background preloader

Larmes de verre

Facebook Twitter

Ballad of Gresham College. In Praise of that choice Company of Witts and Philosophers who meet on Wednesdays weekly att Gresham Colledg. Our Merchants on th'Exchange doe plott T'increase the Kingdom's wealth by trade. Att Gresham Colledge a learned Knott Unparallel'd designes have laid To make themselves a Corporation And knowe all things by Demonstration.

Seaven was the number of the Sages; The eight wiseman wee call a Foole. Our Fame must then exceed all Ages Who have Seaventie wise men in one Schoole. Wee adore the, Gresham, for thy Colledge From whence must issue soe much Knowledg. This learned Septuagint consists Of men of Honor and of parts. There's L[or]ds, Kn[igh]ts, Physicians, Priests, All skill'd in Sciences and Arts,Solomons in nature and can read there Even from the Hysop to the Cedar. Thy Colledg, Gresham, shall hereafter Be the whole world's Universitie,Oxford and Cambridge are our laughter; Their learning is but Pedantry. But yett they'd have the Colledge endow'd With about a thousand pounds a year. Prochronique (Thwaite) Glimpses of the Wonderful: The Life of Philip Henry Gosse 1810-1888by Ann Thwaite387pp, Faber, £25 PH Gosse's tragedy - and that is not too strong a word - was that he arrived on the planet a couple of generations too late.

As an 18th-century country parson, or more probably a dissenting minister, pottering around his parish and devoting his leisure to the contents of the local rock pool, he would, you feel, have been perfectly happy. Born into the age of Lyell and Darwin, on the other hand, where the secrets of the rocks were no longer secret and man had not been created but only descended, he was made miserable by a world in which science and his own private beliefs moved ever further apart. The beliefs endured, but the dreadful implications of evolutionary theory hung over his later life like a shroud.

More than a century after his death, most of what remains of Gosse in the public mind makes him seem either sinister or absurd. Or, at least, he thought he did. Oscar and Lucinda (Carey) Plot introduction[edit] Inspiration[edit] Film[edit] External links[edit] Prince Rupert's Drop. Prince Rupert's Drops The very high residual stress within the drop gives rise to unusual qualities, such as the ability to withstand a blow from a hammer on the bulbous end without breaking, while the drop will disintegrate explosively if the tail end is even slightly damaged. Description[edit] While the head of the drop can be hit with a hammer without breaking, when any portion of the drop is damaged, even the smallest section of the tail, the large amount of potential energy stored in the internal structure is released, causing fractures to propagate through the glass toward the head at very high speeds which break the entire structure into flakes and powder.

[a] An examination of the shattering of Prince Rupert's Drops by the use of high speed video[2] has revealed that the "crack front" which is initiated at the tail end propagates in a disintegrating drop within the tensile zone towards the drop's head at a very high speed (1.45–1.9 km/s (0.9–1.2 mi/s)). History[edit] See also[edit] Étude des ruptures (Griffith) Fractography. Fractography is the study of fracture surfaces of materials.

Fractographic methods are routinely used to determine the cause of failure in engineering structures, especially in product failure and the practice of forensic engineering or failure analysis. In material science research, fractography is used to develop and evaluate theoretical models of crack growth behavior. Methods[edit] Crankshaft fatigue fracture An important aim of fractography is to establish and examine the origin of cracking, as examination at the origin may reveal the cause of crack initiation. Fractured breast implant catheter in SEM USB Microscopy[edit] USB microscopes are especially useful for examining fracture surface features since they are small enough to be hand-held. Fracture surface map[edit] Fracture map of failed breast implant A schematic fracture surface map is a valuable result of visual or microscopic examination.

Scanning electron microscopy[edit] Applications[edit] See also[edit] References[edit] Larmes bataviques. Fracture. A fracture is also the term used for a particular mask data preparation procedure within the realm of integrated circuit design that involves transposing complex polygons into simpler shapes such as trapezoids and rectangles. Fracture strength[edit] Fracture strength, also known as breaking strength, is the stress at which a specimen fails via fracture.[2] This is usually determined for a given specimen by a tensile test, which charts the stress-strain curve (see image). The final recorded point is the fracture strength.

Ductile materials have a fracture strength lower than the ultimate tensile strength (UTS), whereas in brittle materials the fracture strength is equivalent to the UTS.[2] If a ductile material reaches its ultimate tensile strength in a load-controlled situation,[Note 1] it will continue to deform, with no additional load application, until it ruptures. Types[edit] Brittle fracture[edit] Brittle fracture in glass The theoretical strength of a crystalline material is (roughly)