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Search Results: 1 - 10 of 127514 matches for " 孙红川 "
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减小入厂煤采样系统误差
,胡月,杨映
热力发电 , 2007,
Abstract: 现场调查发现,入厂煤质检测存在较大的采样系统误差,通过对比试验,提出了减小这些误差的方法:(1)取样深度由原来的0.4m改为0.6m;(2)入厂煤粒度≥100mm时,子样质量定为≥7.5kg。采用这一方法后,全水分测量的系统误差为-0.1%,干燥基高位发热量测量未出现系统误差。所述方法可供相关标准修行订时参考。
用激光衍射法研究红细胞在低粘切变流场中的取向和变形及其生物物理意义
文宗曜,高铁,宋立,大公,吕智,施岩,
中国科学 生命科学 , 1998,
Abstract: 采用一种新型激光衍射法,对不同浓度WGA处理的红细胞进行测量,进一步研究了红细胞在低粘切变流场中的流变特性.通过用DPH探剂标记的荧光偏振法,用马来酰亚胺(MSL)标记的电子顺磁共振法,揭示了新激光衍射法所描写的红细胞在低粘切变流场中取向指数(DIor)与等容小变形指数(DId)的生物物理意义
初中阶段青少年健康行为的因素结构特点分析
,王耘,燕青,王昌海,董奇
心里发展与教育 , 2001,
Abstract: 本研究以北京地区398名初中学生为被试,以适度睡眠、合理饮食、口腔卫生、体育锻炼、防止久坐五类健康促进行为与冒险、越轨、吸烟、过量饮酒、冒险骑车五类健康危害行为为对象,对其健康行为的因素结构特点进行了分析。研究结果表明,初中阶段青少年的健康危害行为间具有显著的正相关,而健康促进行为间的关系则较为复杂。验证性因素分析结果表明,初中阶段青少年健康行为的因素结构主要包含了两个因素,其中健康生活习惯因素主要包括适度睡眠、合理饮食与口腔卫生三类健康促进行为;冒险生活方式因素则包括了冒险、越轨、吸烟、过量饮酒、冒险骑车五类健康危害行为以及体育锻炼、防止久坐两类健康促进行为。
河北核桃(juglanshopeiensishu)光合特性的研究
王红霞,张志华,王文江,高仪,
园艺学报 , 2005,
Abstract: 以河北核桃‘艺核1号’等为试材,利用ci-301ps便携式光合作用测定仪,在田间条件下,研究了河北核桃的光合特性。结果表明:‘艺核1号’光饱合点为1643μmol·m-2·s-1左右,光补偿点为50μmol·m-2·s-1左右,最适温度为29℃;光合速率日变化为“中午降低型”的双峰曲线;净光合速率的季节变化为双峰曲线,第1峰出现在5月中旬,第2峰出现在8月上旬;影响光合速率日变化的主要因子依次是气孔导度、光合有效辐射、叶温、胞间co2浓度和蒸腾速率。河北核桃净光合速率低于普通核桃,接近于核桃楸。
基于NIR和GIS的甘蔗含糖量与种植条件关系研究
杜建,丽娅,张永康,上野正实,满芳信
中国生态农业学报 , 2010,
Abstract: 为监测较大区域内甘蔗产量及含糖量的时间、空间变化情况,了解地区、环境及土壤成分与甘蔗含糖量的关系,为甘蔗栽培提供指导,以日本琉球群岛南大东岛甘蔗栽培区为对象,用NIR方法测定甘蔗含糖量及其他成分含量,采用GIS技术建立地块位置、甘蔗产量、含糖量及P、K含量和土壤K含量数据库。在此基础上,建立3个栽培年度甘蔗含糖量、单产与甘蔗汁P、K含量的空间分布图,发现甘蔗含糖量与降水量及种植区水环境密切相关。对甘蔗含糖量及P、K含量和土壤K含量的相关分析表明,甘蔗含糖量与甘蔗汁P含量呈正相关,而与甘蔗汁和土壤K含量均呈负相关。
基于张力构件特性的张力穹顶温度响应分析
巩同,国军,薛素铎,叶继
工业建筑 , 2015, DOI: 10.13204/j.gyjz201508002
Abstract: 不同张力构件的热膨胀性能存在明显区别。为了研究张力构件热膨胀性能对张力穹顶温度响应,以肋环型张力穹顶为例,分别开展不同特性张力构件布置方式对索穹顶温度响应影响规律研究。结果表明在正常设计范围内,改变预应力水平,仅能改变张力穹顶中极限温度作用,不能改变各张力构件内力对温度敏感性;在升温过程中下部张力杆件的热膨胀性能对各张力构件温度敏感性影响较大;在一致温度场中,张力穹顶最外圈的脊部张力构件是温度敏感性最高的构件。
HRT对异养硝化好氧反硝化菌处理高速列车真空集便废水的影响
于海明,刘晶晶,翟计,石玉,刘志强,井梅
环境工程学报 , 2014,
Abstract: 利用具有良好异养硝化好氧反硝化功能的菌剂启动生物接触氧化工艺,用以处理经化粪池厌氧消化后的高速列车真空集便废水.重点研究了HRT对生物膜反应器中好氧反硝化菌处理列车集便废水的影响,并进行了动力学模型分析.实验结果表明,在选用立体弹性填料为生物膜载体时,系统的最佳HRT为6h.该条件下,反应器稳定运行的COD、总氮和氨氮的去除率均大于80%.通过对系统底物降解动力学的初步探究,得出了相关降解动力学常数KS、μmax.经验证,Monod模型较好地描述了系统的基质降解动力学行为,为高速列车真空集便废水的处理提供了相对高效、简便的方法.
田间条件下核桃光合特性的研究
王红霞,张志华,王文江,
华北农学报 , 2007, DOI: 10.3321/j.issn:1000-7091.2007.02.030
Abstract: 以普通核桃品种清香为主要试材,利用CI-301PS便携式光合作用测定仪系统,在田间条件下,研究了核桃的光合特性。结果表明:核桃光饱和点为1610μmol/(m2·s)左右,光补偿点为40μmol/(m2·s)左右,光合最适温度为27℃;核桃的光合日变化为双峰曲线,有明显的“光合午休”现象;核桃光合季节变化为单峰曲线,最高峰出现在5月中旬。影响核桃光合日变化的主要因子依次是胞间CO2浓度、叶温、气孔导度、光合有效辐射和蒸腾速率;不同品种间净光合速率有明显差异。
基于实时二维剪切波弹性成像的正常肝脏弹性模量值探讨
张悦,庄园,,,徐晨,徐亚丹,王文平
- , 2017,
Abstract:
Objective To establish the normal reference value of elastic modulus in healthy liver by two-dimensional shear wave elastography (2D-SWE) technology,using pathology as the gold standard,based on the repeatability study.Methods Liver stiffness measurements were firstly performed in 42 healthy volunteers with 2D-SWE by a senior and a junior physician,respectively.The intra- and inter- difference of liver stiffness measured with 2D-SWE were investigated to discuss the methodology efficacy.By setting strict criterion,128 histologically proven non-fibrosis subjects successfully underwent 2D-SWE preoperatively were enrolled in the research to determine the normal reference values of hepatic elasticity.Results 2D-SWE technique showed a good repeatability with the intra-class correlation coefficients of 0.984 and 0.978 for the senior and the junior physician,respectively.There was no significant difference in the measurement of hepatic stiffness between different operators (P=0.121).The hepatic stiffness of histologically proven normal livers measured with 2D-SWE ranged from 4.33 kPa to 7.40 kPa.The liver stiffness measurement was slightly higher in males than that in females (P=0.013),and there was no statistically difference between different age groups and mild inflammation groups (P=0.775,P=0.138).Conclusions 2D-SWE technology possesses high stability.Hepatic stiffness of 4.33-7.40 kPa is recommended to be the normal reference values,and it is a highly reliable basis of the diagnosis system for liver fibrosis.
大学毕业生目标自主性与无望感:社会支持与性别的作用
Goal Striving and Hopelessness in The College-to-career Transition: The Role of Gender and Social Support

,宁彩芳,黄四林,窦东徽,,张梅
- , 2015, DOI: 10.16187/j.cnki.issn1001-4918.2015.04.09
Abstract: 大学毕业生面临重要的生活转折, 其个人目标自主性对未来的无望感有显著影响。本研究以192名大四毕业生为被试, 采用特殊目标测量法考察个人目标自主性, 用问卷评价社会支持与无望感, 探讨目标自主性与无望感的关系, 并分析社会支持和性别的作用。结果发现:(1)毕业前夕去向已经确定的大学生, 无望感更低;(2)大四毕业生目标自主性越高, 对未来的无望感越低;(3)目标自主性对无望感的预测受到性别因素调节。对于男生, 高目标自主性能够显著降低无望感;对于女生, 目标自主性对无望感的预测作用不显著;(4)社会支持对于目标自主性与无望感之间的关系没有显著的调节作用, 但是社会支持越高, 其无望感越低。由此可见, 大学毕业生建立自主的个人目标和改善社会支持对降低无望感具有重要意义, 目标自主性的效应对男生尤为明显。
Graduation is an important transition in life for college students. What they feel about their personal goals and social support has a great influence on the feeling of hopelessness for future. The present research recruited 192 senior college students and investigated the autonomy of personal goals by adopting the target-measurement approach and further evaluated social support and hopelessness for future by using questionnaires. The results showed that (1) Students who have a settled destination showed remarkably higher hopeless feeling than others. (2) The higher the goal autonomy, the lower the degree of hopelessness for future would be. (3) The more social support they felt, the lower the degree of hopelessness would be. (4) The influence of goal autonomy on the feeling of hopelessness is greater for male students than for female students. The result indicates that when facing significant transition in life during Emerging Adulthood, one can adjust its pessimistic expectation to future by constructing autonomous individual goals and improving social support; what's more, the emphasis of education should be distinguished between genders.
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