2,181 research outputs found
Flora Enes Beaudoin
No full textFlora Flo Enes Beaudoin, a longtime Palo Alto resident and dance teacher, died on June 1. She was 102. She was born on March 10, 1913, in Calgary, Alberta, Canada, to Joseph and Amelia Basso. The family came to the U.S. in 1915, settling in the Menlo Park-Atherton area. In 1941, she married Heston M. Beaudoin, a Palo Alto resident. Together she and Heston taught dance for the rest of their lives, imparting performance skills, coordination, teamwork, self-appreciation and social skills, particularly for the young. They also served as dance teachers and choreographers for productions by civic organizations, including Elks, Masons and the Junior Artist Guild. In the '80s, they became cruise directors and entertainers that traveled around Cape Horn and the Panama Canal. Having studied the Cecchetti Method of ballet, Flo made use of those skills at their studio, which was called Beaudoin's School of Dance. She was a lifetime member of the Dance Masters of California and the Dance Masters of America, holding leadership roles in both organizations. She was preceded in death by her parents her husband, Heston and her son, Billie. She is survived by her son, Ross (Renata) Beaudoin of Independence, Missouri her grandchildren, Chuck (Kimberly) Beaudoin, Denise (Dennis) Daugherty, Tom (Martina Verba) Beaudoin, Annette Delce, John Beaudoin and Stephen Beaudoin and her great-grandchildren, Crystal, Charles, Juliette, Amelia and Adaline. She is also survived by her sister, Valeria Pakaski of Palo Alto, and her niece, Sandra (Edward Trischmann) Pakaski
Investigation of nucleation and crystal growth kinetics of nickel manganese oxalates
Get PDFThe nucleation and the crystal growth rates of mixed nickel manganese oxalates have been determined from the changes of the ionic concentration of the solution and the crystal size distribution during the precipitation process within a supersaturation range 0–0.1 M. Thermodynamic solubility calculations have been used to identify the different species contributing the precipitation reaction and for estimation of the thermodynamic constant. Experimental data show that the nucleation rate of mixed nickel manganese oxalate in this supersaturation range is consistent with a primary heterogeneous mechanism and was found to obey to an exponential law. The crystal growth rates indicate a surface-integration-controlled mechanism with a first-order law with respect to the supersaturation
Copper-based coordination polymers from thiophene and furan dicarboxylates with high isosteric heats of hydrogen adsorption
No full textSelf-assembled Cu-based coordination polymers derived from thiophene-2,5-dicarboxylic acid (Cu-TDC) and furan-2,5-dicarboxylic acid (Cu-FDC) were synthesized via a solvothermal method and their H2 adsorption behaviour was investigated and contrasted with isophthalic acid (Cu-m-BDC) and terephthalic acid (Cu-BDC) derivatives. Both heterocyclic-based coordination polymers exhibit low surface areas (<300 m2 g?1) upon activation but unusually high isosteric heats of hydrogen adsorption (7.5–9.2 kJ mol?1). Hydrogen uptake values of 0.64–0.75 wt% (77 K and 1 bar) were recorded and these high uptake values are attributed to the optimal pore size (5.4–8 Å) and the polarizability of the 5-membered heterocycles.ChemE/Catalysis EngineeringApplied Science
The optical properties of automatically darkening welding filters based on liquid crystal technology
Get PDFThis thesis addresses the problem of the poor optical angular properties displayed by the majority of automatically darkening welding filters currently on the market that are based on liquid crystal technology. It is shown that by reducing the twist-angle present in the liquid crystal cell to below that of 90 together with employment of a novel polariser arrangement, an optical shutter design based on a double-cell construction is obtained that boasts a reduced angular transmittance variation when in the activated phase. This gives an optical filter possessing a wide central viewing cone whilst maintaining the remaining optical parameters at a high level. The only point of compromise comes from the voltage increase requirement upon reduction of the twist- angle in order to maintain cell contrast. Although this inflates the power consumption of the system, beneficial effects upon the total light scattering provoked by the device are also observed. The final sections deal with a new mode of operation for a twisted-nematic liquid crystal cell when placed between crossed polarisers together with an interference filter possessing a high optical transmittance over the central part of the visible spectrum. This mode of operation means that the cell is in a dark state when inactivated. Application of a small stimulating voltage transmutes the unit into the light state, where upon further increment of the driving electronics beyond this point reverts the system back into a low transmittance phase. Such a mode of operation for a twisted-nematic cell offers several advantages over that of the normally white mode when considering the optical lens of an automatically darkening welding filter. In particular, a dark, fail-safe state is provided should the controlling electronics malfunction preventing the unit from holding in a potentially hazardous light phase, a property usually associated with the normally black mode of operation, whilst the fast switching speed from the light to the dark state associated with the normally white mode of operation is maintained. It is shown that there are only two cell types that display this phenomenon and the optical properties of these two systems are analysed in some detail with the view of developing an automatically darkening welding filter based on this technology. This thesis is submitted to the University of Durham for the degree of Master of Science. All work contained within this thesis was carried out by the author at Hornell Innovation AB in Sweden. No material contained within has been submitted for a previous degree and the copyright of this thesis rests with the author. No quotation from it should be published without his prior written consent and information derived from it should be acknowledged
Modification of Loop 1 Affects the Nucleotide Binding Properties of Myo1c, the Adaptation Motor in the Inner Ear
Get PDFMyo1c is one of eight members of the mammalian myosin I family of actin-associated molecular motors. In stereocilia of the hair cells in the inner ear, Myo1c presumably serves as the adaptation motor, which regulates the opening and closing of transduction channels. Although there is conservation of sequence and structure among all myosins in the N-terminal motor domain, which contains the nucleotide- and actin-binding sites, some differences include the length and composition of surface loops, including loop 1, which lies near the nucleotide-binding domain. To investigate the role of loop 1, we expressed in insect cells mutants of a truncated form of Myo1c, Myo1c1IQ, as well as chimeras of Myo1c1IQ with the analogous loop from other myosins. We found that replacement of the charged residues in loop 1 with alanines or the whole loop with a series of alanines did not alter the ATPase activity, transient kinetics properties, or Ca2+ sensitivity of Myo1c1IQ. Substitution of loop 1 with that of the corresponding region from tonic smooth muscle myosin II (Myo1c1IQ-tonic) or replacement with a single glycine (Myo1c1IQ-G) accelerated the release of ADP from A.M 2?3-fold in Ca2+, whereas substitution with loop 1 from phasic muscle myosin II (Myo1c1IQ-phasic) accelerated the release of ADP 35-fold. Motility assays with chimeras containing a single ?-helix, or SAH, domain showed that Myo1cSAH-tonic translocated actin in vitro twice as fast as Myo1cSAH-WT and 3-fold faster than Myo1cSAH-G. The studies show that changes induced in Myo1c via modification of loop 1 showed no resemblance to the behavior of the loop donor myosins or to the changes previously observed with similar Myo1b chimeras
Effects of crystal defects on the electrokinetics of nanofluidic crystal
No full textNanofluidic crystal (NFC) is attracting research interest as a novel nanofluidic material due to its various advantages over traditional microfabricated nanochannels. Crystal defects form during the self-assembly of NFC. In this work, we investigated the effects of crystal defects on the electrokinetics of NFC in the domain of micrometers (1-100 mu m). We found that conductance of NFCs self-assembled in square micropores with lateral lengths of 10-90 mu m all demonstrated conductance of a typical nanofluidic nanochannel. However, conductivity degraded dramatically with the increase of micropore sizes. At low concentrations where electrical double layers (EDLs) dominated the conductivity, conductivity dropped to only 20% from 10 to 90 mu m micropores.Engineering, BiomedicalEngineering, Electrical & ElectronicNanoscience & NanotechnologyEICPCI-S(ISTP)
Hygiene and Welfare in the Dairy and Beef Industries
No full textInstituting Hygienic Practices to be used on the Cattle FarmFall 2012Accompanied by video fil
Crystal structure determination of new compounds Li6MB3O9 (M= Nd, Sm, Eu, Tm, Er)
No full textNew compounds Li6MB3O9 (M=Nd,Sm,Eu,Tm,Er) were synthesized by solid-state reaction. The crystal structure of Li6NdB3O9 was analyzed from both powder and single crystal X-ray diffraction data. The results obtained by powder diffraction analysis and Rietveld refinement are a=7.2725(4) angstrom, b=16.6398(9) angstrom, c=6.7529(5) angstrom, beta=105.398(8)degrees, and space group P2(1)/c, which agree with the results obtained by single crystal diffraction analysis: a=7.2712(4) angstrom, b = 16.6268 (9) angstrom, c = 6.7484(4) angstrom, beta=105.411 (1)degrees, and space group P2(1)/c. This compound is isostructural with Li6YB3O9, Single crystal structure analysis showed that the fundamental building unit of these isostructural compounds comprises three isolated [BO3](3-) triangles, one distorted [NdO8](13-) triangulated dodecahedron, four distorted [LiO5](9-) five-coordinated polyhedra, and two [LiO4](7-) tetrahedron. An analysis of the infrared spectrum of Li6NdB3O9 confirmed the presence of isolated [BO3](3-) triangles in Li6NdB3O9. The remaining four Li6MB3O9 (M=Nd, Sm, Eu, Tm, and Er) compounds were found to be isostructural with Li6NdB3O9. Their unit cell dimensions decrease with an increase in the atomic number of the rare-earth atoms. DTA and TGA measurements of Li6MB3O9 (M=Nd, Sm, Eu, Tm, and Er) revealed that these borates congruently melt from 800 degrees C to 860 degrees C. (c) 2008 International Centre for Diffraction Data.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000253850900003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Materials Science, Characterization & TestingSCI(E)2ARTICLE13-92
Liquid crystal wavefront corrector on silicon
No full textA reflective-type liquid crystal (LC) wavefront corrector with modal addressing is described. The corrector’s backplane has an array of pixel electrodes interconnected by a network of discrete resistors. The resistive network serves to form the local voltage profile that controls the phase distribution generated in the liquid crystal layer. This design is realized in a bipolar silicon technology. Preliminary numerical analysis is presented; technology and experimental results are discussed.Electronic Instrumentation LaboratoryElectrical Engineering, Mathematics and Computer Scienc
New Deep-Blue-Emitting Ce-Doped A<sub>4- m</sub>B<sub>n</sub>C<sub>19+2 m</sub>X<sub>29+ m</sub> (A = Sr, La; B = Li; C = Si, Al; X = O, N; 0 ≤ m ≤ 1; 0 ≤ n ≤ 1) Phosphors for High-Color-Rendering Warm White Light-Emitting Diodes
No full textA new sialon Eu3.60LiSi13.78Al6.03O6.82N22.59 has been discovered via the single-particle diagnosis approach. Its crystal structure (space group P3m1) was solved and refined from single-crystal X-ray diffraction data. It has the interesting feature of two types of disorder at the Eu2 site: positional disorder (Eu2a/Eu2b) and substitutional disorder with (Si/Al)2(O/N). The structure is generalized to the formula A4-mBnC19+2mX29+m (A = Sr, La, Eu, Ce; B = Li; C = Si, Al; X = O, N; 0 ≤ m ≤ 1; 0 ≤ n ≤ 1), of which Sr3.61LiSi14.27Al5.61O6.19N23.25 (Sr-sialon, m = 0.41, n = 1) and La2.85Sr0.76LiSi14.86Al4.93O2.89N26.51 (LaSr-sialon, m = 0.40, n = 1) are two examples that have been obtained as a single-phase powder. Sr-sialon:Eu and LaSr-sialon:Eu both show blue to yellow emission, depending on the Eu concentration, whereas Sr-sialon:1% Ce shows a deep-blue emission band centered at 422 nm with a full width at half-maximum of 80 nm and an internal quantum efficiency of 80% (λex = 355 nm). The latter phosphor has very good thermal stability of both emission intensity and color. A white light-emitting diode (LED) containing the newly discovered Sr-sialon:5% Ce as the blue phosphor component shows excellent color-rendering indices (Ra = 96 and R12 = 97) with a correlated color temperature of 4255 K. This indicates that Sr-sialon:Ce is a highly promising deep-blue phosphor for illumination grade white LEDs.Accepted Author ManuscriptChemE/Product and Process Engineerin
- …
