Question

1. schematic description of the conversion of a glass into a glass-ceramic. the critical cooling rate is qc = (tl – tn) / δt with tl = liquidus temperature, and tn = “nose temperature” (=temperature at which the time δt to achieve a crystal fraction of 10â’6 is shortest, according to eq. (1)). glass formation by melt-quenching takes place for q ≥ qc. “uncontrolled” spontaneous crystallization occurs for q < qc. the glass-ceramic a is obtained during cooling, whereas glass-ceramics b and c are converted by single and double-stage heat-treatments, respectively.

Answer 1

Highways and Infrastructure Development Corporation (NHIDCL) and Public Works Department (PWD) of the state governments. NHAI was established by National Highways Authority of India Act, 1988. Section 16(1) of the Act states that the function of NHAI is to develop, maintain and manage the national highways and any other highways vested in, or entrusted to, it by the Government of