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Abstract: Small aethalometers are frequently used to measure equivalent black carbon (eBC) mass concentrations in the context of personal exposure and air pollution mapping through mobile measurements (MM). The most widely used is the microAethalometer (AE51). Its performance in the laboratory and field is well documented, however, there is not sufficient data in the context of its performance in different environments. In this investigation, we present the characterization of the performance of the AE51 through field unit-to-unit intercomparisons (IC), and against a reference absorption photometer from three MM campaigns conducted in drastically different environments. Five IC parameters were considered: i) study area, ii) location of IC, iii) time of day, iv) duration of IC, and v) correction for the filter-loading effect. We can conclude that it is crucial where and how long the IC have been performed in terms of the correlation between the mobile and reference instruments. Better correlations (R2 > 0.8, slope = 0.8) are achieved for IC performed in rural, and background areas for more than 10 minutes. In locations with more homogenous atmosphere, the correction of the loading effect improved the correlation between the mobile and reference instruments. In addition, a newer microAethalometer model (MA200) was characterized in the field under extreme cold conditions and correlated against another MA200 (R2 > 0.8, slope ≈ 1.0), AE51(R2 > 0.9, slope ≈ 0.9), and a stationary Aethalometer (AE33) across all wavelengths (R2 > 0.8, slope ≈ 0.7). For MA200, the loading effect was more pronounced, especially at the lower wavelengths, hence the correction of the loading effect is essential to improve the correlation against the AE33. The MA200 and AE51 proved to be robust and dependable portable instruments for MM applications. Real-world quality assurance of these instruments should be performed through field IC against reference instruments with longer durations in areas of slowly changing eBC concentration.
Found in: ključnih besedah
Keywords: Portable instruments, Mobile monitoring, Black carbon, Instrument intercomparisons
Published: 15.09.2020; Views: 1862; Downloads: 169
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Abstract: Technology changes its facet quicker than anything else. Every few years there is a revolution that changes the way we perceive technology and the way it impacts our lives. Mobile commerce industry has been swiftly bringing about an alteration in how we access the wireless network and marks a shift from personal computers to mobile devices. This chapter gives an outline of mobile commerce and will discuss about the various frauds prevalent on the internet and on mobiles specifically, and ways in which it can be curbed. The purpose of this chapter will be to make readers aware of the different types of fraudulent activities that can occur due to m-commerce transactions and their possible solutions will be elaborated at the end. The work will be beneficial for the students as well as researchers to form a basic background about m-commerce, various risks associated with it and their possible solutions.
Found in: ključnih besedah
Summary of found: ...and the way it impacts our lives. Mobile commerce industry has been swiftly bringing about...
Keywords: mobile commerce, attacks, frauds, digital hacking
Published: 31.03.2021; Views: 1252; Downloads: 47
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Abstract: Easiness of public & tourist's travel within a city is an important task for central and State Government. They have to access a combination of public transport options like metros, trams, buses and private options like cabs services and hired vehicles. Delhi, being the capital city of India, enjoys the usage of public transport by millions of travelers. Currently all route information on mobile applications (be it public or private) are static in nature which does not recommend any route to follow. This paper proposes such an application where travelling gets easier based on real time route map generation for using public transport like Bus and Metro services. The client-server based 3-tier architecture has been used for the mobile application designing. The application scores high on ease of travelling and customization of the routes through recommendations as compared to static application.
Found in: ključnih besedah
Summary of found: ...of travelers. Currently all route information on mobile applications (be it public or private) are...
Keywords: M-governance, dynamic route map, Delhi tourism, public transport system, mobile application framework
Published: 16.07.2021; Views: 1195; Downloads: 120
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