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Search Results: 1 - 10 of 138095 matches for " 安文超 "
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南四湖及主要入湖河流表层沉积物对磷酸盐的吸附特征
,李小明
环境科学 , 2008,
Abstract: 研究了南四湖及其主要河流入湖口18个表层沉积物对磷的吸附能力、吸附动力学及其吸附等温线,并对湖区沉积物对磷吸附特征及其理化特征之间的关系进行了探讨.结果表明,对于处于不同营养水平的沉积物,对磷酸盐的吸附具有一致的特征.在前10h沉积物对磷酸盐的吸附量基本达到或超过平衡吸附量的80%,并且在0~1.0h内吸附反应迅速.在本研究条件下,表层沉积物的CEPC的变化范围为0.010~0.157 mg·L-1,Qmax的变化范围是86.74~118.32mg·kg-1,TQmax的变化范围是99.97~281.11mg·kg-1.CEPC、NAP、M、Qmax和TQmax与Ads-P都具有显著的正相关关系,沉积物Ads-P含量可以作为指导南四湖水体污染程度的一项指标.M与TQmax之间具有显著的正相关性,吸附效率不仅体现的是对外来磷的吸附效率,还应当包含对本身释放磷的再吸附的效率.对于南四湖沉积物TQmax、NAP和Qmax起到同样的贡献.沉积物的NAP与CEPC之间呈显著正相关性,总的趋势就是,当上覆水中磷含量相等时,具有高的NAP的沉积物易于向上覆水体释磷,反之具有较低NAP的沉积物易从水中吸附磷.
从铁矿石谈判看中国铁矿资源可持续发展
邱锦,
矿床地质 , 2010,
Abstract:
南四湖及主要入湖河流河口区表层沉积物磷的形态与分布特征研究
,张书武,和慧,李小明
环境科学学报 , 2012,
Abstract: 利用化学连续提取法对南四湖湖区及主要入湖河流河口区的表层沉积物样品中的磷的化学形态进行了提取.分析结果表明:南阳湖、独山湖和位于湖西的入湖河流沉积物中总磷含量较高,变化范围为571.67~1113.55mg·kg-1;不同形态磷的含量差异较大,排序为:钙磷(Ca-P)>有机磷(OP)>弱吸附态磷(Ads-P)>铁磷(Fe-P)>铝磷(Al-P);TP与Ca-P、Ads-P、OP之间存在正相关关系,相关系数r分别为0.85(p<0.01)、0.85(p<0.01)和0.63(p<0.01);Ads-P与Ca-P、Ads-P与OP之间也存在正相关关系,r分别为0.74(p<0.01)和0.60(p<0.05);Fe-P与Ca-P之间存在负相关关系(r=-0.62,p<0.05);BAP只与OP之间显著正相关(r=0.82,p<0.01),由OP可以粗略地估算出沉积物中潜在的可释放磷,即有效的内源磷负荷;南四湖沉积物中有机磷的含量很大程度上取决于有机质含量的多少.
大颗粒辉钼矿Re-Os同位素失耦现象及187Os迁移模式研究
,,
矿床地质 , 2009,
Abstract: 对采自西华山钨矿的大颗粒辉钼矿样品的不同部位进行了取样,并对其年龄分别进行精确厘定,得到了不同的Re-Os模式年龄值,验证了失耦现象的存在。从原理上对失耦现象及其成因进行了解释,并在前人成果的基础上,探索性地提出了187Os可能的迁移模型。取样方式的不同会对辉钼矿的模式年龄产生很大影响,因此,在实际应用中一定要严格遵循“多取样,细磨碎”的原则,这对于能获得科学真实的与地质背景相符的Re-Os同位素地质年龄,从而深入探讨矿床成矿作用具有重要意义。
社会支持对震后青少年创伤后应激障碍和创伤后成长的影响:自我效能感的中介作用
The Relationship between Social Support, Posttraumatic Stress Disorder and Posttraumatic Growth among Adolescents after Wenchuan Earthquake: Understanding the Role of Self-efficacy

媛媛,苑广哲,伍新春,
- , 2018, DOI: 10.16187/j.cnki.issn1001-4918.2018.01.12
Abstract: 本研究采用创伤暴露问卷、社会支持问卷、自我效能感量表、创伤后应激障碍症状核查表和创伤后成长问卷,在汶川地震8.5年后对地震极重灾区的1185名中学生进行调查,考察社会支持对创伤后应激障碍(PTSD)和创伤后成长(PTG)的影响,并检验自我效能感在其中的中介作用。结果发现:在控制创伤暴露程度、性别和年龄等变量后,社会支持不仅可以直接负向预测PTSD、正向预测PTG,也可以通过自我效能感的中介作用负向预测PTSD、正向预测PTG。这表明,自我效能感在社会支持与PTSD、社会支持与PTG的关系中都具有部分中介效应。
To examine the relationship among adopting traumatic exposure questionnaire, social support, self-efficacy, posttraumatic stress disorder (PTSD) and posttraumatic growth (PTG), this study investigates 1185 adolescents at 8.5 years after Wenchuan earthquake by using social support scale, the self-efficacy scale, the modified DSM-5 PTSD checklist and posttraumatic growth inventory. The structural equation model was used to examine the relationship, wherein the traumatic exposure would be controlled because its importance. The results found that after controlling for traumatic exposure, social support has direct and negative effect on PTSD, and it can also exert indirect and negative effect on PTSD via self-efficacy. In addition, social support has direct and positive effect on PTG, and it may also positively affect PTG via self-efficacy.
群智感知中采用节点社会属性的亲密度量化方法
Intimacy Relationship Quantification Method among Nodes Based on Social Attributes in Crowd Sensing

,桂小林,蔡宁,
- , 2017, DOI: 10.7652/xjtuxb201706012
Abstract: 针对群智感知中节点社会关系计算存在的层次关系划分不清、关联因子描述粗糙等问题,提出一种采用社会属性的亲密度量化方法。该方法通过分析影响节点社会关系的多维要素,将节点属性因子划分为静态和动态两个维度。通过构造多维语义分级树和空间索引编码,对节点静态属性进行挖掘和形式化表示。同时,引入交互信息熵,对社会关系的不对称性进行分析和比较,以提高亲密度量化方法的客观性。基于层次分析法实现节点动态属性的二级评判和有效聚合,并通过节点融合度对亲密关系进行二次修正。实验结果表明:与已有方法相比,采用社会属性的亲密度量化方法预测准确率提高了14.67%,该方法能够有效降低群智感知中移动节点的误判概率,提高网络社团识别准确率,为候选服务节点集的选择提供有效依据。
A new method, called social??based nodes intimacy quantification method (SNIQ), is proposed to solve the problem of unclear hierarchy and rough associated attribute description in nodes social relationships quantification. A formal representation of social attributes is presented by means of static semantic hierarchy tree and spatial index coding to analyze multi??dimension factors that influence nodes social relationship. The asymmetry of social relations of nodes is reasonably evaluated by introducing the interactive information entropy. Furthermore, analytic hierarchy process (AHP) is used to achieve two??level judgment and effective aggregation of node dynamic attributes, and a fusion degree of nodes is introduced to dynamically modify intimacy relationships of nodes. Experimental results show that SNIQ is better than the traditional algorithms in accuracy and recall rate in the process of getting nodes intimacy relationships, and effectively improves the success rate of nodes selection in crowd sensing. Comparisons with the existing algorithms show that the proposed SNIQ achieves 14.67% improvement in prediction accuracy
Ca2+信号途径参与稻瘟病菌分生孢子萌发及附着胞形成的调控
王立,王源,李昌,郑小波
菌物学报 , 2003,
Abstract: 为了确定Ca2+信号途径是否参与、在哪一时期参与稻瘟病菌分生孢子萌发及附着胞形成过程的调控,用四种可从不同位点阻断Ca2+信号途径的抑制剂分别处理分生孢子,观察抑制剂对孢子萌发及附着胞形成过程的抑制作用。结果表明:Ca2+螯合剂EGTA、Ca2+通道抑制剂Verapamil、抑制磷脂酶C活性的抑制剂U-73122、影响钙调素与钙调素依赖蛋白激酶作用位点的抑制剂KN-93,随着浓度的增加,对孢子萌发和附着胞形成过程的抑制作用明显增强;同一浓度下,抑制剂对附着胞形成过程的抑制作用大于孢子萌发过程;抑制剂影响孢子萌发和附着胞形成过程在萌发早期(1~4h)最有效;在完全被抑制、不能萌发的孢子内出现了许多颗粒状囊泡;抑制剂可使附着胞形态明显变小甚至不能形成。以上结果表明钙信号途径参与了稻瘟病菌孢子萌发及疏水条件下附着胞形成过程的调控。
Phosphate Adsorption Characteristics on Surface Sediments of Nansi Lake and Its Main Inflow Rivers
南四湖及主要入湖河流表层沉积物对磷酸盐的吸附特征

AN Wen-chao,LI Xiao-ming,
,李小明

环境科学 , 2008,
Abstract: Adsorption capacity, isotherms and kinetics of phosphate onto the 18 surface sediments taken from Nansi Lake and its main inflow rivers were investigated in laboratory, and the relationships between physical and chemical properties of the sediments and their phosphate adsorption characteristics are discussed. The results indicate that the phosphate adsorption characteristics of sediments that are at different trophic levels are similar. The amount of phosphate adsorbed within 10 h almost reaches or exceeds 80% of the maximum adsorption of phosphate and the maximum adsorption rates occur within 0-1.0 h. C(EPC) ranges from 0.010 to 0.157 mg x L(-1), Q(max) from 86.74-118.32 mg x kg(-1), and TQ(max) from 99.97-281.11 mg x kg(-1) in the study. Between Ads-P and its c(EPC), NAP, m, Q(max) and TQ(max) have remarkable positive correlation. The content of Ads-P will serve as a index indicating the polluted level in Nansi Lake. Adsorption efficiency (m) has remarkable positive relationship with TQ(max). The m is the sum of adsorption efficiency of the sediments adsorbing the phosphorus coming from external and the phosphorus desorbed from the sediments. The NAP has positive correlation with c(EPC) and the trend is that the sediment with higher NAP easily desorbs phosphorus to the water, contrarily the sediment with lower NAP easily adsorbs phosphorus.
Ca2+信号途径参与稻瘟病菌分生孢子萌发及附着胞形成的调控
王立,王源,李昌,郑小波
菌物学报 , 2003,
Abstract: 为了确定Ca2+信号途径是否参与、在哪一时期参与稻瘟病菌分生孢子萌发及附着胞形成过程的调控,用四种可从不同位点阻断Ca2+信号途径的抑制剂分别处理分生孢子,观察抑制剂对孢子萌发及附着胞形成过程的抑制作用。结果表明:Ca2+螯合剂EGTA、Ca2+通道抑制剂Verapamil、抑制磷脂酶C活性的抑制剂U-73122、影响钙调素与钙调素依赖蛋白激酶作用位点的抑制剂KN-93,随着浓度的增加,对孢子萌发和附着胞形成过程的抑制作用明显增强;同一浓度下,抑制剂对附着胞形成过程的抑制作用大于孢子萌发过程;抑制剂影响孢子萌发和附着胞形成过程在萌发早期(1~4h)最有效;在完全被抑制、不能萌发的孢子内出现了许多颗粒状囊泡;抑制剂可使附着胞形态明显变小甚至不能形成。以上结果表明钙信号途径参与了稻瘟病菌孢子萌发及疏水条件下附着胞形成过程的调控。
煤矿磁化水喷雾降尘机理及试验研究
陈梅岭,,蒋仲,王明,谭聪
煤炭科学技术 , 2014,
Abstract: 为了探究磁化水喷雾对采掘工作面粉尘的降尘效果,通过试验测定了新型磁水器磁化处理后水的表面张力、动力黏度以及对粉尘的润湿性,并建立了掘进巷道相似模型,研究了不同参数下磁化水的降尘效果。结果表明:磁化处理后水的表面张力、动力黏度均有所降低,磁水器距离出水口越近,磁化水的表面张力和动力黏度降低越大,磁化效果越好;磁化水对粉尘的润湿性优于非磁化水,降尘率较非磁化水也有较大程度提高,试验结果表明,磁感应强度170mT、水压2MPa条件为磁化水降尘的最佳条件,其降尘率比非磁化水提高了16.36%。
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