An Efficient Framework For Fast Computer Aided Design of Microwave Circuits Based on the Higher-Order 3D Finite-Element Method

In this paper, an efficient computational framework for the full-wave design by optimization of complex microwave passive devices, such as antennas, filters, and multiplexers, is described. The framework consists of a computational engine, a 3D object modeler, and a graphical user interface. The computational engine, which is based on a finite element method with curvilinear higher-order tetrahedral elements, is coupled with built-in or external gradient-based optimization procedures. For speed, a model order reduction technique is used and the gradient computation is achieved by perturbation with geometry deformation, processed on the level of the individual mesh nodes. To maximize performance, the framework is targeted to multicore CPU architectures and its extended version can also use multiple GPUs. To illustrate the accuracy and high efficiency of the framework, we provide examples of simulations of a dielectric resonator antenna and full-wave design by optimization of two diplexers involving tens of unknowns, and show that the design can be completed within the duration of a few simulations using industry-standard FEM solvers. The accuracy of the design is confirmed by measurements

Study of dynamic forces in human upper limb in forward fall.

Knowledge of dynamic forces acting on the upper limb is useful, and sometimes even necessary, in its treatment and rehabilitation after injuries, during prostheses designing, as well as in optimization of the sports training process. In this work an attempt to determine the quantity of the inertia forces generated in forward fall has been undertaken. For this purpose a simplified mechanical model of the human body biokinematic chain has been prepared. Geometric data and mass of each element have been taken from anthropometric atlas for the Polish population. Kinematic data necessary to perform the analysis was calculated using fundamental laws of Mechanics. In this way accelerations of the selected points necessary for the determination of inertia forces acting on the individual links of the model were yielded. For validation of the obtained results a numerical model was constructed using SimMechanic module of the Matlab Simulink software. It made possible to compare the results obtained in both simulation methods. To make joints model more realistic a values of the viscous friction were assumed

A Search for N2+ in Spectra of Comet C/2002C1 (Ikeya-Zhang)

We report low- and high-resolution spectra of comet C/2002 C1 (Ikeya-Zhang) from McDonald Observatory. The comet had a well-developed ion tail including CO+, CO2+, CH+, and H2O+. We used our high-resolution spectra to search for N2+. None was detected and we placed upper limits on N2+/CO+ of 5.4 times 10^{-4}. N2+ was detected in the low-resolution spectra but we show that this emission was probably telluric in origin (if cometary, we derive N2+/CO+ = 5.5 times 10^{-3}, still very low). We discuss the implications for the conditions in the early solar nebula of the non-detection of N2+. These depend on whether the H2O ice was deposited in the amorphous or crystalline form. If H2O was deposited in its crystalline form, the detection of CO+ but not N2+ has implications for H2O/H2 in the early solar nebula.Comment: Accepted for publication in ApJ (Letters) - 10 Sept 200

Conversations Between Communities: UMass Boston Archaeology for and with the Nipmuc Nation & the Eastern Pequot Tribal Nation

Community-engaged scholarship, learning, and service are becoming important parts of university missions, ensuring that academic projects do not just “take” but also give back in meaningful ways. For Native American communities and archaeologists who come from and work with them, this kind of research sensitivity and community accountability is fundamentally important. Archaeological projects with, by, and for Native American communities vary as much in their structures and goals as the communities themselves. In order to meet the desires and needs of each community, two archaeological field schools at UMass Boston – Hassanamesit Woods (Grafton, Massachusetts) and Eastern Pequot (North Stonington, Connecticut) – have employed different levels of consultation and collaboration to engage the Nipmuc and the Eastern Pequot communities in the archaeology conducted on their lands. Similarities and differences between artifacts unearthed speak to each community’s unique experiences over the last 400 years, providing new insights to spark conversations between these indigenous groups and the archaeologists and students who work with them. The artifacts discovered fall into four main categories – connections to a deeper past, foodways, architecture, and daily lives – that broadly encapsulate life at a Nipmuc homesite and at several 18th- and 19th-century households on the Eastern Pequot reservation

The determinants of biotechnology development by academic entrepreneurship and spin-off companies in the commercialization process of scientific research results in Poland

Innovative sectors of high technology are considered as one of the most important elements of the modern economy. The biotechnology industry perfectly fulfills the criteria of belonging to sectors of this type, and by some researchers [1] its development is considered indispensable for the functioning of modern economy. In technologically advanced industries, progress is impossible without access to knowledge and innovation, the most important source of which are research and development (R&D) institutions – both parts of companies and state research and educational entities (higher education institutions)

Phase I Archaeological Intensive Survey of Hassanamesitt Woods Property, Grafton, Massachusetts

The Center for Cultural and Environmental History conducted a Phase I archaeological intensive survey of the Hassanamesitt Woods property in Grafton, Massachusetts from October 2004 through January 2005. Documentary evidence has suggested that the property may contain remains of the church for the Praying Indian village of Hassanamisco, established by John Eliot in 1660. Historical deed research has also placed several Nipmuc families on the property in the early 18th century, suggesting the area was resettled by the original inhabitants of Hassanimisco in the aftermath of King Philip\u27s War. Throughout the course of the 18th and 19th centuries the property was subsequently parceled out for agricultural purposes to white landowners. Nipmuc presence on the property however endured until the end of the 19th century. During the 20th century the property was utilized predominantly for orchards before reverting to its current state of woodland. The survey of the 203+ acre property on the southern slope of Keith Hill consisted of shovel testing and a GPS survey of above ground features in order to identify historic and prehistoric resources and make recommendations for the future management of the property. A total of 386 test pits were excavated on 10m and 20m intervals covering approximately 74 acres and identifying six historic sites and one prehistoric site. The prehistoric site is composed of a well-defined lithic quarry, while the historic sites consist of the remains of 18th, 19th, and 20th century residential, agricultural, and low level industrial activities. The highest concentration of residential material has been identified as the remains of 18th and 19th century Nipmuc settlement. No 17th century component related to John Eliot\u27s church or meeting house was recovered. Several aboveground features were located, including cellar holes, wens, extensive stone walls, stone retaining walls, and cobbled terraces. Because the property is not slated for large-scale development it is recommended that no further immediate archaeological testing is needed. However, the archaeological remains related to 18th and 19th century Nipmuc settlement offer an opportunity to investigate Native American resettlement after the abandonment of Hassanamisco. Future archaeology may also help with public interpretation of the property within the context of long term land use from the Prehistoric Archaic period through the Early Modem period. Data gathered during this Phase I survey provides a starting point for the public interpretation of the Hassanamesitt Woods property and allows for the proper management of the property in terms of trail placement and low impact construction

Różne oblicza układów dynamicznych

Mrozowski, Jerzy : Katedra Automatyki, Biomechaniki i Mechatroniki - Wydział Mechaniczny - Politechnika ŁódzkaArtykuł zamieszczony jest w : Życie Uczelni : biuletyn informacyjny Politechniki Łódzkiej nr 151, marzec 2020Międzynarodowa konferencja Dynamical Systems – Theory and Applicationsodbyła się po raz 15. Zgromadziła ponad 200 uczestników, wśród których goście zagraniczni z 40 krajów stanowili 65 proc

Paradoksy sarmatyzmu. Obyczaj – polityka – ikonografia

Źródeł sarmatyzmu upatrywano w legendach historiograficznych wywodzących szlachtę polską od starożytnych Sarmatów. Samo zjawisko miało być wynikiem oddziaływania kultury Orientu. Nie tłumaczy to jednak jego istoty. Sarmatyzm nie wyrastał z fascynacji kulturą Wschodu, ale z kontestacji Zachodu. Było to w końcu XVI stulecia wyrazem przekonania szlachty o doskonałości polskiego ustroju gwarantującego jej wolność i przywileje. Poczucie odrębności wyraziło się wówczas orientalizacją ubiorów szlacheckich, które stały się znakiem tożsamości narodowej, co uwidaczniają źródła ikonograficzne