO ESTÁN ENCAMINADAS A LOGROS DE CORTO PLAZO O A INTENTOS TECNOLÓGICOS POR MEJORAR UN PROCESO O SERVICIO. LA INTENCIÓN ES RECAPITULAR INFORMACIÓN RELATIVA A LOS COMPONENTES BÁSICOS DE LA BIBLIOTECA Y SUS NEXOS CON LA SOCIO DINÁMICA CULTURAL, PARA HACER CLARAS Y FORMALES LAS LIGAS ENTRE DIVERSOS HECHOS QUE AFECTAN LA VIDA BIBLIOTECARIA PARA OBTENER UNA EXPLICACIÓN COHERENTE DE LOS MISMOS Y FACILITAR EL ORDENAMIENTO DE LA INVESTIGACIÓN BIBLIOTECOLÓGICA Y LA COMPRENSIÓN DE LOS FENÓMENOS BIBLIOTECARIOS.
El desempeño y la satisfacción laboral de bibliotecario: Contrucción de escalas de evaluación
Authors: CALLEJA NAZIRA
Published: February 2018

LA EVALUACIÓN DEL DESEMPEÑO LABORAL CONSTITUYE UN INSTRUMENTO FUNDAMENTAL PARA EL LOGRO DE LOS OBJETIVOS DE LA BIBLIOTECA. EL DESEMPEÑO DE UN TRABAJADOR ES AFECTADO POR DIVERSAS VARIABLES, ENTRE LAS QUE DESTACA LA SATISFACCIÓN LABORAL. SE HAN EFECTUADO NUMEROSOS ESTUDIOS QUE HAN INTENTADO DETERMINAR LA RELACIÓN ESPECÍFICA ENTRE DESEMPEÑO Y SATISFACCIÓN Y ENTRE ÉSTA Y UNA VARIEDAD DE FACTORES PROPIOS DEL INDIVIDUO O DE LA SITUACIÓN LABORAL. PUESTO QUE LOS HALLAZGOS SON AÚN ESCASOS E INCLUSO CONTRADICTORIOS, Y EN VIRTUD DE QUE EL DESARROLLO DE LOS INSTRUMENTOS ES, EN LA INVESTIGACIÓN, UNO DE LOS ASPECTOS MÁS COMPLEJOS, SE PRESENTA EN ESTE TRABAJO EL DESARROLLO DE LA CONSTRUCCIÓN DE UNA ESCALA DE DESEMPEÑO Y DE UNA DE SATISFACCIÓN LABORAL, PARA QUE PUEDAN SER UTILIZADAS EN EL MEDIO BIBLIOTECARIO MEXICANO CON PROPÓSITOS DE INVESTIGACIÓN O DE APLICACIÓN PRÁCTICA.
Uso del Catálogo en Bibliotecas de la UNAM
Authors: MARTÍNEZ A. FILIBERTO
Published: February 2018

EN ESTE ESTUDIO SE PRESENTAN LOS RESULTADOS OBTENIDOS DE LA APLICACIÓN DE UNA ENCUESTA A 749 USUARIOS DE LAS BIBLIOTECAS CORRESPONDIENTES A LAS DIFERENTES ESCUELAS Y FACULTADES DE LA UNAM. EL PRINCIPAL OBJETIVO DE ESTA ENCUESTA FUE OBTENER UN CONJUNTO DE DATOS GENERALES ACERCA DEL USO QUE SE HARÁ DEL CATÁLOGO EN LAS BIBLIOTECAS UNIVERSITARIAS DE ESTA INSTITUCIÓN. ALGUNOS DE LOS DATOS INCLUIDOS EN ESTE ESTUDIO SON: FACULTAD Y SEMESTRE QUE CURSAN LOS USUARIOS DE LA BIBLIOTECA. FRECUENCIA DE ASISTENCIA A LA BIBLIOTECA. MECANISMOS USADOS PARA LOCALIZAR LOS MATERIALES BIBLIOGRÁFICOS. PUNTO DE ACCESOS EMPLEADOS EN EL CATÁLOGO. DATOS SOBRE ÉXITOS Y FRACASOS EN LA BÚSQUEDA DE LOS MATERIALES BIBLIOGRÁFICOS. FACILIDAD O DIFICULTAD EN EL USO DEL CATÁLOGO. INSTRUCCIÓN RECIBIDA POR EL USUARIO SOBRE EL USO DE LA BIBLIOTECA. ASÍ MISMO, SE PRESENTAN ALGUNOS CRUZAMIENTOS ENTRE LAS DIFERENTES VARIABLES INCLUIDAS EN LA ENCUESTA. ALGUNOS DE LOS RESULTADOS A QUE SE LLEGARON DESPUÉS DE ANALIZAR LOS DATOS SON: EL USUARIO DE LA BIBLIOTECA UTILIZA EL CATÁLOGO DE LA BIBLIOTECA ÚNICAMENTE EN LA MITAD DE LOS CASOS. SOLAMENTE 48.7% DE LOS USUARIOS HAN RECIBIDO INSTRUCCIÓN SOBRE EL USO DE LA BIBLIOTECA. LOS PUNTOS DE ACCESO DEL CATÁLOGO SON USADOS INCORRECTAMENTE, YA QUE EL USUARIO BUSCA MATERIALES SOBRE DETERMINADO TEMA POR AUTOR O TÍTULO. LA PARTICIPACIÓN DE LOS BIBLIOTECARIOS EN LA INSTRUCCIÓN SOBRE LA BIBLIOTECA ES MÍNIMA. OTROS ASPECTOS SOBRE EL USO DEL CATÁLOGO SON INCLUIDOS DE UNA MANERA MÁS AMPLIA EN ESTE ESTUDIO.
Clasificación ¿Actividad Técnica o Teórica?
Authors: SANDER SUSANA
Published: February 2018

LA CLASIFICACIÓN BIBLIOTECOLÓGICA ES UNA ACTIVIDAD TEÓRICA MANIFIESTA EN LOS DISTINTOS SISTEMAS DE CLASIFICACIÓN LÓGICOS- DEDUCTIVOS, LÓGICOS- SIMBÓLICOS Y LÓGICOS- MATEMÁTICOS; ASÍ COMO EN LAS RELACIONES ABSTRACTAS QUE SE GENERAN ENTRE SUJETO Y OBJETO AL PONERSE EN PRÁCTICA CUALQUIER SISTEMA DE CLASIFICACIÓN.
La educación británica en el campo de la bibliotecología y ciencias de la información
Authors: LAU JESÚS
Published: February 2018

EL OBJETIVO DEL ARTÍCULO ES DESCRIBIR EL SISTEMA EDUCATIVO DE BIBLIOTECOLOGÍA Y CIENCIAS DE LA INFORMACIÓN (BCI) DEL REINO UNIDO. AL MOMENTO DE REDACTARLO SE TUVO EN CUENTA LAS NECESIDADES DE LAS PERSONAS QUE PUDIERAN ESTAR INTERESADAS EN ESTUDIAR EN ESTE PAÍS, Y SECUNDARIAMENTE EN LAS INVOLUCRADAS EN LA FORMACIÓN DE PROFESIONALES DE ESTE CAMPO. EL ARTÍCULO OFRECE UNA INTRODUCCIÓN A LA EVOLUCIÓN EDUCATIVA DE BCI, DEFINE LOS DIFERENTES GRADOS OFRECIDOS, PROCEDIMIENTO DE SELECCIÓN DE ESTUDIANTES, ADMISIÓN Y FINANCIAMIENTO, Y LOS CONTROLES DE CALIDAD ACADÉMICA; MÁS ALGUNOS COMENTARIOS SOBRE LA ADAPTACIÓN QUE ESTÁN EFECTUANDO LAS ESCUELAS PARA ENFRENTAR LOS CAMBIOS DEL MERCADO INFORMATIVO; Y CONCLUYE DANDO ALGUNAS DE LAS VENTAJAS DE LA INSTRUCCIÓN BRITÁNICA. AL FINAL SE ANEXA UN DIRECTORIO DE LAS ESCUELAS DE BCI, INCLUYEN DO FECHA DE FUNDACIÓN, GRADOS OFRECIDOS, NÚMERO DE MAESTROS, Y ALUMNOS POR ESPECIALIDADES.