摘要：目的开展农村饮水安全工程卫生学评价,及时发现供水工程在设计、建设、管理和运行阶段存在的卫生学风险。方法2022年6月通过资料收集与审查、现场调查与评价、水质评价、专家组会商等方式,对水源、工艺、水质、卫生管理等要素进行现场卫生学评价,并提出意见和建议。结果该工程目前实际供水规模为700 m3/d,覆盖4500人;近5年水厂覆盖范围内无传染病及地方病发病记录;水源选择、厂址选择及厂区布置、传染病及地方病史、水质及卫生管理符合供水工程卫生学要求;水厂氟化物、砷、总大肠菌群等31项指标检测结果均符合《生活饮用水卫生标准》(GB 5749—2006)要求。评价过程中发现工程未划定水源保护区且无警示标识,调节构筑物设施破损、有锈蚀,滤料和消毒剂的投加无详细的记录和操作规范,无近1年内水源水检验报告,使用消毒剂但没有按要求检测消毒剂余量。结论该饮水安全工程存在一定的卫生学风险,水厂需要进一步进行整改,保证居民用水安全。

摘要：Mass transfer and catalyst recovery are two crucial issues in solid base catalysis,while the cumbersome operation steps and the associated time and energy penalties are still inevitable for conventional *** the technical upgrades through catalyst design is desirable but challenging because of the difficulty in satisfying diverse demands of different *** this work,a magnetically responsive solid base catalyst with the rod-like nanostructure was *** rod-like solid base catalysts are composed of Fe_(3)O_(4) cores,silica shells and calcium oxide active *** functions of magnetic recovery and stirring were integrated into the catalyst,which applies in both the general catalytic processes and microchannel reactors given their *** applied to the synthesis of dimethyl carbonate by onestep transesterification of methanol and ethylene carbonate,an apparent enhancement on turnover frequency value(33.1 h^(−1))was observed for nano-stirring compared with that tested without stirring(12.1 h^(−1))within 30 *** present catalysts may open up new avenues in the development of advanced solid base catalysts.

摘要：To increase the service life of rechargeable batteries,transition metal oxide hosts with high structural stability for the intercalation of carrier ions are ***,we reconstruct the crystal structure of a commercial V_(2)O_(5)by pre-intercalating H^(+)and H_(2)O pillars using a facile hydrothermal reaction and obtain a bi-layer structured H_(0.642)V_(2)O_(5)·0.143H_(2)O(HVO)as an excellent host for aqueous Zn-ion *** from the structural reconstruction,the irreversible“layer-to-amorphous”phase evolution during cycling is considerably less,resulting in ultra-high cycling stability of HVO with nearly no capacity fading even after 500 cycles at a current density of 0.5Ag^(-1).Moreover,a synthetic proton and Zn^(2+)intercalation mechanism in the HVO host is *** work provides both a facile synthesis method for the preparation of V-based compounds and a new viewpoint for achieving high-performance host materials.

摘要：随着Internet的迅速发展,组播应用越来越广泛,组播安全问题也更为重要;IPv6也会在不久的将来得到广泛应用,研究IPv6下的组播安全体系是很有必要的.基于IPv6的宽组播地址空间,针对CERNET 2网络的特性及其纯IPv6的环境,将IKAM与Iolus体系比较结合,设计出一个CERNET 2上的、IPv6环境下的IP组播安全体系结构(简称为CDMSA),并对该结构进行了分析和评价.

摘要：晶硅太阳能电池中铝和银的回收是废弃光伏组件资源化的重要内容,氧化-硫酸同步浸出是一种浸出铝和银的有效方式,浸出效率高,经济效益好。本文采用全因子实验设计的方法,以铝和银的浸出率为响应值,以浸出温度、浸出时间、液固比、过氧化氢浓度4个工艺条件为参数因子,通过建立回归模型,分析各参数因子之间的相互关系,得出优化方案,并对其进行验证。实验得到的最佳浸出条件如下:浸出温度为90℃,浸出时间为2 h,液固比为10∶1 (mL∶g),过氧化氢浓度为75 g/L,铝和银浸出率均在99%以上。结果表明:铝和银浸出率的拟合回归模型可信,精确度高,回归模型得出的优化方案经过平行实验验证,误差小,可信度高,全因子实验设计方案合理可靠。

摘要：针对当前的约束处理技术存在易陷入局部最优解、难以满足等式约束和多控制参数的问题,在μ约束处理技术的基础上,以梯度下降法和多目标拥挤距离为理论依据,设计反映种群约束违反度分布信息的ω参数,它可以自适应地调节约束违反度阈值μ的松弛进而有效地解决约束问题.此外,改进了μ阈值比较准则以提高种群的多样性.经对CEC2017的标准约束优化问题(Constraint optimization problems,COP)进行求解,并与其他先进算法相比较,结果表明,改进的μ约束处理技术能够高效地处理含等式约束的COP.

摘要：目的研究塑料材质的感觉特性在儿童玩具中的表现,并在儿童玩具设计中选择适当的塑料材质进行设计。方法就儿童玩具设计中材料使用的要求,针对塑料材质进行感觉特性和情感语义的分析,明确塑料材质具有很强的可塑性,可以适应多种设计要求,并能与其它材料共用以增强设计效果。结论在儿童智力玩具设计的材料选择和使用中采用的塑料材质,进行了有益的设计实践。塑料材质感觉特性的合理利用使玩具的设计效果有良好的展示。

摘要：提出了一种应用粒子群优化算法(PSO)设计极联马赫-曾德尔干涉仪(MZI)型滤波器的新方案。方案巧妙地结合离散型和连续型PSO,利用连续PSO优化耦合角组合、离散PSO优化相移因子组合,由此得到耦合角和相移因子的优化组合,实现光滤波器的优化设计。给出了PSO方案的设计流程及具体步骤,并设计了级联数为3、阶数为5和信道间隔为0.8 nm的梳状滤波器,其输出响应与理论滤波器一致。新方案逼近精度高,同时耦合角限制在(0,π/2)内优化配置。

摘要：本共识围绕医学物理学科的教育现状、专业方向建设、课程设计、实习要求及研究生毕业标准等方面探讨了中国医学物理学科的建设与发展,以应对社会对健康与医疗服务需求的增长及医疗设备国产化的挑战。目前,中国医学物理教育面临教育途径多样性、课程设计差异性、师资短缺等问题,在此,讨论了整合国际经验,构建全面、规范化的医学物理学科体系的策略,体系涵盖放射治疗物理、医学影像物理、核医学物理、放射防护物理、放射生物物理及放射工程物理等方向,并强调人工智能技术的融合,以提高诊疗的准确性和效率。此外,还探讨了医学物理研究生教育的改进,包括师资和教学环境建设、专业课程设置等;还需建立教学质量评估机构,确保教育内容与国际标准一致,反馈学生和雇主的需求。本共识提倡全面提升医学物理学科的规模和影响力,提升教育质量和专业水平,实现教育的精细化和精英化,并加强国内外合作,以期达到国际先进水平,支撑“健康中国2030”政策目标。

摘要：The OsLpa1 gene（LOC_Os02g57400） was identified to be involved in phytic acid（PA） metabolism because its knockout and missense mutants reduce PA content in rice grain. However, little is known about the molecular characteristics of OsLpa1 in rice and of its homologues in other plants. In the present study, the spatial pattern of OsLpa1 expression was revealed using OsLpa1 promoter：：GUS transgenic plants（GUS： β-glucuronidase）; GUS histochemical assay showed that OsLpa1 was strongly expressed in stem, leaf, and root tissues, but in floral organ it is expressed mainly and strongly in filaments. In seeds, GUS staining was concentrated in the aleurone layers; a few blue spots were observed in the outer layers of embryo, but no staining was observed in the endosperm. Three OsLpa1 transcripts（OsLpa1.1, OsLpa1.2, OsLpa1.3） are produced due to alternative splicing; quantitative reversetranscriptase polymerase chain reaction（RT-PCR） analysis revealed that the abundance of OsLpa1.3 was negligible compared with OsLpa1.1 and OsLpa1.2 in all tissues. OsLpa1.2 is predominant in germinating seeds（about 5 times that of OsLpa1.1）, but its abundance decreases quickly with the development of seedlings and plants, whereas the abundance of OsLpa1.1 rises and falls, reaching its highest level in 45-d-old plants, with abundance greater than that of OsLpa1.2 in both leaves and roots. In seeds, the abundance of OsLpa1 continuously increases with seed growth, being 27.5 and 15 times greater in 28-DAF（day after flowering） seeds than in 7-DAF seeds for OsLpa1.1 and OsLpa1.2, respectively. Transient expression of chimeric genes with green fluorescence protein（GFP） in rice protoplasts demonstrated that all proteins encoded by the three OsLpa1 transcripts are localized to the chloroplast.