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 Jiudian Gorge water conservancy hub at the Tao River in Gansu Province is located at the entrance of the Jiudian Gorge in the middle reaches of the Yellow River tributary, Tao River. The project has a total capacity of 943 million m3 and is an all-year balancing reservoir. Under normal water level conditions, the maximum water depth in front of the dam is 103 m. The water temperature structure...
A quarter-rate 51Gb/s PAM4 CDR with decoded dual-NRZ outputs is presented for 400GbE optical transceivers. A baud-rate data-only sampling PD with zero-crossing integrating front-end is proposed to minimize the clock generation and distribution overhead, as well as improving the noise resilience under PAM4 low-SNR inputs. Measurement results show the CDR features 1.08ps RMS clock jitter, 3.4×10−9 PAM4...
We evaluate two designs of dual-wavelength DFB-QCLs for high-resolution multi-species laser absorption spectrometers. Several room-temperature dual-wavelength QCLs were combined to measure concentrations of the most important pollutants and greenhouse gases in a compact laser spectrometer with state-of-the-art precision.
State-of-the-art sensing methods only exploit three dimensions of the spectrum space: frequency, time and geography whereas the angle dimension, that is, spatial spectrum sensing has not been exploited well enough. In this paper, we apply the multiple signal classification (MUSIC) Angle of Arrival (AoA) estimation method into spectrum sensing. Note that MUSIC method needs to know the number of signals,...
This paper presents a DC/AC compact model for double-gate (DG) tunnel field-effect transistors (TFET) which is based on a unified analytical modeling framework. The closed-form model shows a good agreement with both, TCAD simulations and measurements on test structures. A Verilog-A implementation allows for a quick performance evaluation of the DC performance of logic cells. Results of a complementary...
Radio frequency identification (RFID) is a technology for automated identification of objects and people. RFID technology is expected to find extensive use in applications related to the Internet of Things, and in particular applications of Internet of Battlefield Things. Of particular interest are passive RFID tags due to a number of their salient advantages. Such tags, lacking energy sources of...
In order to overcome the drawbacks of the traditional frame-difference method that is used in moving target detection, and to achieve both accurate and robust detection result, a novel approach for moving objects detection based on improved Canny edge detection and adaptive frame difference method is proposed in this paper. Firstly, select the threshold value of three-frame difference method adaptively...
Self-folding is capable of forming complex three-dimensional structures from planar sheets. However, existing self-folding machines cannot generate large forces or bear high loads. In contrast, traditional robots are expected to operate under large loads but these robots are generally dense, resulting in heavy machines with relatively low strength-to-weight ratios. In this paper, we present a new...
The traction force of any moving object on a floor is the frictional force between the object and the floor. Therefore, investigation of the frictional constraint is very important for such moving object on a floor as well as a biped walking robot. Conventionally, the study of frictional constraint of a biped robot was only constrained in translational slip, without considering rotational slip, which...
With the rapid growth of the economy, air pollution becomes increasingly serious and environment protection has attracted more attention. It is a fact that ships produce enormous air pollution emissions with high energy consumption and research has been constantly carried out on clean energy applications. LNG as an alternative clean marine fuel to run on ships is still at an initial stage. Different...
Predicting the deformation based on landslide multi-mode monitor data is a critical issue of reliable data mining and comprehensive knowledge discovering of landslide for early warning. Due to the complex changes of multi-mode monitoring data and interaction effect caused by geological and geomorphological, hydrological, and anthropogenic factors, most of the deformation prediction methods cannot...
With the development of electric vehicles, large scale of plug-in electric vehicles integration will pose inevitable impacts on the planning and operation of power system in the future. It is necessary to properly coordinate electric vehicle charging and discharging time. According to electric vehicle battery state and current power grid operation conditions to control the battery charge and discharge...
The needs of vulnerable populations have been addressed, traditionally, by an ecosystem of private and public agencies that rely on donations (goods, money and services) which they re-distribute based on their perception of what is needed and where. This approach lacks a comprehensive understanding of the demand side as well as the ability to coordinate between various suppliers of goods and services,...
In order to accurately analyze the effect of temperature difference on the stress distribution of the test docking basket under vacuum and low temperature environment, according to the measured temperature data of the docking basket, the force-thermal coupling model of the docking basket in vacuum and low temperature environment was established. The equivalent stress is 275MPa, which exceeds the yield...
With the popularity of smart devices in a variety of actions to drive more usage of wireless broadband networks. OTT refers to delivery of video, audio and other media over the Internet. The video-related applications and services are major challenges that impact the network performance in the future. It is important to achieve network and service traffic offloading to overcome high-speed, real-time,...
The RD (Range-Doppler) spectrum of signal received from high frequency OTHR (over-the-horizon radar) consists of two Bragg peaks. However, contaminated by ionosphere, both two Bragg peaks will be shifted. A method based on Kullback-Leibler (KL) divergence and centroid, named Mode-Kullback-Leibler-Centroid (MKLC), is proposed to get a better estimate of the center frequency of RD spectrum. In the real...
This paper summarizes and analyzes the present situation of overseas development of Chinese book publishing industry. Opportunities for overseas development of Chinese book publishing industry include: Economic globalization, the growth of Chinese cultural industry, support and push for government policy, the trend of Chinese culture to the world. Through the construction of the book publishing industry...
Using spheroidal wave functions, scattering by layered spheroid can be solved by using separation of variables method (SVM) or extended boundary conditions method (EBCM). These two methods are analytically identical, while numerical implementation can result in differences in terms of convergence property as well as numerical stability. This work performs a comprehensive comparative assessment of...
Deployable radiator is a radiation cooling device which is folded next to side wall of spacecraft while launching, and can expand itself after the spacecraft is on track. It can effectively improve the cooling capacity of the spacecraft. In this paper, the current research and development situations of the deployable radiator were studied and analyzed. Depending on this, design and simulation of the...
A compact laser pumped vapor-cell cesium clock is introduced. The microwave cavity design is essential to the performance of the clock. In order to get a great homogeneity of the magnetic field, we use a compact magnetron cavity, which meanwhile reduces the size of physics package. Theoretical analysis shows the basic structure of the magnetron cavity, which is proved and further optimized by software...
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.