An Efficient Code-Based Voxel-Traversing Algorithm

The paper considers an efficient approach to traversing a uniformly-subdivided space pierced by a line segment. A voxel, as the basic constituent element of the uniformly subdivided space, is restricted to having the form of a cube. The algorithm works in two steps. In the first step, the so-called Bresenham voxels are identified and, by comparing their position codes, their type of connectivity is determined. To achieve the required connectivity between neighbouring voxels, the second step of the algorithm is applied to find the missing voxels. In this way, the algorithm efficiently switches between face-, edge- and vertex-connectivity. Although the algorithm works with oating-point precision, it is extremely computationally efficient, and tests of speed compared with the Müller, Cleary & Wyvill, Amanatides & Woo, and Zemčik algorithms are described.     

Effect of irradiation and packaging type on sensory quality of chill-stored turkey breast fillets

A panel of experienced assessors was used to test the effect of irradiation at 2.5kGy (250krad) on the sensory quality of 1-day and 21-day-old turkey breast fillets stored at 1°C in either oxygen-permeable polythene or an oxygen-impermeable barrier film. In the application of Free Choice Profiling and Generalized Procrustes Analysis, assessors used their own terms to describe the appearance, odour and flavour of the samples.
The irradiated samples showed negligible growth of micro-organisms across 21 days of storage. Radiation treatment resulted in an intense pink colour in the raw and cooked samples, which was maintained during storage in oxygen-impermeable film, but decreased in samples exposed to oxygen during storage. Radiation also produced a set of unpleasant raw odour notes variously described as sour, rancid, mature, bad meat or putrid in the samples stored in oxygen-impermeable film. These notes were unlike the sulphurous notes previously associated with protein denaturation in irradiated chicken and were apparently distinct from the odour notes that developed in corresponding non-irradiated samples.     

管环缝射线一次透照长度及分段次数的计算

介绍了管环缝射线透照方式，以及环缝单壁外透法和环缝双壁单影法100％射线透照检查一次透照长度及分段次数的计算。     

初至波走时层析成像中的正则化方法

 波场的等效性、观测数据的有限性和观测误差等因素导致地球物理反演本身具有严重的多解性，降低这种多解性的一种重要途径就是对反演过程进行约束。传统的初至波走时层析成像方法，通常是在外部对模型空间施加显式的约束和平滑处理，这样就会破坏模型参数与传播算子之间的相关性，难以达到有效利用先验信息的目的, 甚至会影响反演的稳定性。针对这一问题，本文将先验信息分为三类，在此基础上阐述了通过正则化手段将各种先验信息纳入到反演方程当中，替代传统的外部约束模式。理论试验结果表明，正则化方法比外部约束方法有效地提高了反演的精度和分辨率；将该正则化方法应用于实际二维资料处理，也得到了比较好的反演结果。     

硫对注入YSZ单晶的金属铂在退火过程中结晶的影响

秀卢瑟福背散射－沟道技术（ＲＢＳ－Ｃ）和Ｘ射线衍射技术（ＸＲＤ）研究了Ｐｔ和注入ＹＳＺ（Ｙ２Ｏ３稳定的ＺｒＯ２）后产生的损伤和退火过程中损伤的恢复及注入Ｐｔ的晶化，ＲＢＳ－Ｃ分析表明ＹＳＺ室温下的存在较强自退火效应，ＸＲＤ分析结果示出硫以铂的晶化产生很大影响。     

强脉冲辐射场非平衡硬X辐射测量技术

本文介绍了强脉冲辐射场非平衡硬Ｘ辐射谱测量方法。文中对测量原理、关键定标技术进行了叙述。     

Radiation effects on insulators for superconducting fusion magnets

Fibre-reinforced plastics (FRPs) are candidate materials for the insulation of superconducting magnet coils in future fusion reactors. This paper reports on a test programme performed to assess the mechanical properties of these materials and to obtain information on the damage and fracture mechanisms. Different types of FRPs (epoxies and poly- and bismaleimides as resins; two- and three-dimensional E-, S- or T-glass fabrics as reinforcements) were irradiated at room temperature by 2 MeV electrons and ⁶⁰Co-gamma rays up to 1.8 × 10⁸ Gy and by different reactor spectra up to a neutron fluence of 1 × 10²³ m⁻² (E > 0.1 MeV) at room temperature, 80 K or 5 K. Mechanical tests in tension as well as in the intralaminar crack opening and shear mode were carried out on the irradiated samples at 77 K. After low temperature irradiation, half of the samples were subjected to a warm-up cycle to room temperature before testing at 77 K. Results on the influence of different radiation sources and annealing cycles on the mechanical properties of these materials will be discussed.     

The Method of Dynamic Palette Construction in Realistic Visualization Systems

The paper describes the colour approximation problem and the method of dynamic palette construction is suggested for its solution. The method uses the graphic display palette based on the computed true colour of the individual picture. Some aspects of human colour perception are considered. Two metrics in colour space are introduced to estimate closeness of the suggested colour approximation. The method was applied to visualize 3D scenes generated by ray tracing.     

微波辐射对细胞膜通透性的影响

本实验通过电镜镧细胞化学方法，观察了微波辐射对生物样品细胞膜通透性的影响。在常规化学固定的情况下，镧颗粒沿细胞间隙密集分布而不能进入细胞内。生物样品经微波辐射后，在细胞内甚至在线粒体等细胞器内可观察到较多的镧颗粒。提示：微波辐射使生物膜的通透性发生了改变。     

轻/重水堆中子辐照氢区熔硅退火特性的比较

用电阻率测量、金相观察以及红外光谱等方法分别研究了氢区熔硅单晶在轻水反应堆和重水反应堆进行中子辐照后的退火特性。电阻率退火曲线表明，两种中子辐照样品都存在氢致施主。随着退火温度由低到高，轻水堆辐照样品存在一个导电类型由ｐ型到ｎ型的转型过程，而且在这种转型过程中，有一个明显的“周边滞后”现象。在重水堆辐照样品中，热处理缺陷表现为氢致Φ型缺陷（大麻坑），而在轻水堆辐照样品中，热处理缺陷表现为尺寸小得多的氢沉淀。红外光谱测量结果表明，重水堆中子辐照的样品经短时退火后观察不到氧沉淀，而在轻水堆辐照样品中存在吸收峰在１２３０ｃｍ－１附近的氧沉淀。