The role of repair in radiobiology

Summary Apart from cancer and mutation induction, radiobiological effects on mammals are mostly attributable to cell death, defined as loss of proliferative capacity. Survival curves relate retention of that capacity to radiation dose, and often manifest a quasi-threshold (shoulder). The shoulder is attributable to an initial mechanism of repair (Q-repair) which is gradually depleted as dose increases. Another form of repair, which is not depleted (P-repair), increases the dose required to deliver an average of one lethal event per cell (dose D₀). Neither form of repair can unambiguously be linked with repair of defects in isolated DNA. An important initial lesion may well be disruption of the complex structural relationship between the DNA, nuclear membrane and associated proteins. One form of P-repair may be restoration of that structural relationship.     

西昌人工与自动酸雨观测记录差异规律研究

利用西昌国家基本气象站2021年人工和自动的酸雨观测数据,对TCYII 1型酸雨自动观测系统和人工系统的降水采样偏差及完整性、测量数据的准确性和一致性、设备硬件及软件通讯的故障率进行了对比分析。结果表明：正常情况下,2套系统数据的完整性、准确性、一致性较好。酸雨自动观测系统在采样方式及样品保存方面具备一定优势,能够保证观测数据更接近于自然雨水的数值,更贴近真实情况。自动观测系统面临单轨运行,它的手动操作设置、部分配件需厂家优化改进。上级主管部门对自动系统测量阈值的设定、采样中出现的漏采、空采、多采等特殊情况,仍需进一步明确处理办法。     

关于纺织机械噪声评价标准的探讨

机器噪声的污染问题,日益受到世界各国的重视和关注,现在国际上对机器噪声的测量,主要采用声功率级。但用这种声功率级的评价指标尚有某些不足之处,本文拟在声功率级基础上,提出“机器噪声相对声功率系数”的概念,作为评价、比较、改进机器噪声及综合质量的补充指标,以弥补声功率级的不足。     

贵州省粮食储藏地理区划初步研究

通过对贵州省气象特征的分析,尤其是对影响粮食安全储藏的主要环境因素温度和相对湿度的分析,得出贵州省粮食储藏可划分为四个地理区域。依据各区域的储藏气候条件和主要粮食的储藏特点,提出相应的储藏技术措施。     

吉非罗齐胶囊剂的相对生物利用度及其生物等效性评价

１０名健康受试者口服两种不同厂家生产的吉非罗齐胶囊,以高效液相色谱法（ＨＰＬＣ）测定其血药浓度经时过程,经“ＰＫＢＰ－Ｎ１”药动学程序计算表明,湘江制药厂生产的吉非罗齐胶囊与金晓制药厂生产的吉非罗齐胶囊的吸收半衰期ｔ１／２ｋａ分别为（０４２±０１９）和（０４９±０２８）ｈ;消除半衰期ｔ１／２分别为（１４８±０８４）和（１２６±０４５）ｈ;达峰时间ｔｍａｘ分别为（１４５±０３７）和（１６０±０７８）ｈ;达峰浓度ｃｍａｘ分别为（６１８８±１５５１）和（６１５１±１０３４）μｇ／ｍＬ;ＡＵＣ０－∞分别为（２１２９１±４７１６）和（１９９８５±２４９１）μｇ·ｈ／ｍＬ,以湘江制药厂生产的吉非罗齐胶囊为参比测得金晓制药厂生产的吉非罗齐胶囊的相对生物利用度为０９３９。经双单侧ｔ检验法统计分析,表明两制剂间ＡＵＣ无显著差异,两制剂具有生物等效性。     

On analytical treatment of all boundary and volume integrals in BEM

In this paper, the integrals appeared in BEM model for Poisson equation are all implemented analytically. Wherein, the boundary and the domain are discretized by linear boundary elements and linear internal triangle cells respectively. The closed formulations for all integrals are presented so that the computer effort for numerical solution is reduced considerably with higher accuray. The numerical example shows that the results are more accurate in comparision with Gaussian integration in the same discrezition. The basic idea of this paper could be extended to BEM model for Helmholtz equation and/or the time-dependent second other differential equations. Supported by the National Natural Science Foundation of China Tang Shaowu: born in 1971, Ph. D.     

一个模糊多目标群体决策方法

将多目标系统模糊决策理论推广到多目标标群体决策,给出一个模糊多目标群体决策方法。     

关于傅科摆相对运动轨迹的讨论

根据傅科摆确定的起始条件,正确导出其轨迹方程,并用计算机画出其相对运动轨迹曲线。同时推证得摆锤在最大幅角位置时,其相对速度为零这一重要特征。     

关于Scott拓扑的core紧性

ＤＣＰＯ Ｌ被称作Σ－ｃｏｒｅ紧的,如果当Ｌ赋以Ｓｃｏｔｔ拓扑后是一个ｃｏｒｅ紧空间,长期以来,从序结构的角度刻划那些Σ－ｃｏｒｅ紧的ＤＣＰＯ一直是悬而未解的问题。在一定的限制条件下讨论上述问题,并得到了一些结果。