MC-ICP-MS 测定岩石标准物质的钒同位素组成

随着分析方法的发展和分析精度的提升,钒同位素已经越来越多地被用于各种地质过程研究。为了确保钒同位素分析测试过程中,可以有效地监控数据的准确度和精度,方便国际各实验室之间的数据对比,同时考虑到早期国际上常用美国地质调查局(USGS)的标准物质面临着库存不足等问题,本文采用多接收电感耦合等离子体质谱仪(MC-ICP-MS)测定了一系列国际地质标准物质和国家地质标准物质的钒同位素组成,δ51V值的测试精度优于0.08‰。本文选取的标准物质主要来自日本地质调查局(GSJ)和中国地质科学院地球物理地球化学勘查研究所(IGGE),包括一个安山岩(JA-1),三个玄武岩(JB-3、JB-1b和GBW07105),一个辉长岩(JGb-1),一个辉绿岩(GBW07123)以及一个土壤(GBW07454),钒含量范围为77~635μg/g,涵盖了目前大部分火成岩和部分土壤等天然样品含量的范围。这些标准物质除了土壤GBW07454,其他标准物质的钒同位素组成未曾被报道。经测量表明,辉长岩标准物质JGb-1具有最高δ51V值,为−1.05‰±0.08‰,安山岩标准物质JA-1具有最低δ51V值,为−0.34‰±0.06‰,其余标准物质的δ51V值变化范围为−0.72‰~−0.81‰,均落在MORB范围内。本文对这些标准物质钒同位素组成的报道,丰富了钒同位素研究的标准物质数据库,有助于未来在更多领域开展钒同位素研究。

三疣梭子蟹附肢再生过程中qRT-PCR内参基因的筛选与Wnt7b表达研究应用

为筛选三疣梭子蟹(Portunus trituberculatus)附肢再生过程中的最适内参基因,以附肢再生不同阶段的三疣梭子蟹为研究对象,利用实时荧光定量PCR(qRT-PCR)对细胞骨架蛋白基因(β-actin)、甘油醛-3-磷酸脱氢酶基因(GAPDH)、18S rRNA(18S)、转录延伸因子基因(EF1α)、核糖体蛋白L18基因(RPL18)、细胞色素C氧化酶基因(COX)和组蛋白基因(HIS)共7个候选内参基因在肌肉、眼柄、血淋巴、肝胰腺、鳃、心脏和再生附肢共7种组织中的表达水平进行检测,并利用△Ct、geNorm、NormFinder和BestKeeper程序对候选内参基因的稳定性进行评价,筛选出合适的内参,最后以最适内参基因作为参考,分析再生相关基因Wnt7b的表达水平。结果显示,在不同组织中综合稳定性最好的是RPL18,而在不同再生阶段的再生附肢中β-actin和RPL18基因做双内参基因更适合。以RPL18和β-actin作双内参基因研究Wnt7b的表达水平时发现,Wnt7b基因在三疣梭子蟹附肢再生过程中的表达呈先上升后下降再上升的趋势;Wnt7b基因在三疣梭子蟹各组织中均有表达,除再生附肢和血淋巴外其他组织中的表达量都较低。本研究结果为甲壳类再生发育相关研究内参基因的选择及分子调控机制研究提供了参考。

Book Announcement of L. Celentano, Robust Tracking Controllers Design with Generic References for Continuous and Discrete Uncertain Linear SISO Systems, LAP LAMBERT Academic Publishing, 2012

In this book new results on controller design techniques for the tracking of generic reference inputs are presented. They allow the design of a controller for an uncertain process, either continuous or discrete-time, without zeros, and with measurable state. The controller guarantees that the control system is Type 1 and has the desired constant gain and poles or that the control system tracks, with a specified maximum error and with a specified maximum time constant, a generic reference with bounded derivative (variation in the discrete-time case), also in the presence of a generic disturbance with bounded derivative (variation). In addition, it is considered the case in which the reference is known a priori. The utility and the efficiency of the proposed methods are illustrated with attractive and significant examples of motion control and temperature control. This book is useful for the design of control systems, especially for manufacturing systems, that are versatile, fast, precise and robust.

The UK Education System and References for China

The UK education has a long history and is internationally accepted for its qualifications and teaching standards. This essay firstly gives an introduction about the development of British education since the last century, then discusses the basic structure of British education system and finally suggests some references for our education.

REDEFINING ENSO EPISODES BASED ON CHANGED CLIMATE REFERENCES

Through studying changes in ENSO indices relative to change of climate reference from 1961~1990 to 1971~2000, the study generated new standards to define ENSO episodes and their intensities. Then according to the new climate references and new index standards, ENSO episodes and their intensities for the period 1951 -2003 have been classified. Finally, an analysis has been performed comparing the new characteristics with the old ones for ENSO period, peak values and intensities.

Environmeutal sciences update references in Chinese journals

Selected from Acta Scientiac Circumstantiac,ISSN 0253～2468;Environmental Chemistry,ISSN 0254-6108;Acra Ecologia Sinica,ISSN 1000-0933(The address giben in a reference is that of the first named author)

Evaluation of Expression Stability of Candidate References Genes among Green and Yellow Pea Cultivars (<i>Pisum sativum</i>L.) Subjected to Abiotic and Biotic Stress

Dry pea (Pisum sativum L.) is grown as human and animal feed throughout the world. Large yield losses in pea due to biotic and abiotic stresses compel an improved understanding of mechanisms of stress tolerance and genetic determinants conditioning these tolerances. The availability of stably expressed reference genes is a prerequisite for examining differential gene expression. The objective of this study was to examine the expression profile of several candidate reference genes across a broad range of commercial pea cultivars. Expression profiles of five candidate reference genes;18s rRNA, actin, TIF, β tubulin-2 and β tubulin-3 were examined. Relative quantifications of candidate reference genes were estimated from control plants, plants after 48 h of cold treatment, and plants 24 and 48 h after inoculation with Sclerotinia sclerotiorum, the causal agent of white mold disease of pea. RT-qPCR was performed on cDNA synthesized from three food grade spring peas, Ariel, Aragorn, and Sterling, and two spring yellow peas, Delta and Universal, which are used as animal feed. Analysis of variance (ANOVA) of CT values demonstrated significant variation between varieties and treatments under cold and disease conditions. The most abundant transcripts among tested reference genes were for 18s rRNA. Stability analysis indicated that TIF and β tubulin-3 genes were the most stably expressed candidate genes under both cold and disease stress and could serve as reference genes across a wide range of pea cultivars.

A Brief Analysis on Citation Forms of English Journal Titles in References of Animal Science and Veterinary Medicine Journals

In this paper,the problems of citation forms of English journal titles in references of animal science and veterinary medicine journals were described and analyzed. And the English names of animal science and veterinary medicine journals and corresponding abbreviations were listed for reference by authors.

Teaching Architecture through Design References： The Contribution of Brazilian Journals in the Publication of Visitable Architectures

The aim of this work is to illuminate how the architectural publication in Brazil is influenced by the location of its economic poles. Although the main specialized journals are nationwide read and the published projects are frequently used as design references by students at architecture schools all over Brazil, it appears to be a favor for those projects located at the southeast region. In order to investigate this initial assumption, we selected two of the most influential architectural journals, A U and Project Design magazines, focusing on visitable projects that are, therefore, capable of offering an experience for learning about architectural project. The analysis covered three years of publications in which four states in Brazil were distinguished： Sao Paulo, Rio de Janeiro, Minas Gerais and Federal District. The collected data show that the published visitable projects coincide with the economic poles around centered cities in Brazil, as well as the location of architecture schools and specialized media, becomes evident; not only because of the greater number of projects in the Sao Paulo area, but mainly because most of the published projects are located in the capitals of the analyzed poles.

Reviewing Design References with Diagrams： A Metropolitan Performance Assessment Perspective

The announcement of major sporting events scheduled to take place in Rio de Janeiro in the coming years is now producing several radical urban transformations that are attracting the attention of renowned architects of the international circuit. All this is happening in a city where relevant architectural references have not been produced for a long while because of the prolonged economic crisis of the past. Despite these conditions, people were able to detect “invisible” design lessons to be learned in this city by sharing perceptual experiences with foreign observers who are, by definition, unaware of their preconceptions. This paper deals with the development of a strategy for re-presenting design references that are locally rooted and accessible for direct embodied experience. The strategy put forward a MPI （metropolitan performance index） drawn out from a bibliographical survey coupled with analytical spatial diagrams of different case-studies presented as a tour guide for the recognition of the architecture produced in Rio de Janeiro. It is believed that this strategy can favor the adoption of an eye attuned to contemporary theories especially interested in the spatial and programmatic concerns that today instigate the designer.

General coarsened measurement references for revelation of a classical world

It has been found that for a fixed degree of fuzziness in the coarsened references of measurements,the quantum-toclassical transition can be observed independent of the macroscopicity of the quantum state.We explore a general situation that the degree of fuzziness can change with the rotation angle between two states（different rotation angles represent different references）.The fuzziness of reference comes from two kinds of fuzziness：the Hamiltonian（rotation frequency）and the timing（rotation time）.For the fuzziness of the Hamiltonian alone,the degree of fuzziness for the reference will change with the rotation angle between two states,and the quantum effects can still be observed with any degree of fuzziness of Hamiltonian.For the fuzziness of timing,the degree of the coarsening reference is unchanged with the rotation angle.During the rotation of the measurement axis,the decoherence environment can also help the classical-to-quantum transition due to changing the direction of the measurement axis.

Neonatal References: Epidemiology and Prognosis in a Malian Context

Neonatal mortality remains a public health problem in Mali. The neonatal referral is a systemic factor determining the neonatal prognosis. This work was initiated to determine the frequency of neonatal referrals and to determine their prognosis. Patients and Methods: A cross-sectional study was carried out from November 1, 2019 to January 31, 2020 in the neonatology service of the pediatrics department of the Gabriel Toure University Hospital in Bamako. All newborns referred by another health structure in the country were included in this stud. All newborns referred by another health structure in the country were included in this study. To determine the risk factors related to the neonatal referral, we performed univariate and multivariate analyzes to determine the odds ratios and fitted with a significant p probability if p < 0.05 and the 95% confidence interval. Results: The frequency of referrals was 54.3%. Newborns came from basic structures in 19.3% of cases, from tertiary structures in 6.7%. The main reason for transfer was prematurity (40.2%) followed by perinatal anoxia (15.3%), malformations (15.3%), respiratory distress (15.2%) and infection neonatal (9.1%). The ambulance was the primary means of transfer in 71.3%. In 80% of cases the transfer had been made within the first 24 hours of life. On admission, a third of the newborns (31.1%) were less than 1500 g, hypothermic in 43.8% and febrile in 15.1%. The evolution was marked by 40.2% of deaths. The analysis of prognostic factors, allowed us to observe that the more the newborn is premature or of low weight the more risk of death was very high with respectively 18.5 times in the less than 28 weeks of amenorrhea (WA) (ORa = 18.5;CI = 1.9 - 180;p = 0.012) and 6.6 times in those less than 1000g (ORa = 6.6;CI = 1.4 - 29.7;p = 0.015). Likewise, any change in body temperature increased risk of death by 1.9 times compared to normothermia. Conclusion: The establishment of a neonatal referral system is necessary to reduce neonatal mortality in our context.

Rules for Description in Bibliographic References: Special Literature

GB/T 7714-2005 Rules for description of bibliographic reference is specifically for writers and editors to edit bibliographic references. Legal documents, standard documents and patent documents are considered special. GB/T 7714-2005 provides that description of such literature in bibliographic references should stress the key points and simplify the content.

Comparison between English and Chinese Repeated References to the Same Thing and Parallel Structure

Chinese and English are two very different languages; the former belongs to the Sino-Tibetan Language Family and the latter the Indo-European Language Family. In terms of textual organization, they show substantial differences. Chinese is mainly a pragmatic, paratactic and topic-prominent language, while English a grammatical, hypotactic and subject-prominent language. This thesis gives a contrastive study of two problems in English and Chinese. They are repeated references to the same thing and parallel structure. In this way, the translation work will be more succinct and smooth.

国际数字化转型框架研究:比较与镜鉴

数字化转型框架是转型实践中的理论模型和方法工具,有利于引导组织机构明确战略愿景、核心使命,以及实现转型目标的核心场景、动力机制和关键能力,最终帮助组织机构制定转型行动计划。以国际上75个有关企业(37个)、政府(15个)和教育(23个)三类数字化转型框架为研究样本,采用NVivo12质性分析软件分别对三类数字化转型框架进行编码。在词频和聚类编码分析、比较的基础上,探讨了三类数字化转型框架的共性和个性特征。研究发现,三类数字化转型框架的共同关键行动域是“数字战略和规划、数字技术和数据、数字人才和文化、数字信息安全与伦理、数字生态系统”;在个性特征方面,企业数字化转型框架关注客户需求和创新商业模式;政府数字化转型框架注重利用数据革新公共服务模式及其流程;教育数字化转型框架聚焦在培养师生数字素养方面。镜鉴国际经验,基于数字文明时代、转型内涵、框架特征、行动要素、实践逻辑五大视域构建了教育数字化转型框架,框架应用的成效和转型智慧的涌现,必须彰显“使用者设计”,遵循“自发秩序原理”和教育数字化转型的底层逻辑。

The Research on building cache for Android platform using soft references

Along with the mobile platform increasing development,Android operating system has become the dominant operating system on mobile platforms.As the result of the limitation of Android system computing environment and network resources,it is especially important to apply Cache technology to improve the efficiency of data access.In this paper,a detail study is made on soft reference technology of mobile platform and soft reference strategy is proposed to build a cache on the Android platform application.It has increased the use of system memory efficiently and data access performance.Meanwhile soft reference object can help the Dalvik virtual machine to manage memory and eliminate potential memory leaks well.

低轨巨型星座体系架构设计与关键技术分析

巨型星座中海量网元对现有网络架构和技术体制提出了严峻挑战,如何设计和规划网络体系架构是巨型星座发展的关键问题之一。从星座架构的概念与特征出发,结合国内外卫星星座发展情况与技术预判,提出“四面”(感知平面、数据平面、控制平面、智能管理平面)和“三层”(资源层、传送层、业务层)的多层多域混合式智能协同组网体系架构,设计星座网络管控架构、技术参考模型与协议架构等。同时,针对星座建设与发展趋势,阐述并分析星座网络编址路由、网络鲁棒性敏捷保障、差异化业务承载、端到端可靠传送等关键技术的演化趋势,支撑我国低轨巨型星座网络发展与建设。

广州地区成人网织红细胞相关参数参考区间的调查研究

目的 调查广州地区成人网织红细胞相关参数的参考区间。方法 选择2022年12月1日至2023年5月25日在南方医科大学南方医院体检的1 064名健康者进行网织红细胞检测,参数为网织红细胞计数(RET#)、网织红细胞百分比(RET%)、未成熟网织红细胞比率(IRF%)、低荧光网织红细胞百分比(LFR%)、中荧光网织红细胞百分比(MFR%)、高荧光网织红细胞百分比(HFR%)、网织红细胞血红蛋白量(RET-He),健康志愿者按性别分组。另外,收集男女健康者各20份静脉血,进行参考区间验证。结果 网织红细胞相关参数呈偏态分布(P<0.05),采用百分位数法建立参考区间,男性组RET%、RET#、IRF%、LFR%、MFR%、HFR%、RET-He的参考区间分别为0.93%~2.95%、(47.1~147.4)×10^(9)/L、5.60%~20.20%、79.86%~94.40%、5.00%~14.76%、0.30%~6.28%、32.60~37.88 pg,女性组以上参数参考区间分别为0.92%~2.64%、(41.57~118.56)×10^(9)/L、4.47%~18.53%、81.47%~95.53%、4.20%~13.47%、0.20%~5.67%、31.40~37.10 pg。男女组均通过参考区间验证。结论 初步调查了广州地区成人网织红细胞相关参数参考区间。

气候变化背景下山西省气象干旱时空演变特征

干旱频发对生态资源、农业发展造成了严重影响,为揭示山西省干旱时空演变特征,基于1971—2020年山西省24个气象站点的逐月气象资料,利用改进的Mann-Kendall方法检验各气象因子的年变化趋势,采用FAO56 Penman-Monteith公式计算参考作物腾发量(ET0),分析单个气象因子变化情况下ET0的变化特征和对气象因子的敏感性,比较各时间尺度(月、季、年尺度)不同干旱指数(降水距平百分率(Pa)、标准化降水指数(SPI)和标准化降水蒸散指数(SPEI))对山西省干旱灾害监测能力。结果表明:ET0与相对湿度呈负相关,气象因子对ET0的敏感性由大到小依次为相对湿度、日最高气温、2 m处风速、日最低气温、日平均气温,ET0呈波动下降趋势。SPEI能够在多时间尺度上有效反映山西省干旱状况,是该地区干旱监测的有效工具。在月、季、年尺度下,比较3个干旱指数,Pa检测效果较差,SPI和SPEI在某些地理区域存在较大差异,整体而言,SPEI在多数地区检测干旱的性能更好;SPEI-1尺度下,各干旱等级发生频率由大到小依次为轻旱(14.8%)、中旱(10.6%)、重旱(5.6%)、特旱(1.9%),3月干旱发生率最高(34%),12月发生率最低(31.8%),吕梁市、晋中市、大同市干旱情况较为严重;SPEI-3尺度下,季节发生干旱频率由大到小依次为秋季(33.5%)、夏季(32.5%)、春季(31.9%)、冬季(31.4%),大同市、长治市特旱发生频率最高,旱情最为严重,忻州市轻旱频率、朔州市中旱频率、吕梁市重旱频率最高;SPEI-12尺度下,轻、中、重、特旱频率分别为14.8%、10.5%、5.4%、2.3%,SPEI-12相较SPEI-1和SPEI-3识别重旱、特旱的站点更多,并基于游程理论得出,山西省南部干旱频次更多,东部干旱历时更长、干旱严重程度更大,干旱峰值主要出现在山西省南北部,由于年均降水呈波动性下降,年均气温整体上升,山西省的气候趋于暖干化,南北部旱情将有所加重,中部地区旱情有所减缓,全域性干旱仍有很大发生可能。

精子线粒体膜电位作为综合评估男性生育能力指标的初探

目的本研究旨在探讨精子线粒体膜电位(MMP)与精液常规、精子形态学以及精子DNA碎片指数(DFI)之间的关联,以及MMP对于临床评估和预测男性生育能力的价值。方法选择2023年4—7月于江苏省中医院男科进行孕前优生检查、生育咨询以及不育症治疗的患者的精液标本为研究对象,按照世界卫生组织(WHO)第5版标准进行精液常规和精子形态学分析,并通过流式细胞术检测精子DFI和MMP。根据不同精液质量分为两组:精液质量各项指标均正常,即精液量>2 ml、pH值7.2~7.8、精子浓度≥15×106/ml,精子前向运动(PR)≥32%、精子形态正常率≥4%、DFI<30%为精液质量正常组(n=57);PR<32%、精子形态正常率<4%、DFI≥30%为精液质量异常组(n=67),比较两组精液质量各项参数;采用Spearman相关性分析,分析MMP与精子浓度、PR、精子形态正常率以及DFI之间的关系;绘制受试者工作特征曲线(ROC),分析MMP对于临床评估男性生育能力的价值。结果两组间平均年龄、精液量比较均无显著差异(P>0.05),精液质量正常组精子浓度、PR、精子形态正常率、MMP显著高于精液质量异常组(P<0.05),DFI显著低于精液质量异常组(P<0.05);Spearman相关性分析结果显示,MMP与精液量无明显相关性(r=-0.065,P=0.475),与精子浓度(r=0.396,P<0.001)、PR(r=0.471,P<0.001)、精子形态正常率(r=0.468,P<0.001)呈显著正相关,与DFI(r=-0.701,P<0.001)呈显著负相关;ROC分析结果显示,MMP对精液质量整体水平预测的ROC曲线下面积(AUC)为0.891,敏感度87.5%,特异性83.3%,截断值53.69%;MMP对精子浓度预测的AUC为0.787,敏感度82.0%,特异性69.2%,截断值43.97%;MMP对PR预测的AUC为0.741,敏感度65.7%,特异性84.2%,截断值56.33%;MMP对精子形态正常率预测的AUC为0.733,敏感度71.1%,特异性69.1%,截断值56.63%;MMP对DFI预测的AUC为0.809,敏感度89.5%,特异性72.1%,截断值54.78%。结论精子MMP与精子浓度、PR、精子形态正常率呈显著正相关,与DFI呈显著负相关。与各单项精液指标相比,MMP能更全面地反映精子能量代谢和凋亡,推荐将MMP 54%作为全面评估和预测男性生育能力的参考值下限。