基于模糊综合评价的厦门港航道危险度评估

针对厦门港港口航道的交通安全状况,利用模糊综合评判法对该航道进行危险度的判断.并结合厦门航道的实际情况,将评价系统分为若干个指标,在船舶AIS数据挖掘研究的基础上,建立航道的危险度评估系统,对厦门港口的三段航道进行危险度评判.实践证明该评估系统是可行的.     

优质蜜环菌菌株的初步筛选

为了筛选出优质的蜜环菌菌株供猪苓的生产应用,比较了20株蜜环菌菌株的生长速度、菌索分枝、菌索直径、韧性以及菌丝的蕈香味等生物学特性。结果表明:菌株AM-06、AM-08、AM-12和AM-13均表现出优良的生长性状,表现在有大量的白色菌丝,萌发和生长较快,菌索分枝较多,尖端幼嫩,菌索粗壮,韧性极好,菌索长满平皿后有浓郁的蕈香味。     

引入耕地生态价值的咸阳市基本农田划定

为了探索科学客观的基本农田划定方法,实现将集中连片和优质稳定的耕地划为基本农田的目标,有效保护耕地和保障国家农业生产安全。该研究以陕西省咸阳市为例,引入耕地生态价值和政策条件多维度评价耕地质量,结合耕地质量空间集聚类型划定耕地保护分区;采用缓冲区分析法识别耕地连片性,耦合耕地保护分区和耕地连片等级,尝试探索“连片优先、质量优良、数量约束”的基本农田划定流程。结果表明:1)咸阳市耕地质量划分为高、较高、一般、较低、低5个等级,全市超过一半面积的耕地质量等级为低和较低等级(35.81%和29.67%),一般和较高等级的耕地面积占比也均超过了10%;不同耕地质量等级在空间分布上的差异受地形和区域经济发展影响较大,耕地质量等级总体上呈现出“南高北低”的空间分布格局;咸阳市耕地质量在空间上呈现出明显的集聚特征,以高-高值集聚型和低-低值集聚型耕地为主;2)将全市耕地划为优先保护区、适宜保护区、重点整治区和全面治理区4个保护分区并提出一些保护建议。全面治理区内耕地面积最多,占全市耕地总面积的35.50%,适宜保护区内耕地面积最少,仅占11.81%;3)咸阳市共得到49 713个耕地连片地块,面积2...     

图书馆业务外包的核心问题——保证服务质量和水平

在图书馆业务外包环境下,如何保证服务质量这一关键性问题作出了一些探讨。     

Changes in NMR Relaxation of Rice Grains,Kernel Quality and Physicochemical Properties in Response to a High Temperature after Flowering in Heat-Tolerant and Heat-Sensitive Rice Cultivars

Abstract

Rice productivity is related to the ability of plants to adapt to heat stress. The heat-tolerant cultivars ‘Nikomaru’ and ‘Chikushi 64’ and heat-sensitive cultivar ‘Hinohikari’ were grown at 30ºC and 25ºC for 49 days after flowering. At 30ºC, only a few white immature kernels were produced in ‘Nikomaru’ and ‘Chikushi 64’, but about 22% of grains had immature kernels in ‘Hinohikari’. The high temperature(30ºC) caused no significant changes in grain dry weight, water content, and the NMR T₁ value during the early ripening stage in ‘Nikomaru’ and ‘Chikushi 64’. It also did not affect grain development, especially with respect to the nucellar epidermis, in ‘Nikomaru’ and ‘Chikushi 64’, but caused clear cessation of development of the nucellar epidermis at 14 days after flowering in ‘Hinohikari’. In addition, high temperature decreased the amylose content and increased hardnessvs. adhesion ratio of cooked rice in both ‘Nikomaru’ and ‘Chikushi 64’ resulting a softer, less sticky texture, but not in ‘Hinohikari’. The maximum viscosity and breakdown values were increased, and final viscosity decreased at 30ºC in all three cultivars. These results suggested that starch in the endosperm of grains changed from a fluid state to a doughy state more slowly in ‘Nikomaru’ and ‘Chikushi 64’ than in ‘Hinohikari’, in which the water content and NMR relaxation time decreased, and transported assimilates accumulated slowly during grain development.     

不同基因型谷子品种(系)对干旱胁迫的响应及抗旱性评价

旨在为旱区谷子生产及抗旱育种提供理论依据。以10个谷子品种(系)为研究对象,采用管栽试验,研究了干旱胁迫对不同基因型谷子生长及产量相关性状的影响。结果表明,在干旱胁迫条件下,参试的10个谷子品种(系),叶绿素含量下降的幅度为4.90%~33.11%,株高降低的幅度为9.56%~30.93%,穗长减小的幅度为5.58%~30.90%,穗粗减小的幅度为3.42%~16.34%,单穗重降低的幅度为7.30%~45.71%,单穗粒重降低的幅度为11.83%~54.72%,出谷率降低的幅度为4.89%~16.60%。抗旱性评价结果表明,‘冀谷31’、‘沧谷5号’、‘冀谷19’等3个品种的抗旱性较好。     

追施不同形态氮肥对不同钾效率基因型棉花生长及产量品质的影响

【目的】探讨高、低供钾水平下,追施氮肥形态对棉花生长、钾素吸收利用以及产量、品质的影响。【方法】选择钾高效棉花品种辽棉18、冀棉958和钾低效棉花品种新棉99B为材料,进行营养钵培养试验,设置38.01mg·kg~(-1)和152.24 mg·kg~(-1)两个供钾水平,追施铵态氮肥(硫酸铵)和硝态氮肥(硝酸钙)两种形态氮素肥料。【结果】供钾不足会降低棉花果枝始节和单株成铃数,高钾处理棉花干物质积累量、钾累积量、钾利用指数以及产量显著高于低钾处理;与追施硝态氮肥相比,追施铵态氮肥会降低棉株高度、果枝数和单株成铃数,减少籽棉产量和总干物质积累量;追施铵态氮肥处理棉花对钾素的吸收和利用显著低于追施硝态氮肥处理。【结论】钾低效基因型品种棉花在钾素供应不足时对追施铵态氮肥更敏感,且棉花成熟越晚受到追施肥料氮素形态影响越大。     

云南甘蔗杆状病毒的分子检测及其对甘蔗品质和产量的影响

 Sugarcane bacilliform virus(SCBV) was detected by PCR from sugarcane showing chlorosis and mottle symptom from Kaiyuan, Yunnan Province.Part sequence of replicase gene of the isolate SCBV-Kaiyuan was determined.Sequence analysis indicated that the 589 bp of SCBV-Kaiyuan shared identities of 73.2%-74.0% and 83.1%-84.1% at nucleotide and amino acid levels with SCBV-Australia respectively, 66.7%-68.4% and 65.6%-67.7% with SCBV-Morocco.The quality and yield of the sugarcane infected with SCBV-Kaiyuan was also investigated.The juice extraction, sucrose content, gravity purity and average stalk weight were decreased 1.55%, 1.24%, 2.22% and 0.26 kg in plants infected with SCBV-Kaiyuan, but reducing sugar was increased by 0.21% in infected plants.     

风景区自然景观资源评价及合理开发

文章以庐山风景区为例,对自然景观资源进行了分类与分级评价,并依据评价的结果及当前风景区自然景观资源的开发利用现状,提出了庐山风景区自然景观资源进一步科学开发与管理的合理化建议,以期为今后庐山风景区自然景观资源的可持续发展提供一定的理论参考。     

对保证学生评教质量的思考

学生评教是教育评价体系中重要的构成部分，为保证学生评教质量，应建立科学完善的学生评教指标体系，选用科学的学生评教实施方法。