GIS数据质量的模糊综合评判分析

GIS数据在生产过程中由于各方面的原因,常使数据质量的优劣具有模糊性,给数据质量评价带来困难,影响了GIS应用。本研究尝试将模糊数学概念引入GIS数据质量评价中,用模糊数学理论建立GIS数字化产品质量评估模型。介绍了模型中评判因子、评价集、权重确定和模糊集合隶属函数的建立过程,并举例说明应用模糊综合评判方法对矢量化产品的评判过程。该方法有效地解决了GIS数据质量优劣的客观定性问题,使矢量化数据产品的评判简便、直观,保证了数据质量。     

环境工程地质质量多级模糊综合评判的基本思想与步骤

环境工程地质质量综合评价是一个复杂的系统工程。影响质量评价的因素众多而又十分复杂,且各因素的影响程度也不相同,质量优劣的分级界线亦是模糊的。本文仅就采用多级模糊综合评判的方法,考虑多个因素的综合作用,对环境工程地质质量进行评价的基本思想途径与步骤方法,作一初步论述。此方法清晰、易用,能使更多影响质量评价的因素真实参与评判。这是一条环境工程地质质量评价由定性走向定量的有效途径,值得探索。     

鲢鱼降血压肽的酶解条件

以鲢鱼蛋白为原料,采用5种不同复合蛋白酶(P1,P2,P3,P4,P5)进行酶解,综合研究了复合生物酶酶量、酶解时间、pH、酶解温度等对鲢鱼蛋白酶解降血压肽ACE活性抑制效果的影响。结果表明,复合酶P1酶解降血压肽对ACE抑制率经体外检测为88.08%,具有最佳的酶解效果。对应最佳条件为:酶量25 IU/mL,酶解时间2 h,pH7.0,酶解温度60℃。     

缩短珍珠加工周期,提高加工质量的试验

本文介绍了珍珠加工的基本原理,并提出作为评判珍珠加工质量的简单标准。利用优选法优选影响珍珠加工周期和加工质量的有关因子,同时合理安排多配方协同作用的结果,逐步总结出“ZP—Ⅱ珍珠漂白法”。“ZP—Ⅱ珍珠漂白法”比原工艺“ZP—珍珠漂白法”缩短了加工周期一半,并明显提高了珍珠加工质量。     

不同菠萝蜜株系果实品质分析

为选育出果实品质优良的菠萝蜜株系,对6个特色菠萝蜜株系(E2、E5、E6、E7、E9、E10)的果实品质指标进行分析,并依据主要指标进行模糊综合评判,评价各株系品质优劣。结果表明:株系E2、E5、E6、E7总体外观品质各有优势;株系E6有机酸、维生素C及可溶性固形物质量分数最高,显著高于其他株系(p值<0.01),糖分和可溶性蛋白质量分数也处于较高水平;其次为株系E5,除了维生素C和可溶性蛋白质量分数偏低外,其糖分、有机酸和可溶性固形物质量分数均较高;模糊综合评判结果表明,株系E6和E5属于果实品质较好的株系。     

洞室岩体质量模糊综合评价浅析

洞室岩体质量是一个多因素的模糊概念,评判其质量的边界用一个绝对判据来划分不够科学。因此,应用模糊数学方法,在单因素模糊综合评价的基础上,进行了六个因素的总体岩体质量模糊综合评价,并结合某隧道实例,对其七个洞段岩体质量进行了模糊综合评价,从评价结果来看,模糊数学方法是岩体质量评价中的一种有效方法。     

商丘市浅层地下水水质污染程度分区

浅层地下水水质污染程度分区质量,取决于背景值的确定和评价方法的选择。本文从商丘市浅层地下水水质污染程度分区的实践出发,详细介绍了环境背景值的确定方法,并用模糊数学评判划分浅层地下水水质污染程度分区的方法,这是一次有益的尝试。     

1∶50000正射影像数据检查库设计及实现

国家1∶50000基础地理信息数据库更新工程正射影像数据库是1∶50 000数据库更新工程建设的重要组成部分.为保证正射影像数据各项指标符合项目设计要求,保证入库数据的质量,并为今后进一步更新提供依据,设计正射影像数据检查库,并在1∶50 000 DOM更新工程中实施和应用,实现了正射影像数据入库检查的程序化处理和自动质量评判.     

延安市区斜坡稳定性两级模糊综合评判

本文采用两级模糊综合评判方法,在对延安市区斜坡稳定性进行定性分析和评价的基础上,选取主要影响因素作为评价指标并将其定量化,然后按不稳定、次不稳定、基本稳定和稳定等四个级别进行了延安市区斜坡稳定性两级模糊综合评判。评判结果较好地反映了市区斜坡带的实际稳定程度。该方法清晰易用,能使较多的影响因素参与评判,是进行斜坡稳定性定量化研究的一个有效途径。     

1:50000正射影像数据检查库设计及实现

国家1:50 000基础地理信息数据库更新工程正射影像数据库是1:50 000数据库更新工程建设的重要组成部分。为保证正射影像数据各项指标符合项目设计要求,保证入库数据的质量,并为今后进一步更新提供依据,设计正射影像数据检查库,并在1:50 000 DOM更新工程中实施和应用,实现了正射影像数据入库检查的程序化处理和自动质量评判。     

Multi-agent Blind Model and Its Application to Regional Eco-environmental Quality Assessment

1 Introduction Eco-environmental quality assessment is an activity that is affected by man-made factors. As other environmental systems, regional eco-environment is also a complicated and uncertain system (Wu et al., 2005). Owing to these reasons, people may produce a style of subjective un- certainty in mind in evaluating such system (Liu et al. 1999a; Wu et al., 2004). According to unascertained mathematics (Liu et al., 1997; Liu et al., 1999b), we know that this kind of subjective uncerta…     

杨桃果脯的护色保形工艺研究

研究了杨桃果片在不同护色液中、不同护色条件下的护色效果 ,及其在不同保脆保形液中的保脆保形效果。结果表明 ,1.7mol LNaCl水溶液腌制、护色 ,0 .0 90mol LCaCl2 + 0 .34mol LNaCl水溶液保脆保形效果较好。     

基于PSR框架模型的南四湖健康评价

根据“压力-状态-响应”(PSR)框架模型,对南四湖健康状态进行评价.选取南四湖流域人口密度、工农业供水需求、富营养化程度、南四湖生物多样性指数、环保投资指数等能够充分反映南四湖压力、状态和响应的指标构建评价指标体系;通过专家经验赋值法对各评价指标进行权重确定,并对指标进行标准化赋值;提出了南四湖健康评价模型并且得出南...     

基于指标规范值的海水水质评价的SVR模型

为了建立具有普适通用的海水水质评价的支持向量机模型,在设置各指标参照值和指标规范变换式,并对指标进行规范变换的基础上,应用免疫进化优化算法,建立基于指标规范值的海水水质评价的回归支持向量机模型。将优化好的模型用于珠江口海水水质的评价,其评价结果与BP神经网络的评价结果基本一致,从而表明基于指标规范值的支持向量机模型用于海水水质评价是可行的,且该模型较传统的支持向量机评价模型具有较好的普适性和通用性。     

Evaluation of the damage in fish spermatozoa cryopreservation

Cryodamages occur during sperm cryopreservation. Cryopreservation of fish sperm usually results in marked decrease in sperm quality, such as swelling or disruption of the plasma membrane, mitochondrial dysfunction, diminished sperm motility, impaired velocity, shorter motility period, denaturation, and release of some enzymes from spermatozoa. In this paper, damages in morphology, physiology, biochemistry and metabolism, and genetic integrity of fish semen after cryopreservation are discussed. New approaches in assessment of fish thawed sperm quality such as computer assisted sperm analysis, flow cytometic analysis combined with fluorescent probes and single cell gel electrophoresis are also briefly reviewed.     

采用非线性决策树的学生课堂教学满意度研究

学生反馈是评估高等院校课堂教学质量的重要指标。目前,对学生反馈的问卷仅进行主观理解和简单统计,无法提供准确定量的分析和支持依据。使用非线性决策树,对近3年本科必修双语课程《数字图像处理》的学生评教问卷进行数据挖掘,首先将其分成3类和10个不同输入,然后通过数据预处理、模型选择和建模,最后构建树状模型对其进行分析。分析结果符合对于该课程学生反应和争议较大的问题预期,为课程设计提供定量有效的教学分析工具。     

土地环境质量综合评价模型的建立——以山东半岛蓝色经济区为例

依据多目标区域地球化学调查资料,对土地环境质量综合评价方法进行探讨,建立评价模型。提出土地环境质量综合评价是土壤内部指标分等、外部指标定级,整合全部评价因素的新观点。采用相关系数、半方差函数进行指标筛选,层次分析法确定参评指标权重,通过隶属度函数模型将土壤不同含量单位的指标纳入同一评价体系形成内部因素,叠加区域地下水、农作物质量等外部因素,建立土地质量综合评价模型。根据模型对山东半岛蓝色经济区土地环境质量进行综合评价,结果表明:山东半岛土地可分为优质、优良、良好、中、差5等20级,其中可作绿色(111和121级)及无公害(211和221级)食品生产基地的土地占62.60%;需农业种植结构调整的512和522级土地面积267.54km2,多位于矿区(金矿、石墨矿、铜铁矿)周边或紧邻城镇地带。土地环境质量综合评价方法及模型的建立对山东其他地区基本农田保护和土地质量等级划分具有一定借鉴意义。     

Experimental Study on the Hydrodynamic Characteristics of a Submersible Fish Cage at Various Depths in Waves

Submersible fish cages can be submerged under the water to mitigate the negative effects that arise from severe sea conditions and improve the growing environment for the farmed fish. Thus they are increasingly applied in offshore aquaculture. To ensure both safety and economic efficiency of submersible fish cages, it is important to determine the optimum submergence depth. In this study, a series of physical model experiments were conducted to investigate the hydrodynamic performance of a submersible fish cage at various submergence depths(1/6, 1/4, 1/3, and 1/2 of the water depth as well as the floating condition for reference) with a model scale of 1:20. The results of the physical model experiment for the different depths were compared to analyze the effects of submergence depths on the mooring line tension and the movement of the floating collar. The results showed that the mooring line tension and the floating collar movement significantly attenuated with increasing submergence depth. However, the attenuation tendency became stable when the fish cage reached a certain depth. According to the results, 1/3 of water depth was determined as the optimal submergence depth of the fish cages. Deeper submergence depths showed no significant advantage from a perspective of the hydrodynamic characteristics of the fish cage. The determination of the optimum submergence depth is beneficial for the structural design and operation safety of submersible net cages.     

Comparative study of the nutritional composition and toxic elements of farmed and wild Chanodichthys mongolicus

Information of the difference in quality between farmed and wild fish is central to better ensuring fish products produced in aquaculture meet regulatory and consumer requirements.Proximate composition,amino acid and fatty acid profiles,and toxic elements contents of farmed and wild Chanodichthys mongolicus were established and compared.Significantly higher crude protein content while lower moisture content in farmed fish compared to wild fish were observed(P0.05).The percentages of total amino acids(TAA),total essential amino acids(TEAA),total non-essential amino acids(TNEAA)and total delicious amino acids(TDAA) in farmed fish were all significantly higher than those in the wild equivalent(PO.05).Compared to the FAO/WHO recommended reference values,the ratios of TEAA/TAA(39.84%-40.33%) were comparable to 40%and TEAA/TNEAA(66.22%-67.60%) were above 60%.Fatty acid profiles in both fanned and wild C.mongolicus were dominated by monounsaturated fatty acid(MUFA),with farmed fish contained much more MUFA content compared to wild counterpart(P0.05).Notably,wild fish exhibited significantly higher levels of total polyunsaturated fatty acid(PUFA) including eicosapentaenoic acid(EPA) and docosahexaenoic acid(DHA) than farmed fish(P0.05).The EPA(C_(20:5n3))and linoleic acid(C_(18:2n6)) were the predominant PUFA in wild and fanned C.mongolicus,respectively.Moreover,farmed fish displayed an overall lower toxic element levels(As,Cd,Pb and Hg) in comparison with wild fish,and both were far lower than the established limit standard.In conclusion,our results suggest that the nutritional quality of farmed C.mongolicus was inferior to their wild counterpart with respect to fatty acids nutrition,and therefore further studies should focus on the improving C.mongolicus diet in order to enhance the overall nutritional composition.