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Reconstruction from contour lines based on bi-cubic Bézier spline surface

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第7期7卷 1241-1246页

作者： li Zhong ma li-zhuang TAN Wu-zheng ZHAO Ming-xi Department of mathematics and Science Zhejiang Sci-Tech University Hangzhou 310018 China Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

A novel reconstruction method from contours lines is provided. First, we use a simple method to get rid of redundant points on every contour, then we interpolate them by using cubic Bézier spline curve. For corresponding points of different con- tours, we interpolate them by the cubic Bézier spline curve too, so the whole surface can be reconstructed by the bi-cubic Bézier spline surface. The reconstructed surface is smooth because every Bézier surface is patched with G2 continuity, the reconstruction speed is fast because we can use the forward elimination and backward substitution method to solve the system of tridiagonal equations. We give some reconstruction examples at the end of this paper. Experiments showed that our method is applicable and effective.

关键词： Contour Surface reconstruction Bi-cubic Bézier surface G^2 continuity

Feature-preserving mesh denoising based on contextual discontinuities

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第9期7卷 1603-1608页

作者： maO Zhi-hong ma li-zhuang ZHAO Ming-xi li Zhong Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200030 China

Motivated by the conception of Lee et al.(2005)’s mesh saliency and Chen (2005)’s contextual discontinuities, a novel adaptive smoothing approach is proposed for noise removal and feature preservation. Mesh saliency is employed as a multiscale measure to detect contextual discontinuity for feature preserving and control of the smoothing speed. The proposed method is similar to the bilateral filter method. Comparative results demonstrate the simplicity and efficiency of the presented method, which makes it an excellent solution for smoothing 3D noisy meshes.

关键词： Mesh denoising Feature preserving Contextual discontinuities Mesh saliency Bilateral filter

2型糖尿病患者中性粒细胞和淋巴细胞比值与血糖水平、并发症的相关性研究

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中国实用医药 2024年第13期19卷 75-78页

作者：马丽状王丽静孙维燕张筱玲荣成市石岛人民医院内分泌科 264308

目的研究2型糖尿病(T2DM)患者中性粒细胞和淋巴细胞比值(NLR)与血糖水平、并发症的相关性。方法选择125例T2DM患者为研究对象,其中50例单纯T2DM纳入T2DM组, 75例T2DM伴并发症(包括冠心病、糖尿病肾病、视网膜病变等)纳入T2DMC组;30例... 详细信息

目的研究2型糖尿病(T2DM)患者中性粒细胞和淋巴细胞比值(NLR)与血糖水平、并发症的相关性。方法选择125例T2DM患者为研究对象,其中50例单纯T2DM纳入T2DM组, 75例T2DM伴并发症(包括冠心病、糖尿病肾病、视网膜病变等)纳入T2DMC组;30例健康体检者纳入对照组。(1)比较T2DM组、TD2MC组、对照组的基线资料[性别、年龄、体质量指数(BMI)、病程、白细胞计数(WBC)、收缩压(SBP)、舒张压(DBP)、总胆固醇(TC)、甘油三酯(TG)、超敏C反应蛋白(hs-CRP)、中性粒细胞计数、淋巴细胞计数]、血糖指标[空腹血糖(FPG)、糖化血红蛋白(HbA1c)]、NLR;(2)依据NLR将125例T2DM患者分为低NLR组(NLR≤2.35, 45例)、高NLR组(NLR>2.35, 80例),对比两组在入院时及治疗3个月后血糖水平、并发症发生率;(3)分析T2DM患者NLR与血糖水平、并发症的相关性。结果三组WBC、TC、TG、FPG、HbA1c、hs-CRP、中性粒细胞计数、淋巴细胞计数及NLR比较有统计学意义(P2.35有80例。治疗后,两组FPG、HbA1c均较本组入院时下降(P<0.05);高NLR组入院时与治疗3个月后FPG(9.70±0.98)、(7.48±0.79)mmol/L和HbA1c(8.33±0.85)、(7.46±0.74)%均高于低NLR组的(9.25±0.96)、(7.15±0.74)mmol/L和(8.00±0.84)、(7.13±0.75)%,入院时hs-CRP(2.98±0.34)mg/L、Gensini血管粥样硬化评分(60.13±6.45)分及并发症发生率67.50%也明显高于低NLR组的(2.46±0.25)mg/L、(43.12±4.39)分、46.67%(P<0.05)。相关分析显示:T2DM患者NLR与入院时FPG、HbA1c呈正相关,与治疗3个月后FPG、HbA1c、并发症发生率也呈正相关(P<0.05)。结论 T2DM患者NLR与其血糖水平、并发症的发生有密切关系, NLR高预示血糖控制效果差,并发症发生风险高,可作为较好的预测指标。

关键词： 2型糖尿病中性粒细胞和淋巴细胞比值血糖并发症相关性

Variable refractive index in environment matte

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第7期7卷 1160-1167页

作者： ZHAO Ming-tian XIAO Shuang-jiu YANG Xu-bo ma li-zhuang Digital Art Laboratory Shanghai Jiao Tong University Shanghai 200240 China Department of Computer Science Shanghai Jiao Tong University Shanghai 200240 China

Environment matting and compositing is a technique to extract a foreground object, including color, opacity, reflec- tive and refractive properties, from a real-world scene, and synthesize new images by placing it into new environments. The description of the captured object is named environment matte. Recent matting and compositing techniques can produce quite realistic images for objects with complex optical properties. This paper presents an approximate method to transform the matte by simulating variation of the foreground object’s refractive index. Our algorithms can deal with achromatous-and-transparent ob- jects and the experimental results are visually acceptable. Our idea and method can be applied to produce some special video effects, which could be very useful in film making, compared with the extreme difficulty of physically changing an object’s refractive index.

关键词： Environment matting and compositing matte Refractive index Image-based rendering Environment map

Enhancement of low-temperature toughness of Fe-Mn-C-Al alloy by rare earth Ce-modified inclusions

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Journal of Iron and Steel Research International 2024年第1期31卷 157-173页

作者： Guang-kai Yang Chang-ling zhuang Yi-zhuang li Chen Hu Shao-bo li College of materials and Metallurgy Guizhou UniversityGuiyang550025GuizhouChina Department of Mechanical Engineering University of Hong KongHong Kong999077China The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina State Key Laboratory of Public Big Data Guizhou UniversityGuiyang550025GuizhouChina

Fe-Mn-C-Al alloys have been recognized as promising materials for certain low-temperature applications due to their exceptional mechanical properties and ***,their limited low-temperature toughness restricts their large-scale applications in specific *** influence of trace amounts of rare earth cerium(Ce)on the low-temperature toughness of Fe-18Mn-0.6C-1.8Al alloys was *** addition of Ce effectively alters the inclu-sions in the alloy,transforming large-sized irregular inclusions into fine ellipsoidal rare earth *** leads to a significant reduction in both the proportion and average size of the inclusions,resulting in their effective dispersion throughout the matrix and improved cryogenic *** presence of Ce-containing inclusions within the matrix reduces stress concentration,thereby inhibiting microcrack formation and improving impact absorption ***-cally,the addition of rare earth Ce alters the fracture behavior of the material at room temperature and low temperature,changing from brittle cleavage fracture to a more ductile failure *** impact toughness of the Fe-Mn-C-Al alloy is significantly improved by the addition of 0.0048 wt.%Ce,particularly at-196℃where the impact toughness reaches 103.6 J/cm^(2),representing an impressive improvement of 87.3%.

关键词： Fe-Mn-C-Al alloy Rare earth Low-temperature toughness Inclusion Fracture

Multi-Time-Scale Resource Allocation Based on Long-Term Contracts and Real-Time Rental Business Models for Shared Energy Storage Systems

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 454-465页

作者： Yuxuan zhuang Zhiyi li Qipeng Tan Yongqi li Minhui Wan College of Electrical Engineering Zhejiang UniversityHangzhouChina China Southern Power Grid Power Generation Company Energy Storage Research Institute GuangzhouChina IEEE

The push for renewable energy emphasizes the need for energy storage systems(ESSs)to mitigate the unpre-dictability and variability of these sources,yet challenges such as high investment costs,sporadic utilization,and demand mismatch hinder their broader *** response,shared energy storage systems(SESSs)offer a more cohesive and efficient use of ESS,providing more accessible and cost-effective energy storage solutions to overcome these *** enhance the profitability of SESSs,this paper designs a multi-time-scale resource allocation strategy based on long-term contracts and real-time rental business *** initially construct a life cycle cost model for SESS and introduce a method to estimate the degradation costs of multiple battery groups by cycling numbers and depth of discharge within the ***,we design various long-term contracts from both capacity and energy perspectives,establishing associated models and real-time rental ***,multi-time-scale resource allocation based on the decomposition of user demand is *** analysis validates that the business model based on long-term contracts excels over models operating solely in the real-time market in economic viability and user satisfaction,effectively reducing battery degradation,and leveraging the aggregation effect for SESS can generate an additional increase of 10.7%in net revenue.

关键词： Capacity allocation long-term contracts shared energy storage system stochastic programming

Enhancement of liquid-liquid micromixing performance in curved capillary microreactor by generation of Dean vortices

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Chinese Journal of Chemical Engineering 2024年第4期68卷 76-82页

作者： Shaoyun Wu zhuang ma Zichi Yang Suying Zhao Caijin Zhou Huidong Zheng Fujian Engineering Research Center of Advanced manufacturing Technology for Fine Chemicals College of Chemical EngineeringFuzhou UniversityFuzhou 350108China Qingyuan Innovation Laboratory Quanzhou362114China

Micromixing efficiency is an important parameter for evaluating the multiphase mass transfer performance and reaction efficiency of *** this work,the novel curved capillary reactor with different shapes was designed to generate Dean flow,which was used to enhance the liquid-liquid micromixing *** Villermaux-Dushman probe reaction was employed to characterize the micromixing performance in different curved capillary *** effects of experiment parameters such as liquid flow rate,inner diameter,tube length,and curve diameter on micromixing performance were systematically *** the optimal conditions,the minimum value of the segmentation factor XS was *** was worth noting that at the low Reynolds number(Remance with XS reduced by 37.5%.Further,the correlations of segment index XS with dimensionless factor such as Reynolds number or Dean number were developed,which can be used to predict the liquid-liquid micromixing performance in capillary microreactors.

关键词： Microreactor Process intensification Micromixing performance Dean flow

Generation of macroscopic entanglement in ensemble systems based on silicon vacancy centers

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CHINESE PHYSICS B 2024年第9期33卷 308-315页

作者： Wu, Jian-zhuang Xi, Ying li, Bo-Ya Lu, lian-E ma, Yong-Hong Inner Mongolia Univ Sci & Technol Inner Mongolia Peoples R China

Entanglement in macroscopic systems, as a fundamental quantum resource, has been utilized to propel the advancement of quantum technology and probe the boundary between the quantum and classical realms. This study focuses on a unique hybrid quantum system comprising of an ensemble of silicon vacancy (SiV) centers coupled to phononic waveguides in diamond via strain interactions. By employing two sets of time-dependent, non-overlapping driving fields, we investigate the generation process and dynamic properties of macroscopic quantum entanglement, providing fresh insights into the behavior of such hybrid quantum systems. Furthermore, it paves the way for new possibilities in utilizing quantum entanglement as an information carrier in quantum information processing and quantum communication.

关键词： quantum entanglement silicon vacancy centers diamond waveguide 03.67.Bg 61.72.-y SPIN STATE

Investigation on mechanical properties regulation of rock-like specimens based on 3D printing and similarity quantification

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International Journal of Mining Science and Technology 2024年第5期34卷 573-585页

作者： Duanyang zhuang Zexu Ning Yunmin Chen Jinlong li Qingdong li Wenjie Xu Center for Hypergravity Experiment and Interdisciplinary Research Zhejiang UniversityHangzhou 310058China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang UniversityHangzhou 310058China

3D printing is widely adopted to quickly produce rock mass models with complex structures in batches,improving the consistency and repeatability of physical *** is necessary to regulate the mechanical properties of 3D-printed specimens to make them proportionally similar to natural *** study investigates mechanical properties of 3D-printed rock analogues prepared by furan resin-bonded silica sand *** mechanical property regulation of 3D-printed specimens is realized through quantifying its similarity to sandstone,so that analogous deformation characteristics and failure mode are *** similarity conversion,uniaxial compressive strength,cohesion and stress–strain relationship curve of 3D-printed specimen are similar to those of *** the study ranges,the strength of 3D-printed specimen is positively correlated with the additive content,negatively correlated with the sand particle size,and first increases then decreases with the increase of curing *** regulation scheme with optimal similarity quantification index,that is the sand type of 70/140,additive content of 2.5‰and curing temperature of 81.6℃,is determined for preparing 3D-printed sandstone analogues and *** effectiveness of mechanical property regulation is proved through uniaxial compression contrast *** study provides a reference for preparing rock-like specimens and engineering models using 3D printing technology.

关键词： 3D printing Mechanical property regulation Similarity quantification Rock analogue Sandstone