Study on fasART neuro-fuzzy networks for distinguishing the difficulty degree of top coal caving in steep seam

Distinguishing the difficulty degree of top coal caving was a precondition of the popularization and application of the roadway sub-level caving in steep seam. Because of complexity and uncertainty of the coal seam, the expression of influence factors was diffi-culty with exact data. According to the fuzzy and uncertainty of influence factors, triangular fuzzy membership functions were adopted to carry out the factors ambiguity, of which the factors not only have the consistency of semantic meaning, but also dissolve sufficiently expert knowledge. Based on the properties and structures of fasART fuzzy neural net-works of fuzzy logic system and practical needs, a simplified fasART model was put for-ward, stability and reliability of the network were improved, the deficiency of learning sam-ples and uncertainty of the factors were better treated. The method is of effective and practical value was identified by experiments.

Sensitivity Analysis on the Negative Degree of Difficulty Geometric Programming Problem

The range of optimal values in cost optimization models provides management with options for decision making. However, it can be quite challenging to achieve feasible range of optimality in Geometric programming (Gp) models having negative degrees of difficulty. In this paper, we conduct sensitivity analysis on the optimal solution of Geometric programming problem with negative degree of difficulty. Using imprest data, we determine the optimal objective function, dual decision variables, primal decision variables;the range of values, the cost coefficient and RHS constraint must lie for the solution to stay optimal. From the analysis, we established that incremental sensitivity analysis has the functional form .

A study of the inspiration of content schema in Higher vocation students English Reading Teaching

On account of the difficulties appeared in the higher vocational students'English reading comprehension,the author connected these difficulties with four schemas included in the schema theory,and according to content schema,made an experimental study on reading test.Through data contrast and analysis of two groups'reading test results,the author concluded the content schema had certain significance for the higher vocational English reading teaching practice.

On the Integrated Learning of English and Law

This paper centers on the integrated learning of English and law in China.Firstly,it outlines the importance of English in the solution of the ever increasing legal disputes between China and the outside world,which inevitably involves an integrated learning of English and law.Secondly,it points out that the content of legal English reflects a combination of legal knowledge and English skills.Thirdly,it expounds on the difficulties that Chinese English majors are facing in the process of learning English and law simultaneously and furnishes some practical suggestions.

Simulation of maize drought degree in Xi'an City based on cusp catastrophe model

Drought generally has significant impacts on crops.It is essential to quantitatively evaluate the relationship between crop production and drought degree to provide technical support for drought disaster prevention.In this study,a drought degree index that can reflect the changes in precipitation,evapotranspiration,and soil moisture was developed on the basis of crop yield reduction rate.Four drought scenarios were set up to simulate the effects of meteorological drought on drought degree of crops at different growth stages.A cusp catastrophe model was constructed to analyze the mutation characteristics of the drought degree of maize at different growth stages under different meteorological drought conditions.Xi'an City in China was selected as the study area,and summer maize was selected as the research crop.Precipitation and crop yield data from 1951 to 2010 were used as the fundamental data to investigate drought degree mutation of summer maize.The results show that,under the meteorological drought conditions at the emergence-jointing stage,drought degree may change abruptly,and soil moisture content at the sowingemergence,jointing-tasseling,and tasseling-mature stages should be kept higher than 39%.

Influence of Moisture Content,Variety and Parboiling on Milling Quality of Rice Grains

The effects of moisture content （8%, 10%and 12%）, variety （Tarom and Fajr） and parboiling on milling quality of rice as a function of milling recovery （MR）, head rice yield （HRY）, degree of milling （DOM） and whiteness were investigated. The parboiled grains was prepared with three soaking temperatures of 25 oC, 50 oC and 75 oC and three steaming times of 10, 15 and 20 min. As a result of parboiling, the increasing rates of MR and HRY values were 7.8%and 14.3%for Tarom and 9.8%and 10.0%for Fajr, respectively, and the decreasing rates for DOM and whiteness were 6.6%and 10.8%for Tarom and 6.8% and 10.5% for Fajr, respectively. Moreover, decreasing moisture content to 8%maximized MR （75.8% for Tarom and 74.3% for Fajr） and HRY （65.8% for Tarom and 57.0% for Fajr） while increasing that to 12%revealed maximum values of DOM （6.1%for Tarom and 6.2%for Fajr） and whiteness （24.8%for Tarom and 28.2%for Fajr）.

高职高专院校高质量试点职教本科人才培养研究

职教本科是职业教育改革发展的必然结果,是经济社会高质量发展的应然需求,也是满足人们追求高层次职业教育的有效路径。高职高专院校试点职教本科人才培养,是服务国家发展战略、增强职业教育社会影响力和探索新型高职人才培养模式的客观需要。但是,由于受到政府、社会和学校等因素的影响制约,高职高专院校高质量试点职教本科教育面临着不少宏观层面和微观层面的现实性困境。对此,要完善政策体系建设,增强政策资源供给的有效性;引导社会树立正确职教观念,提升高职学生社会地位;深化产教协同育人,构建校企育人命运共同体;明确质量目标,强化专业特色发展;科学规划内部顶层设计,高效率使用育人资源;确立师资选拔培训机制,全面提升整体科研能力。

浙江省3个油橄榄主栽品种果实表型与品质性状分析

为摸清油橄榄Olea europaea引入浙江栽植后的表现,以3个主栽品种‘城固32号’O.uropaeain‘Chenggu32’‘鄂植8号’O.uropaeain‘Ezhi 8’和‘豆果’O.uropaeain‘Arbequina’的果实为材料,测定不同成熟度下的果实表型和品质性状,并采用方差分析、相关性分析和主成分分析法确定最佳采收期及果实表型与品质性状的差异性。结果表明,3个品种果实的成熟时间不同,成熟时间从早到晚依次为‘城固32号’(9月18日)、‘鄂植8号’(10月7日)和‘豆果’(10月28日);3个品种果实的成熟期也不同,分别为28 d(‘城固32号’)、47d(‘鄂植8号’)和68d(‘豆果’);根据鲜果质量和含油率确定‘城固32号’‘鄂植8号’和‘豆果’的最佳采收期分别为第5成熟度、第4成熟度和第5成熟度;方差分析结果表明,3个油橄榄品质性状在品种间差异显著(P<0.05),同一品种不同成熟度也存在显著差异(P<0.05);相关性分析分析结果表明,油橄榄果实表型性状间和品质性状间存在显著相关性,通过果实表型性状可以推测果实品质的差异;通过油橄榄果实品质性状主成分分析结果表明,前三个主成分的特征值最大,分别为5.88、3.52和2.16,累积贡献率达到88.86%。本文研究结果有助于通过不同油橄榄品种的表型性状差异来推断果实品质性状的差异性,可为浙江油橄榄品种引种工作提供重要参考。

PMIA树脂溶液中盐酸含量的测定

分别以乙酸钠-甲醇溶液、氢氧化钾-甲醇溶液为滴定剂,采用电位滴定法测定不同中和程度的聚间苯二甲酰间苯二胺(PMIA)树脂溶液中盐酸含量,并对2种测试方法的准确度和精密度进行比较。结果表明:采用2种测试方法测定中和程度分别为0、60%、95%、100%的PMIA树脂溶液中盐酸含量,2种测试方法的测定结果相近;采用F检验和t检验两种统计法验证了显著性水平为0.05、置信度为95%时2种测试方法的准确度和精密度均无显著差异,以氢氧化钾-甲醇溶液为滴定剂的测试方法的精密度更高;采用标准盐酸加入法,并以氢氧化钾-甲醇溶液为滴定剂测定不同中和程度的PMIA树脂溶液中盐酸回收率,平均回收率为96.5%~98.5%,验证了该方法的准确性;对于正常滴定过程中等当点不易识别的PMIA树脂溶液,可通过预加已知量的盐酸后再采用氢氧化钾-甲醇溶液滴定,从而确定溶液的酸碱性。

环境工程专业学位硕士试验设计与数据处理课程教学优化——基于国内外三所高校案例

文章比较了清华大学试验设计与分析线上课程和昆士兰大学试验设计线下课程在教学内容和教学方法方面的差异,并分析了各自的特点;在此基础上,介绍了中国矿业大学环境工程专业学位硕士试验设计与数据处理课程结合人才培养目标,进行教学内容和教学方法优化,并实施线上线下混合式教学模式的实践。中国矿业大学的试验设计与数据处理课程教学达到了使学生“懂理论、会应用、能实践”的目标。

根土复合体抗剪特性变化特征及强度预估研究

根土复合体剪切特性受含根量与压实度的影响,为探究二者对根土复合体抗剪特性的影响程度,以黑麦草根土复合体重塑试样为研究对象,进行了不同含根量(0%、0.15%、0.3%、0.45%、0.6%)与不同压实度(85%、90%、95%)的根土复合体三轴压缩试验,分析了15%应变对应的极限主应力差与抗剪强度指标的变化规律,建立了抗剪强度计算公式。结果发现:①在相同围压下,根土复合体的极限主应力差相比于素土增加了6~79.9kPa,增幅为6.8%~65.5%。②压实度相同时,随着含根量的增加,根土复合体极限主应力差先增加后减小,压实度为85%、90%、95%时在含根量为0.3%、0.3%、0.45%时极限主应力差最大,即为最优含根量。③基于试验结果,建立了同时考虑含根量、压实度和围压的根土复合体抗剪强度计算公式,公式的拟合精度(R2)为0.943。采用原状土根土复合体试样对公式进行验证,发现公式的预测精度(R2)为0.96。研究结果为黑麦草根系固土提供理论依据。

人工智能生成内容对消费者分享行为的影响研究

近年来,越来越多的企业开始运用人工智能来自动生成内容,但学术界对这类新现象还缺乏研究。本文基于印象管理理论和情绪调节理论,综合运用实地实验和实验室实验方法在五种内容类型(现代诗、画作、古诗、寓言故事、新闻)中共收集了970份有效数据,检验了人工智能生成内容对消费者分享行为的影响。研究结果表明,在内容核心信息完全相同的情况下,当消费者得知内容是由人工智能(对比人类作者)生成时,会产生更高的科技创新形象预期与情绪唤醒,并由此产生更强的分享意愿与更多的分享行为。消费者的公众自我意识与内容创作难度是人工智能生成内容主效应的调节变量,在高公众自我意识的消费者中和面对较高创作难度的内容时,人工智能生成内容对消费者分享的影响将更加显著。本文研究结论有助于理解当代消费者面对人机不同主体生成内容时的不同心理认知和行为反应,同时可以为采用人工智能技术的内容生产企业进行有效营销沟通和合理选择目标市场提供借鉴。

考虑有机质含量及分解度的草炭土导热系数模型改进

土壤导热系数是决定土层传热性能的主要参数,影响到地温分布、土壤环境及作物生长。高有机质土的导热系数受到有机质组分直接影响,而目前土壤导热系数模型缺乏对有机质含量及分解度的考虑。该研究采用稳态比较法测定了未冻结及冻结状态下的草炭土导热系数,分析了不同层位原状草炭土性质对导热系数的影响,对比了10余种土体导热系数计算模型对草炭土的适用性,并以此提出了改进模型。结果表明:1)各层位草炭土在未冻结状态下导热系数相近(0.51~0.66 W/(m·K)),而冻结后导热系数层间差异明显(1.00~1.62 W/(m·K)),表明冻结极大地改变了土体物质组成,而有机质含量及分解度显著影响着土体的传热性质;2)考虑了干密度及组分权重的土体导热系数模型对草炭土的预测适用性更佳,但准确度仍然难以达到理想效果;3)基于土体性质的影响程度及计算模型的原理,引入草炭土有机质含量O_(c)及分解度D_(d)计算草炭土导热系数,建立了改进模型,提高了参数模型准确率(R^(2)>0.75)。研究成果可为季冻草炭土分布区的农业耕作及工程建设提供参数依据,同时可作为高有机质土体热物理性质研究的理论参考。

绝缘纸在矿物油与菜籽油基天然酯中的加速热老化特性分析

天然酯较矿物绝缘油具有燃点高、可降解性好并且能延缓绝缘纸热老化速率等优点,作为提升变压器寿命或短时过载能力的液体绝缘介质正受到广泛关注。本文选取我国食用油中占比较大的菜籽油作为基油制备天然酯绝缘液,通过试验比较不同含水量绝缘纸在菜籽油基天然酯和矿物油中的加速热老化特性,并研究了氧气对绝缘纸在两种不同绝缘液中的加速热老化特性的影响。结果表明:在相同温度下,含水量是影响绝缘纸热老化速率的主要因素,氧气会降低菜籽油基天然酯对低含水量绝缘纸热老化速率的抑制作用。结合绝缘纸在绝缘液热老化过程中比强度与聚合度的实测数据,导出得到考虑含水量和氧气影响的绝缘纸纤维素分解反应数学模型,应用该模型可以对绝缘纸在绝缘液中的热老化过程和寿命进行预测。

水流作用下混凝土表面剪切力及其冲磨特性的试验研究

为了获得水流作用下混凝土表面剪切力和抗冲磨强度的变化规律,以水泥砂浆替代混凝土,设计制备环形试件作为研究对象,将一部分试件浸入1 mol/L的氯化铵溶液浸泡,以得到表层具有不同溶蚀程度的环形试件,再利用自主设计的水流冲刷试验装置,开展试件在不同条件下的水流冲刷试验,分析水流流速、含砂率和溶蚀程度等参数对试件表面剪切力的影响以及试件抗冲磨强度的变化。结果表明:水泥砂浆试件表面剪切力随流速和含砂率的增大而增大,且与流速的1.70次方成正比;溶蚀后试件的表面剪切力比未溶蚀试件有明显增加,随着溶蚀程度的提高,试件表面剪切力也有一定增加;试件抗冲磨强度随着溶蚀程度和冲刷流速的增大而降低。

体育硕士专业学位研究生就业困境及破解路径研究

为破解当前体育硕士专业学位研究生的就业困境,从就业形势、招聘要求、职业选择、就业观念方面进行分析,结果:当前体育硕士专业学位研究生就业困境主要与研究生个人能力、就业观念、市场岗位供给及培养过程等因素相关。个人层面:需加强自身能力,提升竞争优势;明确职业规划,改正就业观念。社会层面:需降低区域发展差异,促进体育产业发展;积极落实就业政策,建设健康就业环境。培养过程层面:需优化培养课程设置,强化专业知识培养;完善学校资源配置,健全就业规划指导。

单篇学术论文创新类型研究

[目的/意义]学术论文创新类型研究是剖析学术论文创新性的前提,是内容文本层面进行学术论文创新性识别与测度的基础。[方法/过程]在对学术论文的概念和属性阐释的基础上,基于文献调研法,进行总结归纳,从创新程度、研究内容、文献结构、重要表征形式4个角度对单篇学术论文创新类型进行划分,并从三维时间视角对单篇学术论文创新类型的作用过程进行系统探讨。[结果/结论]经过分类,最终得到3种创新程度(颠覆性、独创性、渐进性)、8种研究内容(理论、观点、主题、问题或对象、方法、数据、结论或事实、应用)、4种文献结构(基础描述、技术方法、结果结论、未来展望)以及2种重要表征形式(单要素、组合要素)的创新类型划分结果,进而提出创新类型研究对学术论文创新性评价的启示与应用价值。

Type 2 Diabetes—Hard to Select a Healthy Choice

Introduction: The use of foods containing high levels of sugar is increasing all the time. This is a risk factor for increased incidence of type 2 diabetes. There are few studies that have investigated the availability of low-sugar müsli products in grocery stores. Purpose: The study aims to identify which types of müsli contain high respectively low levels of sugar, and which brands are involved. Methods: The material consists of both qualitative interviews and observations from five grocery stores: City Gross, Hemköp, Ica Maxi, Stora Coop and Willy’s in Helsingborg, Sweden. The qualitative interviews had a semi-structured character and were recorded. The interviews took approx. 20 minutes and a textual analysis was conducted of the results. Data from observation was analyzed based on brand, nutritional composition and flavors, and also, where low sugar products were placed on store shelves. Results: The grocery stores provided together brands from AXA, Coop, Finax, Frebaco, Garant, ICA, Risenta, Saltå Kvarn och Urtekram, in total 24 müsli products. Of these products, 19 were high in sugar. The observation reveals that müsli products with high sugar content (17 - 29 g per 100 g müsli) are more prominently displayed than those with low sugar content. From the interviews with the store managers, it became clear that it would be valuable to highlight healthy müsli products on the shelves. However, central bureaucracy puts obstacles to such measures. Discussion: The study emphasizes the need for increased visibility of low-sugar products and proposes solutions such as negotiating with responsible person at the head office in Stockholm. Several reviews have shown that if the grocery store raises the prices of unhealthy food, the consumer is willing to purchase healthier müsli and other products. Conclusion: This study shows the need for grocery stores to upgrade healthy müsli products along with advertising to be able to influence customer’s shopping habits. Also, further research is needed how type 2 diabetes is affected by high intakes of food products with high sugar content.

纳米丁腈橡胶胶乳的制备与催化加氢

采用常规乳液聚合法结合低温间歇聚合工艺制备了丁腈橡胶胶乳,使用自制钌系催化剂对该胶乳进行乳液加氢,系统研究了催化剂用量和氢气压力对丁腈橡胶胶乳加氢效果的影响规律。结果表明,所制备丁腈橡胶胶乳的平均粒径为69.13 nm,加氢前后胶乳的粒径基本保持不变且胶乳稳定性良好;氢气压力越大催化加氢效果越好;当催化剂质量分数为0.017 5%时,可制得氢化度为99%以上且不含凝胶的产品。

44份三叶木通种质的果实性状及其与含油量的关联度分析

为了筛选三叶木通种质及明确不同果实性状与含油量、鲜食率的关系,为三叶木通育种提供参考,对44份三叶木通种质的油脂含量、鲜食率与7个果实性状进行相关性与关联度分析。结果表明:各果实性状变异系数10.74%~50.48%;三叶木通平均含油量达40.40%,含油量最高的是M002-1(53.88%),鲜食率最高是贵大3-2(39.50%);对含油量影响最大的是种子百粒重,对鲜食率影响最大的是果实横径。