1,029 research outputs found
Torsion Design Example: Inverted Tee Bent Cap
No full textThis paper provides a practical example of the torsion design of an inverted tee bent cap of a three-span bridge. A full torsional design following the guidelines of the ACI 318-19 building code is carried out and the results are compared with the outcomes from CSA-A23.3-04, AASHTO-LRFD-17, and EN 1992-1-1:2004 codes. Then, a summary of the detailing of the cross-section considering the reinforcement requirements is presented. The objective of this paper is to illustrate the application of ACI 318-19 when designing a structural element subjected to large torsional moments.Accepted Author ManuscriptConcrete Structure
Analysis of Reentrant Hybrid Tee
No full textThe conventional hybrid tee, which is symmetrical and reciprocal, has been used exclusively in mixer and impedance bridges in microwave engineering. The interconnection of the E-arm and H-arm of the hybrid tee through a 90-degree twist and a phase-shifter by Ishii and Jenners has turned the magic tee into a reentrant hybrid tee with different properties. Ishii and Jenners\u27 paper on the different attenuation levels of port 1 and port 2 of the reentrant hybrid tee has aroused the public interest about the characteristics of the reentrant hybrid tee. It is intended in this study to investigate the characteristics of the reentrant hybrid tee experimentally and theoretically. In the experiment, the author has done the measurements about attenuation, VSWR and impedance against the variation of frequency or phase-shifter setting of the reentrant loop. In theory, the author has derived a general equation for the reentrant hybrid tee, in terms of the scattering parameters of a basic hybrid tee. Conclusions were made about the reentrant hybrid tee by combining the experimental results and theoretical equations
TEE - The Electronic Exercise
No full textThe Electronic Exercise (TEE) is an experimental adaptive learning system which uses knowledge structures to apply an intelligent tutoring algorithm and especially the representation of its surmise relation via HASSE diagrams to navigate within the learning material, to visualize the learning progress and convey the structure itself to the learner. TEE is implemented via dynamic HTML and comes with an editor tool for the structure and the test exercises. Thus an author or teacher can build its own TEE system easily
Reflection Co-Efficients of Re-Entrant Hybrid Tee
No full textThe conventional hybrid tee is a result of the combination of the E- plane tee and the H- plane tee into one device. The E-H hybrid tee has wide application as impedance bridge, Duplexer, mixer, discriminator, and in cascading of one port amplifier. The field of study in the hybrid tee was widened by introduction of the E-H reentrant tee which interconnects the E and H ports. Such a loop has been studied with reflectionless load. The author has extended the field of study of the E- H reentrant tee to the case of shorting load. A whole new reentrant tee has also been experimented on by interconnecting the collinear ports instead of the E-H ports. This study will help further work on the collinear hybrid tee
Civil societies' input for reform of social protection in Ghana
No full textAuthor: Clara K. Beeri Kasser-Tee (Esq), University of Ghana School of Law; Assisted by: Rushaiya Ibrahim-Tanko, Kasser Law Fir
Objective Image Quality Assessment and Comparison of Ultrasound Probes: Research to Application of Trans-Balloon, Miniaturized TEE in Atrial Ablation Procedures
No full textAtrial Fibrillation (AF) is a common type of arrhythmia, characterized by rapid and irregular contraction of the atria. Irregular contraction of the atria is caused by erroneous electrical activation, originating from the tissue around the Pulmonary Veins (PV) in the Left Atrium (LA). Catheter-based treatment of AF includes ablation of the tissue around the PV. Imaging of ablation catheters and LA-anatomy is of great importance for accurate and successful treatment of AF. In current state of the art LA-ablation procedures, static, pre-procedural acquired 3D models of the LA are used for catheter navigation and monitoring. However, due to the limited accuracy of these static 3D models there is a continuous demand for real-time 3D imaging techniques during catheter based treatment of AF.A possible solution for real time imaging is to use trans-balloon, miniaturized transesophageal echocardiography (TEE) as imaging modality for AF ablation procedures. Trans-balloon, miniaturized TEE can provide real-time 3D ultrasound imaging of the LA. Since trans-balloon, miniaturized TEE is not used in clinical practice yet, it is unknown whether image quality of the miniaturized TEE probe will be sufficient for imaging during AF ablation procedures. Therefore, the image quality of trans-balloon, miniaturized TEE has to be compared to image quality current state of the art TEE probes.In this thesis, image quality of the miniaturized ultrasound probe was compared to current state of the art TEE probes, and the influence of the balloon on image quality was investigated. Image quality was assessed using standardized ultrasound image quality assessment phantoms and software. Image quality was measured using the following image quality parameters: contrast to noise ratio (CNR), spatial resolution and penetration depth of the ultrasound signal.The results have shown that CNR of the miniaturized probe is equal to that of state of the art probes, but that spatial resolution of the miniaturized probe strongly depends on the rotation angle of the ultrasound imaging plane. Rotating the imaging plane of the miniaturized TEE probe negatively impacts spatial resolution, which was not observed for the state of the art TEE probes. The penetration depth of the ultrasound signal was significantly less compared to state of the art TEE probes.The rotation-dependent spatial resolution of the miniaturized probe is undesired, since rotating the imaging plane is common practice in TEE. A review study involving clinical experts is recommended to judge whether image quality of the miniaturized probe with rotated imaging plane is sufficient.Since the anatomical structures of interest during AF are close to the transducer, the limited penetration depth of the miniaturized probe will not be a major limitation. Despite aforementioned limitations, the results suggest that trans-balloon miniaturized TEE can be used for real-time ultrasound imaging during AF ablation procedures.The research in this thesis provides a theoretical framework to measure and compare image quality of ultrasound probes, which is an important first step in the development of a novel, real-time 3D imaging technique for imaging of AF ablation procedures.Biomedical Engineerin
IBPP Research Associates: Namibia
No full textThe article discussed – Letter From Tripoli, by Tee Ngugi, a lecturer and a political and cultural commentator based in Windhoek - was posted on the November 5, 2003 issue of the online version of The Namibian. It may not be provided in Scholarly Commons due to copyright restrictions.
In the fictional letter “written by” Colonel Gadaffi to Thabo, the author discusses equally fictional weapons – the mosquito-armed warhead a Mosqlear bomb and its tsetse fly equivalent a Tsetsetomic bomb – and the supposed impact of sending them to modern colonizing powers
Effect of combining angle and branch diameter for flow-induced vibration at tee connection
Full text linkIn the process plant, random vibration with shell mode excited by the turbulence generated at tee connection might cause problems such as piping damage. Author proposed a new evaluation index in the previous work to evaluate the random vibration with shell mode at tee connection downstream and the adequacy of the index was confirmed by the experiment with 1.5 inch × 4 inch piping system with 45 deg combining tee connection so as to confirm the adequacy of the index proposed in the previous work. This paper presents the experimental study results to investigate the effects of branch size and combining angle. In the experiment the branch area ratio to the main pipe area were varied from 0.0146 to 1.00, and two combining angles, 90 and 45 degrees were examined. As a result, it was confirmed the proposed index could evaluate vibration stress adequately for wide range of the branch pipe area ratio. And the vibration stress for the piping system with 90 deg connection is around 1.4 times of that with 45 deg tee connection
Palmprint Recognition For Personal Identification System
No full textPalmprint is well-known for several advantages such as stable line features, low-resolution imaging, low-cost capturing device, and user-friendly. In this thesis, an automated scanner-based palmprint recognition system is proposed. The system automatically captures and aligns the palmprint images for processing. The proposed palmprint recognition system consists of two important stages namely the enrollemnt and recognition components. In the enrollment stage, the palmprint images acquired are first aligned by the pre-processing step. After that, important palmprint features are extracted to generate matching templates to be stored in the database. In the verification stage, a new palam print image is also processed bt the pre-processing and feature extraction module, and then matched with the stored reference template to determine whether it belongs to a genuine template
Energy expenditure and physical activity in clozapine use: implications for weight management
No full textObjective: The management of atypical antipsychotic-induced weight gain is a significant challenge for people with mental illness. Fundamental research into energy metabolism in people taking atypical antipsychotic medication has been neglected. The current study of men with schizophrenia taking clozapine aimed to measure total energy expenditure (TEE) and energy expended on physical activity – activity energy expenditure (AEE) and to consider the clinical implications of the findings. Method: The well-established reference method of doubly labelled water (DLW) was used to measure TEE and AEE in men with schizophrenia who had been taking clozapine for more than 6 months. Resting energy expenditure was determined using indirect calorimetry. Results: The TEE was 2511 ± 606 kcal day<sup>−1</sup> which was significantly different to World Health Organization recommendations (more than 20% lower). The Physical activity level (PAL) was 1.39 ± 0.27 confirming the sedentary nature of people with schizophrenia who take clozapine. Conclusions: The findings support the need for weight management strategies for people with schizophrenia who take clozapine to focus on the enhancement of energy expenditure by increasing physical activity and reducing inactivity or sedentary behaviours, rather than relying primarily on strategies to reduce energy intake
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