对教师个人多媒体教学平台的研究

多媒体教学技术被广泛地应用于教学,有效提高了课堂教学效率和教学质量。但过分或不当使用多媒体技术也会影响和制约着教学效果,限制教师主动性和禁锢教师临场发挥。有必要对这项技术在形式、手段和方法上进行一些反思,重新探讨教学中所需要的多媒体软硬件环境以及平台,研究适合高校教师使用的多媒体辅助教学平台及工具。     

鄂南洞茶史浅谈

叙述了鄂南赤壁青(米)砖茶的起源,并对羊楼洞砖茶生产历史、生产工艺进行了概述。     

厄贝沙坦及其复方制剂中痕量杂质N-亚硝基-N-甲基-4-氨基丁酸残留方法学研究

采用超高效液相色谱-三重四级杆质谱(UPLC-MS/MS)建立厄贝沙坦及其复方制剂中N-亚硝基-N-甲基-4-氨基丁酸(NMBA)的测定方法。采用Waters ACQUITY UPLC○RHSS T3色谱柱进行分离,以0.005 mol/L甲酸铵(用甲酸调pH值至3.0)为流动相A,甲醇为流动相B,梯度洗脱,质谱检测器,流速为0.3 mL/min。结果显示NMBA的线性范围为0.156 6~3.132 6 ng/mL,相关系数r>0.99,方法检出限浓度为0.047 0 ng/mL(相当于样品浓度0.01μg/g),定量限浓度为0.156 6 ng/mL(相当于样品浓度0.03μg/g),样品加标回收率在80%~130%。说明该方法可以快速、简便、灵敏、准确地测定厄贝沙坦及其复方制剂中NMBA含量。     

成长型饲料企业人力资源面临的问题及解决策略研究

企业的发展通常要遵循企业的生命周期理论,从企业最初创立进入生存期,到企业规模进一步增大进入成长期,再到企业成熟期和衰退期,每个生命周期阶段的生产经营和管理策略都有所不同。当企业进入成长期,其发展潜力进一步释放,生产销售数据呈现快速增长的趋势,企业的管理形式也逐渐趋向成熟。对于成长型的企业而言,人力资源管理水平和现状关乎着企业的发展速度和水平,是企业未来的战略资源。而成长型的饲料企业相比于大型、集团化企业,存在人才吸引力低、人才流失严重、人力资源管理水平低等问题,这会影响饲料企业的转型升级。因此,本文以饲料企业为研究对象,基于当前我国成长型饲料企业的发展历程和企业特点,深入分析饲料企业人力资源面临的问题,并针对性地提出解决策略,破除饲料企业人力资源对企业发展的限制,帮助企业进一步健康发展。 [关键词] 成长型饲料企业|人力资源|问题|解决策略     

乳酸锌对断奶肉兔生长性能、肠道发育和血清生化指标的影响

本试验旨在研究饲粮中添加乳酸锌对断奶肉兔生长性能、肠道发育和血清生化指标的影响。选择28日龄同期断奶新西兰兔420只,随机分为5组:对照组(饲喂基础饲粮,饲粮中添加硫酸锌形式的锌0 mg/kg)、硫酸锌组(在基础饲粮中添加硫酸锌形式的锌80 mg/kg)以及3个乳酸锌组(在基础饲粮中分别添加乳酸锌形式的锌20、40、80 mg/kg),每组14个重复,每个重复6只(公母各占1/2)。预试期7 d,正试期42 d。结果表明:1)与对照组相比,饲粮中添加40和80 mg/kg乳酸锌可以显著提高断奶肉兔的试验末重和平均日增重(P<0.05),显著降低料重比、腹泻率和死亡率(P<0.05),但对平均日采食量无显著影响(P>0.05);40 mg/kg乳酸锌组肉兔的试验末重、平均日增重和料重比与硫酸锌组差异不显著(P>0.05),但腹泻率和死亡率较低。2)与对照组相比,饲粮中添加40和80 mg/kg乳酸锌可以显著提高断奶肉兔小肠绒毛高度和绒毛高度/隐窝深度(P<0.05),显著降低十二指肠隐窝深度(P<0.05);80 mg/kg乳酸锌组肉兔十二指肠绒毛高度显著高于同水平硫酸锌组(P<0.05)。3)与对照组相比,饲粮中添加40和80 mg/kg乳酸锌可以显著提高断奶肉兔血清抗氧化酶活性及生长激素和胰岛素样生长因子-Ⅰ含量(P<0.05);40 mg/kg乳酸锌组肉兔血清生化指标与硫酸锌组差异不显著(P>0.05),80 mg/kg乳酸锌组在提高肉兔血清铜锌超氧化物歧化酶活性和生长激素含量方面优于同水平硫酸锌组。综上所述,饲粮中添加乳酸锌可以促进肉兔生长、降低腹泻率和死亡率、改善血清生化指标和肠道发育;乳酸锌的添加效果显著优于相同水平的硫酸锌,养兔生产中乳酸锌适宜添加水平为40 mg/kg。     

不同来源纤维饲粮对福建黄兔表观消化率、十二指肠组织形态及盲肠纤维消化酶活性的影响

本试验旨在研究不同来源纤维饲粮对福建黄兔表观消化率、十二指肠组织形态及盲肠纤维消化酶活性的影响。试验选用200只健康、体重接近的断奶福建黄兔,随机分为4组,每组5个重复,每个重复10只。4组分别饲喂由添加比例为25%的苜蓿草粉、甜菜渣、燕麦草、大麦糠为纤维饲料原料配制而成的饲粮。试验期为60 d,于试验第54天以全收粪法进行消化试验,屠宰后测定十二指肠绒毛高度、隐窝深度及二者比值,盲肠纤维素酶、半纤维素酶和果胶酶活性。结果表明：①苜蓿草粉与甜菜渣组的中性洗涤纤维（NDF）、酸性洗涤纤维（ADF）、不溶性纤维（IDF）、可溶性纤维（SDF）的消化率均极显著高于大麦糠与燕麦草组（P<0.01）。其中,甜菜渣组不溶性纤维、可溶性纤维的消化率最高,与苜蓿草粉组差异显著（P<0.05）。②苜蓿草粉与甜菜渣组的绒毛高度极显著高于大麦糠组（P<0.01）,但显著低于燕麦草组（P<0.05）,隐窝深度显著低于大麦糠和燕麦草组（P<0.05）,其中甜菜渣组隐窝深度最低。甜菜渣组的绒毛高度/隐窝深度（V/C）最高,极显著高于其他组（P<0.01）。③苜蓿草粉与甜菜渣组盲肠3种纤维消化酶活性均极显著高于大麦糠和燕麦草组（P<0.01）,其中甜菜渣组的3种酶活均极显著高于苜蓿草粉组（P<0.01）。综上所述,对比4种纤维饲粮,在饲粮配方中添加25%的甜菜渣能提高肉兔的表观消化率与盲肠纤维消化酶活性,并能改善十二指肠组织形态。     

基于SWAT模型的西江流域径流模拟研究

采用SWAT(Soil and Water Assessment Tool)模型,在整个珠江流域构建分布式水文模型,对西江流域1951~2008年的月径流过程进行模拟。选取西江流域的迁江、柳州、武宣3个水文站的径流数据,利用SWAT模型自带的敏感性分析模块和自动率定模块,采用LH-OAT敏感性分析方法和SCE-UA算法分别对选取的各参数进行敏感性分析和参数率定,并对率定模型进行验证。敏感性分析结果表明,不同的参数对流域月径流过程表现出不同程度的敏感度,其中CN2、ESCO、SOL_AWC、CH_K2和ALPHA_BF的敏感度较高,是较敏感因子。从率定和验证结果来看,3个水文站的径流模拟效果均较好,Nash-Suttcliffe效率系数ENS均在0.75以上,其中柳州站和武宣站率定期和验证期的ENS在0.8以上。SWAT分布式水文模型在西江流域月径流模拟中的应用效果良好。     

Effect of Aerosol OT and Paraformaldehyde Supplement on the Voluntary Intake,Digestion and Metabolism of Late-pregnant Ewe Fed with Ground Diet

The Small-tail Han ewes with 3 years old, (48.7±2.0)kg body weight, carring the multi-lamb gene, were fed with the same diet, mating after one month.18 pregnant ewes were selected and divided into 3 groups(groups 1(control group), 2 and 3).From 90 days of pregnancy, groups 2 and 3 were supplemented with aerosol OT(800 mg/kg) and paraformaldehyde(300 mg/kg), respectively, and the experiments of digestion and metabolism were carried on from 121 to 130 days of pregnancy to study the effect of aerosol OT and paraformaldehyde supplements on the voluntary intake, digestion and metabolism, lambing of late-pregnant ewes.The results showed that when fed with aerosol OT, the voluntary intake of dry matter was increased by 13.0%(P<0.01);The amount of digestion of DM, OM, CP, cellulose and GE was increased by 12.4%(P<0.05), 14.4%(P<0.01), 23.2%(P<0.01), 15.2%(P>0.05) and 27.4%(P<0.01), respectively;The retention of N, Ca and P was increased by 31.1%(P<0.01), 48.5%(P<0.01) and 31.9%(P<0.01), respectively;The serum triglyceride and free fatty acid content tended to decrease;but the apparent digestibility of the dietary nutrients were not significantly affected(P>0.05);The loss of ewe postpartum weight was reduced by 61.9%(P<0.01), a nest of lamb weight was increased by 4.2%(P>0.05).In the condition of feeding paraformaldehyde, the voluntary intake of dry matter was increased by 12.6%(P<0.01);The amount of digestion of DM, OM, CP, cellulose and GE was increased by 15.4%(P<0.01), 16.2%(P<0.01), 22.4%(P<0.01), 14.2%(P>0.05) and 29.0%(P<0.01), respectively;The retention of N, Ca and P was increased by 33.5%(P<0.01), 48.9%(P<0.01) and 36.3%(P<0.01), respectively;But the apparent digestibility of the dietary nutrients were no significantly affected(P>0.05);The serum β-hydroxybutrate and free fatty acid content tended to decrease;The loss of ewe postpartum weight was reduced by 57.1%(P<0.01), a nest of lamb weight was increased by 11.1%(P<0.05).This study showed that by feeding aerosol OT or paraformaldehyde, the intake, digestibility of Ca, P and N could be improved in late-pregnant ewe, the body weight loss, body fat mobilization could be reduced, and the birth weight of litter could be increased.     

Cloning and Sequence Analysis of HA and NA Genes of One Strain of H6N6 Subtype Avian Influenza Virus Isolated from Guizhou Province

To investigate the epidemic situation of H6N6 subtype avian influenza virus (AIV) in Guizhou province,A/duck/Guizhou/013/2014 was isolated from Sansui duck in live poultry market of Guizhou in 2014,the hemagglutinin (HA) and neuraminidase (NA) genes of DK/GZ/14 were subjected to clone and sequence analysis.The results showed that HA gene had the highest nucleotide homologies (97.5%) with the duck-origin H6N6 subtype AIV isolated from Eastern China in 2009,and the strains of HA gene proteolytic cleavage sites was P-Q-I-E-T-R-G,which accordeol with the molecular characteristic of low pathogenic AIV (LPAIV).However,NA gene of A/duck/Guizhou/013/2014 had the highest nucleotide homologies (98.2%) with the duck-origin H6N6 subtype AIV isolated from Fujian in 2007.The phylogenetic tree showed that A/duck/Guizhou/013/2014 and Hunan strains located in the same branch,while three duck-origin H6N6 subtype AIV isolated from Guizhou in 2007 and A/duck/Guizhou/013/2014 located in the different branch for HA and NA genes in genetic evolution,which suggested that A/duck/Guizhou/013/2014 was far with the local H6N6 subtype.The results also clearly indicated that duck-origin H6N6 subtype AIV had genetic diversity in duck population in Guizhou.     

SrNi2Fe16O27铁氧体的合成与性能研究

采用柠檬酸法合成出超微W型铁氧体。用XRD、VSM测试其结构和磁性能。试验结果表明,该法在1000℃制得的铁氧体性能优于其他方法制得的铁氧体,控制pH值、水量和柠檬酸的量对铁氧体的结构和磁性能都有一定的影响。