查询词典 particle

The passive tracking dynamics is modeled by the turn rate, and the basic steps of the nonlinear particle filter are discussed. According to constraint conditions including the terrain data and the maneuvering capability of the target, outrange particles are discarded during prediction and update steps, and the distribution and the weight of particles are adjusted. The performance and the RMSE are analyzed by comparison simulations with the unconstraint particle filter.

使用转弯率概念建立了被动跟踪模型，阐述了非线性粒子滤波的基本过程；通过设定地域和机动性能约束条件，抛弃约束外粒子，并对粒子分布和权重进行调整，利用CPF进行了目标跟踪仿真实验，与无约束的粒子滤波跟踪进行了对比，分析了轨迹跟踪性能，比较了跟踪误差。

First,This pape introduces the principle of particle system and makes a further study on the basic model of firework particle system and the principle of letting off fireworks.

本文首先阐述了粒子系统的基本原理，对烟花粒子系统的基本模型和燃放原理进行了分析。

The invention discloses anti-collision elastic material, which mainly consists of epoxy resin, polybasic amine curing agent, metal powder and slate powder enhanced particle, and the weight proportion of each component is as follows: epoxy resin of 25 to 30 parts, polybasic amine curing agent of 10 to 16 parts, metal powder of 42 to 45 parts and slate powder enhanced particle of 54 to 58 parts.

本发明公开了一种防撞击的弹性材料，其主要成分有环氧树脂和多元胺类固化剂，以及金属粉和石粉增强粒子，各组分的重量配比是：环氧树脂25～30，多胺类固化剂10～16，金属粉42～45，石粉增强粒子54～58。

Based on the technique from micrometer particle dispersion, superfine particle dispersion behavior and its effect on polymere.

结合微米分散技术基础，对超微颗粒在聚合物固体中分散及其结晶研究的进展深入探讨，揭示了聚合物基-纳米复合材料的颗粒分散经过纳米前驱物中间阶段，再进行聚合复合与熔体复合，得到颗粒均匀的分散体系。

The results showed that 7-day-precultured embryogenic calli had the best responses for bombardment among 2-7 day' preculture duration. Enhanced transformation efficiency was found in the explants treated with high osmotic medium 4h prior to till 24 h after bombardment. Particles of gold and tungsten were both found suitable for rice transformation and there was no adverse effect when tungsten particles were reduced to 1/3 standard amount for DNA precipitation on transient GUS gene expression. However, it was found that gold particle had higher GUS expression at 120 h post-bombardment. A preliminary microprojectile transformation system with an average of 15-20 blue spots/explant GUS expression was routinely obtained for 'Tainung 67' by using the particle gun with 1,100 psi rupture disk, 6 or 9 cm microcarrier flight distance and 4 mm of macrocarrier flight distance setting.

初步结果显示，以预培养2~7日之胚性癒合组织逐日测试转殖率，以预培养7日之培植体表现最佳；培植体於转殖前4小时至转殖后24小时以高渗透压培养基处理，有助於转殖效率之提高；比较金、钨粒子对转殖率在转殖后48h並无不同，但转殖后120 h取样，则金粒子组有较高之蓝点数；钨粒子用量可减少至1/3標准用量对转殖率並无影响；利用基因鎗在使用1， 100 psi裂碟片、大载片至挡片之距离为4 mm、微载髁至射击目標之飞行距离6或9 cm之设定，GUS基因表现之平均蓝点数均可达15~20个／培植体。

Compared with non-nanopolyaniline synthesized by conventional emulsion polymerization, nanopolyaniline has the narrow and uniform distribution of particle dimension and the diameter of particle is about 4-5nm,and the conductivity reaches 3.2S·cm-1, which is more than 100 times higher than that of nanopolyaniline;Moreover, it has higher solubility in conventional solvent and the solubility reaches 95% in N-methyl pyrrolidone;what's more ,it has higher crystallinity and more uniform crystal proved by XRD, apparent blue shift indicated by UV, which makes it possible to prepare transparent conductive composite films.

结果表明，微乳液法合成的纳米聚苯胺与常规乳液法合成的非纳米聚苯胺相比，具有明显的优越性：粒径分布窄，95%的在10nm 以下，最大的不超过30nm；电导率较高，达到了3.2S/cm，提高了2 个数量级以上；在有机溶剂中的溶解度较高，其中在N-甲基吡咯烷酮中的溶解率达到了95%；X 射线衍射仪分析表明，纳米聚苯胺结晶度高，晶型更为规整；紫外可见光谱研究发现，纳米聚苯胺在可见光区有明显的蓝移，为制备透明的导电复合膜提供了可能。

As consequence of agglomeration, the particle size was much larger than 2μm though; when adding solution of 0.5% SLS to redisperse the solid systems, the particle could retain stable in size from 30mins to 90mins following drying and reach smaller size of 500nm~2μm in most experimental groups.

因为冻乾后粒子彼此凝集的关系，许多固化系统的粒径皆大於2μm，而当以0.5% sodium lauryl sulfate溶液进行分散，粒径可以在冻乾后30分钟到90分钟维持稳定以及在许多实验组中维持在500nm~2μm的粒径范围内。

The various trends in the POC/234Th ratio versus particle size were observed,which may be explained by a combination of 234Th decay and the preferential remineralization of POC relative to Th during particle aggregation.

本研究首先评估234Th示踪颗粒输出通量的方法，这包括不同采样方法(CTD瓶采与大体积泵采)对POC和颗粒态234Th结果的影响、POC/234Th随颗粒物粒径变化的主要原因。

Firstly, the specific surface area of nano-coated particle is much larger than that of ordinary wollastonite, and the edges formed in comminuting is passivated, which made the slippy crystal surface coarsened. At the same time, the color of nano-coated particle became whiter, which fit for light ware. Secondly, if the coated wollastonite hasn't been modified by coupling agent, the toughness of PP/ wollastonite composite couldn't be improved.

在硅灰石表面包覆上纳米级SiO2小颗粒对硅灰石的应用特性有重要影响：①纳米包覆粒子填料的比表面积比普通硅灰石大，纳米级SiO2小颗粒钝化了由于机械力粉碎造成的硅灰石的棱角，使其平滑的晶体解理面变得粗糙，同时硅灰石粉体白度增大，可应用于浅色制品。

Then, from the solid—liquid two phase flow theory, considering all the forces acted on the solid particle, the movement equations of single spheric particle are established.

然后，从固液两相流理论出发，导出单个球形泥沙颗粒的运动方程，由此建立泥沙颗粒的随机运动模型。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。