Psychology. 5th edition

A comprehensive, lively and engaging introduction to the fascinating study of the subject. The fifth edition of the best-selling Psychology is a contemporary text that will captivate all psychology students. The authors describe and explore every major area of psychology and present the latest findings, along with clear evaluation of controversial theories and models, to give a rigorous and critical grounding in the subject. Over 420 new references in this thoroughly updated fifth edition ‘Conceptual and historical issues in psychology’ highlight alternative perspectives and debates ‘Cutting edge’ introduces contemporary, exciting and important research ‘Psychology in Action’ applies the theories and principles to the world of psychology ‘Controversies in Psychological science’ explores current debates and issues within the field ‘International perspectives’ provides a cross-cultural review and presents topics in a global context. Vibrantly illustrated throughout with examples and photos from across the world, this is a must-read text for students of psychology, and will be an invaluable resource for those just beginning as well as those wishing to discover more. Psychology is available with access to MyPsychLab, which gives you an unrivalled suite of online resources

Monolithic Arrays of Grating-Surface-Emitting Diode Lasers and Quantum Well Modulators for Optical Communications

The electro-optic switching properties of injection-coupled coherent 2-D grating-surface-emitting laser arrays with multiple gain sections and quantum well active layers are discussed and demonstrated. Within such an array of injection-coupled grating-surface-emitting lasers, a single gain section can be operated as intra-cavity saturable loss element that can modulate the output of the entire array. Experimental results demonstrate efficient sub-nanosecond switching of high power grading-surface-emitting laser arrays by using only one gain section as an intra-cavity loss modulator

Controlling Internal Parasites of Sheep

Parasitism is the worst hazard in the raising of sheep. This is true in South Dakota and is generally true in other sheep-raising areas. No accurate figure of the cost of worm infestations can be given. The cost includes the loss in deaths, the lowered values of the unthrifty, light-weight lambs which survive, the added expense in feed and time in making such lambs salable, the cost of worm treatments and time in administering them. To these costs should be added the weight loss by sheep, resulting from moving them from range for treatments, and the handling of the flock incident to treatment. If figures were available, the total annual loss to sheep growers would certainly be many thousands of dollars in South Dakota alone. There has been a marked increase in numbers of sheep in the state in the past twenty-year period, from 682,000 in 1925 to a high of 2,300,000 in 1944. An increase in numbers on some farms and ranches without corresponding increase in acreage for pasture has no doubt contributed greatly to the seriousness of the parasite problem. There was a decline of 26 per cent in numbers of sheep in the two years preceding January 1, 1946.2 Difficulty experienced in controlling internal parasites is undoubtedly one of the factors responsible for the decrease. Some flocks were reduced in numbers and some were sold, entirely because of this difficulty. A study was undertaken in 1943 with the ultimate purpose of finding means of reducing the loss from parasites.3 The work has been confined largely to the range areas of the northwestern counties. It has included field observations of flock and range management methods, examination of sheep for evidence of parasitic infestations, and postmortem examinations for the various kinds of worms. During the 1945 grazing season an experimental flock was maintained under range conditions for study of the parasite problem

Leading-Log Effects in the Resonance Electroweak Form Factors

We study log corrections to inelastic scattering at high Bjorken x for Q^2 from 1 to 21 GeV^2. At issue is the presence of log corrections, which can be absent if high x scattering has damped gluon radiation. We find logarithmic correction of the scaling curve extrapolated to low Q^2 improves the duality between it and the resonance plus background data in the Delta region, indicating log corrections exist in the data. However, at W > 2 GeV and high x, the data shows a (1-x)^3 form. Log corrections in one situation but not in another can be reconciled by a W- or Q^2- dependent higher twist correction.Comment: 13 pages, report nos. RPI-94-N90 and WM-94-106, revtex, two figures (available by fax or post

On the Nucleon Distribution Amplitude: The Heterotic Solution

We present a new nucleon distribution amplitude which amalgamates features of the Chernyak-Ogloblin-Zhitnitsky model with those of the Gari-Stefanis model. This "heterotic" solution provides the possibility to have asymptotically a small ratio \hbox{$\vert G_{M}^{n}\vert/G_{M}^{p}\le 0.1$}, while fulfilling most of the sum-rule requirements up to the third order. Using this nucleon distribution amplitude we calculate the electromagnetic and weak nucleon form factors, the transition form factor $\gamma p \Delta^{+}$ and the decay widths of the charmonium levels $^3S_{1}$, $^3P_{1}$, and $^3P_{2}$ into $p\bar p$. The agreement with the available data is remarkable in all cases.Comment: 15 pages, RUB-TPII-21/92 Preprin

Spin Response and Neutrino Emissivity of Dense Neutron Matter

We study the spin response of cold dense neutron matter in the limit of zero momentum transfer, and show that the frequency dependence of the long-wavelength spin response is well constrained by sum-rules and the asymptotic behavior of the two-particle response at high frequency. The sum-rules are calculated using Auxiliary Field Diffusion Monte Carlo technique and the high frequency two-particle response is calculated for several nucleon-nucleon potentials. At nuclear saturation density, the sum-rules suggest that the strength of the spin response peaks at $\omega \simeq$ 40--60 MeV, decays rapidly for $\omega \geq$100 MeV, and has a sizable strength below 40 MeV. This strength at relatively low energy may lead to enhanced neutrino production rates in dense neutron-rich matter at temperatures of relevance to core-collapse supernova.Comment: 11 pages, 4 figures. Minor change. Published versio

Quantum Monte Carlo Calculations of A≤6A\leq6 Nuclei

The energies of $^{3}H$, $^{3}He$, and $^{4}He$ ground states, the ${\frac{3}{2}}^{-}$ and ${\frac{1}{2}}^{-}$ scattering states of $^{5}He$, the ground states of $^{6}He$, $^{6}Li$, and $^{6}Be$ and the $3^{+}$ and $0^{+}$ excited states of $^{6}Li$ have been accurately calculated with the Green's function Monte Carlo method using realistic models of two- and three-nucleon interactions. The splitting of the $A=3$ isospin $T=\frac{1}{2}$ and $A=6$ isospin $T=1$, $J^{\pi} = 0^{+}$ multiplets is also studied. The observed energies and radii are generally well reproduced, however, some definite differences between theory and experiment can be identified.Comment: 12 pages, 1 figur

Relativistic electrons from sparks in the laboratory

Discharge experiments were carried out at the Eindhoven University of Technology in 2013. The experimental setup was designed to search for electrons produced in meter-scale sparks using a 1 MV Marx generator. Negative voltage was applied to the high voltage (HV) electrode. Five thin (1 mm) plastic detectors (5 $\rm cm^2$ each) were distributed in various configurations close to the spark gap. Earlier studies have shown (for HV negative) that X-rays are produced when a cloud of streamers is developed 30-60 cm from the negative electrode. This indicates that the electrons producing the X-rays are also accelerated at this location, that could be in the strong electric field from counterstreamers of opposite polarity. Comparing our measurements with modeling results, we find that $\sim$300 keV electrons produced about 30-60 cm from the negative electrode are the most likely source of our measurements. A statistical analysis of expected detection of photon bursts by these fiber detectors indicates that only 20%-45% of the detected bursts could be from soft ($\sim$10 keV) photons, which further supports that the majority of detected bursts are produced by relativistic electrons

Scaling and Duality in Semi-exclusive Processes

We discuss extending scaling and duality studies to semi-exclusive processes. We show that semi-exclusive hard pion photoproduction should exhibit scaling behavior in kinematic regions where the photon and pion both interact directly with the same quark. We show that such kinematic regions exist. We also show that the constancy with changing momentum transfer of the resonance peak/scaling curve ratio, familiar for many resonances in deep inelastic scattering, is also expected in the semi-exclusive case.Comment: 8 pages, 4 figures, submitted to Phys.Rev.