Air-breathing engines

Article Abstract:

Jet planes which use oxygen from the atmosphere to attain speeds beyond Mach 5 are lighter than the conventional rockets because they no need to carry an oxidizer. Ramjets have air inlets which compress air when the vehicle is moving. Supersonic-combustion ramjets allow speeds beyond Mach 6.

Innovations, Engines, Jet airplanes, Jet planes, Jet propulsion

---

Supreme emergencies revisited

Article Abstract:

A discussion on admitting the gap between the moral constraints which apply to ordinary warfare and those applied to supreme emergencies is presented. It is suggested that none of the arguments for special permissions can withstand criticism.

Analysis, Self-defense, Self defense (Personal safety), Utilitarianism, Attack and defense (Military science), Attack and defence (Military science), Self defence

---

Prized rubble of emperors and sultans

Article Abstract:

Issues concerning projects of saving and preserving the ruins of the Roman city of Volubilis in Morocco are discussed. Particular attention is given to the archaeological and historical importance of the site and to efforts made to save it.

Discovery and exploration, Rome (Ancient state), Historic sites, Morocco, Volubilis, Morocco

Similar abstracts:

• Abstracts: Rivetting ideas. Sound advice from Europe: engine noise - problems and solutions
• Abstracts: That zincing feeling. Variegation
• Abstracts: Watching under Boston. How to Buy a PBX
• Abstracts: Searching for a partner. Creature comforts in the office
• Abstracts: Rehabbing the rails. Maastricht's problematical future

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.