一汽锡柴电控共轨国Ⅲ柴油发动机及其整车电路（Ⅰ）

介绍一汽锡柴国Ⅲ电控共轨柴油发动机的分类,列出几种锡柴国Ⅲ电控发动机电路,以装载CA4DF3-15E3发动机的CA6102SH2Y客车整车电路为例,详细阐述其电控系统功能,线束及插接件,故障诊断方法及步骤,电气维护等。     

Research Progress of Interfacial Chemism of High Efficiency Organic Grinding Fluid for Si3N4 Ceramics

IntroductionGrinding is a most important machiningmethod for Si3N4ceramics. There is much re-searche on the grinding fluid acting as one of keyconditions in grinding, but rare on the applicationin engineering ceramics machining, especially Si3N4ceramics. Utilizing interfacial chemistry reactionmembrane can reduce friction coefficiem, and soft-en surface layer can improve the grinding efficiencyof Si3N4ceramics, which is a bran-new research di-rection. Because that the friction coefficient b…     

Cross-shelf circulation and phytoplankton distribution at the summertime New England shelfbreak front

We investigate aspects of the secondary (cross-shelf) circulation at the Middle Atlantic Bight shelfbreak front using high-resolution data collected on the New England Shelf in August 2002. The alongshore shelfbreak jet coincides with the front at the seaward edge of the cold pool (remnant winter shelf water) and there is a suggestion of a cross-stream convergence centered at the jet core. Despite indications of convergence we found no evidence of a surface subduction on the seaward side of the front. At depth 70 m near the shelfbreak there was a patch of chlorophyll, located within a local temperature–salinity maximum which, though significantly below the euphotic zone, appeared to be photo-acclimated and viable. The chlorophyll feature could be the result of a local subduction by a larger scale eddy circulation seaward of the front.Dye tracer experiments directly observed the convergence at the foot of the shelfbreak front and subsequent upwelling of bottom boundary layer water along the shoreward side of the shelfbreak front. But, we found no evidence that this upwelling influenced productivity at the front. Further, since there was no cross-shelf maximum in subsurface chlorophyll at the front, we conclude that this productivity is in general, sustained by a broadly distributed local vertical nutrient flux from an underlying nutrient reservoir.     

四乙基碘化铵相转移催化合成N，N-二乙基苯胺

用四乙基碘化铵作相转移催化剂,在常压下由苯胺和溴乙烷合成N,N-二乙基苯胺,研究了多种反应因素对目的产物产率的影响,提出了常压催化合成目的产物的最佳工艺条件是：苯胺和溴乙烷的摩尔比为1：2.5,催化剂用量0．6g,在40mL质量分数为30×10^-2的氢氧化钠溶液中,反应温度55℃,常压反应5h,产品收率95．6％。     

PAG电刺激和微注射吗啡对脊髓WDR和NS神经元放电的影响

中脑导水管周围灰质 (PAG)电刺激和微注射吗啡均能显著抑制广动力型 (WDR)和特殊伤害感受 (NS)神经元的伤害感受性放电。但是对 NS神经元放电的抑制明显地大于对 WDR神经元。电刺激 PAG能完全抑制 NS神经元的伤害感受性放电。于 PAG微注射吗啡后 ,NS神经元和 WDR神经元的伤害感受性放电均显著减少。但 NS神经元受抑制的程度更大。电刺激 PAG能使外周传入诱发的背根电位 (DPR)慢电位 (DR- 波 )明显增大 (P <0 .0 0 1)。本研究结果揭示 ,PAG对脊髓 WDR和 NS神经元活动的抑制作用的程度 ,具有明显的差异性 ,以对 NS神经元的抑制为著。由观察 DRP的结果提示 ,在 PAG对脊髓伤害感受神经元的下行抑制作用中 ,可能有突触前抑制参与。     

解决N车型外后视镜调节失效问题

车辆后视系统由车外反射镜和广角透镜组成,在车辆安全系统中起着重要的作用。现有的汽车后视镜系统还存在许多问题亟待解决,如汽车转向过程中的盲区等。本文提出了一种新型的智能车辆后视系统的设计方案,该系统能够在不同的行驶条件下自动调节车辆外部镜头的角度。影响因素包括车辆转向角、行驶速度和车辆尺寸参数。本设计以AT90C516RD+单片机为核心控制单元。该系统增加了一个新的自动模式与现有的手动功能保留。通过理论仿真和模型试验,证明该设计完全可行,并已被具有工业潜力的客户调查所接受。     

船舶氮氧气体制备工艺

介绍了现阶段采用空气分离方法制备氮气和氧气的工艺。在船舶上安装空分装置,以舱室空气为原料,现场制备是解决船舶用氮气和氧气的有效方法。空分法主要有4种工艺:燃烧法、变压吸附法、膜分离法与深冷法。分析比较了4种工艺的原理、实施流程、特点及船舶适应性,提出了当前须解决的技术难点。在船舶设计过程中,根据不同类型、不同吨位的船舶对气体的需求及船舶的具体任务,而选择相应的气体制备工艺和装置。     

玉柴国Ⅳ客车发动机电气原理

阐述广西玉柴机器股份有限公司国Ⅳ发动机电控系统和整车的电气原理,详细介绍各部件的功能、OBD系统,及电控发动机车辆线束的制作要求。重点介绍SCR系统及其与车辆间的电气连接,并给出整车电路连接图。     

Vertical profiles of particulate organic matter and its relationship with chlorophyll-a in the upper layer of the NE Mediterranean Sea

Particulate organic matter (POM), nutrients, chlorophyll-a (CHL) and primary production measurements were performed in the upper layer of three different regions (cyclonic, anticyclonic and frontal+peripherial) of the NE Mediterranean Sea in 1991–1994. Depth profiles of bulk POM exhibited a subsurface maximum, coinciding with the deep chlorophyll maximum (DCM) established near the base of the euphotic zone of the Rhodes cyclone and its periphery, where the nutricline was situated just below the euphotic zone for most of the year. Moreover, the POM peaks were broader and situated at shallower depths in late winter–early spring as compared to its position in the summer–autumn period. Under prolonged winter conditions, as experienced in March 1992, the characteristic POM feature disappeared in the center of the Rhodes cyclone, where the upper layer was entirely occupied by nutrient-rich Levantine deep water. Deep convective processes in the cyclonic gyre led to the formation of vertically uniform POM profiles with low concentrations of particulate organic carbon (POC) (2.1 μM), nitrogen (0.21 μM), total particulate phosphorus (PP) (0.02 μM) and chlorophyll-a (0.5 μg/L) in the euphotic zone. Though the Levantine deep waters ascended up to the surface layer with the nitrate/phosphate molar ratios (28–29) in March 1992, the N/P molar ratio of bulk POM in the upper layer was low as 10–12, indicating luxury consumption of phosphate during algal production. Depth-integrated primary production in the euphotic zone ranged from 38.5 for oligotrophic autumn to 457 mg C m⁻² day⁻¹ for moderately mesotrophic cool winter conditions.