26 research outputs found

    Respons Pertumbuhan Dan Produksi Bawang Merah (Allium Ascalonicum L.) Terhadap Dosis Pupuk NPKMg Dan Jenis Mulsa

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    This research has been conducted to obtain dose of NPKMg and the kind of mulchs which can improve the growth and production of the shallot. This research had been conducted at Simalingkar B Medan in June-September 2015 using factorial randomized block design with two factors, dose of NPKMg (no NPKMg, 2, 4. 6, and 8 g/shallot) and the kind of mulch (no mulch, black silver mulch, and straw of rice mulch). Parameter observed were plant length, number of leaves per clump, number of tillers per clump, diameter of the bulbs per sample, wet bulb weight per sample, dry bulb weight per sample, wet bulb weight per plot, and dry bulb weight per plot. The results showed that aplication of NPKMg manure significantly affected parameter plant length 6-7 MST, not significantly affected other parameters. Aplication of the kind of mulch significantly affected plant length 2-8 MST, number of leaves per clump 2-3 MST, number of tillers per clump 3 MST, wet bulb weight per plot, and dry bulb weight per plot yet not significantly affected other parameters. Interaction between aplication of NPKMg and the kind of mulch not significantly affected on all parameters of observation

    The James Webb Space Telescope Mission

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    Twenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least 4m4m. With the support of their governments in the US, Europe, and Canada, 20,000 people realized that vision as the 6.5m6.5m James Webb Space Telescope. A generation of astronomers will celebrate their accomplishments for the life of the mission, potentially as long as 20 years, and beyond. This report and the scientific discoveries that follow are extended thank-you notes to the 20,000 team members. The telescope is working perfectly, with much better image quality than expected. In this and accompanying papers, we give a brief history, describe the observatory, outline its objectives and current observing program, and discuss the inventions and people who made it possible. We cite detailed reports on the design and the measured performance on orbit.Comment: Accepted by PASP for the special issue on The James Webb Space Telescope Overview, 29 pages, 4 figure

    Electrochemical influence of nano-spherical RuO2.xH2O thin film on nickel adhesion layer as an anode via short-time pulse current technique for energy storage in rechargeable batteries

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    A crystalline Sb–Cu alloy is investigated for use in Li-ion rechargeable batteries, and its structural, electrochemical and thermal properties are characterized. A pulse electrodeposition method is used to prepare Sb–Cu alloy film on Cu foil as a negative electrode. The structure of the alloy film electrode is characterized using XRD, FE-SEM and EDX. The electrochemical behavior of the Sb–Cu alloy film is investigated at the current rate of 0.1C to the cut-off potential range of 1.8 and 0.01 V vs. Li/Li+. Our experimental results demonstrate that the initial discharge capacity is 850 mAh g−1 and that the discharge capacity increases to 1034 mAh g−1 at the end of the 30th cycle with a stable cycle life. The Coulombic efficiency is approximately 83.5% with good cyclability. Moreover, the crystalline Sb–Cu alloy film has relatively low exothermic properties, and it may be an interesting candidate for use in the negative electrodes of Li-ion batteries

    Development of nano-spherical RuO2 active material on AISI 317 steel substrate via pulse electrodeposition for supercapacitors

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    The goal of the present study is to develop a thin film hydrous ruthenium oxide (RuO2) electrode material on Ni flashed AISI 317 stainless steel (SS) substrate by pulse electrodeposition (PED) technique for application in supercapacitors. The nickel (Ni) strike thin film is deposited prior to RuO2 in order to improve the adhesion of the active material on the SS substrate. The prepared RuO2 active material on Ni strike SS electrode is characterized using XRD, SEM with EDAX and electrochemically using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) using an IVIUM reference potentiostat. The surface morphologies of the thin film (thickness of 2.3 ÎŒm) active materials are nano-spherical shaped and the particles are arranged uniformly without cracks on the SS substrate. The electrochemical impedance and CV profile demonstrates its superior characteristics in the electrochemical system. Moreover, the specific capacitance of RuO2 value is approximately 520 F g− 1 at the scan rate of 1 mV s− 1 and it's indicating a better utilization of active species in supercapacitors

    The vertebral nerve: A comprehensive review of its form and function.

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    The literature is littered with variable and scant reports of the vertebral nerve. The present paper reviews the literature regarding this nervous structure of the neck and attempts to clarify a number of issues surrounding its form, function, and implications of surgical manipulation. The nerve may arise from the stellate ganglion or the ansa subclavia, amongst a number of other structures. Additionally, the terminal insertion of the vertebral nerve varies in the reported literature, with authors observing various terminations. Animal models of the vertebral nerve have limited value, as variations between species and with species have been observed. This review also indicates that contradictory evidence exists regarding the clinical implications of vertebral nerve damage. Although irritation may result in ocular disturbance, hearing loss, headaches, and dizziness, a high degree of incongruity exists around whether or not any clinical findings will actually be observed. Based on our review of the available literature and recent cadaveric research, it appears it may be more logical to classify the vertebral nerve as a variable ramus communicans that connects the stellate or inferior cervical ganglia to the lower cervical spinal nerves and not a structure that ascends entirely with the vertebral artery to enter the cranium

    Direct multiple-point geostatistical simulation of edge properties for modeling thin irregularly-shaped surfaces

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    Thin irregularly-shaped surfaces such as clay drapes often have a major control on flow and transport in heterogeneous porous media. Clay drapes are often complex curvilinear 3-dimensional surfaces and display a very complex spatial distribution. Variogram-based stochastic approaches are often also not able to describe the spatial distribution of clay drapes since complex, curvilinear, continuous and interconnected structures cannot be characterized using only two-point statistics. Multiple-point geostatistics aims to overcome the limitations of the variogram. The premise of multiple-point geostatistics is to move beyond two-point correlations between variables and to obtain (cross) correlation moments at three or more locations at a time using "training images" to characterize the patterns of geological heterogeneity. Multiple-point geostatistics is able to reproduce thin irregularly-shaped surfaces such as clay drapes but is often computationally intensive. To capture the thin surfaces, a small grid cell size should be adopted for the training image. This results in large training images and a large search template size and thus a large CPU and RAM demand (Huysmans and Dassargues, 2009)
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