Optimization of an Electromagnetic Energy Harvesting Device

This paper presents the modeling and optimization of an electromagnetic-based generator for generating power from ambient vibrations. Basic equations describing such generators are presented and the conditions for maximum power generation are described. Two-centimeter scale prototype generators, which consist of magnets suspended on a beam vibrating relative to a coil, have been built and tested. The measured power and modeled results are compared. It is shown that the experimental results confirm the optimization theory

Oh Little Daisy Growing Wild

O! little daisy growing wild,Edged with crimson dye,Thou mindst me when I was a child,And mak\u27st me heave a sigh! When in the meadows gay I strayed,Adorn\u27d with many a flow\u27r,When in the meadows gay I strayed,Adorn\u27d Adorn\u27d with many a flow\u27r,I measur\u27d not, I measur\u27d not the hour. O! little daisy growing wildEdged with crimson dyeThough mind\u27st me when I was a child And mak\u27st me heave a sigh!And mak\u27st me heave a sigh! Those days to mem\u27ry ever dear,Oft have I in reviewWhen soon forgot each silly tear,And smiles return\u27d anew.Say why amongst ten tousand flow\u27rs I lov\u27d thee best of all,And why past and happy hoursThe rose can ne\u27er recallThe rose the rose can ne\u27er recallThe rose the rose can ne\u27er recall. O! little daisy growing wild,Edged with crimson dye,Thou mindst me when I was a child,And mak\u27st me heave a sigh.And mak\u27st me heave a sigh

Supercurrent through grain boundaries in the presence of strong correlations

Strong correlations are known to severely reduce the mobility of charge carriers near half-filling and thus have an important influence on the current carrying properties of grain boundaries in the high-$T_c$ cuprates. In this work we present an extension of the Gutzwiller projection approach to treat electronic correlations below as well as above half-filling consistently. We apply this method to investigate the critical current through grain boundaries with a wide range of misalignment angles for electron- and hole-doped systems. For the latter excellent agreement with experimental data is found. We further provide a detailed comparison to an analogous weak-coupling evaluation.Comment: 4 pages, 3 figure

Demographics of hip dysplasia in the Maine Coon cat

Objectives The aim of this study was to report the demographics of feline hip dysplasia (FHD) in the Maine Coon cat. Methods The complete hip dysplasia registry (public and private) collected by the Orthopedic Foundation for Animals through April 2015 was accessed. There were 2732 unique cats; 2708 (99.1%) were Maine Coons, and only these were studied. Variables analyzed were sex, month/season of birth and hip dysplasia score. Two groups were created: those with and without FHD. P <0.05 was considered statistically significant. Results The youngest cat with FHD was 4 months of age. The majority of the radiographs (2604/2708 [96.2%]) were performed between 4 and 60 months of age. Non-borderline scores for these 2604 cats were available in 2548, and were the data used for this study. The overall prevalence of FHD was 24.9% (635/2548), and was slightly higher in males (279/1023 [27.3%]) than females (356/1525 [23.3%]) (P = 0.025). Those with more severe dysplasia were older. The percentage of bilateral FHD was 56%, and bilateral cases had more severe dysplasia than unilateral cases but with no age difference. Month/season of birth or geographic region of origin did not influence the prevalence of FHD. Conclusions and relevance This is the largest demographic study of FHD in the Maine Coon cat. The overall prevalence in the Orthopedic Foundation for Animals registry was 24.9%, and slightly higher in males (27.3%) than females (23.3%). Dysplasia was more severe in bilateral than unilateral cases and with increasing age. Caution should be used when extrapolating these findings to other feline breeds or other groups of Maine Coon cats. Further studies need to be performed among other breeds and geographic locations to better understand the demographics of feline hip dysplasia

Ten Years Ago

Ten years ago in this place we met; we meet as kindly now, we meet as kindly now.For Time for Time hath but little chang\u27d us yet, youth\u27s joyous lip and borw, youth\u27s joyous lip and brow.Above us the tree, the tree a canopy weaves, \u27tis a fanciful thought I know, \u27tis a fanciful thought I knowBut I almost could think they\u27re the same green leaves that were here Ten years ago! that were here Ten years ago! Ten years ago yet each word and look; are fresh as if just gone by are fresh as if just gone by;They were tracd they were trac\u27d in memry\u27s treasure book,And the ink seems scarcely dry, the ink seems scarcely scarcely dry. The Mariner\u27s bark, the bark has encounter\u27d storms, From his lip no complaint shall flow, From his lip no complaint shall flowIf the bark be but mann\u27d by the same gay forms that were here Ten years ago

Disorder Induced Stripes in d-Wave Superconductors

Stripe phases are observed experimentally in several copper-based high-Tc superconductors near 1/8 hole doping. However, the specific characteristics may vary depending on the degree of dopant disorder and the presence or absence of a low- temperature tetragonal phase. On the basis of a Hartree-Fock decoupling scheme for the t-J model we discuss the diverse behavior of stripe phases. In particular the effect of inhomogeneities is investigated in two distinctly different parameter regimes which are characterized by the strength of the interaction. We observe that small concen- trations of impurities or vortices pin the unidirectional density waves, and dopant disorder is capable to stabilize a stripe phase in parameter regimes where homogeneous phases are typically favored in clean systems. The momentum-space results exhibit universal features for all coexisting density-wave solutions, nearly unchanged even in strongly disordered systems. These coexisting solutions feature generically a full energy gap and a particle-hole asymmetry in the density of states.Comment: 28 pages, 8 figure

The epiphyseal tubercle in adolescent hips

Background It has already been shown in animals and using anatomical human specimens that chronic slippage of the adolescent upper (capital) femoral epiphysis is unlikely to take place by shearing due to the presence of an epiphyseal tubercle projecting down into the metaphysis