OMAPL138双核系统的调试方案设计

OMAPL138高性能、低功耗双核处理器为手持式移动设备提供强有力的支持。对双核通信模块DSPLink的软件架构和在Linux嵌入式操作系统下的编译加载进行了分析和介绍,以消息队列组件为例分析了ARM和DSP双核通信时通道的建立和连接的方式。通过DSP／BIOS和Linux端DSPLink的MSGQ接口和多线程技术,建立ARM和DSP消息传递通道,提供了在双核开发中对DSP端暗箱调试的解决方法。     

138Cs半衰期的测定

138Cs是测定核燃料裂变燃耗用的重要核素,但其半衰期的文献值差异很大.详细阐述了用阱式HPGe探测器质量接续法和双HPGe探测器位置接续法测定138Cs半衰期的原理和过程,最后测定结果为32.17士0.07min.     

Three years of monitoring of PCDD/F,DL-PCB and NDL-PCB residues in bovine milk from Lombardy and Emilia Romagna regions (Italy): Contamination levels and human exposure assessment

In the three-years period 2012–2014, 160 cow milk samples from farms located in Lombardy and Emilia Romagna regions (Italy) were analyzed during the implementation of the Italian National Residues Monitoring Plan to assess the presence of PCDD/F, DL-PCB and NDL-PCB residues. The obtained contamination data were combined with cow milk consumption data from the Italian national dietary survey to estimate PCDD/F, DL-PCB and NDL-PCB human dietary exposure through the consumption of whole, semi skimmed and skimmed bovine milk. The exposure assessment was carried out separately for children, teenagers, adults and elderly. Average contamination levels of the analyzed samples were found to be 1.26 pg WHO-TEQ/g fat for the sum of PCDD/Fs and DL-PCBs and 9.30 ng/g fat for the sum of the 6 NDL-PCB indicators. PCB 126 was found to be the main contributor to the total WHO-TEQ. Using the upper bound approach, the estimated mean dietary intakes ranged from 0.07 pg WHO-TEQ/kg bw per day to 0.39 pg WHO-TEQ/kg bw per day for the sum of PCDD/Fs and DL-PCBs and considering exposure from whole milk. NDL-PCB mean dietary intakes resulted between 0.52 ng/kg bw per day and 2.86 ng/kg bw per day for consumption of whole milk. Children and teenagers were found to be the most exposed groups. This is the first time that Italian consumers exposure to NDL-PCBs is assessed using contamination data of cow milk produced in Italy.     

基于OMAP-L138平台多通道手持频谱分析仪研究

针对部分特殊场合对频谱分析仪使用需要多通道、便携等需求,设计了一种通道数最多支持64通道的手持多通道频谱分析仪。该频谱分析仪以美国德州仪器公司推出的DSP＋ARM双核CPU芯片OMAP—L138为平台,采用多通道A／D转换器进行数据采集,使用QT开发GUI界面对系统进行控制和数据显示,能实现频谱分析、失真测量、信号采集、多通道数据对比分析等功能。测试结果表明：本设计能完成信号采集及频谱分析功能,并拥有较小的采集频率误差,误差值≤1％。     

Production of hydrogen by unmixed steam reforming of methane

Unmixed steam reforming is an alternative method of catalytic steam reforming that uses separate air and fuel–steam feeds, producing a reformate high in H₂ content using a single reactor and a variety of fuels. It claims insensitivity to carbon formation and can operate autothermally. The high H₂ content is achieved by in situ N₂ separation from the air using an oxygen transfer material (OTM), and by CO₂ capture using a solid sorbent. The OTM and CO₂ sorbent are regenerated during the fuel–steam feed and the air feed, respectively, within the same reactor. This paper describes the steps taken to choose a suitable CO₂-sorbent material for this process when using methane fuel with the help of microreactor tests, and the study of the carbonation efficiency and regeneration ability of the materials tested. Elemental balances from bench scale experiments using the best OTM in the absence of the CO₂ sorbent allow identifying the sequence of the chemical reaction mechanism. The effect of reactor temperature between 600 and on the process outputs is investigated. Temperatures of 600 and under the fuel–steam feed were each found to offer a different set of desirable outputs. Two stages during the fuel–steam feed were characterised by a different set of global reactions, an initial stage where the OTM is reduced directly by methane, and indirectly by hydrogen produced by methane thermal decomposition, in the second stage, steam reforming takes over once sufficient OTM has been reduced. The implications of these stages on the process desirable outputs such as efficiency of reactants conversion, reformate gas quality, and transient effects are discussed.     

基于OMAPL138的视频监控烟雾检测系统

基于低功耗浮点DSP+ARM双核架构的高性能芯片OMAPL138,开发一个带烟雾检测功能的视频监控与处理系统。该系统利用Davinci异构多核通信的基础组件SysLink,实现了视频信号在异构多核处理器之间的通信与处理,具有体积小,功耗低,算法实现灵活高效,可以脱离计算机独立运行等特点。在OMAPL138的DSP端运行了基于图像频度特征的烟雾检测算法,综合运用频度图像和灰度图像相对于基准图的相关系数,既能检测浓烟也能检测稀薄烟雾,并利用烟雾的独有特征避免了物体移动与光照变化等场景引起的误检测。     

新型高磷铁矿反浮选捕收剂的研制及浮选性能评价

对高磷赤铁矿的反浮选降磷新型药剂RFP-138进行了系统的试验评价研究。胶磷矿和赤铁矿的单矿物及人工混合矿浮选试验结果证明RFP-138阴离子捕收剂是高磷赤铁矿的有效反浮选降磷药剂, 可以将磷含量从1.05%降至0.12%, 有效实现胶磷矿与赤铁矿的分离。     

强度平衡法测定138Csγ射线发射概率

短寿命裂变产物138Cs是测量裂变燃耗的重要核素,其半衰期为33.41min,经β-衰变到138Ba,共发射88条γ射线.根据母核衰变到子核基态上各种射线强度之和等于母核衰变活度的强度平衡法原理,用已标定好的峰效率曲线的HPGeγ谱仪准确测定了138Cs的γ射线发射概率,Pγ(1435.86keV)的测定结果为0.7599±0.0032.     

下调lncRNA LINC00176对肺癌A549/DDP细胞顺铂耐药和自噬的影响

目的：研究下调lncRNA LINC00176对肺癌A549/DDP细胞顺铂耐药和自噬的影响及机制。方法：qRT-PCR方法测定正常支气管上皮16HBE细胞和肺癌A549、A549/DDP、NCI-H1299、SK-MES-1细胞中LINC00176的表达。将A549/DDP细胞分成对照组、si-NC组、si-LINC00176组、si-LINC00176+Anti-miR-NC组、si-LINC00176+Anti-miR-138-5p组。MTT实验检测顺铂对A549/DDP的半数抑制浓度（IC50）。流式细胞术测定细胞凋亡。Western blot测定LC3-I、LC3-II、Beclin 1、C-Caspase-3蛋白表达。利用荧光素酶报告系统鉴定LINC00176和miR-138-5p的靶向关系。结果：与16HBE细胞比较，A549、A549/DDP、NCI-H1299、SK-MES-1细胞中LINC00176表达水平显著升高（P<0.01）。与A549细胞比较，A549/DDP细胞中LINC00176表达水平显著升高（P<0.01）。与对照组、si-NC组比较，si-LINC00176组A549/DDP细胞IC50显著降低（P<0.01），LC3-II/LC3-I、Beclin 1蛋白表达显著降低（P<0.01），凋亡率、C-Caspase-3蛋白表达、miR-138-5p表达水平显著升高（P<0.01）。LINC00176与miR-138-5p直接结合。与si-LINC00176+Anti-miR-NC组比较，si-LINC00176+Anti-miR-138-5p组A549/DDP细胞IC50显著升高（P<0.01），LC3-II/LC3-I、Beclin 1蛋白表达显著升高（P<0.01），凋亡率、C-Caspase-3蛋白表达显著降低（P<0.01）。 结论：下调lncRNA LINC00176通过靶向上调miR-138-5p能够抑制肺癌A549/DDP细胞顺铂耐药，抑制细胞自噬，诱导细胞凋亡。     

Development of a Device for Detecting Fuel Failure in a Pool-Type Reactor Effective Extraction of Fission Rare Gases by Introducing Gas Bubbles

Studies have been made for developing a sensitive device for monitoring possible release of fission products from fuel elements of a pool-type research reactor. Gas bubbles were introduced into the reactor-coolant water to extract dissolved fission rare gases, ⁸⁹Kr and ¹³⁸Xe, and their daughter nuclides, ⁸⁹Rb and ¹³⁸Cs, were counted with high efficiency. Various causes that influence the efficiency of extracting the rare gases and of collecting the daughter nuclides were studied by two methods: (1) a “filter method”, in which the air covering water was sucked and the daughter nuclides were caught onto a filter paper, and (2) a “bottle method”, in which the bubbled gas was sampled into a bottle, and the gas was later washed with water, and the activities on the filter or of the water were counted. The items affecting the efficiency of extraction include the flow rate of gas introduced, the position (the depth and the radial direction) of the gas exit in the reactor water, and whether the coolant was circulated or not. Analysis was made of the effect of the depth on the extraction efficiency of dissolved gas into bubbles. On the basis of these results, a fuel-monitoring device for routine use was tentatively designed, both in the filter and in the bottle methods, and tests were made. The filter method was found to be unsatisfactory for practical use. The bottle method enabled an automatic system which functions well enough to be used as a fuel-failure monitoring device.