1,908 research outputs found
Samuelis Marolois opus mathematicum / Ioannis Vredemanni Frisii ... Architectura : continens quinque ornamenta architecturae, scilicet Atticum, Ionicum, Doricum, Corinthium, & Compositum : item regulas, demonstrationes ac figuras perfectissimas : opus mathematicis, architectis, pictoribus ac lapicidis perutile ac necessarium
No full textstudio atque opera summi mathematici Samuelis Marolois recognitum atque illusttatumDruckermark
Samuelis Marolois opus mathematicum / Perspectiva theoretica ac practica, hoc est, opus opticum absolutissimum : continens aedificiorum, templorum, pergularum aliarumque structurarum perfectissima fundamenta, icones atque delineamenta : iuxta veterum ac recentiorum autorum doctrinam accurate exaratum
No full textEnthält Ioannis Vredemanni Frisii Perspectivae pars IIstudio atque opera Ioannis Vredemanni Frisii ; multis vero notis illustratum per Samuelem MaroloisDruckermarkeDruckjahr des zweiten Teils: 163
Choro arabesque (Lantana Lovers)
No full textDoug de Vries, guitar & ensemble. Editions DdV 603ABC Classic FMOff-air broadcast recording. Copied under Part VA of the Copyright Ac
Samuelis Marolois, ... Mathematicum opus absolutissimum
No full text[10] h., [30] h. dobles de lám. ; Fol.[ ]1, A1, B2, C1, D2, E1, F-H2, I1, K-M2, N1, O-Q2, R1, S-V2, X1, Y-Z2, AA2, AA2-OO2. -- Texto en h. independientes intercaladas entre las h. de lám., todas con sign. correlativas -- La sign. de las h. dobles de lám. aparece en la parte inferior derecha de las estampas, i.e. en la segunda hoja.Marca tip. xil. en port. -- Las lám. son 30 grab. calc. a doble pág. en la cara interior de todos los bifolios (excepto A2 y B2 de prelim.), algunos firmados por Johannes o Paul Vredeman de Vries y el grabador Henricus Hondius
Koolen-de Vries Syndrome: a journey from diagnosis to treatments
No full textThe Koolen-de Vries Syndrome Foundation was founded in 2013 with the mission to educate, increase awareness, promote research and develop treatments for individuals living with Koolen-de Vries Syndrome (KdVS) and their families. With this aim, the foundation has focused on: developing scientific resources through patient cell and animal models, providing seed funding to basic and clinical researchers, establishing a natural history study of KdVS and increasing patient engagement. Projects have been prioritized across these areas of focus with an emphasis on expanding international research on KdVS, supporting translational research, establishing an international natural history study and conducting studies to assess patient priorities. With the incredible growth amongst our research and patient community in the last decade, our goal is to have our first clinical trial for KdVS in 2026
de Vries Behavior in Smectics near a Biaxiality Induced Smectic A - Smectic C Tricritical Point
No full textWe show that a generalized Landau theory for the smectic A and C phases exhibits a biaxiality induced AC tricritical point. Proximity to this tricritical point depends on the degree of orientational order in the system; for sufficiently large orientational order the AC transition is 3D XY-like, while for sufficiently small orientational order, it is either tricritical or 1st order. We investigate each of the three types of AC transitions near tricriticality and show that for each type of transition, small orientational order implies de Vries behavior in the layer spacing, an unusually small layer contraction. This result is consistent with, and can be understood in terms of, the “diffuse cone” model of de Vries. Additionally, we show that birefringence grows upon entry to the C phase. For a continuous transition, this growth is more rapid the closer the transition is to tricriticality. Our model also predicts the possibility of a nonmontonic temperature dependence of birefringence
Breather lattice and its stabilization for the modified Korteweg-de Vries equation
No full textWe obtain an exact solution for the breather lattice solution of the modified Korteweg-de Vries equation. Numerical simulation of the breather lattice demonstrates its instability due to the breather-breather interaction. However, such multibreather structures can be stabilized through the concurrent application of ac driving and viscous damping terms
Design and Investigation of de Vries Liquid Crystals Based on 5-Phenyl-Pyrimidine and (R,R)-2,3-Epoxyhexoxy backbone.
No full textCalamitic liquid crystals based on 5-phenyl-pyrimidine derivatives have been designed, synthesized, and characterized. The 5-phenyl pyrimidine core was functionalized with a chiral (R,R)-2,3-epoxyhexoxy chain on one side and either siloxane or perfluoro terminated chains on the opposite side. The one involving a perfluorinated chain shows SmA^{*} phase over a wide temperature range of 82 °C, whereas the siloxane analog exhibits both SmA^{*} and SmC^{*} phases over a broad range of temperatures, and a weak first-order SmA^{*}-SmC^{*} transition is observed. For the siloxane analog, the reduction factor for the layer shrinkage R (relative to its thickness at the SmA^{*}-SmC^{*} transition temperature, T_{AC}) is ∼0.373, and layer shrinkage is 1.7% at a temperature of 13 °C below the T_{AC}. This compound is considered to have de Vries smectic characteristics with the de Vries coefficient C_{deVries} of ∼0.86 on the scale of zero (maximum-layer shrinkage) to 1 (zero-layer shrinkage). A three-parameter mean-field model is introduced for the orientational distribution function (ODF) to reproduce the electro-optic properties. This model explains the experimental results and leads to the ODF, which exhibits a crossover from the sugar-loaf to diffuse-cone ODF some 3 °C above T_{AC}
Dielectric Spectroscopy of De Vries Smectic Liquid Crystals
No full textIn this experiment we used dielectric spectroscopy to observe the dielectric response of two De Vries liquid crystals; W-652 and W-751. A frequency sweep was run for each sample with various electric fields applied using an AC current. The samples demonstrated opposing effects at the SmA to SmC as the electric fields were increased. The W-751 showed an increased response with an increased electric field and a resonance peak in high frequencies that shifted through the transition, although there were no clear results in the low frequency range so there is no conclusive trend. The W- 652 sample opposed the expected results of a DeVries liquid crystal and decreased response with an increased voltage. This effect is a unique property of the sample and further analysis is out of the scope of this experiment
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