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Hadal science has become one of the research frontiers in earth sciences in recent years. Free-fall vehicle, also known as “lander” has provided new opportunities to investigate the hadal zone. Two hadal expeditions in the Mariana Trench were conducted successively with the support of Chinese Academy of Sciences since last June to this March. Two 7000-meter rating landers named Tian Ya and Hai Jiao...
This paper suggests a new method for image registration, based on a new similarity measure, the standard deviation normalized summed squared difference. Such a similarity measure is explicitly defined on the effective overlap between two images, and the image registration is fulfilled by searching for a global minimum peak of this measure over the entire parameter space. Conceptually the suggested...
Due to its potential applications in optoelectric area, WS2/graphene heterojunction attracts much attention in past years. But until now, modulation of their working performance is still a big challenge for the researchers. In this work, WS2/graphene heterojunctions have been sucessfully fabricated on Si substrate. Moreover, their surface configuration were researched by STM and AFM techniques. Finally,...
In manned/unmanned-aerial-vehicles team, the workload of manned-aerial-vehicle (MAV) pilot is an important indicator to measure pilot's cognitive state. Evaluating the pilot workload is significant to analyze human-robotics system cognition and intelligent interaction questions. This paper proposed a mathematical model that can measure pilot workload. The model evaluates the workload through three...
A regime change is considered to be a significant change in the trading behaviour of the financial market. Such changes are always related to the booms and crashes that occur in the financial market. Being able to detect regime change could lead both to a better understanding of and a further way to monitor the financial market. In this paper, we explain how to detect regime change using directional...
Pathological processes in soft tissues cause changes in mechanical properties. Elastography methods have emerged to make quantitative measurements of the shear modulus or shear wave velocity (SWV) as a noninvasive way to provide diagnostic information. In an effort to standardize ultrasound-based measurements of SWV, the Radiological Society of North America Quantitative Imaging Biomarkers Alliance...
Pathological processes in soft tissues cause changes in mechanical properties. Elastography methods have emerged to make quantitative measurements of the shear modulus or shear wave speed (SWS) as a noninvasive way to provide diagnostic information. In an effort to standardize ultrasound-based measurements of SWS, the Radiological Society of North America Quantitative Imaging Biomarkers Alliance (RSNA...
High pressure air blowing liquid solder and synchrotron radiation x-ray real-time imaging technology were used to study the interface reactions of Sn-XAg/Cu (X=0, 1, 3) joints during reflow with various soldering time under temperature of 250/275/300°C. This experiment allows us in-situ observe the interfacial IMCs growth and completely avoids Cu6Sn5 precipitation from the solder in cooling stage...
Synchrotron radiation x-ray real-time imaging technology was used to study the interface reactions of Sn/Cu and Sn0.7Cu/Cu joints during reflow with soldering time of 1h under temperature of 300/350 °C. This experiment allows us in-situ observe the interfacial IMCs growth and completely avoids Cu6Sn5 precipitation from the solder in cooling stage to affect the morphology and thickness of interfacial...
A free viewpoint application has been developed that yields an immersive user experience. The free viewpoint approach called the "billboard methodis" suitable for displaying a synthesized 3D view in a mobile device, but it suffers from the limitation that a billboard cannot present an accurate impression of depth for a foreground object, and it gives users an unacceptable impression from...
In this paper, we design an all-dielectric metasurface, which can produce a sharp transmission peak due to analogue of electromagnetically induced transparency to realize refractive index sensing. The structure is a periodic lattice of a silicon dumbbell-shaped bar and a silicon ring resonator on the bulk fused silica substrate. The EIT phenomenon of the proposed metasurface and the refractive index...
A transparent cold cathode panel was fabricated and applied in a double-side emitting light source using ZnO nanowire field emitter arrays(FEAs). ITO thin film coating on starting Zn film was adopted to modify the morphology and field-emission properties of ZnO nanowires. The transparent ZnO nanowire cold cathode panel shows more than 84.7% transmission in the visible light region. A fully sealed...
Using the ZnO nanowire emitters with the photoconductor as the anode, the concept of a light-responsive field emission display (FED) was demonstrated. The brightness of display can be automatically increased with the increasing of external light-intensity. Additionally, the photo/dark current ratio can be controllably adjusted by changing the device parameters. The response of conductivity of photoconductor...
ZnO nanowire field emitter arrays with non-coplanar focus electrode structure was designed. A simulation was conducted to verified the focusing ability of the focus electrode structure. The designed structure was realized successfully and the growth condition of ZnO nanowires in the structure was studied.
Field Emission Pattern Image of Carbon Nanotubes has been captured by using electron beam scanning analyzer. The measurement showed that the Faraday cup scanning method can provide a high resolution field emission sites distribution measurement (the best resolution is up to 0.01mm), which is higher than that using the transparent anode method.
A transmission anode flat panel X-ray source with the ZnO nanowire field emitter arrays(FEAs) has been realized. The thickness of the transmission-type flat panel X-ray target has been optimized to maximize the output intensity of X-rays. The EGSnrc-based Monte Carlo codes are utilized to simulate the X-ray intensity and spectrum generated from the target. The simulation results show that the target...
In this work, the numerical dispersion of the three-dimensional (3-D) finite-difference time-domain (FDTD) method with weighted Laguerre polynomials (WLP) is presented. The phase velocity of numerical wave modes is relevant to the direction of wave propagation, grid discretization and time-scale factor. Additionally, the unconditionally stability for marching-on-in-order WLP-FDTD scheme, with the...
α-Fe2O3 nanomaterials with different morphology parameters were prepared by varying growth temperature in the thermal oxidation process. After current aging treatment, emission current density increased from 0.05 mA/cm2 to 5.70 mA/cm2 under applied electrical field of 7.8 MV/m.α-Fe2O3 nanoflakes prepared under 350 °C exhibits low threshold field of 5.1 MV/m. Current aging treatment was carried out...
Vacuum micro/nano electronic devices possess merits of radiation hardness, temperature tolerance, high working frequency and output power. It's regarded as the promising candidates for the application on ultra-high speed transistor [1, 2], portable and fast-switch X-ray source [3], free electron laser [4], field emission display [5] and so on. In the developing of modern vacuum electronic, to achieve...
Field electron emission patterns emitted from few-layer graphene with different edge morphology were investigated using field emission microscopy (FEM). The FEM image of few-layer graphene was observed as a “lantern”, which is composed of light and dark fringes. The relationship between graphene edge morphology and field emission pattern was investigated using a emission electron spatial interference...
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