交通视频监控系统中TMS320DM642与嵌入式PC/104+模块的通信

描述了TI公司媒体处理器TMS320DM642HPI的主要特点，介绍了PCI桥接器PCI2040的结构原理，提出了通过PCI2040实现TMS320DM642与PC／104＋模块进行通信的设计方案。本方案充分利用PCI总线的高数据吞吐能力和DSP的HPI接口功能，可在DSP和PC／104＋模块之间实现较高的数据传输率，实现了PC／104＋实时读／写DSP任意片内存储单元的内容。最后给出交通视频监控系统的设计方案，详细说明了通信过程的软件编程。     

Advanced light ion source extraction system for a new electron cyclotron resonance ion source geometry at Saclay

One of the main goal of intense light ion injector projects such as IPHI, IFMIF, or SPIRAL2, is to produce high current beams while keeping transverse emittance as low as possible. To prevent emittance growth induced in a dual solenoid low energy transfer line, its length has to be minimized. This can be performed with the advanced light ion source extraction system concept that we are developing: a new ECR 2.45 GHz type ion source based on the use of an additional low energy beam transport (LEBT) short length solenoid close to the extraction aperture to create the resonance in the plasma chamber. The geometry of the source has been considerably modified to allow easy maintenance of each component and to save space in front of the extraction. The source aims to be very flexible and to be able to extract high current ion beams at energy up to 100 kV. A specific experimental setup for this source is under installation on the BETSI test bench, to compare its performances with sources developed up to now in the laboratory, such as SILHI, IFMIF, or SPIRAL2 ECR sources. This original extraction source concept is presented, as well as electromagnetic simulations with OPERA-2D code. Ion beam extraction in space charge compensation regime with AXCEL, and beam dynamics simulation with SOLMAXP codes show the beam quality improvement at the end of the LEBT.     

Wavelength Dependence of Photo Multiplier. Single Electron Response Amplitude Spectra

A study of the 56 AVP photomultiplier has shown that the single electron response amplitude spectrum depends on the wave length of the detected photons. In fact, for 6700 A light a high quality spectrum i.e. presenting a strong maximum, may be obtained by applying well chosen voltages to the first dynode and by using the positive focusing bias recommended by the manufacturer. A continuous degradation of the spectrum is observed when the wavelength decreases from 6700 ? to 3100 ?; for blue light there is no maximum anymore. It was found that for an illumination of the central area of the photocathode, the spectra for blue light may be markedly improved by running the focusing electrode at a negative bias with respect the photocathode. Results concerning peak to valley type figures of merit of the spectra are shown vs. focusing voltage and for various wavelengths the implications of these observations are discussed. It seems that these phenomena are not specific of the 56 AVP as analogous results were observed on the recent 2106 phototube.     

Mechanism of the Reduction by Ammonia of Nitrates Stored onto a Pt–Ba/Al2O3 LNT Catalyst

The mechanism involved in the formation of N₂ and of N₂O during the reduction of nitrates stored onto a Pt–Ba/Al₂O₃ LNT catalyst is investigated using labeled NO and unlabeled ammonia, in the presence and in the absence of NO in the gas phase. The reduction of the stored NO _x species (labeled nitrates) with NH₃ leads to the selective formation of N₂. Based on the isotopic distribution, it appears that N₂ formation occurs primarily through the statistical coupling of N-atoms formed by dissociation of NO and NH₃ at metal Pt sites. When the reduction of the stored nitrates is carried out in the presence of NO in the gas phase, NO is preferentially reduced. This implies that the rate determining step of the reduction of nitrates by ammonia is likely associated with the release of stored NO _x . Negligible amounts of nitrous oxide have been observed during the NH₃-TPSR with adsorbed nitrates, whereas relevant quantities of N₂O have been detected at low temperatures (below 180 °C) in the runs performed in the presence of NO in the gas phase. The data converge to indicate that N₂O formation involves the presence of gaseous NO and this suggests that the formation of nitrous oxide occurs either through the coupling of two adsorbed NO molecules or the recombination of an adsorbed NO molecule with an adsorbed NH _x species.     

External uncertainty factors and LCC: a case study

Life cycle cost (LCC) is a significant consideration in any decision-making process. Although a body of knowledge exists on LCC in construction, little exists on the uncertainties during the operational period. A case study of French high-rise social housing is examined to identify some factors causing uncertainty. The historical data from these buildings are analysed to estimate the impact of some external factors (functional changes, technological changes, and regulatory changes) on the life cycle cost. New formulae for integrating this impact into the calculation of LCC are proposed and cost indicators are suggested for the LCC evaluation of similar buildings. The findings are a step towards a higher level of reliability in LCC evaluation taking account of some usually unexpected uncertainty factors.

Le coût du cycle de vie (CCV) est un facteur important à prendre en considération dans tout processus de prise de décision. Bien qu'un corpus de connaissances existe sur le CCV dans l'industrie du bâtiment, il y a peu de choses sur les incertitudes pendant la période d'exploitation. Une étude de cas sur le logement social dans les grands ensembles français est examinée afin d'identifier certains facteurs qui sont sources d'incertitude. Les données historiques provenant de ces immeubles sont analysées afin d'estimer l'impact de certains facteurs extérieurs (changements fonctionnels, changements technologiques et changements réglementaires) sur le coût du cycle de vie. De nouvelles formules permettant d'intégrer cet impact dans le calcul du CCV sont proposées et il est suggéré des indicateurs de coût pour l'évaluation du CCV d'immeubles similaires. Les résultats constituent un pas vers un niveau accru de fiabilité dans l'évaluation du CCV, tenant compte de certains facteurs d'incertitude généralement imprévus.

Mots clés: gestion d'actifs, entretien d'immeubles, gestion globale de bâtiments, logement, coût du cycle de vie (CCV), durée, incertitude     

A review on transportation of heat energy over long distance: Exploratory development

This paper presents a review on transportation of heat energy over long distance. For the transportation of high-temperature heat energy, the chemical catalytic reversible reaction is almost the only way available, and there are several reactions have been studied. For the relatively low-temperature heat energy, which exists widely as waste heat, there are mainly five researching aspects at present: chemical reversible reactions, phase change thermal energy storage and transportation, hydrogen-absorbing alloys, solid–gas adsorption and liquid–gas absorption. The basic principles and the characteristics of these methods are discussed.     

A Knowledge-Based System for Construction-Site Organization

Abstract: This paper presents an example of a knowledge-based system application in the domain of building design, specifically for construction-site management. This type of system is a reasonable approach for providing a design aid to engineers. The object-oriented representation that is the base of the prototype GRAM_V2 was developed by the authors from an analysis of the specific needs for a building computer-aided design (CAD) system. This hybrid language integrates several functionalities such as multiple representation, delegation, and a set of graphic classes. The system architecture promotes adaptability, ease of use, and evolution of the system over time. GRAM_V2 utilizes AUTOCAD as a graphic interface and an object-oriented language developed in LISP. This paper emphasizes the formalism and explains the utility of the different functionalities of GRAM_V2 through this specific application.     

激光催陈食醋技术

用激光催陈食醋,用气相色谱法和化学分析法对催陈食醋进行了香气成分、氨基酸、总酸、总酯、色度等多方面的分析,结果表明:激光催陈对食醋的色、香、味均有明显提高,达到了食醋传统贮存陈酿的目的。