大学生心理危机成因及对策研究

近年来,心理健康教育在高校逐渐成为大学生日常教育和管理的重要内容和手段之一。对大学生常见的心理危机问题进行了深入探讨,分析了心理危机的成因,并在此基础上对解决高校大学生心理健康问题提出了几点建议。     

钠蒙脱土对木材胶粘剂酚醛树脂性能的影响

通过对木材胶粘剂酚醛树脂(PF)中加入纳蒙脱土(NaMMT)制成复合材料,经x射线衍射(XRD)、MALDI-TOF质谱分析、差示扫描(DSC)分析并经压板试验,结果表明,少量的NaMMT和PF混合时,X射线衍射(XRD)显示不能达到完全的剥离;MALDI-TOF质谱显示本研究中的酚醛树脂是三维结构,使得插层变得很困难;差示扫描量热法(DSC)曲线显示,NaMMT对PF树脂的固化有促进作用;加入少量的NaMMT能提高作为胶合板和木刨花板用胶粘剂的热同性酚醛树脂的耐水性,但没有显示出对干强性能的提高.     

建筑结构的可靠度诊断检测

通过对实际工程中结构可靠度问题的研究,分析了引起建筑结构可靠度降低的原因,指出了建筑结构可靠度诊断检测过程中应注意的问题,阐述了检测方法及其他多种因素对结构可靠度的影响,提出了建筑结构可靠度诊断检测的改进方法。     

Virulence of the Populations of the Whitebacked Planthopper, Sogatella furcifera Reared on Different Resistant Rice Varieties

ARC and ND colony were obtained by rearing the whitebacked planthopper (WBPH), Sogatella furcifera(Horvath), exclusively on ARC10239 (ARC, carrying resistance gene Wbph2) and N‘Diang Marie (ND, carrying resistance gene WbphS) till 15 generations. Taichung Native 1 (TN1) and Rathu Heenati (RHT) served as susceptible and resistant check, respectively. The results of electronic recording revealed that duration of salivation and X-waveform of the two colonies on their corresponding hosts was short while the duration of phloem ingestion was long. The amount of honeydew excreted by ARC and ND colony did not differ on their corresponding host varieties from TN1 and was much higher than that of RHT. The number of eggs laid on their host varieties and TN1 were significantly higher than that on RHT. No distinct change was observed for these two colonies in term of percentage of developed eggs. The nymph survival rate of ND colony on its selection host was 45.0%, significantly different from that on TN1(71.4%0) and RHT(21.0%), while that of ARCcolony was 68. 3%, not significantly different from that on TN1(77.5%), but much higher than that on RHT(22.6%).The nymphal development duration of these two colonies on the corresponding hosts was not different from that on TN1, but significantly shorter than that on RHT. In brief, these two colonies had almost adapted to their corresponding host varieties based on feeding and oviposition, but the nymphal survival rate of ND colony was still low.     

财务信息化对企业发展战略的影响

论述了企业信息化总体发展战略,分析了企业财务信息化建设的必要性,指出了进一步推动财务信息化建设面对的主要问题和难点,介绍了财务信息化系统取得的成效。建立财务信息化系统有利于更有效地集成财务或非财务信息,便于企业内部信息资源共享,从而达到减少成本资源浪费、加大内部监管力度的目的。     

超稠油掺水溶性乳化降粘剂降粘试验

针对辽河油田超稠油加热降粘工艺存在能耗过高的问题,在张一块超稠油井进行了掺活性水降粘工艺试验,结果表明,在30%含水率高凝稠油中添加0.0125%的LJ-2乳化降粘剂与LH-XIV复配后,使含水高凝稠油在管道静态混合器和油泵的剪切作用下,形成相对稳定的O/W型乳状液,当剪切速率超过20 s-1时,可以进行管道的乳化降粘输送.采用掺活性水降粘技术可减少燃料费用.     

密林熊蜂出归巢的初步观察

采用野外试验和观察的方法,进行产卵前、后熊蜂王、工蜂出房后但未成大群的蜂王和工蜂以及成群后蜂王、工蜂出归巢情况的研究。发现:产卵前蜂王40%蜂王不出巢,60%出巢但不归巢;产卵后的蜂王20%能归巢,80%不出巢;工蜂出房后但未成大群的蜂王和成群的蜂王不出巢,工蜂出归巢状况良好,熊蜂野外过夜现象普遍。     

PRRSV云南株的分离与鉴定

从云南某猪场采取病料经RT-PCR检测为猪繁殖与呼吸综合征病毒(PRRS)阳性,将其处理后接种到猪肺泡巨噬细胞(PAM)和Marc-145细胞上。接种后3 d,猪肺巨噬细胞开始出现细胞病变(CPE);Marc-145细胞盲传3代后,细胞也出现了CPE。对出现CPE的细胞培养物,用RT-PCR法、间接免疫荧光试验进行检测,结果均为PRRSV阳性;细胞培养物经PEG初步浓缩后,接种到PRRSV阴性,PRV、CSFV抗体阳性的仔猪,15 d后猪只出现体温升高并伴有食欲减退,精神不振等症状。采血并用同上的RT-PCR法检测,结果为阳性;采血用同上的RT-PCR法检测,结果亦为阳性;用电镜对纯化后的病毒进行观察,可见有囊膜包裹的圆形病毒粒子,其直径约为50 nm;间接免疫荧光实验可见黄色荧光;TCID50测定其毒价为10-4.75/0.1 mL。该病毒对氯仿、紫外线、酸碱度变化(pH5.0或pH7.5)和热敏感;结果表明,已成功分离获得一株PRRSV云南地方流行毒株,命名为YN-1。     

白发藓和大灰藓提取液对作物种子的影响

测定3种浓度梯度的白发藓、大灰藓的配子体水提液对绿豆、萝卜、甜椒、油菜、玉米5种作物种子的发芽率、胚根长、胚根重、幼苗鲜重等指标的影响。结果显示:3种不同浓度的白发藓提取液对作物种子的胚根长、胚根鲜重和幼苗鲜重均呈抑制作用;而大灰藓提取液对作物种子的胚根长、胚根鲜重和幼苗鲜重在高浓度下呈抑制作用,在低浓度下呈促进作用。2种苔藓提取液对作物种子萌发指标的影响力大小依次为:胚根长>胚根鲜重>幼苗鲜重>发芽率,胚根长是较好的生物测定指标,发芽率则是不敏感的生物测定指标。绿豆、萝卜和油菜是测定2种苔藓提取液对种子萌发影响力较好的实验材料。