bluuebunny/crossref_metadata_2025 huggingface dataset:
ANALISIS KETERAMPILAN MEMBUKA DAN MENUTUP PELAJARAN DALAM PELAKSANAAN PEMBELAJARAN MATEMATIKA SD NEGERI 192 PEKANBARU
Authors: Oktaviani Oktaviani , Syahrilfuddin Syahrilfuddin , Lazim. N Lazim. N
Published: February 2019

The background of this research is the importance of applying the skills to open and close lessons in the process of implementing classroom learning. This study aims to describe the teacher's skills in opening and closing learning in the implementation of mathematics learning at SD Negeri 192 Pekanbaru. The type of research used is descriptive qualitative. The subject of the research was the IV grade teacher named Wiki Destalia, S.Pd.I. Data collection techniques use observation, interviews, and documentation. Test the credibility of the data through triangulation and data analysis techniques, namely data management, data reduction, data presentation, and conclusion drawing. The results achieved in this study is that the teacher has implemented the skills of opening and closing lessons in the process of implementing mathematics learning, but there are several indicators on the components opening and closing lessons that are rarely even seen by teachers, such as indicators of student interaction with students very rarely seen, giving rise to motivation that the indicator presents contradictory ideas to provoke students 'interest in learning material and pay attention to students' interests.
PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE STUDENT FACILITATOR AND EXPLANING UNTUK MENINGKATKAN HASIL BELAJAR IPS KELAS III SDN 192 PEKANBARU
Authors: Kristiani panjaitan Kristiani panjaitan , Lazim.N Lazim.N , Guslinda Guslinda
Published: February 2019

The background of this study is the low grade III social studies learning outcomes of SDN 192 Pekanbaru with KKM with an average of 71.11. with the aim of improving social studies learning outcomes in grade III by applying the cooperative learning model type student facilitator and explaning. This study uses the Classroom Action Research (CAR) design which consists of four stages, namely planning, implementation, observation and reflection.  The subjects of this study were 27th grade A students consisting of 16 males and 11 females. The results showed that the classical completeness in the first cycle was 66.67% which had an increase in the second cycle of 85.19%. Teacher activities increased at each meeting, namely 75.00%, 83.33, 87.50% and 95.83%. Likewise, student activity experienced an increase in each of which was 70.83%, 79.16%, 91.66% and 95.83%. The average basic score to the first cycle increases by 1.56% and the base score to the second cycle increases by 21.35%. Based on the results of the research that has been carried out it can be concluded that the application of cooperative learning model type student facilitator and explaning can improve the learning outcomes of social studies class III SDN 192 Pekanbaru.
PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE THE POWER OF TWO TERHADAP HASIL BELAJAR IPS SISWA KELAS V SD NEGERI 125 PEKANBARU
Authors: Nur Khairanisa Nur Khairanisa , Otang Kurniaman Otang Kurniaman , Neni Hermita Neni Hermita
Published: February 2019

This research was conducted because f the low learning outcomes of IPS student. This research was conducted at Pekanbaru Public Elementary School in class Va. There were 20 student. This type of research is a pre-experiment, one type of pretest-posttest design, which is an experiment conducted on the one group without comparison. Based on the result of the study, it was found that the average score of the learning outcomes before the treatment (pretest) was 47,5 while the average test of learning outcomes after treatment (posttest) was 87, and the result of hypothesis testing used the t-test with t = 18,711 and t table = 2,093, it is concluded that tcount>ttable, then Ho is rejected, which means there are differences in social studies learning outcomes between before and after appliying the type of the power of two cooperative learning model. This shows  that there is the influence of the cooperative learning model of the power of two type on the learning outcomes of social studies at Elementary shcool 125 Pekanbaru.
MENINGKATKAN KOMPETENSI GURU DALAM MEMILIH MODEL PEMBELAJARAN MELALUI KEGIATAN SUVERVISI AKADEMIK DI SEKOLAH DASAR NEGERI 004 DUSUN TUA KECAMATAN KELAYANG KABUPATEN INDRAGIRI HULU
Authors: BAHARUDDIN BAHARUDDIN
Published: February 2019

ABTRAKPenelitian ini dilatarbelakangi oleh lemahnya guru dalam memilih model pembelajaran di Sekolah Dasar Negeri 004 Dusun Tuo Kecamatan Keloyang Kabupaten Indragiri hulu. Tujuan dari penelitian ini adalah untuk meningkatkan kompetensi guru dalam memilih model pembelajaran. Jenis penelitian ini adalah Penelitian Tindakan Sekolah (PTS) yang terdiri dari dua siklus. Hasil penelitian menunjukan, pada siklus I, dari 5 aspek yang dinilai yaitu, kesesuaian dengan format penilaian, relevansi antara waktu dengan bahan ajar, pembukaan, kegiatan inti, dan penutup mendapat nilai rata-rta sebesar 65 dengan persentase 64.96% dengan kategori cukup. Setelah dilakukan perbaikan pada siklus II, hasil penilaian rata-rata dari 15 guru meningkat, menjadi sebesar 89 dengan persentase 88.96% dengan kategori amat baik. Dari hasil penelitian ini dapat di simpulkan bahwa dengan menerapkan supervise akademik di SD Negeri 004 Dusun Tuo Kecamatan Kelayang Kabupaten Indragiri Hulu dapat meningkatkan kompetensi guru dalam memilih model pembelajaran.Kata kunci : Supervisi akademik, kompetensi guru. ABSTRACTThis research was motivated by the weakness of teachers in choosing learning models in 004 State Primary School in Dusun Tuo, Keloyang Subdistrict, Indragiri Hulu. The purpose of this study is to improve teacher competency in choosing learning models. This type of research is School Action Research which consists of two cycles. The results showed, in the first cycle, from 5 aspects assessed, namely, conformity with the format of the assessment, the relevance between time and teaching materials, opening, core activities, and closing received an average value of 65 with a percentage of 64.96% with sufficient categories. After repairs in the second cycle, the results of the average assessment of 15 teachers increased, to 89 by 88.96% with a very good category. From the results of this study, it can be concluded that by implementing academic supervision in 004 Public Primary School, Dusun Tuo, Kelayang Subdistrict, Indragiri Hulu can improve teacher competence in choosing learning models.Keywords: Academic supervision, teacher competence.
MENINGKATAN HASIL BELAJAR LOMPAT JAUH MELALUI PENDEKATAN PEMBELAJARAN PERMAINAN BOLA KATAK PADA SISWA KELAS IV SD NEGERI 011 KEMBANG HARUM KECAMATAN PASIR PENYU KABUPATEN INDRAGIRI HULU
Authors: Yulidar Yulidar
Published: February 2019

ABTRACTThis research is a classroom action research. The meeting in this study was designed in two cycles where each cycle consisted of four stages, namely planning, action, observation, and reflection. The population used is class IV SDN 011 Kembang Harum Pasir Penyu Subdistrict, Indragiri Hulu Regency in the first semester of the 2018/2019 academic year. The sample used was 39 students consisting of 19 men and 20 women. The instruments used in retrieving data were obtained from the results of the performance tests displayed by students during the test. The results of this study indicate that through the approach of playing frog ball can improve students' abilities in learning long jumps. The results of the data obtained from long jump learning through the approach of playing frog ball in grade IV students of SD Negeri 011 Kembang Harum are students whose initial ability has an average of 65.38 to 71.79 with a percentage of completeness of 69.23% after being given action on cycle I, then continued in cycle 2, there was an increase in the average student's long jump ability which was 74.48 where as many as 34 students or 87.17% students reached the specified KKM.Keywords: learning outcomes, long jump, frog ball game ABTRAKPenelitian ini merupakan penelitian tindakan kelas. Pertemuan dalam penelitian ini dirancang dua siklus dimana setiap siklus terdiri dari 4 tahap yaitu perencanaan, tindakan, observasi, dan refleksi. Adapun populasi yang digunakan adalah siswa kelas IV SDN 011 Kembang Harum Kecamatan Pasir Penyu Kabupaten Indragiri Hulu pada semester satu tahun pelajaran 2018/2019. Sampel yang digunakan adalah 39 siswa yang terdiri dari 19 orang laki-laki dan 20 orang perempuan. Instrumen yang digunakan dalam pengambilan data diperoleh dari hasil tes unjuk kerja yang ditampilkan siswa saat pelaksanaan tes. Dari hasil penelitian ini menunjukan bahwa melalui pendekatan bermain bola katak dapat meningkatkan kemampuan siswa dalam pembelajaran lompat jauh. Hasil data yang diperoleh dari pembelajaran lompat jauh melalui pendekatan bermain bola katak pada siswa kelas IV SD Negeri 011 Kembang Harum yaitu siswa yang pada kemampuan awal memiliki rata-rata 65,38 menjadi 71,79 dengan persentase ketuntasan 69,23 % setelah diberikan tindakan pada siklus I, kemudian dilanjutkan pada siklus 2, terjadi peningkatan rata-rata kemampuan lompat jauh siswa yaitu 74,48 dimana sebanyak 34 siswa atau sebesar 87,17 % siswa mencapai KKM yang ditentukan.Kata kunci: hasil belajar, lompat jauh, permainan bola katak
UPAYA MENINGKATKAN HASIL BELAJAR MATEMATIKA PADA MATERI PECAHAN SEDERHANA MELALUI MEDIA KARTU PECAHAN DI KELAS VI SD NEGERI 011 DESA BARU KECAMATAN SIAK HULU
Authors: Maimun Maimun
Published: February 2019

The background of this study is the low mathematics learning outcomes of class VI students at SD Negeri 011 Desa Baru, to overcome this problem a classroom action research was conducted by applying fraction card media. This research was conducted in SD Negeri 011 Desa Baru, the subject of this study was class VI students with a total of 24 students. The results of this study show that mathematics learning outcomes have increased in pre-cycle average value obtained is 59.8, in the first cycle obtained an average value of 68.3. And in the second cycle obtained an average value of 82.9. Based on the results of this study, it can be concluded that the mathematics learning outcomes in simple fraction material increase after the fraction card media are applied.
MEREDUKSI KECELAKAAN LISTRIK DAN PENINGKATAN EFISIENSI ENERGI LISTRIK PADA GEDUNG PERKANTORAN TUA MELALUI RETROFITTING
Authors: Rusmana Iyus
Published: February 2019

AbstrakKebakaran pada gedung perkantoran sering kali disebabkan oleh kecelakaan listrik, terutama gedung tinggi yang rata-rata berusia lebih dari 20 tahun. Hal tersebut merupakan akibat dari perubahan fungsi ruang yang tidak diimbangi dengan penyesuaian instalasi listrik yang memadai. Di samping itu, minimnya pemeliharaan turut serta memperburuk keamanan dan kualitas daya guna listrik. Untuk mengatasi hal tersebut, salah satu upaya  yang dapat dilakukan adalah dengan cara retrofitting. Penelitian dilakukan melalui survey pengukuran dan observasi visual pada gedung perkantoran di Jakarta. Setelah dilakukan retrofitting dari hasil analisis data, dapat ditunjukan bahwa konsumsi energi pada beban puncak dapat dihemat sampai dengan 27%. Sedangkan resiko kecelakaan listrik dapat ditekan serendah-rendahnya dengan memperbaiki sistem instalasinyaKata kunci : Retrofitting, Kecelakaan Listrik, Efisiensi  AbstractFire case in office buildings mostly occurs by some electrical accidents; especially it happens in most multi-storey building with twenty years old or more. It caused by some altering room function without any proper electrical installation adjustment. Moreover, less-maintenance issue made its installation quality, electrical safety and efficiency getting worse. Those issues can generates some electrical hazard risks, and also turns out of abundant energy consumption. These problems can be resolved by retrofitting. The research was conducted in Jakarta by measuring survey and visual identification. According to the data analysis, retrofitting can reduce about 27% building power consumption at peak load and it can avoid any electrical hazards.Key words : retrofitting, electrical hazard, efficiency
ANALISA POTENSI MINYAK DAN GAS BUMI DENGAN ATRIBUT SEISMIK PADA BATUAN KARBONAT LAPANGAN *ZEFARA* CEKUNGAN SUMATRA SELATAN
Authors: Miharno Fatimah
Published: February 2019

ABSTRACT*Zefara* Field formation Baturaja on South Sumatra Basin is a reservoir carbonate and prospective gas. Data used in this research were 3D seismik data, well logs, and geological information. According to geological report known that hidrocarbon traps in research area were limestone lithological layer as stratigraphical trap and faulted anticline as structural trap. The study restricted in effort to make a hydrocarbon accumulation and a potential carbonate reservoir area maps with seismic attribute. All of the data used in this study are 3D seismic data set, well-log data and check-shot data. The result of the analysis are compared to the result derived from log data calculation as a control analysis. Hydrocarbon prospect area generated from seismic attribute and are divided into three compartments. The seismic attribute analysis using RMS amplitude method and instantaneous frequency is very effective to determine hydrocarbon accumulation in *Zefara* field, because low amplitude from Baturaja reservoir. Low amplitude hints low AI, determined high porosity and high hydrocarbon contact (HC).  Keyword: Baturaja Formation, RMS amplitude seismic attribute, instantaneous frequency seismic attribute
ENVIRONMENTAL GEOLOGY POTENTIAL OF KALIGESING, PURWOREJO
Authors: Isnawan Dianto
Published: February 2019

AbstrakPenelitian ini dimaksudkan sebagai survei geologi lingkungan dengan tujuan untuk mengetahui karakteristik geologi lingkungan daerah Kaligesing, meliputi potensi sumber daya maupun bencana alam. Daerah Kaligesing termasuk dalam Kubah West Progo pada peta RBI Lembar Purworejo.  Metode penelitian berupa survei geologi lapangan, untuk memperoleh  data geomorfologi, stratigrafi, struktur geologi serta tata guna lahan. Analisis potensi pengembangan daerah dilakukan berdasarkan karakteristik geologi lingkungan setempat. Sumber daya alam ang potensial adalah pasir dan batu, serta tanah dan lahan yang relatif subur. Air permukaan didukung oleh sungai Jogobesan, bersama anak-anak sungainya. Airtanah dapat diperoleh dari mataair maupun sumur gali, dengan muka airtanah yang relatif dangkal. Mataair berdebit kecil hingga sedang (≤ 1 liter/detik). Bencana alam yang cukup potensial adalah erosi dan gerakan tanah. Banjir hanya berpotensi pada wilayah yang sempit dan setempat-setempat. Secara umum, geologi lingkungan daerah penelitian terbagi menjadi zona geologi lingkungan Pegunungan Gunungapi Purba dan Kars Jonggrangan yang masing-masing memiliki kekhasan tersendiri. Kata kunci: sumber daya alam, bencana alam, geologi lingkungan
ANALIS POTENSI PANAS BUMI DENGAN METODE GEOMAGNET DI DAERAH GEDONG SONGO UNGARAN JAWA TENGAH
Authors: Fatimah Fatimah
Published: February 2019

Panas bumi adalah energi terbarukan dan berkelanjutan yang dapat digunakan untuk menggantikan energi fosil di masa depan. Energi panas bumi dapat digunakan, harus memenuhi sistem panas bumi, sistem panas bumi adalah istilah umum yang digunakan untuk membahas interaksi antara sistem batuan dengan suhu air yang tinggi. Indikasi sistem panas bumi biasanya ditandai dengan munculnya manifestasi permukaan, bisa termasuk sumber air panas, fumarol, kolam lumpur dll. Kehadiran mata air panas dan fumarol di kawasan Gunung Ungaran merupakan indikasi kuat potensi panas bumi bawah permukaan. Penelitian ini dilakukan untuk mengetahui energi panas bumi di bawah permukaan dan membuat model sistem panas bumi berdasarkan analisis survei geologi, geokimia dan geomagnetik. Geologi Ungaran itu sendiri disusun oleh batuan vulkanik Tersier dari Miosen sampai Pleistosen, yang diduga sumber panas di Ungaran adalah sisa-sisa dari kaum muda Holosen Ungaran. Struktur di Ungaran dikendalikan oleh patahan yang mengarah ke barat daya - timur laut, yang merupakan bagian dari struktur keruntuhan, struktur ini diduga sebagai daerah pelepasan, sehingga cairan dan uap dari reservoir keluar melalui zona lemah dan muncul di permukaan. Analisis geokimia dengan pengambilan sampel fluida di Klepu dan Gedongsongo menunjukkan perbedaan, Gedongsongo menunjukkan kadar belerang (alkali) lebih tinggi. Dari peta Geomagnetik yang menunjukkan tingkat magnetik rendah berkisar antara -185 sampai -3,3 nT yang ditafsirkan sebagai sumber panas di Ungaran, setelah menggunakan penyaringan dengan distribusi perpanjangan ke atas sumber panas meluas ke utara Gedongsongo.
ISOTOPIC CHEMICAL CHARACTERISTICS OF GROUNDWATER IN BANJARARUM AREA, WEST PROGO
Authors: Peni Sri ning
Published: February 2019

Survei airtanah di bidang kimia isotop dilakukan di daerah Banjararum Kabupaten Kulon Progo. Pengamatan mataair Degan dan Dukuh dan sampling dua contoh airtanah dari mataair secara langsung di lapangan dilakukan untuk mengetahui karakteristik isotop airtanah di daerah tersebut. Metode penelitian adalah survei airtanah dan uji laboratorium isotop. Data yang dibutuhkan meliputi data fisik/kimia dan kandungan isotop airtanah. Analisis kandungan isotop airtanah dilakukan guna mendukung pemahaman genetika airtanah dengan melihat variasi kandungan hidroisotopnya. Hasil penelitian menunjukkan bahwa di daerah penelitian diketahui adanya airtanah dengan karakter isotop stabil yang ringan maupun berat. Kandungan isotop yang ringan di daerah Degan menunjukkan bahwa presipitasi sangat berperan dalam mempengaruhi kualitas airtanah setempat. Sementara itu, mataair di daerah Dukuh menunujukkan genetik airtanah yang lebih kaya isotop, dan dapat diinterpretasikan adanya  interaksi water-rocks yang lebih kuat, khususnya dari batuan karbonat Formasi Jonggrangan yang kemungkinan dilewati aliran airtanah setempat.
PENGARUH PITCH SUDU TERHADAP KINERJA TURBIN ULIR
Authors: Harianto Harianto harianto
Published: February 2019

Abstrak

               Sumber tenaga air dengan head  rendah di Indonesia masih banyak yang belum termanfaatkan sehingga perlu dikembangkan dan dimanfaatkan secra optimal. Salah satu turbin yang mampu bekerja pada head  rendah adalah turbin ulir. Banyak parameter yang berpengaruh terhadap kinerja turbin ulir, di antaranya adalah jumlah sudu, jumlah lilitan, jarak antar sudu,  sudut kemiringan, dan debit. Sehubungan dengan hal ini maka perlu dilakukan penelitian untuk mengetahui harga parameter-parameter tersebut pada kondisi kinerja optimalnya.

            Tujuan penelitian ini adalah untuk megetahui pengaruh pitch sudu , kemiringan sudu dan laju aliran air masuk terhadap putaran, daya output dan efisiensi turbin ulir.

Penelitian dilakukan terhadap suatu model turbin ulir dengan dengan diameter luar ulir (d0) 10,10 cm, ulir tunggal ,  dan panjang ulir 43 cm, dengan variasi sudut kemiringan antara 100 sampai 450, variasi laju aliran air 84 l/menit, 95 l/menit dan 105 l/menit,dan variasi  jarak antar sudu (p) 2 cm, 3 cm , 4 cm

Dari hasil penelitian ini diperoleh putaran maksimum 240 rpm pada laju aliran air 105 liter/menit ,   sudut kemiringan 20 0,dan pitch sudu 3 cm     menghasilkan daya maksimum 5,558 W dengan efisiensi maksimum sebesar 44,349.

Kata-kata Kunci: turbin ulir, head rendah, daya, efisiensi ,pitch

 

Abstract

 

Indonesia has many low head hidro power energy  resources that have not been in use yet, so it is needed to be developed and exploited. One of the low head hydro power turbines is Archemedian srew turbine. There are many parameters and variables that influence to the performance of the turbines, such as number and pitch of blades, inclination angle, and flow rate.

               The objective of the risearch is to investigate the influences of pitch of blades, inclination angle and flow rate to the turbine output power and turbine eficiency.

               The research has been conducted in a 10.1 outside diameter  , 43 cm length  model screw turbine, in which pitch of blades was varied in  2 cm ,3 cm and 4 cm, inclination angle was varied in 10 0 ,150 , 200, 250 , 300, 350 and  45 0 and flow rate was varied in   84 l/min, 95 l/min and 105 l/min.

               It is concluded from the research that maximum rotation 240 rpm, maximum power output is 5,558 Watt, maximum eficiency is 44,349 %, and they are reached at 105 l/men flow rate, 20 0  incline angle. and 3 cm pitch blades. 

Keywords : screw turbine, low head, power, eficiency, pitch.
PENGARUH PENGGANTIAN SEBAGIAN SEMEN DENGAN LIMBAH ABU VULKANIK TERHADAP KUAT TEKAN BETON SCC
Authors: Setioningsih RETNOWATI
Published: February 2019

Dalam abu vulkanik dan semen unsur kimia yang paling utama adalah silica.  Dibeberapa negara abu vulkanik sering dijadikan bahan campuran untuk membuat semen dan material beton.  Beton banyak dipakai sebagai bahan bangunan, namun dalam proses pengecoran sering mengalami kendala dikarenakan jarak tulangan yang terlalu rapat.  Salah satu perkembangan teknologi beton adalah beton Self Compacting Concrete (beton SCC).Tulisan ini membahas pemanfaatan abu vulkanik untuk aplikasi beton SCC. Uji eksperimental dilakukan untuk mengetahui pengaruh abu vulkanik di beton SCC, yang digunakan dengan penambahan dan penggantian parsial mulai dari 0% sampai dengan 10% berdasarkan berat bahan semen. Pengujian kuat tekan dilakukan dengan menggunakan tiga spesimen silinder standar untuk setiap data. Hasil pengujian menunjukkan bahwa abu vulkanik dapat memperbaiki kuat tekan beton SCC dengan metode penambahan dan penggantian semen dengan dosis optimum 5% berat semen.Kata kunci : abu vulkanik, semen, material beton dan beton SCC
SIMULASI SISTEM PEMBANGKIT LISTRIK HIBRID TENAGA SURYA DAN ANGIN DI FAKULTAS TEKNOLOGI INDUSTRI
Authors: Pradana Hendra hardianto , Mubarok Husein
Published: February 2019

Dalam melakukan aktifitas belajar mengajar di Fakultas Teknologi Industri memerlukan energi listrik.. Energi listrik yang digunakan merupakan suplai dari PLN yang berasal dari bahan bakar fosil. Untuk mengurangi ketergantungan terhadap bahan bakar fosil maka dibutuhkan pemanfaatan pembangkit listrik yang menggunakan sumber energi alternatif. Untuk memanfaatkan energi alternatif yang tersedia, peneliti menggunakan panel surya dan turbin angin sebagai pembangkit energi listrik energi terbarukan. Perangkat lunak HOMER digunakan dalam pembuatan simulasi sistem pembangkit hibrid serta digunakan untuk menentukan sistem pembangkit yang paling optimal serta dapat mengetahui nilai ekonomis dari sistem pembangkit yaitu Net Present Cost (NPC) dan Cost of Energy (COE). Hasil simulasi yang didapatkan dari perangkat lunak HOMER adalah sistem pembangkit hibrid dan panel surya mampu menghasilkan daya 39.099 kWh/tahun dan memiliki persantase penggunaan energi terbarukan sebesar 71 %. Dari sisi ekonomis pembangkit  listrik tenaga angin dan surya memiliki nilai NPC yang lebih tinggi sebesar Rp 1.137.367.996,00 dibandingkan dengan pembangkit listrik dari PLN sebesar Rp 750.060.108,00. Namun sistem pembangkit hibrid energi alternatif memiliki COEyang rendah yaitu sebesar Rp 836,34 dan niali COE dari PLN sebesar Rp 900,00.Kata kunci : Renewable Energy, sel surya, Turbin angin, HOMER
PSO Based Multi-Objective Optimization For Distribution Planning With Distributed Generation
Authors: Sugiarto Sugiarto
Published: February 2019

This paper presents a multi-objective function for optimal placement of distributed generation (DG) resources in distribution systems in order to minimize the power losses and improve voltage profile. Particle swarm optimization (PSO) and weight method are applied to the proposed technique to obtain the best compromise between these costs. Simulation results on IEEE 30-bus test system are presented to demonstrate the usefulness of the proposed procedure.
KARAKTERISTIK GEOLOGI TEKNIK DAERAH PRAMBANAN DAN SEKITARNYA, KECAMATAN PRAMBANAN, KABUPATEN SLEMAN, DAERAH ISTIMEWA YOGYAKARTA
Authors: Kristanto Wisnu Aji Dwi
Published: February 2019

Penelitian karakteristik geologi teknik daerah Prambanan dan sekitarnya, dibatasi koordinat 442800mE-449800mE dan 9136500mN-9142000mN. Penelitian dilakukan melalui pengumpulan data primer, meliputi penyelidikan geologi teknik permukaan dan dekat permukaan dengan pengamatan sifat fisik dan keteknikan batuan maupun tanah serta penggunaan klasifikasi Rock Mass Rating (RMR) dan uji kuat geser tanah menggunakan Dynamic Cone Penetrometer (DCP).Berdasarkan hasil penelitian, daerah Prambanan dan sekitarnya memiliki karakteristik geologi teknik berupa: Litologi terbagi menjadi 6 satuan (muda-tua): satuan pasir sedang, satuan pasir halus, satuan lanau, satuan tuf, satuan lapili, dan satuan batupasir. Morfologi bervariasi dari kelerengan rendah (<8°) hingga tinggi (>30°). Struktur geologi berupa kekar, rekahan, dan sesar turun dengan arah tenggara-barat laut membentuk morfologi gawir. Kedalaman muka airtanah daerah dataran cenderung dangkal (1,86 m-8,2 m) sedangkan daerah perbukitan cenderung dalam (3,8 m-16,5 m). Nilai daya dukung batuan 45 t/m2-280 t/m2 dan daya dukung tanah 2,1 t/m2-3,4 t/m2 dengan tingkat pelapukan sedikit lapuk hingga ekstrim lapuk. Kata kunci: RMR, DCP, Karakteristik Geologi Teknik
IDENTIFIKASI KERENTANAN GERAKAN TANAH BERDASARKAN DATA GEOLOGI DAERAH KALIREJO, KECAMATAN KOKAP, KABUPATEN KULONPROGO, YOGYAKARTA
Authors: Prastowo Rizqi , Trianda Obrin , Novitasari Sely
Published: February 2019

Desa Kalirejo, Kecamatan Kokap merupakan salah satu daerah rawan gerakan tanah di Kabupaten Kulon Progo. Kondisi lereng yang begitu curam menjadi salah satu penyebab utama di daerah tersebut. Ditambah dengan pemanfaatan lahan yang kurang sesuai, yaitu dengan dibangunnya pemukiman pada lereng-lereng tebing yang curam menambah risiko terjadinya longsor yang dapat menimbulkan korban harta maupun jiwa. Apalagi Kabupaten Kulonprogo merupakan kabupaten yang sedang berkembang salah satunya di bidang pariwisata. Ketersediaan informasi yang lengkap dan akurat mengenai zona kerentanan gerakan tanah beserta kebijakan yang bisa dijadikan dasar dalam setiap aktivitas pengembangan merupakan hal yang sangat diperlukan demi mencegah dan meminimalkan korban jiwa dan dampak ekonomi yang ditimbulkan oleh karena itu untuk dapat mengantisipasi hal-hal tersebut perlu dilakukan pengkajian yang lebih mendalam mengenai potensi bencana gerakan tanah dengan harapan tidak memperparah kondisi pembangunan yang dilakukan di daerah tersebut. Berdasarkan dari hasil pengolahan data didapatkan output berupa peta zona kerentanan gerakan tanah daerah penelitian yang menunjukkan 3 zona kerentanan gerakan tanah, yaitu zona kerentanan gerakan tanah rendah, sedang, tinggi.
PENGARUH TAHANAN-JENIS TANAH PADA TEGANGAN LANGKAH YANG DITIMBULKAN OLEH SEBUAH SAMBARAN PETIR
Authors: Utama Budi
Published: February 2019

Abstraks                Tulisan ini menganalisis penyebaran tegangan langkah disekitar sebuah struktur menara Base Transceiver Station (BTS) pascasambaran petir di puncaknya. Tegangan langkah diinvestigasi terhadap setiap perubahan komposisi tahanan-jenis (resistivity) tanah yang diakibatkan oleh musim kemarau dan hujan. Perhitungan dikerjakan dengan menggunakan perangkat (pemogram) Matlab dengan menyele saikan model persamaannya. Analisis ini menggambarkan bahwa besaran tegangan langkah bervariasi dengan perubahan nilai ‘tahanan jenis’ tanah ketika musim kemarau dan selama musim hujan terjadi. Pada musim hujan dan di akhir musim hujan tegangan langkah yang muncul relativ sangat kecil diban dingkan dengan pemunculan tegangan langkah saat  di penghujung musim kemarau dimana terjadi hujan pertama kali. Hasilnya sangat penting bagi negara seperti Indonesia di mana tingkat presipitasi (curah hujan) umumnya tinggi  di sebagian besar negara. Kata Kunci  :  Menara-BTS, Tegangan-Langkah, Petir.
UPAYA PEMERINTAH DALAM MELESTARIKAN URBAN HERITAGE DALAM MENDUKUNG LIVEABLE CITY KOTA YOGYAKARTA
Authors: Fanani Fahril , Kurniati Ayu Candra
Published: February 2019

Cultural heritage has values on the past cultural heritage that must be preserved and maintained in order to support urban development in the future. The city of Yogyakarta has been appointed as one of the "Liveable Cities" in Indonesia (IAP, 2014) in terms of preservation of cultural heritage. Based on the Government Regulation of Daerah Istimewa Yogyakarta No. 40/2014 in terms of “Determaning Cultural Heritage Areas”, stated that Yogyakarta has 5 (five) Cultural Heritage Areas (KCB) which are: Kraton, Kotabaru, Pakualaman, Malioboro and Kotagede. The purpose of this study is to identify the government's efforts to preserve the Yogyakarta cultural heritage building in terms of maintaning the Liveable City Index of Yogyakarta. Next, collecting data method is using observation, interviews and literature studies. The research method is a qualitative descriptive approach, by using preservation variables considering with liveable city criteria, such as: protection, development and utilitation of cultural heritage buildings. Furthermore, the results is the Yogyakarta`s government has prepared conservation guidelines and management of cultural heritage buildings for each cultural heritage area, but those guidelines and management are not integrated with the governor's regulation. The conclusion obtained is the lack of integration from several policies / regulations set by the government in the preserving of cultural heritage buildings
The Levantine British: Defying Imperial Race Categories in Colonial Alexandria
Authors: Whidden James
Published: February 2019

This treatment of the Levantine British, based on family diaries and consular reports, asks why a British colonial, Michael Barker, exiled from Egypt in 1956, continued to identify with the Alexandria locality. His last wish was to be buried in Alexandria. While the conventional image of the British colony is one shaped by ‘Orientalist’ descriptions of the ‘foreign’ as external to ‘Britishness’, the evidence suggests an enduring identification of members of the colony with the Levantine community of Alexandria. In conventional imperial discourses of the colonial era the ‘Levantine’ had negative connotations; it was a signifier of a loss of British identity and immersion into a culturally different, foreign category. Yet, the memoirs of Michael Barker, as well as consular reports on colonial institutions and the application of the Ottoman Capitulations, indicate that the boundaries of the colony were porous. Official policies insisted on a culturally distinct British identity; however, there are documented instances where the definition of ‘Britishness’ was widened to include the ‘Levantine’. The Levantine identification of Michael Barker had political ramifications, apparent in his family's decision to remain in Egypt when others emigrated out, to continue to invest in the Egyptian economy when others divested, to enable the emigration of Levantine British to British territories after Egyptian independence, and to cling to the remnants of symbols of belonging to Alexandria, the very last of which was the family tomb. That act memorialized colonial lives that stood in marked contrast to the ascendant narratives of nation and empire.
The 1924 Empire Cruise and the Imagining of an Imperial Community
Authors: Mitcham John C.
Published: February 2019

This article examines the cultural contours of the Royal Navy's postwar ‘Empire Cruise’. In late 1923, the British government dispatched a ‘Special Service Squadron’ of powerful battlecruisers on a massive public relations tour. But the popular response to this carefully orchestrated propaganda stunt varied widely. Settler populations in the Dominions often embraced the navy as a ‘bond of empire’ that reconciled Britishness with their own emerging national identities. They celebrated the navy as evidence of a shared maritime heritage handed down over the course of centuries. Meanwhile, non-white populations often responded in ways that ran counter to the intentions of the event organizers. Zulu villages in Natal hosted athletic competitions and indigenous women in Fiji organized a dance for the visiting Jack Tars – unsanctioned gatherings that offered alternative points of contact to the existing arrangements. In other locations, anti-colonial nationalists took advantage of the publicity surrounding the navy to mobilise against colonial policies. Ultimately the appearance of the navy in the far-flung ports of the empire stimulated widespread public debates about race, identity, and colonialism, and challenged the intended narrative of imperial unity.
Beyond the Empire: British Influence on the Warsaw Theatre Scene in the Nineteenth Century
Authors: Łuksza Agata
Published: February 2019

In the late nineteenth century British culture, politics and history were customary topics in Polish newspapers, and Shakespeare's dramas were the most often performed classic texts on the Warsaw theatre stage. However, in this paper focusing on Warsaw seasons 1814/1815–1900/1901 I demonstrate that surprisingly one can hardly talk about any form of cultural transfer between the British and Polish popular theatre and drama in that period. The analysis of the Warsaw repertoire, travel recollections to the United Kingdom and press articles, reveal that even though the Polish nation treated the UK as a point of reference, it consistently rejected the British theatre at large and theatre entertainment in particular, and considered it ‘crude’ and in bad taste. I claim that the geopolitical situation of Poland cannot alone account for this puzzle.
On the Frequency Up-Conversion Mechanism in Metamaterials-Inspired Vibro-Impact Structures
Authors: Rekhy Anuj , Snyder Robert , Manimala James
Published: February 2019

Conventional acoustic absorbers like foams, fiberglass or liners are used commonly in structures for industrial, infrastructural, automotive and aerospace applications to mitigate noise. However, these have limited effectiveness for low-frequencies (LF, <~500 Hz) due to impractically large mass or volume requirements. LF content being less evanescent is a major contributor to environmental noise pollution and induces undesirable structural responses causing diminished efficiency, comfort, payload integrity and mission capabilities. There is, therefore a need to develop lightweight, compact, structurally-integrated solutions to mitigate LF noise in several applications. Inspired by metamaterials, tuned mass-loaded membranes as vibro-impact attachments on a baseline structure are considered to investigate their performance as an LF acoustic barrier. LF incident waves are up-converted via impact to higher modes in the baseline structure which may then be effectively mitigated using conventional means. Such Metamaterials-Inspired Vibro-Impact Structures (MIVIS) could be tuned to match the dominant frequency content of LF acoustic sources. Prototype MIVIS unit cells were designed and tested to study energy transfer mechanism via impact-induced frequency up-conversion and sound transmission loss. Structural acoustic simulations were done to predict responses using models based on normal incidence transmission loss tests. Simulations were validated using experiments and utilized to optimize the energy up-conversion mechanism using parametric studies. Up to 36 dB of sound transmission loss increase is observed at the anti-resonance frequency (326 Hz) within a tunable LF bandwidth of about 300 Hz for the MIVS under white noise excitation. Whereas, it is found that under monotonic excitations, the impact-induced up-conversion redistributes the incident LF monotone to the back plate’s first mode in the transmitted spectrum. This up-conversion could enable further broadband transmission loss via subsequent dissipation in conventional absorbers. Moreover, this approach while minimizing parasitic mass addition retains or could conceivably augment primary functionalities of the baseline structure. Successful transition to applications could enable new mission capabilities for aerospace and military vehicles and help create quieter built environments.
Simulated Assessment of Summer Maize Drought Loss Sensitivity in Huaibei Plain, China
Authors: Wei Yanqi , Jin Juliang , Jiang Shangming , Ning Shaowei , Cui Yi , Zhou Yuliang
Published: February 2019

In an agricultural drought risk system, crop drought loss sensitivity evaluation is a fundamental link for quantitative agricultural drought loss risk assessment. Summer maize growth processes under various drought patterns were simulated using the Cropping System Model (CSM)-CERES-maize, which was calibrated and validated based on pit experiments conducted in the Huaibei Plain during 2016 and 2017 seasons. Then S-shaped maize drought loss sensitivity curve was built for fitting the relationship between drought hazard index intensity at a given stage and the corresponding dry matter accumulation and grain yield loss rate, respectively. Drought stress reduced summer maize evapotranspiration, dry matter, and yield accumulation, and the reductions increased with the drought intensity at each stage. Moreover, the losses caused by drought at different stages were significantly different. When maize plants were exposed to a severe water deficit at the jointing stage, the dry matter and grain yield formation were greatly affected. Therefore, maize growth was more sensitive to drought stress at the jointing stage when the stress was serious. Furthermore, when plants encountered a relatively slight drought during the seedling or jointing stage, which represented as a lower soil water deficit intensity, the grain yield loss rates approached the maximum for the sensitivity curves of these two stages. Therefore, summer maize tolerance to water deficit at the seedling and jointing stages were weak, and yield formation was more sensitive to water deficit during these two stages when the deficit was relatively slight.
To Stop Nitrogen Overdose in Soilless Tomato Crop: A Way to Promote Fruit Quality without Affecting Fruit Yield
Authors: Truffault Vincent , Ristorto Marlene , Brajeul Eric , Vercambre Gilles , Gautier Hélène
Published: February 2019

Precision horticulture is fundamental to ensure high quality production with a minimal environmental footprint. It offers the possibility to manage climatic and fertilization inputs closer to the plant needs. In practice, there is a tendency to over-fertilize, as nitrogen limitation can decrease photosynthesis and consequently fruit yield, but also because nutrient recycling does not lead to any substantial costs increase, thus ignoring the influence of nitrogen input on the balance between growth and metabolism. Nitrogen recommendation for tomato greenhouse production on rockwool is 16mM, even it is well established that only 50% of nitrogen amount is really absorbed by plants. This study compares the usual practice (16 mM) to a nitrogen supply to meet plant’s needs (5 mM). We analyzed plant growth and development, yield, leaf photosynthetic activity and fruit quality (sugars, acids, vitamin C,) over the entire crop period (December to October). Over-fertilization favoured the accumulation of nitrogen in leaves and stem but yield, leaf photosynthetic activity and plant architecture were not significantly improved. In addition, it decreased the quality of the tomatoes as the sugar:acid ratio decreased dramatically in the pericarp, whereas the locular gel composition remained similar. A reduction of the nitrogen supply is one solution to improve tomato quality without any reduction of yield in greenhouse. These data have to be incorporated in tomato fertigation management to define a new standard based on overall quality of tomato fruit and low environmental footprint.
Screening Tolerance to Phosphorus Deficiency and Validation of Phosphorus Uptake 1 (Pup1) Gene-Linked Markers in Thai Indigenous Upland Rice Germplasm
Authors: Chankaew Sompong , Monkham Tidarat , Pinta Wanwipa , Sanitchon Jirawat , Kaewpradit Wanwipa , Srinives Peerasak
Published: February 2019

Phosphorus (P) deficiency is a major factor limiting rice yield throughout the world. Fortunately, some rice accessions are tolerant and can thrive well, even in soils with low P content. The ability to uptake P is heritable, and thus can be incorporated into rice cultivars through standard breeding methods. The objective of this study was to screen for tolerance to phosphorus deficiency and validate the tolerant accessions with phosphorus uptake 1 (Pup1) gene-linked markers in Thai indigenous upland rice germplasm. One hundred sixty-eight rice varieties were screened in a solution culture and assigned a phosphorus deficiency tolerance index and plant symptom score. Eleven upland rice accessions (ULR026, ULR031, ULR124, ULR145, ULR180, ULR183, ULR185, ULR186, ULR213, ULR260, and ULR305), together with the lowland rice cultivar (PLD), were classified as tolerant. They were each validated by nine markers linked to the Pup1 locus and observed for the expected polymerase chain reaction (PCR) product of 0 to 9 markers. The presence or absence of the tolerant allele at the Pup1 locus showed only a slight relationship with the tolerance. Moreover, some lines such as ULR183 and ULR213 expressed high tolerance without the Pup1-linked gene product. Both accessions are useful for the exploration of novel genes conferring tolerance to phosphorus deficiency.
Using Nanobodies to Study Protein Function in Developing Organisms
Authors: Aguilar Gustavo , Matsuda Shinya , Vigano M. Alessandra , Affolter Markus
Published: February 2019

Polyclonal and monoclonal antibodies have been invaluable tools to study proteins over the past decades. While indispensable for most biological studies including developmental biology, antibodies have been used mostly in fixed tissues or as binding reagents in the extracellular milieu. For functional studies and for clinical applications, antibodies have been functionalized by covalently fusing them to heterologous partners (i.e., chemicals, proteins or other moieties). Such functionalized antibodies have been less widely used in developmental biology studies. In the past few years, the discovery and application of small functional binding fragments derived from single-chain antibodies, so-called nanobodies, has resulted in novel approaches to study proteins during the development of multicellular animals in vivo. Expression of functionalized nanobody fusions from integrated transgenes allows manipulating proteins of interest in the extracellular and the intracellular milieu in a tissue- and time-dependent manner in an unprecedented manner. Here, we describe how nanobodies have been used in the field of developmental biology and look into the future to imagine how else nanobody-based reagents could be further developed to study the proteome in living organisms.
Hystrix Brachyura Bezoar Characterization, Antioxidant Activity Screening, and Anticancer Activity on Melanoma Cells (A375): A Preliminary Study
Authors: Firus Khan Al’aina Yuhainis , Abdullah Asuhaimi Faizah , Jalal Tara K. , Roheem Fatimah Opeyemi , Natto Hatim Abdullah , Johan Muhammad Farid , Ahmed Qamar Uddin , Abdul Wahab Ridhwan
Published: February 2019

Porcupine bezoars (PBs) are masses of undigested calcareous concretions formed within the gastrointestinal tract. There are undocumented claims that PBs have antioxidant activity and can treat cancers. However, limited scientific study has been carried out to verify these traditional claims. Hence, this study was conducted to characterize the chemical profile and validate the antioxidant and anticancer activity against melanoma cells (A375). PB extract was initially subjected to Fourier-transform infrared spectroscopy (FTIR), gas chromatography–mass spectrometry (GCMS), total phenolic content (TPC), and total flavonoid content (TFC) analyses. The bioautography of antioxidant assays, namely 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS), 2,2-diphenyl-1-picrylhydrazy (DPPH), and β-carotene was performed. An in vitro A375 cell viability assay, apoptosis assay, cell cycle arrest assay, and gene expression assay were carried out as well. The experimental finding revealed 5,10-diethoxy-2,3,7,8-tetrahydro-1H,6H-dipyrrolo[1,2-a:1′,2′-d]pyrazine, ursodeoxycholic acid, and cholest-5-en-3-ol (3 beta)-, carbonochloridate are major compounds detected in PB extract. PB extract has low phenolic content, viz. 698.7 ± 0.93 (µg GAE/5 mg dry weight). The bioautography antioxidant assays revealed a potent antioxidant effect (ABTS > DPPH > β-carotene), with free radical scavenging activity. Furthermore, PB extract exhibited dose- and time-dependent inhibition of cancer activity on A375 cells due to the exhibition of apoptosis via an intrinsic pathway.
Influence of ZrO2 Nanoparticles on the Microstructural Development of Cement Mortars with Limestone Aggregates
Authors: Trejo-Arroyo Danna L. , Acosta Karen E. , Cruz Julio C. , Valenzuela-Muñiz Ana M. , Vega-Azamar Ricardo E. , Jiménez Luis F.
Published: February 2019

In this research, the effect of the addition of zirconium oxide-synthesized nanoparticles on the microstructural development and the physical–mechanical properties of cement mortars with limestone aggregates was studied. Zirconia nanoparticles were synthesized using the co-precipitation method. According to XRD analysis, a mixture of tetragonal (t) and monoclinic (m) zirconia phases was obtained, with average crystallite sizes around 15.18 and 17.79 nm, respectively. Based on the ASTM standards, a mixture design was obtained for a coating mortar with a final sand/cement ratio of 1:2.78 and a water/cement ratio of 0.58. Control mortars and mortars with ZrO2 additions were analyzed for two stages of curing of the mortar—7 and 28 days. According to SEM analysis, mortars with ZrO2 revealed a microstructure with a high compaction degree and an increase in compressive strength of 9% on the control mortars. Due to the aggregates’ characteristics, adherence with the cement paste in the interface zone was increased. It is suggested that the reinforcing effect of ZrO2 on the mortars was caused by the effect of nucleation sites in the main phase C–S–H and the inhibition of the growth of large CH crystals, and the filler effect generated by the nanometric size of the particles. This produced a greater compaction volume, suggesting that faults are probably originated in the aggregates.
Optimizing the Preparation of Semi-Crystalline Paraffin/Poly(Urea-Formaldehyde) Microcapsules for Thermal Energy Storage
Authors: Zhang Kai , Zhou Qian , Ye Hai-Mu
Published: February 2019

Paraffin, the most common phase change material, has been widely utilized as the core component in thermal energy storage in the form of microcapsules. In this study, semi-crystalline paraffin is capsulated into a poly(urea-formaldehyde) (PUF) shell by a two-step polymerization process. To obtain the microcapsule with good morphology and high latent heat, sodium chloride and crosslinker (a mixture of ammonium chloride and resorcinol with a weight ratio of 1:1) are incorporated and their addition amounts were optimized through differential scanning calorimetry (DSC) and SEM. The optimized microcapsules were obtained by adding 4 wt% sodium chloride, and 0.25 wt% crosslinker exhibits a diameter of several microns and a melting enthalpy of 110 J/g. This detailed study shows that sodium chloride strongly affects the morphology of paraffin emulsion by enlarging droplets, widening the size distribution, and enhancing the stability, which should be attributed to the enhancement of electric double layer strength. In addition, sodium chloride can weaken the Zeta potential of prepolymer and provides more opportunity for prepolymer to deposit on the surface of emulsion droplets. The two components in crosslinker play different roles in the polymerization process. Ammonium chloride reacts with prepolymers and reduces the pH of system, which can accelerate the curing process, while resorcinol probably participates in polymerization as a comonomer.