180 research outputs found
Accuracy of Microwave Transistor fT and fMAX Extractions
No full textWe present a complete methodology to evaluate the accuracy of microwave transistor figures-of-merit fT (current gain cut-off frequency) and fMAX (maximum oscillation frequency). These figures-of-merit are usually extracted from calibrated S-parameter measurements affected by residual calibration and measurement uncertainties. Thus, the uncertainties associated to fT and fMAX can be evaluated only after an accurate computation of the S-parameters uncertainties, including the contribution from de-embedding. This was done with the aid of two recently released software tools. We also present an analysis on how different interpolation/extrapolation methodologies affect uncertainty. Finally, an overview of the possible causes of errors and suggestions on how to avoid them are given. With the continued rise of reported fT /fMAX values, this study has become necessary in order to add confidence intervals to these figures-of-meri
2D- compared 3D- human cell models: cytotoxic effects of humid lightweight coal ash derived from the disposal of waste
No full textThe presence of waste in environment represents a significant risk to huma health.. The potential toxic effects of humid lightweight coal ash (EWC100102) derived from waste disposal were investigated in vitro on human keratynocyte and andotelial cell lines, comparing different approac: direct/indirect contact, 2D/3D models.Cyotoxic potential resulted influenced by direct and indirect contact exposure; Endothelial cells resulted more susceptible to experimental exposure; 3D culture can provide a better microenvironment for mimic the real in vivo conditions, and are more sensiive and accurat tool for assessing in vitro potential of a chemical compound
2D- compared 3D- human cell models: cytotoxic effects of humid lightweight coal ash derived from the disposal of waste
No full text2D- compared 3D- human cell models: cytotoxic effects of humid lightweight coal ash derived from the disposal of wast
Аntimicrobial and anticancer activity of new poly(propyleneamine) metallodendrimers
No full textThe synthesis, EPR characterisation and biological
evaluation of two new metallodendrimers, i.e. a
poly(propyleneamine) dendrimer functionalized at the external
surface with 4-bromo-1,8-naphthalimide and conjugated
with Cu(II) and Zn(II), was performed with the aimto evaluate
their antimicrobial and anticancer activity. The antimicrobial
activity was investigated in meat-peptone broth against bacteria
B. subtilis and P. aeruginosa, and the yeast C. lipolytica.
The results showed that the compounds inhibited effectively
the tested pathogens even after their deposition on a textile
fabric. Anticancer activity was investigated against three human
permanent cell lines from non-small cell lung cancer
(A549), triple negative breast cancer (MDA-MB-231) and
carcinoma of the uterine cervix (HeLa) in the c = 0.01–
30 μM concentration range. The results suggest that these
compounds are promising for application in biomedicine as
anticancer drugs in the design of new effective preparations.
The antimicrobial and anticancer activity may be related to the
peculiar structural and dynamical properties revealed for the
Cu(II) complexes, by a computer aided analysis of the electron
paramagnetic resonance (EPR) spectra. This analysis indicated
the formation, at the lowest Cu(II) concentrations, of a
flexible rhombic Cu-N4 coordination with the internal amino
groups of the dendrimer, which transformed into a Cu2-N4
coordination already at 0.25 equiv. of Cu(II)
Prediction of Two-Dimensional Phase of Boron with Anisotropic Electric Conductivity
No full textTwo-dimensional (2D) phases of boron are rare and unique. Here we report a new 2D all-boron phase (named the it phase) that can be grown on a W(110) surface. The pi phase, composed of four-membered rings and six-membered rings filled with an additional B atom, is predicted to be the most stable on this support. It is characterized by an outstanding stability upon exfoliation off of the W surface, and unusual electronic properties. The chemical bonding analysis reveals the metallic nature of this material, which can be attributed to the multicentered pi-bonds. Importantly, the calculated conductivity tensor is anisotropic, showing larger conductivity in the direction of the sheet that is in-line with the conjugated pi-bonds, and diminished in the direction where the pi-subsystems are connected by single sigma-bonds. The pi-phase can be viewed as an ultrastable web of aligned conducting boron wires, possibly of interest to applications in electronic devices.CSST Scholarship; Postdoctoral Fellowship of the Basque Country [POS 2015 1 0008]; NSF-CAREER [CHE1351968]; Department of Defense; UCLA-IDRE clusterSCI(E)ARTICLE61224-1228
IR, Raman and SERS spectra of propantheline bromide
No full textThe two known propantheline bromide polymorphs (form I and form II) were studied and characterized
by a multianalytical approach. In the present work, the identification of propantheline bromide polymorphic
forms through vibrational IR spectroscopies are presented and for the first time Raman microscopy
and hot stage Raman microscopy (HSRM) studies are reported. Finally, quantum mechanical calculations
were performed. For assisting the assignment of the experimental picks, the two IR spectra of the most
and least stable representatives of a set of 56 conformers are calculated and studied.
DSC thermograms data, are also reported. The surface enhanced Raman scattering (SERS) spectrum was
also recorded in a silver colloid; it could be inferred that propantheline bromide is adsorbed on silver colloid
through the oxygen atom with the molecular plane perpendicular to the metal surface
A novel benzofurazan-cyclam conjugate and its Cu(II) complex: Synthesis, characterization and in vitro cytotoxicity and antimicrobial activity.
No full textA W-Band On-Wafer Active Load-Pull System Based on Down-Conversion Techniques
No full textA new W-band active load-pull system is presented. It is the first load-pull system to implement a 94 GHz load by means of an active loop exploiting frequency conversion techniques. The active loop configuration demonstrates a number of advantages that overcome the typical limitations of W-band passive tuners or conventional active open loop techniques in a cost effective way: load reflection coefficients Γ L as high as 0.95 in magnitude can be achieved at 94 GHz, thus providing a nearly full coverage of the Smith Chart. Possible applications of the setup include technology assessment, large-signal device model verification at sub-THz frequencies, and W-band MMIC design and characterization. The availability of direct and accurate load-pull measurements at W-band should prove an asset in the development of sub-THz integrated circuits. First measure- ments performed on high performance InP double heterojunction bipolar transistors (DHBTs) and GaN high electron mobility transistors (HEMTs) are presente
Een opblaasbare Maria: religieuze motieven tussen kunst en religie
No full text‘Religieuze kunst' bestaat niet meer: kunst thematiseert religie door het lenen van religieuze motieven
Imperiets barn – ett reportage
No full textI Imperiets barn avdekker journalist og forfatter Liza Alexandrova-Zorina Sveriges post-Sovjetiske skyggesamfunn. Her får en møte historier fra en parallell virkelighet til det sosialdemokratiske Skandinavia flest kjenner til – en virkelighet som består av overlevelse, utnyttelse, og overarbeid. Det som forener «imperiets barn» i Sverige handler ikke lenger kun om ens slaviske røtter, eller kultur. Det handler om et felles ønske om overlevelse, og bedre kår.
In Imperiets barn (Children of the Empire), journalist and author Liza Alexandrova-Zorina uncovers Sweden's post-Soviet shadow society. Here, one encounters stories from a parallel reality to the social-democratic Scandinavia most people are familiar with – a reality characterized by survival, exploitation, and overwork. What unites the 'children of the empire' in Sweden is no longer just their Slavic roots or culture. It is about a shared desire for survival and better living conditions
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