檢索結果 - Ding LI

This letter proposes a behavioral model to estimate the statistical photon arrival time for time-of-flight (TOF) measurement circuit simulation. A theoretical model is derived to calculate the photon arrival rate by full consideration of a variety of properties of a TOF measurement system, such as l...

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Relative radiometric normalization (RRN) minimized radiometric differences among images caused by inconsistencies of acquisition conditions (such as weather, season, sensor, etc.) rather than change in surface reflectance. Five methods of RRN, i. e. image regression (IR), pseudo-invariant features (...

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Citrus canker, an epidemic quarantine disease caused by Xanthomonas axonopodis pv. citri, has brought a great damage in citrus production worldwide. Herein, a rice PRR (pattern recognition receptor) gene Xa21 together with GUS reporter gene and hygromycin phosphotransferase gene (HPT) was introduced...

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Landscape fragmentation often lead to edge effects on ecosystems. Edge effects of shrub-layer plants on islands in typical fragmental area of Thousand-island Lake were analyzed. On 10 less-disturbed and more isolated islands, shrub-layer plant species was selected as study object and composition and...

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人类的生存与发展和生态环境条件相互依存、相互制约，但粗放型经济增长方式与掠夺式资源开发将导致生态环境的人为破坏．因此合理利用自然资源，保护和建设好生态环境，实现生态环境的可持续发展，是我国建设发展过程中必须始终坚持的一项基本国策．本文从区域生态环境人手，建立了综合评价指标体系模型，并采用层次分析与模糊聚类分析相结合的方法，对浙江省生态环境的可持续发展能力进行了综合评价，以期为区域生态环境可持续发展能力的评价提供一种简单可行的方法．...

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Background Gastric cancer (GC) is a global leading source of cancer-associated deaths. Circular RNAs (circRNAs) are a new type of non-coding RNA and promising biomarkers for diagnosis of multiple diseases such as cancer.Methods Circ-PRMT5 expression was validated in 90 GC patient tissues and 6 diffe...

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Soil bulk density is a basic but important physic soil property related to soil porosity, soil moisture and hydraulic conductivity, which is crucial to soil quality assessment and land use management. In this study, we evaluated the spatial variability of soil bulk density in the 0–20, 20–40, 40–60...

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Polyimide (PI) is a type of important membrane material. A soluble polymer was synthesized from 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and 2,2-bis[4-(4-aminophenoxy) phenyl] hexafluoropropane (BDAF) by the two-step polymerization method. The polymer was proved to be polyimide 6F...

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Objective Cyclin D1 was an important molecular involved in the pathological process of osteoarthritis (OA). The purpose of this study was to identify the effect and potential mechanism of Cyclin D1 for the proliferation and apoptosis of OA chondrocytes.Methods We used polymerase chain reaction (PCR)...

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Heat stress negatively affects wheat production in many regions of the world. At present, sensitivity to heat stress remains one of the least understood aspects of wheat genetics and breeding, and measures for preventing heat stress are understudied. In this study, we used three cultivars of winter...

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Stalk related traits, comprising plant height (PH), ear height (EH), internode number (IN), average internode length (AIL), stalk diameter (SD), and ear height coefficient (EHC), are significantly correlated with yield, density tolerance, and lodging resistance in maize. To investigate the genetic b...

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ABSTRACT Exploring community assembly is essential for understanding the mechanisms of biodiversity maintenance and species coexistence. In general, stochastic (e.g., dispersal limitation) and deterministic (e.g., environmental filtering) effects have been identified as the two key processes driving...

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Heat stress seriously affects wheat production in many regions of the world. At present, heat tolerance research remains one of the least understood fields in wheat genetics and breeding and there is a lack of effective methods to quantify heat stress and heat tolerance in different wheat cultivars....

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市场上存在利用低价食用植物油掺伪或冒充高价食用植物油的现象，机器学习算法可应用于食用植物油的掺伪鉴别中。旨在为食用植物油掺伪鉴别研究中算法选择提供一定的理论依据，简要介绍了机器学习算法的分类及其在食用植物油掺伪鉴别中应用的流程，并对国内外机器学习算法在橄榄油、山茶油及其他植物油掺伪鉴别中的应用进行分析总结，同时探讨了支持向量机、随机森林、逻辑回归、人工神经网络、主成分分析等机器学习算法在食用植物油掺伪鉴别研究中的优缺点。需要综合考虑数据的特点、模型的性能和实际应用的需求选择合适的机器学习算法，以提高食用植物油掺伪鉴别的准确性和鲁棒性，为食用植物油市场的健康发展提供有力的技术支持。 There...

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