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101.
Norman S. Allen Kenneth O. Fatinikun A.Keith Davies Barry J. Parsons Glyn O. Phillips 《Dyes and Pigments》1981,2(3):219-229
The photofading of two anthraquinone dyes has been studied in aqueous solution using ultraviolet-visible absorption spectroscopy and flash photolysis. The influence of alcohol concentration, pH, atmosphere, photosensitisers and stabilisers have been examined and these lead to some important conclusions on the mechanism of dye fading. Essentially, the results indicate the photoexcited triplet state of the dye undergoes a process of either electron or hydrogen-atom abstraction depending on the nature of the environment. Other factors such as aggregation and singlet oxygen also appear to play an important role in solution photofading. The relevance of these results to photofading in a polymeric phase is discussed. 相似文献
102.
M. Isabel Osendi Barry A. Bender David Lewis III 《Journal of the American Ceramic Society》1989,72(6):1049-1054
Mullite-SiC-whisker composites were prepared by powder processing using two commercial SiC whiskers. These composites were prepared by sintering rather than hot-pressing. A mulliteSlC-powder composite and a base line mallite material were also prepared for comparison with the two whisker composite materials. Fracture toughness measurements showed significant enhancement in only one of the whisker composite materials. The microstructure of the four materials was examined by scanning electron microscopy and transmission electron microscopy to assist in the explanation of the mechanical behavior of these composites. The examinations suggested that most of the toughening results from second-phase particles, with only limited toughening from effects associated with whiskers per se. In one case, higher toughness was partially associated with the formation of sialon phase by reaction with the whiskers and the furnace environment. 相似文献
103.
Liguo Huang Jidong Ge Barry Boehm Jian Lv 《International Journal of Software and Informatics》2010,4(1):101-119
Commercial organizations increasingly need software processes sensitive to busi-
ness value, quick to apply, supportive of multi-stakeholder collaboration, and capable of early
analysis for subprocess consistency and compatibility. This paper and a companion paper
\Applying Value-Based Software Process: An ERP Example" present our experience in ap-
plying a lightweight synthesis of a Value-Based Software Quality Achievement (VBSQA)
process and an Object-Petri-Net (OPN) based process model to achieve a stakeholder win-
win outcome for software quality achievement in an ERP software project in China. We
attempt to answer such questions as (1) whether it is possible to model various project
stakeholder perspectives using formal process modeling languages in a real-world project?
(2) how to make stakeholders synchronize and stabilize their value propositions, activities
and commitments as needed. The companion paper presents the VBSQA process and its
application to the ERP project; this paper presents the OPN-based process modeling and its
application. The application results of OPN process modeling conˉrmed that (1) the OPN-
based process model provided project managers with a synchronization and stabilization
framework for process activities, success-critical stakeholders and their value propositions;
(2) process visualization and simulation tools signiˉcantly increased management visibility
and controllability for the success of the software project. 相似文献
104.
Standard genetic algorithms (SGAs) are investigated to optimise discrete-time proportional-integral-derivative (PID) controller parameters, by three tuning approaches, for a multivariable glass furnace process with loop interaction. Initially, standard genetic algorithms (SGAs) are used to identify control oriented models of the plant which are subsequently used for controller optimisation. An individual tuning approach without loop interaction is considered first to categorise the genetic operators, cost functions and improve searching boundaries to attain the desired performance criteria. The second tuning approach considers controller parameters optimisation with loop interaction and individual cost functions. While, the third tuning approach utilises a modified cost function which includes the total effect of both controlled variables, glass temperature and excess oxygen. This modified cost function is shown to exhibit improved control robustness and disturbance rejection under loop interaction. 相似文献
105.
Barry D. Lewis 《Information Security Journal: A Global Perspective》2013,22(1):44-55
Abstract The basic premise of developing any information system is to increase efficiency and manage information in an improved manner. Based on the definitions above, an information system is “a group of devices or artificial objects serving a common purpose to communicate knowledge or intelligence.” Most information systems evolve from processes that either manipulate much information or rely on complex calculations. In other words, information systems are developed either to manage information or to manipulate it. Systems are meant to receive input, manipulate the input, and provide output. 相似文献
106.
Jeanbourquin D Sage D Nguyen L Schaeli B Kayal S Barry DA Rossi L 《Water science and technology》2011,64(5):1108-1114
Discharges of combined sewer overflows (CSOs) and stormwater are recognized as an important source of environmental contamination. However, the harsh sewer environment and particular hydraulic conditions during rain events reduce the reliability of traditional flow measurement probes. An in situ system for sewer water flow monitoring based on video images was evaluated. Algorithms to determine water velocities were developed based on image-processing techniques. The image-based water velocity algorithm identifies surface features and measures their positions with respect to real world coordinates. A web-based user interface and a three-tier system architecture enable remote configuration of the cameras and the image-processing algorithms in order to calculate automatically flow velocity on-line. Results of investigations conducted in a CSO are presented. The system was found to measure reliably water velocities, thereby providing the means to understand particular hydraulic behaviors. 相似文献
107.
Rossi L Rumley L Ort C Minkkinen P Barry DA Chèvre N 《Water science and technology》2011,63(12):2975-2982
Sampling is a key step in the analysis of chemical compounds. It is particularly important in the environmental field, for example for wastewater effluents, wet-weather discharges or streams in which the flows and concentrations vary greatly over time. In contrast to the improvements that have occurred in analytical measurement, developments in the field of sampling are less active. However, sampling errors may exceed by an order of magnitude those related to analytical processes. We proposed an Internet-based application based on a sampling theory to identify and quantify the errors in the process of taking samples. This general theory of sampling, already applied to different areas, helps to answer questions related to the number of samples, their volume, their representativeness, etc. The use of the internet to host this application facilitates use of theoretical tools and raise awareness of the uncertainties related to sampling. An example is presented, which highlights the importance of the sampling step in the quality of analytical results. 相似文献
108.
Natashia Boland Barry D. Hughes Liam T.G. Merlot Peter J. Stuckey 《Computers & Operations Research》2008
The most complete form of academic timetabling problem is the population and course timetabling problem. In this problem, there may be multiple classes of each subject, and the decision on which students are to constitute each class is made in concert with the decision on the timetable for each class. In order to solve this problem, it is normally simplified or decomposed in some fashion. One simplification commonly used in practice is known as blocking: it is assumed that the classes can be partitioned into sets of classes (or blocks) that will be timetabled in parallel. This restricts clashing to occur only between classes in the same block, and essentially removes the timetabling aspect of the problem, which can be carried out once the blocks are constituted and the classes populated. The problem of constituting the blocks and populating the classes, known as the course blocking and population problem, is nevertheless a challenging problem, and provides the focus of this paper. We demonstrate, using data provided by a local high school, that integer linear programming approaches can solve the problem in a matter of seconds. Key features include remodelling to remove symmetry caused by students with identical subject selection, and the observation that in practice, only integrality of the block composition variables needs to be enforced; the class population aspects of the model have strong integrality properties. 相似文献
109.
The Internet is full of unwanted traffic, from junk mail, to advertising and scams that pose as social media, to fake "clicks" on ads, to denial-of-service attacks against online services. Each type causes problems in one way or another, and network operators have to work hard to identify and eliminate unwanted traffic. This issue examines the overall problem, and presents a selection of research into mitigation. 相似文献
110.
A major problem in empirical software engineering is to determine or ensure comparability across multiple sources of empirical
data. This paper summarizes experiences in developing and applying a software engineering technology testbed. The testbed
was designed to ensure comparability of empirical data used to evaluate alternative software engineering technologies, and
to accelerate the technology maturation and transition into project use. The requirements for such software engineering technology
testbeds include not only the specifications and code, but also the package of instrumentation, scenario drivers, seeded defects,
experimentation guidelines, and comparative effort and defect data needed to facilitate technology evaluation experiments.
The requirements and architecture to build a particular software engineering technology testbed to help NASA evaluate its
investments in software dependability research and technology have been developed and applied to evaluate a wide range of
technologies. The technologies evaluated came from the fields of architecture, testing, state-model checking, and operational
envelopes. This paper will present for the first time the requirements and architecture of the software engineering technology
testbed. The results of the technology evaluations will be analyzed from a point of view of how researchers benefitted from
using the SETT. The researchers just reported how their technology performed in their original findings. The testbed evaluation
showed (1) that certain technologies were complementary and cost-effective to apply; (2) that the testbed was cost-effective
to use by researchers within a well-specified domain of applicability; (3) that collaboration in testbed use by researchers
and the practitioners resulted comparable empirical data and in actions to accelerate technology maturity and transition into
project use, as shown in the AcmeStudio evaluation; and (4) that the software engineering technology testbed’s requirements
and architecture were suitable for evaluating technologies and accelerating their maturation and transition into project use.
相似文献
Barry BoehmEmail: |