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Automatic Extraction Method of Weld Weak Defect Features for Ultra-High Voltage Equipment

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Energy Engineering 2023年第4期120卷 985-1000页

作者： guanghua zheng Chaolin Luo Mengen Shen Wanzhong Lv Wenbo Jiang Weibo Yang Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment School of Mechatronic EngineeringChina University of Mining and TechnologyXuzhou22116China Anji Chang Hong Chain Manufacturer Co. Ltd.Anji313300China Pearl RiverWater Resources Research Institute PRHRIGuangzhou510000China Henan Pinggao Electric Co. Ltd.Pinggao Group Co.Ltd.Pingdingshan467001China

To solve the problems of low precision of weak feature extraction,heavy reliance on labor and low efficiency of weak feature extraction in X-ray weld detection image of ultra-high voltage(UHV)equipment key parts,an automatic feature extraction algorithm is ***,the original weld image is denoised while retaining the characteristic information of weak defects by the proposed monostable stochastic resonance ***,binarization is achieved by combining Laplacian edge detection and Otsu threshold ***,the automatic identification of weld defect area is realized based on the sequential traversal of binary *** characteristic analysis dimensions are established for weld defects of UHV key parts,including defect area,perimeter,slenderness ratio,duty cycle,*** experiment using theweld detection image of the actual production site shows that the proposedmethod can effectively extract theweak feature information ofweld defects and further provide reference for decision-making.

关键词： UHV equipment weld nondestructive testing weak feature extraction

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基于全生命周期的电动汽车碳排放分析与评价

杭州电子科技大学学报（自然科学版） 2024年第3期44卷 51-58页

作者：金理军王关晴郑光华李春波丁宁杭州电子科技大学理学院浙江杭州310018

碳达峰、碳中和是国家实施的重要战略决策,而发展电动汽车是实现低碳的举措之一。针对现有电动汽车碳排放评估片面和不准确,以及未对碳排放数据的共性进行归纳分类问题,提出一种基于全生命周期的电动汽车碳排放核算模型和碳排放数据分... 详细信息

碳达峰、碳中和是国家实施的重要战略决策,而发展电动汽车是实现低碳的举措之一。针对现有电动汽车碳排放评估片面和不准确,以及未对碳排放数据的共性进行归纳分类问题,提出一种基于全生命周期的电动汽车碳排放核算模型和碳排放数据分类方法,并以理想L8为案例计算了其生命周期各阶段的碳排放量。研究结果表明,在电动汽车的生命周期的四个阶段中,汽车使用阶段的碳排放量占比最大,约为60.51%,其次是制造阶段、原材料获取阶段和报废回收阶段。该模型可以细化碳排放分析,提高降碳方案的精确性,且在实际案例分析中具有重要作用,有助于汽车行业开展碳足迹核算研究。

关键词：碳中和全生命周期电动汽车数据分类碳排放分析

7075铝合金切削加工晶粒尺寸演化过程研究

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廊坊师范学院学报（自然科学版） 2024年第2期24卷 57-61页

作者：郑广花刘孟阳张嘉慧黄留洋付宏鸽北华航天工业学院河北廊坊065000

金属材料在切削加工过程中,表层晶粒在机械载荷和热载荷的剧烈冲击作用下快速再结晶使表面形成晶粒细化层,该细化层严重影响材料使役性能。在研究切削加工晶粒尺寸演化机制的基础上,通过DEFORM仿真软件实现7075铝合金晶粒尺寸演化过程,... 详细信息

金属材料在切削加工过程中,表层晶粒在机械载荷和热载荷的剧烈冲击作用下快速再结晶使表面形成晶粒细化层,该细化层严重影响材料使役性能。在研究切削加工晶粒尺寸演化机制的基础上,通过DEFORM仿真软件实现7075铝合金晶粒尺寸演化过程,开展单因素法试验,构建了晶粒尺寸关于切削速度、进给量的预测模型。结果表明:切削速度增加,表层晶粒尺寸增大,细化层厚度减小;进给量增加,晶粒尺寸和细化层厚度在温度和塑性变形共同作用下先增加后减小。通过实验验证,该模型能够较为准确地预测材料表面晶粒尺寸。

关键词： 7075铝合金晶粒尺寸细化层 DEFORM

Effects of ultradry storage on fluidity of plasma membrane of seed

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Chinese Science Bulletin 1999年第11期44卷 1008-1014页

作者： Xiaofeng Wang guanghua zheng Shijie Yang Xinming Jing Chinese Agr Univ Coll Biol Sci Beijing 100094 Peoples R China Chinese Acad Sci Inst Bot Beijing 100093 Peoples R China

The effects of ultradry seed storage on the fluidity of plasma membrane have been investigated using the DPH fluorescent probe (1,6-diphenyi-1, 3, 5,-hexatriene). The results demonstrated that the micro-viscosity of plasma membrane of ultradried seeds has no significant changes compared with the seeds which were stored under -20℃ condition. However, there is a little adverse effect on the seeds with extreme dehydration. The results were consistent with higher vigor level of ultradried seed. It indicated that ultradry seed storage could maintain the physiological function of seed, protect the integrity of the membrane and improve the storability of seed. Furthermore, the results also revealed that sugar has the effect on protecting membrane structure and preserving the fluidity of the plasma membrane under seed dehydration. In the meantime, some mechanism about ultradry seed storage and the tolerance of dehydration of seed have been discussed.

关键词： ultradry storage fluorescent probe fluidity of plasma membrane Brassica chinensis Ulmus pumila.

Ultradry Seed Storage： Improved Strategy and Technology for Germplasm Conservation

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生物多样性 1994年第B11期2卷 61-65页

作者： zheng guanghua Beijing Botanical Garden Institute of Botany Academia Sinica. Beijing 100093

Two Indium(III)-based Fluorescent Metal-Organic Frameworks for Highly Sensing Fe^(3+),2,4-DNP,and TNP

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Chemical Research in Chinese Universities 2024年第1期40卷 119-126页

作者： WANG Dan LI Wen LI guanghua HUA Jia LIU Yunling State Key Laboratory of Inorganic Synthesis&Preparative Chemistry Jilin UniversityChangchun130012P.R.China

Two novel metal-organic frameworks(MOFs),JLU-MOF130([In(NH2−BDC)(Imi)(1H−Imi)]·DMF·H2O,NH2−H2BDC=2-aminobenzene-1,4-dicarboxylic acid,1H−Imi=1H-imidazole,DMF=N,N-dimethylformamide)and JLU-MOF131([In(1,4-NDC)(Imi)(1H−Imi)]·DMF0.5,1,4-H_(2)NDC=1,4-naphthalene-dicarboxylic acid),were ***-MOF130 features a three-dimensional(3D)architecture with a neb ***-MOF131 is characterized by a two-dimensional(2D)structure with an sql ***-MOF130 has excellent fluorescence detection performance towards Fe^(3+),2,4-dinitrophenol(2,4-DNP),and 2,4,6-trinitrophenol(TNP),but the fluorescence detection performance of JLU-MOF131 is further improved by converting NH2−H2BDC to more conjugated 1,4-H_(2)*** Stern-Volmer(SV)quenching constant(KSV)values of JLU-MOF130 sensing 2,4-DNP,TNP,and Fe^(3+)are 5.24×10^(4),4.44×10^(4),and 4.73×10^(3) L/mol,*** corresponding limit of detection(LOD)values are 1.17,1.36,and 14.59µmol/*** KSV values for JLU-MOF131 are 1.26×10^(5),9.02×10^(4),and 8.48×103 L/mol,and the corresponding LOD values are 0.35,0.42,and 3.60µmol/L,***,the emission wavelengths of the two MOFs obviously shift as the fluorescence emission intensities decrease upon the addition of 2,4-DNP and TNP,which can be applied in selective detection.

关键词： Metal-organic framework Fluorescence quenching Fe^(3+) 2 4-Dinitrophenol(2 4-DNP) 2 4 6-Trinitrophenol(TNP)

Efficacy and safety of Chinese herbal medicine as adjunctive therapy in sepsis patients with bloodstream infection:a propensity-matched analysis

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Journal of Traditional Chinese Medicine 2024年第1期44卷 197-204页

作者： ZHOU Xianshi ZHONG Minlin XI Xiaotu LI Jun TANG guanghua the Second Clinical College of Guangzhou University of Chinese Medicine Guangzhou 510120China Emergency Department Guangdong Provincial Hospital of Chinese MedicineGuangzhou 510120China Guangdong Provincial Key Laboratory of Research on Emergency in TCM Guangzhou 510120China Guangzhou Key Laboratory of Traditional Chinese Medicine for Prevention and Treatment of Emerging Infectious Diseases Guangzhou 510120China Administration Department the First Hospital of Guangzhou University of Chinese MedicineGuangzhou 510405China

OBJECTIVE:To investigate the efficacy and safety of Chinese herbal medicine in treating sepsis patients with bloodstream ***:A 6-year retrospective study was carried out at a university hospital in *** sepsis patients with bloodstream infection were *** primary outcome was 28-day mortality after *** score method was used to adjust for possible confounding.28-day mortality was estimated by KaplanMeier analysis and compared using the log-rank *** regression analysis was carried out to identify factors impacting in-hospital mortality ***:Following the application of the propensity score method,a total of 176 patients were *** all-cause 28-day mortality in the control group and Chinese herbal medicine group was 21.6%and 14.8%,***-Meier survival analysis showed that Chinese herbal medicine was associated with a lower hazard ratio(HR)in all-cause 28-day death compared with the control group[HR=0.44,95%CI(0.22,0.90),P0.05).Blood-activating and stasis-eliminating herb administration was associated with reduced inhospital mortality among sepsis patients with bloodstream infection[HR=0.54,95%CI(0.34,0.94),P<0.05].CONCLUSIONS:Chinese herbal medicine,especially the blood-activating and stasis-eliminating herb,might have certain efficacy and safety in treating sepsis patients with bloodstream *** should prescribe blood-activating and stasis-eliminating herb in treating these two coalescent critical diseases as long as no contraindications ***,further studies are needed to validate our results.

关键词： bacteremia medicine Chinese traditional herbal medicine sepsis propensity-matched analysis

Automatic modulation recognition of radiation source signals based on two-dimensional data matrix and improved residual neural network

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Defence Technology（防务技术） 2024年第3期33卷 364-373页

作者： guanghua Yi Xinhong Hao Xiaopeng Yan Jian Dai Yangtian Liu Yanwen Han Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China BIT Tangshan Research Institute Beijing 100081China

Automatic modulation recognition(AMR)of radiation source signals is a research focus in the field of cognitive ***,the AMR of radiation source signals at low SNRs still faces a great ***,the AMR method of radiation source signals based on two-dimensional data matrix and improved residual neural network is proposed in this ***,the time series of the radiation source signals are reconstructed into two-dimensional data matrix,which greatly simplifies the signal preprocessing ***,the depthwise convolution and large-size convolutional kernels based residual neural network(DLRNet)is proposed to improve the feature extraction capability of the AMR ***,the model performs feature extraction and classification on the two-dimensional data matrix to obtain the recognition vector that represents the signal modulation *** analysis and simulation results show that the AMR method based on two-dimensional data matrix and improved residual network can significantly improve the accuracy of the AMR *** recognition accuracy of the proposed method maintains a high level greater than 90% even at -14 dB SNR.

关键词： Automatic modulation recognition Radiation source signals Two-dimensional data matrix Residual neural network Depthwise convolution

An Effective Meshless Approach for Inverse Cauchy Problems in 2D and 3D Electroelastic Piezoelectric Structures

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Computer Modeling in Engineering & Sciences 2024年第3期138卷 2955-2972页

作者： Ziqiang Bai Wenzhen Qu guanghua Wu School of Automation Qingdao UniversityQingdao266071China School of Mathematics and Statistics Qingdao UniversityQingdao266071China Weifang University of Science and Technology Weifang262700China

In the past decade,notable progress has been achieved in the development of the generalized finite difference method(GFDM).The underlying principle of GFDM involves dividing the domain into multiple *** each sub-domain,explicit formulas for the necessary partial derivatives of the partial differential equations(PDEs)can be obtained through the application of Taylor series expansion and moving-least square approximation ***,the method generates a sparse coefficient matrix,exhibiting a banded structure,making it highly advantageous for large-scale engineering *** this study,we present the application of the GFDM to numerically solve inverse Cauchy problems in two-and three-dimensional piezoelectric *** our preliminary numerical experiments,we demonstrate that the proposed GFDMapproach shows great promise for accurately simulating coupled electroelastic equations in inverse problems,even with 3%errors added to the input data.

关键词： Generalized finite difference method meshless method inverse Cauchy problems piezoelectric problems electroelastic analysis