Notes on Fish of the Interior of the Labrador Peninsula

Based on biological field work in the Knob Lake region (about 55 N 67 W) of the Quebec-Labrador boundary, under the auspices of the Defense Research Board of Canada, summer 1948. Field notes on four species and a few non-specific forms; on their parasites, and features of lakes and streams in which they were found

Predictors of Bone Density in Women: A Longitudinal Study

This research was a 15-year follow-up study of the relationships of age, physical measurements, diet group (non-vegetarian, NV; vegetarian, V), use of estrogen, dietary intakes of energy, calcium, and bone density in 60 healthy postmenopausal NV (n=31) and V (n=29) women, (age range 53-92). The V group was comprised of 29 lacto-ovo-vegetarian women, the remaining 31 subjects were NV. All subjects had been participants in an earlier (1976-1979) bone density study conducted in these laboratories. Measurements of height, weight, triceps skinfold thickness (TSF), and bone density of the radius and ulna were made (single photon absorptiometry); 7-day dietary records, and 24-hr urine samples, were obtained on each subject. Mean intakes of energy and nutrients were calculated from the dietary records. The urine samples were analyzed for calcium, creatinine, and hydroxyproline (HOP). Physical parameters for the groups were similar in 1991 except for the NV showing a trend toward greater weight and body mass index (BMI) than the V group. NV had higher intakes of protein, saturated fat, cholesterol and caffeine than V. Conversely, it was the V which demonstrated higher intakes of carbohydrate and fiber than the NV. Of the 8 vitamin intakes studied, NV had the higher intake of vitamin B12 and V had the higher intake of vitamin B6. Mineral intakes were similar between NV and V except for V having the greater intake of iron. Decrements were seen in height and TSF in both NV and V over the 15-yr period. The increase in BMI for V was significant. Both NV and V exhibited decrements in intakes of energy, protein, fat, saturated fat, and cholesterol. NV caffeine intake also showed a decrement. A non-significant increase in fiber intake was seen in both NV and V. No changes were noted for vitamin intakes, except for decrements in vitamin B12 of both groups. Intakes of sodium and iron showed decrements from 1976 to 1991. Both groups met RDA\u27s except for those of calcium and zinc. Age, energy intake, body weight, dietary calcium, diet group (NV or V), protein intake, and use of estrogen were considered as predictors of bone density of the radius and the ulna; all were significant except energy and protein. Supplemental calcium was not found to contribute to bone density. At age 50 and 80 yr. predicted bone densities of the radius and ulna were greater in the NV than the V group. Use of estrogen by both diet groups increased bone density of the radius and ulna. Urinary calcium was higher in NV than V. HOP excretion did not significantly differ between NV and V. Urinary excretion of HOP and calcium were not found to be correlated current bone density or to bone loss, but creatinine excretion was negatively correlated to loss of bone density in both the NV and V groups. Creatinine excretion was greater in NV than V. It can be concluded that age, body weight, dietary calcium intake, choice of diet group, and use of estrogen are all predictors of bone density in these subjects

Phase transformations in (111) Si after spherical indentation

Phase transformations in (111) Si after spherical indentation have been investigated by cross-sectional transmission electron microscopy. Even at an indentation load of 20 mN,a phase transformation zone including the high-pressure crystalline Si phases was observed within the residual imprints. The volume of the transformation zone, as well as that of the crystalline phases increased with the indentation load. Below the transformation zone, slip was found to occur on {311} planes rather than on {111}planes, usually observed on indentation of (100) Si. The distribution of defects was asymmetric, and for indentation loads up to 80 mN, their density was significantly lower than that reported for (100) Si. The experimental observations correlated well with modeling of the applied stress through ELASTICA

Reproductive Seasonality, Fecundity, And Spawning Frequency Of Tautog (Tautoga Onitis) In The Lower Chesapeake Bay And Coastal Waters Of Virginia

The tautog, Thutoga onitis (Linnaeus), ranges from Nova Scotia to South Carolina and has become a popular target for recreational and commercial fisheries. Although tautog are a multiple spawning species, reproductive potential, measured as annual fecundity, has not been estimated previously with methods (batch fecundity, spawning frequency) necessary for a species with indeterminate annual fecundity. A total of 960 tautog were collected from the mouth of the Rappahannock River in the lower Chesapeake Bay to 45 kin offshore of Virginia\u27s coastline to investigate tautog reproductive biology in the southern portion of the species range. Tautog did not exhibit a 1:1 sex ratio; 56% were females. Male tautog reached 50% maturity at 218 mm TL, females at 224 mm TL. Tautog spawned from 7 April 1995 to 15 June 1995, at locations from the York River to 45 kin offshore. Batch fecundity estimates ranged from 2800 to 181,200 eggs per spawning for female tautog age 3-9, total length 259516 mm. Mean batch fecundity +/-SEM for female tautog ages 4-6 was 54,243 2472 eggs and 106,256 3837 eggs for females ages 7-9. Spawning frequency was estimated at 1.2 days, resulting in 58 spawning days per female in 1995. Estimates of potential annual fecundity for tautog ages 3-9 ranged from 160,000 to 10,510,000 eggs

Maximum likelihood estimation of photon number distribution from homodyne statistics

We present a method for reconstructing the photon number distribution from the homodyne statistics based on maximization of the likelihood function derived from the exact statistical description of a homodyne experiment. This method incorporates in a natural way the physical constraints on the reconstructed quantities, and the compensation for the nonunit detection efficiency.Comment: 3 pages REVTeX. Final version, to appear in Phys. Rev. A as a Brief Repor

Coral-like V<inf>2</inf>O<inf>5</inf> nanowhiskers as high-capacity cathode materials for lithium-ion batteries

Coral-like V2O5 nanowhiskers were prepared by a direct electrolytic synthesis method. The as-prepared V2O5 nanowhiskers are approximately 1 μm in length and 50-60 nm in width, which was confirmed by scanning electron microscopy and transmission electron microscopy analysis. When applied as cathode materials in lithium-ion batteries and combined with an ionic liquid electrolyte, the V2O5 nanowhiskers exhibited an initial capacity of 461 mAh g-1, which is a significant enhancement compared to commercial V2O5 powders. The high rate performance of the V2O5 nanowhiskers was further improved at an elevated working temperature of 50 °C. The V2O5 nanowhiskers demonstrated a high specific capacity and an excellent high-rate performance at elevated temperatures. © 2013 The Royal Society of Chemistry

Transport critical current density in Fe-sheathed nano-SiC doped MgB2 wires

The nano-SiC doped MgB2/Fe wires were fabricated using a powder-in-tube method and an in-situ reaction process. The depression of Tc with increasing SiC doping level remained rather small due to the counterbalanced effect of Si and C co-doping. The high level SiC co-doping allowed creation of the intra-grain defects and nano-inclusions, which act as effective pinning centers, resulting in a substantial enhancement in the Jc(H) performance. The transport Jc for all the wires is comparable to the magnetic Jc at higher fields despite the low density of the samples and percolative nature of current. The transport Ic for the 10wt% SiC doped MgB2/Fe reached 660A at 5K and 4.5T (Jc = 133,000A/cm2) and 540A at 20K and 2T (Jc = 108,000A/cm2). The transport Jc for the 10wt% SiC doped MgB2 wire is more than an order of magnitude higher than for the state-the-art Fe-sheathed MgB2 wire reported to date at 5K and 10T and 20K and 5T respectively. There is a plenty of room for further improvement in Jc as the density of the current samples is only 50%.Comment: 4 pages, 7 figures, presented at ASC 2002, Housto

Mesoporous hexagonal Co<inf>3</inf>O<inf>4</inf> for high performance lithium ion batteries

© 2014 Macmillan Publishers Limited. Mesoporous Co3O4 nanoplates were successfully prepared by the conversion of hexagonal β-Co(OH) 2 nanoplates. TEM, HRTEM and N2 sorption analysis confirmed the facet crystal structure and inner mesoporous architecture. When applied as anode materials for lithium storage in lithium ion batteries, mesoporous Co3O4 nanocrystals delivered a high specific capacity. At 10 C current rate, as-prepared mesoporous Co3O4 nanoplates delivered a specific capacity of 1203 mAh/g at first cycle and after 200 cycles it can still maintain a satisfied value (330 mAh/g). From ex-situ TEM, SAED and FESEM observation, it was found that mesoporous Co3O4 nanoplates were reduced to Li2O and Co during the discharge process and re-oxidised without losing the mesoporous structure during charge process. Even after 100 cycles, mesoporous Co3O4 crystals still preserved their pristine hexagonal shape and mesoporous nanostructure

Multi-mode density matrices of light via amplitude and phase control

A new method is described for determining the quantum state of correlated multimode radiation by interfering the modes and measuring the statistics of the superimposed fields in four-port balanced homodyne detection. The full information on the $N$-mode quantum state is obtained by controlling both the relative amplitudes and the phases of the modes, which simplifies the reconstruction of density matrices to only $N+1$ Fourier transforms. In particular, this method yields time-correlated multimode density matrices of optical pulses by superimposing the signal by a sequence of short local-oscillator pulses.Comment: 6 pages, late

Operational Theory of Homodyne Detection

We discuss a balanced homodyne detection scheme with imperfect detectors in the framework of the operational approach to quantum measurement. We show that a realistic homodyne measurement is described by a family of operational observables that depends on the experimental setup, rather than a single field quadrature operator. We find an explicit form of this family, which fully characterizes the experimental device and is independent of a specific state of the measured system. We also derive operational homodyne observables for the setup with a random phase, which has been recently applied in an ultrafast measurement of the photon statistics of a pulsed diode laser. The operational formulation directly gives the relation between the detected noise and the intrinsic quantum fluctuations of the measured field. We demonstrate this on two examples: the operational uncertainty relation for the field quadratures, and the homodyne detection of suppressed fluctuations in photon statistics.Comment: 7 pages, REVTe