Measurements of Total Reaction Cross Section for Light Nuclei and Evidence for the Anomalous Nuclear Structure in ^(15)C

Measurements of the total reaction cross section for^(12-16)C,^(14-17)N and^(16-18)O on carbon target at intermediate energies were performed on RIBLL of HIRFL.A larger enhancement ofσR for^(15)C was observed than that for its neighbors.The analysis of these data indicates possible existence of an anomalous nuclear structure in^(15)C.A new quantity was suggested as the criterion to distinguish anomalous structure nuclei from normal nuclei.

基于Brovey算法的机械高光谱图像数据自动化融合技术

针对机械设备高光谱图像自动融合过程中对于多光谱波段的光波分辨率较差,导致融合数据图像较为模糊的问题,提出基于Brovey算法的机械高光谱图像数据自动化融合技术。通过数据波段分析获取机械设备高光谱图像数据,根据滤波长度排列实现数据收集收集及过滤;以得到的有效数据为基础,通过融合规则及图像波长中心点将数据数据重新组合,记录符合组合标准的数据。利用融合准则结合Brovey算法完成图像数据的融合,保留符合系统相似度标准的数据,实现数据精准自动化融合。实验结果表明,所提技术能够准确融合机械高光谱图像数据,实现机械高光谱图像的高清融合。

基于条件随机场模型的制造企业实体识别方法研究

为解决制造企业抗风险能力较弱的问题,提出基于条件随机场模型的制造企业实体识别方法。建立必要的企业用户一元势函数,按照随机函数条件的划分标注,对条件随机场的标记节点进行推断,完成基于条件随机场模型的制造企业用户定义。在此基础上,区分制造企业实体界定条件、实体特征与实体成长模式,联合既定系数指标参量,实现制造企业实体识别方法的顺利应用。在同一企业环境中,随着实体识别方法的应用,企业各部门的抗风险能力开始明显提升,可从根本上实现对社会经济发展的有效性促进。

Isospin Effect of Fragmentation Reaction on the Isotopic Distribution Producedin Intermediate Energy Heavy Ion Collisions

Fragments produced in the reaction of 60 MeV/n^(18)O on Be have been measured experimentally.The isotopic distribution of fragmentation reaction is well reproduced by a modified statistical abrasion-ablation model It is predicted that the isotopic distribution shifts toward the neutron rich side for neutron rich projectile,but this isospin effect decreases with the increase of the atomic number difference Z-Z_(A)and disappears at last,where Z and Z_(A)are atomic numbers of the isotopic distribution and the projectile respectively.

Study on Excitation Function and Isospin Dependencies of Total Reaction Cross Section via the Boltzmann-Uehling-Uhlenbeck Model

The excitation function and isospin dependencies ofσR have been investigated by using the Boltzmann-Uehling-Uhlenbeck(BUU)model with a square-type density distribution.When the width parameter of the square distribution is obtained by fittingσR at relativistic energies,the BUU-model can reproduce the experimental data at intermediate energies better than Glauber model.The systematical underestimation ofσR at intermediate energy by Glauber model was removed out now by BUU calculation framework.It is also found thatσR is sensitive to nuclear equation of state andσin-NN medium.The difference factor d defined in text is sensitive to the nuclear structure such as neutron halo and neutron skin,etc.

Isospin Effects of Critical Behavior in Lattice Gas Model

Isospin effects of the critical phenomena were studied via Xe isotopes in the frame of the lattice gas model.All the critical temperatures for four Xe isotopes are close to 5.5 MeV at the same freeze-out density of about 0.39ρ0.The critical values of power law parameter of mass distribution,mean multiplicity of intermediate mass fragments,information entropy and Campi's second moment show minor dependence on the isospin at the critical point.

复杂网络视角下国际多中心临床试验机构合作趋势探究

目的:挖掘国际多中心临床试验国际合作趋势与特征,在新药研发国际化背景下,为监管部门推动国内多中心临床试验发展提供启示与借鉴。方法:基于美国临床试验注册中心(ClinicalTrials.gov)网站的数据,采集并分析2000—2020年国际多中心临床试验数据,运用复杂网络方法进行数据分析与特征挖掘。结果:自2000—2020年,国际多中心临床试验机构的合作网络规模不断扩大,合作紧密度不断增强,机构合作网络具有无标度特性。结论:国际多中心临床试验合作网络的规模呈扩大趋势,未来国际多中心临床试验机构间合作应该向着加强国际机构间合作紧密度的方向迈进。

抗肿瘤药物临床试验主要终点的规律研究

目的 随着新型抗肿瘤药物在临床试验中的广泛研究,作为临床试验设计的主要终点研究尤其重要。本文根据最新的抗肿瘤药物终点指南推荐的终点指标,探索它们的设计规律,为临床试验注册的参与者、决策者提供指导。方法本文根据临床试验注册的登记结构,使用网络爬虫技术对Clinical Trials. gov上注册试验数据进行采集,将数据清洗后做数据分析。结论 在抗肿瘤药物的临床试验中,常用终点是无进展生存期、总生存期、客观缓解率及完全缓解率。试验主要集中于Ⅱ期和Ⅲ期,各终点在Ⅱ期及Ⅲ期的样本量规律不同。试验主要终点的选择与试验研究对象和试验治疗方案存在关系。研究的终点常作为消化类肿瘤、造血器官类肿瘤、呼吸道类肿瘤及乳腺恶性肿瘤的主要终点。