Pembuatan Alat Percobaan Manometer Terbuka Untuk Menentukan Nilai P0 Berdasarkan Hukum Boyle

Telah dibuat alat percobaan manometer terbuka untuk mengukur tekanan atmosfer suatu tempat. Alat ini terbuat dari selang plastik dengan diameter 0,8 cm dan panjang 1,3 m. Yang disangga tiang kayu yang memiliki tinggi 75 dan papan alas berukuran 25 x 30 cm. Sebagai isian selang digunakan raksa sebesar 0,34 ml. Selang plastik ini direkatkan pada tiang penyangga yang dilengkapi mistar untuk menunjukkan panjang kolom udara dan perbedaan ketinggian permukaan raksa pada kedua kaki selang. Salah satu ujung selang tertutup. Untuk pengkalibrasian alat ini dilengkapi dengan waterpass yang disangga dua buah klem C. Hal ini dimaksudkan agar titik pengkalibrasian alat tidak hanya pada satu titik saja. Pengujian alat ini dilakukan dengan memvarisi panjang kolom udara sehinga terdapat perbedaan ketinggian permukaan raksa pada kedua ujung selang. Hasil pengukuran menunjukkan prosentase kesalahan antara 4,61 % - 16,76 % jika dibandingkan dengan hasil pengukuran menggunakan barometer. Melihat hasil tersebut, manometer terbuka ini dikategorikan layak untuk membelajarkan Hukum Boyle dan sebagai alat ukur sederhana utuk menentukan nilai tekanan atmosfer

ANALISIS FAKTA CERITA DALAM FOLKLOR LISAN: CERITA RAKYAT SUNDA SEBAGAI PEMBELAJARAN SASTRA DI SEKOLAH DASAR

Folklore is one of the sastra literature that can be used as teaching materials to help students recognize local wisdom. Sastra Literature can also function as a medium of learning and entertainment to foster emotions in students. Oral literature is literature that includes expressions of the citizens of a culture caused and passed down by oral literature (by word of mouth). As part of culture, oral literature cannot be separated from the influence of values that live and develop in society. These positive values can shape children's character and can foster a love for regional culture. Oral literature can also introduce the culture of the archipelago to students. This study seeks to contribute to literary learning in elementary schools, in this case oral folklore in Sundanese folklore can be used as a source of literary learning material so that folklore can be used as an alternative source of teaching materials by teachers during the learning process. The facts of the story contained in the oral folklore of Sundanese folklore are; plot, characterizations, and setting

Peningkatan Kemampuan Pemahaman Matematis Siswa melalui Pembelajaran Kooperatif Teknik Kancing Gemerencing dan Number Head Together

The method that used of this research is quasi experiment make use of two classes, quasi experiment I and quasi experiment II. The population is all of sevent grade students at SMPN 5 Garut period 2014/2015, and the sample is H-sevent grade as quasi experiment I who get kancing gemerincing learning and F-sevent grade as quasi experiment II who get NHT learning with purposive sampling. The purposive sampling is sampling based on certain considerations. The instrument of this research is mathematical understanding skill test and questionnaire. Based on the result of research, known that: (1) found the difference increased of mathematical understanding skill students between who get strategy cooperative learning technique Numbered Head Together (NHT) and kancing gemerincing, (2) the increased quality of mathematical understanding skill quasi experiment I students with technique kancing gemerincing is enough, (3) the increased quality of mathematical understanding skill quasi experiment II students with technique NHT is enough, (5) the student were gived their positive attitude to technique kancing gemerincing, (5) the student were gived their positive attitude to technique NHT, but they were gived their negative attitude to equipping of LKS

Identifikasi Dan Prevalensi Endoparasit Pada Usus Ikan Bawal Air Tawar (Colossoma Macropomum) Kolam Budidaya Di Desa Nya, Kecamatan Simpang Tiga, Kabupaten Aceh Besar

The Purpose of this study were to identify the type of endoparasite and to find out the prevalance of endoparasite infected digestive tract of Colossoma macropomum. The study was conducted at parasitology Laboratory of Veterinary Medicine Faculty, Syiah Kuala University in May - June 2015. The sample used were collected randomly. As many as 10% of total fish in a population. The exa mination of endoparasite were carried out using smear method. Parameter measured were prevalence and physic – chemical of water. The results showed that type of endoparasite found in digestive tract of Colossoma macropomum fish was Capillaria sp. with the prevalence of 15%. Tujuan penelitian ini untuk mengidentifikasi jenis endoparasit yang menginfeksi dan mengetahui prevalensi endoparasit yang menginfeksi saluran pencernaan ikan bawal air tawar. Penelitian dilakukan di Laboratorium Parasitologi Fakultas Kedokteran Hewan, Universitas Syiah Kuala pada Bulan Mei dan Juni 2015. Penelitian menggunakan metode smear method dan penyamplingan sampel dilakukan secara acak. Sampel yang digunakan dalam penelitian sebanyak 10% dari total ikan dalam satu populasi. Parameter yang diukur yaitu prevalensi dan parameter fisika – kimia air. Hasil dari penelitian menunjukkan bahwa jenis endoparasit yang teridentifikasi pada ikan bawal air tawar adalah Capillaria sp. Nilai prevalensi yang diperoleh sebesar 15%

Effect of plant biomass, manure and inorganic fertilizer on maize yield in the central Highlands of Kenya

Soil fertility degradation remains the major biophysical cause of declining per capita crop production on smallholder farms in sub-Saharan Africa. Appropriate soil fertility regimes, are therefore, critical for improved crop productivity. This study investigated the feasibility of using sole organics or their combinations with inorganicfertilisers to improve maize (Zea mays) production in the highlands central Kenya. Sole application of Calliandra calotyrsus, Leucaena trichandra trichandra, Mucuna pruriens, Crotalaria ochroleuca, Tithonia diversifolia and cattle manure at 60 kg N ha-1 or combined application of the organic materials (30 kg N ha-1) plus inorganic fertiliser (30 kg N ha-1) gave significantly (P < 0.05) higher maize grain yields than the recommended rate of inorganic fertiliser (60 kg N ha-1). These treatments maintained maize yields at 4 to 6 t ha-1. Farmers had theirown innovations where they combined organic resources and generally appreciable yields (3.0 to 5.6 t ha-1) were obtained from these innovations. However, there was a maize yield gap between on station and on farm trials with on station yields having on average 65% more yields than the on-farm yields. This was mainly attributedto differences in management practices arising from partial adoption of recommended rates. There is need therefore to develop and implement mechanisms tailored to ensure that farmers’ modications recommended soil amendment regimes and other agronomic practices are appropriate for enhanced crop productivity. Further studies are needed to establish the optimum mixture of different organic materials

Simulations of the Nuclear Recoil Head-Tail Signature in Gases Relevant to Directional Dark Matter Searches

We present the first detailed simulations of the head-tail effect relevant to directional Dark Matter searches. Investigations of the location of the majority of the ionization charge as being either at the beginning half (tail) or at the end half (head) of the nuclear recoil track were performed for carbon and sulphur recoils in 40 Torr negative ion carbon disulfide and for fluorine recoils in 100 Torr carbon tetrafluoride. The SRIM simulation program was used, together with a purpose-written Monte Carlo generator, to model production of ionizing pairs, diffusion and basic readout geometries relevant to potential real detector scenarios, such as under development for the DRIFT experiment. The results clearly indicate the existence of a head-tail track asymmetry but with a magnitude critically influenced by two competing factors: the nature of the stopping power and details of the range straggling. The former tends to result in the tail being greater than the head and the latter the reverse.Comment: 22 pages, 12 figures, submitted to Astroparticle Physic

Low Energy Electron and Nuclear Recoil Thresholds in the DRIFT-II Negative Ion TPC for Dark Matter Searches

Understanding the ability to measure and discriminate particle events at the lowest possible energy is an essential requirement in developing new experiments to search for weakly interacting massive particle (WIMP) dark matter. In this paper we detail an assessment of the potential sensitivity below 10 keV in the 1 m^3 DRIFT-II directionally sensitive, low pressure, negative ion time projection chamber (NITPC), based on event-by-event track reconstruction and calorimetry in the multiwire proportional chamber (MWPC) readout. By application of a digital smoothing polynomial it is shown that the detector is sensitive to sulfur and carbon recoils down to 2.9 and 1.9 keV respectively, and 1.2 keV for electron induced events. The energy sensitivity is demonstrated through the 5.9 keV gamma spectrum of 55Fe, where the energy resolution is sufficient to identify the escape peak. The effect a lower energy sensitivity on the WIMP exclusion limit is demonstrated. In addition to recoil direction reconstruction for WIMP searches this sensitivity suggests new prospects for applications also in KK axion searches

Asphericity of a length four relative presentation

We consider the relative group presentation P = where X = { x \} and R = { xg_1 xg_2 xg_3 x^{-1} g_4 }. We show modulo a small number of exceptional cases exactly when P is aspherical. If the subgroup H of G is given by H = then the exceptional cases occur when H is isomorphic to one of C_5,C_6,C_8 or C_2 X C_4

Extinction Maps Toward The Milky Way Bulge: Two-Dimensional And Three-Dimensional Tests With APOGEE

Galactic interstellar extinction maps are powerful and necessary tools for Milky Way structure and stellar population analyses, particularly toward the heavily reddened bulge and in the midplane. However, due to the difficulty of obtaining reliable extinction measures and distances for a large number of stars that are independent of these maps, tests of their accuracy and systematics have been limited. Our goal is to assess a variety of photometric stellar extinction estimates, including both two-dimensional and three-dimensional extinction maps, using independent extinction measures based on a large spectroscopic sample of stars toward the Milky Way bulge. We employ stellar atmospheric parameters derived from high-resolution H-band Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectra, combined with theoretical stellar isochrones, to calculate line-of-sight extinction and distances for a sample of more than 2400 giants toward the Milky Way bulge. We compare these extinction values to those predicted by individual near-IR and near+mid-IR stellar colors, two-dimensional bulge extinction maps, and three-dimensional extinction maps. The long baseline, near+mid-IR stellar colors are, on average, the most accurate predictors of the APOGEE extinction estimates, and the two-dimensional and three-dimensional extinction maps derived from different stellar populations along different sightlines show varying degrees of reliability. We present the results of all of the comparisons and discuss reasons for the observed discrepancies. We also demonstrate how the particular stellar atmospheric models adopted can have a strong impact on this type of analysis, and discuss related caveats.NSF Astronomy & Astrophysics Postdoctoral Fellowship AST-1203017Physics Frontier Center/Joint Institute for Nuclear Astrophysics (JINA) PHY 08-22648U.S. National Science FoundationAlfred P. Sloan FoundationParticipating InstitutionsU.S. Department of Energy Office of Science ANR-12-BS05-0015-01Astronom