1-Identify three advantages of age hardening process in
aluminium alloys.
2- Chromium in stainless steel reacts with oxygen to form a
protective layer called chromium oxide; identify the
protective layer formed on aluminium to protect it from
corrosion. Explain how this protective layer on
aluminium behaves differently as compared to rust formed on
the surface of iron?
3-Explain the terms substitutional alloys and interstitial
alloys. Provide two examples for each type of alloys.
4- Explain the terms nucleation and grain...
Explain what the following Scheme code is doing:
(define (make-stream n f)
(define (next m)
(cons m (lambda () (next (f m)))))
(next n))
(define head car)
(define (tail stream)
((cdr stream)))
(define (nth stream n)
(if (= n 0) (head stream)
(nth (tail stream) (- n 1))))
(define even (make-stream 0 (lambda (n) (+ n 2))))
Try it out in Scheme48 and check the values of the following
expressions:
even
(head even)
(head (tail even))
(head (tail (tail even)))...