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J.C.Wheals,A.Turner,K.Ramsay,A.O Neill,J.Bennet,H. Fang,G.Davis 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The paper addresses the challenges of higher efficiency and lower cost than the current DCT from VW (DQ250) fitted with twin wet clutches and hydraulic control. Responsible for the design and supply of the Bugatti Veyron 7-DCT and controller. Ricardo now present some aspects of their ongoing R&D applied to the other end of the market for controlled ratio transmissions with powershift capability. The practical DCT concept is targeted at B/C class with engines up to 200 Nm with very different targets. The shan layout, meshes, and synchronization are standard: the rest of the transmission is targeted at high efficiency which is derived from two main areas: Dry clutches using a novel failsafe latching mechanism and Electrical Linear Actuators used for the clutches and shift-rails to eliminate hydraulics. Cost is reduced as a result of these mentioned devices, and the following features: Mechanical multiplexing of the linear actuators to control the entire transmission using three or potentially just two primary actuators and lubrication using carefully designed active splash channels which eliminate the need for a pump. Regarding what the driver notices, simulation and rig data suggests the combination of a friction material and the accuracy and frequency response of the linear actuation device will provide shin quality approaching that of a wet clutch system with hydraulics. Fuel economy simulation results are presented using rig-validated sub-system models to identify the magnitude of the savings from each of the design features leading to an overall improvement of 9% versus a conventional b\hydraulic DCT. Finally, the concept is shown packaged for a small EU car and a robust prediction is made of system cost.
Adaptation of Hybrid Maize to Greenbelt and Ironstone Plateau Agro-Ecologies of South Sudan
( Luka A. O. Awata ),( Susan A. Tokwiny ),( Innocent Kitara ),( Richard O. Zozimo ),( Victor S. Bennet ),( Cirino O. Oyiki ) 한국육종학회 2021 Plant Breeding and Biotechnology Vol.9 No.2
Maize is a major staple food and source of income for over 90% of the population in South Sudan however, average yield is very low (0.5-0.9 t/ha). Little research has been done on maize improvement in the country and farmers mainly depend on local and unimproved cultivars. Identification and release of adapted and high yielding hybrids may elevate average maize yield (t/ha) among the resource-poor farmers in the country. Improved maize hybrids from the region have not been tested under South Sudanese environments. Objectives of the study were to: (i) determine genotype by environment interactions among some regional maize genotypes; (ii) estimate genetic components and heritability for yield performances; and (iii) identify high yielding maize hybrids adapted to agroecologies of South Sudan. At least 48 maize genotypes including elite hybrids and open-pollinated varieties (OPV) adapted across sub-Saharan Africa and two local cultivars collected from local farmers in South Sudan were evaluated across five locations within greenbelt and ironstone plateau agro-ecologies over three years (2013-2015). Experiments were set up in a 12 × 4 alpha lattice design with 2 replications. Standard agronomic practices were followed and data recorded on yield traits and resistance to major diseases. Across locations and years analysis revealed significant differences among genotypes due to genotype and genotype × environment interactions (P ≤ 0.01). Significant variability (P ≤ 0.01) existed among the genotypes for yield stability across environments. The study identified hybrids SC719 (8.3 t/ha), KH500-22A (8.0 t/ha) and Longe 10H (7.9 t/ha) as the best and stable candidates.