Studies on hollownesss regulation and properties of crosslinked hollow phenolic fibers

The hollowness of crosslinked hollow phenolic fibers was regulated successfully from 9 % to 80 % by adjusting the curing temperature of the partially crosslinked fibers. The partially crosslinked fibers was studied in detail by mass gained, tensile strength, solvent dissolution, SEM, IR, and TG analysis, and the prepared hollow phenolic fibers with different degrees of hollowness were characterized with SEM, tensile strength, TG-DSC and TG-MS. The results show that the factor determining the hollowness is the crosslinked extent of the partially crosslinked fibers and the hollow fibers with different degrees of hollowness have similar crosslinkage, mechanical properties and thermal stability.     

PRA参与式方法探讨广西食用菌生产问题

运用参与式农村评估方法,探讨分析广西食用菌生产发展的现状、问题及对策,得出结论,提出建议。     

地方文化资源数字化保护与文化创意品牌塑造

以惠州龙门农民画产业化为例，惠州龙门农民画是以“南蛮文化”作为独特视角，展现南国传统民俗风情的民间绘画，被誉为世界民间艺术奇葩。分析了产业化发展进程中龙门农民画的艺术特色和文化价值，阐述了基于知识管理的龙门农民画数字化保护思路，并从文化创意角度对龙门农民画的文化品牌塑造进行了探讨。     

Transport of ova through the oviduct of merino ewes

Dissection of the heads of 12 male Red deer revealed that the innervation and blood supply of the antler resembles those in the goat, in that the infratrochlear and zygomaticotemporal nerves supply the antler pedicle accompanied by two main branches of the superficial temporal artery and vein. Analgesia of the antler should be produced by injecting local anaesthetic solution both dorsal to the orbital rim and immediately caudal to the zygomatic process of the frontal bone.     

地方文化资源数字化保护与文化创意品牌塑造

以惠州龙门农民画产业化为例,惠州龙门农民画是以"南蛮文化"作为独特视角,展现南国传统民俗风情的民间绘画,被誉为世界民间艺术奇葩。分析了产业化发展进程中龙门农民画的艺术特色和文化价值,阐述了基于知识管理的龙门农民画数字化保护思路,并从文化创意角度对龙门农民画的文化品牌塑造进行了探讨。     

浅论《孙子兵法》谋略思想对大学古代汉语教学的启示

《孙子兵法》这部我国古代最早最伟大的兵书,作为一种能激发学生兴趣的教学资源,它的理论在选择教师、教师做好授课前的准备、教学中采用灵活多样的授课方法等方面给古汉语教学提供了有益的启示。     

Physicochemical assessment and phosphorus storage of canal sediments within the Everglades Agricultural Area, Florida

Purpose

Excess nutrients such as phosphorus (P) transported from the Everglades Agricultural Area (EAA) in South Florida, USA, to downstream water bodies have been identified as contributing to trophic imbalances within the Florida Everglades. Decades of farming drainage from the EAA has led to accumulation of sediments in regional canals which may be transported to downstream ecosystems and act as potential internal source of P.

Materials and methods

Intact sediment cores were collected from three main conveyance and three farm canals within the EAA. Physicochemical assessment, mineralogy, P speciation, and storage were determined for surface and subsurface layers.

Results and discussion

The main conveyance canal sediments had higher total P (TP) concentrations (1,280?±?360?mg?kg^-1) than the farm canals (960?±?540?mg?kg^-1), while farm canal sediments showed higher organic matter content (28?C53?%) compared to the main canal (24?C27?%) sediments. The minerals found in main conveyance canal sediments were similar to those found in Lake Okeechobee. The labile KCl?CP fraction comprised <2?% of TP from all canal sediments, while NaOH?CPi (i?=?inorganic) fraction consisted of 1?C14?% of TP. The majority of P in the canal sediments was contained in the HCl?CP fraction (Ca?CP and Mg?CP), comprising >50?% of TP in the main and farm canal sediments. An estimated 73 metric tons (mt) of P was stored in the 0?C10-cm layer of the three main conveyance canals within the EAA boundary of which 57-mt P is reactive and potentially available for release at different time scales.

Conclusions

The EAA canal sediments are highly organic with low bulk density and susceptible of being transported to downstream ecosystems. Many factors can impact the potential release of the reactive stored P, including redox potential of sediments as well as the overlying water column P concentration. Further investigation of potential P release from these sediments is warranted.     

水稻褐飞虱抗性基因的初步定位

本文应用229对水稻SSR引物对来自野生稻的褐飞虱抗性基因进行定位,结果表明引物RM589和RM311在作图群体BC2F2中存在多态性.通过作图软件进行基因和分子标记位点的遗传连锁分析,褐飞虱抗性基因与引物RM589和RM311的遗传距离分别是9.8cM和11.9cM,并将其定位在第6染色体和第10染色体上.     

微量元素对餐厨垃圾厌氧发酵的影响实验

针对餐厨垃圾厌氧发酵效率和稳定性较低的问题,采用CSTR反应器在中温（37±1）℃下探究了微量元素Fe、Co、Ni、Se、Mo、W对餐厨垃圾厌氧发酵的影响。结果表明当水力停留时间为40d,有机负荷为3g/(L·d)时,添加微量元素溶液的处理组和未添加微量元素溶液的对照组的平均甲烷日产量分别为7.1、6.7L/d,两者的甲烷体积分数分别为62.7%和61.6%;当有机负荷为4g/(L·d)时,对照组甲烷体积分数下降为19.5%,而处理组稳定在60%左右,且对照组的pH值由7.35下降为5.24,厌氧发酵失败,而处理组的pH值保持在7.2左右,厌氧发酵仍能稳定运行。实验结果表明,微量元素能够在一定程度上提高餐厨垃圾厌氧发酵的产甲烷效率和稳定性。     

Co含量对CoAPSO-5分子筛膜制备的影响

采用原位水热合成法在多孔α Al2O3上制备了连续致密的CoAPSO 5分子筛膜,并考察了Co含量对成膜过程的影响机制。通过XRD、SEM及ICP检测,证明所合成的为致密、均一、无取向CoAPSO 5分子筛膜,同时分析了合成液中进入分子筛的Co含量及其对CoAPSO 5分子筛膜的晶形、厚度及完备性的影响,并通过气体渗透法验证所合成的分子筛膜为无缺陷的。