Why are married men working so much?

Empirical patterns of labor supply at the micro level tend to reject the unitary model assumption implicit in most macro theories, where households are the deemed to be rational agents. This paper examines the rise in in per-capita labor since 1975 and asks how the inclusion of bargaining between spouses in a standard macro model would alter the analysis of recent trends in aggregate labor supply. The main findings are that the stationarity of married men's work hours reflects weakening of men's bargaining position as women's wages rose, and that the unitary model seriously overstates the response of aggregate labor to trends in relative wages

Nurses\u27 Alumnae Association Bulletin - Volume 3 Number 5

Jefferson Marches On Christmas Packages The United States Cadet Nurse Corps and Jefferson Medical College Hospital Attention Promotions Welcome, Miss Hopkins Student Nurse Activities Scholarship Girls Taking Anaesthesia Our Office and Teaching Staff Message from the President News Bulletins Information Please! Coming Events Graduate Nurses\u27 Chorus Condolences Emergency Nursing Penicillin Organized Staff - 1943-1944 New Positions New Alumnae News of Our Doctors Doctors in Army Army Nurse Corps Navy Nurse Corps Engagements Marriages New Arrival

Spectrophotovoltaic orbital power generation

A subscale model of a photovoltaic power system employing spectral splitting and 1000:1 concentration was fabricated and tested. The 10-in. aperture model demonstrated 15.5% efficiency with 86% of the energy produced by a GaAs solar cell and 14% of the energy produced by an Si cell. The calculated efficiency of the system using the same solar cells, but having perfect optics, would be approximately 20%. The model design, component measurements, test results, and mathematical model are presented

Statistical modelling for prediction of axis-switching in rectangular jets

Rectangular nozzles are increasingly used for modern military aircraft propulsion installations, including the roll nozzles on the F-35B vertical/short take-off and landing strike fighter. A peculiar phenomenon known as axis-switching is generally observed in such non-axisymmetric nozzle flows during which the jet spreads faster along the minor axis compared to the major axis. This might affect the under-wing stores and aircraft structure. A computational fluid dynamics study was performed to understand the effects of changing the upstream nozzle geometry on a rectangular free jet. A method is proposed, involving the formulation of an equation based upon a statistical model for a rectangular nozzle with an exit aspect ratio (ARe) of 4; the variables under consideration (for a constant nozzle pressure ratio (NPR)) being inlet aspect ratio (ARi) and length of the contraction section. The jet development was characterised using two parameters: location of the cross-over point (Xc) and the difference in the jet half-velocity widths along the major and minor axes (ΔB30). Based on the observed results, two statistical models were formulated for the prediction of axis-switching; the first model gives the location of the cross-over point, while the second model indicates the occurrence of axis-switching for the given configuration

Petiolate wings: effects on the leading-edge vortex in flapping flight

The wings of many insect species including crane flies and damselflies are petiolate (on stalks), with the wing planform beginning some distance away from the wing hinge, rather than at the hinge. The aerodynamic impact of flapping petiolate wings is relatively unknown, particularly on the formation of the lift-augmenting leading-edge vortex (LEV): a key flow structure exploited by many insects, birds and bats to enhance their lift coefficient. We investigated the aerodynamic implications of petiolation P using particle image velocimetry flow field measurements on an array of rectangular wings of aspect ratio 3 and petiolation values of P = 1–3. The wings were driven using a mechanical device, the ‘Flapperatus’, to produce highly repeatable insect-like kinematics. The wings maintained a constant Reynolds number of 1400 and dimensionless stroke amplitude Λ* (number of chords traversed by the wingtip) of 6.5 across all test cases. Our results showed that for more petiolate wings the LEV is generally larger, stronger in circulation, and covers a greater area of the wing surface, particularly at the mid-span and inboard locations early in the wing stroke cycle. In each case, the LEV was initially arch-like in form with its outboard end terminating in a focus-sink on the wing surface, before transitioning to become continuous with the tip vortex thereafter. In the second half of the wing stroke, more petiolate wings exhibit a more detached LEV, with detachment initiating at approximately 70% and 50% span for P = 1 and 3, respectively. As a consequence, lift coefficients based on the LEV are higher in the first half of the wing stroke for petiolate wings, but more comparable in the second half. Time-averaged LEV lift coefficients show a general rise with petiolation over the range tested.This work was supported by an EPSRC Career Acceleration Fellowship to R.J.B. (EP/H004025/1)

The effect of aspect ratio on the leading-edge vortex over an insect-like flapping wing

Insect wing shapes are diverse and a renowned source of inspiration for the new generation of autonomous flapping vehicles, yet the aerodynamic consequences of varying geometry is not well understood. One of the most defining and aerodynamically significant measures of wing shape is the aspect ratio, defined as the ratio of wing length (R) to mean wing chord ($\bar{c}$). We investigated the impact of aspect ratio, AR, on the induced flow field around a flapping wing using a robotic device. Rigid rectangular wings ranging from AR = 1.5 to 7.5 were flapped with insect-like kinematics in air with a constant Reynolds number (Re) of 1400, and a dimensionless stroke amplitude of $6.5\bar{c}$ (number of chords traversed by the wingtip). Pseudo-volumetric, ensemble-averaged, flow fields around the wings were captured using particle image velocimetry at 11 instances throughout simulated downstrokes. Results confirmed the presence of a high-lift, separated flow field with a leading-edge vortex (LEV), and revealed that the conical, primary LEV grows in size and strength with increasing AR. In each case, the LEV had an arch-shaped axis with its outboard end originating from a focus-sink singularity on the wing surface near the tip. LEV detachment was observed for $\mathrm{AR}\gt 1.5$ around mid-stroke at $\sim 70\%$ span, and initiated sooner over higher aspect ratio wings. At $\mathrm{AR}\gt 3$ the larger, stronger vortex persisted under the wing surface well into the next half-stroke leading to a reduction in lift. Circulatory lift attributable to the LEV increased with AR up to AR = 6. Higher aspect ratios generated proportionally less lift distally because of LEV breakdown, and also less lift closer to the wing root due to the previous LEV's continuing presence under the wing. In nature, insect wings go no higher than $\mathrm{AR}\sim 5,$ likely in part due to architectural and physiological constraints but also because of the reducing aerodynamic benefits of high AR wings

Evaluation of NHS Direct ‘‘referral’’ to community pharmacists

OBJECTIVES: To evaluate a pilot scheme of referrals from a nurse-led telephone helpline (NHS Direct) to community pharmacists. METHODS: A multi-method approach, including analysis of routine data from NHS Direct, postal surveys of NHS Direct callers, analysis of anonymised transcripts of calls, a postal survey of callers referred to pharmacists, and face-to-face interviews with NHS Direct nurses. SETTING: Essex, Barking and Havering. KEY FINDINGS: During the first three months of the pilot scheme, 6% (1,995/31,674) of NHS Direct calls triaged by nurses were logged as referred to pharmacists. This built on an existing foundation of informal referral to pharmacists of 4%. There was no measurable change in callers’ views of the helpfulness of advice, enablement, or caller satisfaction associated with the scheme. Conditions sent to pharmacists included skin rash, cough, sore throat, stomach pain, and vomiting and/or diarrhoea. 86% (54/63) of callers referred to pharmacists during the scheme felt the referral was very or quite appropriate and 75% (48/64) attempted to contact a pharmacist. In general, those who did so found the experience a positive one: 65% (31/48) spoke to the pharmacist, and 80% (28/35) of people expressing an opinion were satisfied with the advice offered, but the lack of privacy in the pharmacy was of some concern. Although routine data indicated high usage of the scheme, nurse referral of callers to pharmacists declined over time. Their initial enthusiasm diminished due to concerns about the appropriateness of guidelines, their lack of understanding of the rationale behind some referrals, and the lack of feedback about the appropriateness of their referrals. CONCLUSIONS: The evaluation of the pilot scheme has generated a range of recommendations for the wider national roll-out of the scheme, including revision of the guidelines and review of NHS Direct nurse training for referral to pharmacy. NHS Direct and pharmacists should consider how to strengthen the system of pharmacist feedback to NHS Direct

CAPITAL FOR THE AGRICULTURE OF THE FUTURE

Agricultural Finance,

Large-scale instabilities in a STOVL upwash fountain

The fountain flow created by two underexpanded axisymmetric, turbulent jets impinging on a ground plane was studied through the use of laser-based experimental techniques. Velocity and turbulence data were acquired in the jet and fountain flow regions using laser doppler velocimetry and particle image velocimetry. Profiles of mean and rms velocities along the jet centreline are presented for nozzle pressure ratios of two, three and four. The unsteady nature of the fountain flow was examined and the presence of large-scale coherent structures identified. A spectral analysis of the fountain flow data was performed using the Welch method. The results have relevance to ongoing studies of the fountain flow using large eddy simulation techniques