云联众家团购网在高校开展的可行性研究

云联众家团购网作为众多电子商务平台中的一个,在其行业发展中,也已经实现了对 大学生消费渗透。本文以福州外语外贸为例,对云联众家团购网在高校开展的可行性研究进行 了分析,旨在本文研究帮助下,能够更好地为云联众家团购网高校推广提供参考。     

农业废弃物再燃脱硝特性试验

为了缓解化石能源的不足,开发生物质清洁高效燃烧的利用方式,采用农业废弃物(稻壳、秸秆)和R90煤粉作为再燃燃料在恒温沉降炉上进行再燃脱硝试验。针对燃料种类、化学计量比(stoichiometric ratio)、停留时间、燃料粒度、再燃比等因素对再燃脱硝效率的影响进行了研究。结果表明:农业废弃物(秸秆、稻壳)的再燃脱硝能力明显高于煤粉,其中秸秆再燃脱硝效率最高,稻壳再燃脱硝效率中等,煤粉最低,不同的挥发分含量是造成农业废弃物(秸秆、稻壳)与煤粉再燃脱硝率差别的最主要原因。再燃脱硝率随再燃区化学计量比(SR2)的提高逐渐降低。SR2增加,燃料热解析出的还原组分被氧竞争性地消耗,导致NO还原反应弱化,再燃脱硝率降低。SR2对农业废弃物秸秆和稻壳再燃脱硝率影响明显强于煤粉,再燃比20%工况,SR2从0.8增加到0.9,秸秆再燃脱硝率减少了20.12%,稻壳减少20.07%,煤粉减少了8.38%。燃料粒度的改变将影响颗粒的升温过程,在相同条件下,较细的燃料颗粒能更快速释放出更多的挥发分,可以提供再燃还原NO所需的更多的还原物质,对提高再燃脱硝率是有利的。再燃停留时间增加,在富燃料条件下再燃燃料与NO的反应时间延长,有利于NO消减。采用农业废弃物秸秆、稻壳作为作为再燃燃料,合理的再燃停留时间在600 ms以内,明显低于煤粉。通过调整再燃比可以获得适合的再燃脱硝率,农业废弃物秸秆、稻壳的合理再燃比在15%~20%之间。     

西南桦在广东省中部引种初报

西南桦是我国热带、南亚热带地区的优良乡土阔叶树种。文章对广西壮族自治区11个西南桦种源在广东省中部引种的苗期及幼林生长性状进行了分析,结果表明:引种西南桦的地径、苗高以及幼树高生长在种源间、家系间差异极显著,种源内遗传变异大于种源间,家系遗传力高于种源。依据苗期地径选择出表现良好的5个种源,在其中选择出35个优良家系,遗传增益为14.59%;根据苗高在5个优良种源中选择20个优良家系,遗传增益达到21.27%。幼林阶段高生长与苗期略有变化,根据幼树高生长指标在5个优良种源中进一步选出25个优良家系,遗传增益达到10.03%。     

龙栖山自然保护区经济发展现状与对策

龙栖山自然保护区是国家级动植物保护区。在分析保护区内经济发展措施和制约发展的因素基础上,提出促进自然保护区经济进一步提升的策略,为当地政府部门制定保护区发展规划提供参考依据。     

抗菌药物联合应用对霉形体的药效学研究

本研究采用试管肉汤稀释法和棋盘法测定了１７种抗菌药物单独或几种药联合对鸡败血霉形体Ｓ＿６株（ＭＧＳ＿６）的最低抑菌和最低杀菌浓度．结果表明，ＭＧＳ＿６对北里霉素、四环素、红霉素、氟哌酸等高度敏感；四环素类与ＴＭＰ联合呈现协同作用。对实验性感染ＭＧＳ＿６的病鸡进行联合用药治疗试验，初步筛选出几个有良好治疗作用的联合用药配方。本研究是对联合应用抗菌药物治疗实验性鸡败血霉形体病进行的初步探讨，对防治本病具有一定的理论与实践意义。     

登云高尔夫球场草坪建植中的主要危害杂草

１９９４年５月对登云高尔夫球场草坪建植中发生的主要杂草种类及动态分布进行调查，记录了３２种数量较大的主要杂草，其中夏季主要以禾本科及莎草杂草为害，秋季主要菊科，蓼科，藜科等阔叶杂草，空心莲子草，香附子等多年生杂草夏，秋季均为害严重，草坪床上土构成及湿度影响草坪杂草的种类分布。     

酚醛树脂的改性

用ＤＳＣ分析技术研究了改性树脂的固化过程，确定了最佳固化温度。且发现随甲醛／苯酚的用量摩尔比增加。固化温度有下降的趋势；对改性树脂进行了力学性能测试，同时与普通酚醛树脂进行了比较。结果表明，实验合成的改性树脂的粘结性及柔性性较普通酚醛树脂有明显改善。     

Immunolocalization of steroidogenic enzymes in the corpus luteum and placenta of the Japanese Shiba goat

In this study, we performed immunohistochemistry of cholesterol side-chain cleavage cytochrome P450 (P450scc), 3beta-hydroxysteroid dehydrogenase (3betaHSD), cytochrome 17alpha-hydroxylase P450 (P450c17), and cytochrome P450 aromatase (P450arom) in the corpus luteum and placenta of Shiba goats. The aim was to clarify the steroidogenic capability of the corpus luteum and placenta of Shiba goats. Ovaries containing corpora lutea were obtained from four adult Shiba goats during the luteal phase (day10; n=2) and pregnancy (90 and 120 days of gestation). Placenta was obtained from one Shiba goat on day 120 of gestation. The sections of the ovaries and placentae were immunostained using the avidin-biotin-peroxidase complex method (ABC) with polyclonal antibodies generated against steroidogenic enzymes of mammalian origin. All luteal cells expressed P450scc, 3betaHSD, P450c17 and P450arom. The distribution of P450scc, 3betaHSD, P450c17 and P450arom were not different during the luteal phase and pregnancy. P450arom showed a weak positive staining in late pregnancy (120 days). In addition, immunoreactions for P450c17 and P450arom were observed in syncytiotrophoblast of the placenta of one Shiba goat. These results indicate that, in Shiba goats, corpus luteum is not only an important source of progesterone but also has the ability to synthesize androgen and estrogen during the luteal phase and pregnancy. Also the placenta has the ability to synthesize androgen and estrogen in late pregnancy.     

Male Pseudohermaphroditism in a raccoon dog (Nyctereutes procynoides)

A wild raccoon dog (Nyctereutes procynoides) which died due to a traffic accident on 18 October 2001, and was determined to be 4.5 years old, was examined. Visual appearance of the external genitalia in this animal showed to be female with a large penis-like clitoris protruding from the vulvar juncture. Visual examination of the internal genitalia revealed that the animal possessed both testes and uterus. Histological appearance of the removed gonads showed only Sertoli cells but no spermatogenesis. Using polymerase chain reaction with skin biopsy directed against the sex-determining region on the Y chromosome (SRY) gene, the genomic SRY gene was expressed as a single band and sequenced. Based on these findings, this raccoon dog was diagnosed as male pseudohermaphrodite.