两种特殊冠图的相关分数色数研究

图的着色问题是图论中的一个重要研究课题之一,分数色数作为正常色数的一个推广在计算机的许多领域中有着重要的应用．研究了一些特殊图形的分数色数,给出了计算这些图形分数色数的公式,并且对公式进行了证明．     

一类具有非线性发生率的时滞SIR模型的稳定性分析

传染病是现实世界中普遍存在的重要现象之一.考虑了一类具有时滞和非线性发生率的SIR模型.通过对特征根的分布进行分析,讨论了平衡点的稳定性,给出系统稳定和不稳定的充要条件.     

适应西藏高原环境的沥青抗紫外线老化试验研究

紫外线是导致西藏高原沥青路面早期损害的主要原因之一．根据实测的紫外线辐射水平,进行了不同掺量的3种纳米级抗紫外线老化剂（TiO2,CeO2和炭黑）的SBR沥青紫外线老化试验．针对老化后的沥青,进行了常规指标（TFOT后的针入度比、软化点）和SHRP指标的评价．针对已老化不同时间（500,1000和1500h）的、掺加0．8％炭黑的沥青,分别进行了红外光谱分析．采用灰色关联分析法,确定了抗紫外线老化剂的最佳掺量．结果表明,TiO2和CeO2不仅是好的紫外线吸收或屏蔽剂,而且是一种强氧化剂;炭黑是良好的抗紫外线老化剂,其最佳掺量为沥青质量的0．8％;沥青紫外线老化主要发生在老化前期,老化时间越长老化越严重．     

掠射法测液体折射率时折射角与介质折射率的关系

讨论了掠射法测液体折射率时折射角与介质折射率的关系，给出了统一的表达式，并通过实验予以验证．     

云南特有少数民族青少年近视和龋齿的动态分析

运用文献资料法、测试法、数理统计法等,对2005年与2010年5 a 间云南省特有少数民族青少年患近视率和龋齿率的情况进行动态对比分析,结果表明,云南特有少数民族青少年患近视检出率除佤族、哈尼族男生和女生外均出现上升趋势,男生上升幅度依次为纳西族＞傣族＞哈尼族＞佤族,女生上升幅度依次为纳西族＞傣族＞佤族＞哈尼族。患近视的检出率低于全国平均水平,但近视低龄化趋势日渐明显。而患龋齿检出率除傣族上升外,其他民族随着年龄的增长则随之减少。     

集美大学体育学院举重普修课学生运动损伤调查分析

通过采用问卷调查等多种方法,对集美大学体育学院体育教育2002-2006年级8个班举重普修课的学生共240人的运动损伤进行调查.调查结果:所调查的240名学生,有68人有运动损伤史,运动损伤率为28.33%.挺举项目损伤多发部位是腰部、肘关节、肩关节和膝关节(约占52.94%);抓举项目损伤多发部位是腰部、肩关节、肘关节和腕关节(约占47.06%);其损伤的主要原因有意外事故造成的损伤比例最大(约占41.18%),其次是旧伤复发(约占22.06%)、技术动作错误(约占17.65%)和准备活动不合理(约占11.76%)等.     

Oral health in children investigated by Social services on suspicion of child abuse and neglect

Child abuse and neglect (CAN) are likely to have negative consequences on health; however, for oral health, studies on associated outcomes are sparse. The purpose of this study was to assess oral health and oral health behaviors in relation to suspected CAN among children being investigated by the Swedish Social Services. The material comprised data from the Social Services and dental records; the sample, 86 children and 172 matched controls. The children in the study group had a higher prevalence of dental caries than the control group; in addition, levels of non-attendance and dental avoidance were high, as was parental failure to promote good oral health. We found four factors that, taken together, indicated a high probability of being investigated because of suspected CAN: prevalence of dental caries in primary teeth, fillings in permanent teeth, dental health service avoidance, and referral to specialist pediatric dentistry clinics. If all four factors were present, the cumulative probability of being investigated was 0.918. In conclusion, there is a high prevalence of dental caries, irregular attendance, and a need for referral a pediatric dental clinic among Swedish children under investigation due to suspected CAN. Social context is an important factor in assessing the risk of developing dental caries, the inclination to follow treatment plans, and the prerequisites for cooperation during treatment. Routinely requesting dental records during an investigation would provide important information for social workers on parental skills and abilities to fulfill the basic needs of children.     

Implementing environmental enrichment strategies to help children who have sustained a moderate or severe traumatic brain injury

Every year in the UK, a significant number of children sustain a moderate or severe traumatic brain injury (TBI). Children who sustain a moderate or severe TBI have been shown to experience continuing neurological decline in two or more domains up to five years post-injury. Environmental enrichment (EE)—which involves supplementing an environment with appropriately reinforced and rewarded, frequently changing, novel experiences—has been shown to effectively improve social and cognitive functioning in animals with experimental TBI. A growing body of evidence shows EE is also beneficial in the recovery of humans following a TBI. Children who have sustained a moderate or severe TBI often return to school and the educational setting is well-suited for the implementation of EE interventions during the later stages of TBI recovery. This paper reviews a variety of factors pertinent to moderate and severe TBI, neurorehabilitation and EE. It also offers EE considerations for educational professionals who are involved in the development and implementation of school-based interventions for children who have sustained a significant brain injury.     

工业增加值及其影响因素的灰色关联度分析--以江苏省为例

利用灰色关联度模型对江苏省工业增加值与工业用电量、工业贷款额、工业固定资产投资额之间的灰色关联性进行研究。经过求取灰色绝对关联度、灰色相对关联度,进而计算出灰色综合关联度,最终得到工业增加值与工业用电量、工业贷款额、工业固定资产投资额之间的灰色关联性大小,并据此对三种因素进行排序。结果表明,工业贷款额对工业增加值的影响最大,工业用电量、工业固定资产投资额次之。     

一类非自治候鸟种群流行病模型研究

建立一类关于候鸟种群的时变捕食与被捕食生态流行病模型,考虑捕食者染病及饱和接触率、饱和恢复率等因素.借助一种新的方法,给出捕食—食饵种群持久和灭绝的充分条件.