Nondestructive testing of bond integrity in foam insulation/aluminum composites

Nondestructive test methods are used for evaluating bond integrity of low-density polyurethane spray-on foam used as cryogenic insulation on aluminum alloy surfaces

The Occupation of Jacksonville, 1864 And the Battle of Olustee, Letters of Lt. C. M. Duren

Charles M. Duren of Bangor, Maine, enlisted in 1861 in the 24th Massachusetts Regiment and saw much service, including the battles of New Bern, the noteworthy attack on Fort Wagner, and others in that area. He was promoted to 2nd. Lieutenant (1863) in the 54th Massachusetts Volunteer Infantry (a Negro regiment with white officers) and commanded Company D of that regiment in the battle of Olustee, the only major engagement of the War in Florida. This brought a promotion to 1st. Lieutenant. Some time later he was shot in the knee and thrown from his horse, breaking his leg. He was honorably discharged for disabilities in 1865. He never fully recovered and died in 1869 at the age of twenty-seven

On the number of solutions of a transcendental equation arising in the theory of gravitational lensing

The equation in the title describes the number of bright images of a point source under lensing by an elliptic object with isothermal density. We prove that this equation has at most 6 solutions. Any number of solutions from 1 to 6 can actually occur.Comment: 26 pages, 12 figure

Evaluation of ultrasonics and optimized radiography for 2219-T87 aluminum weldments

Ultrasonic studies are described which are specifically directed toward the quantitative measurement of randomly located defects previously found in aluminum welds with radiography or with dye penetrants. Experimental radiographic studies were also made to optimize techniques for welds of the thickness range to be used in fabricating the External Tank of the Space Shuttle. Conventional and innovative ultrasonic techniques were applied to the flaw size measurement problem. Advantages and disadvantages of each method are discussed. Flaw size data obtained ultrasonically were compared to radiographic data and to real flaw sizes determined by destructive measurements. Considerable success was achieved with pulse echo techniques and with 'pitch and catch' techniques. The radiographic work described demonstrates that careful selection of film exposure parameters for a particular application must be made to obtain optimized flaw detectability. Thus, film exposure techniques can be improved even though radiography is an old weld inspection method

Arkansas Cotton Variety Test 2002

The primary aim of the Arkansas Cotton Variety Test is to provide unbiased data regarding the agronomic performance of cotton varieties and advanced breeding lines in the major cotton-growing areas of Arkansas. This information helps seed dealers establish marketing strategies and assists producers in choosing varieties to plant. In this way, the annual test facilitates the inclusion of new, improved genetic material into Arkansas cotton production. Variety adaptation is determined by evaluation of the varieties and lines at four University of Arkansas research stations located near Keiser, Clarkedale, Marianna, and Rohwer. Tests are duplicated in irrigated and non-irrigated culture at the Keiser and Marianna locations. In 2002, 37 entries were evaluated in the main test and 25 were evaluated in the first-year test. This report also includes the Mississippi County Cotton Variety Test (a large-plot, on-farm evaluation of 12 Round-up Ready varieties) and 12 other on-farm cotton variety tests conducted by the University of Arkansas Cooperative Extension Service

Teaching in groups in grade III.

Thesis (Ed.M.)--Boston University N.B.:Pages 28, 144 and 145 are missing from original thesis

The Nation\u27s Two Measures of Homicide

The United States uses two national data collection systems to track detailed information on homicides: the Federal Bureau of Investigation’s Supplementary Homicide Reports and the Centers for Disease Control and Prevention’s Fatal Injury Reports. Both measures were developed as part of a federal effort to improve national statistical systems in the early twentieth century and have gone through a number of changes since then to improve their consistency and coverage. Each program provides valuable information on the nature, trends, and patterns of homicides in the United States. Although the two measures generally capture information on the same types of events, they are designed for distinct purposes and collect different types of information. In combination, however, they produce a fairly comprehensive understanding of homicide, the most serious form of violence

Injectivity of sections of convex harmonic mappings and convolution theorems

In the article the authors consider the class ${\mathcal H}_0$ of sense-preserving harmonic functions $f=h+\overline{g}$ defined in the unit disk $|z|<1$ and normalized so that $h(0)=0=h'(0)-1$ and $g(0)=0=g'(0)$, where $h$ and $g$ are analytic in the unit disk. In the first part of the article we present two classes $\mathcal{P}_H^0(\alpha)$ and $\mathcal{G}_H^0(\beta)$ of functions from ${\mathcal H}_0$ and show that if $f\in \mathcal{P}_H^0(\alpha)$ and $F\in\mathcal{G}_H^0(\beta)$, then the harmonic convolution is a univalent and close-to-convex harmonic function in the unit disk provided certain conditions for parameters $\alpha$ and $\beta$ are satisfied. In the second part we study the harmonic sections (partial sums) $$s_{n, n}(f)(z)=s_n(h)(z)+\overline{s_n(g)(z)},$$ where $f=h+\overline{g}\in {\mathcal H}_0$, $s_n(h)$ and $s_n(g)$ denote the $n$-th partial sums of $h$ and $g$, respectively. We prove, among others, that if $f=h+\overline{g}\in{\mathcal H}_0$ is a univalent harmonic convex mapping, then $s_{n, n}(f)$ is univalent and close-to-convex in the disk $|z|< 1/4$ for $n\geq 2$, and $s_{n, n}(f)$ is also convex in the disk $|z|< 1/4$ for $n\geq2$ and $n\neq 3$. Moreover, we show that the section $s_{3,3}(f)$ of $f\in {\mathcal C}_H^0$ is not convex in the disk $|z|<1/4$ but is shown to be convex in a smaller disk.Comment: 16 pages, 3 figures; To appear in Czechoslovak Mathematical Journa

Ontwikkeling van de HydroRig

De HydroRig is een alternatief vistuig voor de vangst van platvis ter vervanging van de wekkerstimulering in de boomkorvisserij. De noodzaak voor alternatieven komt voort uit ecosysteem kritiek op de boomkor met wekkers en de sterk oplopende brandstofkosten. In Nederland werden er al proeven gedaan aan een vistuig waarbij de boom is vervangen door een vleugel om de stroming op de bodem te beïnvloeden. Het idee van beïnvloeding van de stroming om vangst te verbeteren kwam oorspronkelijk uit de VS in een toepassing op een schelpdierkor. Door middel van bolkappen in het vistuig worden bodemdieren omhoog gedreven om beschikbaar te komen voor vangst. Dit rapport beschrijft de ontwikkeling vanaf 2008 in het VIP project HydroRig een geeft de stadia, van experimenten op zee met een aangepast vleugelprofiel, stromingsberekeningen en proeven in het laboratorium (water-grond goot) van DELTARES te Delft aan zgn. ‘bolkappen’, en toepassing hiervan op zee in verschillende configuraties met vangstmonitoring en onderwaterobservaties op de FD-281. Aan het eind van het project werden door middel van modelproeven in de ‘flume tank’ van IFREMER te Boulogne, Frankrijk nieuwe ontwerpen gemaakt voor een net met de onderpees dichter bij de boom. Gemiddeld werd bij vergelijking met het zusterschip FD-283, ook vissend op schol met een traditioneel boomkortuig en 100 mm maaswijdte, met de HydroRig (FD-281) ca. 21% brandstof bespaard, maar daartegenover stond een ca. 32% lagere besomming. Het vissen met de HydroRig in het commerciële bedrijf stagneert momenteel door de lage scholprijzen, die een belemmering vormen tot verder experimenteren. Toch wordt aanbevolen de proeven met bolkappen en nieuwe netontwerpen te vervolgen en te pogen de visnamigheid op schol te verbeteren, omdat de HydroRig veel minder benthos bijvangt