An all‐dielectric metasurface exhibiting a strong toroidal resonance is theoretically designed and experimentally demonstrated as an angular‐dependent resonant polarization beam‐splitter in the microwave K‐band. The metasurface is fabricated by embedding a square periodic array of high‐permittivity ceramic cuboid resonators in a 3D‐printed substrate of polylactic acid. It is demonstrated that by properly selecting the resonator geometry and by tuning the angle of incidence through mechanical rotation, the metasurface can switch between a polarization beam splitting and bandpass or bandstop operation. Such performance is achieved by exploiting the highly asymmetric Fano spectral profile of the toroidal resonance and the very low (high) dispersion of the associated p‐(s‐) polarized mode resulting from the resonant toroidal dipole mode's field profile, as evidenced by both full‐wave and band structure simulations. Theoretically infinite extinction ratios are achievable for polarization beam splitting operation with very low insertion losses and adjustable bandwidth. The experimental demonstration of such a compact, all‐dielectric metasurface expands the research portfolio of resonant metasurfaces toward not only the investigation of the intriguing physics of toroidal modes but also to the engineering of functional millimeter‐wave components for polarization control, for instance, in the context of 5G wireless communication networks.

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Abstract. Without additional prior information, the pose of a camera estimated with computer vision techniques is expressed in a local coordinate frame attached to the camera’s initial location. Albeit sufficient in many cases, such an arbitrary representation is not convenient for employment in certain applications and has to be transformed to a coordinate system external to the camera before further use. Assuming a camera that is firmly mounted on a moving platform, this paper describes a method for continuously tracking the pose of that camera in a projected coordinate system. By combining exterior orientation from a known target with incremental pose changes inferred from accurate multi-GNSS positioning, the full 6 DoF pose of the camera is updated with low processing overhead and without requiring the continuous visual tracking of ground control points. Experimental results of applying the proposed method to a moving vehicle and a mobile port crane are reported, demonstrating its efficacy and potential.

management, surgery has played a lesser role in the management of bleeding esophageal varices in recent decades. The present report describes a patient with portal hypertension with massive splenomegaly and liver cirrhosis initially presented with hematemesis and hematochezia who was diagnosed with esophagogastric varices. The modified Sugiura procedure is an effective rescue therapy for patients who are not candidates for selective shunts, transhepatic porto-systemic shunt, or transplantation and in order not to change the anatomic structure of the great vessels and to avoid hepatic encephalopathy related to these shunting procedures. Case presentation: A 33 year old female was referred to our hospital initially for band ligation of bleeding esophageal varices with clinical presentations of severe pancytopenia, massive splenomegaly and massive esophageal varices. The upper abdominal ultrasound showed an liver parenchymal disease with cirrhotic changes and signs of portal hypertension (marked splenomegaly, dilated portal vein and splenic varices). A complete gastroesophageal devascularization with splenectomy (Laparoscopic assisted modified Sugiura procedure) was performed. The patient has been asymptomatic for 9 months postoperatively, and hematological indices reached their normal values. Conclusion: For patients who are not candidates for liver transplantation and who cannot be shunted because of portal vein thrombosis, the modified devascularization Sugiura procedure remains a reasonable surgical option that can be performed in nonspecialized centers. Introduction: Three-dimensional (3D) printing is a rapidly advancing technology considered thus as a significant technological attainment that could be set up for a variety of applications in the medical field. In surgery, three-dimensional printing can contribute to education, surgical planning, and training while 3D printed models represent as high-quality educational tools. Methods: (DICOM) files from a number of CT and MRI patient examination, reconstructed using computer-aided design (CAD) drawings software. Digital 3-D objects send to a 3-D printer, and 3-D models are created using a polymeric ABS (acrylonitrile butadiene styrene ABS) filament. With a same way, a numbered of surgical tools was produced. Results: The 3-D printed pre-operative model demonstrated the exact anatomy of the real. A lot of printed models (liver, vascular, bone etc) and surgical tools were produced and were used for educational purposes. Conclusion: We demonstrate a successful use of 3d printing models for preoperative planning and education purposes. 3-D printing rapid prototyping is a standard technique that is used by surgeons nowadays to plan complex operations. Compared with pure imaging studies and intraoperative findings, we believe that with 3d printing technology we can have better preoperative planning and optimize our treatment strategy during surgery especially in the field of HPB surgery.

Abstract. The use of Augmented Reality (AR) technology is widespread in countless archaeological sites and a variety of applications. Archaeological excavations lead to archaeological finds, some of which are transported for preservation and then for exhibition in museums (jewelry, vases, etc.), while another part of them is documented in detail and remains in situ (eg building walls), roads, grave covers, etc.). However, after the registration of the archaeological finds, it is impossible to observe them. As part of our research project, we will develop for the first time AR methodology and procedures for the observation of covered archaeological finds on mobile devices (smart phones, tablets), which were registered after their documentation. AR technology in recent years has seen great growth in terms of implementation platforms and available software, as well as the tools developed to support it. These tools either make their appearance in the form of frameworks, extending the capabilities of an existing engine, or function as independent services. At the same time, progress has been made in the field of sensors of mobile devices, which makes the compatibility of hardware and software another issue to be researched. As part of the development of the above application for mobile devices, an evaluation is made of the most widespread AR Frameworks that support the Unity3d Game Engine and the compatibility / interoperability with the sensors of different categories of mobile devices. The frameworks were checked and evaluated for placement and tracking of the positions of the 3D covered objects. In this paper also, methodologies and techniques used in space detection and tracking are presented and evaluated.