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INDONESIA
Jurnal Penelitian Saintek
Published by Universitas Negeri Yogyakarta
ISSN : 14123991     EISSN : 25287036     DOI : 10.21831
Core Subject : Science,
Decision Sciences, Operations Research & Management
Arjuna Subject : -
Articles 8 Documents
 1 
Search results for , issue "Vol 24, No 2: Oktober 2019" : 8 Documents clear
THE EFFECT OF ADDITIVE COMBINATION AND Azotobacter sp. TOWARDS Glycine max. L. GROWTH Yunia Vella Alfani; Pudjawati Suryatmana; Ade Setiawan
Jurnal Penelitian Saintek Vol 24, No 2: Oktober 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (24.683 KB) | DOI: 10.21831/jps.v24i2.20130

Abstract

This study was aimed at determining the increasing of growth and production of soybean crops by giving Azotobacter sp. and additive materials such as coconut water, molasses, and bran. This research was conducted on Januari 2018 to April 2018 at Ciparanje Experimental Field Faculty of Agriculture. Universitas Padjadjaran, Jatinangor, Sumedang, West Java Province, on ± 774 meters above sea level (asl) using single factor randomized block design with 10 treatments; Azotobacter sp. and additive materials combination such as coconut water, molasses, and bran in three repetitions. The observations on the parameters observed in the final vegetative phase were on plant height, chlorophyll content, and population of Azotobacter sp. using Total Plate Count (TPC) method.The results show that the application of combination additives materials and Azotobacter sp. effect on populations Azotobacter sp., chlorophyll content, plant height and number of soybean pods (Glycine max L.). Application of coconut water independently, water added with Azotobacter sp., and combination of additive with Azotobacter sp. can give the best effect to the content of chlorophyll, plant height, and soybean crops components (Glycine max. L.).PENGARUH KOMBINASI BAHAN ADITIF DAN Azotobacter sp. TERHADAP PERTUMBUHAN Glycine max. L.Penelitian ini bertujuan untuk mengetahui pertumbuhan dan produksi tanaman kedelai dengan memberikan Azotobacter sp. dan aditif air kelapa, molase, serta dedak. Penelitian ini dilaksanakan pada Januari 2018-April 2018 di Kebun Percobaan Ciparanje Fakultas Pertanian Universitas Padjadjaran, Jawa Barat pada ± 774 meter di atas permukaan laut (dpl). Penelitian ini menggunakan rancangan acak kelompok dengan 10 perlakuan pemberian Azotobacter sp. dan aditif air kelapa, molase, serta dedak dengan tiga ulangan. Pengamatan terhadap parameter yang diamati pada fase vegetatif akhir yaitu tinggi tanaman, kandungan klorofil, dan populasi Azotobacter sp. dengan metode Total Plate Count (TPC). Hasil penelitian menunjukkan aplikasi kombinasi bahan aditif dan penambahan pupuk hayati Azotobacter sp. berpengaruh terhadap populasi Azotobacter sp., kadar klorofil, tinggi tanaman dan jumlah polong tanaman kedelai (Glycine max L.). Aplikasi air kelapa secara mandiri, air kelapa yang ditambahkan dengan Azotobacter sp., dan kombinasi bahan aditif dengan Azotobacter sp. dapat memberikan pengaruh terbaik terhadap kandungan klorofil, tinggi tanaman, dan komponen hasil tanaman kedelai (Glycine max. L.). 
THE EFFECT OF BLADE NUMBER AND WATER VELOCITY TOWARD THE PERFORMANCE OF HELIKS GORLOV TURBINE Jeri Pranio; Karnowo Karnowo
Jurnal Penelitian Saintek Vol 24, No 2: Oktober 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (24.683 KB) | DOI: 10.21831/jps.v24i2.20287

Abstract

This study was aimed at determining the influence of the number of blades and water velocity on the performance of vertical axis water turbine type Helical Gorlov. The method used was an experimental method. The descriptive analysis method was also used to analyze the data. The data obtained were in the form of variations of blades number and water velocity. The variations in the number of blades used were 2 blades, 3 blades, and 4 blades. While water velocity variations used were 0.81 m / s, 0.94 m / s, 1.08 m / s, and 1.18 m / s. The parameters were used to measure the amount of current and voltage produced by the multimeter and the number of rotations per minute (rpm) of the turbine produced by the tachometer. The results show that the number of blades and water velocity affected the performance of the Gorlov helical water turbine. The most optimal Gorlov helical turbine based on the results of research with the highest power coefficient (Cp) value is a turbine with 2 blades at a water velocity of 0.94 m/s which produces a Cp value of 0.00376 and a TSR value of 1.35.PENGARUH JUMLAH SUDU DAN KECEPATAN AIR TERHADAP KINERJA TURBIN AIR SUMBU VERTIKAL TIPE HELIKS GORLOVPenelitian ini bertujuan untuk pengaruh jumlah sudu dan kecepatan air terhadap kinerja turbin air sumbu vertikal tipe Heliks Gorlov. Metode yang digunakan dalam penelitian ini adalah eksperimen. Penelitian ini menggunakan analisis deskriptif.Data yang duperoleh berupa variasi jumlah sudu dan variasi kecepatan air. Variasi jumlah sudu yang digunakan adalah 2 sudu, 3 sudu, dan 4 sudu. Variasi kecepatan air yang digunakan yaitu 0,81 m/s, 0,94 m/s, 1,08 m/s, dan 1,18 m/s. Parameter dalam penelitian ini yang digunakan untuk menentukan kinerja adalah mengukur besarnya arus dan tegangan yang dihasilkan multimeter dan banyaknya rotasi per menit (rpm) dari turbin yang dihasilkan tachometer.Hasil penelitian menunjukkan bahwa jumlah sudu dan kecepatan air mempengaruhi kinerja turbin air heliks gorlov. Kedua, kecepatan air mempengaruhi kinerja turbin air heliks gorlov.Turbin heliks Gorlov paling optimal berdasarkan hasil penelitian dengan nilai koefisien daya (Cp) tertinggi yaitu turbin dengan 2 sudu pada kecepatan air 0,94 m/s yang menghasilkan nilai Cp sebesar 0,00376 dan nilai TSR 1,35.
THE EFFECT OF MICRO PARTICLE STEEL SLAG ON P-RETENTION AND PH ON ANDISOL Ai Ening Rostini; Rina Devnita; Oviyanti Mulyani; Benny Joy
Jurnal Penelitian Saintek Vol 24, No 2: Oktober 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (24.683 KB) | DOI: 10.21831/jps.v24i2.20374

Abstract

This study was aimed at determining the effect of microparticles steel slag towards P retention, soil acidity in Andisol from Ciater, West Java. The research was conducted in November 2017 until January 2018. The andisol was taken from the PTPN XIII-Ciater Tea Plantation, Subang, while steel slag was obtained from PT. Krakatau Steel Indonesia. The study used a Completely Randomized Design consisting of 11 treatments and 3 replications so that the total of all treatments was 33 experimental polybags. The treatments given were  500 mesh steel slag and 1.7 µm steel slag. The incubation media were stored in the Soil Physics Laboratory of the Faculty of Agriculture at UNPAD for 2 months. The observed parameters were P retention analyzed by the Blakemore method and soil pH which was analyzed by the electrometry method. The results show that the steel slag microparticles significantly affected the reduction in P retention and increased pH in Andisols. The best dose for increasing the pH is 7%. Steel slag with a size of 1.7 µm is able to increase the pH from 4.53 to 7.99 after a two-month incubation.PENGARUH PARTIKEL MIKRO TERAK BAJA TERHADAP RETENSI P DAN PH PADA ANDISOLPenelitian ini bertujuan untuk mengetahui pengaruh pemberian partikel mikro terak baja terhadap retensi P, kemasaman tanah pada Andisol asal Ciater, Jawa Barat. Penelitian telah dilaksanakan pada bulan November 2017 sampai dengan Januari 2018. Andisol berasal dari Perkebunan Teh PTPN XIII-Ciater, Kabupaten Subang, sedangkan terak baja diperoleh dari PT. Krakatau Steel Indonesia. Rancangan penelitian yang digunakan adalah Rancangan Acak Lengkap yang terdiri dari 11 perlakuan dan 3 ulangan, sehingga total seluruh perlakuan adalah 33 polibeg percobaan. Perlakuan yang diberikan yaitu kontrol, terak baja ukuran 500 mesh dan terak baja ukuran 1,7 µm. Media inkubasi disimpan di Laboratorium Fisika Tanah Fakultas Pertanian UNPAD dan diinkubasikan selama 2 bulan.Parameter yang diamati adalah Retensi P dianalisis dengan metode Blakemore, dan pH tanah dianalisis dengan metode elektrometri.Hasil penelitian menunjukkan bahwa pemberian partikel mikro terak baja berpengaruh nyata terhadap penurunan retensi P dan peningkatan pH pada Andisol asal Ciater, Jawa Barat. Sedangkan dosis terbaik dalam meningkatkan pH yakni 7% terak baja dengan ukuran 1,7 µm mampu meningkatkan pH dari 4,53 menjadi 7,99 setelah dua bulan inkubasi.
THE RELATIONSHIP AMONG PEDICULOSIS CAPITIS, ANEMIA AND LEARNING ACHIEVEMENT IN ELEMENTARY STUDENTS Nunung Sulistyani; Nur Khikmah
Jurnal Penelitian Saintek Vol 24, No 2: Oktober 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (24.683 KB) | DOI: 10.21831/jps.v24i2.26500

Abstract

This study was aimed at determining the relationship between the Pediculus humanus capitis infestation condition, anemia status and learning achievement in primary school-age children. This study was conducted at SD Bangunharjo Sewon Bantul, Yogyakarta. This study is an observational analytic study with cross sectional design in which the variables are measured in one measurement without intervening. The data obtained through pediculosis examination, Hb examination, and measurement of learning outcomes. The data then were analyzed descriptively presented in tabular form, then performed statistical analysis using the chi-square test. The results show that the students suffering from pediculosis, 57.9% also suffering from anemia and 51.0% having poor category achievement. In line with other researchers, one of the factors that influence one’s learning achievement is the memory factor. Someone’s anemia status can affect one’s memory. The prevalence of Pediculus humanus capitis infestation is 38.3%. Chi-square test showed a significant relationship between Pediculus humanus capitis infestation condition, anemia status, and learning achievement.HUBUNGAN PEDIKULOSIS KAPITIS, STATUS ANEMIA DAN PRESTASI BELAJAR PADA SISWA SEKOLAH DASAR Penelitian ini bertujuan untuk mengetahui hubungan kejadian infestasi Pediculus humanus capitis (kutu kepala) dengan status anemia dan prestasi belajar pada anak usia sekolah dasar. Penelitian ini dilakukan di SD wilayah Bangunharjo Sewon Bantul Yogyakarta. Penelitian ini merupakan penelitian analitik observasional dengan desain cross sectional. Variabel diukur dalam satu kali pengukuran dengan tidak melakukan intervensi. Data penelitian diperoleh melalui pemeriksaan pedikulosis, pemeriksaan Hb, dan pengukuran hasil belajar. Data dianalisa secara deskriptif yang disajikan dalam bentuk tabel, kemudian dilakukan analisis statistik menggunakan Uji chi-square. Hasil penelitian ini menunjukan bahwa menderita pedikulosis sebesar 57,9% menderita anemia dan sebesar 51,0% dengan prestasi belajar kategori kurang baik. Salah satu faktor yang mempengaruhi prestasi belajar seseorang yaitu faktor daya ingat. Status anemia seseorang dapat mempengaruhi daya ingat seseorang. Prevalensi infestasi Pediculus humanus capitis sebesar 38,3%. Uji chi-square menunjukkan adanya hubungan yang signifikan antara kejadian infestasi Pediculus humanus capitis dengan status anemia dan prestasi belajar.
EXPERIMENTAL STUDY ON THE PHENOMENA ON THE SUCCESSIVE DROPLETS IMPACTING HOT COPPER SURFAC Arif Widyatama; Akmal Irfan Majid; Teguh Wibowo; Deendarlianto Deendarlianto; Samsul Kamal
Jurnal Penelitian Saintek Vol 24, No 2: Oktober 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (24.683 KB) | DOI: 10.21831/jps.v24i2.26923

Abstract

This study was aimed at investigating the phenomena and interactions between water droplets and hot metal surfaces using an experimental method. In this study, the droplet was dropped from 50 mm from the top of the metal surface with a frequency of 8.5 droplets per second. The observed droplet diameter was 3.12 mm. The metal used was copper with a surface temperature between 110-240 ° C. High speed video camera with a speed of 2000 fps was used to record visual data. Then the image processing technique was applied to calculate the change in droplet diameter. The results show that at low temperatures, droplets tend to maintain their initial position of contact with fluctuating deformations. While at high temperatures, a bounce phenomenon occurs which results in collisions between droplets being imperfect. Visualization results can reveal the complete change in the droplet geometry in the form of spreading ratio and complete apex height. The temperature of 140° C is the initial transition area for phenomena that result in droplets has no contact with hot surfaces so that the process of heat transfer between surfaces is inhibited.STUDI EKSPERIMEN PADA FENOMENA SUCCESSIVE DROPLETS MENUMBUK PERMUKAAN TEMBAGA PANASPenelitian ini bertujuan untuk mempelajari fenomena dan interaksi antara tetesan air (droplet) dan permukaan logam panas dengan metode eksperimental. Pada penelitian ini, droplet dijatuhkan dari posisi 50 mm dari atas permukaan logam dengan frekuensi 8,5 droplet per detik. Diameter droplet yang diamati sebesar 3,12 mm. Logam yang digunakan adalah tembaga dengan temperatur permukaan di antara 110-240° C. High speed video camera dengan kecepatan 2000 fps digunakan untuk merekam data visual. Teknik image processing diaplikasikan untuk menghitung perubahan diameter droplet. Hasil penelitian menunjukkan bahwa pertama, pada temperatur rendah, droplet cenderung mempertahankan posisi awal kontak dengan perubahan bentuk yang fluktuatif. Kedua, temperatur tinggi, terjadi fenomena bouncing yang mengakibatkan tumbukan antar droplet menjadi tidak sempurna. Hasil visualisasi dapat mengungkap perubahan geometri droplet berupa spreading ratio dan apex height secara lengkap. Dari penelitian ini juga diketahui bahwa temperatur 140°C menjadi daerah transisi awal terjadinya fenomena yang mengakibatkan droplet tidak bersinggungan dengan permukaan panas sehingga proses perpindahan kalor antar permukaan terhambat.
THE EFFECT OF OPENING TYPE ON THERMAL CONVENIENCE OF THE OLD AND NEW BUILDING CLASSROOM Ali Anton Senoaji; Arif Kusumawanto; Sentagi Sesotya Utami
Jurnal Penelitian Saintek Vol 24, No 2: Oktober 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (24.683 KB) | DOI: 10.21831/jps.v24i2.25788

Abstract

This study was aimed at analyzing the effect of opening type on the thermal convenience of classrooms in old and new buildings at SMK Negeri 3 Yogyakarta. This study used a qualitative comparative method and the simulation of IES VE 2018. The field air measurement is carried out at 10 measurement points and 5 measurement points in each class, with a height of 1.5 m. Field measurements were carried out in March 2019, at 06.30-16.30 WIB. The parameters used in the study were air temperature, humidity and wind speed. Air temperature and humidity were measured using a Thermo hygrometer. Wind speed was measured using an anemometer. The data collection method is carried out by observation and measurement. Root Mean Squared Error (RMSE) was used to validate the data. The results show the best thermal convenience of the classroom was obtained during the simulation using the type of Windows Awning, with a full aperture area. Simulation results show a comfortable distribution of airflow in the classroom at wind speeds above 0.15-0.28 m/sec, Temperature 25.07-27.10oC.PENGARUH TIPE BUKAAN TERHADAP KENYAMANAN TERMAL RUANG KELAS BANGUNAN LAMA DAN BARU Tujuan dari penelitian yaitu menganalisis pengaruh bukaan terhadap kenyamanan termal ruang kelas pada bangunan lama dan baru, di SMK Negeri 3 Yogyakarta. Penelitian ini menggunakan metode komparatif kualitatif yaitu dan hasil simulasi IES VE 2018. Pengukuran udara luar dilakukan pada 10 titik pengukuran dan sebanyak 5 titik pengukuran disetiap kelasnya, dengan ketinggian 1,5 m. Pengukuran lapangan dilakukan pada bulan Maret tahun 2019, waktu 06.30-16.30 WIB. Parameter yang digunakan dalam penelitian yaitu temperatur udara, kelembaban dan kecepatan angin. Temperatur udara dan kelembaban diukur dengan menggunakan alat thermo hygrometer. Kecepatan angin diukur dengan menggunakan alat anemometer. Metode pengumpulan data dilakukan dengan metode pengamatan dan pengukuran. Validasi data menggunakan Root Mean Squared Error (RMSE). Hasil penelitian menunjukkan kenyamanan termal ruang kelas terbaik diperoleh pada saat simulasi menggunakan tipe bukaan ke atas atau Awning Windows, dengan area bukaan penuh. Hasil simulasi menunjukkan distribusi aliran udara yang nyaman di dalam ruang kelas pada kecepatan angin di atas 0,15-0,28 m/det, Temperatur 25,07 -27,10o C. 
RESPONSE OF TURMERIC SHOOT EXPLANT AFTER CYTOKININ WITH IN VITRO Marhan Nurullia; Erni Suminar Suminar; Anne Nurani
Jurnal Penelitian Saintek Vol 24, No 2: Oktober 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (24.683 KB) | DOI: 10.21831/jps.v24i2.20475

Abstract

This study was aimed at determining the response of turmeric shoot explants after the provision of various types and concentrations of cytokinins in vitro. This experiment was conducted at the Tissue Culture Laboratory, Faculty of Agriculture, Padjadjaran University from January to April 2018. The data were analyzed using T-Test. The experimental method used in this research was Completely Randomized Design (CRD). Explant planting was carried out in Laminar Air Flow. The experiment consisted of 7 treatments consisting of 4 replications and each test consisted of 4 units. Observation of this experiment was carried out for 12 MST. The main observations were made on the data that were tested statistically namely the percentage of explant growing shoots, percentage of explant growing roots, shoot height, number of tuns, number of roots and root length. The treatments consisted of Control, 2.5 mg L-1 BAP, 5 mg L-1 BAP, 0.5 mg L-1 TDZ, 1 mg L-1 TDZ, 0.01 mg L-1 Zeatin and 0.1 mg L Zeatin -1. The results show that the treatment of 1 mg L-1 TDZ shows the best response to the growth of turmeric explants by increasing the number of turmeric shoot explants than the others.RESPONS EKSPLAN TUNAS KUNYIT SETELAH SITOKININ SECARA IN VITROTujuan dari penelitian ini yaitu untuk melihat respons eksplan tunas kunyit terhadap pemberian berbagai jenis dan konsentrasi sitokinin secara in vitro. Percobaan ini dilakukan di Laboratorium Kultur Jaringan, Fakultas Pertanian, Universitas Padjadjaran dari bulan Januari sampai April 2018. Hasil percobaan dianalisis dengan Sample T-Test. Metode percobaan yang digunakan dalam penelitian ini yaitu Rancangan Acak Lengkap (RAL). Penanaman eksplan dilakukan di dalam Laminar Air Flow. Percobaan terdiri dari 7 perlakuan sebanyak 4 ulangan dan setiap ulangan terdiri dari 4 unit. Pengamatan percobaan ini dilakukan selama 12 MST. Pengamatan utama dilakukan terhadap data-data yang diuji secara statistik yakni persentase eksplan tumbuh tunas, persentse eksplan tumbuh akar, tinggi tunas, jumlah tunas, jumlah akar dan panjang akar. Perlakuan terdiri dari Kontrol; 2,5 mg L-1 BAP; 5 mg L-1 BAP; 0,5 mg L-1 TDZ; 1 mg L-1 TDZ; 0,01 mg L-1 Zeatin; dan 0,1 mg L-1 Zeatin. Hasil penelitian menunjukkan bahwa perlakuan 1 mg L-1 TDZ menunjukkan respons yang lebih baik terhadap pertumbuhan eksplan kunyit dengan meningkatkan jumlah tunas eksplan tanaman kunyit daripada yang lainnya.
EFFECT OF INOCULANT AND RAMIE COMPOST ON EFFICIENCY DEGRADATION HIDROCARBON, POPULATION TOTAL FUNGI AND RAMIE Yuhanidz Yuhanidz; Pudjawati Suryatmana; Betty Natalie Fitriatin
Jurnal Penelitian Saintek Vol 24, No 2: Oktober 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (24.683 KB) | DOI: 10.21831/jps.v24i2.20128

Abstract

This study was aimed at determining the effect of ramie, ramie compost and types of inoculants on the efficiency of hydrocarbon degradation, total fungi population, and ramie height. The study was conducted using factorial RAK with 2 factors. The calculation of the total population of Aspergillus niger was done using the total plate count (TPC) method, while the measurement of total petroleum hydrocarbons (TPH) levels used the gravimetric method. The experiment was conducted at the Greenhouse of the Faculty of Agriculture, Padjadjaran University, Jatinangor, West Java with an altitude of 822 meters above sea level. Soil analysis was carried out at the Soil Fertility and Plant Nutrition Laboratory and the Soil Biology Laboratory, Faculty of Agriculture, Padjadjaran University. The experiment was conducted from November 2017 to February 2018. The results of the study do not show an interaction between inoculants and ramie compost on the efficiency of degradation, total fungi population and ramie height in the phytoremediation process of petroleum waste. The results also showed that there was no best type of inoculant and ramie compost dose for degradation efficiency, total fungi population and ramie height in phytoremediation of petroleum waste.PENGARUH INOKULAN DAN KOMPOS RAMI TERHADAP EFISIENSI DEGRADASI HIDROKARBON, POPULASI TOTAL FUNGI DAN TINGGI RAMI Penelitian ini bertujuan untuk mengetahui pengaruh rami, kompos rami, dan jenis inokulan terhadap efisiensi degradasi hidrokarbon, populasi total fungi dan tinggi tanaman rami. Penelitian dilakukan dengan menggunakan RAK faktorial dengan 2 Faktor. Perhitungan populasi total Aspergillus niger dilakukan dengan menggunakan metode total plate count (TPC), sedangkan pengukuran kadar total petroleum hydrocarbons (TPH) menggunakan metode gravimetri. Percobaan dilaksanakan di Rumah Kaca Fakultas Pertanian Universitas Padjadjaran Jatinangor, Kabupaten Sumedang, Provinsi Jawa Barat dengan ketinggian 822 mdpl. Analisis tanah dilakukan di Laboratorium Kesuburan Tanah dan Nutrisi Tanaman dan Laboratorium Biologi Tanah Fakultas Pertanian Universitas Padjadjaran. Percobaan dilaksanakan dari bulan November 2017 sampai dengan bulan Februari 2018. Hasil penelitian tidak menunjukkan adanya interaksi antara inokulan dan kompos rami terhadap efisiensi degradasi, populasi total fungi dan tinggi tanaman rami pada proses fitoremediasi limbah minyak bumi, serta tidak diperoleh jenis inokulan dan dosis kompos rami terbaik terhadap efisiensi degradasi, populasi total fungi, dan tinggi tanaman rami pada fitoremediasi limbah minyak bumi.

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