The antiproton depth-dose curve measured with alanine detectors

In this paper we report on the measurement of the antiproton depth-dose curve, with alanine detectors. The results are compared with simulations using the particle energy spectrum calculated by FLUKA, and using the track structure model of Hansen and Olsen for conversion of calculated dose into response. A good agreement is observed between the measured and calculated relative effectiveness although an underestimation of the measured values beyond the Bragg-peak remains unexplained. The model prediction of response of alanine towards heavy charged particles encourages future use of the alanine detectors for dosimetry of mixed radiation fields.     

现代硬盘故障分析与恢复

目前流行的硬盘储存器都具有非常完善而先进的内置式程序保障系统,它包括硬盘微处理器执行码和大量硬盘运行所需的各种各样的数据表。硬盘内置式程序总的容量大小可以达到几个Mbit。一旦硬盘的这种程序出现被损坏情况,那么,即使硬盘的整个机械装置和电子器件完好无损,硬盘还是会出现部分或完全的工作故障。     

Antiproton therapy

Radiotherapy is one of the most important means we have for the treatment of localised tumours. It is therefore essential to optimize the technique, and a lot of effort goes into this endeavour. Since the proposal by Wilson in 1946 [R.R. Wilson, Radiology use of fast protons, Radiology 47 (1946) 487.] that proton beams might be better than photon beams at inactivating cancer cells, hadron therapy has been developed in parallel with photon therapy and a substantial knowledge has been gained on the effects of pions, protons and heavy ions (mostly carbon ions). Here we discuss the recent measurements by the CERN ACE collaboration of the biological effects of antiprotons, and argue that these particles very likely are the optimal agents for radiotherapy.     

AIC、舒尔、森海塞尔,联合打假

2001年12月19日，舒尔和森海塞尔这两家在世界范围内独占鳌头的话筒生产厂商，联合工商管理局以针对赝品话筒的生产和销售，于12月12日，在江门和恩平工商局的工作人员搜捕中查获了一个造假者的生产窝点，并在例行检查中查获了另外其它4个恩平市境内的造假者。在当天的稽查中抄收了1000件赝品话筒成品和大批零配件，据估计使用这些零配件足以生产超过50,000件舒尔（SHURE）和森海塞尔(Sennbeiser)赝品话筒，这也是扩声器材领域查获的最大一宗案例。“我们邀请‘森海塞尔’加入到这一行动中来，组成针对赝品制造者的联合阵线，我想这也是…