Development of a 2.45-GHz Local Exposure System for In Vivo Study on Ocular Effects

We developed a new exposure system to irradiate microwaves locally on a rabbit eye using a small coaxial-to-waveguide adapter filled with low-loss dielectric material as an antenna. A numerical rabbit model was also developed using X-ray computer tomography images, and the specific absorption rates (SARs) in the rabbit, especially in the eye, were analyzed with the finite-difference time-domain method. The temperature elevation in the exposed eye was also evaluated by solving a bioheat equation. Our exposure system can generate incident power density of 15 mW/cm² at the surface of a rabbit eye with input power of 1 W. When the incident power density on the rabbit eye is 300 mW/cm² , average SAR over the exposed eye and the whole body were approximately 108 and 1.8 W/kg, respectively. The exposure system can realize localized exposure to the eye with the ratio of exposed-eye averaged SAR to the whole-body averaged SAR was 60. The developed exposure system can achieve high-intensity exposure such as the threshold of cataracts, i.e., the eye-averaged SAR over 100 W/kg or the lens temperature over 41 degC with the incident power density of 300mW/cm² without significant whole-body thermal stresses     

Bonding of Titanium Alloys

Surface pretreatments affect joint strength, some improve it, e.g. etching in aqueous hydrofluoric acid or oxidation in alkaline hydrogen peroxide; while others decrease the strength e.g. etching in acids containing high concentrations of oxidising agents.

For Ti-6A1-4V alloy, best results are obtained by either etching in aqueous hydrofluoric acid or oxidation in alkaline hydrogen peroxide for about two hours.

The results indicate that a pretreatment which leaves a coherent TiO₂-rutile layer, on a rough surface, form the strongest joints. Surface roughness is shown to enhance bond strength.     

Triple band planar inverted F antennas for handheld devices

Two novel triple band planar inverted F antennas (PIFAs) are presented. The first antenna is realised by housing a dual frequency L-shaped spur line loaded PIFA element within the lower resonance PIFA element. The second antenna is realised by embedding two single element PIFAs within a quarter-wave patch. For both antennas, an isolation of better than -15 dB between the feed ports and a good agreement between simulation and measurement results was obtained     

Mg-mediated Copolycondensation of α,α-Dibromotoluene with Bifunctional Electrophiles

Copolycondensation of α,α-dibromotoluene (1) with α,α‘-dibromo-p-xylylene (2) was found to proceed in the presence of excess Mg via nucleophilic substitution of in situ generated Grignard reagents to Br-bearing benzylic carbons. The use of dichlorodimethylsilane (3) and 1,6-dibromohexane (4) as a comonomer in the ternary copolycondensation with 1 and 2 was effective to give higher molecular weight polymers by improving their solubility. In the series of the copolycondensation, the copolymer with the highest M _n of 8480 was obtained in a 41% yield by the reaction of a feed ratio of [1]:[2]:[4] = 1:1:1 in THF at room temperature.     

"The Full Story by No Means All Told": Harry Stack Sullivan at Sheppard-Pratt, 1922-1930.

Harry Stack Sullivan (1892-1949) is well known for his interpersonal theory of mental illness, but little is known about how he actually worked as a clinician with patients. This article examines a pivotal time in Sullivan's career at Sheppard and Enoch Pratt Hospital in Baltimore from 1922 to 1930. Using clinical records as well as published writings, the article focuses on 2 crucial issues that are not fully addressed either in Sullivan's published writings or in past studies of him: first, his treatment as a gay psychiatrist of patients who he believed had homosexual orientations; second, the intellectual and institutional paradigm in psychiatry that influenced his practice. Finally, this article addresses the circumstances surrounding Sullivan's departure from Sheppard-Pratt, suggesting psychiatry's limited confrontation with the social stigmatization of homosexuality. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Surgery for unilateral coronal synostosis (plagiocephaly): unilateral or bilateral correction?

The treatment offered individuals of childhood sexual abuse is often unnecessarily long-term and is typically based upon the victimization/recovery model. This paper presents a brief case study illustrating the successful short-term cognitive-behavioral treatment of a 28-year-old woman with hypoactive sexual desire who reported a history of repeated sexual molestations throughout her childhood.     

Fire-retardant performance of some surface coatings for naval ship interior applications

The fire-retardant performances of various surface coatings for naval ship interior applications have been evaluated by a number of small-scale fire test methods. The coatings were eveluated as topcoats by cone calorimetry and limiting oxygen index methods and as primer/topcoat systems by radiat heating, direct flame impingement and reverse panel heating procedures. The coatings investigated were (1) a solvent-based epoxy polyester, (2) a solvent-based fireretardant alkyd,(3) a solvent-based chlorimated alkyd and (4) a water-based acrylic. In terms of the measured parameters, the chlorinated alkyd has superior fire properties while the epoxy polyserter, the fire-retardant alkyd and parameters, the chlorinated alkyd has superior fire properties while the epoxy polyester, the fire-retardant alkyd and the acrylic have significat disadvantages in relation to fire propagation. The relatively low amount of hydrogen chloride (～ 0.3%—mass per initial mass) evolved by the chlorinated alkyd during cone calorimetric combustion and its outstanding fire-retardant properties have resulted in it being considered acceptable for naval ship interior applications.