共查询到20条相似文献，搜索用时 15 毫秒
1.
In this paper, the model of the maximum utility of profit margin of commercial banks under the credit risk and the interest risk is reformulated with full consideration of the profile of the losses of bad debts for the commercial banks. The influence of the requirement in the capital adequacy by the central bank to the commercial banks on bank's yields is studied.Analysis shows that considering the risk loss and risk cost of the commercial bank,enhancing the capital adequacy to commercial bank will increase margin profit of commercial bank with decreasing absolute risk avoidance under the Ross concep. 相似文献
2.
近年来,食品安全事件频繁发生,农产品质量问题备受关注,农产品是与人类健康联系最紧密的消费品,改善农产品质量势在必行。本研究以农业龙头企业农产品的质量控制为研究对象,从农产品的料供应质量控制、企业主体质量控制、政府及消费者的质量控制三个角度入手,构建相应的评价指标。评价指标的选取充分考虑了农业龙头企业的特点与农产品质量控制的特殊性,应用层次分析法,选出了5个一级评价指标：农民（基地）农产品质量控制、企业内部农产品质量控制、市场竞争优势、政府的质量监控、消费者的质量监控,以及细化的二级指标。农业龙头企业可以选择模糊评价法对几年的指标进行综合评价,分析企业农产品质量控制的优点与不足,不断提高农产品质量与管理。 相似文献
3.
研究旨在提高农户贷款信用风险度量的准确性,降低银行涉农贷款的不良率,促进银行对农户的信贷覆盖。从农户户主特征、资产负债、家庭收支和还款意愿4个方面选取违约判别指标,运用因子分析法克服多重共线性,基于Logistic原理构建适用于农村中小银行的农户贷款违约风险评估模型,并以中国家庭动态跟踪调查CFPS2018数据为样本进行实证研究。研究发现,农户的资产状况是影响贷款违约最主要的因素,资产负债率与其贷款信用风险正相关;家庭消费性支出越多,贷款违约的可能性越大;信任认同是重要因素,农户与人合作的信任度越高,违约风险越小。构建模型的预测准确率超过90%,具有普遍适用性。鼓励有条件的农村中小银行实施信用风险内部评级,提高农户的信贷覆盖,同时要加强相关配套建设,如优化风险组织架构、完善风险管理制度、优化风控人才队伍。 相似文献
4.
研究旨在探索黄瓜集约化穴盘商品成苗质量快速检测方法,为商品苗成苗形成定性标准及苗期病害的及早隔离防治提供参考。试验抽样采集70份北京、河北和山东地区集约化育苗场生产的黄瓜穴盘商品苗样品,对株高、茎粗、干/鲜质量和壮苗指数等生理指标进行系统检测,同时对严重影响黄瓜种苗生产交易的霜霉病带菌情况进行PCR检测。结果表明,北京地区采集的55株样品平均壮苗指数0.078,霜霉病检出率34.55%;河北地区采集的10份样品平均壮苗指数0.079,霜霉病检出率80.00%;山东地区采集的5份样品平均壮苗指数0.101,霜霉病检出率20.00%。另外,研究发现黄瓜商品苗根干重与壮苗指数相关性高达0.995且呈显著正相关,可以作为快速评价黄瓜穴盘商品苗形态生理质量的可靠依据;同时,PCR技术可以作为早期评价黄瓜穴盘商品苗健康质量的重要手段。本研究可为快速精准评价黄瓜种苗质量和进行质量控制提供科学依据,亦可为其他蔬菜种苗质量评价提供科学参考。 相似文献
5.
Fruit colour, both external and internal, is important because it relates directly to the commercial value of the product.
In breeding and in pre- and postharvest studies of fruit colour, an effective method for evaluating colour is needed to replace
subjective evaluations by eye. We used a series of data processing and statistical analyses used in content-based image retrieval
to evaluate melon flesh colour, and assessed the efficacy of this approach. This method relies on summarizing colour information
from images into colour signatures, calculating the earth mover’s distance (EMD) between colour signatures, and multi-dimensional
scaling (MDS) based on an EMD matrix. Performing MDS on a set of fruit flesh images revealed important colour features, such
as the yellowish-green strength in green-fleshed melons and the relative size of the green and red parts in red-fleshed melons,
without the need for an explicit definition of these features. The proportion of variance due to differences among cultivars
was higher by MDS than by traditional evaluation, indicating that this new method performed best at detecting colour differences
among cultivars. The method provides effective, objective indicators of fruit colour, and shows considerable promise for use
in research and breeding programs. 相似文献
6.
The index system of potential evaluation of land intensive use in metropolis is put forward.RS is the primary data source in this system.Based on this system,a quantitative evaluation model of land intensive use is founded,which regards the artificial neural network(ANN) method as the subject appraisal method.This model is applied to evaluate the potential of land intensive use in Shijiazhuang.According to the result,the extensive use is predominant in residential area and commercial area,and the moderate use is most in industrial area.Therefore,the level of Land Intensive Use of residential area and commercial area is lower,and the level of Land Intensive Use of industrial area is higher. 相似文献
7.
福建省商品林投资风险评价 总被引：2，自引：2，他引：0
本文构建了福建省商品林投资风险评价指标体系。然后,采用因子分析法,对福建、浙江、广东、江西、湖南、湖北、云南等7个省份的商品林投资风险进行横向评价和比较,通过评价,发现2007年在7个比较省份中,福建省综合评价得分排名第二,风险较小。在此基础上,找出影响福建省商品林投资风险的薄弱因子,并提出相应的对策。 相似文献
8.
Respiration is responsible for much of the sucrose loss that occurs during sugarbeet (Beta vulgans L.) storage. Genotypes with reduced storage respiration rates would provide an efficient method for reducing sucrose losses. However, the current techniques for measuring storage respiration are not adapted easily to breeding programs. Internal CO2 concentration has been recommended as an efficient method for measuring the respiration rate of individual sugar-beet roots in storage. This study examined the effectiveness of internal CO2 concentration as a selection criterion for reducing respiration rate of sugarbeet during storage. Lines resulting from four cycles of divergent selection for internal CO2 concentration were evaluated along with commercial hybrids and low internal CO2 germplasm lines. Selection was effective in shifting internal CO2 concentration. Relative differences in internal CO2 concentration were consistent throughout the 3-year study. Neither the fourth-cycle selections for low nor the fourth-cycle selections for high internal CO2 concentration were significantly different from the original population for evolved CO2. This lack of a close relationship between internal and evolved CO2 indicated that internal CO2 concentration is not an effective selection criterion in a breeding program. 相似文献
9.
山东省农机合作社运营机制的综合评价——基于层次分析法 总被引：1，自引：0，他引：1
山东省农机合作社的发展过程中存在着运营机制不完善等问题,对合作社运营机制的各个组成部分进行综合评价,有利于了解运营机制各个部分对合作社运营机制整体的影响程度。为了评价农机合作社运营机制各个部分对整体的影响,通过采用层次分析的方法,将合作社的运营机制分为内部和外部两个方面,并具体划分了12个二级指标和33个三级指标,研究各个指标对目标层权重的影响,然后进行分析评价。结果表明,内部运营机制相对于外部运营机制而言对农机合作社运营机制的影响要重要的多,其中利益联结和分配机制最为重要,在外部运营机制中合作社与市场的联结机制这一指标最为重要。通过试验研究得出要优化农机合作社的运营机制,最重要的是对利益联结和分配机制、治理机制、和管理机制的优化。 相似文献
10.
G. N. Dhanapal P. C. Struik M. Udayakumar P. C. J. M. Timmermans 《Journal of Agronomy and Crop Science》1996,176(5):335-359
Broomrapes ( Orobanche spp.) are phanerogamic holoparasites that subsist upon the roots of many important crops thus causing considerable yield losses, especially in the drier and warmer areas of Europe, Africa and Asia.
The major principles of reducing the seed bank and controlling the weed in the germination and parasitic/ reproductive phases are critically reviewed. Practices to control broomrape include physical methods (weeding, soil tillage, flooding, irrigation, solarization, flaming), chemical methods (soil fumigation, herbicide application, use of germination stimulants) and biological methods (use of resistant or tolerant varieties, cropping systems with trap and catch crops, intercropping, biological control with insects or fungi). Cultural practices which help to avoid germination, infection or strong reproduction of the weed or improve the crop's tolerance should be optimized.
However, no single cheap method can control the weed, so integrated management practices are required. Integrated control strategies are site- and cropping-system specific but have in common that measures are taken to kill part of the seed bank, induce the conditioned seeds to germinate in the absence of the commercial crop, kill emerging Orobanche shoots before seed set during growth of the commercial crop and further reduce or avoid damage to the commercial crop. 相似文献
The major principles of reducing the seed bank and controlling the weed in the germination and parasitic/ reproductive phases are critically reviewed. Practices to control broomrape include physical methods (weeding, soil tillage, flooding, irrigation, solarization, flaming), chemical methods (soil fumigation, herbicide application, use of germination stimulants) and biological methods (use of resistant or tolerant varieties, cropping systems with trap and catch crops, intercropping, biological control with insects or fungi). Cultural practices which help to avoid germination, infection or strong reproduction of the weed or improve the crop's tolerance should be optimized.
However, no single cheap method can control the weed, so integrated management practices are required. Integrated control strategies are site- and cropping-system specific but have in common that measures are taken to kill part of the seed bank, induce the conditioned seeds to germinate in the absence of the commercial crop, kill emerging Orobanche shoots before seed set during growth of the commercial crop and further reduce or avoid damage to the commercial crop. 相似文献
11.
大豆不同生长时期基因组DNA提取方法的优化 总被引：3，自引：1，他引：2
以优质大豆品种冀豆7号、冀豆16号、五星1号、五星2号和MK（Maverick）不同生长时期的叶片为材料,分别采用不同方法提取大豆基因组,并通过对提取的DNA的含量测定、琼脂糖凝胶电泳分析和内参基因的PCR扩增,对不同方法所提取的DNA质量进行综合评价。结果表明：在嫩叶期,改进的CTAB法能够 分离出纯度高、质量好的DNA,而在开花期,采用本试验的新改良CTAB法可以有效去除多糖、酚类等物质得到完整性和纯度较好的大豆基因组,为大豆的分子生物学研究奠定了基础。 相似文献
12.
银川市鸣翠湖湿地水质评价与污染物空间分布研究 总被引：1，自引：1，他引：0
为了避免单点位湖泊水质分析的片面性,提高湖泊水质分析的准确性,明确湖泊水质空间分布的特征,对银川市鸣翠湖利用国标水质分析检测方法,开展多点位水质综合评价,同时利用GIS空间分析手段中的反距离权重法,开展污染物空间分布研究。结果显示,湖泊内部不同区域综合水质评价结果存在一定的差异,单点位水质分析的结果不足以反映湖泊整体水质状况,污染物空间分布显示对水质影响较大的BOD5、CODcr、氨氮、总氮空间分布变化明显。空间分布的结果可以为湖泊水质的综合治理指明方向。因此,天然湖泊水质分析应进一步开展多点位综合评价和污染物空间分布研究。 相似文献
13.
Thermal performance of the green roof is an important basis for energy-efficient design and evaluation. However, the current studies on the thermal performance of the green roof seldom involve thermal inertia of the green roof. Based on a long-term experiment of an extensive green roof in natural ventilation state and a five-month ongoing measured data in summer, thermal inertia of the extensive green roof was studied by statistical analysis method. The results show that thermal decay to outdoor climate effect through green roof was increased by more than 100% and delay time of thermal response to outdoor climate on internal surface of the green roof was reduced in comparison with that of the bare roof. 相似文献
14.
为更好地服务新疆棉花生产,揭示32个棉花品种不同处理条件下各品种的特征特性,为优质棉花品种客观评价提供科学依据。采取不化学调控和化学调控2种处理,分别调查各品种的16个表型性状,应用DPS 7.05软件对数据进行分析和整理。结果表明,不同棉花品种性状存在明显变异,差异分析表明未化学调控和化学调空棉花品种的株高、单株果节数、倒三果枝长度、倒三果枝铃数、铃重、上半部平均长度6个性状的差异达极显著水平。主成分分析表明,未化学调控下前5个主成分涵盖了72.36%的信息,化学调控条件下前6个主成分涵盖了76.91%的信息。综合得出,化学调控条件下较好的品种（系）是‘新陆中66’、‘K836’、‘A03’、‘917’、‘邯棉646’、‘C9’,未化学调控条件下较好的品质依次是‘新陆中61’、‘中棉97’、‘邯棉646’、‘577’、‘新农兴2号’、‘K836’。主成分分析作为优良品种评价选择标准,避免了性状间相互作用造成的重复选择,较传统的评价选择方法更加科学准确,综合性强,因此新疆棉花品种的评价、选择、更新应以化学调控管理为准。 相似文献
15.
以中国渔政管理指挥系统作为评价对象,将该系统的信息化建设的长远目标和近期目标、内在组织流程和外部影响因素等诸多方面结合在一起,基于AHP层次分析法和模糊综合评价法构建中国渔政管理指挥系统管理信息化绩效评价模型和多层次、多维度的评价指标体系,实现对中国渔政管理指挥系统管理信息化绩效的客观评价。通过对管理信息化绩效评价的研究,将为渔业管理部门提供系统实用的信息化评价方法和工具,帮助渔业管理部门明确在信息化需求和实施绩效方面的优势和薄弱环节,便于管理决策层及时掌握当前的信息化实施状态。 相似文献
16.
A comprehensive evaluation method based on fuzzy matter element analysis is proposed to solve problems of multiple performance and quality evaluation for computer numerical control (CNC) equipment. The fuzzy matter element theory is utilized to analyze multi-scale quality characteristics and attributes. Then, the comprehensive quality evaluation model for CNC equipment is founded by using fuzzy matter element analysis method. Analytic hierarchy process (AHP) and information entropy are applied to obtain the objective index weights. Furthermore, the combinational weight is calculated with the optimal mathematics model based on the least square method. Finally, the fuzzy matter element method is used to determine the assessment result. The case study indicates that the method has a certain rationality and feasibility. 相似文献
17.
地下水人工回灌经济效益分析浅析 总被引：3，自引：0，他引：3
地下水人工回灌具有悠久的历史,人工回灌地下水的方法可分为两类：一是直接补给法,即把补给水源直接输送到地下水含水层中;二是诱导补给法,即除了达到自身的主要目的以外,还能对地下水起到诱发补给效果的方法。但每种方法都各有其特点和适应条件,要选择合适的地下水人工回灌方法,就必须对地下水人工回灌工程经济效益进行科学评价,这是保证回灌方案科学合理、回灌工程经济可行的必要前提。但目前地下水人工回灌效益研究往往是单方面的分析与评价,缺乏综合、系统的分析,提出的人工回灌经济效益包括7个方面：增加供水效益、扬程效益、减少新建水源工程效益、水质效益、增产效益、洪水控制效益和防治咸水入侵效益,并针对各种效益提出了相应的计算方法,完善了地下水人工回灌经济效益分析理论与计算方法,对于地下水人工回灌工程的可行性分析,实现地下水资源的可持续开发利用,改善生态环境,具有重要指导意义。 相似文献
18.
GUAN Chun~ 《保鲜与加工》2004,(12):37-41
To control the complex powers emanating from a bus in power system, there are two solutions. The obvious solution is to equip each of the n lines radiating from the node with its own UPFC. The next evolution of the idea is to equip with a multi-terminal UPFC. First, the configuration and the principle of the Two-terminal UPFC (when n=2) are presented. In consideration of the existing shortages of output model-constructing method and topological model-constructing method for T-UPFC, a switching function mathematical model of this device is constructed by introducing the concept of switching function. It has more generality than the output and the topological model with the consideration of the internal switching character and the physical course of the T-UPFC. 相似文献
19.
Plant oil emulsion modifies internal atmosphere, delays fruit ripening, and inhibits internal browning in Chinese pears 总被引：2，自引：0，他引：2
'Laiyang Chili’ and ‘Ya Li’ (Pyrus bertschneideri Reld) pears were treated with 3, 6, and 9% emulsions of commercial or refined (reduced -tocopherol levels) plant (soybean, corn, peanut, linseed, and cottonseed) oils at harvest an stored at 0°C for 6 months. Effects of oil treatments on ethylene production, respiration, fruit firmness, fruit color, soluble solid content (SSC), titratable acids (TA), internal browning (IB), and internal CO2, O2, and ethanol were studied. At the same concentration, oil treatments induced similar responses regardless of their sources or their -tocopherol concentrations. In both cultivars, ethylene production and respiration in fruit treated with 9% oils were lower in early storage and higher in late storage than that in the controls. Oils at 6% reduced IB, at 9% inhibited IB completely, and at 3% was not effective after 6 months at 0°C and 7 days at 20°C. Plant oil treatment maintained fruit color, firmness, SSC, and TA in a concentration-dependent manner during storage. In the first 4 months storage, 9% corn oil-treated fruit contained similar partial pressure of CO2 and O2 as the controls. After 5 months storage, oil-treated fruit contained higher partial pressure of CO2 and lower levels of O2 than the controls. When held at 20°C for 7 days, changes of internal CO2 and O2 were slower but partial pressure of CO2 were higher, and O2 were lower, in 9% corn oil-treated fruit than in the controls. Internal ethanol was not affected by oil treatment compared with control, either during storage or 7 days at 20°C. No off-flavor was detected in either oil-treated and control fruit by sensory evaluation. 相似文献
20.
糖料蔗新品种农艺性状及产量的比较 总被引：1，自引：0，他引：1
以糖料蔗绿色高产、高糖、高效为目标,以桂糖49号、桂糖42号、福农41号、桂糖43号、桂柳05136等5个优良新品种与新台糖22号（对照）为参试品种,采取小区试验与大田示范（表证试验）相结合的评价方法。小区试验结果表明,在广西来宾地区具有推广价值的糖料蔗优良新品种为桂柳05136、福农41号和桂糖49号,其理论产蔗量分别比对照新台糖22号增产9.07、7.40和5.99t/hm 2,分别提高10.31%、8.41%和6.81%;理论产糖量分别比对照新台糖22号增产1.34、1.28和0.88t/hm 2,分别提高11.02%、10.53%和7.24%。大田示范（表证试验）结果表明,桂柳05136、福农41号和桂糖49号的理论产蔗量和理论产糖量均显著高于对照新台糖22号,桂柳05136、福农41号的蔗糖分显著高于对照新台糖22号,这与小区试验结果相吻合。 相似文献