生长曲线在地震活动性分析中的应用     

王季达  高国英  王公达 《高原地震》1994,(3)

文中把“生长曲线”引入地震活动性分析中,介绍了两种类型的生长曲线,应用甘培茨曲线模拟了新疆自１８８２年开始至今的地震活动。结果表明,曲线能够从数学角度较好地描述地震活动期的发生过程,并在地震活动性分析中有较广泛的应用前景。  相似文献   

对虾育苗增效剂络合重金属离子的研究     

韩丽君  曹文达 《海洋科学》1990,14(5):49-52

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关于鱼的生长方程的研究──Ⅰ.鱼的生长方程的修正     

赵维谦 《海洋与湖沼》1994,(4)

指出vonBertalanffy生长公式的局限性在于公式导出时所用假设“鱼的体重增加量同体重的2／3次方成比例，减少量同体重成比例”的根据不充分；其不足之处在于解方程时将变量l误为鱼的体长。本文作了更为一般的假设，即鱼的体重增加量同体重的P次方成比例；减少量同体重的q次方成比例。进而通过严格的数学推导，得出鱼的更为一般的生长方程w=w∞[1-e－k(s-s0)]r，使vonBertalanffy生长公式是该方程的特殊情形．  相似文献   

大黄鱼耳石、体长与年龄的关系   总被引：8，自引：0，他引：8  

兰永伦  罗秉征 《海洋与湖沼》1996,27(3):323-329

运用１９６０年３月－１９６０年４月由中国科学院海洋研究所采集于洞头，吕泗渔场大黄鱼标本５１３尾，利用耳石切片确定大黄鱼的年龄，通过分析大黄鱼的耳石和体长的生长规律，证明大黄鱼的耳石生长不仅仅与鱼体生长成简单的直线相关，而且大黄鱼的耳石生长，体长生长和年龄三者之间密切相关，并推导出数学方程式，拟合计算结果表明，两各方程式能够较准确地表达三者之间的相关关系。  相似文献   

胶州湾水域短吻舌鳎年龄、生长及其年龄结构特征的研究     

朱鑫华  马道元 《海洋科学》1992,16(1):49-53

依2450尾短吻舌鳎渔业生物学测定和耳石观测,数理分析得出,耳石轮径与鱼体全长呈线性相关,与纯体重呈显著幂函数关系。运用过程分析法确认年轮形成以年为周期,主要为4～5月。经二次线性拟合年间 Von Bcrtalanffy 生长方程:雌鱼L_t=350.8996[1—e~(-O.3965(t+0.7574)], W_t=269.1963[1—e~(-0.392(t+0.7165)]3.1175;雄鱼L_t=314.0091[1—e~(-0.3444(t+1.1236))],W_t=191.6984[1—e~(-0.3263(t+0.9666)]~2.8788胶州湾水域短吻舌鳎年龄构成0～Ⅷ龄,Ⅱ龄鱼占优势(34.06％)。  相似文献   

Growth coalitions in declining cities: casinos,redevelopment, and inter-urban competition     

Alissa Mazar 《Urban geography》2018,39(6):822-843

Casino development is a popular strategy for urban redevelopment in declining cities. I examine the process of casino acquisition in the former Canadian automotive capital, Windsor, Ontario – one of the first cities in North America, outside of Atlantic City and Las Vegas, to host a resort casino. Drawing on 20 interviews with urban elites and the local news media, I explore the interplay between a local growth coalition and State interests in the development of Casino Windsor. To capture maximum revenue for provincial coffers, provincial interests used competition between economically depressed cities to co-opt the Windsor casino alliance’s project . Windsor’s urban elites, however, continue to “talk” urban entrepreneurialism, perpetuating the myth that municipal entrepreneurialism was an effective strategy for this struggling city. These findings suggest that the importance placed on the entrepreneurial capacity of local growth coalitions in urban redevelopment studies may be misplaced, especially in peripheral and declining cities.  相似文献   

Synthetic seismic illumination of small-scale growth faults,paralic deposits and low-angle clinoforms: A case study of the Triassic successions on Edgeøya,NW Barents Shelf     

《Marine and Petroleum Geology》2016

Fault activity and sandstone-body geometries and spread, all bear significant weight to understanding the potential hydrocarbon systems on the NW Barents Shelf. Synthetic seismic modelling of onshore sedimentary successions provides insight into the seismic resolution and expression of various sedimentological features on Edgeøya: (i) sandy growth basins in pro-delta mudstones (ii) paralic sedimentary deposits and (iii) low-angle tidally influenced progradational successions.Synthetic modelling suggests that the lithological contrast associated with sand-infilled growth basins in pro-deltaic shales, even with offsets as small as 50–75 m, will create distinct geometries in seismic data. Modelling suggests that while optimal 90° illumination, low frequency bands and more typical sedimentary velocities around 2000 m/s will generate very clear discernible growth faults, the angular lithological contrast should generate discernible features even with the high velocities and typical 20–30 Hz frequency band of seismic sections on the NW Barents Shelf. Comparing to actual seismic data in which multiples, noise and in places overburden are influential, it is possible to identify growth-fault geometries more confidently, and to link them to larger planar fault activity.Modelling other features identified in the paralic sedimentary system it is apparent that many of the massive channel or lenticular shaped sandstone bodies should be identifiable in the actual seismic, although their expression is less distinct and more easily misinterpreted than that of growth faults. It is apparent that features such as igneous intrusions, unless imaged in a “perfect” survey, can be difficult to properly identify, particularly near-vertical connections. The velocity contrast creates strong impedance along horizontal sections, but heavily fractured igneous intrusions with lower velocities could easily be assumed to be isolated sandstone bodies. While the modelling appreciates the overall wedging nature of the successions, the simplified lithological observations onshore cannot predict the probable erosion/condensation contrast associated with low-angle clinoforms which are visible in the seismic data, and hence not reproduce them easily in the models.  相似文献   

暗纹东方鲀生长性状相关微卫星标记筛选     

马爱军  邹杰  孙建华  王婷  王广宁  崔文晓  王新安  刘大勇  郭正龙 《海洋科学》2016,40(10):16-24

为了筛选与暗纹东方鲀(Takifugu obscurus)生长相关的分子标记,作者采用SSR结合BSA技术对同龄孵化群体的同池养殖暗纹东方鲀生长差异性状标记进行筛选。利用85对微卫星引物对暗纹东方鲀生长快、慢各30尾个体构建的两个基因池进行分析,共筛选到14个差异位点。然后分析这14个差异微卫星位点在这60个暗纹东方鲀个体中的基因型差异,结果表明:位点TOP03、TOG01、fms15、fms75与生长性状呈现极显著负相关关系(P0.01),fms89与生长性状呈现极显著正相关关系(P0.01)。用另外30个个体(生长快慢各15个)进行验证实验后,结果只有位点fms15、fms75与生长性状显著相关,相关系数分别为–0.411和–0.384。这两个微卫星位点对于暗纹东方鲀生长性状有显著效应,为开展暗纹东方鲀的分子标记辅助育种提供了有价值的参考标记。  相似文献   

基于龚帕斯生长曲线的高填石路堤沉降规律分析   总被引：15，自引：0，他引：15  

赵明华  吴建宁  陈昌富  刘江波 《中国岩溶》2005,24(2):115-118

高填石路堤的沉降变形过程一般为从填石体施工期的瞬时变形到进一步的蠕变变形,其沉降变化规律与龚帕斯生长曲线变化规律相似,有着较为明显的出生、成长、成熟和衰老的阶段。通过对龚帕斯生长曲线模型的合理取值,可较好的利用该沉降分析模型来拟合和分析高填石路堤的沉降数据,并且可以反映出沉降的发展变化趋势,作出沉降预测。   相似文献   

Growth,abundance, morphometric and metabolic parameters of three populations of Diplodon chilensis subject to different levels of natural and anthropogenic organic matter input in a glaciar lake of North Patagonia     

《Limnologica》2014

Three populations of Diplodon chilensis (Hiridae, Bivalvia) from North Patagonia (Lacar lake, Argentina) have been studied to determine how organic matter (OM) influence their growth, density, morphometric and metabolic parameters in two pristine sites (Yuco and Nonthué) and in a growing touristic locality (San Martín de los Andes Bay, site SMA) affected by urban discharges. In Nonthué (chemical and biological oxygen demand ratio COD/BOD ratio of 4.7), a dense neighboring forest provides higher quantities of vegetal detritus compared to Yuco, while in SMA the OM input increase is related to anthropogenic impact, mainly sewage discharges, which is more biodegradable (COD/BOD ratio of 1.7). Our results show that population's size distribution and growth rates are affected positively by increased OM, independently of its natural or anthropogenic origin. The modal shell length interval for SMA and Nonthué is two-fold higher (70 mm), in agreement to the growth rate increase (k = 0.079), compared to Yuco (35 mm, k = 0.045). The morphometric relationships between size–size and size–mass show a higher slope for SMA and Nonthué, which underline allometric differences between these two populations and the Yuco's one. The lower population densities in both sites (SMA 33 ind./m² and Nonthué 76 ind./m²) compare to Yuco (176 ind./m²) and the absence of individuals younger than 7 and 5 years old, respectively, in SMA and Nonthué could be related to the higher allochthonous OM content in the sediments and total suspended solids in water. Increased OM due to urban pollution in SMA bivalves leads to higher oxidative damage to lipids, which is not counterbalanced by the higher detoxification enzyme glutathione-S-transferase activity. Hence, we can conclude that pollution would explain the drastic reduction in population density, probably related to a high impair in the juvenile's survival/recruitment, the higher observed mortality and the lower population longevity. When increased OM is supply by the forest, like in Nonthué, this has less negative effect on population density and no effect on longevity at all. However, a negative effect of oxygen depletion due to increased OM (either anthropogenic or natural) on juvenile survival cannot be discarded, but further studies should be carried out to support this idea.  相似文献