Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
We demonstrated and studied a new type of multi-resonant optical nanocavities with ultra-small mode volume. By geometric engineering of metal-dielectric multilayers, the total number of resonances and their spectral peaks can be tuned continuously.
Axial constant magnetic field produces 69-fold increase of ablation-crater depth on silicon surface ablated by ultraviolet nanosecond laser pulses. Analysis of potential mechanisms suggests strong combined effects from magneto-absorption and propagation through magnetized ablation plasma.
A method for detecting human motion in complex scenarios based on Channel State Information (CSI) is presented. First, the sensitivity of CSI phase information to human motion is explored, especially to the strenuous motion. Through a large number of experiments, the influence of human motion on CSI phase is found out, and the characteristics of signal changes are extracted. The One-class Support...
Dc arc faults may result in serious damage to both stationary and mobile dc power systems. This paper presents a new detection method for dc arcs using Hurst exponents. Compared to other methods such as the Fast Fourier Transform (FFT) and the Wavelet Transform, the proposed method is adaptive and is more immune to power electronics switching harmonics. A test setup to generate dc arcs is built and...
WiFi-based Human activity recognition has attracted attention in the human-computer interaction, smart homes, and security monitoring fields. We first construct a WiFi-based activity dataset, namely WiAR, to provide a benchmark for existing works. Then, we leverage the moving variance of CSI to detect the start and end of activity. Moreover, we present K-means-based subcarrier selection mechanism...
In this paper, an automatic parameter extraction and scalable modeling method for 1∼100GHz transmission line based on the equivalent-circuit model proposed in [1] is established. The parameters are extracted from electromagnetic simulations which are validated by the measurement date of the devices fabricated on HLMC 40nm RF CMOS process. This method is validated by application to scalable modeling...
In this paper, we evaluate the distributed deembedding methods in comparison with open-short deembedding technique for CMOS transistor on wafer characterization up to 40GHz. A set of NMOS transistor test structures fabricated on HLMC 40nm RF CMOS process are used for the investigation. Experimental results show the distributed methods are more physically reasonable than open-short deembedding technique...
It is crucial to transport foreign substance into living cells efficiently and minimize adverse side-effects. Using ultrasound microbubble, it is possible to enhance the cellular uptake and transfer the extracellular molecules into cells, this process is called sonoporation. However, the spatial location of microbubbles appears to be a stochastic process, which makes the targeted sonoporation at specific...
Transcranial ultrasound is an emerging technology for non-surgical stimulation of the animal and human brain. Previous studies has demonstrated that ultrasound could elicit discharge activity of retinal cells with short latency in animal (Journal of Neuroscience 33(10):4550–4560, 2013) and enhances sensory discrimination abilities of somato-sensory cortex in humans (Nature Neuroscience 17(2):322–9,...
Nanoparticle manipulation has a variety of potential applications, from two-dimensional material fabrication to biomedical engineering. Pattern and transportation of nanoparticles has been receiving increasing attention in recent years. Ultrasound as a mechanical wave has proven to be the most effective in the manipulation of micro-objects in a non-contact and non-invasive fashion. However, due to...
Recent studies have proven that ultrasound as a non-invasive method enable to delivery energy to deep brain for both excitation and reversible suppression of neuronal activity in cell, animal, human experiments (Scientific Reports 6:24170, 2016; Neuron 66(5):681-694; Nature Neuroscience 17(2):322-9, 2014). Due to bulk ultrasound transducer, it is difficult to compatible the ultrasound stimulation...
Enhancing the cell's membrane permeability enables to promote foreign substance into the cell and has various applications in biomedical engineering. Sonoporation employs the microbubble inertial cavitation to induce reversible cell-pores in the membranes allowing some impermeable molecules to be transferred into cells. However, the inertial cavitation is the violent collapse of bubbles and thus sonoporation...
It is one of the effective ways to reduce the amount of nitrogen fertilizer by using rice varieties with adaptation to low nitrogen environment or high efficient utilization of soil nitrogen. Red soil agro-ecosystem of South China is an important production base of double-cropped paddy rice. However, the rice yield and N use rate in this area have been at a low level especially for early rice, due...
Tin-plated copper structure was widely applied in the electronic products. With the development of the electronics industry, the integration degree increased and the component size reduced obviously. The conventional tin plating technology met the micro-structure challenge; it may not be used in advanced electronic packaging process. The electroless tin plating technology could solve this problem...
In order to meet the needs of China higher education of training students with strong foundation ability and innovation in the filed computer science, in recent years, the computer basic teaching team of Beijing Jiaotong University has carried out a series of scientific and effective educational reforms research and practice: 1. Carrying out “MOOC + SPOC + Flipped classroom” practice; 2. Construction...
School-enterprise cooperation has become an important guiding ideology for developing vocational education in China. This paper introduces a successful experience to build a lifelong learning system for employees. The developed lifelong learning platform has worked in the following way. Senior engineers of the enterprises train college teachers. Using rich teaching experience, the teachers can transform...
IoT and Internet technologies brought more opportunities for museums to interact with their visitors or potential visitors. Smart phone and Mobile APP is widely accepted and took ways to protect local culture. In this research, a museum APP investigation and a questionnaire survey are performed. We summarized the functions of existed museum APP and the demands of young people, and then give a museum...
In this paper, a new type of magnetic wheeled wall-climbing robot is proposed in order to overcome the shortcomings of existing climbing robots. It takes advantage of SOLIDWORKS to establish a three-dimensional model. Also, the paper introduces the design idea of wall-climbing robot, uses MATLAB to do the numerical analysis and make magnetic simulation through ANSOFT MAXWELL.
Greenhouse is a complex distributed parameters system where multiple climatic variables have great impacts on crop growth. In order to analyze the relationships of different factors inside greenhouse, a CFD model is constructed to simulate the microclimatic distribution in the greenhouse located in Zhenjiang, Jiangsu Province. The reliability of the model is validated by experimental data. On this...
Cavitation nozzle is the core component of cavitation generator. It promotes cavitation by its internal special structure, producing bubble and improving the impact force of jet. The structural characteristics directly affect the quality of the cavitation jet. Therefore, the study of internal structure of nozzle is helpful to improve the performance of nozzle. Based on CFD software, taking the Helmholtz...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.