167 research outputs found
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
Generic and complete vehicle dynamic models for open-source platforms
No full textVehicle dynamics models are important tools for research and development within
the automotive industry. The need for such models is steadily rising due to the
rapid development of automated driving, as these models allow efficient design and
development of the control algorithms and functions. Chalmers Revere Lab supplements
research in the field of automated driving and collision avoidance. The lab
maintains two test vehicles, a passenger car (Volvo XC90) and a heavy duty truck
(6x4 Volvo FH16). The models provided by Volvo are confidential, complicated for
implementation as reference models and do not share the same control interface as
the test vehicles. The objective of this work is to develop well documented generic
and complete open-source models that represent Revere’s test vehicles.
The thesis aims to develop three model units per test vehicle. The three model
units are a control interface model, a quick simulation model for online prediction
and an advanced model for offline simulation prior to track testing. In addition to
model development, an investigation has been made on the level of modelling details
suitable for automated driving for non-critical highway and city driving on dry
asphalt. For instance, a clutch model was implemented to capture the behaviour of
starting from a standstill for the test vehicle equipped with an automated manual
transmission. The models were developed using Modelica, an object-oriented modelling
tool, and Matlab/Simulink. Furthermore, a suitable model architecture was
proposed for simulation of automated driving functions.
To assess the validity of the models, the simulation results were compared against
experimental data. Data was collected using open-loop test maneuvers and manual
driving tests. The simulation results highlight the differences between the simple
and advanced model and their accuracy with respect to experimental data. As a
use-case, the XC90 advanced model was simulated with a GPS-based autonomous
navigation controller. Validation with experimental data showed that the vehicle
model is suitable for the development of control algorithms. The simple model
is faster than real-time making it suitable for online prediction and the advanced
model is real-time capable which was verified with real-time toolbox on Simulink.
As a suggestion for future work, the tire model can be improved to handle low-speed
parking scenario and a trailer-dolly combination can be added to the tractor model
for studies on combination vehicles
New synthesis of 2,2 '-heteroarylpyrroles from heteroarylchlorocarbenes
No full text2,2'-Pyridyl- and 2,2'-thienylpyrroles containing substituents at the 1- and 3-positions of the pyrrole ring have been prepared from the reaction of heteroarylchlorocarbenes with 1-azabuta-1,3-dienes. Laser flash photolysis of heteroarylchlorocarbene in isooctane in the presence of 1-azabuta-1,3-diene yields an azomethine ylide (lambda=550 nm) as an intermediate. The kinetic parameters for the ylide formation and further 1,5-intramolecular cyclization to the pyrrole ring have been determined. (C) 1999 Elsevier Science Ltd. All rights reserved.PT: J; CR: BAIRD MS, 1990, J CHEM RES M, P946 ENGEL N, 1978, ANGEW CHEM INT EDIT, V17, P676 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 KATRITZKY AR, 1994, SYNTHESIS-STUTTGART, P93 KOROSTOVA SE, 1989, KHIM GETEROTSIKL+, P901 KOTKAR D, 1988, J CHEM SOC CHEM COMM, P917 KOZAKI M, 1996, J ORG CHEM, V61, P3657 LIU MTH, 1994, INT J CHEM KINET, V26, P1179 LUCCHESINI F, 1992, TETRAHEDRON, V48, P9951 MOSS RA, 1987, J AM CHEM SOC, V109, P4341 MOSS RA, 1992, TETRAHEDRON LETT, V33, P1427 NAITOH S, 1986, J CHEM SOC CHEM COMM, P1348 PATIL AO, 1988, CHEM REV, V88, P183 ROMASHIN YN, 1999, CHEM COMMUN 0307, P447 RONCALI J, 1992, CHEM REV, V92, P711 WALTMAN RJ, 1986, CAN J CHEM, V64, P76 ZELIKIN A, 1999, J ORG CHEM, V64, P3379; NR: 17; TC: 11; J9: TETRAHEDRON LETT; PG: 3; GA: 236PXSource type: Electronic(1
Third-order nonlinear optical properties of 1,3-bis(3,4-dimethoxyphenyl) prop-2-en-1-one under femtosecond laser pulses
No full textAn investigative and evaluative study of factors affecting quality of agricultural and farm information services in Kerala
No full textAgriculture is not only a country’s backbone of food, livelihood and ecological security systems, but is also the very soul of its sovereignty. In Kerala population density is high and land is scarce. To achieve sustainable advancement in quality of human life, meeting the domestic food requirement is to be given foremost priority in development plans. As the area of cultivation cannot be increased and growth of population cannot be controlled growth in food production is to be achieved by qualitative improvement in farming. This requires improvements in material inputs, farming techniques, storage technology and research. Effective integration of these factors is tied closely to adequate information flow, which can be ensured only by an efficient information system for agricultural education, research, extension and development. So evaluation and improvement of existing information services is very crucial for sustainable agricultural growth. The study evaluates the existing information resources, facilities, services, possibilities for resource sharing, accessibility of external sources, and the factors that affect the quality and efficiency of information services in agricultural sector. Coverage is limited to the State of Kerala. Sample consist 105 institutions of different levels, and information users consisting of 426 scientists and 220 farmers. Different sets of questionnaires and interview schedule were used to elicit information. The study found that agricultural research conducted at various institutions in the region at huge public expense has generated knowledge for improving production. Along with these huge collections of acquired content is also stored in the sector. But when a farmer, an extension worker, a scientist or an administrator needs information it is not easily accessible. The study found that agricultural sector fails to effectively bank on information resources available due to the lack of an information system and network. Recommends an Agricultural and Farm Information System for Kerala. Suggests a model plan for a computer communication network for resource sharing between the agricultural institutions in the State, which will also ensure, smooth flow of results of research down to the grassroots level to achieve maximum productivity in agriculture
Steady state and time resolved methods of fluorescence quenching of heterocyclic compound in dioxane solvent using linear S-V plots
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