Electron Wave Filters from Inverse Scattering Theory

Semiconductor heterostructures with prescribed energy dependence of the transmittance can be designed by combining: {\em a)} Pad\'e approximant reconstruction of the S-matrix; {\em b)} inverse scattering theory for Schro\"dinger's equation; {\em c)} a unitary transformation which takes into account the variable mass effects. The resultant continuous concentration profile can be digitized into an easily realizable rectangular-wells structure. For illustration, we give the specifications of a 2 narrow band-pass 12 layer $Al_cGa_{1-c}As$ filter with the high energy peak more than {\em twice narrower} than the other.Comment: 4 pages, Revtex with one eps figur

RESEARCHES ON SOIL CONTAMINATION WITH HEAVY METALS AND THEIR REMANENCE IN VEGETABLES

 The paper presents the results of experimental researches on soil contamination with heavy metals (copper, lead, zinc) in different concentration each (c1=1.5 %; c2=3.0 %; c3=4.5 %; c4=6.0 %). The contaminated soil was placed in pots, where spinach and radish seeds were planted. The vegetables were grown in a greenhouse until the end of the vegetation period, afterwards being harvested and the remanence of each heavy metal for each concentration was determined for each plant. The results obtained were compared with the blank sample where the soil was not contaminated.        The purpose of the study was to identify the levels of heavy metals (Cu, Zn and Pb) transfer/absorption from the soil into spinach leaves respectively radish roots

Renaturing cities: from utopias to contested realities and futures

Renaturing urban environments is a transformative pathway for urban sustainability that can be leveraged for collaborative research and planning to reverse long trends of ecosystem degradation. People-nature connections need to be reinforced to enable the successful uptake and upscale of urban renaturing practices. Improving people's understanding, perception, and emotions towards nature is therefore key. In this paper, we discuss how human knowledge and values of nature can be enabled through urban renaturing. Besides, we discuss the required transitions in urban planning processes to support urban renaturing practices

Maxilary Suppurative Inflammation on Chronic Treatment with Bisphosphonates for Bone Metastasis – A Case Report

Abstract Introduction. Bisphosphonates represent a class of anti-resorbable bone care drugs that inhibit the function of active osteoclasts and reduce bone resorption. They are used in the Oncology and Hematology specialties as adjuvants in the treatment of osteolytic bone metastases and associate osteonecrosis of the maxillo-facial bones, most commonly of the mandible, as an adverse reaction. Material and method: case report. We present the case of a 65-years-old female patient, with breast cancer and bone metastasis, under chronic treatment with bisphosphonates. She presented a chronically odontogenic suppurative maxillary rhinosinusitis induced by maxillary post-extraction osteonecrosis on the background of bisphosphonate treatment and fistula in the upper right vestibule. Surgery under general anesthesia and sequestrectomy were performed. Discussion. The patient also associated coagulation disorders with mixed mechanism, adding an element of major surgical difficulty requiring a massive intraoperative transfusion with fresh refrigerated plasma to control hemostasis. Conclusions: The side effects of bisphosphonates used in the treatment of bone metastasis on the maxillofacial bones are significant. For this reason, the dental extraction in patients treated with bisphosphonates should be done with great caution and maxillary suppurative inflammation in post-extraction context in these patients should raise the suspicion of underlying bone necrosis.</jats:p