退火工艺对ICF靶用冷轧镍膜的影响

 为了满足惯性约束聚变（ICF）和状态方程（EOS）实验以及靶装配工艺的需要,在薄膜轧制过程中间以及轧制工艺完成以后需要对镍膜进行热处理来改善其组织结构和力学性能。对多辊轧机冷轧的方法制备的厚11 mm镍膜中间退火工艺进行了研究,根据确定的合适的退火工艺退火后继续轧制得到成品镍膜厚7 mm,表面粗糙度小于50 nm,基本满足目前状态方程实验对箔膜的要求。金相显微照片表明镍膜晶粒经500 ℃保温1 h退火由轧制前的条带状变为等轴晶;镍膜硬度经500 ℃退火后由4 GPa降低到了2.3 GPa左右;XRD衍射测试表明镍膜经500 ℃以上温度退火后,高角度的衍射峰开始出现,织构得到一定程度的改善。由此可以确定镍膜合适的中间退火温度为520 ℃保温1 h。     

利用锁相探测技术探测铯冷原子荧光谱的实验研究

通过俘获光频率调制,实现了铯冷原子荧光的锁相探测,得到了荧光谱信噪比改善52倍的结果.研究了锁相解调参量与荧光谱信噪比的关系;当灵敏度为1 mV和时间常量为1 s时,获得最大信噪比为204的荧光信号.     

低温过冷测试平台冷压缩机性能的测试研究

冷压缩机具有工作温度低、尺寸小、功耗低、便于操控等特点,是大型过冷氦低温系统中的关键设备。对低温过冷测试平台的冷压缩机进行测试,方法为采用两台串联的冷压缩机在低温低压下直接抽吸饱和液氦容器,液氦容器内装有电加热器用以模拟超导磁体的热负荷,并调节氦气蒸发速率。测试表明,冷压缩机的稳定工作参数接近设计值,运行过程中冷压缩机始终保持安全运行,未出现喘振情况,液氦容器温度和压力分别达到3 K、22 kPa,满足设计要求。     

等离子体填充耦合腔链特性研究

 用严格的场匹配方法分析了填充等离子体的耦合腔链，研究了等离子体 腔混合模的形成以及“冷带宽”和“热带宽”的展宽效应。等离子体填充周期性耦合腔链后，形成周期性的截止频率为0的等离子体TG模式。当填充的等离子体密度较大，且腔模和TG模式发生部分重叠时，两者相互耦合，形成等离子体 腔混合模式。工作在混合模式下，其“冷带宽”和“热带宽”大大增宽，且耦合阻抗比真空时提高了近5倍，因此在填充等离子体后，耦合腔链的慢波特性得到了显著的改善。     

Phenomena of the Cold Pulse Propagation during Pulsed Molecular Beam Injection

As an advanced fuelling method on tokamak, molecular beam injection （MBI） has successfully been developed in HL-1M firstly and applied to HL-2A later. Many advantages such as peaked density profile and the energy confinement time increasing have been found in the MBI experiments. Some interesting phenomena have been observed in the previous MBI experiments. But up to now the mechanism of the MBI seems not very clear.     

微波消化-连续流动进样冷原子吸收法测定中成药中痕量汞

本实验室建立了用微波消化系统，消化中成药样品，用连续流动进样冷原子吸收法测定了中成药中痕量汞的方法。研究了硝酸－过氧化氢和硝酸－硫酸－高氯酸两种不同混合酸的消化体系及消化时间和压力对测定结果的影响。方法的相对标准偏差为４．９％，回收率在９１％—１１６％之间，检出限为０．１５ｎｇ／ｍＬ。     

Investigation on Interaction between Cold Plasma with Catalysts

The characteristic parameters were measured with floating double probe method when cold plasma was interacting with catalysts,such as MoO3/Al2O3,NiY,Pd/Al2O3,which were used in the conversion of natural gas to C2 hydrocabons through electrical field enhanced plasma catalysis.These parameters were compared in different input voltage,different atmosphere,before and after reaction in plasma field.The interaction between catalysts and cold plasma was also investigated.This confirm that cold plasma can enhanced catalysis effect.     

Determination of mercury in saliva with a flow-injection system

A simple, fast and reliable method, with a low detection limit, has been developed for the determination of total mercury in saliva samples. The method uses a brominating reagent, followed by on-line addition of KMnO₄ at room temperature to convert organically bound mercury to inorganic mercury ions, and determines mercury by flow-injection cold-vapour atomic absorption spectrometry. Using the method described, complete recoveries of five mercury compounds from saliva were attained. Results obtained on real samples using the new method were comparable to that obtained using the established method with batch system. The detection limit of this method, based on three standard deviations of the blank, is 0.05 μg l⁻¹ Hg in a saliva sample of 500 μl. A sample throughput of 80 measurements per hour is possible with the method. The calibration curves are linear up to 20 μg l⁻¹ and the dynamic range extends to 40 μg l⁻¹ Hg. At a concentration of 1μg l⁻¹ mercury in saliva, the relative standard deviation is about 2% for 11 replicates; a total volume of 0.5 ml saliva is required for three replicates.     

Evaluation of 3,5-stigmastadiene content of edible oils: Comparison between the traditional capillary gas chromatographic method and the on-line high performance liquid chromatography-capillary gas chromatographic analysis

Summary The quantitation of 3,5-stigmastadiene and other steroidal hydrocarbons, commonly known as steradienes, is a valid tool for the recognition of refining (in particular bleaching) of edible oils; the evidence of this process is nowadays of a great interest due to growing market for virgin, cold-pressed, natural oils. Due to the long time required (about 4 hours) and the amount of solvents employed (about 650 mL) to perform the official analysis, other methods have been recently proposed, the most important of which involves high performance liquid chromatography coupled with capillary gas chromatography (HPLC-GC). In this study the results of ten oil samples, analysed by both the official method and HPLC-GC, are reported and the two methods compared and discussed, for routine use, in terms of sample preparation, time of analysis and setting up, difficulty and reproducibility.