Chemical Analysis Method for Magnesia and Magnesia-Alumina Refractories——Gravimetric-Molybdenum Blue Photometric Method for Determination of Silicon Dioxide Content

This standard specifies the gravimetric-molybdenum blue photometric method for determination of silicon dioxide content.

Overview of Precious Metal Content Analysis Methods in Automotive Catalytic Converter

With the increasing awareness of environmental protection, people’s concern of pollution issues arising. Vehicles, as the most important means of transportation, its exhaust emission has received considerable attention. The catalytic converter is able to purify harmful substances in exhaust gas. The absolute content of precious metals in the catalytic converter dominates the exhaust gas purification effect. Accurate detection of precious metal content is of great significance for controlling the cost of catalysts, ensuring catalytic performance and recovering precious metals from spent catalysts. We herein summarized several instruments for precious metals content exploration, such as X-ray fluorescence spectrometer (XRF), atomic absorption spectrometer (AAS), inductively coupled plasma emission spectrometer (ICP) and spectrophotometer. In this thesis, the feasibility of using various devices for characterizing precious metal content in catalytic converters is analyzed and their strengths or weaknesses are elaborated.

Chemical Analysis Method for Carbon Bearing Refractory Products——Determination of Magnesium Oxide Content by CyDTA Volumetric Method

This standard specifies the method summary, reagents, apparatus, sampling, procedure, test results calculation and permissible tolerance of the determination of magnesium oxide by CyDTA volumetric method.

Chemical Analysis of Magnesia and Magnesia-Alumina Refractory Materials——Flame atomic absorption spectrometric method for determination of calcium oxide content

1 Scope This standard specifics the determination of calcium oxide coutent by flame atomic absorption spectrometric method.

Analysis of the Conditional Correlations from Different Genetic Systems Between the Protein Content and the Appearance Quality Traits of Indica Rice

A factorial mating design in two environments was conducted using 7 cytoplasmic male sterile lines （A） and 5 restorer lines （R） along with their F1 （A × R） and F2 populations. The unconditional and conditional analyses of genetic models and the corresponding statistic methods, including endospermic, cytoplasmic, and maternal plant genetic systems, were used to analyze the genetic relationships between protein content （PC） and the appearance quality traits of indica rice （Oryza sativa L.）. The results from unconditional analysis indicated that PC was significantly correlated with the appearance quality traits of rice, except for the brown rice thickness （BRT）. Only the genetic covariance between PC and the brown rice width （BRW） was positively correlative, whereas all the other pairwise traits were negatively correlative. The results from conditional analysis revealed that the weight of brown rice （WBR） or the amylose content （AC） could significantly affect the relationships between PC and the appearance quality traits of indica rice. The conditional analysis showed that WBR might negatively affect the relationships between PC and the brown rice length （BRL）, BRW, or BRT through the geuotype x environmental （GE） interaction effects, but positively affected the relationships between PC and the ratio of brown rice length to width （RLW） or the ratio of brown rice length to thickness （RLT）. The amylase content could positively affect the relationships between PC and BRL, RLW, RLT through the cytoplasmic effects and maternal additive effects, but negatively affected the relationships between PC and BRW.

Spectral Synthesis via Mean Field approach to Independent Component Analysis

We apply a new statistical analysis technique, the Mean Field approach to Independent Component Analysis（MF-ICA） in a Bayseian framework, to galaxy spectral analysis. This algorithm can compress a stellar spectral library into a few Independent Components（ICs）, and the galaxy spectrum can be reconstructed by these ICs. Compared to other algorithms which decompose a galaxy spectrum into a combination of several simple stellar populations, the MF-ICA approach offers a large improvement in efficiency. To check the reliability of this spectral analysis method, three different methods are used：（1） parameter recovery for simulated galaxies,（2） comparison with parameters estimated by other methods, and（3） consistency test of parameters derived with galaxies from the Sloan Digital Sky Survey. We find that our MF-ICA method can not only fit the observed galaxy spectra efficiently, but can also accurately recover the physical parameters of galaxies. We also apply our spectral analysis method to the DEEP2 spectroscopic data, and find it can provide excellent fitting results for low signal-to-noise spectra.

Research progress on fluorescence analysis of antitumor Chinese medicine components

This paper classifies the anti-tumor traditional Chinese medicine's fluorescence analysis and finds that its research content mainly includes two aspects:the application of fluorescence analysis in the determination of the effective component content of anti-tumor traditional Chinese medicine;the study of the combined use of fluorescence imaging technology and the drug.According to literature analysis,it is found that although the research on the fluorescence analysis of anti-tumor Chinese medicine components is in a good state of development,it still needs to explore further in the identification of unknown components and deeper research on known components.Therefore,it can provide a certain basis for clinical guidance of tumor patients.

以工程教育认证为导向的材料成形CAD/CAE/CAM课程教学改革探索

以工程教育认证为导向,文章分析了材料成形CAD/CAE/CAM课程的现状及存在问题,结合课程自身特点,主要从教学内容、教学方式和考核方式三方面对课程进行初步改革探索,文章指出课程的教学改革要以学生为中心,充分考虑学生多样化所带来的个体差异性,培养学生的自主学习能力和创新实践能力。

Policy implications for community-managed forestry in Cambodia from experts＇ assessments and case studies of community forestry practice

Over the last 40 years, it has been shown at the global level that sustainable forestry can be achieved through comprehensive forest management,with the decentralized institutional arrangements of community-managed forestry coordinated by effective policy implementation. However, there is still a shortage of evidence regarding whether communitybased forestry is well characterized by forest policies,assessing what action is most needed and how best to address the challenges faced by community-based forestry in halting deforestation and promoting rural livelihoods. The study analyzed experts' assessments of the characteristics and success of communitymanaged forestry in Cambodia and explored three case studies of community-managed forestry practice to identify priorities for addressing forest policy implementation inadequacies in halting deforestation and promoting rural livelihoods. There were two methods of data collection. Firstly, this study used a survey of 27 experts to analyze perceptions about how far forest policy supported community-managed forestry effectively, the major challenges faced by the national community-managed forestry program, and the community-managed forestry contribution to halting deforestation and reducing rural poverty.Secondly, data was collected by content analysis of three case studies to explore the knowledge and practical experience of local experts about community-managed forestry practice at local level.The study employed Kendall's Coefficient of Concordance to analyze the level of concordance of experts on related forest policies(n=15) considering community-managed forestry, the challenges faced by the national community-managed forestry program,and the actions required to enable communitymanaged forestry to support communities. Analysis revealed that experts were in moderate agreement,denoted by Kendall's W=0.152, on how well forest policies articulate and implement the characteristics of community-managed forestry. Ranking of the major challenges faced by the national communitymanaged forestry program yielded Kendall's W of0.104, indicating the confidence in the ranking among experts was fair. There was only low confidence in the ranking of the action needed, with Kendall's W of0.055. Content analysis of the three case studies examining local experts' opinions on the attributes of community-managed forestry concerning the access,local participation and protection of the sustainable forestry revealed that Attribute one ‘Local people have access to the forest land and forest resources', and Attribute three ‘Local people begin by protecting and restoring the forests', received high attention from local experts. Of lesser importance or agreement was attributing two: local participation in decision-making concerning the forest.

AN INVESTIGATION ON NEAR-INFRARED ABSORPTION METHOD FOR MEASURING SUGAR FROM COTTON

In this paper, the authors investigated the feasibility of near-infrared to measure sugar at cotton fibre. The simple regression equations are generated by respectively correlating thc absorption data(by using 1640nm and 2100nm wavelengths) with sugar( glucose, fructose and sucrose) and the regression modes possess a high coefficient of correlation. The differences for absorption of various sugars at some (?)velengths are diseussed.

基于政策工具的河南省医养结合政策文本分析

目的:选取2016~2023年河南省医养结合政策文本为研究对象,研究分析政策文本内容的特征及不足,提出合理化建议,为完善河南省医养结合政策体系提供参考。方法:以政策工具为视角,结合参与主体维度构建二维分析框架,采用内容分析法对27个政策文本进行分析,得到有效编码172条。结果:政策工具结构不平衡,供给型政策工具占29%,需求型政策工具占8%,环境型政策工具占63%;参与主体分布不均衡,政府参与占61%,养老机构参与占8%,医疗卫生机构参与占16%,社会组织参与占12%,健康产业参与占3%。结论:河南省医养结合政策内容丰富、层次鲜明、目标清晰,但政策工具结构不平衡、参与主体分布不均衡,要优化政策工具间结构、协调各参与主体在政策工具中分布、加强各参与主体在各个政策工具中的交互协作,促进河南省医养结合政策发展。

基于内容分析法的城镇雨水系统碳排放核算研究进展

采用内容分析法,从核算对象、核算范围、核算方法及排放因子等方面,对现有城镇雨水系统碳排放核算研究情况进行了系统回顾。结果表明:现有研究基本明确了雨水系统碳排放核算公式,为开展多尺度雨水系统碳排放核算奠定了方法基础;现有研究核算了部分雨水设施部分阶段的碳排放因子,但存在核算范围不一致、方法不统一、排放因子不透明等问题,不同研究结果之间可比性较差,核算结果具有很大不确定性;雨水设施碳排放因子完整性较差,与形成统一规范的雨水系统碳排放核算体系存在一定的差距。为规范雨水系统碳排放核算体系,未来研究应重点关注截留式排水体制下雨水系统核算边界划分、直接碳排放精准测度和水能利用的碳抵消效应,逐步构建适用于雨水系统碳排放核算的综合因子数据库。

生成式人工智能教育应用政策比较:共识、差异与实施进路

生成式人工智能教育应用近年来备受瞩目,其强大的生成能力为教育领域注入新的活力。然而,我国关于生成式人工智能教育应用方面的法律法规仍处于空白状态,这无疑对生成式人工智能广泛应用带来了不小挑战。为弥补这一政策空白,运用内容分析法,对国际上已发布的具有代表性的三项政策,从教师教学、学生学习、教学评价、教学研究、学习辅导和教育管理六个核心维度进行分析。在此基础上,挖掘三项政策的共识、差异,以期为我国生成式人工智能教育应用的政策制定提供借鉴,推动其在教育领域的纵深发展和广度辐射,并提出五条实施进路:一是重塑教育蓝图,法规保障消除潜在隐患;二是强化监管体系,法律监管防范潜在风险;三是聚焦育人目标,不断提高教师数字胜任力;四是提升学生数字素养,落实人本主义理念;五是适配场景与对象,创新应用模式和方法。

美国情报界数据管理的流程、架构及其启示——基于情报数据战略演进视角

[研究目的]爆炸式数据增长态势下,如何快速、有效地进行情报数据管理是当前情报机构的重点任务。基于情报数据战略演进视角,梳理《情报界数据战略2023—2025》等美国政府官方文件,分析美国情报界数据管理的流程、架构,以期为我国实现数据驱动情报的发展提供启示和参考。[研究方法]采用内容分析、文献研究等方法,研究美国情报界数据管理的生命周期、体系架构,从战略演进动因、指导思想演进、数据处理演进、人才队伍演进四个方面,针对美国情报界数据战略核心内容演进特点进行剖析。[研究结论]情报界数据管理生命周期是数据战略和数据管理的基础,包括计划与任务、获取与评估等6个不同环节。数据参考体系结构(DRA)和参考体系结构框架(RAF)共同组成情报界数据管理体系架构。为适应国际战略竞争形势的发展,我国应当从情报数字化转型、数据整合创新、跨部门数据访问、人才队伍培养、数据隐私安全等方面着力,加速推动情报机构数字化转型。

降雨作用下考虑结构面劣化的边坡块体稳定性评价

降雨是诱发边坡失稳,发生崩塌、落石、滑坡的一个主要诱因,降雨作用下结构面强度会发生劣化,导致边坡块体失稳塌落,引起地质灾害,对人民生命财产构成严重威胁。基于离散元数值分析方法,考虑降雨作用对结构面抗剪强度的影响,分析结构面强度参数劣化及孔隙水压力变化规律,建立抗剪强度劣化模型;结合坐标投影原理提出考虑降雨作用下结构面强度劣化效应的块体稳定性系数计算方法;基于有限元分析方法研究降雨强度与降雨历时对岩质边坡块体稳定性的影响,并进一步分析稳定性系数与降雨强度及降雨历时的关系,提出降雨作用下考虑结构面劣化的边坡块体稳定性评价方法。研究表明,不同含水率作用下结构面的抗剪强度劣化不仅受黏聚力和内摩擦角影响,还与孔隙水压力有关,针对单滑面和双滑面型块体构建了考虑结构面降雨劣化的稳定性分析数学模型,提出的以降雨时长、降雨强度和块体稳定性关系曲线的共同评价体系可为边坡块体稳定性评价提供科学依据,并推动边坡地质灾害防治和工程建设发展。

国内外语教学翻转课堂研究:范围综述

本文基于范围综述研究框架,以2013—2021年在CSSCI来源期刊和北京大学中文核心期刊上发表的226篇有关外语教学翻转课堂研究的论文为研究对象,采用文献计量法和内容分析法,从文献基本信息、研究主题、发展动态、研究方法、研究内容及实施效果6个维度进行统计分析。研究结果显示:外语翻转课堂研究发文量逐年降低;热点主题演进趋势呈现早期以理论引介为主,中期以本土化应用为主和后期以实证调查为主的发展态势;相关研究以实证类为主,主要采用混合式研究方法;翻转课堂对外语教学总体产生积极影响。现存问题是研究内容相似;研究方法同质性较高,缺乏创新性。

骨骼风痛片的综合质量评价

目的建立测定骨骼风痛片中原薯蓣皂苷等11种成分含量的方法,同时进行化学计量学分析及熵权优劣解距离(EW-TOPSIS)法分析,以综合评价骨骼风痛片的质量。方法采用高效液相色谱法。以Agilent Eclipse Plus C18为色谱柱,以乙腈-0.2%磷酸溶液为流动相进行梯度洗脱,流速为1.0 mL/min,柱温为30℃,检测波长为203 nm(0~28 min,原薯蓣皂苷、甲基原薯蓣皂苷、伪原薯蓣皂苷、薯蓣皂苷)、280 nm(28~60 min,儿茶素、表儿茶素、甘草素、美迪紫檀素、6-姜辣素、8-姜酚、10-姜酚),进样量为10μL。以表儿茶素为内参物,采用一测多评(QAMS)法计算原薯蓣皂苷、甲基原薯蓣皂苷、伪原薯蓣皂苷、薯蓣皂苷、儿茶素、甘草素、美迪紫檀素、6-姜辣素、8-姜酚和10-姜酚的含量,并与外标法检测结果进行比较;采用SPSS 26.0、SIMCA14.1软件进行主成分分析和正交偏最小二乘法-判别分析,以变量重要性投影(VIP)值大于1为标准,筛选影响质量的差异标志物;采用EW-TOPSIS法对15批样品的质量进行综合评价。结果高效液相色谱结合QAMS法测得原薯蓣皂苷、甲基原薯蓣皂苷、伪原薯蓣皂苷、薯蓣皂苷、儿茶素、甘草素、美迪紫檀素、6-姜辣素、8-姜酚和10-姜酚的含量分别为6.330~10.863、1.150~2.274、0.431~0.740、2.818~4.823、0.826~1.510、0.043~0.094、0.079~0.231、0.479~1.020、0.146~0.288、0.118~0.318 mg/g,与外标法比较差异均无统计学意义(P>0.05);15批样品可分为3组,S1~S6、S7~S10、S11~S15分别聚为一组;原薯蓣皂苷、表儿茶素、薯蓣皂苷、6-姜辣素的VIP值均大于1;15批样品的最优解欧氏贴近度(Ci)为0.1635~0.7037,其中S11~S15样品的Ci值均大于0.6。结论所建QAMS法准确、简便,结合化学计量学分析及EW-TOPSIS法可用于综合评价骨骼风痛片的质量;原薯蓣皂苷、表儿茶素、薯蓣皂苷和6-姜辣素可能是影响骨骼风痛片质量的差异标志物;S11~S15样品的质量较好。

生物医药企业社会责任报告披露质量评价

企业社会责任报告影响企业声誉和市场认可度,利益相关方对企业信息披露的内容和质量要求越来越高,我国企业社会责任报告披露质量还存在不足。本文综合不同社会责任报告评价标准,结合我国实际,构建了包括7个维度的评价体系。依据该体系,以2018-2020年中证800(CSI800)中的27家上市生物医药企业为样本,应用内容分析法和专家打分法对样本企业社会责任报告内容的披露质量进行分析和评价。结果表明,生物医药企业发布社会责任报告数量虽然总体呈上升趋势,但其内容质量总体水平偏低,还存在着对社会责任理念认识不足、披露信息的质量不高、缺乏第三方监督审验等问题。就此提出要加强企业对社会责任理念的理解和认识、落实企业对社会责任治理与管理方面的信息披露、完善企业社会责任报告的编制标准和会计制度及推进社会责任报告规范化和合法化等策略建议。

需求分析视角下大学英语课程教学内容及教学方法调查研究——以凯里学院为例

在需求分析视角下,历时3个学期,通过问卷、课堂观察及访谈的方式调查了学生学习大学英语的目标情景及目前情景,前者包括学生学习大学英语的目的、目标、学习重点、教师需要讲授的重点等方面,后者包括学习态度、学习基础、难点及最喜欢的学习方式、教学方式、课外英语学习时间等。结果显示:(1)学生学习大学英语的目的是内在英语能力的提高和对未来职业发展的帮助;学习目标是提高英语应用能力、掌握学习方法及提高综合素质;学习重点与教师需要讲授的重点相一致。(2)大部分学生英语学习基础弱,学习难点包括词汇量、语音、语法、相关文化知识等,但课外英语学习时间较少;最喜欢的学习方式及教学方式都是教师讲授及讨论;有更多师生交流及在课堂上运用英语知识的需求。调查结果能为西南民族地区地方本科院校的大学英语教学内容及教学方法改革提供现实依据。