期刊文献+
共找到30篇文章
< 1 2 >
每页显示 20 50 100
苹果梨果胶理化特性的研究 被引量:18
1
作者 韩苗苗 李范洙 +1 位作者 朴一龙 张先 《食品科学》 EI CAS CSCD 北大核心 2010年第17期44-46,共3页
采用酸解法从苹果梨疏果和成熟果榨汁后的果渣中提取果胶,并对果胶纯度、色度、甲氧基含量、酯化度、黏度和相对分子质量进行测定。结果表明:用酸解法结合沉析法提纯的苹果梨果胶纯度在70%以上,疏果期果胶颜色为浅棕色,成熟期果胶颜色... 采用酸解法从苹果梨疏果和成熟果榨汁后的果渣中提取果胶,并对果胶纯度、色度、甲氧基含量、酯化度、黏度和相对分子质量进行测定。结果表明:用酸解法结合沉析法提纯的苹果梨果胶纯度在70%以上,疏果期果胶颜色为浅棕色,成熟期果胶颜色为白色。苹果梨成熟期果胶的特性黏度和相对分子质量分别为1.51×10-7Pa·s和6.96×105,均高于疏果期果胶,两者均为高酯果胶,其中疏果期果胶为慢凝型果胶,成熟期果胶为速凝型果胶。 展开更多
关键词 苹果梨 果胶 纯度 色度 甲氧基含量 酯化度 黏度 相对分子质量
下载PDF
Multiscale engineering of molecular electrocatalysts for the rapid hydrogen evolution reaction
2
作者 Huan Li Zhan Jiang +7 位作者 Yubo Yuan Yirong Tang Jie Zao Wentao Zhang Peiyi Han Xun Zhang Bulin Chen Yongye Liang 《Nano Research》 SCIE EI CSCD 2024年第7期6026-6031,共6页
Molecular electrocatalysts have demonstrated potential for the hydrogen evolution reaction(HER)due to their well-defined structures and high intrinsic activities.Achieving rapid production of hydrogen requires molecul... Molecular electrocatalysts have demonstrated potential for the hydrogen evolution reaction(HER)due to their well-defined structures and high intrinsic activities.Achieving rapid production of hydrogen requires molecular electrocatalysts to operate at high current densities,which still presents a challenge.In this work,we demonstrate that molecularly dispersed electrocatalysts of cobalt phthalocyanine anchored on carbon nanotubes(CoPc MDEs)are superior candidates due to the efficient charge transport between the substrate and the active site.The intrinsic activity can be enhanced by introducing functional groups on phthalocyanine.To facilitate mass transport,di(ethylene glycol)substituted CoPc molecules are further anchored on a threedimensional self-supported electrode(CoPc-DEG MDE@CC),enabling continuous operation for 25 h at−1000 mA/cm^(2)in 1.0 M KOH.Our study demonstrates the potential of molecular electrocatalysts for HER and emphasizes the importance of adjusting intrinsic activity,and charge and mass transport capacity for practical molecular electrocatalysts. 展开更多
关键词 hydrogen evolution reaction cobalt phthalocyanine intrinsic activity mass transport
原文传递
The Intrinsic Electron with Its Properties Such as Inner Structure and Self-Mass Is in Conflict with Quantum Field Theory
3
作者 Victor Vaguine 《Journal of High Energy Physics, Gravitation and Cosmology》 2023年第3期583-595,共13页
The quantum field theory (QFT) is one of branches of the Standard Model. According to QFT, quantum fields are the primary entities and particles are the excitations of these fields, coming in discrete lumps with no in... The quantum field theory (QFT) is one of branches of the Standard Model. According to QFT, quantum fields are the primary entities and particles are the excitations of these fields, coming in discrete lumps with no inner structures and with properties assigned by declaration. Such view is in conflict with the observed vacuum energy density, 140 orders of magnitudes less than required by the QFT. In addition, such view is challenged by Aphysical Quantum Mechanics (AQM), a deeper quantum theory. According to AQM, the fundamental understanding of quantum reality is expanded by the addition of two fundamental categories, aphysical and elementary consciousness of elementary particles. Based on AQM and as an example, the total ontology of the intrinsic (fundamental) electron is presented with its inner structure of perfect geometry consisting of the physical charged c-ring and aphysical cylinder, and with its properties such as self-mass, spin, magneto-electrostatic field configuration and magnetic moment. The position parameter in the inner structure demonstrates that there are no two identical intrinsic electrons in the Universe thus placing a question mark over the QFT principle of indistinguishability. 展开更多
关键词 Quantum Reality Physical-Aphysical intrinsic Electron Charged C-Ring Aphysical Cylinder Elementary Consciousness Position Parameter Constant U Ontology Self-mass Indistinguishable Inner Structure
下载PDF
Mass-to-Energy Conversion, the Astrophysical Mechanism 被引量:1
4
作者 Conrad Ranzan 《Journal of High Energy Physics, Gravitation and Cosmology》 2019年第2期520-551,共32页
A new interpretation of the relativistic equation relating total-, momentum-, and mass-energies is presented. With the aid of the familiar energy-relationship triangle, old and new interpretations are compared. And th... A new interpretation of the relativistic equation relating total-, momentum-, and mass-energies is presented. With the aid of the familiar energy-relationship triangle, old and new interpretations are compared. And the key difference is emphasized—apparent relativity versus intrinsic relativity. Mass-to-energy conversion is then brought about by adopting a three-part strategy: 1) Make the motion relative to the universal space medium. This allows the introduction of the concept of intrinsic energy (total, kinetic, and mass energies) as counterpart to the apparent version. 2) Recognize that a particle’s mass property diminishes with increase in speed. This means introducing the concept of intrinsic mass (which varies with intrinsic speed). 3) Impose a change in the particle’s gravitational environment. Instead of applying an electromagnetic accelerating force or energy in order to alter the particle’s total energy, there will simply be an environmental change. Thus, it is shown how to use relativity equations and relativistic motion—in a way that exploits the distinction between apparent and innate levels of reality—to explain the mass-to-energy-conversion mechanism. Moreover, the mechanism explains the 100-percent conversion of mass to energy;which, in turn, leads to an explanation of the mechanism driving astrophysical jets. 展开更多
关键词 RELATIVISTIC mass ENERGY Kinetic ENERGY MOMENTUM ENERGY Total ENERGY mass-Energy Conversion intrinsic mass Terminal Neutron Star ENERGY Emission Mechanism Astrophysical Jets DSSU Theory
下载PDF
Variational Principle in an Expanding Universe 被引量:1
5
作者 Giovanni Guido Gianluigi Filippelli 《Journal of High Energy Physics, Gravitation and Cosmology》 2018年第1期179-222,共44页
In this paper we complete the relativistic cosmological theory because we extend the variational principle including variations of metric induced by expansion of the space. We will show that the mass not only curves S... In this paper we complete the relativistic cosmological theory because we extend the variational principle including variations of metric induced by expansion of the space. We will show that the mass not only curves Space and Time but also generates them: we’ll speak of the principle of mass-space equivalence. Then the increasing mass generates variations of metric as also the space increasing or expansion. So, the dark component of the mass generates additional gravity around galaxies as well as additional space, which generates a pressure (dark energy) accelerating the galaxies in their move away. All this could explain the cosmic coincidence (Ωdm/Ωde ≈ 1). To talk about the increasing mass is equivalent to speak of mass creation in universe, causing the variation of the tensor (T) mass-energy tensor of all component fields. We conjecture that its variation is caused by mass-energy flow comes out from a physical system (Θ) composed by set of uncoupled quantum oscillators (structure of no-field) in vacuum state. All this allows formulating a variational principle which generates the cosmological equation with the (Λ) parameter and a tensor T* with variable mass density, where T*(T, Θ). 展开更多
关键词 mass-Space Lattice-Field No-Field intrinsic Quantum Oscillator DARK MATTER DARK Energy Vacuum
下载PDF
有质量弹簧的振动解 被引量:1
6
作者 戴宝印 代娜 《鞍山师范学院学报》 2003年第2期45-47,共3页
从有质量弹簧的波动方程出发 ,运用牛顿第二定律和胡克定律及微元分析法 ,给出定解问题 ;然后分离变量 ,直接求解波动方程 ,得到分离变数形式的解和频率ω所满足的本征值方程 ;再将tanω/ωm 展开成麦克劳林 (Maclaurin)级数形式 ,并采... 从有质量弹簧的波动方程出发 ,运用牛顿第二定律和胡克定律及微元分析法 ,给出定解问题 ;然后分离变量 ,直接求解波动方程 ,得到分离变数形式的解和频率ω所满足的本征值方程 ;再将tanω/ωm 展开成麦克劳林 (Maclaurin)级数形式 ,并采用迭代法解出弹簧振子的本征频率 ,导出弹簧的有效质量的渐近级数表达式 ;最后由初始条件解出其对应的振幅 。 展开更多
关键词 质量弹簧 波动方程 振动解 振幅 弹簧振子 本征值方程 本征频率
下载PDF
Neutrino Mass and Higgs Self-Coupling Predictions
7
作者 Ole L. Trinhammer 《Journal of Modern Physics》 2017年第6期926-943,共18页
Combining with cosmological constraints we find a most probable value of 17.6 meV for beta decay anti-neutrinos. In passing we note that our expectation for the quadric Higgs self-coupling deviates from standard model... Combining with cosmological constraints we find a most probable value of 17.6 meV for beta decay anti-neutrinos. In passing we note that our expectation for the quadric Higgs self-coupling deviates from standard model expectations by a factor equal to the ud quark mixing matrix element. This matrix element also turns up by its square root in the expected triple self-coupling. We present neutrino mass eigenstates related to the neutron beta decay. In our first scenario we get 15.2 meV for the lowest mass eigenstate, in the second we get 0.917 eV. The latter is to be covered by the KATRIN experiment, while the former comes close to the CRES sensitivity in the Project 8 reach. 展开更多
关键词 NEUTRINO mass HIGGS Self-Coupling intrinsic Quantum MECHANICS
下载PDF
工农通讯运动的内在逻辑、现实困境与路径选择——基于华中抗日根据地的考察 被引量:1
8
作者 周浒 《传媒观察》 2020年第11期96-102,共7页
在"全党办报,群众办报"成为中国共产党新闻工作的指导方针之前,各个根据地已经展开了丰富的工农通讯运动。工农群众参与到党报的报刊实践中,他们充当起党与基层群众联络的纽带,发挥了沟通与信息传递的职能。赋权后的工农通讯... 在"全党办报,群众办报"成为中国共产党新闻工作的指导方针之前,各个根据地已经展开了丰富的工农通讯运动。工农群众参与到党报的报刊实践中,他们充当起党与基层群众联络的纽带,发挥了沟通与信息传递的职能。赋权后的工农通讯员在运动中逐步实现了文化的翻身与自身的解放。本文在对华中抗日根据地的档案、报刊、回忆录等史料进行挖掘与梳理基础上,采取中观视角,对当时的工农通讯运动进行考察。重在探讨华中根据地的工农通讯运动的背景,其运动的内在逻辑是什么,面临着怎样的现实困境与挑战,这场运动选择了怎样的路径开展实践,最终实现了怎样的效果等问题。 展开更多
关键词 工农通讯运动 华中根据地 动员 内在逻辑 群众路线
原文传递
经典电动力学的适用界限 被引量:1
9
作者 张民仓 皇甫国庆 《陕西师大学报(自然科学版)》 CSCD 1995年第3期37-39,共3页
通过计算电子作为点粒子时的固有能以及电子在外电场中运动时的自作用力,给出了经典电动力学在尺度、波长及场强3个方面存在的界限,指出这些界限的存在源于经典电动力学的内部矛盾.对修改经典电动力学的有关理论进行了讨论.
关键词 固有能 电动力学 精典电动力学
下载PDF
The endoparasitoid Psyllaephagus arenarius benefits from ectoparasitic venom via multiparasitism with the ectoparasitoid Tamarixia lyciumi 被引量:1
10
作者 Peng-Xiang Wu Bao-Xu Ma +2 位作者 Feng-Ming Wu Jing Xu Run-Zhi Zhang 《Insect Science》 SCIE CAS CSCD 2020年第4期815-825,共11页
As solitary nymphal parasitoids of Pamtrioza sinica,the ectoparasitoid Tamarixia lyciumi and the endoparasitoid Psyllaephagus arenarius act as effective biocontrol agents.Thus,it is necessary to facilitate mass produc... As solitary nymphal parasitoids of Pamtrioza sinica,the ectoparasitoid Tamarixia lyciumi and the endoparasitoid Psyllaephagus arenarius act as effective biocontrol agents.Thus,it is necessary to facilitate mass productions of both species.Despite showing an excellent parasitic ability,Ps.arenarius is often trapped fatally inside 5th-instar nymphs of Pa.sinica due to strong host immunity.To improve the emergence rate of Ps.arenarius,we evaluated whether Ps.arenarius could utilize T.lyciumi venom via multiparasitism,so the parasitism characteristics of both species were examined between separate-existence(monoparasitism only)and co-existence(mono-and multiparasitism)systems.Further,the parasitism characteristics of Ps.arenarius on venom-injected hosts with/without T.lyciumi eggs were tested to further identify the facilitator.The results showed the parasitism rate of T.lyciumi was increased while that of Ps.arenarius did not change from separate-existence to co-existence systems.The intrinsic performances of two species in monoparasitism did not differ between separate-and co-existence systems.From monoparasitism(separate-existence)to multiparasitism(co-existence),no differences were detected in the intrinsic performances of T.lyciumi,but those of Ps.arenarius were greatly improved.After T.lyciumi venom injection,the parasitism characteristics of Ps.arenarius did not differ between venom-injected hosts with T.lyciumi eggs and those without,further indicating Ps.arenarius benefited from the venom of T.lyciumi females rather than T.lyciumi egg/larval secretions.Instead of negative effects,multiparasitism with ectoparasitoids improves endoparasitoids due to ectoparasitic venom.The study increases host resource utilization and provides creative ways for mass production of endoparasitoids. 展开更多
关键词 biocontrol agent host resource utilization intrinsic performance mass production parasitism characteristics
原文传递
聚乙烯醇分子中键合形式的研究
11
作者 宋建华 何永钙 罗淑玲 《广州大学学报(自然科学版)》 CAS 2006年第3期22-25,共4页
首先通过聚乙酸乙烯酯(PVAc)在氢氧化钠(NaOH)和甲醇(CH3OH)溶液中醇解获得聚乙烯醇,再通过粘度法测定聚乙烯醇和被高碘酸盐分解后物质的摩尔质量,从而计算出聚乙烯醇由“头尾相接”和“头碰头”两种键合方式的比率,发现在30℃时“头碰... 首先通过聚乙酸乙烯酯(PVAc)在氢氧化钠(NaOH)和甲醇(CH3OH)溶液中醇解获得聚乙烯醇,再通过粘度法测定聚乙烯醇和被高碘酸盐分解后物质的摩尔质量,从而计算出聚乙烯醇由“头尾相接”和“头碰头”两种键合方式的比率,发现在30℃时“头碰头”的几率大概为15%. 展开更多
关键词 聚乙烯醇(PVA) 粘度法 特性粘度 摩尔质量 键合几率
下载PDF
A Formulation of Spin Dynamics Using Schrodinger Equation
12
作者 Vu B.Ho 《Journal of Modern Physics》 2019年第11期1374-1393,共20页
In quantum mechanics, there is a profound distinction between orbital angular momentum and spin angular momentum in which the former can be associated with the motion of a physical object in space but the latter canno... In quantum mechanics, there is a profound distinction between orbital angular momentum and spin angular momentum in which the former can be associated with the motion of a physical object in space but the latter cannot. The difference leads to a radical deviation in the formulation of their corresponding dynamics in which an orbital angular momentum can be described by using a coordinate system but a spin angular momentum cannot. In this work, we show that it is possible to treat spin angular momentum in the same manner as orbital angular momentum by formulating spin dynamics using Schr&ouml;dinger equation in an intrinsic coordinate system. As an illustration, we apply the formulation to the dynamics of a hydrogen atom and show that the intrinsic spin angular momentum of the electron can take half-integral values and, in particular, the intrinsic mass of the electron can take negative values. We also consider a further extension by generalising the formulation so that it can be used to describe other intrinsic dynamics that may associate with a quantum particle, for example, when a hydrogen atom radiates a photon, the photon associated with the electron may also possess an intrinsic dynamics that can be described by an intrinsic wave equation that has a similar form to that for the electron. 展开更多
关键词 Spin Angular Momentum Spin Dynamics Orbital Angular Momentum Schrodinger Equation Half-Integer Values intrinsic Coordinate Systems Negative mass
下载PDF
用快速特性粘度法研究聚碳酸酯的热降解机理 被引量:7
13
作者 浦鸿汀 张先禹 张庆伟 《建筑材料学报》 EI CAS CSCD 2004年第3期360-364,共5页
通过快速特性粘度法研究聚碳酸酯(PC)在恒温条件下降解不同时间的粘均分子量,进而研究其降解机理和动力学方程.认为PC的整个降解过程可分为吸收氧气、酯交换和自由基反应3个阶段.对第1阶段———吸氧阶段和第2阶段———酯交换阶段的降... 通过快速特性粘度法研究聚碳酸酯(PC)在恒温条件下降解不同时间的粘均分子量,进而研究其降解机理和动力学方程.认为PC的整个降解过程可分为吸收氧气、酯交换和自由基反应3个阶段.对第1阶段———吸氧阶段和第2阶段———酯交换阶段的降解机理和动力学方程进行了详细的研究. 展开更多
关键词 聚碳酸酯 特性粘度 热降解 研究 酯交换 降解机理 分子量 动力学方程 自由基反应 氧气
下载PDF
粘度法测定聚对苯二甲酸丙二酯分子质量的研究 被引量:8
14
作者 李爱萍 韩文俊 +2 位作者 陈玉顺 何进章 蔡夫柳 《聚酯工业》 CAS 2001年第2期19-22,共4页
采用外推法和一点法测定PTT特性粘度 ,结果表明采用一点法操作较简单 ,并拟合出重均分子质量与特性粘度之间关系式。
关键词 PTT 特性粘度 重均分子质量 聚对苯二甲酸丙二酯 分子质量 粘度法
下载PDF
基于向量式有限元的三角形薄板单元 被引量:8
15
作者 王震 赵阳 胡可 《工程力学》 EI CSCD 北大核心 2014年第1期37-45,共9页
向量式有限元是一种基于点值描述和向量力学理论的新型分析方法。该文基于向量式有限元基本原理,推导了三角形DKT薄板单元的基本公式,详细阐述了通过逆向运动处理薄板单元的平面内、外刚体位移从而获得单元节点纯变形位移的过程,以及进... 向量式有限元是一种基于点值描述和向量力学理论的新型分析方法。该文基于向量式有限元基本原理,推导了三角形DKT薄板单元的基本公式,详细阐述了通过逆向运动处理薄板单元的平面内、外刚体位移从而获得单元节点纯变形位移的过程,以及进一步通过变形坐标系获得单元节点内力的求解方法;同时对质点的质量矩阵与惯性矩阵、应力计算的数值积分及插值方法、时间步长及阻尼参数的取值等问题提出了合理可行的处理方式。在此基础上编制了薄板单元的计算分析程序,并进行了算例验证。算例分析表明所编制的向量式有限元薄板单元程序可以很好地完成平板结构的静、动力分析,验证了理论推导的正确性和分析程序的可靠性。该文成果为进一步建立向量式有限元薄壳单元理论打下了必要的基础。 展开更多
关键词 平板结构 向量式有限元 DKT薄板单元 质量矩阵 阻尼参数
原文传递
针灸联合内养功对慢性盆腔炎患者盆腔包块直径和子宫动脉血流动力参数的影响
16
作者 杨春香 邸志芳 +1 位作者 刘新 肖远德 《辽宁中医杂志》 CAS 北大核心 2024年第1期183-187,共5页
目的针灸联合内养功治疗慢性盆腔炎对患者盆腔包块直径和子宫动脉血流动力参数的影响。方法将86例慢性盆腔炎患者以1∶1比例随机分为对照组和观察组各43例,对照组予以常规西医基础治疗,观察组在对照组的西医用药基础上加予针灸联合内养... 目的针灸联合内养功治疗慢性盆腔炎对患者盆腔包块直径和子宫动脉血流动力参数的影响。方法将86例慢性盆腔炎患者以1∶1比例随机分为对照组和观察组各43例,对照组予以常规西医基础治疗,观察组在对照组的西医用药基础上加予针灸联合内养功治疗,评估两组治疗1个月经周期后的临床疗效,对比两组治疗前及治疗1个月经周期后的中医症状评分、最大肿块直径、疼痛程度[视觉模拟评分法(VAS)]、子宫动脉血流动力参数[子宫动脉血管搏动指数(PI)和血管阻力指数(RI)、收缩期峰流速度(Vs)]及血清炎症指标[补体C_(3)、单核细胞趋化蛋白-1(MCP-1)及转化生长因子-TGF-β1(TGF-β1)]水平。结果观察组的的临床总有效率显著高于对照组(88.37%vs 69.77%,P<0.05);治疗后,两组关于腹部疼痛、腰部疼痛、白带色黄共3项中医症状评分相比治疗前均有显著性下降(P<0.05),两组的最大肿块直径和VAS评分相比治疗前均显著降低(P<0.05),两组的PI、RI及Vs值均较治疗前有显著性增加(P<0.05),两组的血清补体C_(3)、MCP-1水平较治疗前有显著性降低(P<0.05),血清TGF-β1水平较治疗前有显著性提升(P<0.05),以上指标观察组的变化幅度显著大于对照组(P<0.05);两组不良反应总发生率无显著性差异(P>0.05);观察组疾病复发率显著低于对照组(4.65%vs 18.60%,P<0.05)。结论针灸联合内养功治疗慢性盆腔炎的疗效显著,能明显改善中医相关症状,缩小盆腔包块直径,并减少腰腹痛感,改善子宫动脉血流动力参数,并能纠正机体血清炎症反应,不良反应少,复发率低。 展开更多
关键词 慢性盆腔炎 针灸 内养功 盆腔包块直径 子宫动脉血流动力参数
下载PDF
含氮量、温度、有机溶剂对硝化纤维素溶液特性黏度的影响 被引量:6
17
作者 黄小锐 罗庆平 +2 位作者 李兆乾 祁栋梁 朱娟 《西南科技大学学报》 CAS 2018年第4期31-36,共6页
通过乌氏黏度计测试了硝化纤维素溶液的特性黏度,以凝胶渗透色谱(GPC)对硝化纤维素的分子量及分子量分布进行了表征,研究了含氮量、溶液温度、有机溶剂对硝化纤维素溶液特性黏度的影响。结果表明:随着硝化纤维素的含氮量上升,其特性黏... 通过乌氏黏度计测试了硝化纤维素溶液的特性黏度,以凝胶渗透色谱(GPC)对硝化纤维素的分子量及分子量分布进行了表征,研究了含氮量、溶液温度、有机溶剂对硝化纤维素溶液特性黏度的影响。结果表明:随着硝化纤维素的含氮量上升,其特性黏度逐渐增大,但当其含氮量继续上升到一定值时,其特性黏度反而减小;硝化纤维素的含氮量对其特性黏度的影响实际上体现在其分子量对特性黏度的影响上,硝化纤维素的特性黏度与其分子量具有一定的依赖性关系,其特性黏度随硝化纤维素分子量的增加而增大;温度越高,硝化纤维素的特性黏度越小;溶剂极性越小,其特性黏度越大。当硝化纤维素溶解于DMF溶剂中时,其分子链具有一定的刚性。 展开更多
关键词 硝化纤维素 特性黏度 分子量 溶剂
下载PDF
基于δ^(13)C估算水分利用效率的2种模型比较——以峨眉山雷洞坪植物为例
18
作者 陈淼 刘顺 +2 位作者 许格希 陈健 史作民 《陆地生态系统与保护学报》 2024年第2期14-23,共10页
【目的】通过对基于碳稳定同位素值(δ^(13)C)估算水分利用效率(iWUE)的2种模型(是否考虑叶肉导度,gm)之间差异的研究,有助于进一步理解gm对植物iWUE的影响。【方法】选择峨眉山雷洞坪针阔混交林中不同生长型植物,采集了48个物种的117... 【目的】通过对基于碳稳定同位素值(δ^(13)C)估算水分利用效率(iWUE)的2种模型(是否考虑叶肉导度,gm)之间差异的研究,有助于进一步理解gm对植物iWUE的影响。【方法】选择峨眉山雷洞坪针阔混交林中不同生长型植物,采集了48个物种的117个叶片样品,通过测定其叶片δ^(13)C,对比了早期估算iWUE模型(iWUEsim模型,将gm看作无穷大)与包含gm效应的iWUE模型(iWUEmes模型)之间的iWUE差异(iWUE_(difference)),以及这种差异随植物生长型变化的趋势。【结果】结果显示,iWUEsim的平均值(42.23±1.33μmol·mol^(-1))显著高于iWUEmes的平均值(28.10±0.65μmol·mol^(-1)),高估比例为3.64%~72.11%(平均49.58%±1.30%)。不同生长型植物的iWUEsim均显著大于iWUEmes,其中草本植物高估比例3.64%~48.00%(平均29.20%±5.16%),灌木高估比例13.68%~67.73%(平均48.44%±1.83%),乔木高估比例32.04%~72.11%(平均54.08%±1.47%)。此外,叶片功能性状对iWUE_(difference)有显著影响,相比于叶片厚度、叶片干物质含量和单位质量叶片氮含量,单位面积叶片氮含量和比叶重是影响iWUE_(difference)变化的主要因素。【结论】将gm看作无穷大会造成对基于δ^(13)C估算的iWUE的高估,未来估算植物iWUE时应考虑gm的影响。 展开更多
关键词 内在水分利用效率 叶肉导度 碳稳定同位素 植物生长型 单位面积叶片氮含量 比叶重
下载PDF
The Inner Structure of the Intrinsic Electron and the Origin of Self-Mass
19
作者 Victor Vaguine 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2023年第1期174-189,共16页
A brief review and analysis of two historical models of the electron, the charged spinning sphere and Goudsmit and Uhlenbeck’s concept, is presented. It is shown that the enormous potential of classical electrodynami... A brief review and analysis of two historical models of the electron, the charged spinning sphere and Goudsmit and Uhlenbeck’s concept, is presented. It is shown that the enormous potential of classical electrodynamics has been underutilized in particle physics. Such observation leads to discovery of a principal component in the electron inner structure—the charged c-ring. The intrinsic (fundamental) electron model based on the charged c-ring successfully explains the ontology of the charge fractionation in quantum chromodynamics and the formation of Cooper pairs in superconductivity. The c-ring properties are explained on the basis of the General Compton Conditions as defined. Properties of the charged c-ring include the explanation of the boundary conditions, electro-magnetostatic field configuration, self-mass, spin, magnetic moment, and the gyromagnetic ratio. The self-mass of the intrinsic electron is 100% electro-magnetostatic and it is shown how to compute its value. The classical-quantum divide no longer exists. Relation between the intrinsic electron and the electron is fundamentally defined. The electron is the composite fermion consisting of the intrinsic electron and the neutrino. The ontology of the anomaly in the electron magnetic moment is demonstrated—it is due to the addition of the neutrino magnetic moment to the overall electron magnetic moment. The intrinsic electron replaces the W? boson in particle physics, resulting in a fundamental implication for the Standard Model. 展开更多
关键词 intrinsic Electron Inner Structure Electro-Magnetostatic Self-mass General Compton Conditions Charged C-Ring Visualization C-Ring Length Constant
下载PDF
不同百合样品中13种内源性游离糖的含量分析 被引量:5
20
作者 孔滢 王欢 +2 位作者 郎利新 窦晓莹 白锦荣 《食品科学》 EI CAS CSCD 北大核心 2021年第10期249-254,共6页
采用气相色谱-质谱联用技术对15份不同产地的百合样品中13种内源性游离态的单糖和二糖进行含量分析。结果显示,所有百合样品中含量最高的3种游离糖为蔗糖、葡萄糖和果糖;其中蔗糖含量在大部分样品中占到游离糖总含量的86%以上。与同一... 采用气相色谱-质谱联用技术对15份不同产地的百合样品中13种内源性游离态的单糖和二糖进行含量分析。结果显示,所有百合样品中含量最高的3种游离糖为蔗糖、葡萄糖和果糖;其中蔗糖含量在大部分样品中占到游离糖总含量的86%以上。与同一产地的卷丹鳞茎相比,卷丹珠芽中的多种游离糖含量更高。与新鲜鳞茎相比,百合干中的游离糖总含量明显降低、游离糖种类增多。在食用药用百合中,兰州百合鳞茎和山丹鳞茎的甜度值最高,卷丹鳞茎、龙牙百合鳞茎和兰州百合干的甜度值为中等水平,龙牙百合干的甜度值最低。聚类分析结果显示同一种百合的鳞茎样品多聚类为一组;主成分分析结果显示山丹、兰州百合和岷江百合的鳞茎在多种游离糖的含量上较为突出。紫色的岷江百合鳞茎和卷丹珠芽中的葡萄糖和果糖含量较高,可能与花青苷的积累有关。本研究为百合产品进一步开发提供参考。 展开更多
关键词 百合 内源性游离糖 气相色谱-质谱联用 聚类分析 主成分分析
下载PDF
上一页 1 2 下一页 到第
使用帮助 返回顶部