3,570 research outputs found
Scott Heim, 34th Annual ODU Literary Festival
No full textScott Heim is the author of the HarperCollins novels We Disappear, In Awe, and Mysterious Skin, which was made into a 2005 film by Gregg Araki. He has won fellowships from the Sundance Screenwriters Lab and the London Arts Board. Originally from Kansas, Scott lived in New York for 11 years before moving to Boston in 2003. At present he is working on a screenplay and a new novel. His official website is www.scottheim.com
Demand For Durable Goods, Nondurable Goods And Services
No full textSeparate macroeconomic consumption demand functions are developed and tested for (1) durable goods, (2) nondurable goods and (3) services. These are compared for consistency with econometric studies of total consumer demand. Key factors determining demand for these goods are tested using U.S. 1960 - 2000 data. The econometric method used was 2SLS with heteroskedasticity controls. Data in first differences are used to reduce multicollinearity, non stationarity and autocorrelation. The models explain 94% of the variance in demand for consumer durables, 86% of demand for nondurable consumer goods and 81% of services demand. Demand for durables like autos and appliances, was found to be driven by the disposable income, wealth, the exchange rate, availability of consumer credit, interest rates on consumer credit, demand for new housing, which affects appliance demand, and population growth. Demand for nondurable goods, such as groceries and clothes, was driven by the same factors, except for new housing demand and the exchange rate. Demand for consumer services such as laundry, restaurant, and entertainment services was found to be related to disposable income, wealth, and population growth, but not related to consumer credit availability, or consumer credit interest rates. However, mortgage interest rates paid by households did seem to affect the demand for services.
Do Deficits Crowd Out Private Borrowing? Evidence From Flow Of Funds Accounts
No full textHeim (2010) found a strong negative relationship between deficits and private consumer and investment spending, controlling for other key variables. The study did not directly test the mechanism by which deficits were related to consumer and investment spending, only the result. Crowd out theory hypothesizes the mechanism is consumer and investment credit shortages induced by borrowing -financed government deficits. This paper examines that mechanism directly, testing to see if private borrowing is related to deficits. It uses Federal Reserve Flow of Funds accounts data on borrowing. The paper finds a strong negative relationship between deficits and private borrowing, with deficits reducing private borrowing dollar for dollar. The borrowing estimates are very similar to the Heim (2010) estimates of deficit effects on consumer and investment spending, suggesting crowd out effects work through the borrowing channel and fully offset the stimulus effects of deficits. Flow of Funds data on savings and investment, for accounting reasons, confirm the econometric findings of full crowd out, provided savings remain constant.
Analysing the EO4GEO Body of Knowledge from the perspective of a public authority
No full textauthor: Prisca Heim, BSc.Literaturverzeichnis: Blatt 73-75Masterarbeit University of Salzburg 202
Space-Varying Coefficient Models for Diffusion Tensor Imaging using 3d Wavelets
No full textIn this paper, the space-varying coefficients model on the basis of B-splines (Heim et al., (2006)) is adapted to wavelet basis functions and re-examined using artificial and real data. For an introduction to diffusion tensor imaging refer to Heim et al. (2005, Chap. 2). First, wavelet theory is introduced and explained by means of 1d and 2d examples (Sections 1.1 { 1.3). Section 1.4 is dedicated to the most common thresholding techniques that serve as regularization concepts for wavelet based models. Prior to application of the 3d wavelet decomposition to the space-varying coe cient elds, the SVCM needs to be rewritten. The necessary steps are outlined in Section 2 together with the incorporation of the positive de niteness constraint using log-Cholesky parametrization. Section 3 provides a simulation study as well as a comparison with the results obtained through B-splines and standard kernel application. Finally, a real data example is presented and discussed. The theoretical parts are based on books of Gen cay et al. (2002, Chap. 1, 4-6), Härdle et al. (1998), Ogden (1997) and Jansen (2001) if not stated otherwise
Heim (J.L.), 1982. Les Hommes fossiles de la Ferrassie. T. II.
No full textHeim (J.L.), 1982. Les Hommes fossiles de la Ferrassie. T. II.. In: Bulletins et Mémoires de la Société d'anthropologie de Paris, XIII° Série. Tome 9 fascicule 4, 1982. pp. 347-348
Heim (J.L.), 1982. Les Hommes fossiles de la Ferrassie. T. II.
No full textHeim (J.L.), 1982. Les Hommes fossiles de la Ferrassie. T. II.. In: Bulletins et Mémoires de la Société d'anthropologie de Paris, XIII° Série. Tome 9 fascicule 4, 1982. pp. 347-348
Influence of the binder composition on the water debinding properties of a PVB-PEG-alumina feedstock for the fused deposition of ceramic process
No full textThe study investigates the influence of several binder compositions on the solvent debinding characteristics of highly filled thermoplastic alumina feedstocks at different temperatures. All feedstocks contain the same powder volume fraction but vary in the repartition of the binder components: polyvinyl butyral (PVB), polyethylene glycol (PEG), and a plasticizer (3G8). The weight loss, debinding speed, volumetric changes, and the microstructure were analyzed. The water temperature was set to room temperature -RT- (23 degrees C) and 40 degrees C. SEM micrographs were taken on as-processed and solvent-debinded samples fractured after dipping in liquid nitrogen. Water debinding of the compositions with high proportions of low molecular weight components PEG and 3G8 helps to reduce the remaining polymer amount and to achieve an open porosity, which should ease the following thermal debinding
McKittrick quadrangle : [Geologie]
No full textR. B. Marshall ; T. G. Gerdine ; G. R. Davis [et al.] ; [handkoloriert von Arnold Heim]Grundlage: Topographische Karte der USA 1:125 000Handkolorier
Tethya leysae Heim & Nickel, 2010, sp. nov.
No full textTethya leysae sp. nov. Holotype: NHM 2009.5. 1.1, Leg. Sally P. Leys, 25.06. 2003. Paratype: PMJ Porif 287, Leg. Sally P. Leys, 27.09. 2006 Type locality: Rocky hard bottom substrate in the shallow Infralittoral (10 - 25 m depth) near Ohiat Islet, Northeast Pacific, Barkley Sound, Bamfield, Vancouver Island, British Columbia, Canada (Fig. 1), coordinates 48 ° 51 ’3.00’’ N, 51 ’ 3 ’’ 125 ° 11 ’60.00’’ W. Diagnosis. Tethya leysae sp. nov. is the only Tethya species in the NE Pacifc possessing a massive uniform cortex with few lacunae and densely packed megasters (oxyspherasters 41-115 µm; R/C 0.41), which are larger and display shorter rays compared to T. californiana. It also lacks the alveolar exocortex and the bilayered megastrer distribution typical for T. californiana; Two categories of oxeas/strongyloxeas, both slightly larger/thicker than in T. californiana: main (1580-2540 µm x 18-53 µm) and auxiliary (490-1490 µm x 7–30), lacking tylostrongyles. Etymology. We have chosen the name in honor of Prof. Dr. Sally P. Leys, Edmonton, BC, Canada, who collected and kindly provided the type specimens and is an inspiring colleague and friend. Description. General body morphology. The body is spherical, with a diameter of 5 x 4 cm (holotype; Fig 2 A). Sections show an unambiguous division into a cortex region and a choanosomal core (Fig. 3 A). The colour in life is orange-yellow to light red (Fig. 2 C). The colour in alcohol is white, with a greyish core (Fig. 2 A). In living specimens, the body is slightly contractile. However, the overal body consistency is incompressible. The verrucose surface is frequently loaded lightly with sediment. The surface lacks tubercles, filaments and stalked buds (at least they have not been found in the examined material). The cortex is dense and compact, with 3-6 mm in thickness. It lacks lacunae, but is packed with megasters (Figs. 3 and 4). Skeletal morphology. The dense radiate bundles of main megascleres (oxeas and strongyloxeas) display diameters between 400–600 µm (see sections, Fig. 3 C, F; and microtomographic reconstructions, Fig. 4 A, B). The bundles terminate in compact cortical fans which are formed by the main and auxiliary megascleres and make up broad cortical tubercles (Figs. 3 B) which contribute to the external verrucose appearance. Groups of auxiliary megascleres are also present interstitially in the choanosome between the main bundles (Fig. 3 C). The megasters (spherasters/oxyspherasters) are evenly and densely scattered throughout the whole cortex (Figs. 3 B, 3 F, 4), but almost lacking in the peripheral 200–500 µm of the cortex (Fig. 3 D) and in some basal parts of the cortex near the cortical-choanosomal boundary (Fig. 3 E). Micrasters form a discrete layer allocated in the exopinacoderm surface (Fig. 3 D) and are most dense in the peripheral cortex. In addition, micrasters are evenly but sparsely distributed throughout the cortex and the choanosome. Spicules. The main megascleres are constituted by oxeas, anisostrongyles and strongyloxeas (Fig. 5), 1580–2540 µm (2049 ± 259 µm; n= 40) in length, 18–53 µm (34 ± 7 µm; n= 40) in diameter. Auxiliary megascleres are constituted by oxeas, anisostrongyles and strongyloxeas, 490–1490 µm (1055 ± 215 µm; n= 128) in length, 7–30 µm (19 ± 5 µm; n= 128) in diameter. Main and auxiliary megascleres form two significantly different length categories (independent t-test, p<0.001; Fig. 6 B), both of normal distribution (Kolmogorov-Smirnov test). The megasters are represented by spherasters to oxyspherasters of varying size and morphology, as evidenced by SEM and microtomography reconstructions (Figs. 5 B, C, 6 A and 7 C, Tab. 1). Cortical megasters (Fig. 5 B) display 8–20 rays and are 41–115 µm (84 ± 12 µm; n= 40) in diameter with R/Cs of 0.34– 0.69 (0.46 ± 0.07; n= 227). Choanosomal megasters (Fig. 5 C) display 12–18 rays and are 24–81 µm in diameter, with R/Cs of 0.25–0.81 (0.41 ± 0.1; n= 85). The form of the rays varies in both regions from slender to stout (Fig. 5 B, C). A Kolmogorov-Smirnov test (independent t-test, p<0.001) suggests that choanosomal oxyspherasters size is significantly smaller than in cortical megasters. Micrasters (Fig. 5 D) fall into four categories: acanthoxyspherasters (Fig 5 D, top left), 10–19 µm in diameter with 10–12 rays (the main category); acanthostrongylasters (Fig. 5 D, top middle) 8–18 µm in diameter, with 8–12 rays; a few acanthotylasters with only slight terminal knobs (Fig. 5 D, top right), 6–8 µm in diameter, with 10–14 slightly spinulated rays; and small oxyspherasters (Fig. 5 D, bottom), 4–10 µm in diameter, with 10–15 slender rays. Molecular characters. The nucleotide sequences of the cytochrome oxidase subunit I (Folmer fragment) are accessible in Genbank (holotype: GQ 292532; paratype: GQ 292533) and at www.spongebarcoding.org (record no. 222). The base pair exchanges in the COI fragment and the deduced amino acid sequences (Tab. 2) clearly distinguish T. leysae sp. nov. from T. californiana (4 nt/ 2 aa), T. minuta Sarà, Sarà, Nickel & Brümmer, 2001 (22 nt/ 3 aa) and T. actinia (18 nt/ 3 aa). Reproduction. Asexual reproduction by bud formation near the sponge surface is indicated (Fig. 2 C; asterisks). No data exist to date on the sexual reproduction of T. leysae sp. nov. Ecology. The type habitat at Barkley Sound is infralittoral hard bottom influenced by strong tidal changes such as regular periods of strong currents. Usually, T. leysae is found in aggregates of several specimens (presumably due to asexual reproduction by budding). Larger specimens of up to 8 cm diameter sometimes cluster in sheltered small canyons of wave exposed areas. Tethya leysae sp. nov. is most abundant in depths between 15–20 m with moderate water flow but no direct wave exposure or current. It usually lives in lighted conditions and on shaded rocks, but avoids dark habitats. Specimens of T. leysae sp. nov. are frequently found to be covered by debris which might be particulate organic matter, but also algae and other small epibionts like foraminifers. In some areas of Barkley Sound, it is the most obvious subtidal sponge. Other common sponges are Neopetrosia vanilla (de Laubenfels, 1930) and Cliona sp. (for a species list compare Austin et al. 1999 –2007). Distribution. At present, T. leysae sp. nov. has only been reported for its type locality Barkley Sound, near Bamfield, British Columbia, Canada. It is likely to occur more widely along the North American Pacific coast but its biogeographical limits are presently not known. Related species. Comparative morphology (general anatomy, skeleton structure, megasclere and microsclere sizes, forms and distribution) suggests that T. leysae sp. nov. might be closely related to T. aurantium, T. robusta (Bowerbank, 1873) and T. californiana. At present, T. californiana seems to be the only species which eventually occurs sympatrically. However, T. leysae sp. nov. can be clearly distinguished from T. californiana by the lack of an alveolar cortex and the extremely high density of megasters in the cortex. Another striking difference is the megaster morphology. Their R/C values differ significantly between T. californiana and T. leysae sp. nov. (Tab. 1) and the oxyspherasters of the latter rarely display bent rays. In addition, spherules have not been found among the micrasters of T. leysae sp. nov. However, this character can only be accessed by extensive and very careful study of spicule preparations. In addition to the morphological differences between T. californiana and T. leysae sp. nov., extensive nucleotide (4 nt) and amino acid (2 aa) exchanges are present within the molecular marker COI (Tab. 2). Tethya leysae sp. nov. also differs from T. aurantium in respect to cortex architecture, which is more massive and much more densely packed with megasters in the new species. In comparison to T. aurantium, the variance in relative ray length of the megasters is higher: while T. aurantium displays spherasters, T. leysae sp. nov. displays a range from spherasters to oxysherasters (compare data in Sarà & Melone 1965; Sarà et al. 1992). In addition to the morphological differences between T. aurantium and T. leysae sp. nov., extensive nucleotide (52 nt) and amino acid (4 aa) exchanges are present within the molecular marker COI (Tab. 2). Tethya robusta seems to be the species with the most similar cortical architecture (Bowerbank 1873; Sarà & Sarà 2004), since in both species, megasters are so closely packed “that the rays of each pass between those of the adjoining ones, and the whole become, as it were, cemented into a solid mass” (Bowerbank 1873). However, the megasters in T. robusta display a much higher number of rays (24–32) than those of T. leysae sp. nov. Both species also differ in micraster types: T. leysae sp. nov. lacks the fine rayed oxyasters of T. robusta which in turn lacks the stout acanthoxyspherasters of T. leysae sp. nov.Published as part of Heim, Isabel & Nickel, Michael, 2010, Description and molecular phylogeny of Tethya leysae sp. nov. (Porifera, Demospongiae, Hadromerida) from the Canadian Northeast Pacific with remarks on the use of microtomography in sponge taxonomy, pp. 1-21 in Zootaxa 2422 on pages 5-9, DOI: 10.5281/zenodo.19450
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