oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 67 )

2018 ( 510 )

2017 ( 506 )

2016 ( 587 )

Custom range...

Search Results: 1 - 10 of 12471 matches for " AIT-ICSS Algorithm "
All listed articles are free for downloading (OA Articles)
Page 1 /12471
Display every page Item
On Detecting Sudden Changes in the Unconditional Volatility of a Time Series  [PDF]
Dilip Kumar
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.62028
Abstract: The present study highlights the drawback of using Sanso, Arago and Carrion’s (2004) AIT-ICSS algorithm in detecting sudden changes in the unconditional volatility when long memory is present in volatility. Simulation experiments show that the AIT-ICSS test is severely oversized and exhibits low power when long memory is present in volatility.
Unexpected Volatility Shifts and Efficiency of Emerging Stock Market: The Case of Malaysia
Elgilani Eltahir Elshareif,Hui-Boon Tan,Mei-Foong Wong
Business Management Dynamics , 2012,
Abstract: This paper analyzed the behavior of Malaysian stock market during the intervals of high uncertainty. It highlighted the impact of unexpected volatility shifts on this small emerging Asian market, in terms of its efficiency and returns, during the past two decades. The purpose of this study was achieved through the Iterated-Cumulative-Sum-of-Squares-in-Volatility model (ICSS-EGARCH-M Model), which is one of the new approaches in market efficiency studies. The empirical results indicated the rejection of Efficient Market Hypothesis for the market when sudden volatility shifts were considered. The results also provided significant empirical evidences for positive risk-return relationship in the exchanges. In addition, the stock market was found to be more sensitive to global than local events. The asymmetrical responses to good and bad news were also part of the market behavior.
Development of Mathematical Model of CARDD Cotrol System for Irrigation Canals Integrated with ICSS Model and Evaluated for Standard Test Cases of ASCE
M. J. Monem,S. P. Ahmadpanah1
Journal of Science and Technology of Agriculture and Natural Resources , 2012,
Abstract: There are different automatic downstream control algorithms developed to increase the flexibility of the irrigation system. CARDD control logic is one of the heuristic and distance automatic downstream control systems. In this research, mathematical model of the CARDD control logic coordinated with ICSS hydrodynamic model was developed and the CARDD control logic was tested and evaluated under different situations. In order to evaluate the performance of this control algorithm, one of the canals suggested by ASCE (canal number 2) was used. The CARDD control algorithm was tested under the operational scenarios suggested by ASCE in which the control algorithm was evaluated by intense and gradual flow changes in a newly constructed (tuned) canal. Performance indicators were calculated and analysed. In the case of gradual flow changes, the maximum diversion of the water depth from the target was about 5% and was always in permitted range. In intense flow changes, the maximum diversion of the water depth from the target was about 8% and it was recovered in about 1 hour, which is a considerable time. The charts showing the variation of water depth at each turnout and the calculated performance indicators showed the satisfactory performance of CARDD control algorithm in gradual flow changes. In intense flow changes, although the maximum variation of the water depth was limited, the system response time was relatively long.
In Vitro and in Vivo Efficacy of an Experimental Compound against Rhipicephalus (Boophilus) microplus Ticks  [PDF]
Guadalupe Santillán-Velazquez, Froylán Ibarra-Velarde, Blas Flores Pérez, Margarita Romero-Avila, Yazmin Alcalá-Canto, Héctor Salgado-Zamora, Yolanda Vera Montenegro
Pharmacology & Pharmacy (PP) , 2013, DOI: 10.4236/pp.2013.41005
Abstract: The aim of the present study was to evaluate the ixodicide efficacy of the experimental compound 712-BF-016 against Rhipicephalus (Boophilus) microplus ticks in vitro and in cattle. The in vitro efficacy was initially tested against R. Boophilus microplus larvae using the Larval Packet Test (LPT). In a 2nd study the ixodicide efficacy was tested against adult ticks using the Adult Inmersion Test (AIT). Finally, a field test with the compound was carried out using 24 steers experimentally infested with R. (Boophilus) microplus ticks which were divided into 4 groups of 6 animals each for treatment. Groups 1 and 2 received the experimental compound at concentrations of 16% and 20%, respectively, which were applied as an aspersion in a total volume of 4 liters/animal. Group 3 was equally treated but with a commercial ixodicide containing cipermethrin at a 16% concentration. Group 4 served as untreated control. The efficacy was measured on days 1, 2, 3 after treatment as the percentage of ticks present from the treated groups, relative to the ticks present in the untreated control. The results indicated a percentage mortality of 93.21% for LPT and 98.02% for AIT. The efficacy produced in cattle was 61.78%, 76.43% and 85.34% for groups 1, 2 y 3, respectively. It is concluded that there was no concordance between the results obtained in vitro with those found in cattle. Possibly the excipient used for the formulation of the experimental compound was not suitable and had some influence on the results.
PHARMACOGNOSTICAL AND PHYTOCHEMICAL INVESTIGATION OF EUPHORBIA PROSTRATA AIT.
Surendra Kr. Sharma et al.
International Journal of Pharmaceutical Sciences and Research , 2012,
Abstract: Euphorbia prostrata Ait.(Euphorbiaceae) is a small, prostrate, annual green herb sometime purple tint in colour. It is widely distributed globally and used as antihemorrhoidal, anti-inflammatory, analgesic, hypolipidemic, antidiabetic, antidirroheal, antiasthmatic and for various skin diseases. The microscopy of root shows the presence of obliterated cork cells, phelloderm, cortex, endodermis, phloem, medulary rays and xylem; the stem shows the presence of multicellular trichome, cuticle, epidermis, cortex, endodermis, pericycle, phloem, latex canal, xylem and pith; the leave reveal the presence of multicellular, multiseriate glandular hairs, epidermis, vascular bundles, stomata anomocytic and anisocytic. The vein islet number and vein termination number have also been determined. The powder study reveals the presence of epidermal cells, trichomes, parenchymatous cells, pollen grains, vessels, fibers and stomata. The water soluble, alcohol soluble and petroleum ether extractive values were determined. The total ash, water soluble ash, acid insoluble ash and sulphated ash were also observed. Preliminary phytochemical studies revealed the presence of flavonoids, tannins, glycosides and saponins in the alcoholic extract of the plant. This is the first report on pharmacognostical studies on this plant.
Geomorphosite Valorization a View to Sustainable Development: Case of Ait Hajji, Oued Boulahmayel Valley, Central Morocco  [PDF]
Nahraoui Fatima Zahra, El Wartiti Mohamed, Zahraoui Mohamed, Dabi Sanaa
Journal of Geographic Information System (JGIS) , 2011, DOI: 10.4236/jgis.2011.31002
Abstract: The Pleistocene Fluvial-lacustrine of Ait Hajji Formation is located in South East of Tiddas, and in the Qua-ternary deposits of the Moroccan Central Plateau. These outcrops represent on a geomorphosite of great im-portance for the study of geological heritage, and for a natural eco-tourism valorization in Morocco. For to aim a natural tourism promotion, for indigenous peoples, this geomorphosite in question has an fluorescent and dense flora with a diversified fauna in the heart of one Ordovician quartzite bar and Devonian limestone ridges. In Oued Boulahmayel geomorphosite contains a memory geological Formation of a Pleistocene epi-sode, beginning firstly by a dynamic fluviatil land synchronous with a local volcanic activity (Phonolite ne-phelinc) replaced by a lake sedimentation related to the formation of a dam natural, created a few hundred meters downstream from Boulahmayel. For valorizing of the hinterland of the plains towns, it is necessary to develop a geo-eco-tourism integrated who provide its harvest and will argue the benefits resources of rural people of high-mountains in their own environment. It is proposed in the perspective to initiate a sustainable development approach, while ensuring the conservation and ensure the continued natural existence of the surroundings environments and to appreciate the potential of the region. Thus that beauty hidden in the hin-terland upstream to a tourist eager for discoveries, to encourage them to practice their stay as short as it is, in a safe space and very quiet. In order to materialize the concept of geo-eco-tourism, we must deploy the ef-forts of local people, policy makers and scientists in order to produce tourist maps with different interesting routes, to implant signal panels, to develop tracks campsites and trails within the forests, creating shelters and rest houses in private homes, as well as provide training for specialized guide’s rescuers.
The Effect of Wide-Range Photosynthetic Active Radiations on Photosynthesis, Growth and Flowering of Rosa sp. and Kalanchoe blossfeldiana  [PDF]
Leiv M. Mortensen
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.511164
Abstract:

Miniature roses (Rosa sp.) and Kalanchoe blossfeldiana were grown at photon flux densities (PFD) ranging from 60 to 670 μmol·m-2·s-1 (associated with a temperature gradient from 20.0°C to 24.0°C [TEMP1]) and from 50 to 370μmol·m-2-s-1 (associated with a temperature gradient from 22.5°C to 26.5°C [TEMP2]). The experiment was conducted in a greenhouse compartment at latitude 59° north in mid-winter. The daily photosynthetic active radiations (PAR) ranged from 4.3 to 48.2 and 3.6 to 26.6 mol·m-2·day-1 in the TEMP1 and TEMP2 treatments, respectively. Time until flowering in miniature roses decreased from about 50 to 35 days in the TEMP1 treatment and from 50 to 25 days in the TEMP2 treatment, when the PFD increased from 50 to 370μmol·m-2·s-1. In Kalanchoe time until flowering was decreased to the same extent (about 15 days) in both temperature treatments when PFD increased from 50 to 370 μmol·m-2·s-1. The number of flowers and the plant dry weight in miniature roses increased up to 300 – 400 μmol·m-2·s-1 PFD (21.6 - 28.8 mol·m-2 day-1 PAR), while flower stem fresh weight and plant dry weight in Kalanchoe increased up to 200 – 300 μmol·m-2·s-1 at TEMP1. Measurements of the diurnal carbon dioxide exchange rates (CER) in daylight in small plant stands of roses in summertime showed that CER was saturated at about 300 μmol·m-2·s-1 PFD at 370

Effect of Ionic Liquids as the Mobile Phase Additives on the HPLC Resolution of Four Active Compounds from Sophora flavescens Ait
Minglei Tian,Junyu Liu,Kyung Ho Row
Molecules , 2009, DOI: 10.3390/molecules14062127
Abstract: The retention behaviour of four active compounds from Sophora Flavescens Ait using three ionic liquids as mobile phase modifiers was examined. The effect of the pH and the amount of ionic liquid modifier on the retention of these compounds was determined in methanol/water (v/v) as the mobile phase containing different ionic liquids ranging in concentration from 0.1 mmol/L to 3.0 mmol/L. The ionic liquids showed promise as additives in high-performance liquid chromatography.
Genetic Control of Growth, Wood Density and Stem Characteristics of Pinus pinaster in Portugal
Aguiar,Alexandre; Almeida,Maria Helena; Borralho,Nuno;
Silva Lusitana , 2003,
Abstract: a pinus pinaster ait. progeny trial involving 46 open pollinated families was established at two locations in portugal (leiria and escaroupim). height, diameter, pilodyn and stem characteristics (straightness, branch size and number of whorls) were assessed at age 5 and 12 and were used to estimate variance components, heritability, phenotypic and genetic correlations between traits. estimates varied considerably between the two sites. however, this study indicates that the heritability for height followed the general pattern of increasing with the age of the trees. a strong and favourable genetic correlation between the stem form and branching was also found. heritability of pilodyn was very low, suggesting that measurements taken at age 12 were not a reliable measure of wood density, probably due to the high proportion of juvenile wood.
Long-term implications of traditional forest regulation methods applied to Maritime pine (Pinus pinaster Ait.) forests in central Spain: a century of management plans
Bravo F,Osorio LF,Pando V,Del Peso C
iForest : Biogeosciences and Forestry , 2010, DOI: 10.3832/ifor0526-003
Abstract: Pinus pinaster stands in the northern Iberian range (Spain) have been under forest management plans for more than a century. The main goals have been sustainable yield and conservation and enhancement of forest conditions. In the study area, forest management plan implementation started to be effective in the late 19th and early 20th centuries and the plans have been evaluated every ten years. In these forests, a permanent forest compartment method has been applied as the management system. Different regeneration methods have been applied (uniform shelterwood and clear cutting in Soria, selective and uniform shelterwood and continuous cover forestry in Teruel). To analyse the evolution of each forest group, five management indicators have been tested in this study: number of merchantable trees, standing volume, resin production, allowable yield, and harvested volume. Forest situation improvement and maintenance of forest integrity are not only a consequence of the actions planed by foresters, they are also influenced by socio-economic transformations that have occurred during the last century such as the weakness of the resin market, decreasing demand for fire wood, restriction of pasture activities, and increasing recreation use.
Page 1 /12471
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.