Vol.21,

Bunch charge uniformity controlling is very important for top-up operation of the storage ring. In order to monitor filling pattern and measure the bunch charge precisely, a PXI waveform digitizer-based data acquisition system has been developed to retrieve bunch charge information from BPM pickup signals. An effective sampling rate is extended to 400 GHz by waveform rebuilding technology, which overlays multi-turn data into single turn with real time sampling rate of 8 GHz. An on-line evaluation indicates that resolution and linearity of the charge measurement are better than 0.5% at input range of 0.5–12 nC.

541

To investigate the characteristic and sources of the fine particulate matter (PM_2.5), and the major sources affecting particulate air pollution in Shanghai, China, the individual aerosol particles were analyzed using the synchrotron radiation micro-beam X-ray fluorescence analysis (μ-SXRF), and the PM_2.5 multi-elements were determined by the inductively coupled plasma mass spectrometer (ICP-MS). The results show that the mass concentration and chemical elements have seasonal variation, and the enrichment factors show that the chemical elements in the inhalable particles could come from the earth crust and anthropogenic pollution. The extent of metal pollution was assessed by comparing the measured concentrations with those reported in the literature. Nine categories of PM_2.5 pollution sources identified at the center of Shanghai show that the vehicle exhaust, emission of metallurgic industry and coal combustion are important.

408

In this paper, the equivalent radius of radioactive sources in each segment is determined by analyzing the different responses of the two identical detectors, and an improved segmented gamma scanning is used to assay waste drums containing mainly organic materials, and proved by an established simulation model. The simulated radioactivity distributions in homogenous waste drum and an experimental heterogeneous waste drum were compared with those of traditional segmented gamma scanning. The results show that our method is good in performance and can be used for analyzing the waste drums.

397

The terahertz time-domain spectroscopy (THz-TDS) was used for sensing and identifying illicit drugs. The absorption spectra of seven illicit drug samples (morphine and its hydrochloride, cocaine hydrochloride, codeine phosphate, papaverine hydrochloride, pethidine hydrochloride, and thebaine) were studied by THz-TDS at 0.3–2.0 THz at room temperature. The geometric structure and vibration frequencies of morphine were calculated by density functional theory. The four absorption features were dominated by intra-/inter-molecular collective or lattice vibration modes. Each illicit drug has a distinct signature in its THz spectra. The results indicate that the THz-TDS can be used to identify and discriminate illicit drugs by their characteristic fingerprints.

506

In order to extract the information of 662-keV ¹³⁷Cs spectra from the overlapping peaks with 583-keV ²⁰⁸Tl, 609-keV ²¹⁴Bi, the overlapping peaks are measured by in-situ γ-ray spectrometer using a NaI(Tl) detector. The spectral model is optimized by the Gaussian fitting algorithm, and the optimized fitting indexes for fitting/original value are from 0.96 to 0.99. Gaussian fitting verified by experiment is feasible for γ-ray spectrum analysis. The full energy peak of ¹³⁷Cs is extracted correctly from the overlapping peaks, it is important for in-situ γ-ray spectrometer to estimate contamination of ¹³⁷Cs in radiated environment and nuclear accident.

540

In India, bricks as building materials are mainly prepared by clay using the deposited sediments of rivers, and the radionuclide contents in bricks and brick-making clays should vary with origin and geological condition. In this paper, the radionuclide contents of these materials from river bank areas of Cuddalore district, Tamilnadu India are measured by gamma ray spectrometer using NaI(Tl) detector, and compared with those of other countries. The radiation hazard indices, which are evaluated by radium-equivalent (Ra_eq) activity, are lower than that of NEA-OECD.

490

450

To search for certain signature proteins and the expression profiles in lacrimal passage stenosis, rabbit models of lacrimal passage stenosis were treated by ¹²⁵I seed brachytherapy. All the signature proteins were separated by two-dimensional electrophoresis, and identified by mass spectrometry. The results show that the up-regulated proteins are peptidyl-prolyl cis-trans isomerase A (PPIase A), and epidermal fatty acid-binding protein (E-FABP), while the down-regulated proteins are myosin light chain 1(isomer of skeletal muscle), myosin light polypeptide 6 (isomer 1 of smooth muscle and non-muscle), myosin light chain 1(isomer of slow-twitch muscle A), isomer 2 of ERC protein 2, and α-crystallin family protein. The proteins may play a role in healing the wound and regulating synaptic active zone of neurons due to correlation to cell apoptosis, proliferation and migration of smooth muscle cell. These provide molecular mechanism for preventing stenosis and restenosis of lacrimal passage.

560

465

Charge stripping is employed to produce multi-charged ions for injecting the cooling storage ring. After penetrating through the carbon foil, the widened distribution of ion charge states poses a limit to the ion injection. Therefore, the carbon foil plays a key role in the charge stripping injection. In this paper, four strippers for Heavy Ion Research Facility at Lanzhou (HIRFL) and Cooling Storage Ring (CSR) are introduced. The charge state distribution of the stripped ions is measured and the stripping efficiency of the foils is investigated. The experimental results are consistent with the theoretical values.

534

The heat transfer coefficient is very low at bulk temperatures higher than the pseudo-critical point, because the supercritical pressure leads to a vapor-like fluid. In this paper, the heat transfer downstream an obstacle-bearing vertical tube is simulated by the CFD code of Fluent 6.1, using an adaptive grid in the supercritical condition. The reliable results are obtained by the RNG k-ε model using the enhanced wall treatment. The blockage ratio and local temperature of obstacle affect greatly the heat transfer enhancement, and the resultant influence region and decay trend are compared with the existing equations.

485

527

In this study, the severe accident progression analysis of generic Canadian deuterium uranium reactor 6 was preliminarily provided using an integrated severe accident analysis code. The selected accident sequences were multiple steam generator tube rupture and large break loss-of-coolant accidents because these led to severe core damage with an assumed unavailability for several critical safety systems. The progressions of severe accident included a set of failed safety systems normally operated at full power, and initiative events led to primary heat transport system inventory blow-down or boil off. The core heat-up and melting, steam generator response, fuel channel and calandria vessel failure were analyzed. The results showed that the progression of a severe core damage accident induced by steam generator tube rupture or large break loss-of-coolant accidents in a CANDU reactor was slow due to heat sinks in the calandria vessel and vault.

496