运用回归分析测算水口镇商业用地基准地价

惠州市惠城区水口镇原隶属于惠阳市,2003年惠城区行政区划进行了战略性调整,惠阳撤市设区,水口镇划归惠城区管辖, 这样水口镇现执行的基准地价标准(原惠阳标准)需要更新.目前基准地价的评估方法有很多种,通过建立样点地价与土地定级网格单元总分值关系模型,运用回归分析来测算水口镇商业用地基准地价.     

137Cs in marine samples from the Brazilian southeastern coastal region

The present work presents the results of ¹³⁷Cs concentration in seawater, fish and sediments samples collect in 11 sampling points, crossing the Brazilian Southeastern coastal region, from Vitória (ES) to Santos (SP), on a routine basis from 1997 to 2002. This monitoring program was carried out by the Instituto de Radioproteção e Dosimetria (IRD/CNEN/MCT), in cooperation with the Instituto de Estudos do Mar Almirante Paulo Moreira (IEAPM/Brazilian Navy), aiming at determining artificial radionuclides in marine samples. Additionally to the ¹³⁷Cs results, ⁹⁰Sr concentrations in fish samples from 1998 to 2002 are also reported.The ¹³⁷Cs in seawater follows a lognormal distribution, with a geometric mean of 1.8 Bq m^-3 and a geometric standard deviation of 1.4 (n=54), decay corrected to June/2002. For ¹³⁷Cs levels in fish samples a geometric mean of 0.19 Bq kg⁻¹ and a geometric standard deviation of 2.9 (n=39), decay corrected to June/2002, with a range of 0.03 to 1.7 Bq kg⁻¹, were obtained. Based on the ¹³⁷Cs mean concentration in fish as well as in seawater, a transfer factor of 1 × 10² was calculated, which is quite in agreement with the recommended value found in the Safety Report Serie 19.     

For What Applications Can Probability and Non-Probability Sampling Be Used?

Almost any type of sample has some utilitywhen estimating population quantities. The focus inthis paper is to indicate what type or combination oftypes of sampling can be used in various situationsranging from a sample designed to establishcause-effect or legal challenge to one involving asimple subjective judgment. Several of these methodshave little or no utility in the scientific area buteven in the best of circumstances, particularlycomplex ones, both probabilistic and non-probabilisticprocedures have to be used because of lack ofknowledge and cost. We illustrate this with a marbledmurrelet example.     

挥发酚水质样品保存条件的研究

应用正交试验法探讨挥发酚水质样品的最优保存条件，找出了对挥发酚水质样品保存影响最大的因素为保存温度，其次为样品的pH值。经实验证明，挥发酚样品浓度为0.2mg/L，温度5℃，保存时间在8h内，pH值为4的条件下，挥发酚水质样品的保存效果最好。     

主成分分析法用于厦门西港和香港维多利亚港沉积物样品分类研究

本文利用化学模式识别技术的主成分分析法对厦门西港及香港维多利亚港的１８个沉积物样品进行分类研究。所涉及的变量包括重金属Ｃｕ，Ｐｂ，Ｚｎ，Ｃｄ、有机污染物ＤＤＴ，ＰＡＨ，ＰＣＢ，ＨＣＨ，及碱性磷酸酶活性。正确的分类基于变量的适当选择，即选择代表来源不同的样品之典型特性的变量组合方式。     

生存空间相对性的再研究

生存空间可分为狭义和广义两种,狭义生存空间的特点是有限性和潜在性,扩展性或相对性则是广义生存空间的最大特征;对生存空间的分类研究,有助于某一国家或地区生存现状和发展潜力的评价;人们通过贸易,交换着各自的生存空间;发展经济和科学技术,合理分配生活和生产空间,保护环境,控制人口,以及对资源的合理分配,是人类保护和扩大生存空间努力的基本方面。     

萧红创作的生命底色

萧红被誉为20世纪30年代的文学洛神。她30韶华年纪便撒手人寰，令时人和后人深深叹惋.然而，对于人生的痛切体验和感悟，对于普通人的生存状态和生命意义的关注和探究，却充满灵性地从这位年轻作家的笔端如山泉般潺潺流出，汇聚成关于生命这个历久弥新话题的涌动的歌。而对人性弱点的剖露，对国民性弱点的批判，对美好人性的歌咏又使作家对人生这部大书的解读富有深度和韵味。     

Quantification of the Erosion Resistance of Undisturbed and Remoulded Cohesive Sediments

Cohesive sediments besides their typical heterogeneity are characterised by structural discontinuity. Particularly, organic consolidated muds are a good example of sediments that consist of vast aggregates, pore water and gaseous products. The texture of a cohesive sediment bed is a result of a number of mutually affecting factors, such as deposition history, mineral and organic composition, kind of biota and oxygen uptake. The presented work attempts to quantify the effect of sediment physical properties and sediments structure on the sediment erosion potential, considering incipient motion and erosion rate. This quantification is made on the basis of comparative testing of both unremoulded and remoulded samples of a river mud. Due attention is paid to sediment handling to preserve the delicate structure of the sediment for the laboratory experiments. Mud with two degrees of consolidation has been examined in a tilting flume under different flow situations. The test results show a typical increase of erosion strength with dry matter concentration of the mud. It has also been found that the structural properties increase the erosion strength for the less consolidated mud. An opposite effect has been recorded for a more consolidated deposit. As a consequence, due to the sediment structure, the original beds differ much less in erosion resistance in relation to the dry mass concentration than their disturbed analogues. Finally, the erosion resistance of the examined mud is compared with data from the literature.     

基于概率神经网络的液氨汽车罐车复合故障诊断

故障诊断在保证危险化学品汽车罐车运输安全方面具有重要意义。从国内交通运输安全的实际要求出发,依据液氨汽车罐车的结构特点及国家法律法规的要求,比较全面、系统地分析了液氨汽车罐车故障特征的相关参数,并将其作为概率神经网络的输入结点。根据实际可能发生的故障分类模式,考虑到故障诊断的容错能力和自适应能力,提出了基于概率神经网络的复合故障诊断模型。利用指标参数作为网络训练样本,对未知故障模式进行诊断,并以广西地区压力容器检验所液氨检测数据为例进行说明。理论分析和实例计算表明,该模型物理概念清晰,计算结果合理,精度较高,在危险化学品汽车罐车故障诊断中有很好的适用性。该项工作可为我国危险化学品汽车罐车故障智能诊断的深入开展提供参考依据。     

Urban reconciliation ecology: the potential of living roofs and walls

Reconciling human and non-human use of urban regions to support biological conservation represents a major challenge for the 21st century. The concept of reconciliation ecology, by which the anthropogenic environment may be modified to encourage non-human use and biodiversity preservation without compromising societal utilization, potentially represents an appropriate paradigm for urban conservation given the generally poor opportunities that exist for reserve establishment and ecological restoration in urban areas. Two habitat improvement techniques with great potential for reconciliation ecology in urban areas are the installation of living roofs and walls, which have been shown to support a range of taxa at local scales. This paper evaluates the reconciliation potential of living roofs and walls, in particular highlighting both ecological and societal limitations that need to be overcome for application at the landscape scale. We further consider that successful utilization of living roofs and walls for urban reconciliation ecology will rely heavily on the participation of urban citizens, and that a 'citizen science' model is needed to facilitate public participation and support and to create an evidence base to determine their effectiveness. Living roofs and walls are just one aspect of urban reconciliation ecology, but are particularly important 'bottom-up' techniques for improving urban biodiversity that can be performed directly by the citizenry.