bluuebunny/crossref_metadata_2025 huggingface dataset:
STUDI EKSPERIMEN PENGGUNAAN ABU AMPAS KOPI SEBAGAI MATERIAL PENGGANTI PARSIAL SEMEN PADA PEMBUATAN BETON
Authors: Alkhaly Yulius Rief , Syahfitri Meutia
Published: February 2018

Abstrak                                                   

 

Semen merupakan bahan pengikat agregat dalam pembuatan beton. Semen yang bereaksi dengan air, selain menghasilkan Calcium Silicate Hydrate (CSH) juga menghasilkan senyawa sampingan yaitu kalsium hidroksida (Ca(OH)2). Senyawa Ca(OH)2 memberi dampak buruk terhadap kualitas beton. Untuk mengatasinya, dalam adukan beton ditambah bahan posolan (pozzolanic material) yang mengandung silika (SiO2) yang akan bereaksi dengan Ca(OH)2 untuk menghasilkan CHS sekunder. Material posolanik organik dapat berupa limbah industri pangan (agro waste). Salah satu limbah agro waste yang belum termanfaatkan dengan baik adalah ampas kopi. Pada penelitian ini, abu ampas kopi digunakan sebagai material pengganti sebagian semen. Ampas kopi yang digunakan dibakar dalam furnace pada suhu 700ºC dan kemudian diayak dengan saringan No. 200 (75 mm). Material lain yang digunakan adalah kerikil berasal dari desa Krueng Sawang dan semen Andalas Tipe I. Benda uji berbentuk silinder dengan dimensi 150 mm x 300 mm dengan masing-masing variasi 5 buah benda uji. Kuat tekan rencana beton normal 20 MPa dengan fas 0,484. Pengujian kuat tekan dilakukan pada saat umur beton 56 hari. Hasil pengujian berdasarkan persentase abu ampas kopi 5%, 10%, 15%, dan 25% terhadap volume semen didapat kuat tekan berturut-turut 26,085 MPa, 20,162 MPa, 20,080 MPa, dan 15,358 MPa. Sedangkan kuat tekan beton normal tanpa substitusi abu ampas kopi didapat sebesar 25,406 MPa. Hasil ini menunjukkan bahwa penggantian parsial abu ampas kopi sebesar 5% terhadap semen dapat meningkatkan kuat tekan sebasar 2,67% dari beton normal. Selanjutnya, pada subsitusi 10% dan 15%, hasil kuat tekan masih memenuhi kuat tekan rencana (fc’).

 
Kata kunci: semen, abu ampas kopi, posolan, kuat tekan beton.
ANALISIS KARAKTERISTIK SEDIMEN DASAR SUNGAI TERHADAP PARAMETER KEDALAMAN
Authors: Fasdarsyah Fasdarsyah
Published: February 2018

Sedimen dasar sungai yang terbawa oleh aliran akan membentuk geometrik sungai. Kekasaran ukuran sedimen dan bentuk butiran bahan yang membentuk luas penampang basah akan menimbulkan efek hambatan terhadap aliran. Sampel yang digunakan adalah ukuran geometrik aliran sungai dan sedimen dasar pada pias-pias sungai yaitu di Meunasah Punti, Jembatan Meunasah Pange, Jembatan Lhoksukon dan Landing. Penelitian material dasar menggunakan analisis saringan yang mengacu pada grain size analysis (ASTM 422-63). Dalam menentukan kekasaran aliran ada beberapa macam pendekatan atau formulasi yang umum digunakan, yaitu :  koefisien kekasaran Manning, koefisien kekasaran  Anderson, koefisien kekasaran  Jarret, koefisien kekasaran  Raudkivi, koefisien kekasaran  Subramaya, koefisien kekasaran  Meyer dan koefisien kekasaran  Muller. Butiran tanah halus (d £ 0,150 mm) pada tengah penampang tidak sempat mengendap, sedangkan pada bagian pinggir sungai kecepatan lebih kecil sehingga butiran tanah halus terjadi pengendapan. Hubungan Karakteristik material dasar sungai terhadap geometriknya menunjukkan bahwa pada bagian tengah sungai mempunyai kandungan terbanyak adalah tanah berbutir kasar (d ³ 0,150 mm) sedangkan pada bagian pinggir sungai mempunyai kandungan terbanyak adalah tanah berbutir halus (d £ 0,150 mm). Berdasarkan hasil perhitungan koefisien kekasaran dengan berbagai formula diperoleh. Pada formulasi kekasaran Manning diperoleh nilai kekasaran minimum sebesar 0,0299 dan untuk koefisien kekasaran maksimum sebesar 0,0395 dengan nilai rata-rata 0,0347, sedangkan pada tabel Manning dengan tipe saluran alam berkelok-kelok, bersih, berceruk dan bertebing diperoleh nilai minimum 0,033 sedangkan nilai maksimum 0,045
STRATEGI PENGELOLAAN INFRASTRUKTUR JALAN DI KABUPATEN ACEH UTARA
Authors: Herman Herman Fithra , Tantawi Tantawi
Published: February 2018

Jalan raya merupakan salah satu sektor untuk memacu pertumbuhan ekonomi yang pada dasarnya merupakan sektor utama yang menghubungkan berbagai macam aktivitas ekonomi, sosial, dan budaya. Ketersediaan jalan yang baik dan stabil berpengaruh terhadap kelancaran lalulintas. Pengelolaan yang baik serta pemeliharaan jalan yang terus menerus mampu mempertahankan umur rencana jalan. Mengingat dana yang sangat terbatas yang dialokasikan oleh Pemerintah Kabupaten Aceh Utara setiap tahunnya untuk pemeliharaan jalan, maka perlu dilakukan skala prioritas pelaksanaan pemeliharaan jalan yang ada. Penelitian ini dilakukan untuk mengetahui urutan prioritas penanganan pemeliharaan jalan, berdasarkan data survei yang dianalisis dengan skala Likert. Parameter yang diperhitungkan meliputi kondisi permukaan jalan, lalulintas harian rata-rata, kapasitas jalan dan tingkat pelayanan jalan. Penelitian ini dilakukan dengan metode survei dan pengumpulan data di lapangan. Selanjutnya melakukan analisa data untuk dapat mengetahui nilai urutan prioritas berdasarkan parameter yang telah ditentukan. Berdasarkan penelitian yang dilakukan pada jalan jalan di kabupaten Aceh Utara, skala prioritas pemeliharaan jalan dilakukan berdasarkan kondisi permukaan jalan dan lalulintas harian rata-rata. Urutan dari skala prioritas pemeliharaan jalan adalah ruas jalan Krueng Mane - Sawang 14 poin (1), ruas jalan Sawang - Riseh Tunong 11 poin (2), ruas jalan Mane Tunong - Pinto Makmur 10 poin (3), ruast jalan Kuta Meuligo - Blang Reuleung 9 poin (4), ruas jalan Menasah Pulo - Teupin Reuseup 8 poin (5), dan ruas jalan Krueng Mane - Bungkah 7 poin (6). Urutan 1-3 masuk dalam peningkatan jalan dan urutan 4-6 merupakan pemeliharaan berkala.
PENGARUH BENTUK MERCU BENDUNG TERHADAP TINGGI LONCAT AIR KOLAM OLAK MODEL USBR IV (SIMULASI LABORATORIUM)
Authors: Ihsan M Kabir
Published: February 2018

Kolam olak Model USBR IV adalah salah satu jenis kolam olak yang sering digunakan pada sebuah bendung. Tinggi loncat air dalam kolam olakan direncanakan untuk meredam air akibat terjunan. Perhitungan perencanaan menggunakan rumus-rumus empiris yang telah lazim, dalam hal ini dipakai metodeVen Te Chow, 1989. Untuk membuktikan rumus-rumus tersebut dicoba melakukan simulasi laboratorium dalam beberapa model, debit yang berbeda, kemiringan yang berbeda. simulasi menggunakan flume yaitu  satu set model saluran terbuka dengan dinding tembus pandang yang diletakkan pada struktur rangka kaku, dasar saluran ini dapat diubah kemiringannya. Saluran ini dilengkapi pula dengan tangki pelayanan berikut dengan pompa sirkulasi air, pengukur debit, tube pitot, flow meter, mistar dan Mercu.Setelah dilakukan pengolahan data dan perhitungan maka di peroleh hasil besarnya debit, kemiringan dasar saluran dan perbedaan bentuk mercu mempengaruh tinggi loncat air. Semakin besar debit yang dipakai maka semakin tinggi pula loncat air yang dihasilkannya.Tinggi loncat air pada mercu bulat lebih tinggi dari pada tinggi loncat air pada mercu ambang lebar.Pada perbandingan tinggi loncat air diatas kolam olak pada mercu ambang lebar lebih tinggi dari pada mercu bulat pada debit dan kemiringan yang sama.

 
KEANEKARAGAMAN DAN KELIMPAHAN DIATOM (BACILLARIOPHYCEAE) DI PANTAI JERANJANG DESA TAMAN AYU KECAMATAN GERUNG KABUPATEN LOMBOK BARAT
Authors: Didik Santoso Hasanah Nurlaelatun, LaluJapa,
Published: February 2018

ABSTRAK Pantai Jeranjang yang terletak di desa Taman Ayu merupakan salah satu daerah buangan limbah cair karena terdapat PLTU (Pembangkit Listrik Tenaga Uap) yang menggunakan air laut sebagai pendingin dan akhirnya dibuang kembali ke laut. Tujuan penelitian ini yakni untuk mengetahui keanekaragaman dan kelimpahan diatom (Bacillariophyceae) di Pantai Jeranjang Desa Taman Ayu Kecamatan Gerung Kabupaten Lombok Barat. Metode penentuan titik sampling dan waktu sampling menggunakan purposive sampling method. Data diatom dianalisis untuk parameter indeks keanekaragaman, indeks kemelimpahan, indeks kemerataan dan nilai penting. Persen kesamaan antar stasiun ditentukan berdasarkan Bray Curtis Cluster Analysis menggunakan program biodiversity versi 2. Hasil penelitian menunjukkan spesies diatom yang teridentifikasi di Pantai Jeranjang terdiri dari 1 kelas, 2 ordo, 17 genus dan 26 spesies. Kemelimpahan spesies diatom di perairan Pantai Jeranjang sebesar 786,944individu/liter. Indeks keanekaragaman spesies diatom tergolong sedang yakni 1,383 dan kemerataan spesies diatom yakni 0,424 (penyebaran kurang merata). Hasil Bray-Curtis cluster analysis menunjukkan bahwa berdasarkan parameter biologi dan gabungan antara parameter bilogi dan parameter lingkungan, persen kesamaan tertinggi terdapat antara titik sampel I dan titik sampel II berturut-turut sebesar 78,781% dan 80,63%. Sedangkan berdasarkan parameter lingkungan persen kesamaan tertinggi terdapat antara titik  sampel I dan titik sampel III sebesar 99,030 %. Kata Kunci :Pantai Jeranjang, PLTU, Diatom ABSTRACTJeranjang coastal waters is a part of Taman Ayu village. The coastal waters of Jeranjang has been an area of liquid waste disposal of the Electric Steam Power Plant Jerajang. The purpose of this research were to know diversity and abundance of diatom (Bacillariophyceae) inthe coastal waters of Jerajang Taman Ayu village Gerung districts west Lombok. Sites and times of sampling were determined by using purposive sampling method. Data of diatom were analyzed for density,diversity, andevenness indexs and percentage important value. Percentage similarity of among stations was determined based on the Bray-Curtis cluster analysis using biodiversity program-version two. The results showed that diatom species of Jeranjang coastal waters consist of 1 class, 2 orders, 17 genus and 26 species. The abundance of diatom community in Jeranjang coastal waters was 786,944individu/liter. Diversity and evenness indexs of diatom species were 1,383 (intermediate status) and 0,424  (lack of dispersal). The highest percentage similarity was on biological parameters and the relationship between biological parameters and environmental parameters for between sample site I and sample site II (78,781% and 80,63%). Based of environmental parameters the percentage similarity of between sample site I and III was of 99.030%. Key words :Jerajang Coastal Water,Electric Steam Power Plant, Diatom
Penerapan Metode VIKOR pada Pengambilan Keputusan Seleksi Calon Penerima Beasiswa Bidikmisi Universitas Terbuka
Authors: Suniantara I Ketut Putu , Suwardika Gede
Published: February 2018

The selection process of bidikmisi scholarship involves many requirements as a criterion, thus requiring completion decisions supporters with multi-criteria. One of the decision support concept with multi-citeria is VIKOR Method. The basic concept of the VIKOR Method is to determine the rank of available samples by looking at the results of utility values, regrets and distance solutions as the best alternative of each sample by weighting criteria from the Analytic Hierarchy Process Method. This research purpose is to apply the VIKOR method in selecting the recipients of bidikmisi scholarship by considering various criteria that have been determined. The results shows that the VIKOR Method can be used to assist the selection process and determine the right scholarship recipients. At the VIKOR Method, each weight that are involved shows the result rank value, so it can be used as a compromise solution in dealing with multicriteria problems.
Pengaruh Metode Discovery Learning dan Drill serta Motivasi Belajar terhadap Hasil Belajar Bolavoli siswa Kelas VIII SMPN 1 Kediri
Authors: Ulum Miftachul
Published: February 2018

Berawal dari ketidakpuasan nilai bolavoli yang relative rendah, maka dikembangkan metode pembelajaran Discovery Learning dan drill serta motivasi belajar. Tujuan Penelitian ini adalah untuk mengetahui: adakah pengaruh antara metode discovery learning dengan metode drill terhadap hasil belajar bolavoli; adakah pengaruh motivasi belajar terhadap hasil belajar bolavoli; dan  adakah interaksi antara metode Discovery Learning dan metode Drill dengan motivasi belajar terhadap hasil belajar bolavoli pada siswa kelas VIII SMPN 1 Kediri. Metode penelitian ini adalah metode eksperimen. Sampel 134 siswa (4 kelas) dari populasi 342 siswa (10 kelas). Teknik pengumpulan data ini dengan angket motivasi belajar dan tes hasil belajar bolavoli. Teknik analisa data yang digunakan adalah ANAVA. Hasil analisis data untuk hipotesis pertama ditemukan harga F sebesar  0,379 dengan nilai signifikansi sebesar 0,539 dan untuk hipotesis kedua ditemukan harga F sebesar 5,712 dengan nilai signifikansi sebesar 0,018 serta untuk hipotesis ketiga ditemukan harga F sebesar 4,232 dengan nilai signifikansi 0,042l. Berdasarkan hasil penelitian dan hasil analisis data, dapat diperoleh kesimpulan:  Tidak ada pengaruh antara metode Discovery learning dengan metode Drill terhadap hasil belajar Bolavoli; Ada pengaruh motivasi belajar terhadap hasil belajar Bolavoli;  Ada interaksi antara metode Discovery Learning dan metode Drill dengan motivasi belajar terhadap hasil belajar Bolavoli.
MODEL KOREKSI ATMOSFER CITRA LANDSAT-7 (ATMOSPHERIC CORRECTION MODELS OF LANDSAT-7 IMAGERY)
Authors: Muchsin Fadila , Fibriawati Liana , Pradhono Kuncoro Adhi
Published: February 2018

Three methods of atmospheric correction, Second Simulation of the Satellite Signal in the Solar Spectrum (6S), Landsat Ecosystem Disturbance Adaptive Processing System (LEDAPS) and the model Fast Line-of-sight Atmospheric Analysis of Spectral Hypercubes (FLAASH), have been applied to the level 1T Landsat-7 image Jakarta area. The atmospheric corrected image is then compared with the TOA reflectance image. The results show that there is an improvement of the spectral pattern on the TOA reflectance image by the decrease of the reflectance value of each object by (1 - 11) % after the atmospheric correction of all models for visible bands (blue, green and red). In the NIR and SWIR bands there is an increase in the spectral value of about 1% to the TOA reflectance on all objects except wetland for the LEDAPS model. The percentage of the increase and the decrease in spectral values of 6S and FLAASH models have the same tendency. Analyzes were also performed on the NDVI values of each model, where NDVI values were relatively higher after atmospheric correction. The NDVI value of rice crop on FLAASH model is the same as 6S model that is equal to 0.95 and for wetland, it has the same value between FLAASH model and LEDAPS which is 0.23. NDVI value of entire scene for FLAASH model = 0.63, LEDAPS model = 0.56 and 6S model = 0.66. Before the atmospheric correction, the TOA is 0.45. Abstrak Tiga metode koreksi atmosfer diantaranya  Second Simulation of the Satellite Signal in the Solar Spectrum (6S), Landsat Ecosystem Disturbance Adaptive Processing System (LEDAPS) dan model Fast Line-of-sight Atmospheric Analysis of Spectral Hypercubes (FLAASH) telah diterapkan pada citra Landsat-7 level 1T wilayah Jakarta. Citra yang telah terkoreksi atmosfer dibandingkan dengan citra reflektan TOA. Hasilnya menunjukkan bahwa terdapat perbaikan pola spektral pada citra reflektan TOA dengan adanya penurunan nilai reflektan setiap obyek sebesar (1 – 11) % setelah dilakukan koreksi atmosfer pada semua model untuk kanal-kanal visible (blue, green dan red). Pada kanal NIR dan SWIR terjadi kenaikan nilai spektral yaitu sekitar 1% terhadap reflektan TOA pada semua objek terkecuali objek lahan basah untuk model LEDAPS. Persentase kenaikan dan penurunan nilai spektral model 6S dan FLAASH memiliki kecenderungan yang sama. Analisis juga dilakukan terhadap nilai NDVI masing-masing model, dimana nilai NDVI relatif lebih tinggi setelah koreksi atmosfer. Nilai NDVI tanaman padi pada model FLAASH sama dengan model 6S yaitu sebesar 0.95 dan untuk lahan basah memiliki nilai yang sama antara model FLAASH dan LEDAPS yaitu 0.23. Nilai NDVI seluruh scene untuk model FLAASH = 0.63, model LEDAPS = 0.56 dan model 6S = 0.66. Sebelum koreksi atmosfer (TOA) adalah 0.45.
KLASIFIKASI MULTIKSKALA UNTUK PEMETAAN ZONA GEOMORFOLOGI DAN HABITAT BENTIK MENGGUNAKAN METODE OBIA DI PULAU PARI (MULTISCALE CLASSIFICATION FOR GEOMORPHIC ZONE AND BENTHIC HABITATS MAPPING USING OBIA METHOD IN PARI ISLAND)
Authors: Anggoro Ari , Siregar Vincentius Paulus , Agus Syamsul B.
Published: February 2018

This study used multiscale classification and applied object-based image analysis (OBIA) for geomorphic zone and benthic habitats mapping in Pari islands. An optimized segmentation was performed to get optimum classification result. Classification methods for level 1 and 2 used contextual editing classification and for level 3 used support vector machines classifier. The results showed that overall accuracy for level 1 was 97% (reef level), level 2 was 87% (geomorphic zone), and level 3 was 75% (benthic habitats). Accuracy achieved by support vector machines classification was performed only in level 3 and optimum scale value achieved was 50 in compare with other scale values, i.e. 5, 25, 50, 75, 95. OBIA methods can be used as an alternative for geomorphic zone and benthic habitats map. Abstrak Penelitian ini menggunakan klasifikasi multiskala dan penerapan analisis citra berbasis obyek (OBIA) untuk pemetaan zona geomorfologi dan habitat bentik di Pulau Pari. Analisis berbasis obyek dilakukan optimasi pada proses segmentasi untuk mendapatkan hasil klasifikasi optimal. Metode klasifikasi pada level 1 dan 2 menggunakan klasifikasi contextual editing dan pada level 3 menggunakan klasifikasi Support Vector Machines (SVM). Hasil penelitian ini menunjukkan akurasi keseluruhan pada level 1 yaitu 97% (reef level), level 2 yaitu 87% (Geomorphic level), dan level 3 yaitu 75% (benthic habitat level). Klasifikasi SVM hanya diterapkan pada level 3 dan nilai skala optimum sebesar 50 dari percobaan nilai skala yaitu 5, 25, 50, 75, 95. Metode OBIA dapat digunakan sebagai alternatif untuk pemetaan zona geomorfologi dan habitat bentik.
IDENTIFIKASI STRUKTUR GEOLOGI DAN PENGARUHNYA TERHADAP SUHU PERMUKAAN TANAH BERDASARKAN DATA LANDSAT 8 DI LAPANGAN PANASBUMI BLAWAN
Authors: Azhari Anjar Pranggawan , Maryanto Sukir , Rachmansyah Arief
Published: February 2018

This paper presented used remote sensing method for identification geological structure on Blawan-Ijengeothermal field and its system. Remote sensing data, specifically Landsat 8 and DEM SRTM, provide lineaments from the 753 multispectral band and the land surface temperature (LST) from single thermal infra red band using a retrieval method. Surface emissivity was determined based on Normalized Difference Vegetation Index (NDVI) of study area. Remote sensing analysis is good approach to identification of geological structure from surface that control thermal manifestation in Blawan geothermal field. It shows Blawan fault is the main structure in geothermal field which associated with high LST and hot springs. Interpretation indicated reservoir of Blawan-Ijen geothermal system spread from Plalangan to southwest area. Abstrak Penelitian ini bertujuan untuk mengidentifikasi struktur geologi dan gambaran sistem panasbumi Blawan-Ijen dengan aplikasi penginderaan jauh. Data penginderaan jauh khususnya citra multispektral komposit 753 Landsat 8 dan DEM SRTM digunakan sebagai data untuk mendelineasi struktur patahan di permukaan. Suhu permukaan tanah diperoleh dari pengolahan citra thermal inframerah Landsat 8 dengan bantuan metode semi empiris. Emisivitas permukaan diperoleh berdasarkan klasifikasi indeks vegetasi NDVI daerah penelitian. Analisis data penginderaan jauh merupakan pendekatan yang cukup baik dalam mengidentifikasi struktur geologi yang mengontrol manifestasi panasbumi Blawan. Hasil interpretasi menunjukkan patahan Blawan adalah struktur utama di daerah geothermal Blawan yang berasosiasi dengan suhu permukaan tanah yang tinggi dan deretan mata air panas. Interpretasi mengindikasikan reservoir sistem panasbumi Blawan berada di bawah permukaan Plalangan dan menerus dari Plalangan menuju arah barat daya daerah penelitian.
Sistem Identifikasi Beban Angkutan Barang yang Terintegrasi pada Jembatan Timbang Menggunakan Kartu RFID
Authors: Yurista Nugraha Gilang Dhimas , Prayogo Rofiq Cahyo , Nugraheni Syafitri Ajeng Kartika , Berlian Ismulia Nur , Azis Pratama Rio Julian , Widianto Eko Didik
Published: February 2018

Semakin tingginya distribusi barang dari satu tempat ke tempat lain menyebabkan banyak armada angkutan barang yang mengangkut muatan melebihi beban tonase yang diizinkan. Akibatnya pengawasan kontrol muatan angkutan barang pada jembatan timbang kurang optimal karena masih melakukan pencatatan muatan secara manual. Pencatatan secara manual ini berdampak pada kemacetan yang panjang di sekitar jembatan timbang, sehingga mengganggu lalu lintas, pemalsuan data yang mendorong adanya pugutan liar, dan mengakibatkan jalanan cepat rusak karena jalan yang dilewati oleh truk-truk tersebut tidak sesuai standar. Menurut hasil survei The Asia Fundation, truk-truk yang beroperasi sepanjang sembilan rute survei pada umumnya kelebihan muatan sebesar 45% atau 4 ton di atas berat beban maksimal yang mendapatkan izin dari pihak jembatan timbang. Oleh karena itu, untuk mengurangi dampak negatif yang timbul, maka perlu dilakukan penelitian yang memberikan solusi berbasis teknologi. Sistem identifikasi beban angkut barang yang terintegrasi pada jembatan timbang menggunakan kartu RFID ini mengidentifikasi beban truk dengan memasang kartu RFID di bagian truk dan scanner di jembatan timbang sehingga truk dan beban truk dapat diidentifikasi secara otomatis. Hasil data akan diolah pada mikrokontroler yang kemudian mendapat status yang dikirim melalui SMS kontroler.
Think Talk Write Strategy toward Students’ Writing Ability
Authors: Indahyanti Rizka
Published: February 2018

The objective of this research was to find out whether or not the implementation of Think Talk Write (TTW) strategy improves students’ writing ability. The researcher applied quasi-experimental method. The population of this research is the second semester students of English Language Education. There were two classes and it consists of 60 students. The researcher used cluster random sampling technique and divided the class into two groups, one group as experimental group and another as control group. Therefore, each group consisted of 30 students. Based on the students’ result obtained and stated in findings, the researcher used t-test in inferential statistic through SPSS to test the hypothesis. It showed that the probability value is lower than alpha (α) (0.000 < 0.05). It means that H1 was accepted and H0 was rejected. Therefore, it can be concluded that the implementation of Think Talk Write (TTW) strategy improves students’ writing achievement.
Anxiety and Scholastic Achievement of Moroccan EFL College Learners
Authors: Eddine Akhajam Saad
Published: February 2018

The main purpose of this study is to investigate the relationship between anxiety and scholastic achievement among students of English department at the faculty of Arts and Humanities of Meknes, Morocco. This study focuses on the level of anxiety among English department students and how they can reduce anxiety inside and outside the classroom in a foreign language speaking environment without instructors‟ intervention. This quantitative research used two instruments; Cattle's anxiety questionnaire to test the level of anxiety and achievement test to measure their scholastic achievement. The results revealed that girls are more anxious than boys, boys achieve higher marks in scholastic achievement, and there is no relationship between anxiety and scholastic achievement.
A PANACEA FOR TEACHING LISTENING AT ISLAMIC REALM: INTERACTIVE VIDEO VIEWING TECHNIQUE
Authors: Puspitasari Hesty , Hanur Binti Suaidah
Published: February 2018

This study is designed to solve the classroom problem dealing with the improvement of listening skill of the students of one private Islamic college that also study at pesantren1 in which they have lack of exposure in learning English. To cater a new way to overcome this issue, a classroom action research focusing on the implementation of interactive video viewing technique was employed. The findings exemplify that the students show better listening achievement after the implementation of second research cycle. Keywords: interactive video, listening skill, language exposure
Sources of Turkish EFL Learners’ Foreign Language Reading Anxiety
Authors: Isler Cemre , Yildirim Ozgur
Published: February 2018

The purpose of this study was to investigate possible sources of reading anxiety experienced by Turkish EFL learners. The participants of the study were 50 first year university students studying at the English Language Teaching program of a public university in Turkey. The study employed the explanatory sequential mixed methods design. First, the quantitative data were collected through Foreign Language Reading Anxiety Scale (FLRAS), and then the qualitative data were collected through semi-structured interviews for the purpose of better understanding quantitative data findings. For analyzing the quantitative data, each participant's mean score from FLRAS was computed. As for the qualitative data, the transcribed interviews were analyzed using the constant comparison method, for which the researcher identified the recurring themes through coding, prioritizing and connecting the pieces of data. Results indicated that the participants of the study, in general, experience a moderate level of FL reading anxiety. The following three main categories of FL reading anxiety sources were identified with their ten sub-categories: (1) personal factors (inappropriate reading strategy use, lack of self-confidence, high expectations), (2) features of the reading text (topic familiarity, unknown vocabulary, complex reading structure, text length, figurative language), and (3) reading course (compulsory reading, exam).
Intelligence Quotient (IQ) as a Predictor of Reading Comprehension and Writing Achievement of EFL Learners
Authors: Ningrum Ary Setya B. , Wibowo Rohmat Agung
Published: February 2018

This study aimed at investigating Intelligent Quotient (IQ) as a predictor of reading comprehension and writing achievement as well as to correlate the students' reading comprehension with their writing achievement. The participant of the study were 32 senior high school Indonesian students. There are three instruments used in this study, those are IQ test, reading comprehension test, and writing test. Upon obtaining the whole data needed, Pearson Product Moment formula was employed to determine the correlation of IQ with reading comprehension and writing achievement as well as reading comprehension with writing achievement. The result of this study revealed that IQ made significant contribution in predicting reading comprehension (23.42%) and writing achievement (16.08%). In addition, the correlation coefficient of reading comprehension and writing achievement shows that they are moderately correlated (r=.587), meaning that reading comprehension contributes as many as 34.45% to writing achievement.
Situated Perspectives on The Motivational Trajectories of High School Students Learning English in Rural Vietnam
Authors: Pham Cuong
Published: February 2018

Despite the growing body of research on the complex and contextually contingent nature of language learning motivation, investigations into the motivation of English language learners in rural areas have remained limited. This study explores the motivational constructions of two high school students learning English in rural Southeast Vietnam from a situated perspective. The students, one female and one male, were in their first year at high school and had relatively low levels of English. Data gathering took approximately one and a half years and was based primarily on interviews drawing on a social practice approach and observations. Findings reveal that students developed diverse motivational trajectories resulting from a synergy of social and idiosyncratic elements pertinent to their own learning conditions, interpersonal relationships, and their agentive appraisals of language affordances and learning opportunities available within and across settings. The longitudinal and situated perspective of this study provides insights into the ways in which students’ appraisals of affordances were shaped and reshaped by on-going interactions with significant others as well as by the sociocultural values permeating their agentive practices.
Argumentative Statements in The 2016 Presidential Debates Of The U.S: A Critical Discourse Analysis
Authors: Khoirunisa Andini , Indah Rohmani Nur
Published: February 2018

This study investigates the argumentative statements of Hillary Clinton and Donald Trump during the debates. By employing two theories, Van Dijk's Critical Discourse Analysis (CDA) and Toulmin's model of argument, it aims to expose how various ideologies are expressed in the structure of arguments. It uses Toulmin (2003) model of argument to analyze the structures of argumentation during the debates constituting six elements (i.e. claim, data, warrant, backing, qualifier, and rebuttal). While Van Dijk’s framework covering three levels of discourse structure (the meaning, the argumentation and the rhetoric) is used to analyze the reproduction of racism, manipulation, and Islamophobia. The result indicates the discourse of the candidates contributes the reproduction of manipulation by focusing on the positive self-presentation of “us” (civilized) and negative other-presentationof “them” (terrorists) as a mind control of the audience.
English Teachers’ Questions in A Vietnamese High School Reading Classroom
Authors: Phuong Yen Hoang , Thi Nguyen Lam Giang
Published: February 2018

Recently, developing students’ thinking, especially critical thinking (CT), has become a hot issue. Critical thinking has been claimed to have an important impact on learners’ reading comprehension because it can help them analyze, evaluate, construct their thinking, solving problems and reasoning (Ennis, 1989). However, the extent that teachers’ classroom activities contribute to developing students’ critical thinking has rarely been researched. The current case study was conducted with six EFL high school teachers and 10 reading lessons in Vietnam to explore the teachers’ use of questions and to analyze if these questions could facilitate the students’ critical thinking. Classroom observations and the cognitive domain of Bloom’s taxonomy were adapted as the research instruments. The study results reveal common types of questions are often used by high school teachers in their reading lessons. Suggestions are made on types of questions that teachers should function more in their class in order to enhance students’ critical thinking.
Learning Curve in External DCR – A Trainee’s Perspective
Authors: Bhatia Karan , Sengupta Sabyasachi , Bhadauria Madhu
Published: February 2018

Purpose: The aim of this study is to determine the success rate over time in patients undergoing External Dacryocystorhinostomy (DCR) with acquired naso-lacrimal duct obstruction (NLDO), when done by a trainee ophthalmologist.Methods: The study was Prospective Observational study and was conducted in Tertiary Eye Hospital, Uttar Pradesh, India. One hundred and fourteen consecutive adult patients underwent external DCR for acquired complete NLDO by a trainee with less than 3 years of experience in ophthalmology between November 2011 and March 2013. Postoperative anatomic success rate was determined at 6 months on the basis of the patency of lacrimal sac syringing and patients were asked to subjectively evaluate improvement of their epiphora using a questionnaire.Results: Anatomical success rate across the entire study period was 93.7% and this improved from 87% in the first tertile of 38 patients to 94% in the second tertile and 100% in the final tertile of cases (p<0.05). Overall complication rate was 16.67% and reduced from 29% in the first tertile to 8% in the final tertile (p<0.05). Loss of anterior nasal flap was the commonest complication (10 cases) during the training period.Conclusion: External DCR, as a primary procedure for acquired NLDO, even when operated by trainee ophthalmologists, has a relatively high success rate that improves over time. As the learning curve improves, complication rates reduce significantly. Financial Disclosure: No author has any financial or proprietary interest in the material or method mentioned.
Prevalence of diabetic retinopathy among self-reported adult diabetics in districts of Eastern Nepal in a community based study
Authors: Agarwal Lalit T , Agrawal Nisha
Published: February 2018

Introduction: Diabetic retinopathy (DR) is the leading cause of blindness among working age adults around the world. Each year more and more people live with this condition, which can result in life-changing complications.Objective: To determine the prevalence and risk factors of diabetic retinopathy (DR) in a large community based screening programme, in order to estimate the future burden of the disease. Materials and methods: A cross sectional community based study was conducted between 1st January and 31st December 2014 in a purposive sample of adults with selfreported diabetes mellitus (DM) from Morang and Sunsari district of Nepal. A structured questionnaire was used to collect patient data. Ophthalmological evaluation was done and fundus was examined for grading DR using direct and indirect ophthalmoscope.Results: Among the 698 diabetic patients, mean age was 55.02±11.8 years (ranging from 24 to 91 years). 12.3% of diabetic were not under any treatment. Only 69.3% of patients had visited eye specialist for diabetic retinopathy screening. Prevalence of DR was found to be 15.3%; 13.9% had non-proliferative DR and 1.4% had proliferative DR. Prevalence of diabetic macular edema was 2.1%. In Morang district prevalence of DR was 14.2% and in Sunsari district it was 16.2%. In the binary-logistic regression analysis, duration of diabetes was associated with significantly increased risk of DR (OR: 1.13; 95% confidence interval (CI), 1.09 to 1.17; p<0.001). History of absence of arterial hypertension decreased the risk of DR (OR: 0.56; 95% CI, 0.36 to 0.87; p=0.01).Conclusion: One sixth of the patients with diabetes in the Eastern region of Nepal have retinopathy. Diabetic retinopathy risk increased with duration of diabetes and decreased with history of no co-existing arterial hypertension.
Chronic blepharitis like picture in patients with Discoid lupus erythematosis – Case series
Authors: Jisha K. , Rajesh P.S. , Kurien George , Sathish Gargi , Vijayamma N.
Published: February 2018

Background: Blepharitis is a very common condition encountered in ophthalmology outpatient care department. Dermatological diseases like seborrheic keratopathy and rosacea have been frequently discussed as being associated with blepharitis. However Discoid lupus erythematosis [DLE], an autoimmune condition has only rarely been reported to involve the eyelids mimicking blepharitis. DLE affecting the eyelids can produce significant morbidity with lid deformities, trichiasis and symblepharon if left untreated.Objective: To report three consecutive cases of DLE with eyelid lesions mimicking blepharitis. They presented to the department of ophthalmology at our institute from April 2014 to March 2016. The first case presented with involvement of lower eyelid in one eye. She was having multiple skin lesions which on biopsy confirmed the diagnosis of DLE. The second case was a diagnosed case of DLE who received treatment 4 years back and came with relapse of the disease affecting the eyelid. The third case was a recently biopsy confirmed case of DLE with multiple skin lesions along with bilateral eyelid involvement. Two of them had madarosis and one case had destruction of the outer lid margin at presentation. All three cases responded well to treatment with Hydrxychloroquin.Conclusion: The discoid lesions of DLE affecting the eyelids can mimic the appearance of chronic blepharitis. Ophthalmologists should be aware that DLE is a possibility while dealing with an atypical case of chronic blepharitis. Early diagnosis and treatment can prevent deformities of eyelid.
Usher syndrome Type I in an adult Nepalese male: a rare case report
Authors: Sahu Sabin , Singh Sanjay Kumar
Published: February 2018

Usher syndrome, also known as retinitis pigmentosa-dysacusis syndrome, is an extremely rare genetic disorder, characterized by retinitis pigmentosa (RP) and congenital sensorineural hearing loss. It has been estimated to account for 3-6% of the congenitally deaf population, upto 8-33% of individuals with RP and half of all cases with combined deafness and blindness (Vernon M,1969; Boughman JA et al,1983). The prevalence of Usher syndrome have been reported to range from 3.5 to 6.2 per 100,000 in different populations (Vernon M,1969; Boughman JA et al,1983; Yan D et al, 2010).We report a case of Usher syndrome type I in an adult Nepalese male with typical congenital profound hearing loss, and night blindness secondary to retinitis pigmentosa.
Overlap-avoiding Tickmodel: an Agent- and GIS-Based Method for Evacuation Simulations
Authors: Wirth Ervin , Szabó György
Published: February 2018

Evacuation simulation is a method to determine evacuation times for areas, buildings, or vessels. It is based on the simulation of crowd dynamics and pedestrian motion; in this paper, we investigated the evacuation characteristics with a new motion model. The motion model and modeling space were implemented in an agent-based environment. The model is simple and generally applicable, it navigates the agent towards the destinations (safe zones) in a mixed macro-micro approach. The simulations were tested in a geospatially modeled lecture hall of the Budapest University of Technology and Economics (BME). The evacuation times and the panic rate were both estimated; a new way of measurement was applied for panic. Finally, conclusions were made on the person count ~ evacuation time and person count ~ panic rate relations. The paper introduces the key factors of this complex modeling phenomenon and demonstrates how to set up an agent-based evacuation model. The results can simulate the real phenomenon and constitute valuable assets for decision-making in public safety issues (architectural design, evacuation protocol, regulations of space).
A Congestion Detection Based Traffic Control for Signalized Intersection
Authors: Varga István
Published: February 2018

The paper investigates a traffic-responsive control method applicable at isolated signalized intersections. The proposed strategy involves three basic parts: a traffic model, a reconfigurable regulator, and a congestion detection filter. Road traffic dynamics is modeled by the well-known store-and-forward approach. The controller is based on the efficient Linear Quadratic Regulator algorithm. The filter is designed by using the modified version (for discrete time case) of the Fundamental Problem of Residual Generation. The main achievement of the system is the ability to deal with a time-varying model parameter, namely the saturation flow rate of the road links. To this end, an error term is estimated continuously by appropriate fault detection algorithm. The predicted error term is further used by the reconfigurable controller which finally aims to mitigate the number of vehicles waiting at the stop line, i.e. the delay caused by the intersection. A simulation study is also carried out to demonstrate the effectiveness of the controller extended by congestion detection filter.
Analyzing the Edge Cracked Semicircular Disc under Uniform Compressive (ECSD(UD)) Load
Authors: Akhaveissy Amirhoshang , Permanoon Ali , Raeisi Roya
Published: February 2018

In this study, by employing the edge cracked semicircular disc under uniform (ECSD(UC)) and calculating the shape factor, the toughness of brittle materials under uniform compressive load has been quickly evaluated. Samples, on the loading location and the support, under angle β changing from 0 to 10 degrees, with the crack length (a) changing from 1 to 29 mm and the thickness (t) changing from 1 to 30 mm were investigated. By taking into account the simultaneous effect of thickness and crack length, a relationship for the shape factor (F) of the ECSD(UC) was presented.
Durability Properties of Five Years Aged Lightweight Concretes Containing Rubber Aggregates
Authors: Medine Malika , Trouzine Habib , De Aguiar José Barroso , Asroun Aissa
Published: February 2018

Scrap tyres are one of the most important wastes. They can be used in different ways because of their availability and their non-degradable nature. This paper aims to demonstrate their reuse through durability properties experimental assessment of lightweight concretes aged five years, incorporating rubber aggregates as partial replacement of 5%, 7.5% and 10% of coarse/fine and coarse aggregates. The effect of the rubber aggregates on the lightweight concretes durability has been analysed. Firstly, the water absorption was evaluated, and then the mass losses were measured through many tests: freeze-thaw, elevated temperature and attack by Na2SO4 and HCl solutions. Wetting-drying cycles were carried out in order to accelerate the aging of the studied lightweight concretes and to reduce the tests duration. It has been observed that the water absorption decreased with small rubber content. The mass losses of the mixes were almost depending on rubber aggregates content and size, and the exposures duration.
Terrestrial Laser Scanner as a Tool for Assessment of Saturation and Moisture Movement in Building Materials
Authors: Suchocki Czesław , Katzer Jacek , Rapiński Jacek
Published: February 2018

Non Destructive Testing (NDT) is a key element of modern civil engineering. It is especially important in civil and structural engineering helping both in quality control of produced elements and technical assessments of existing structures. Existing NDT methods are being continuously improved and new methods are developed or adopted from different engineering fields. Terrestrial Laser Scanner (TLS) method which is commonly used for geodetic applications has a great potential to be successfully harnessed in civil and structural engineering. TLS can be used for remote sensing of saturation of building materials. A research programme was prepared in order to prove this concept. Specimens representing most popular European building materials were scanned using TLS. Tested specimens were in different saturation states including capillary rising saturation. The saturation assessment was based on differences of values of intensity. The concept proved to be feasible and technically realistic.
Structural Reliability Assessment Based on the Improved Constrained Differential Evolution Algorithm
Authors: Zaeimi Mohammad , Ghoddosian Ali
Published: February 2018

In this work, the reliability analysis is employed to take into account the uncertainties in a structure. Reliability analysis is a tool to compute the probability of failure corresponding to a given failure mode. In this study, one of the most commonly used reliability analysis method namely first order reliability method is used to calculate the probability of failure. Since finding the most probable point (MPP) or design point is a constrained optimization problem, in contrast to all the previous studies based on the penalty function method or the preference of the feasible solutions technique, in this study one of the latest versions of the differential evolution metaheuristic algorithm named improved (μ+λ)-constrained differential evolution (ICDE) based on the multi-objective constraint-handling technique is utilized. The ICDE is very easy to implement because there is no need to the time-consuming task of fine tuning of the penalty parameters. Several test problems are used to verify the accuracy and efficiency of the ICDE. The statistical comparisons revealed that the performance of ICDE is better than or comparable with the other considered methods. Also, it shows acceptable convergence rate in the process of finding the design point. According to the results and easier implementation of ICDE, it can be expected that the proposed method would become a robust alternative to the penalty function based methods for the reliability assessment problems in the future works.
Numerical Simulation to Select Proper Strain Rates during CRS Consolidation Test
Authors: Henniche Abderrahmane , Belkacemi Smain
Published: February 2018

Constant rate of strain (CRS) and incremental loading (IL) consolidation tests are extensively used to measure consolidation properties of clayey soils. However, results of CRS test are usually strain rate dependent. In this study, a finite differences simulation of CRS test based on Terzaghi’s theory of consolidation is performed. The numerical simulation permits to evaluate a strain rates range satisfying a preset relative pressure criterion. Results of simulation show that the required relative pressure criterion can be verified, during the steady state stage of CRS test, only for particular types of soils and particular range of strain rates. Subsequently, a simple method is proposed to select, for a soil sample defined by its initial height, initial void ratio and liquid limit, an appropriate strain rates range satisfying the ASTM 4186-06 criterion. Comparison of previsions and experimental results reported in literature shows good agreement.
Aviator’s Fluid Balance During Military Flight
Authors: Levkovsky Anna , Abot-Barkan Sivan , Chapnik Leah , Doron Omer , Levy Yuval , Heled Yuval , Gordon Barak
Published: February 2018

INTRODUCTION: A loss of 1% or more of bodyweight due to dehydration has a negative effect on cognitive performance, which could critically affect flight safety. There is no mention in the literature concerning the amounts of military pilots’ fluid loss during flight. The
aim of this study was to quantify fluid loss of pilots during military flight.METHODS: There were 48 aviators (mean age 23.9) from the Israeli Air Force who participated in the study, which included 104 training flights in various flight platforms. Bodyweight, urine specific gravity,
and environmental heat strain were measured before and after each flight. Fluid loss was calculated as the weight differences before and after the flight. We used a univariate and one-way ANOVA to analyze the effect of different variables on the fluid loss.RESULTS: The mean fluid
loss rate was 462 ml · h−1. The results varied among different aircraft platforms and depended on flight duration. Blackhawk pilots lost the highest amount of fluids per flight, albeit had longer flights (mean 108 min compared to 35.5 in fighter jets). Jet fighter pilots
had the highest rate of fluid loss per hour of flight (up to 692 ml, extrapolated).CONCLUSION: Overall, at 11 flights (11%) aircrew completed their flight with a meaningful fluid loss. We conclude that military flights may be associated with significant amount of fluid loss among
aircrew.Levkovsky A, Abot-Barkan S, Chapnik L, Doron O, Levy Y, Heled Y, Gordon B. Aviator’s fluid balance during military flight. Aerosp Med Hum Perform. 2018; 89(2):9498.
Intravestibular Balance and Motion Sickness
Authors: Previc Fred H.
Published: February 2018

INTRODUCTION: A theory is presented to explain the major findings regarding motion sickness and to synthetize current theories concerning its etiology. The theory proposes that an imbalance in the output of the two major organs of the labyrinth—favoring the semicircular
canals over the otolith organs—is responsible for most instances of motion sickness as experienced in terrestrial and microgravity environments.METHODS: Strengths and limitations of current theories are first outlined before the different roles of the canals and otoliths in
the genesis of motion sickness symptoms are described.RESULTS: The proposed theory is shown to explain a large number of findings and integrate current theories.DISCUSSION: The role of vestibular imbalance in motion sickness may be a consequence of the more general differences
between the canals and otoliths in autonomic control.Previc FH. Intravestibular balance and motion sickness. Aerosp Med Hum Perform. 2018; 89(2):130–140.