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Search Results: 1 - 10 of 2902 matches for " 张家玺 "
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纳米金刚石颗粒对发动机润滑油摩擦学特性的影响
张家玺,刘琨
摩擦学学报 , 2002,
Abstract: 采用爆炸法合成了超精细金刚石颗粒,将金刚石颗粒按一定质量分数分散于普通发动机润滑油(15W/30)中形成固-液二相体系,考察了其摩擦学特性,并分析了润滑剂的减摩抗磨作用机理.结果表明,在边界润滑条件下,由于纳米尺寸效应,超精细金刚石颗粒较易渗透到摩擦副表面并形成极薄的固体润滑膜,从而使得金刚石颗粒/发动机润滑油固-液二相体系表现出优异的承载能力和减摩抗磨性能
内燃机磨合与表面改性实验研究
张家玺,朱均
摩擦学学报 , 2001,
Abstract: 针对EQ6100型汽油机，利用内燃机磨合台架试验装置对所研制的内燃机专用磨合油与普通15W／40内燃机油进行对比磨合试验，对磨合油液进行直读铁谱分析，对缸套－活塞环磨合表面形貌及元素组成进行测试分析。结果表明：专用磨合油的磨合效果明显优于普通内燃机油；超细金刚石微粉可以加速磨合进程，分化并减小磨屑尺寸，从而避免缸壁拉伤和改善缸套－活塞环摩擦副的摩擦学特性。
Experimental Study of Running-in and Surface Modification of Internal Combustion Engine
内燃机磨合与表面改性实验研究
ZHANG Jia xi,ZHU Jun,
张家玺,朱均
摩擦学学报 , 2001,
Abstract: Comparative running in bench test of EQ6100 engine was carried out to investigate the running in effect of conventional 15W/40 internal combustion engine oil and a specially formulated running in oil for the engine (coded as MR oil). A direct reading ferrograph TPD 2 was used to analyze the wear debris compositions of the tested oil sample after running in. The morphologies and elemental compositions of the surface of cylinder piston ring were observed and examined with a Talysurf 6 profilometer and a scanning electron microscope (SEM) equipped with energy dispersive spectrometer (EDAX). As the results, ultra dispersed diamond (UDD) in MR oil helps to accelerate the running in process and to smash larger wear debris in the running in oil to small ones, therefore to prevent the cylinder bore from abrasion by large hard wear debris. This contributes to improve the tribological properties of cylinder piston ring pair and the running in quality.
辽西台里地区新太古代片麻岩杂岩的形成时代、岩石成因和地质意义
蔡丽斌,金巍,郑培玺,张家辉,李斌,王庆龙
矿物岩石 , 2014,
Abstract: 辽西台里地区片麻岩杂岩主要由片麻状花岗岩、黑云斜长片麻岩、角闪斜长片麻岩组成。锆石U-Pb定年结果表明，该套杂岩形成于2510～2559Ma，与“绥中花岗岩”时代相同，同属华北克拉通新太古代结晶岩石。野外产状和岩石组构特征显示，本区片麻岩杂岩为一套同变形的深熔型混合岩。其中，角闪斜长片麻岩代表低度熔融的“古成体”，其间分布少量具“浅色体”特征的长英质岩脉；黑云斜长片麻岩为熔融程度较低的“残留体”；片麻状花岗岩为部分熔融程度最高的“新成体”。它们在矿物组成和地球化学上呈现良好的递变关系。结合前人Hf同位素研究资料，本文认为台里地区片麻岩杂岩可能记录了一期重要的陆壳再造事件。
鞍山地区太古宙早期地壳生长及重熔――来自始-古太古代片麻岩杂岩的岩石学及年代学证据
张家辉,金巍,王亚飞,郑培玺,李斌,李承东
地质学报 , 2015,
Abstract: 本文报道了鞍山地区新厘定的一套始-古太古代片麻岩杂岩的岩石学特征及锆石U-Pb年代学数据，以探讨太古宙早期地壳的形成及演化过程。杂岩在全区广泛分布，野外以包体形式产于约~3.1Ga细粒奥长花岗岩之中。主要包括始太古代奥长花岗岩/石英闪长岩和古太古代片麻岩杂岩两个岩石单元，前者呈透镜体产出于后者之中。始太古代奥长花岗岩/石英闪长岩部分遭受变质作用改造，但整体较好地保留了岩浆结构及构造，其年龄为3.77~3.81Ga，锆石εHf（t）值大于0，表明其为玄武质岩石经部分熔融形成的新生地壳。古太古代片麻岩杂岩由条带状片麻岩、浅色奥长花岗质片麻岩、黑云母片岩及少量斜长角闪岩等组成，岩石类型多样且组构复杂、不均一，受到塑性流变变形作用的改造，为地壳深部层次下变质-深熔作用的产物，各岩石锆石U-Pb年龄相近，为3.29~3.36Ga，锆石εHf（t）值小于0，表明其来源于始太古代古老地壳的重熔。杂岩记录了~3.8Ga、3.7~3.4Ga以及~3.3Ga等多期岩浆-构造热事件，其中~3.8Ga和~3.3Ga分别代表本区主要的两期地壳生长和地壳重熔事件。多期次地壳生长和重熔可能是早期地壳演化的主要机制及过程，这与全球多个太古宙地体类似。
太行山山前中―新生代伸展拆离构造和年代学
张家声,徐杰,万景林,张剑玺,高占武
地质通报 , 2002,
Abstract: 太行山山前中-新生代伸展滑脱的主拆离构造出现在早前寒武纪变质结晶基底和中元古代以后的沉积盖层之间.卷入拆离带中的变形岩石以断层碎裂岩为主,局部形成大规模由基底和盖层岩石碎片组成的构造混杂岩带,结晶基底顶部未见典型的糜棱岩,拆离过程表现为准塑性-脆性变形机制,形成深度应小于10km.太行山山前拆离滑脱带沿走向分为阜平、赞皇两个独立的区段.拆离带中变形岩石的锆石、磷灰石裂变径迹年龄主要集中在68～52Ma和23～18Ma.结合太行山区夷平面年代和相邻盆地构造分析结果,华北大陆地壳的加厚作用可能发生在白垩纪中期(134±9Ma～92±4Ma),主要的伸展滑脱开始于白垩纪末(68Ma前).
书评：《中国旱涝的机理分析和长期预报技术研究》  [PDF]
张家诚
Climate Change Research Letters (CCRL) , 2013, DOI: 10.12677/CCRL.2013.23021
Abstract: 无
Effect of Ultra-Dispersed Diamond Nanoparticles as Additive on the Tribological Properties of 15W/30 Engine Oil
纳米金刚石颗粒对发动机润滑油摩擦学特性的影响
ZHANG Jia-xi,LIU Kun,HU Xian-guo,
张家玺,刘琨,胡献国
摩擦学学报 , 2002,
Abstract: Diamond nanoparticles were prepared by detonation of explosives with negative oxygen balance. The effect of the diamond nanoparticles as additive on the tribological behavior of 15W/30 engine oil was examined by means of bench test of cylinder liner/piston ring and ball-on-disc friction and wear test, respectively. The action mechanism of the diamond nanoparticles is discussed as well. As the results, the diamond nanoparticle as additive has little effect on the physical-chemical properties of the base stock but improves the tribological behavior of the base stock considerably. Namely, the load-carrying capacity and friction-reducing and antiwear ability of the 15W/30 engine oil were greatly increased by the addition of the diamond nanoparticles. This could be attributed to the formation of a boundary lubricating film containing diamond nanoparticles on the rubbing surface. In other words, the diamond nanoparticles act to increase the load-carrying capacity and decrease the wear of the frictional pair considerably, because they have high hardness and are liable to deposit on the rubbing surface owing to their small-scale effect. Such a kind of wear-resistant and load-carrying capacity of the diamond nanoparticles as additive could be confirmed by the increase of the worn surface hardness.
干旱胁迫条件下小麦各器官可溶性碳水化合物积累转运相关性状遗传分析
Genetic analysis of WSC’s accumulation and transport characteristics in different vegetative organs in wheat natural population under drought stress
张家乐,栗孟飞,杨德龙,刘媛,陈菁菁,程宏波,常磊,柴守玺
- , 2018, DOI: 10.7606/j.issn.1000-7601.2018.04.38
Abstract: 以小麦自然群体196个品种（系）为研究材料，研究了干旱胁迫（DS）和正常灌溉（WW）条件下，小麦不同发育阶段各器官可溶性碳水化合物（WSC）含量、转运率及其对籽粒贡献率，以及主穗粒重的遗传特性及各目标性状之间的相关性。结果表明：在两种水分条件下，小麦自然群体各目标性状表型变异广泛，变异系数在7.11%~68.55%（DS）和9.50%~57.37%（WW），多样性指数在0.61~0.93（DS）和0.62~0.88（WW），遗传力在0.24~0.53。各目标性状表型受发育阶段、器官和水分环境的显著影响(F=1.95**~32 775.74**)。其中，WSC含量受发育阶段和器官的影响显著(F=32 775.74**,11 223.18**)，WSC转运率受水分环境的影响显著(F=245.07**,274.61**)，而WSC转运对籽粒的贡献率受器官显著影响(F=1 482.96**,390.15**)。灌浆中期WSC含量与主茎穗粒重之间均表现出显著或极显著正相关（r=0.15**~0.36**），且干旱胁迫条件下相关系数更高（r=0.21**~0.36**）。倒二节WSC相关性状表型变异系数、多样性指数，以及与其他性状表型的相关系数均达到最高。通过对灌浆期倒二节WSC积累转运相关性状表型值聚类分析，得到15个灌浆期WSC含量、花前转运率及贡献率较高的品种（系）。
A natural population composed of 165 wheat cultivars/lines was used to study genetic characteristics of water soluble carbohydrates (WSC)'s accumulation, transport rate, its contribution to grain mass, and the grain weight of the main spike at the different growth stages, as well as the correlations between the target traits under drought stress (DS) and well-watered (WW) conditions. The results showed that under the two types of water conditions, the phenotypic variation of each trait in the natural population was extensiveand the coefficients of variations ranged from 7.11% to 68.55% under DS and from 9.50% to 57.37% under WW. The diversity index varied from 0.61 to 0.93 under DS and from 0.62 to 0.88 under WW. The heritabilityvariedfrom 0.24 to 0.53. The phenotypic value of each target trait was significantly affected by the developmental stage, the organ and the water environment(F=1.95**~32 775.74**). WSC content was significantly affected by developmental stageand organs(F=32 775.74**,11 223.18**), WSC transport rate was significantly affected by water environments (F=245.07**,274.61**), and WSC contribution rate to grain filling was significantly affected by organs (F=1 482.96**,390.15**). There was a significant or highly significant positive correlation between the WSC content and grain weight per main spike in the middle grain-filling stage (r=0.15**~0.36**), with higher correlation coefficient under the DS (r=0.21**~0.36**). The phenotypic variation coefficient, diversity index and correlation coefficient with othertrait phenotypeof WSC-related traits reached the highest in penultimate internodes. Based on the cluster analysis of WSC-accumulation-related traits in penultimate internodes, 15 accessions were selected with higher WSC content in grain-filling stage and higher WSC remobilization rate and contribution rate in pre-anthesis stage.
我国出口服务贸易商品结构影响因素研究
Study on the Influence Factors of Commodity Structure of China’s Service Export  [PDF]
张家瑾, 徐倩
World Economic Research (WER) , 2015, DOI: 10.12677/WER.2015.43007
Abstract:
本文对我国出口服务贸易商品结构进行了统计分析，并利用我国1997年~2013年相关数据建模，对我国出口服务贸易商品结构及其影响因素进行实证分析。分析结果显示，相关产业(货物贸易出口)、技术水平(互联网发展)、汇率水平、服务贸易开放度和实际利用外资额是影响我国出口服务贸易商品结构的主要因素。
Firstly, statistic analysis of commodity structure of China’s service export will be given. And then we build models involving commodity structure of China’s service export and its influence factors, using relevant annual data from 1997 to 2013. To conclude, the related industries (trade in goods exports), the technical level (of the Internet), exchange rate, service trade openness and the actual utilization of foreign trade commodity structure of exports serve the main factors of China’s export commodity structure of trade in services.
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