Measurement of the argon-gas-induced broadening and line shifting of the barium Rydberg level 6s24d 1D2 by two-photon resonant nondegenerate four-wave mixing

We apply two-photon resonant nondegenerate four-wave mixing with a resonant intermediate state to the obser-vation of the broadening and shifting of the barium Rydberg level 6s24d 1^D2 by collision with argon. The collision broadening and shifting cross sections are measured. This technique is purely optical, and can investigate the pressure dependence of the transverse relaxation rate-P21 between the Rydberg state and an intermediate state, as well as the transverse relaxation rate F20 between the Rydberg state and the ground state.     

热-电驱动喷射压缩复合制冷循环特性研究

自复叠制冷循环具有获得制冷温度低优点,但其完全消耗的是高品位电能或机械能;喷射制冷具有利用低品位低温热源(60~100℃)制取冷量、且制冷温度较高时制冷效率高等优点,但难以获得较低制冷温度。因此,为了实现低品位热在低温冷冻领域高效利用并节省高品位电能,本文提出一种由低品位低温热源与电能联合驱动的混合工质喷射/压缩复合制冷循环。建立组成新循环各部件热力学数学模型,分析喷射器压缩比和压缩机压缩比对复合式制冷循环的热性能系数和机械性能系数影响,并与传统的自复叠制冷循环特性进行比较分析。研究表明,低品位热源与电能联合驱动喷射/压缩复合制冷循环较传统I刍复叠制冷循环可显著提高制冷效率并获得更低制冷温度。     

L-R两步欧拉方法在铝材料微喷射中的应用

应用三维弹塑性流体力学Lagrangian-Remapping两步欧拉计算方法对铝材料微喷射现象进行了数值模拟研究。计算了Asay实验中表面刻有相同深度、不同夹角沟槽的金属铝微喷射模型,计算得到的微喷物总质量、最大射流速度和实验结果均符合较好。进一步展开了对相同深度、更大夹角范围沟槽微喷射的数值模拟。分析认为喷射最大速度随沟槽角度的增大呈线性下降趋势。同时给出了喷射系数随沟槽角度的变化的拟合关系曲线,看到由于材料强度及沟槽角度变化后造成的波系关系变化的影响,随着沟槽角度增加,喷射系数曲线呈明显非线性发展。     

离子液体对氩气介质阻挡放电光谱的影响

采用自行设计的介质阻挡放电反应器,以氩气和离子液体为放电介质,实现大气压下稳定的气(等离子体)-液(离子液体)等离子体放电,并运用光谱法在线诊断氩等离子体光谱。考察了不同咪唑基离子液体以及放电参数对大气压氩气介质阻挡放电光谱的影响。结果表明,离子液体的引入降低了氩气放电光谱的强度,谱峰强度与离子液体阳离子咪唑环上的碳链长度有关,且随碳链长度增加,谱峰强度降低;同时阴离子结构对称性低的离子液体,谱峰强度较低。加入离子液体后氩谱随放电电压及放电频率变化均呈现峰值变化。     

强脉冲X光辐照硬铝靶产生喷射冲量的研究

采用直接测量特定时间间隔系列和变磁阻传感技术的探头原理,实测了强脉冲X光辐照硬铝靶产生的喷射冲量。并给出了解析计算。结果表明,喷射冲量的计算值与实测值是基本符合的。     

变截面超音速汽液两相流升压过程的研究

本文针对超音速汽液两相流在变截面通道中的升压过程进行了实验研究,得到了变截面混合腔中超音速汽液两相流的压力变化规律,通过实验结果的分析得出了变截面混合腔中的渐缩部分的压力分布与出口压力无关、变截面通道的渐扩部分为一个单相流体扩压管、压力突变发生在变截面混合腔喉部和随着出口压力升高而激波强度增大、变截面超音速汽液两相流升压技术具有定流量特征等结论。     

Degenerate Four-Wave Mixing in SO2 in Free Jets

A rotational excitation spectrum of SO2 [^-A^1A2(511)←^-X^1A1(000)] at about 33331cm^-1 in free jets was observed by using the forward degenerate four-wave mixing (DFWM).Twelve lines of the G band and 11 ones of the E band were marked based on the rotational constants according to Hamada‘s result [Can.J.Phys.53(1975)2555].The relation between the DFWM signal intensity and the pressure of the buffer gas in free-jets was experimentally investigated.     

T型混合反应器内共沉淀法制备吡啶硫酮铜

在T型混合反应器内通过喷射共沉淀方法合成了吡啶硫酮铜(CPT).利用扫描电镜和小角度光散射实验手段研究了分散液中吡啶硫酮铜的形貌和大小。通过喷射共沉淀方法获得的初级吡啶硫酮铜颗粒为棒状, 在分散液中这些棒状颗粒易发生团聚, 形成分形维数为2.1的团聚体。用平均回转半径(R_g)表征分散液中团聚体的平均大小, 考察了反应温度和反应物化学计量比(吡啶硫酮钠/硫酸铜)对团聚体大小的影响, 随着反应温度的降低, 团聚体的回转半径逐渐减小;过量的吡啶硫酮钠也有利于降低团聚体的大小, 当吡啶硫酮钠过量量达到~25%时, 进一步增大吡啶硫酮钠的过量量, 团聚体的回转半径不再发生明显变化。     

氩气回路中甲烷和二氧化碳杂质的分析方法研究

本文1：1地模拟了正在建造的中国实验快中子反应堆的气体回路，建立了一个工程上可行的、50m长的、有多条固定管线和阀门的快堆覆盖气体放射性氩气取样系统、计算机控制的阀门进样以及氩气中杂质CH4和CO2的间断性在线分析方法。通过热导检测器出口气体可以排放入通风系统的办法，避免了使用氢火焰离子化检测器以后，放射性气体氩气扩散排放到气体分析实验室产生工作环境的放射性污染问题。其检出限、测量精度和准确度满足了中国实验快堆规定的氩气中杂质CH4和CO2的分析要求。并达到了美国试验和材料协会（ASTM）在快堆覆盖气体杂质的标准中提出的分析氩气中杂质CH4和CO2的标准。     

对当量为1的预混乙烯/氧气/氩气火焰的实验研究

A comprehensive experimental study of the premixed ethylene/oxygen/argon flame at 2.667 kPa with a stoichiometric equivalence ratio (φ=1) was performed with the tunable synchrotron photoionization and molecular-beam sampling mass spectrometry techniques. The isomers of most observed species in the flame were unambiguously identified by measurements of the photoionization efficiency spectra, e.g. C3H4, C2H4O and C4H4. The mole fraction profiles of species up to C7H8 were measured by scanning the burner position at the selected photon energies near ionization thresholds, and the flame temperature profile was obtained by using Pt/Pt-13%Rh thermocouple. Compared with the previous studies, a lot of new flame species:C3H2, C3H3, C3H5, C2H6O, C4H2, C4H4, C4H6, C3H4O, C3H6O, C3H8O, C5H6, C4H8O and C7H8, were observed. A series of free radicals in the flame are detected to be CH3, C2H3, C2H5, HCO, C3H3 and C3H5.Based on the experimental work, a reduced reaction mechanism was developed including 40 species and 223 reactions. Modeling and measurements agree well for the major species and most intermediates. A detailed kinetic model is desired for this flame.