Results 31 to 40 of about 19,312 (167)
Jingshui jishu【目的】本文针对活性污泥2d号模型(ASM2d)参数众多、不确定性高的问题，开展参数敏感性分析，以识别关键参数、降低模型校准复杂度，为工艺模拟、校准与优化提供依据。【方法】本文以某污水厂厌氧-缺氧-好氧(AAO)工艺为对象，构建生物段处理工艺ASM2d模型，采用蒙特卡洛模拟结合拉丁超立方抽样，对筛选的39个模型参数进行全局敏感性分析，研究了不同模拟次数(78～210组)对分析结果的影响，并通过标准化回归系数量化参数对各出水指标的影响程度。【结果】当模拟次数达到156组以上时 ...
Zhu Jialu, Ma Yan
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Study on reductive amination of biobased levulinic acid [PDF]
, 2016 乙酰丙酸是重要的生物基平台化合物，其转化利用受到科研工作者的广泛关注。乙酰丙酸的还原胺化是制备高附加值乙酰丙酸胺化衍生产品的重要途径，近年来成为研究的热点。本论文建立了无催化剂乙酰丙酸还原胺化的反应体系，探讨了乙酰丙酸还原胺化合成直链氨基酸4-二甲氨基戊酸（4-DAPA）和环状化合物5-甲基-2-吡咯烷酮（5-MeP）的反应途径。 首先，研究了以N，N-二甲基甲酰胺为胺源，在无催化剂条件下直接还原胺化乙酰丙酸合成新型化合物4-二甲氨基戊酸（4-DAPA）的反应途径。在200℃条件下反应4h，4 ...
王彦钧
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Conservation Biology, EarlyView.Abstract Achieving global conservation policy goals requires the ability to set and measure progress toward science‐based targets for biodiversity. The species threat abatement and restoration (STAR) metric was developed to enable actors to set science‐based targets for species.
Louise Mair +17 more
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Zhongshan Daxue xuebao. Yixue kexue ban, 2019 【目的】探索青光眼患者角膜生物力学与视盘生物力学间的关系。【方法】前瞻性病例观察研究。观察32例原发性开角型青光眼（POAG）患者、20例正常眼压性青光眼（NTG）患者、15例高眼压症（OHT）者和26例正常者的角膜生物力学参数及筛板厚度特征，评估测量筛板厚度（LCT）的可重复性，采用单因素方差分析比较不同类型青光眼者间筛板厚度差异，并应用Spearman相关分析方法分析角膜生物力学参数与筛板厚度相关性。【结果】扫频OCT所测量筛板厚度的Cronbach′sα系数0.911，组内相关系数ICC也大于0 ...
杜绍林
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Intensity Distribution Design for Laser-Induced Thermal Loading Based on Numerical Simulation [PDF]
, 2006 To accomplish laser-induced thermal loading simulation tests for pistons,the Gaussian beam was modulated into multi-circular beam with specific intensity distribution.A reverse method was proposed to design the intensity distribution for the laser ...
Li SX(李少霞) +2 more
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Drivers of bat researchers’ intent to adopt field hygiene practices
Conservation Biology, EarlyView.Abstract Infectious disease is a growing threat to wildlife, with zoonotic transmission most likely at the human–wildlife interface. One underappreciated activity at this interface is fieldwork with wild animals, but associated risks can be mitigated through field hygiene (FH) practices, such as using personal protective equipment and other appropriate
Joanna L. Coleman +6 more
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Zhongguo shiyan zhenduanxue, 2015 目的应用三维能量多普勒超声对盆腔肿物内血流参数进行定量分析,探讨三维能量多普勒鉴别盆腔肿物良恶性的价值。方法测量24例盆腔包块,其中包括血流指数(flow index,FI)、血管形成指数(vascularization index,VI)、血管形成-血流指数(vascularization-flow index,VFI)。对比分析两组血管参数值。结果 1三维能量多普勒血管成像可较清晰显示肿物内血流架构;2恶性肿物组的VI、FI和VFI值均明显高于良性肿物组 ...
蒋雪, 冯蕾, 王琼, 杜领娣
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MH(81) equation of state and calculation of liquid viscosity(MH(81)状态方程与液体粘度的计算)
Zhejiang Daxue xuebao. Lixue ban, 2002 在Eyring的液体粘性流动分子模型基础上, 导出一个双参数粘度新模型, 把属于传递性质的粘度与物质的体积、蒸发内能以及过量函数等平衡性质联系起来,为状态方程在粘度推算中的应用构筑了桥梁.用MH(81)状态方程计算了40个液体纯物质和19个二元液体混合物的粘度,总体平均偏差分别为1.82%和1.78%.
LEIQun-fang(雷群芳) +2 more
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The single pulse thermal effect mechanism of micro-EDM [PDF]
, 2016 为了解微能量单脉冲放电加工原理,文中从微细电火花单脉冲放电加工具有放电时间短,放电通道半径小,能量密度高等特点入手,从单脉冲热作用模型的放电通道半径和能量分配系数方面对当前电火花单脉冲蚀出模型进行改进。建立了时变放电通道的热作用模型,并验证了模型的正确性,提出了单脉冲热作用模型中能量分配到工件表面的百分比系数随着放电参数的变化而变化的规律,为微细电火花的广泛应用奠定基础。The single pulse micro electric discharge machining( micro-EDM) has
张利琼 +5 more
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Research progress on the control of reactive elements in remelted ingots during the electroslag remelting process [PDF]
Electroslag remelting (ESR) is an important secondary refining technique that effectively removes impurities and nonmetallic inclusions, improves the solidification structure of ingots, and enhances the mechanical properties of steels.
Lifeng ZHANG, Shengchao DUAN
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