Detector of alpha particles and x-rays operating in ambient air in pulse counting mode or/and with gas amplification

Ionization chambers working in ambient air in current detection mode are widely used in several applications such as smoke detection, dosimetry, therapeutic beam monitoring and cetera. The aim of this work was to investigate if gaseous detectors can operate in ambient air in pulse counting mode as well as with gas amplification. . To investigate the feasibility of this method two types of open- end gaseous detectors were build and successfully tested. The first one was a single wire or multiwire cylindrical geometry detector operating in pulse mode at a gas gain of 1. The second type alpha detector was an innovative GEM-like detector with resistive electrodes operating in air in avalanche mode at high gas gains (up to 10E4). A detailed comparison between these two detectors is given as well as comparison with the commercially available alpha detectors. The main advantages of gaseous detectors operating in air in a pulse detection mode are their simplicity, low cost and high sensitivity. One of the possible applications of these new detectors is alpha particle background monitors which, due to their low cost can find wide application not only in houses, but in public areas: airports, railway station and so on

Performance of wire-type Rn detectors operated with gas gain in ambient air in view of its possible application to early earthquake predictions

We describe a detector of alpha particles based on wire type counters (single-wire and multiwire) operating in ambient air at high gas gains (100-1000). The main advantages of these detectors are: low cost, robustness and ability to operate in humid air. The minimum detectable activity achieved with the multiwire detector for an integration time of 1 min is 140 Bq per m3, which is comparable to that featured by commercial devices. Owing to such features the detector is suited for massive application, for example for continuous monitoring of Rn or Po contaminations or, as discussed in the paper, its use in a network of Rn counters in areas affected by earth-quakes in order to verify, on a solid statistical basis, the envisaged correlation between the sudden Rn appearance and a forthcoming earthquake

Progress in the development of a S RETGEM-based detector for an early forest fire warning system

In this paper we present a prototype of a Strip Resistive Thick GEM photosensitive gaseous detector filled with Ne and ethylferrocene vapours at a total pressure of 1 atm for an early forest fire detection system. Tests show that it is one hundred times more sensitive than the best commercial ultraviolet flame detectors and therefore, it is able to reliably detect a flame of 1.5x1.5x1.5 m3 at a distance of about 1km. An additional and unique feature of this detector is its imaging capability, which in combination with other techniques, may significantly reduce false fire alarms when operating in an automatic mode. Preliminary results conducted with air filled photosensitive gaseous detectors are also presented. The approach main advantages include both the simplicity of manufacturing and affordability of construction materials such as plastics and glues specifically reducing detector production cost. The sensitivity of these air filled detectors at certain conditions may be as high as those filled with Ne and EF. Long term test results of such sealed detectors indicate a significant progress in this direction. We believe that our detectors utilized in addition to other flame and smoke sensors will exceptionally increase the sensitivity of forest fire detection systems. Our future efforts will be focused on attempts to commercialize such detectors utilizing our aforementioned findings.Comment: Presented at the International Conference on Micropattern gaseous detectors, Crete, Greece, June 200

Study on Public Participation in Urban Planning in China

公众参与城市规划是政治民主化的重要体现，有利于实现规划的科学性，确保规划的有效实施，其最终目的是通过对城市规划中存在的非市场失灵的补充与修正，保证城市规划的公平性与公正性，实现公众利益的最大化，促进社会发展。本文综合运用了文献资料法、比较分析法和实证研究法等多种研究方法，力图对我国城市规划中的公众参与进行全面、系统而深入的分析和探讨，以期为我国公众参与城市规划作出一点有价值的研究。全文主体共分为三个部分：第一部分：比较分析了我国不同时期对城市规划概念的不同理解，总结了我国城市规划的变化趋势，论述了城市规划的含义；通过分析《城市规划法》，论述了城市规划的基本属性——公共政策属性；论述了城市规划的...Public participation in urban planning is the important embodiment of Politics democratization, is also the guarantee of making urban planning scientific and putting it into practice successfully. The final goal of public participation in urban planning is according to the supplement and revision in view of non-market failure which exists to urban planning itself, guaranteeing the fairness of urba...学位：管理学硕士院系专业：公共事务学院公共管理系_行政管理学号：20040601

The network structure of visited locations according to geotagged social media photos

Businesses, tourism attractions, public transportation hubs and other points of interest are not isolated but part of a collaborative system. Making such collaborative network surface is not always an easy task. The existence of data-rich environments can assist in the reconstruction of collaborative networks. They shed light into how their members operate and reveal a potential for value creation via collaborative approaches. Social media data are an example of a means to accomplish this task. In this paper, we reconstruct a network of tourist locations using fine-grained data from Flickr, an online community for photo sharing. We have used a publicly available set of Flickr data provided by Yahoo! Labs. To analyse the complex structure of tourism systems, we have reconstructed a network of visited locations in Europe, resulting in around 180,000 vertices and over 32 million edges. An analysis of the resulting network properties reveals its complex structure.Comment: 8 pages, 3 figure

Some aspects of recent developments on functional trivalent chromium.

International audienc

Le conclusioni della llla conferenza internazionale su cromo duro e decorativo e presentazione di un nuovo metodo chimico di purificazione e riciclo di bagni spenti di cromo esavalente.

International audienc

Hard thick trivalent chromium electrolytic process : toward an industrial application

International audienc

Hard thick trivalent chronium plating : some aspects of the present and the future.

International audienc