Relation between mineral composition of human hair and common illnesses

The aim of the present study was to find the relation between mineral composition of human hair and illnesses such as infections of the respiratory system,asthma,vertigo,migraine,nervousness,hair loss,dandruff,brittle fingernails and white spots on fingernails.The mineral content of human hair was determined by multielemental analysis using ICP-OES and ICP-MS.Information about the health condition of the examined subjects was obtained by questionnaire.It was found that the hair of individuals who currently suffered from infections of the respiratory system or who had asthma had higher Zr content,the hair of sufferers of vertigo had a lower Ca,La and Sr content and in the hair of migraine sufferers the W content was higher than in the hair of healthy subjects.The level of K in the hair of nervous people was three times higher than in hair of people who never suffered from nervousness.Individuals who complained of hair loss had an increased level of Cu in the hair.For individuals with dandruff,brittle fingernails and white spots on fingernails,the content of Ca and La in the hair was higher than in the hair of individuals who did not suffer from any of these conditions.The results of this study indicate that the metal content in hair could be used in the diagnosis of some common illnesses.     

改进的KNN-SMOreg算法及在铀矿床典型蚀变矿物赤铁矿含量预测中的应用

赤铁矿作为铀矿床蚀变带中一种典型的蚀变矿物,在铀矿勘测过程中具有十分重要的指矿作用.传统的建模方法都以同样的概率来处理每个特征参数的重要性,但在实际建模过程中各个参数的重要性是有差别的,忽略此因素会直接影响赤铁矿预测的精度.针对此问题,本文提出一种基于属性关联的加权K近邻和支持向量机的新混合模型WKNN-SMOreg,...     

沼肥施用方式对灰枣中矿质元素含量的影响

在不同沼肥施用方式条件下分析灰枣果实中主要矿质养分元素的含量,结果表明：不同沼肥施用方式处理的灰枣果实中氮、磷、钾的含量都表现为氮〉钾〉磷,果实中磷的含量在不同施肥方式中变化比较平缓,沼液喷施有利于灰枣果实对氮、钾元素的吸收和积累,而沼夜滴施则有利于磷素的吸收和积累;沼液喷施有利于提高灰枣果实中矿质元素铁、锌、铜、锰、钙、镁的含量,改善果实品质。不同沼肥施用方式中以沼液喷施效果最佳。     

岩石热红外光谱解混与矿物含量反演

 以碱性长石花岗岩为例,采用Turbo FT便携式红外光谱辐射计对其4种组成矿物(钾长石、斜长石、白云母、石英)分别进行0.71—1mm颗粒室外常温、0.71—1mm颗粒室内80℃、块体室外常温的热红外(7—14μm)光谱特征测试,以测试结果作为端元光谱对室外常温下测得的块状碱性长石花岗岩光谱进行解混,并与将ASU光谱作为端元光谱的解混效果进行比较。结果表明,当岩石与矿物端元的光谱测试条件相同时,解混效果最好;使用块状端元光谱能有效解混块状岩石光谱;ASU颗粒光谱不能解混块体岩石的矿物成分及含量。试验结果对遥感地质及矿物填图的研究具有指导意义。     

某天然矿泉水对实验性高脂大鼠血脂水平的影响

目的探讨预防性饮用某天然矿泉水对实验性高脂大鼠血脂水平的影响。方法 28只5周龄的雌性清洁级SD大鼠禁食12h后,内眦采血,测血清中的胆固醇(TC),根据TC水平随机分为高脂模型实验组和高脂模型对照组,每组14只。饲喂髙脂饲料的同时,高脂模型实验组自由饮用某天然矿泉水,高脂模型对照组自由饮用自来水,饮用某天然矿泉水第30 d和40 d,分别禁食12 h后,内眦采血,Autolab 1.0全自动生化分析仪测定血清胆固醇(TC)、甘油三脂(TG)和高密度脂蛋白(HDL-C)水平。结果饮用某天然矿泉水第30 d,高脂模型实验组大鼠血清中TG水平与对照组相比显著降低,差异显著(P0.05),TC和HDL-C水平无显著性差异;第40 d时高脂模型实验组大鼠血清中TG水平与对照组相比极显著降低,差异极显著(P0.01),同时统计学分析表明该天然矿泉水虽未降低TC水平和提高HDL-C水平,但饮用该天然矿泉水后雌性大鼠TC水平有下降的趋势并且HDL-C水平有升高的趋势,而自来水组雌性大鼠TC水平较第30 d时呈现增加的趋势。结论某天然矿泉水具有改善实验性雌性高脂大鼠血脂的趋势。     

某天然矿泉水对高脂大鼠脂质过氧化水平的影响初探

目的初步探讨预防性饮用某天然矿泉水对实验性高脂大鼠脂质过氧化水平的影响。方法SPF级雌性SD大鼠随机分为高脂模型实验组和高脂模型对照组。二组大鼠食用高脂饲料的同时,高脂模型实验组自由饮用某天然矿泉水,高脂模型对照组自由饮用自来水,饮水40 d后,禁食12 h,内眦采血,测定血清总超氧化物歧化酶(T-SOD)和丙二醛(MDA)水平。结果高脂模型实验组大鼠血清MDA水平较对照组显著降低;高脂模型实验组大鼠T-SOD与对照组相比无显著性差异。结论预防性饮用某天然矿泉水可能对缓解高脂大鼠脂质过氧化水平有一定的作用。     

Records of the East Asian winter monsoon from the mud area on the inner shelf of the East China Sea since the mid-Holocene

AMS¹⁴C dating and analysis of grain size, major elements and clay minerals were applied to Core MZ01 from the mud area on the inner shelf of the East China Sea. Based on the environmentally sensitive grain size, clay mineral and major element assemblages, the history of the East Asia winter monsoon since the mid-Holocene could be reconstructed. These three proxies, mean grain size (>9.71 μm), chemical index of alteration (CIA) and ratio of smectite to kaolinite in particular, show similar fluctuation patterns. Furthermore, 10 extreme values corresponding to the contemporary cooling events could be recognized since the mid-Holocene; these extreme values are likely to have been caused by the strengthening of the East Asia winter monsoon. The cooling events correlated well with the results of the δ¹⁸O curves of the Dunde ice core and GISP2, which therefore revealed a regional response to global climate change. Four stages of the East Asia winter monsoon were identified, i.e. 8300–6300 a BP, strong and unstable; 6300–3800 a BP, strong but stable; 3800–1400 a BP, weak and unstable; after 1400 a BP, weak but stable.     

立方体模型周边风致积雪飘移的数值模拟

基于两相流理论模拟立方体周围的积雪飘移.采用各向异性的雷诺应力模型(RSM),通过改进动量方程和湍流方程的源项来考虑雪的浮力和惯性力对风(空气相)的影响.以立方体模型为研究对象,首先将改进模型计算的表面风压分布与实测结果进行了对比,接着把改进模型的雪飘移计算结果与未改进模型的计算结果、实测结果进行了对比.结果显示,改进后模型的模拟结果与实测结果更加吻合,立方体模型周边雪颗粒的沉积侵蚀趋势表现一致.在立方体迎风侧的前方区域及两侧气流分离区出现了明显的侵蚀,紧靠背风侧后方区域出现了沉积.     

含Fe、Mn酸性矿井水水质特征及处理工程实践

含Fe、Mn酸性矿井水是采煤过程产生的一种污染及危害极大的废水。本文介绍了毕节地区典型煤矿含Fe、Mn酸性矿井水的水质特征及处理工程实践。文中介绍的处理工艺处理效果达到相关排放标准及回用标准要求、投资省,值得推广和应用。     

考虑存贷利差的最优消费与投资组合问题

利用贝尔曼动态规划原理和非线性规划原理,研究了在具有存贷利差的条件下,投资者整个生命周期内的消费效用最大化问题.给出了不同条件下最优消费与投资组合的计算公式及相应最大消费效用期望值,同时解释其经济意义;讨论了不同情形下存贷利差对最优消费的影响,求出了投资者在某一时刻财富与消费的关系,并给出直观图例.