PBL教学模式在烟草专业教学中的应用研究

PBL教学模式在医学类专业教学中已经取得了显著成绩。本研究以烟草专业教学为例探讨PBL在农学类专业教学中的效果。结果表明,PBL教学模式显著地提升了学生的知识掌握程度,并且提高了学生的求知欲,活跃了课堂气氛,开阔了视野,锻炼了学生们团队合作和PPT制作能力。理论联系实际的核心理念促使PBL教学模式将在农学类专业教学过程中发挥出更大的作用。     

加强县级烟草专卖局依法行政建设的若干思考

专卖专营制度是烟草行业赖以生存与发展的根本制度。随着中国加入世界贸易组织和《烟草控制框架公约》，作为烟草行业最基层的县级烟草专卖局，提高其依法行政水平，有利于适应烟草市场开放和全球化竞争的挑战，保护烟草专卖制度，维护国家利益和消费者利益。     

晾晒烟感赤星病后游离氨基酸含量的研究

不同品种晾晒烟接种赤星菌后,游离氮基酸含量也不同。随品种抗病性由弱到强,碱性、芳香族、杂环族三类基酸全病程病健比下降,酸性、脂肪族、侧链为非极性、侧链不带电极性四类氨基酸则上升,酪、赖、精、胱等氨基酸下降,苯、组、脯、蛋、谷、天、丝、苏、甘、缬、亮等氨基酸上升。品种抗性越强,苯、酪、赖、精、组、脯、胱等氨基酸上升越早,消减也越快。游离氨基酸总增值量也随品种抗性增强而增大。     

Children’s Reading Comprehension and Oral Reading Fluency in Easy Text

This study explored third-graders’ oral reading fluency (ORF) in easy text in relation to their third- and fourth-grade reading comprehension. It also examined the children’s performance on two different measures of text exposure, a self-report questionnaire and a title-recognition test. Although third-graders’ ORF related significantly to their reading comprehension, oral language comprehension accounted for most of the variance in reading comprehension, whereas single word reading speed accounted for most of the variance in ORF. Third-grade reading comprehension and ORF each predicted unique variance in children’s scores on a fourth-grade state-mandated reading comprehension assessment. Scores on the self-report questionnaire correlated significantly with third-grade ORF and fourth-grade reading; the self-report accounted for reliable variance in ORF even with all of the other reading ability variables entered first. Results are consistent with the viewpoint that text exposure affects reading fluency. They also demonstrate that ORF is a valuable predictor of middle-elementary children’s reading comprehension, even when the ORF measure employs very easy text in which children achieve near-perfect word accuracy.     

“Pick and choose” opinion climate: How browsing of political messages shapes public opinion perceptions and attitudes

ABSTRACT

High-choice media environments allow people to cocoon themselves with like-minded messages (confirmation bias), which could shape both individual attitudes and perceived prevalence of opinions. This study builds on motivated cognition and spiral of silence theory to disentangle how browsing political messages (both selective exposure as viewing full articles and incidental exposure as encountering leads only) shapes perceived public opinion and subsequently attitudes. Participants (N?=?115) browsed online articles on controversial topics; related attitudes and public opinion perceptions were captured before and after. Multi-level modeling demonstrated a confirmation bias. Both selective and incidental exposure affected attitudes per message stance, with stronger impacts for selective exposure. Opinion climate perceptions mediated selective exposure impacts on attitudes.     

原子吸收光谱法测定烟草中铅镉

采用硝酸-过氧化氢-氢氟酸混合酸微波消解法消解烟丝样品,以NH4H2PO4为改进剂,氘灯背景校正横向加热石墨炉原子吸收光谱仪测定铅、镉。方法测试铅、镉的检出限分别为0.735、0.041μg/L,回收率分别为98.81%、92.47%,铅质量浓度范围为3.5～40.0μg/L,镉为0.12～5.0μg/L时相关系数r分别为0.9976、0.9966。方法具有简单、快速、实用性好的优点,可用于实际烟草中铅、镉的测定,结果良好。     

模拟低氧训练对大鼠红细胞流变性的影响

目的:旨在观察2800m海拨高度的训练对大鼠血红蛋白及红细胞流变性的影响。方法:采用SD(Sprague-Dewley)大鼠40只,随机将其分为常氧常压组(LN),常氧常压训练组(LNT),低氧低压组(LH),低氧低压训练组(LHT)。LN、LNT组和LH、LHT分别置于正常海拔高度与相当于2800m的生活条件下,其训练环境同生活环境保持一致。LNT和LHT组分别在所控制的环境中,进行为期五周的训练。每周训练五天。结果:发现五周的低氧刺激或低氧训练,LH和LHT组的血红蛋白含量、红细胞压积和红细胞变形能力均显著升高(P<0.05),但LN和LNT组未发生显著变化。结论:五周的低氧刺激或低氧训练,均能提高大鼠机体内的血红蛋白含量、红细胞压积和红细胞变形能力,低氧刺激与低氧结合训练刺激所产生的效果并没有显著性差异。     

浅谈高职艺术专业摄影教学中需着重强调的几个问题

对学生的实际拍摄过程和作品分析发现,学生摄影作品中,艺术的体现的确存在相当程度的不足;在实际拍摄过程中,表现出的对单反相机驾驭操控能力的欠缺也普遍存在。目前摄影教学中表现出来的问题,不只是技术或者艺术哪一个单方层面的偏颇,过于推崇“技术流”或“艺术流”都是片面的,技术与艺术并重的“两条腿走路”才是应该提倡的教学和学习方法。     

烤烟散叶收购在工商交接环节的主要问题及其解决途径初探

随着烤烟收购模式的转变,工商交接方式也应与之相适应.就烤烟散叶收购在工商交接环节的主要问题进行了剖析,对与之相匹配的工商交接方式进行了深入的探讨,为烤烟散叶收购工商交接得以顺畅运行提供参考.     

西南区烟草新品系分类及适应性研究

为准确地鉴定西南区烤烟新品系在云南省昆明市寻甸烟区的适应性,给全国烟草品种的审定和区域化种植提供科学依据．2012年,寻甸试点采用随机完全区组设计,开展了以当地推广品种MSK326为对照,共计8个烤烟品种（系）的小区品比试验,并借助12项数量性状进行了聚类分析．结果表明：1）在烟草品种特征特性典型时期,根据数量性状可将8个参试品种（系）分为4大类,第1类包括CF224,MSK326,PVH1452和GY0802,表现为叶数有一定优势,叶片较窄;HB029单独为第2类,表现为植株较矮、叶数少、节距密,现蕾至中心花开放的间隔时间长;毕纳1号单独为第3类,表现为植株较高,叶数优势明显,叶片较长、较宽;第4类包括Ls-2与YN116,表现为节距稀,叶片较宽,营养生长期短,大田生育期较短．2）按其田间长势、自然发病程度、初烤烟叶外观质量及经济性状等综合分析,毕纳1号适应性最强,各项指标均优于或相当于对照MSK326．LS-2,YN116适应性中等,各项指标与对照MSK326相当．PVH1452,HB029和CF224适应性一般,各项指标差于或相当于对照MSK326．GY0802适应性最差,绝大多数指标均不如对照MSK326．