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- 摘要
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- 实验方案
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First Experimental Demonstration and Mechanism of Abnormal Palladium Diffusion Induced by Excess Interstitial Ge
摘要： This letter represents the ?rst direct experimental demonstrations and mechanism proposal regarding abnormal palladium diffusion into germanium (Ge). Our experiments indicated that excess Ge atoms among palladium germanide alloy formation indirectly induce the abnormal out-diffusion of mass palladium atoms into Ge. Consequently, palladium germanide alloy on both n-type and p-type Ge form ohmic-like Schottky junctions. To identify this phenomenon, ?rst-principle calculations and technology computer-aided design simulation were used to evaluate the electrical in?uence of palladium atoms in Ge. We discovered that the activated palladium atoms in Ge induce large midgap bulk-trap states, which contribute to a severe increment of trap-assisted tunneling current at the palladium germanide/Ge junction.
关键词： Schottky junction,First-principles calculations,palladium germanide,technology computer-aided design,germanium,trap-assisted tunneling,fermi-level pinning effect
更新于2025-09-10 09:29:36
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Coupling Pulsed Flying Spot technique with robot automation for industrial thermal characterization of complex shape composite materials
摘要： In a previous work we developed methods based on Pulsed Flying Spot (PFS) to measure the in-plane thermal diffusivity of (an)isotropic materials. Due to the optical laser scanning system, the effective measurement area is around 5 cm x 5cm) to obtain a good spatial resolution and to ensure accurate estimated thermal fields. First, to extend the previous method to largest scanning area, we propose to use a robotic arm to analyse large composite samples of complex shape (more than 50 cm x 50 cm). The main advantage of using the robot is to design by Computer Aided Design the complete geometry of the composite sample in order to scan the complete area of the composite and also to orient the non-plane surface of the sample perpendicular to the IR camera field of view and laser spot. Finally, all the area can be thermally characterized and the retrieved in plane thermal diffusivities maps are pasted on the 3D shape to visualise heterogeneity and anisotropy.
关键词： thermal diffusivity,robotic arm,Pulsed flying spot,computer aided design
更新于2025-09-09 09:28:46
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Computer-Aided Panoramic Images Enriched by Shadow Construction on a Prism and Pyramid Polyhedral Surface
摘要： The aim of this study is to develop an efficient and practical method of a direct mapping of a panoramic projection on an unfolded prism and pyramid polyhedral projection surface with the aid of a computer. Due to the fact that straight lines very often appear in any architectural form we formulate algorithms which utilize data about lines and draw panoramas as plots of functions in Mathcad software. The ability to draw panoramic images of lines enables drawing a wireframe image of an architectural object. The application of the multicenter projection, as well as the idea of shadow construction in the panoramic representation, aims at achieving a panoramic image close to human perception. The algorithms are universal as the application of changeable base elements of panoramic projection—horizon height, station point location, number of polyhedral walls—enables drawing panoramic images from various viewing positions. However, for more efficient and easier drawing, the algorithms should be implemented in some graphical package. The representation presented in the paper and the method of its direct mapping on a flat unfolded projection surface can find application in the presentation of architectural spaces in advertising and art when drawings are displayed on polyhedral surfaces and can be observed from multiple viewing positions.
关键词： polyhedra,panoramic projection,shadow construction,Computer Aided Design (CAD),maps on surfaces,descriptive geometry
更新于2025-09-09 09:28:46