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Hybrid intelligent water drop bundled wavelet neural network to solve the islanding detection by inverter-based

Mehrdad TARAFDAR HAGH,Homayoun EBRAHIMIAN,Noradin GHADIMI

《能源前沿（英文）》 2015年 第9卷 第1期   页码 75-90 doi: 10.1007/s11708-014-0337-3

摘要： In this paper, a passive neuro-wavelet based islanding detection technique for grid-connected inverter-based distributed generation was developed. The weight parameters of the neural network were optimized by intelligent water drop (IWD) to improve the capability of the proposed technique in the proposed problem. The proposed method utilizes and combines wavelet analysis and artificial neural network (ANN) to detect islanding. Connecting distributed generator to the distribution network has many benefits such as increasing the capacity of the grid and enhancing the power quality. However, it gives rise to many problems. This is mainly due to the fact that distribution networks are designed without any generation units at that level. Hence, integrating distributed generators into the existing distribution network is not problem-free. Unintentional islanding is one of the encountered problems. Discrete wavelet transform (DWT) is capable of decomposing the signals into different frequency bands. It can be utilized in extracting discriminative features from the acquired voltage signals. In passive schemes with a large non-detection zone (NDZ), concern has been raised on active method due to its degrading power quality effect. The main emphasis of the proposed scheme is to reduce the NDZ to as close as possible and to keep the output power quality unchanged. The simulation results from Matlab/Simulink shows that the proposed method has a small non-detection zone, and is capable of detecting islanding accurately within the minimum standard time.

关键词： islanding detection     neuro-wavelet     intelligent water drop (IWD)     non-detection zone (NDZ)     distributed generation (DG)    

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Experimental study on velocity characteristics of recirculation zone in humid air non-premixed flame

GU Xin, ZANG Shusheng, GE Bing

《能源前沿（英文）》 2008年 第2卷 第2期   页码 140-144 doi: 10.1007/s11708-008-0037-y

摘要： To examine the effect of the flow field within the recirculation zone on flame structure, the characteristic velocity fields of methane/humid air flame in non-premixed combustion behind a disc bluff-body burner were experimentally studied by particle image velocimeter (PIV).The results show that two stagnation points exist on the centerline in the recirculation zone flame. However, the distance of the two stagnation points in humid air combustion shortens, and the minimal dimensionless velocity increases compared with the conventional non-humid air combustion. In addition, the positional curves of the minimal velocities can be partitioned into three phases representing three different flame patterns. The analysis of axial minimal velocities on the centerline and their positions under different co-flow air velocity conditions reveals that fuel-to-air velocity ratio is the crucial parameter that governs humid air combustion flame characteristics.

关键词： distance     bluff-body     fuel-to-air velocity     stagnation     parameter    

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A systematic approach to ON-OFF event detection and clustering analysis of non-intrusive appliance load

Chuan Choong YANG,Chit Siang SOH,Vooi Voon YAP

《能源前沿（英文）》 2015年 第9卷 第2期   页码 231-237 doi: 10.1007/s11708-015-0358-6

摘要： The aim of non-intrusive appliance load monitoring (NIALM) is to disaggregate the energy consumption of individual electrical appliances from total power consumption utilizing non-intrusive methods. In this paper, a systematic approach to ON-OFF event detection and clustering analysis for NIALM were presented. From the aggregate power consumption data set, the data are passed through median filtering to reduce noise and prepared for the event detection algorithm. The event detection algorithm is to determine the switching of ON and OFF status of electrical appliances. The goodness-of-fit (GOF) methodology is the event detection algorithm implemented. After event detection, the events detected were paired into ON-OFF pairing appliances. The results from the ON-OFF pairing algorithm were further clustered in groups utilizing the -means clustering analysis. The -means clustering were implemented as an unsupervised learning methodology for the clustering analysis. The novelty of this paper is the determination of the time duration an electrical appliance is turned ON through combination of event detection, ON-OFF pairing and -means clustering. The results of the algorithm implementation were discussed and ideas on future work were also proposed.

关键词： non-intrusive appliance load monitoring     event detection     goodness-of-fit (GOF)     K-means clustering     ON-OFF pairing    

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Applying the multi-zone model in predicting the operating range of HCCI engines

Ming JIA, Maozhao XIE, Zhijun PENG,

《能源前沿（英文）》 2010年 第4卷 第3期   页码 414-423 doi: 10.1007/s11708-010-0108-8

摘要： In this paper, a multi-zone model is developed to predict the operating range of homogeneous charge compression ignition (HCCI) engines. The boundaries of the operating range were determined by knock (presented by ringing intensity), partial burn (presented by combustion efficiency), and cycle-to-cycle variations (presented by the sensitivity of indicated mean effective pressure to initial temperature). By simulating an HCCI engine fueled with iso-octane, the knock and cycle-to-cycle variations predicted by the model showed satisfactory agreement with measurements made under different initial temperatures and equivalence ratios; the operating range was also well reproduced by the model. Furthermore, the model was applied to predict the operating range of the HCCI engine under different engine speeds by varying the intake temperatures and equivalence ratios. The potential to extend the operating range of the HCCI engine through two strategies, i.e., variable compression ratio and intake pressure boosting, was then investigated. Results indicate that the ignition point can be efficiently controlled by varying the compression ratio. A low load range can be extended by increasing the intake temperature while reducing the compression ratio. Higher intake temperatures and lower compression ratios can also extend the high load range. Boosting intake pressure is helpful in controlling the combustion of the HCCI engine, resulting in an extended high load range.

关键词： homogeneous charge compression ignition (HCCI) engine     multi-zone     operating range    

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一种面向地面区域检测和目标跟踪的多传感器系统协同调度方法 Research Article

张昀普,付强,单甘霖

《信息与电子工程前沿（英文）》 2023年 第24卷 第2期   页码 245-258 doi: 10.1631/FITEE.2200121

摘要： 本文提出一种面向多任务协同的多传感器系统协同调度方法，并将其应用于地面区域检测和目标跟踪。调度的目的是选择最佳的传感器来完成分配的作战任务，并获得最佳作战收益。首先建立区域检测模型，并提出检测风险的计算方法以量化在调度中的检测收益。然后结合道路约束信息和多普勒盲区信息建立地面目标跟踪模型，并引入后验克拉美罗下限评估未来时刻的跟踪精度。最后，考虑检测、跟踪和能耗控制的需求建立目标函数，通过求解目标函数，得到最优的传感器调度方案。仿真结果表明，所提传感器调度方法可以选择合适的传感器完成所需作战任务，并在区域检测、目标跟踪和能耗控制方面均具有良好性能。

关键词： 传感器调度；区域检测；目标跟踪；道路约束；多普勒盲区    

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超声血流的无创伤检测和医学信号的特征提取

王威琪,汪源源,余建国,吴晓峰,刘斌,张羽,陈斯中,仪艳华,邵谦明

《中国工程科学》 2001年 第3卷 第2期   页码 52-64

摘要：

人体信号是随机性和背景噪声都很强的复杂信号。文章首先研究了利用超声Doppler技术定量检测血流速度的方法，然后将一些现代信息处理中的新理论、新方法引入医学超声的信息处理，为医学超声信息的特征提取提供了新的手段。这些理论包括：分形、数学形态学、数量化、小波变换、极点轨迹和血管传输线模型等。文章最后阐述了利用上述新方法作为技术核心而研制的三套应用系统；肺动脉血液动力学参数的无损估测系统、彩色编码的声谱系统和超声血流定量检测系统。

关键词： 超声血流     医学信号     无创伤检测     特征提取    

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早期监测肝细胞癌的新型非蛋白生物标志物 Review

Ghassan K. Abou-Alfa, 吴琳, Augusto Villanueva

《工程（英文）》 2021年 第7卷 第10期   页码 1369-1374 doi: 10.1016/j.eng.2021.02.020

摘要：

肝细胞癌（HCC）早期检测是对处于早期阶段的肝细胞癌进行检出的方法，对降低高风险患者的HCC死亡率至关重要。然而，对于早期HCC，目前仍然缺乏具有高度灵敏性和特异性的监测生物标志物。近年来，人们对循环系统中可检测到的肿瘤源性分子特征进行了大量研究，比如循环肿瘤脱氧核糖核酸（ctDNA）和循环肿瘤核糖核酸（ctRNA），以探讨它们作为多种肿瘤类型的候选非侵入性生物标志物的潜力。本文汇总了目前有关早期HCC检测的新方法及应用的研究。

关键词： 肝细胞癌     早期检测     生物标志物     液体活检    

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Effect of renal function and hemodialysis on the serum tumor markers in patients with chronic kidney disease

YU Xiaofang, XU Xialian, YE Zhibin

《医学前沿（英文）》 2007年 第1卷 第3期   页码 308-311 doi: 10.1007/s11684-007-0059-6

摘要： In patients with chronic renal failure, whether they have had hemodialysis or not, the specificity of some of the serum tumor markers for the diagnosis of the corresponding tumors is decreased while others remain as valuable as they are in patients with normal kidney function. The detection of tumor markers is extensively used for the diagnosis of corresponding tumors. It has been recently shown that some tumor markers are higher in patients with chronic kidney disease (CKD) than in the normal population. The effects of renal function and hemodialysis were examined on serum levels of some of the tumor markers including CEA, CA, CA, AFP, CA, CA, CYFRA, NSE, SCC-Ag, PSA, and fPSA. The 232 non-dialysis patients with CKD and 37 chronic uremic patients treated with maintenance hemodialysis were enrolled in this study. The 232 non-dialysis patients were divided into three groups according to their Ccr. In group 1, Ccr was ≤25 mL/min. In group 2, Ccr was between 25 and 50 mL/min. In group 3, Ccr was ≥50 mL/min. The male patients were also divided into three groups to compare the serum levels of PSA and fPSA among the three groups. Nine tumor markers in 37 uremic patients were tested. For comparison, 37 non-dialysis patients with similar Ccr of the same age and gender served as controls. There existed significant differences in serum levels of CEA, CA, CYFRA, NSE, and SCC-Ag among different Ccr groups and the markers bore a negative correlation with Ccr. There were no significant differences among the three groups in the serum concentrations of CA, AFP, CA, CA, PSA and fPSA. The serum levels of CA and NSE were significantly higher (199, CYFRA, NSE, CA and SCC-Ag for the diagnosis of the corresponding tumors was decreased while serum AFP, CA, CA, PSA and fPSA were as valuable as they were in patients with normal kidney function. Hemodialysis further increased the serum level of CA and NSE.

关键词： CKD     non-dialysis     valuable     detection     chronic    

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Electrochemical sensor investigation of carbon-supported PdCoAg multimetal catalysts using sugar-containing beverages

Firat Salman, Hilal C. Kazici, Hilal Kivrak

《化学科学与工程前沿（英文）》 2020年 第14卷 第4期   页码 629-638 doi: 10.1007/s11705-019-1840-1

摘要： Novel PdCoAg/C nanostructures were successfully synthesized by the polyol method in order to develop electrocatalysts, related to the glucose sensor performance of the high glycemic index in beverages. The characterization of this novel PdCoAg/C electrocatalyst was performed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and high-resolution transmission electron microscopy equipped with energy dispersive X-ray. The characterization results revealed that electronic state of the PdCoAg/C electrocatalyst was modified by the addition of the third metal. The electrochemical performances of the sensor were investigated by cyclic voltammetry and differential pulse voltammetry. The prepared enzyme-free sensor exhibited excellent catalytic activity against glucose with a wide detection range (0.005 to 0.35 mmol∙L ), low limit of detection (0.003 mmol∙L ), high sensitivity (4156.34 µA∙mmol ∙L∙cm ), and long-term stability (10 days) because of the synergistic effect between the ternary metals. The glucose contents of several energy drinks, fruit juices, and carbonated beverages were analyzed using the novel PdCoAg/NGCE/C sensor system. These results indicate the feasibility for applications in the foods industry.

关键词： non-enzymatic     glucose detection     ternary metals     glycemic index     beverages    

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delamination on the stiffness of composite pipes under compressive transverse loading using cohesive zone

Sattar MALEKI, Roham RAFIEE, Abolfazl HASANNIA, Mohammad Reza HABIBAGAHI

《结构与土木工程前沿（英文）》 2019年 第13卷 第6期   页码 1316-1323 doi: 10.1007/s11709-019-0555-1

摘要： The effect of delamination on the stiffness reduction of composite pipes is studied in this research. The stiffness test of filament wound composite pipes is simulated using cohesive zone method. The modeling is accomplished to study the effect of the geometrical parameters including delamination size and its position with respect to loading direction on stiffness of the composite pipes. At first, finite element results for stiffness test of a perfect pipe without delamination are validated with the experimental results according to ASTM D2412. It is seen that the finite element results agree well with experimental results. Then the finite element model is developed for composite pips with delaminated areas with different primary shapes. Thus, the effect of the size of delaminated region on longitudinal and tangential directions and also its orientation with respect to loading direction on delamination propagation and stiffness reduction of the pipes is assessed.

关键词： delamination     composite pipes     stiffness test     cohesive zone method    

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渤海辽东带地质认识的突破与金县1-1大油田的发现

邓运华

《中国工程科学》 2011年 第13卷 第10期   页码 13-18

摘要：

辽东带系指渤海辽中凹陷的东部陡坡带及辽东凸起，被辽中及辽东凹陷所夹持。辽东带油源条件好，东营组储—盖条件优越，断鼻、断块圈闭发育。但在2002年之前的15年内，国内外公司在辽东带进行了长期研究和勘探，钻了12口探井，没有发现商业油气田。经过对辽东带油气地质条件3年的深入研究，对每口失利井原因进行了再次分析，认识到该带发育东营组及沙河街组两套主力成藏组合，控制东营组成藏的主要因素是油气运移，而沙河街组能否成藏关键是储层。在此认识指导下选择研究方向，评价有利目标，经钻探发现了金县1-1大油田，储量达1.5×108 m3，充分显示了科研在油气勘探中的作用。

关键词： 渤海辽东带     金县1-1     地质认识     大油田    

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effects of mismatch fracture properties in encapsulation-based self-healing concrete using cohesive-zone

Luthfi Muhammad MAULUDIN, Chahmi OUCIF, Timon RABCZUK

《结构与土木工程前沿（英文）》 2020年 第14卷 第3期   页码 792-801 doi: 10.1007/s11709-020-0629-0

摘要： Finite element analysis is developed to simulate the breakage of capsule in capsule-based self-healing concrete. A 2D circular capsule with different core-shell thickness ratios embedded in the mortar matrix is analyzed numerically along with their interfacial transition zone. Zero-thickness cohesive elements are pre-inserted into solid elements to represent potential cracks. This study focuses on the effects of mismatch fracture properties, namely fracture strength and energy, between capsule and mortar matrix into the breakage likelihood of the capsule. The extensive simulations of 2D specimens under uniaxial tension were carried out to investigate the key features on the fracture patterns of the capsule and produce the fracture maps as the results. The developed fracture maps of capsules present a simple but valuable tool to assist the experimentalists in designing appropriate capsule materials for self-healing concrete.

关键词： self-healing concrete     interfacial zone     capsule materials     cohesive elements     fracture maps    

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Experimental investigation and design of aluminum columns with longitudinal welds

Yun WU, Qilin ZHANG

《结构与土木工程前沿（英文）》 2011年 第5卷 第3期   页码 366-373 doi: 10.1007/s11709-011-0101-2

摘要： This paper presents an experimental investigation of longitudinally welded aluminum alloy I-section columns subjected to pure axial compression. The specimens were fabricated using 6061-T6 heat-treated aluminum alloy. The test program included 20 column tests which were separated into 2 test series of different types of welding sections. Each test series contained 10 columns. All the specimens were welded using the Tungsten Inert Gas welding method. The length of the specimens ranged from 442 to 2433 mm in order to obtain a column curve for each test series. The observed failure mode for the column tests includes mainly flexural buckling around the minor axis and the major axis by applying support except for one column (ZP1217-1) which buckled in the local zone and some columns which failed in the weld. The test strengths were compared with the design strengths predicted by the European Code and China Code for aluminum structures. The purpose of this paper is to present the tests results of two typically longitudinally welded I-section columns, and to check the accuracy of the design rules in the current specifications.

关键词： aluminum alloy     longitudinal weld     heat-affected zone (HAZ)     reduced strength zone (RSZ)     buckling     column     experimental study    

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Cohesive zone model-based analyses of localized leakage of segmentally lined tunnels

《结构与土木工程前沿（英文）》 2023年 第17卷 第4期   页码 503-521 doi: 10.1007/s11709-023-0927-4

摘要： This paper presents a novel approach for simulating the localized leakage behavior of segmentally lined tunnels based on a cohesive zone model. The proposed approach not only simulates localized leakage at the lining segment, but also captures the hydromechanically coupled seepage behavior at the segmental joints. It is first verified via a tunnel drainage experiment, which reveals its merits over the existing local hydraulic conductivity method. Subsequently, a parametric study is conducted to investigate the effects of the aperture size, stratum permeability, and spatial distribution of drainage holes on the leakage behavior, stratum seepage field, and leakage-induced mechanical response of the tunnel lining. The proposed approach yields more accurate results than the classical local hydraulic conductivity method. Moreover, it is both computationally efficient and stable. Localized leakage leads to reduced local ground pressure, which further induces outward deformation near the leakage point and slight inward deformation at its diametrically opposite side. A localized stress arch spanning across the leakage point is observed, which manifests as the rotation of the principal stresses in the adjacent area. The seepage field depends on both the number and location of the leakage zones. Pseudostatic seepage zones, in which the seepage rate is significantly lower than that of the adjacent area, appear when multiple seepage zones are considered. Finally, the importance of employing the hydromechanical coupled mechanism at the segment joints is highlighted by cases of shallowly buried tunnels subjected to surface loading and pressure tunnels while considering internal water pressure.

关键词： segmentally lined tunnel     localized leakage     cohesive element     hydraulic behavior     numerical modeling    

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Simulation of cottonseed cake melt flow in metering zone of a single screw extruder

Hong HE, Jianguo ZHOU,

《化学科学与工程前沿（英文）》 2010年 第4卷 第3期   页码 263-269 doi: 10.1007/s11705-009-0276-4

摘要： Research on the extrusion of natural polymers (food, feed, etc.) is relatively new due to the complex physicochemical transformations of raw materials, although plastics melt conveying and transport have been well studied. The structure and composition, rheological behavior as well as extrusion processing of natural polymer are much more complicated. In this study, a quasi-three-dimensional (3D) fluid flow model for non-Newtonian, non-isothermal and undeveloped temperature was developed, the model prediction being in reasonably good agreement with the experiment. Results show that the influence of moisture content, among other process variables, is the most significant, followed by screw speed. Some interaction exists between these two variables and the screw speed effect becomes marginal at high moisture contents. In addition, viscosity change in the channel was studied.

关键词： quasi-three-dimensional     rheological     viscosity     processing     influence    

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标题 作者 时间 类型 操作

Hybrid intelligent water drop bundled wavelet neural network to solve the islanding detection by inverter-based

Mehrdad TARAFDAR HAGH,Homayoun EBRAHIMIAN,Noradin GHADIMI

期刊论文

Experimental study on velocity characteristics of recirculation zone in humid air non-premixed flame

GU Xin, ZANG Shusheng, GE Bing

期刊论文

A systematic approach to ON-OFF event detection and clustering analysis of non-intrusive appliance load

Chuan Choong YANG,Chit Siang SOH,Vooi Voon YAP

期刊论文

Applying the multi-zone model in predicting the operating range of HCCI engines

Ming JIA, Maozhao XIE, Zhijun PENG,

期刊论文

一种面向地面区域检测和目标跟踪的多传感器系统协同调度方法

张昀普,付强,单甘霖

期刊论文

超声血流的无创伤检测和医学信号的特征提取

王威琪,汪源源,余建国,吴晓峰,刘斌,张羽,陈斯中,仪艳华,邵谦明

期刊论文

早期监测肝细胞癌的新型非蛋白生物标志物

Ghassan K. Abou-Alfa, 吴琳, Augusto Villanueva

期刊论文

Effect of renal function and hemodialysis on the serum tumor markers in patients with chronic kidney disease

YU Xiaofang, XU Xialian, YE Zhibin

期刊论文

Electrochemical sensor investigation of carbon-supported PdCoAg multimetal catalysts using sugar-containing beverages

Firat Salman, Hilal C. Kazici, Hilal Kivrak

期刊论文

delamination on the stiffness of composite pipes under compressive transverse loading using cohesive zone

Sattar MALEKI, Roham RAFIEE, Abolfazl HASANNIA, Mohammad Reza HABIBAGAHI

期刊论文

渤海辽东带地质认识的突破与金县1-1大油田的发现

邓运华

期刊论文

effects of mismatch fracture properties in encapsulation-based self-healing concrete using cohesive-zone

Luthfi Muhammad MAULUDIN, Chahmi OUCIF, Timon RABCZUK

期刊论文

Experimental investigation and design of aluminum columns with longitudinal welds

Yun WU, Qilin ZHANG

期刊论文

Cohesive zone model-based analyses of localized leakage of segmentally lined tunnels

期刊论文

Simulation of cottonseed cake melt flow in metering zone of a single screw extruder

Hong HE, Jianguo ZHOU,

期刊论文