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扩容角对圆形巷道岩爆过程的影响

王学滨,潘一山,张智慧

《中国工程科学》 2010年第12卷第2期页码 40-46

摘要：模拟结果表明，随着扩容角的增加，剪切带变宽，岩爆坑变深，破坏单元数目增多，破坏区变大。当扩容角较低时，高剪切应变集中于“狗耳”形岩爆坑位置，剪切带与巷道周边切线之间的夹角较大；当扩容角较高时，高剪切应变集中于巷道周边的一些位置上，剪切带与巷道周边切线之间的夹角较小

关键词：扩容角圆形巷道岩爆剪切带 V形坑剪切应变体积应变

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含腐蚀坑结构损伤演化评估过程

任克亮,吕国志

《中国工程科学》 2007年第9卷第9期页码 63-67

摘要：得到了确定尺寸腐蚀坑底部在疲劳载荷作用下产生非扩展裂纹的萌生寿命值；采用断裂力学模型通过求解数值积分和非线性方程，得到了微裂纹扩展到极限尺寸的寿命值和等效裂纹的尺寸；采用神经网络技术建立了腐蚀坑尺寸与等效裂纹尺

关键词：腐蚀坑有限元方法局部应力应变蒙特卡罗方法神经网络

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分形模型参数与粗糙度参数R_a关系的研究

潘玉良,吴立群,张云电

《中国工程科学》 2004年第6卷第5期页码 49-51

摘要：

介绍了W－M分形模型参数（D,G,γ）的物理含义，研究了分形参数（D,G,γ）与粗糙度参数R_a之间的联系，导出了分形参数（D,G,γ）与粗糙度参数

关键词： W－M分形模型分形参数粗糙度R_a

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板形计法的定义及实验应用

张进之,段春华,朱健勤

《中国工程科学》 2001年第3卷第12期页码 47-51

摘要：

板形测控数学模型、解析板形刚度理论和板形板厚协调规律的综合称为板形计法。采用两种实验方式验证了板形计法的正确性和实用性，其一是通过轧铝板实验，计算轧机板形刚度和轧件板形刚度，由实测铝板凸度验证板形刚度方程；其二是由CVC板形控制热连轧机实测数据，用离线计算自适应系数的方法验证板形测控数学模型

关键词：板形计法板形刚度方程测控数学模型后计算自适应

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拟共形映射图像特征匹配 Article

Chun-xue WANG, Li-gang LIU

《信息与电子工程前沿（英文）》 2017年第18卷第5期页码 644-657 doi: 10.1631/FITEE.1500411

摘要：该问题可转化为包含Beltrami系数（BC）项和拟共形映射的约束最优化问题。该问题可通过变量分裂迭代算法有效求解。算法的迭代涉及线性系统和线性约束凸二次规划两子问题。

关键词：特征匹配；拟共形映射；分裂算法

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Autoimmunity in acute ischemic stroke and the role of blood—brain barrier: the dark side or the light one?

Nikolay V. Tsygan, Alexandr P. Trashkov, Igor V. Litvinenko, Viktoriya A. Yakovleva, Alexandr V.

《医学前沿（英文）》 2019年第13卷第4期页码 420-426 doi: 10.1007/s11684-019-0688-6

摘要： This article presents a synopsis of the current data on the mechanisms of blood—brain barrier (BBB) alteration and autoimmune response in acute ischemic stroke. Most researchers confirm the relationship between the severity of immunobiochemical changes and clinical outcome of acute ischemic stroke. Ischemic stroke is accompanied by aseptic inflammation, which alters the brain tissue and exposes the co-stimulatory molecules of the immune system and the neuronal antigens. To date, BBB is not considered the border between the immune system and central nervous system, and the local immune subsystems are found within and behind the BBB. BBB disruption contributes to the leakage of brain autoantigens and induction of secondary autoimmune response to neuronal antigens and long-term inflammation. Glymphatic system function is altered and jeopardized both in hemorrhagic and ischemic stroke types. The receptors of innate immunity (toll-like receptor-2 and toll-like receptor-4) are also involved in acute ischemia—reperfusion injury. Immune response is related to the key processes of blood clotting and fibrinolysis. At the same time, the stroke-induced immune activation may promote reparation phenomena in the brain. Subsequent research on the reduction of the acute ischemic brain injury through the target regulation of the immune response is promising.

关键词： stroke blood–brain barrier autoimmunity innate immunity inflammation cell death

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掺梳形减水剂水泥浆体早期水化产物形貌研究

蒋亚清

《中国工程科学》 2011年第13卷第9期页码 69-75

摘要：

为揭示梳形减水剂对水泥早期水化的影响规律，指导工程应用,通过SEM分析，研究了掺用3种典型结构的梳形减水剂的水泥浆体早期水化产物形貌及其电子特征数据结果表明，梳形减水剂加速了水泥早期水化反应，且丙烯酸类、马来酸类共聚物分别促进了AFt、AFm的形成。因此，梳形减水剂品种对水泥早期水化和混凝土工程性能具有较大影响，应根据使用要求合理选用，必要时与缓凝剂、引气剂或消泡剂复合使用。

关键词：梳形减水剂水泥水化钙矾石微观形貌

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Emulsification for castor biomass oil

Dongxiang ZHANG, Yuanping LIN, Anmei LI, V. V. TARASOV

《化学科学与工程前沿（英文）》 2011年第5卷第1期页码 96-101 doi: 10.1007/s11705-010-0553-2

摘要： The effect of the emulsifier formula on the stability of castor oil-water system was studied through compounding three groups of emulsifiers from the aspects of stability factor of absorbance, centrifuge stability, demulsification time in quiescence, appearance of the droplets, and viscosity. The best emulsifier formula for castor biomass oil was the composite formula of sorbitan monooleate and polyoxyethylene sorbitan monostearate. Correlation exists between the stability of emulsion and the viscosity/particle size of the droplets, with better stability in the case of greater viscosity or narrower distribution of particle size in the emulsion of castor oil-water system. Methanol added to the castor oil-water system may decrease the viscosity of the emulsion. Comparing the castor oil-water emulsion with methanol-castor oil-water emulsion, the optimal hydrophilic and lipophilic balance (HLB) value based on castor oil-water system was acquired between 6.6 and 7.5, while the optimal HLB value based on the methanol-castor oil-water system was between 5.5 and 6.0. The optimal HLB value of methanol-castor oil-water system gradually moved to that of castor oil-water emulsion with adding more water.

关键词： castor oil biomass oil emulsification stability viscosity corrosivity

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Synergistic effect of V and Fe in Ni/Fe/V ternary layered double hydroxides for efficient and durable

《化学科学与工程前沿（英文）》 2023年第17卷第1期页码 102-115 doi: 10.1007/s11705-022-2179-6

摘要： High-performance and stable electrocatalysts are vital for the oxygen evolution reaction (OER). Herein, via a one-pot hydrothermal method, Ni/Fe/V ternary layered double hydroxides (NiFeV-LDH) derived from Ni foam are fabricated to work as highly active and durable electrocatalysts for OER. By changing the feeding ratio of Fe and V salts, the prepared ternary hydroxides were optimized. At an Fe:V ratio of 0.5:0.5, NiFeV-LDH exhibits outstanding OER activity superior to that of the binary hydroxides, requiring overpotentials of 269 and 274 mV at 50 mA·cm^–2 in the linear sweep voltammetry and sampled current voltammetry measurements, respectively. Importantly, NiFeV-LDH shows extraordinary long-term stability (≥ 75 h) at an extremely high current density of 200 mA·cm^–2. In contrast, the binary hydroxides present quick decay at 200 mA·cm^–2 or even reduced current densities (150 and 100 mA·cm^–2). The outstanding OER performance of NiFeV-LDH benefits from the synergistic effect of V and Fe while doping the third metal into bimetallic hydroxide layers: (a) Fe plays a crucial role as the active site; (b) electron-withdrawing V stabilizes the high valence state of Fe, thus accelerating the OER process; (c) V further offers great stabilization for the formed intermediate of FeOOH, thus achieving superior durability.

关键词： oxygen evolution reaction electrocatalysts ternary layered double hydroxides long-term stability

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一种分形图像编码的新方法

王秀妮,姜威,王利村

《中国工程科学》 2006年第8卷第1期页码 54-57

摘要：

由于分形图像编码过程非常费时，因此在前人的基础上，通过分析影响分形图像编码速度的相关因素，提出了使用图像块的改进方差来提高分形压缩性能的思想。在证明迭代函数系统不会改变图像块的改进方差的基础上，给出了基于改进方差的分形图像压缩方法。实验结果说明该方法在保证快速性的同时，重建图像的质量又得到了进一步的提高。

关键词：分形编码图像压缩方差

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Association between ICU quality and in-hospital mortality of V-V ECMO-supported patients—the ECMO quality

《医学前沿（英文）》 doi: 10.1007/s11684-023-1014-x

摘要： This cohort study was performed to explore the influence of intensive care unit (ICU) quality on in-hospital mortality of veno-venous (V-V) extracorporeal membrane oxygenation (ECMO)-supported patients in China. The study involved all V-V ECMO-supported patients in 318 of 1700 tertiary hospitals from 2017 to 2019, using data from the National Clinical Improvement System and China National Critical Care Quality Control Center. ICU quality was assessed by quality control indicators and capacity parameters. Among the 2563 V-V ECMO-supported patients in 318 hospitals, a significant correlation was found between ECMO-related complications and prognosis. The reintubation rate within 48 hours after extubation and the total ICU mortality rate were independent risk factors for higher in-hospital mortality of V-V ECMO-supported patients (cutoff: 1.5% and 7.0%; 95% confidence interval: 1.05–1.48 and 1.04–1.45; odds ratios: 1.25 and 1.23; P = 0.012 and P = 0.015, respectively). Meanwhile, the V-V ECMO center volume was a protective factor (cutoff of ≥ 50 cases within the 3-year study period; 95% confidence interval: 0.57–0.83, odds ratio: 0.69, P = 0.0001). The subgroup analysis of 864 patients in 11 high-volume centers further strengthened these findings. Thus, ICU quality may play an important role in improving the prognosis of V-V ECMO-supported patients.

关键词： veno-venous extracorporeal membrane oxygenation in-hospital mortality high-volume centers quality control intensive care unit capacity parameters

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抛物形缓坡方程的数值研究

沈永明,郑永红,吴修广

《中国工程科学》 2004年第6卷第3期页码 30-35

摘要：

对2种典型的抛物形缓坡方程进行比较系统的数值研究。通过对4种典型地形上的波浪变形的数值模拟，详细讨论了网格节点数对数值解精度的影响、模型对初始入射角的敏感程度、非线性项对数值结果的影响等。研究结果可为实际应用抛物形缓坡方程研究大区域复杂地形上的波浪传播提供一定的理论指导。

关键词：抛物形缓坡方程数值研究波浪

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A concise review about fracture assessments of brittle solids with V-notches

Hsien-Yang YEH, Bin YANG

《结构与土木工程前沿（英文）》 2019年第13卷第2期页码 478-485 doi: 10.1007/s11709-019-0520-z

摘要：

A concise review of recent studies about the fracture assessments of elastic brittle solid materials containing V-notches is presented. In this preliminary and brief survey, elastic stress distributions in V-notched solids are discussed first. The concept of notch stress intensity factor is introduced. Combine the digital image correlation method with numerical computation techniques to analyze the stress distribution near the notches. Fracture criteria such as strain energy density, J-integral, theory of critical distance are used.

关键词： fracture assessment brittle solids V-notches review