The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The core strategy for Chinese industries constructing global leadership is to improve the international competitiveness based on core technological innovation. One of the main problems in Chinese indigenous innovation process is the relative low proportion of basic research in R&D resources input, compared with the rapid growth of the total economy amount and R&D investment. There is an obvious...
Surface deformation of goaf is a complex non-linear process, which has a hidden, complexity, and long-term features. Before building the life or service facilities in the goaf, we must have evaluated the stability and residual. In this paper, a new idea was put forward for stability analysis and evaluation of goaf by multi-scale decomposition using EMD(Empirical Mode Decomposition) method. Case study...
Characteristics of subsidence have significant difference at different time scale. Subsidence of the active points on a first mining workface in a mining area was measured every other minute. Based on the data, characteristic of subsidence is analyzed using fractal theory and several conclusions are put forward. They are:(1) Subsidence has fractal feature at multi-time scale, and fractal dimension...
Characteristic of subsidence is significant different in different temporal scale. Subsidence of the active points on a first mining workface was measured every other minute using several methods, such as Level, Total Station, and GPS. Based on the data, several conclusions are put forward. They are:(1) Under a certain geological and mining condition, subsidence can't happen suddenly. (2) In small...
Fraction of green vegetation, f g is needed as one of regular parameters for vegetation cover analysis. The paper explores the potentials of deriving this variable from thermal mapper (TM) normalized difference vegetation index (NDVI) data considering the leaf area index (LAI) of agricultural field. Geometric, radiometric and atmospheric correction of the images were performed before further...
The feature points of skull location and mark is an important research aspect in computer-aided facial reconstruction and computer-aided photographic superimposition. Based on technique in the topology between feature points analyzing, an automatic localization and marking method for key points of skull is proposed. First, get the contour of skull based on image preprocess technique and calculate...
This paper proposes a mesh simplification method based on facial features region partition for the special three-dimensional facial mesh model. According to distribution of feature points, the face is divided into several parts consisting of critical feature regional and non-critical feature regional. This method adjusts different areas using different curvature values. This algorithm also uses edge...
At present, solder joints are widely used to bond chips to their substrates for electronic connection and packaging. Good wettability is an essential requirement to form electronic interconnects. In this paper, an image acquisition system was used to observe time-dependent contact angle variation of 96.5Sn-3.5Ag lead-free BGA solder ball on Cu substrate. The wetting dynamics of the solder materials...
Solder paste printability is one of the most critical properties in SMT (surface mount technology). Investigation has shown that poor solder paste printing results in various SMA (surface mount assembly) defectives. In this letter, a novel solder paste printability tester has been constructed with a characteristic "squeegee-roller" print motion, in which the roller served as an "annular...
The most urgent issue on the way of popularizing the smart labels is cutting their cost. Various ways have been explored to approach this goal, but the cost of a smart label is still hanging around decades of cents. Attaching a RFID flip chip on a paper or plastic substrate is one of the most competitive technologies for low cost smart label manufacturing. Anisotropically conductive adhesive (ACA)...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.