用气相色谱法测定钢瓶内液化石油气中二甲醚含量

为了解决快速、准确测定液化石油气中二甲醚含量的问题，本文旨在提出用气相色谱法测定液化石油气中二甲醚含量的方法。用填充柱气相色谱法测定液化石油气中二甲醚的添加量。柱长10m×4mm，热导池检测器，氢气做载气，归一法计算样品中二甲醚含量。样品五次测定的相对标准偏差在1．3％～8．0％之间，检出限0．1％。     

Integrated interpretation of dual frequency induced polarization measurement based on wavelet analysis and metal factor methods

In mineral exploration, the apparent resistivity and apparent frequency (or apparent polarizability) parameters of induced polarization method are commonly utilized to describe the induced polarization anomaly. When the target geology structure is significantly complicated, these parameters would fail to reflect the nature of the anomaly source, and wrong conclusions may be obtained. A wavelet approach and a metal factor method were used to comprehensively interpret the induced polarization anomaly of complex geologic bodies in the Adi Bladia mine. Db5 wavelet basis was used to conduct two-scale decomposition and reconstruction, which effectively suppress the noise interference of greenschist facies regional metamorphism and magma intrusion, making energy concentrated and boundary problem unobservable. On the basis of that, the ore-induced anomaly was effectively extracted by the metal factor method.     

Electrochemical corrosion response of a precipitation hardening moulds steel in a NaCl solution

Investigations concerning the electrochemical corrosion behavior of mould steels are scarce and limited. In the present study, the corrosion resistance of a precipitation hardening moulds steel submitted to aging treatments has been assessed in a 0.1 M NaCl aqueous solution by means of potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The electrochemical characterization of the steel not submitted to hardening treatments was also examined and a comparative study was made between the different specimens. Scanning electron microscopy and electron probe microanalysis were used to obtain information about the morphology and chemical composition of the steels surface after the electrochemical tests. Increasing the aging temperature an increase of secondary hardness is observed, attributable to an increase of secondary phases (re‐precipitated carbides and metastable GP zones) amount, positively reflecting on the mechanical properties. However, the electrochemical results show a progressive worsening of the corrosion behavior, the as‐received steel sample exhibiting the best corrosion resistance. The observed decrease of corrosion resistance with increasing the aging temperature is ascribed to enhanced galvanic coupling phenomena between the secondary phases, acting as cathodes, and the surrounding matrix which, consequently, experiences preferential dissolution.     

Photodetachment of negative hydrogen ion in circularly polarized monochromatic and bichromatic laser fields

We theoretically have investigated the detachment of negative hydrogen ion in circularly polarized monochromatic and bichromatic laser fields by calculating the photoelectron momentum distributions (PMDs). We find that the PMDs are controlled by the electric field of laser pulse. For circularly polarized monochromatic laser fields, the PMDs are perfect and isotropic rings, and the photodetachment rates in random direction are same. For this case, the photoelectron momentum spectra directly reflect the electronic distributions of negative hydrogen ion. For circularly polarized bichromatic laser field, the PMDs are inversion asymmetric, but symmetric about a certain axis. The emission directions of the photoelectrons vary with the electric field shape, that is to say that the emission directions of the photoelectrons vary with the carrier-envelope (CE) phases, which decide the electric field of laser pulse. The maximal photodetachment rates and the spectra shape, however, are same for the different CE phases.     

土壤相对湿度与电容相关性探究

土壤相对湿度是农业自动化灌溉技术的关键性指标,也是当前农田领域研究的热点问题。为了探索土壤电容与土壤相对湿度的相关性,设计了一种测量土壤电容值的方法,通过烘干法对不同湿度点进行了较为精准的电容值检测,最后通过matlab7.1作数据拟合。结果表明,土壤电容值与土壤相对湿度在30%-100%之间存在很好的对数关系,考虑温度补偿,得到任意温度t的湿度t=(17.53ln Cx-5.773)*(100+0.05075*(20-t))%,判定系数R2=0.975。     

Conceptual design and infrastructure for the installation of the first AGATA sub-array at LNL

The first implementation of the AGATA spectrometer consisting of five triple germanium detector clusters has been installed at Laboratori Nazionali di Legnaro, INFN. This setup has two major goals, the first one is to validate the γ-tracking concept and the second is to perform an experimental physics program using the stable beams delivered by the Tandem-PIAVE-ALPI accelerator complex. A large variety of physics topics will be addressed during this campaign, aiming to investigate both neutron and proton-rich nuclei. The setup has been designed to be coupled with the large-acceptance magnetic-spectrometer PRISMA. Therefore, the in-beam prompt γ rays detected with AGATA will be measured in coincidence with the products of multinucleon-transfer and deep-inelastic reactions measured by PRISMA. Moreover, the setup is versatile enough to host ancillary detectors, including the heavy-ion detector DANTE, the γ-ray detector array HELENA, the Cologne plunger for lifetime measurements and the Si-pad telescope TRACE. In this paper the design, characteristics and performance figures of the setup will be described.     

短波红外纳米PbSe薄膜制备及光电性能研究

采用化学沉淀的方法在石英衬底上制备了短波红外纳米PbSe薄膜.XRD,SEM,TEM以及红外透射光谱测试分析结果表明,所制备的PbSe薄膜为纳米多晶薄膜,表面平整致密,薄膜的晶粒尺寸为10 nm左右,由于量子效应,薄膜吸收截止边相对PbSe体材料蓝移至1.6 μm；经过敏化、光刻及金属化制备了PbSe单元光导探测器,在...     

Evaluating electrochemical behaviour of recrystallized titanium alloys in Ringer's solution

By anodic potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques, the effect of recrystallization on the corrosion and electrochemical behaviour of Ti12Mo and Ti12Mo5Ta alloys was studied. Aerated Ringer's solution was employed as electrolyte solution at 37 °C. The pH was 6.9 and adjusted to 2.5 simulating the disease state. The results show excellent corrosion resistance for recrystallized Ti12Mo and Ti12Mo5Ta alloys, corroborated by high values of polarization resistance and low values of passive current density. Recrystallized structure rendered the Ti12Mo and Ti12Mo5Ta alloys extremely corrosion resistant.     

激光料位探尺在气烧石灰竖窑中的应用

介绍了手动探尺和激光料位探尺探测料位的优缺点，改进并应用了激光料位探尺，完善了工艺操作，并取得了良好的使用效果。