Planetary Systems: Detection,Formation and Habitability of Extrasolar Planets,by M. Ollivier,T. Encrenaz,F. Roques,F. Selsis and F. Casoli

Radioactive substances may be present in air as dust, fume or vapour. very often attached to the natural aerosol. Many nuclides are produced in the upper atmosphere by the interaction of cosmic rays and atmospheric gases, and as a result of nuclear bomb tests. Radio-iodine has also been released accidentally from nuclear reactors.

Radioactive vapours and aerosols have been used to study mass-transfer between airstreams and surfaces.

The results are applicable to problems such as the travel and deposition of spores and pollen.     

日影、星光、船桅、地球及其他

史料表明,好几个文明古国的科学家各自独立地发明了"圭表"和"日晷"."圭"是直立在地上的标杆,"表"是专门配在"圭"旁,用来测量"圭"的日影长短的尺,合称"圭表".人们把连续两次杆影最长或最短的时间间隔叫做一年.用"圭表"可以把一年分为四季."日晷"则是指向特殊角度并配有时间标度圆盘的金属棒."晷"的原意就是日影.日晷能准确指示一天的各时刻.由此可见,日影是人类早期天文学研究的最好工具.誉满中外,名登月球的中国古代大科学家祖冲之这样描绘自己的一生:"亲量圭尺、躬察仪漏、目尽毫厘、心穷筹策."祖冲之何以如此钟爱日影呢?在他眼里,日影是太阳的使者,日影里寄寓着大自然的奥秘,尽管日影的测量劳神费力,但他却经年累月,乐此不疲.     

An Introduction to the Physics of Particle Accelerators,by Mario Conte and William W. MacKay

Hydrodynamic and Hydromagnetic Stability. By S. Chandrasekhar. (Clarendon Press :Oxford University Press, 1961.) [Pp. xx + 652.] 105s.

Twenty-five Years of B.B.C. Television. By Sir Harold Bishop. [B.B.C. Engineering Division Monographs No. 39.1 (B.B.C., 1961.) [Pp. 41.1 5s.

Boundary and Eigeneralue Problems in Mathematical Physics. By Hans Sagan. Oyiley &; Sons, 1961.) [Pp. xviii + 3811. 76s.

Quantum Mechanics. By E. Merzbacher. (J. Wiley &; Sons, 1961.) [Pp. xii+544.] 96s.

(1) Careers in High School Physics Teaching. (2) Careers in College Physics Teaching. Published by the American Institute of Physics, under a grant from the National Science Foundation, April and May 1962. [Pp. 20 and 24.]     

An Introduction to Quark—Gluon Plasmas

It is tried to present the main features of quark-gluon plasma physics to a possible reader not so familiar with quantum chromodynamics and its extension to high temperatures, merely by looking for some analogies to usual electrodynamic plasma phenomena: The electrons correspond to the quarks, the photons to the gluons, the electromagnetic coupling to the strong coupling. However, in contrast to the ionization processes or, more general, generation processes of electrically charged particles or holes, the change from the usual hadronized state of nuclear matter to the collective quark-gluon plasma state is a first-order phase transition. The possible existence of such quark matter in the cores of massive neutron stars, at ultrarelativistic heavy-ion collisions and in the early state of the Universe are discussed in a verbal approximation.