射线衬比造影测定建柏等种子发芽率研究

本文应用软X—射线衬比造影对建柏、马尾松、杉木和柳杉种子进行发芽率测定,根据衬比剂渗透量、胚和胚乳等在X光胶片上的成像特征和定位发芽（对照）的比较研究结果制定判别等级。建柏种子分为10级,马尾松9级,杉木11级,柳杉10级。并按上述分级标准判读出每个树种不同产地种子各等级粒数,用统计分析方法确定判别有无发芽能力等级。结果表明Ⅰ、Ⅱ和Ⅲ级为有发芽能力,Ⅳ,级以后为无发芽能力。再经回归分析,建立校正模型,计算出准确的发芽率。     

先秦儒家和谐思想及其当代价值

先秦儒家的和谐思想是中华民族传统文化的重要组成部分,其在先秦儒家的整个思想体系中居核心地位。在构建和谐社会的今天,面对现代社会严重的生态危机、社会危机、精神危机,挖掘先秦儒家和谐的思想精髓,对实现人自身、人与人、人与社会、人与自然的协调发展有重要的现实意义。     

荷尔德林诗观浅论——兼析其对中国现代诗歌现状的启示

本文主要以荷尔德林的诗歌、论文、书信与哲学体小说《许佩里翁》为文本依据, 对荷尔德林的诗学观点予以述评; 并比照荷尔德林的诗观, 从中国现代诗歌的内涵与形式两个层面, 对中国现代诗歌缺乏审美特性的现状予以解析。     

小型无人机低空摄影测量在土地确权应用中的探究——以陕西试点区域为例

低空摄影测量具有成本低、效率高、时效性强、周期短、灵活性强的优点,能够高效率地获取高分辨率的影像,从而对地表进行快速、实时地调查和监测。以陕西三试点区域为例,应用小型无人机获取高分辨率影像,将此影像利用INPHO全数字摄影测量工作站中的Match AT光束法平差软件进行空三加密与计算,并利用航天远景Map Matrix立测软件进行基本定向点及检查点的精度检查,最终生成高精度的数字正摄影像底图。为了验证此无人机低空摄影测量的时间效率和结果精度,首先将此数字正摄影像底图的精度与传统航测法土地确权的精度指标进行比较与分析,得出此小型无人机低空摄影在土地经营权确权中具有很强的可行性与实用性,然后选用特定数量的影像数量重复执行此工艺过程并对过程进行时间统计,从而在总体工作量很大并保持稳定的情况下,验证了此无人机低空摄影在时间效率上的高效性,最后选用空三完成后影像上明显加密点坐标与实际量测坐标进行比较,得出结果精度满足较大比例尺的测绘成图。     

当代大学生思想政治教育认同实证分析

基于主体对认同对象和认知内容效果的评价角度,利用大规模问卷调查数据分析发现,当代大学生思想政治教育认同状况喜忧参半。一方面,思想政治教育对于大学生具有一定的积极影响,大学生对于相关核心思想政治观念具有较高的认同度。另一方面,大学生对于教育者的教学能力和教学效果认同度不高,思想政治理论课面临着“学生厌学、教师难教”的尴尬局面,大学生自身思想道德和政治素质不高、马克思主义信仰较为缺失。必须通过宏观、微观等多种途径以及教育者和受教育者等多方共同努力,改善大学生信仰状况及其对社会主义核心价值观的认同状况,提高其思想道德和政治素质。     

Probabilistic large‐area mapping of seagrass species distributions

• 1. Aerial photograph classification was used to map perennial thick canopy seagrass presence/absence over a large area (85 km²) off the coast of Western Australia. Within those areas mapped as seagrass, a geostatistical nonparametric interpolation method was applied to map the probability of seagrass species presence from underwater tow video. Multiple species mixtures were mapped at fixed probability thresholds of 0.95, 0.75, 0.50, and 0.25. Taxa included Amphibolis spp., Posidonia coriacea, P. sinuosa, P. australis and ephemeral species (Halophila and Zostera tasmanica (newly named as Heterozostera polychlamys)).
• 2. The most commonly occurring species were respectively Amphibolis spp., Posidonia coriacea, P. sinuosa, P. australis, and the ephemeral species. Amphibolis, P. coriacea, and the ephemeral species were mapped predominantly as mixed assemblages (71–89% mixed), whereas P. sinuosa and P. australis were typically mapped as single species.
• 3. Different species growth habits led to distinctive differences in large area distributions. All species were highly variable over short distances (<500 m), and spatial dependence persisted over more than 5 km. However, Posidonia sinuosa meadows were oriented with the longest axis running north–south, and a shorter axis running east–west perpendicular to the coastline (spatial dependence to 2.8 km and 0.8 km, respectively). The ephemeral species were less successfully mapped, largely owing to the potentially different growth patterns of the grouped species, and because their full extent could not be captured by the aerial photograph classification.
• 4. The individual biology of each species results in unique landscape features where Posidonia sinuosa forms larger continuous and predominantly monospecific meadows, whereas the more common Amphibolis and P. coriacea form multi‐species patchy meadows. These mapped features suggest that the emergence of species patterns in seagrass landscapes is influenced by differences in clonal growth among seagrass species.
• 5. Probabilistic species mapping provided information unavailable from discretely classified maps, and facilitates targeted sampling for improving map accuracy, and for more realistically evaluating species and mixed species distribution predictions. The kriging approach, although not well suited for all types of vegetation data, performed well for clonal seagrasses.

Copyright © 2006 John Wiley & Sons, Ltd.     

Anterior and posterior segment photography. An alternative approach using a dSLR camera adaptor

Purpose To describe a novel digital single lens reflex (dSLR) camera adaptor for anterior and posterior segment photography. Methods The adaptor was used to evaluate canine, feline, and equine patients presenting to Tufts Ophthalmology service. Anterior segment imaging was conducted with the adaptor mounted between a dSLR camera body (Canon 7D) and a macro lens (Canon EF‐S 60mm/f2.8). Posterior segment imaging was performed with the aid of an indirect ophthalmic lens mounted in front of the macro lens. Coaxial illumination during viewing was provided by a single white light‐emitting diode (LED) within the adaptor, while illumination during exposure was provided by the pop‐up flash or an accessory flash. Corneal and/or lens reflections were eliminated using a pair of linear polarizers, having their azimuths at right angles to one another. Results This dSLR camera adaptor provides quality high‐resolution, reflection‐free, images of both the anterior and posterior segments. It was easy to transport, assemble, and handle. The necessary adjustments, positioning, and focusing required for quality images were easily performed. Conclusion The described dSLR camera adaptor provides an alternative to existing imaging systems. High‐resolution image acquisition occurred at a fraction of the cost of established imaging system, particularly those devoted to the posterior segment.     

Sonoanatomy of female reproductive organ of Sunda porcupine (Hystrix javanica)

The conventional anatomical study of specimens requires cutting processes which destruct the limited specimens. A non-destructive method, namely an ultrasonography, can be used to assess the anatomical organ information of those specimens. The aim of this research is to analyse the macroanatomy of the female reproductive organ in the Sunda porcupine (Hystrix javanica), using ultrasonographical imaging. In this study, four formaldehyde-fixed reproductive organ specimens of the Sunda porcupine were used. A 10–12 MHz linear ultrasound transducer was utilized to provide an imaging format of both longitudinal and transversal views. Photographic images were then used as comparison with a sonographic image. The results show that the ultrasound image of the Sunda porcupine reproductive organ soft tissue was hypoechoic, the lumen and antrum follicles were anechoic, while atretic follicles and the mons pubis were hyperechoic. Generally, the size of the organ was not significantly different between photographical and ultrasonographical imaging (p > .05). In conclusion, ultrasound images can be utilized for anatomical studies of the Sunda porcupine reproductive organs without destructing the specimen.     

论"中国特色社会主义事业的建设者"的内涵及意义

从当代中国社会阶层分化这一动态过程中分析了"中国特色社会主义事业的建设者"概念的提出依据、科学内涵及现实意义。     

Evaluation of the suitability of arable fields for field trials by means of remote sensing

Summary The use of aerial photography for mapping the heterogeneity of trial fields was evaluated by comparing the pattern of infrared reflectance of a barley field with its spatial pattern for grain yield.The regression of yield on the infrared reflectance factor of barley appeared to be linear (correlation coefficient of 0.90). The high correlation encountered in this study justified the use of reflectance factors for estimating yield and it rendered aerial photography a good technique for mapping heterogeneity.Two kinds of maps were created in order to locate the heterogeneous parts of the field studied. One map was used for visualizing global heterogeneity and the other for visualizing local heterogeneity. These maps showed that trials performed on this particular field might be improved by using only parts of the field and by altering the shape of the blocks. The latter assertion was confirmed by field trials simulations.