A Dynamic Geometry System (DGS) is an application that allows the exact on-screen drawing of (generally) planar geometric diagrams and its manipulation by mouse dragging certain elements making all other elements to automatically self adjust to the changes. This is also known as Interactive geometry. From the beginning, DGS have been the paradigm of new technologies applied to Math education. B...

Velocardiofacial syndrome (VCFS) and DiGeorge syndrome (DGS) are characterized by a wide spectrum of abnormalities, including conotruncal heart defects, velopharyngeal insufficiency, craniofacial anomalies and learning disabilities. In addition, numerous other clinical features have been described, including frequent psychiatric illness. Hemizygosity for a 1.5-3 Mb region of chromosome 22q11 ha...

The use of dynamic geometry software (DGS) in all kinds of mathematical games has become a widespread phenomenon. Rich features and availability of free DGS, such as GeoGebra, have caused a growing interest for developing teaching materials for subjects other than matematics. We present the teaching materials that we developed in GeoGebra for the subject of geography at elementary and middle sc...

In this paper, we propose various defected ground structures (DGS) for improving the return loss and impedance bandwidth of an ultra wideband antenna. A comparative parametric analysis has been made on the basis of return loss, gain, radiation pattern characteristics and impedance bandwidth. Simulation results are analyzed and presented for an ultra wideband antenna with four slots in its radia...

New coplanar waveguide (CPW) filters with a forkshaped defected ground structure (DGS) are proposed for radio-frequency (RF) and microwave applications. The miniature CPW DGS filters developed are based on the silicon technology. The filters are able to provide the bandstop characteristics with high attenuation in the stop band and low insertion loss in the pass band. A typical filter designed ...

The defected ground structure (DGS) is one such technique which were intentionally modified to enhance the performance of the ground plane metal of a microstrip circuit. Importantly, in microwave application, the DGS plays an important role in analyzing the effect of surface and leaky waves. Tthe time of Practical verification, the surface and leaky waves are affected by the propagation errors ...

In this paper, a grid connected microgrid with multiple inverter-based distributed generators (DGs) is considered. DG in FFC mode regulates the microgrid as a controllable load from the utility point of view as long as its output is within the capacity limit. The transition mode causes a change in frequency of microgrid due to the loss of power transferred between main grid and microgrid. Frequ...

The Intergeo project started in October 2007 and will be funded until September 2010. Its main concern is the propagation of Interactive or Dynamic Geometry Software throughout Europe. Interactive Geometry is a way to improve mathematics education by using computers and Dynamic Geometry Software (DGS) and there are many advantages in comparison to “classical” geometry without DGS [Kortenkamp et...

Microdeletions/-duplications in the 22q11 region cause a variety of disorders, including DiGeorge syndrome (DGS; MIM 188400), velocardiofacial syndrome (VCFS; MIM 192430) and cat eye syndrome (CES; MIM 115470). DGS and VCFS have a large clinical overlap and are both caused by deletions of a specific 1-3 Mb region on chromosome 22q11. The overall birth prevalence of 22q11 deletions appears to be...