4,203 research outputs found
Study of Vegetative Growth and Disease Incidence of Shallots (Allium ascalonicum L.) At Several Hydroponic Vertical And Horizontal Planting Distances
No full text75 HalamanRinto Tumanggor 17.821.0023 Kajian Pertumbuhan Vegetatif dan Kejadian Penyakit Bawang Merah (Allium ascalonicum L.) Pada Beberapa Jarak Tanam Vertikal dan Horizontal Secara Hidroponik dibawah bimbingan bapak Prof. Dr. Ir. Ahmad Rafiqi Tantawi, M.S selaku ketua pembimbing dan ibu Dr. Ir. Suswati, MP selaku anggota pembimbing. Penelitian ini bertujuan untuk mengkaji pertumbuhan vegetatif pada pengaturan jarak tanam dan kejadian penyakit Bawang Merah (Allium ascalonicum L.) yang dilaksanakan dilaksanakan di kebun percobaan pondok nusantara yang beralamat di jalan balai desa marindal II , Komplek Perumahan Pondok Nusantara, Kecamatan Medan Amplas, Kabupaten Deli Serdang dengan ketinggian 25 mdpl. Penelitian dilaksanakan pada bulan april sampai juni 2021. Rancangan yang digunakan dalam penelitian ini adalah Rancangan Acak Lengkap (RAL) Non Faktorial yang terdiri dari 2 faktor perlakuan yaitu fakto jarak tanam vertikal (V) dan horizontal (H). Penelitian ini dilaksanakan dengan sebanyak 4 ulangan. Parameter yang diamati dalam penelitian ini adalah Tinggi tanaman (cm), jumlah daun, warna daun, jumlah anakan per rumpun, jumlah umbi per rumpun dan kejadian penyakit bawang merah. Adapun hasil yang diperoleh dari penelitian ini adalah pengaruh perlakuan jarak pada pengamatan Tinggi tanaman (cm), jumlah daun, warna daun, jumlah anakan per rumpun, dan jumlah umbi per rumpun berpengaruh tidak nyata sedangkan kejadian penyakit pada bawang merah sangat tinggi pada semua tanaman sehingga antar perlakuan jarak tanam tidak berpengaruh signifikan. Rinto Tumanggor 17.821.0023 “Study of Vegetative Growth and Disease Incidence ofred onion (Allium ascalonicum L.) at Several Hydroponic Vertical and Horizontal Planting Distances” under the guidance of Prof. Dr. Ir. Ahmad Rafiqi Tantawi, M.S as the head supervisor and Mrs. Dr. Ir. Suswati, MP as a member of the advisor. This study aims to examine vegetative growth Planting Distances and the incidence of red onion (Allium ascalonicum L.) disease which was carried out in the experimental garden of Pondok Nusantara which is located at Jalan Balai Desa Marindal II, Pondok Nusantara Housing Complex, Medan Amplas District, Deli Serdang with an altitude of 25 meters above sea level. The study was conducted in April to June 2021. The design used in this study was a non-factorial completely randomized design (CRD) consisting of 2 treatment factors, namely the vertical (V) and horizontal (H) spacing. This research was carried out with 4 replications. The parameters observed in this study were plant height (cm), number of leaves, leaf color, number of tillers per clump, number of bulbs per clump and incidence of shallot disease. The results obtained from this study were the effect of distance treatment on observations of plant height (cm), number of leaves, leaf color, number of tillers per clump, and number of bulbs per clump had no significant effect while the incidence of disease in Red Onion s is very high in all plants so that the Planting Distancesdoes not have a significant effect
On using Directional Information for Parameter Space Decomposition in Ellipse Detection
No full textIn this paper we use the parametric polar representation to extend the application of edge directional information from circle to ellipse extraction. As a result we obtain a mapping which decomposes the parameter space required for ellipse extraction into two independent sub-spaces and one final histogram accumulator. The mapping includes the tangent of the angle of the first and second directional derivatives. These tangents are computed by considering edge direction at two border points. We show that the use of gradient information for parameter space decomposition avoids the intensive point labelling imposed by geometric constraints used by other approaches
Large-scale patterns in turbulent Rayleigh-Bénard convection in very large aspect ratio cells
No full textLarge-scale patterns, which are well-known from the spiral defect chaos regime of thermal convection at Rayleigh numbers Ra 105. They are uncovered when the turbulent fields are averaged in time and turbulent fluctuations are thus removed. We apply the Boussinesq closure to calculate turbulent viscosities and diffusivities, respectively. The resulting turbulent Rayleigh number Ra_, that describes the convection of the mean patterns, is indeed in the spiral defect chaos range. Interestingly, the turbulent Prandtl numbers are smaller than one with 0:2 _ Pr_ _ 0:4 for Prandtl numbers 0:7 _ Pr _ 10. Finally, we demonstrate that these mean flow patterns are robust to an additional finite-amplitude side wall-forcing when the level of turbulent fluctuations in the flow is sufficiently high
Reynolds number effect on 3D turbulent offset jet reattaching to a free surface
No full textExperimental study was carried out to investigate the effect of Reynolds number on 3D offset jet reattaching to above free surface. Sharp edged square nozzle was used to produce the jets, and the measurements were performed at the following six different Reynolds numbers: 2300, 3700, 5100, 7900, 10300 and 11900. Detailed velocity measurements were made in the symmetry plane. From the PIV data, the mean velocity and turbulence statistics were obtained to study the effects of Reynolds number on the salient features of the jet flow. Preliminary results on streamwise mean velocity decay along the nozzle centerline, contours of streamwise mean velocity and Reynolds shear stress are presented herein
The Benefits of Being Economics Professor A (and not Z)
No full textAlphabetic name ordering on multi-authored academic papers, which is the convention in the economics discipline and various other disciplines, is to the advantage of people whose last name initials are placed early in the alphabet. As it turns out, Professor A, who has been a first author more often than Professor Z, will have published more articles and experienced afaster growth rate over the course of her career as a result of reputation and visibility. Moreover, authors know that name ordering matters and indeed take ordering seriously: Several characteristics of an author group composition determine the decision to deviate from the default alphabetic name order to a significant extent.performance measurement, incentives, economists, name ordering
<i>Entrenchment, wealth, power, and the constitution of democratic societies</i> by Paul Starr
No full textEntrenchment, Wealth, Power, and the Constitution of Democratic Societies, by Paul Starr, New Haven, CT: Yale University Press. 2019. 280 pages, hardcover.Why should we, as Management scholars and educators, care about a book on political diagnosis? The answer is twofold. First, the calibre of the author (Paul Starr), an awardee of both Bancroft and Pulitzer Prizes, a former policy advisor to the Clinton administration, and the author of The Transformation of American Medicine (1982), a book with a profound impact on American policy circles. Second, the core concept (entrenchment) of the book, and its potential to advance the process of institutional development, and the ways in which we can reform and change our institutions to better meet the current and pressing needs of the many, rather than preserve the unequal privileges of a few. In light of the geopolitical, social, and environmental pressures we see currently rising across the world (George, Howard-Grenville, Joshi & Tihanyi, 2016; Howard-Grenville, Buckle, Hoskins & George, 2014) there is no better time to examine whether and how we can address some of these grand challenges by reforming and improving our institutions
M.S. Kutorga and V.M. Vedrov: Conflict of Teacher and Student
No full textВ статье рассматривается конфликт между М.С. Куторгой и его учеником В.М. Ведровым. Исследуются причины конфликта, а также то влияние, которое он оказал на дальнейшую научную карьеру ученика. This article discusses the conflict between M.S. Kutorga and his student V.M. Vedrov. The author investigates the causes of the conflict and its impact on academic career V.M. Vedrov
Ultra-fast escape of a deformable jet-propelled body
No full textIn this work a cephalopod-like deformable body that fills an internal cavity with fluid and expels it to propel an escape manoeuvre, while undergoing a drastic external shape change through shrinking, is shown to employ viscous as well as mainly inviscid hydrodynamic mechanisms to power an impressively fast start. First, we show that recovery of added-mass energy enables a shrinking rocket in a dense inviscid flow to achieve greater escape speed than an identical rocket in a vacuum. Next, we extend the shrinking body results of Weymouth & Triantafyllou (J. Fluid Mech., vol. 702, 2012, pp. 470–487) to three-dimensional bodies and show that three hydrodynamic mechanisms must be combined to achieve rapid escape performance in a viscous fluid: added-mass energy recovery; flow separation elimination; and an optimized energy storage and recovery. In particular, we show that the mechanism of separation elimination achieved through rapid body shrinking, coordinated with the mechanism of recovering the initially imparted added-mass energy, is critical to achieving a high escape speed. Hence a flexible, collapsing body can be vastly superior to a rigid-shell jet-propelled body
AIEDAM thematic collection: a perspective on data-enabled design – design meet data science
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Internet of ThingsDesign, Organisation and Strateg
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