摘要：本文介绍了BESIII离线数据处理软件系统的构成以及数据处理的主要流程;给出了利用工具软件TAU(Tuning and Analysis Utilities)对系统性能进行的测试结果,据此结果估算了BESIII实验所需的计算资源,并且与BESIII设计报告的相关部分进行比较,说明了BESIII计算机环境的设计基本满足BESIII离线数据处理的要求。

摘要：目的比较水砷快速检测试剂盒(速测法)和氢化物发生-原子荧光光谱法(HG-AFS)测定饮水中砷含量的可靠性和应用价值。方法用速测法和HG-AFS测定水样747份,将2种方法检测结果进行对比,数据处理应用SPSS10.0软件进行配对设计的秩和检验。结果2种方法测得的结果总体差异无统计学意义(u=1.32,P>0.05),但速测法结果在0.03～0.05mg/L之间与HG-AFS结果差异有统计学意义(u=2.42,P<0.05)。结论HG-AFS稳定可靠,速测法操作简单,可以在现场应用。用速测法初步筛选,用HG-AFS对速测法结果含砷定量分析,既可减少工作量,又能保证分析结果的可靠性,完全能满足地方性砷中毒工作的需求。

摘要：城市道路施工易引发交通拥堵,从而导致机动车在低速与怠速工况下行驶会消耗更多的燃油,使得机动车尾气污染物排放量显著上升。以低排为目标,实现区域交通的道路组织优化,针对施工区域及其上下游交叉口的交通运行特性和拥堵成因,从区域组织分流与信号配时优化等角度设计优化方案。将微观仿真软件VISSIM与MOVES排放模型相结合,测算优化前后机动车尾气污染物的排放量,并以济南市长清区文汇路施工项目为背景,对道路优化方案减排的有效性和车辆延误的改善效果进行评估分析。研究结果表明:与现状方案相比,各优化方案均在不同程度上有针对性地减少了施工区域及其上下游交叉口行驶机动车的延误时间,其中信号配时优化+分流10%方案在减少机动车尾气污染物排放总量方面更具优势,该方案下城市交通3类主要车型的尾气污染物排放量显著降低。

摘要：基于卡尔曼滤波方法,开发了漂移室径迹拟合算法。在软件中仔细处理多次散射、能量损失等物质效应,处理磁场不均匀性的影响,考虑重力下垂、单丝空间分辨和其他刻度因素。描述了漂移室径迹拟合软件包的设计实现、主要算法,并用模拟样本对算法及其相关参数进行了优化。对其性能进行的研究表明,拟合结果的各种分布是合理的,本软件对径迹参数、误差矩阵以及动量分辨率都有所改善,对低动量的强子径迹更为明显,从而对BESⅢ物理结果有较为显著的影响。

摘要：The Accelerator Driven Sub-critical(ADS)system is a strategic plan to solve the nuclear waste problem for nuclear power plants in ***-energy particle accelerators and colliders contain long strings of superconducting devices,superconducting radio frequency cavities,and magnets,which may require cooling by 2 K superfluid helium(HeliumⅡ).2 K superfluid helium cryogenic system has become a research hot spot in the field of superconducting *** this study,the ADS Injector-I 2 K cryogenic system is examined in *** cryogenic system scheme design,key equipment,and technology design,such as the 2 K Joule–Thomson(J–T)heat exchanger and cryomodules CM1+CM2 design,are examined,in addition to the commissioning and operation of the cryogenic *** ADS Injector-I 2 K cryogenic system is the first 100 W superfluid helium system designed and built independently in *** ADS proton beam reached 10 Me V at 10 m A in July 2016 and 10 Me V at 2 m A in continuous mode in January 2017 and has been operated reliably for over 15,000 h,proving that the design of ADS Injector-I 2 K cryogenic system,the key equipment,and technology research are reasonable,reliable,and meet the *** research into key technologies provides valuable engineering experience that can be helpful for future projects such as CI-ADS(China Initiative Accelerator-Driven System),SHINE(Shanghai High Repetition Rate XFEL and Extreme Light Facility),PAPS(Platform of Advanced Photon Source Technology),and CEPC(Circular Electron-Positron Collider),thereby developing national expertise in the field of superfluid helium cryogenic systems.

摘要：In order to develop efficient photocatalysts,great efforts have been made to reduce hexavalent chromium to trivalent *** photocatalytic efficiency of this reduction depends largely on the adsorption and diffusion of hexavalent chromium ions on the surface of the *** this paper,polyanilineTiO2 composite can effectively improve the photocatalytic reduction performance and stability of hexavalent chromium *** effect of polyaniline(PANI) thickness on Cr(VI) activity and stability of photocatalytic reduction was studied by adjusting the content of PANI on Mesoporous TiO2(MT) *** the irradiation conditions,the reaction results showed that the reduction rate was 100%,and the maximum reaction rate reached 0.62 min-1 when the PANI modification was 3.0%.Moreover,the results showed that the reduction performance remained 100% after ten *** main reason is that the PANI modified on the surface of TiO2 is rich in positively charged amino group,which can efficiently adsorb the reactant Cr(VI),and make the product Cr(III) leave the reaction interface quickly,thus ensuring the performance of photocatalyst.

摘要：The current measuring methods of walkability,such as the walk score,consider that walking distance decay laws for all amenities are the same,which is not applicable to typical communities in China with plentiful ***,the walking distance decay laws of multi-type and multi-scale facilities are ***,based on the residents'amenity selection survey,the walking distance decay law of residents'choice of amenity was studied from three aspects,including the law of all amenities,the laws of different types of amenities and the laws of different scales of *** was proved that the walking distance decay laws of different kinds of amenities showed a significant ***,different amenities'acceptable walking distance and optimum walking distance were obtained according to previous studies and the decay *** with higher attraction and/or a larger scale showed a longer acceptable walking distance and optimum walking ***,the binary logistic model was used to describe the relationships between walking distance,amenity type,amenity scale and the probability of one amenity being selected,the prediction accuracy of which reached 80.4%.The calculated probability obtained from the model can be used as the decay coefficient of amenities in the measurement of walkability,providing a reference for the site selection and evaluation of amenities.

摘要：为了评估多爆炸成型弹丸设计参数对智能雷毁伤目标效能的影响,利用有限元软件模拟了多爆炸成型弹丸的形成过程.在建立了智能雷多爆炸成型弹丸战斗部辐射毁伤模型的基础上,运用计算机进行数值仿真,分析了在多爆炸成型弹丸设计参数影响下智能雷对坦克目标的毁伤概率.结果表明,进行战斗部设计时需要优化处理多爆炸成型弹丸的设计参数,才能提高智能雷毁伤概率.

摘要：随着万维网和在线社交网站的发展,规模大、结构复杂、动态性强的大规模网络应用而生.发现这些网络的潜在结构,是分析和理解网络数据的基本途径.概率模型以其灵活的建模和解释能力、坚实的理论框架成为各领域研究网络结构发现任务的有效工具,但该类方法存在计算瓶颈.近几年出现了一些基于概率模型的大规模网络结构发现方法,主要从网络表示、结构假设、参数求解这3个方面解决计算问题.按照模型参数求解策略将已有方法归为两类:随机变分推理(stochastic variational inference)方法和在线EM(online expectation maximazation)方法,详细分析各方法的设计动机、原理和优缺点.定性和定量地对比、分析典型方法的特点和性能,并提出大规模网络结构发现模型的设计原则.最后,概括该领域研究的核心问题,展望未来发展趋势.

摘要：本文主要探究半柱面照度指标用于指导游泳馆场地照明的方法,并提出了采用半柱面照度指标进行有HDTV转播时的游泳馆场地照明设计的设计检测标准。