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.
Luminescence investigations of ZnO films covered by Ag films using different pumping sources revealed thatinfluence of Ag films on the intensity of ZnO films luminescence depends on excitation conditions and Ag covering quality.
We demonstrate that azimuthally polarized micro-ring THz quantum-cascade lasers can be coupled to hollow metallic waveguides with efficiencies ≥96% and perfectly matched with the TE01 waveguide mode, giving attenuation losses < 3dB/m. The use of Ag coated-flexible pipe waveguides allows propagation of either vertically polarized or azimuthally polarized QCL beams with propagation losses as low...
This paper presents a 16-Gb/s 45-nm SOI CMOS transceiver for multi-standard backplane applications. The receiver uses a 12-tap DFE with circuit refinements for supporting higher data rates. Both the receiver and the transmitter use dynamic adaptation to combat parameter drift due to changing supply and temperature. A 3-tap FFE is included in the source-series-terminated driver. The combination of...
GSM-based positioning technology is more suitable for navigation than GPS in urban, indoor and even underground areas. However, it cannot be used for automotive navigation due to its large positioning error (more than 100m). This paper presents an approach utilizing fractal analysis and wavelet transform to enhance GSM-based positioning accuracy. Fractal theory and analysis is introduced into the...
We propose signal processing algorithms to improve the quality of the images obtained with microwave raster scanning measurements. These algorithms include: (1) blind deconvolution and (2) microwave holography. The first algorithm removes the integration effect of the antenna aperture using complex-valued blind deconvolution. The second algorithm implements near-field microwave holographic imaging...
Void growth in wire bonds significantly influences the reliability of electronic devices. This paper found that, in the as-bonded state, a few voids nucleate in Au-Al bonds, while they are absent in Cu-Al bonds. Voids grow much faster in Au-Al bonds than in Cu-Al bonds during thermal annealing. It is proposed that void growth in Au-Al bonds due to the oxidation of IMCs and volumetric shrinkage resulted...
Five sampling areas which represent traffic center, industrial area, commercial area, residential area and the suburb were set in NanChang city to collect Inhalable Particulate (PM10) samples in summer and winter of 2007. The data at various sampling areas illustrated that the Polycyclic Aromatic Hydrocarbons (PAHs) concentration of PM10 in summer were lower than that in winter. In different areas...
Schottky diode structures with Ge quantum dots (QDs) have been grown by Molecular Beam Epitaxy (MBE). They have been employed to fabricate NiSi Schottky diodes with Ge dots buried below the metal-semiconductor junctions. These diodes have cut-off frequencies up to 1.1 THz (calculated from S-parameter measurements up to 110GHz). Preliminary results demonstrating the implementation of Ge QD Schottky...
A novel micromachined thermopile IR detector module with filter and detector cointegrated by wafer level Au-Au vacuum bonding is presented in this paper. Filter is directly bonded on the IR detector to miniaturize the detector module, as well as reduce the packaging cost. Because the gas convection will be eliminated in vacuum, a better thermal isolation can be achieved for the vacuum packaged IR...
We discuss a number of practical issues in measurements with the recently proposed microwave raster scanning setup for near-field imaging of tissue. We consider the uncertainties in the measurements of phantoms emulating biological tissues. We discuss improvements in the design of sensors tailored for this application. We evaluate the performance of a tissue sensing sensor in terms of a parameter...
Process induced variation of contact resistance (Rc) in Ti/graphene (single or multi-layer) devices is investigated physically and electrically. It is proposed that the increased Rc can be attributed to the carbon defects (vacancies) created during SPUTTER process, which is evidenced by Raman spectra. For the first time, the asymmetric behaviors in hole and electron transportation regions in different...
Plasmon coupling of dimers of Ag nanoparticles is studied by the EELS as shown in Fig 1a [1]. The spectroscopic images in the above Fig. 1a are extracted from 2.8eV, 3.4eV and 3.6eV respectively, where one can see the preferable exciting points of the features around the Ag nanoparticles. With the aid of DDA calculation(Fig. 1b), the three features are identified as the in-phase plasmon coupling,...
We present a differential Near-field Scanning Optical Microscope (NSOM) operating with subwavelength resolution in the THz spectral region. The system, which employs a quantum cascade laser emitting at λ =105 μm as source, has been been tested on metal and graphite objects, with a resolution of ~ λ/10.
Contents of soil organic matter (SOM) and total nitrogen (TN) were measured in Nanjishan wetland of Poyang Lake, China, in 2009. Three types of soil from Ass. Triarrhera lutarioriparia , Ass. Carex cinerascens and Ass. Eleocharis valleculosa were analyzed along water gradients. Results showed that spatial distributions of both SOM and TN were very similar in soil profiles (0-100 cm) of the three areas...
High-order functions are the sole elements in a class of recursive functions. The functions are related to each other through application, i.e., applying a function to an argument yields a value where the argument and the value are also functions. Through Froglingo, a language that exactly takes advantage of high-order functions and their properties, we introduce the method of representing business...
A 32nm RF SOC technology is developed with high-k/metal-gate triple-transistor architecture simultaneously offering devices with high performance and very low leakage to address advanced RF/mobile communications markets. A high performance NMOS achieves an fT of 420GHz. Concurrently, a low leakage 30pA/um NMOS achieves an fT of 218GHz. Deep-nwell/guard rings improves noise isolation by >50dB. High...
The mechanical behaviors of two kinds of hydrogenated Ti-6Al-4V alloy were investigated in quasi-static (material testing machine) and dynamic (split Hopkinson pressure bar) compression test. The stress-strain curves were obtained over the range of strain rates from 10-3s-1 to 1.5×103 s-1 and temperatures from 20°C (room temperature) to 700°C. The strain rate and temperature sensitivity of plastic...
The effect of ultrasonic energy on the interfacial microstructure in Cu-Al bonds is investigated to establish a relationship between ultrasonic energy, interfacial structure and bonding strength. It is shown that formation of intermetallic compounds (IMCs) at a Cu/Al interface is strongly dependent on the character of ultrasonic vibration; higher levels of ultrasonic energy enhance fragmentation of...
The work presented in this paper focuses on a) clarifying the underlying physical failure mechanism of Sn-rich solder interconnections under thermomechanical loading and b) identifying the means to accelerate the failure mechanism by optimizing the dwell-times and ramp-rates of thermal cycling test. The statistical results showed that as the dwell-times were decreased the number of cycles to failure...
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.