39 research outputs found
Infeksi Cucumber mosaic virus dan Chilli veinal mottle virus pada Cabai di Kabupaten Rejang Lebong, Bengkulu
No full textMosaic disease caused by Cucumber mosaic virus (CMV) and Chilli veinal mottle Virus (ChiVMV) has been distributed widely in chilli in Indonesia and considered as important disease. A research was conducted to investigate the spread and incidence of CMV and ChiVMV in Rejang Lebong, Bengkulu and to identify its insect vector. Symptomatic and asymptomatic leaf samples were collected systematically from several chillipepper fields for further detection by DAS-ELISA (Double antibody sandwich-enzyme linked immunosorbant assay) using specific antibody for CMV and ChiVMV. The result showed that infection of both CMV and ChiVMV was found with disease incidence reached 20-50%, whereas infection only by ChiVMV or CMV were 50-80% and 20-50%, respectively. One species of aphid, i.e. Aphis gossypii was found from the fields.
Key words: Aphis gossypii, CMV, ChiVMV, disease incidenc
On the Solution of the Extended Linear Complementarity Problem
No full textThe extended linear complementarity problem (XLCP) has been introduced in a recent paper by Mangasarian and Pang. In the present research, minimization problems with simple bounds associated to this problem are defined. When the XLCP is solvable, their solutions are global minimizers of the associated problems. Sufficient conditions that guarantee that stationary points of the associated problems are solutions of the XLCP will be proved. These theoretical results support the conjecture that local methods for box constrained optimization applied to the associated problems could be efficient tools for solving the XLCP. Keywords. Complementarity, box constrained minimization. AMS: 90C33, 90C30 Department of Computer Science and Statistics, University of the State of S. Paulo (UNESP), C.P. 136, CEP 15054-000, S~ao Jos'e do Rio Preto-SP, Brazil. This author was supported by FAPESP (Grant 96-1552-0, 96/12503-0). E-mail: [email protected] y Department of Mathematics, I..
La relazione tra il comportamento del consumatore e le circostanze d’acquisto
No full textMarket segmentation has always had a very important place in the marketing literature.
Accordingly, within the last few years, a number of new developments have emerged in
market segmentation. This paper discusses the importance of studying consumer behaviour in
term of the contingency situations in which consumption behaviour occur. In other word, the
apparently random purchasing (by the same person) of different product in different situations
is explained, by a new market segmentation variable: the contingency variable. The author
encourages, also, the utilization of sensemaking in the study of consumer behaviour
Constant-Rank Condition and Second-Order Constraint Qualification
No full textThe constant-rank condition for feasible points of nonlinear programming problems was defined by Janin (Math. Program. Study 21:127-138, 1984). In that paper, the author proved that the constant-rank condition is a first-order constraint qualification. In this work, we prove that the constant-rank condition is also a second-order constraint qualification. We define other second-order constraint qualifications.Fil: Andreani, R.. Universidade Estadual de Campinas; BrasilFil: Echagüe, C. E.. Universidad Nacional de La Plata; ArgentinaFil: Schuverdt, María Laura. Universidad Nacional de La Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentin
On the reformulation of nonlinear complementarity problems using the Fischer-Burmeister function
No full textA bounded-level-set result for a reformulation of the box-constrained variational inequality problem proposed recently by Facchinei, Fischer and Kanzow is proved. An application of this result to the (unbounded) nonlinear complementarity problem is suggested. Keywords. Complementarity, unconstrained minimization, reformulation. AMS: 90C33, 90C30 1 Main results Given F : IR n ! IR n , F 2 C 1 (IR n ), the box-constrained variational inequality problem (BVIP) consists on finding x 2\Omega such that hF (x); z \Gamma xi 0 for all z 2\Omega ; (1) where\Omega is the compact box \Omega = fx 2 IR n j ` x rg: (2) The Nonlinear Complementarity Problem (NCP) is the problem (1) when\Omega = fx 2 IR n j x 0g. Department of Computer Science and Statistics, University of the State of S. Paulo (UNESP), C.P. 136, CEP 15054-000, S~ao Jos'e do Rio Preto-SP, Brazil. This author was supported by FAPESP (Grants 96/1552-0 and 96/12503- 0). E-mail: [email protected]..
KEMELIMPAHAN NEMATODA PATOGEN SERANGGA (NPS) PADA LAHAN PERTANIAN SEMI ORGANIK DAN KONVENSIONAL, DAN EFEKTIFITASNYA DALAM MEMBUNUH LARVA Spodoptera litura F.
No full textInsect pathogenic nematodes (NPS) is a group of soil fauna that can be used for management of crop pests in agricultural ecosystems that are environmentally friendly. NPS is widespread in the world and lived in many terrestrial ecosystems. Management system for agricultural
crops and environmental differences edafik alleged influence on the existence and life of NPS in the field. Unclear what factors cause such a difference, but the effect of pesticides and / or fertilizers may reduce the abundance of NPS in agricultural ecosystems are managed
conventionally managed agricultural ecosystems semiorganik may be able to provide environmental conditions that do not hit, even a combination of organic fertilizer and inorganic food availability may lead to more optimal NPS. The purpose of this research to study the effects of agricultural land management systems in conventional and organic semi against NPS abundance, and to study the effectiveness of NPS in killing insect pests Spodoptera litura, NPS from agricultural ecosystems with conventional management systems and semi-organic. The results showed that agricultural land managed organically semi NPS
has a higher abundance compared with farms managed conventionally. Semi-organic farmland has an a verage abundance of NPS 2 times higher than that of conventional land JI 43.66 g-1 , whereas abundance of land NPS conventional JI 15.33 g-1. In testing the
effectiveness of Steinernema obtained from semi-organic farms and conventional equally effective in shutting down the test insect Spodoptera litura but tend to be more effective coming from semi-organic land. Therefore, the use of external inputs such as fertilizers and high-energy chemical insecticides should be reduced
Potential Of Aqueous Extracts From Weeds And Food Crops In Oil Palm Plantations As Bioherbicides
No full textPurpose: This study aims to test water extracts derived from weeds and plants in oil palm plantations on the germination of test plants. The extract was prepared from June to July 2024 in Arga Makmur, North Bengkulu Regency, and the bioassay test was conducted from July to August 2024 in Pematang Gubernur, Muara Bangkahulu, Bengkulu City. Methodology: The study used a single-factor, completely randomized design. Twenty-one treatments were applied, namely, the source of extracts from broadleaf weeds, grass weeds, and teki weeds of 5 types each, as well as the control. The experimental unit was a Petri dish, and the experiment was repeated four times. The petri dish bioassay method was applied in this experiment. Each petri dish was given 10 mL of water extract, and 25 mung bean seeds of the Vima 2 variety were planted and incubated for three days. Results: The results showed that water extracts derived from weeds and plants in oil palm plantations significantly affected almost all variables. Findings: Water extracts that inhibit the germination of the highest test plants come from broadleaf weeds, namely Ageratum conyzoides, Chromolaena odorata, Stenochlaena palustris, Wedelia trilobata, and Amaranthus sp. Food crop groups are Oryza sativa, Manihot esculenta, Ipomoea batatas, and Vigna radiata. Grass weeds were Leersia hexandra and Eleusine indica, and no weeds were in the weed class. Novelty: This study provides insight into the potential of allelopathy sourced from weeds and food crops. Originality: This study offers a detailed analysis of the bioherbicidal effects of weed and food crop extracts on seed germination or test plants. Conclusion: Aqueous extracts of broadleaf weeds dominated the inhibition of seed germination and have great potential as bioherbicides. Document type: empirical research article.
Keywords: weeds; oil palm plantations; extract sources; food crops; bioherbicide
Lettera intorno alla sferistica, o sia, Giuoco alla palla degli antichi /
No full textSignatures: A-F⁸.Place and printer from colophon. Date is that of imprimatur.Mode of access: Internet.Binding, c. 2: coarse gray paper. Author and title "Lettera Intorno alla Sferistica" written on spine. Edges roughly trimmed.Binding, c. 1: coarse gray paper. Title "Giuco alla Palla" and author written on spine. Edges roughly trimmed. Bookplate of Sormani Andreani Verri
Realization of high-Q/V photonic crystal cavities defined by an effective Aubry-André-Harper bichromatic potential
No full textWe report on the realization of high-Q/V
photonic crystal
cavities in
thin silicon
membranes, with resonances around 1.55 μm wavelength. The cavity designs are based
on a recently proposed photonic
crystal implementation of the Aubry-André-Harper bichromatic potential,
defined from the superposition of two one-dimensional lattices with a non-integer ratio
between their periodicity constants. In photonic crystal nanocavities, this confinement mechanism
is such that optimized figures of merit can be straightforwardly achieved, in particular
an ultra-high-Q factor and diffraction-limited mode volume. Several silicon membrane photonic crystal nanocavities
have been realized with measured
Q-factors in the 1 × 106 range, as evidenced by resonant scattering. The
generality of the proposed designs and their easy implementation and scalability make
these results particularly interesting for realizing highly performing photonic nanocavities on
different material
platforms and operational wavelengths
