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Physics-based algorithm to simulate tree dynamics under wind load

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International Journal of Agricultural and Biological Engineering 2020年第2期13卷 26-32页

作者： Lifeng Xu Zhongzhu yang Weilong Ding Gerhard Buck-Sorlin College of Computer Science&technology Zhejiang University of TechnologyHangzhou 310026China IRHS INRAEAGROCAMPUS OUESTUniversitéd'AngersSFR 4207 QUASAV42 rue Georges Morel49071 BeaucouzécedexFrance

Rapid development in the different computer science fields during the recent decades has facilitated the creation of new applications in the area of dynamic simulation of plant *** these new applications,simulation of trees swaying in the wind is of great importance,as those computer graphics related areas,e.g.,computer games,tree cultivation and forest management simulations,help a lot in revealing the mechanisms of tree dynamics under wind ***,it is a big challenge to balance the effect of visualization in real time and calculation efficiency for any simulation algorithm.A physics-based algorithm to simulate tree dynamics under wind load was proposed in this study.A mechanistic model simulating the bending of a cantilever beam was used within the algorithm to simulate deformation of stems,and the algorithm was integrated with a landscape model in which different types of trees were constructed with an L-system-based *** results show that realistic dynamic effects can be achieved with reasonably high computational efficiency.

关键词： physics-based algorithm tree model L-system Cantilever beam

Numerical simulation of multi-scale cavitating flow with special emphasis on the influence of vortex on micro-bubbles

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Journal of Hydrodynamics 2022年第6期34卷 1032-1043页

作者： Ming-zhe Zhou Zi-yang Wang Xiao-rui Bai Huai-yu Cheng Bin Ji State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China

A multi-scale Euler-Lagrange method is applied in the current paper to investigate the characteristics of turbulent cloud cavitating flow around a Clark-y hydrofoil,in which macroscopic cavitating structures are simulated by volume of fluid(VOF)approach,while micro-scale bubbles are modelled based on Rayleigh-Plesset equation and bubble motion *** numerical results are in reasonable agreement with the available experiments,and the transition between multi-scale structures is captured *** evolution of microscopic bubble behaviors is statistically *** one typical cycle,numbers and Sauter mean radius of the bubbles show a similar variation tendency which both sharply spike to their maxima after the breakup of the sheet cavity,and then decrease continuously to their minima before the next *** bubbles are mainly concentrated at the tail of the attached cavity,in front of the cloud cavity and in the region quite close to the hydrofoil suction ***,vortices are extracted to account for the micro-scale *** is found that intense vortices aggravate turbulence fluctuation,thus spalling cavity to generate massive micro ***,the vortices provide microscopic bubbles low pressure and detain them so that numerous bubbles are able to *** effects are remarkable after the breakup of attached sheet cavity,owing to the violent vortices *** the contrary,when sheet cavity develops,the flow field becomes comparatively stable since the strong vortices travel *** micro-scale bubbles are produced,and their volume is generally small.

关键词： Cloud cavitation Euler-Lagrange method bubble-vortex interaction bubble dynamics

Application of pediatric ocular trauma score in pediatric open globe injuries

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International Journal of Ophthalmology(English edition) 2020年第7期13卷 1097-1101页

作者： Chao Xue Li-Chun yang yi-Chun Kong tianjin Eye Hospital Tianjin Key Laboratory of Ophthalmology and Visual ScienceTianjin Eye Institute Clinical College of Ophthalmology Tianjin Medical UniversityTianjinChina

AIM:to evaluate the predictive value of pediatric penetrating ocular trauma score(POtS)on the visual outcome in children with open globe ***:A retrospective study in 90 children(60 males and 30 females)aged 1-15 y(average,7.48±2.86 y)with penetrating ocular trauma was *** patient’s POtS was *** effects of POtS on final visual acuity(FVA)were *** between factors affecting POtS and the FVA was ***:All patients presented with single-eye *** follow-up time was 3-21 mo(average,10.23±3.54 mo).Among the 90 cases of penetrating wounds,71 eyes(78.89%)were injured in Zone I(wound involvement limited to the cornea,including the corneoscleral limbus),17 eyes(18.89%)were injured in Zone II(wound involving the sclera and no more posterior than 5 mm from the corneoscleral limbus),and 2 eyes(2.22%)were injured in Zone III(wound involvement posterior to the anterior 5 mm of the sclera).Analysis of POtS and FVA showed important correlation between them(r=0.414,P=0.000).Initial visual acuity(P=0.00),age(P=0.02),injury location(P=0.002),traumatic cataract(P=0.00),vitreous hemorrhage(P=0.027),retinal detachment(P=0.003),and endophthalmitis(P=0.03)were found to be statistically significant factors for the FVA ***:Ocular trauma presents serious consequences and poor prognosis in *** POtS may be a reliable prognostic tool in children with open globe injury.

关键词： the pediatric penetrating ocular trauma score children open globe injury predictive value

High speed small gauge anterior vitrectomy cutter for scleral fixated intraocular lens implantation

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International Journal of Ophthalmology(English edition) 2017年第1期10卷 77-80页

作者： yuan Bo Liang yoly y.y. FonG Lulu L. Cheng Alvin L. young Clinical and Epidemiological Eye Research Center the Affiliated Eye Hospital School of Optometry and OphthalmologyWenzhou Medical University Wenzhou 325027 ZhejiangProvince China Department of Ophthalmology ＆ Visual Sciences the ChineseUniversity of Hong Kong Prince of Wales Hospital ShatinHong Kong China

AIM： to report the outcomes of anterior vitrectomy using high speed cutter for scleral fixated intraocular lens （SFIOL） implantation in patients with posterior capsular rupture .MEtHODS： Medical records of 51 patients with posterior capsular rupture who received high speed cutter anterior vitrectomy via limbal incision with SFIOL implantation from June 2011 to December 2013 were reviewed retrospectively for visual outcomes and ***： totally 51 eyes of 51 patients were identified （23 males and 28 females）. Mean age at surgery was 67.2±15y （range 27-91y）, with mean follow-up of 23±8.2mo （range 12-40mo）. the 49 （96.1%） eyes had improvement or unchanged of final postoperative visual acuity. the most common complication was vitreous haemorrhage （5.9%） and transient rise in intraocular pressure （5.9%） which all spontaneously resolved CONCLUSION： High speed cutter anterior vitrectomy via limbal incision is a safe and effective method for those with posterior capsular rupture for SFIOL implantation.

关键词： cataract aphakia posterior capsular rupture intraocular lens scleral fixation

Estimates for Eigenvalues of Stochastic Matrices

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Acta Mathematicae Applicatae Sinica 2011年第3期27卷 503-508页

作者： Jia-li Zhou Min Wu Shu-you Zhang Guo-ping yang Department of Mathematics Zhejiang University of Technology Zhejiang 31(}023 China State Key Lab of CAD & CG Zhejiang University Zhejiang 310027 China Department of Mathematics Zhejiang University of Science &= Technology Zhejiang 310023 China College of Information technology Zhejiang Chinese Medical University Zhejiang 310053 China

It is well-known that the eigenvalues of stochastic matrices lie in the unit circle and at least one of them has the value one. Let {1, r 2 , ··· , r N } be the eigenvalues of stochastic matrix X of size N × N . We will present in this paper a simple necessary and sufficient condition for X such that ｜r j ｜〈 1, j = 2, ··· , N . Moreover, such condition can be very quickly examined by using some search algorithms from graph theory.

关键词： Directed graph eigenvalues spectral radius stochastic matrix

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西方社会学消费理论的经济学评析

消费经济 2006年第1期22卷 89-92,94页

作者：杨天宇中国人民大学公共管理学院北京100872

与经济学中的“代表性消费者”假设不同,社会学强调从社会分层的角度研究消费问题。本文对社会学家韦伯的阶层地位消费假说、西美尔的模仿消费理论、凡勃伦的炫耀性消费理论、布迪厄的资本-场域-惯习分析框架进行了述评,指出了他们的缺... 详细信息

与经济学中的“代表性消费者”假设不同,社会学强调从社会分层的角度研究消费问题。本文对社会学家韦伯的阶层地位消费假说、西美尔的模仿消费理论、凡勃伦的炫耀性消费理论、布迪厄的资本-场域-惯习分析框架进行了述评,指出了他们的缺陷和对于经济学家的可资借鉴之处,并提出了经济学消费理论的进一步发展方向。

关键词：社会学消费理论社会分层

一测多评法同时测定丁公藤不同炮制品中7个活性成分含量

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药物分析杂志 2024年第3期44卷 395-404页

作者：杨海玲李雲妃刘振杰陆星宇潘忠旭安徽医学高等专科学校合肥230601 广西中医药大学南宁530001

目的:建立一测多评法同时测定丁公藤及其炮制品中7个活性成分含量,并分析炮制对其影响。方法:采用超高效液相色谱法(UPLC),以绿原酸为参照物,建立新绿原酸、东莨菪苷、东莨菪内酯、异绿原酸B、异绿原酸A和异绿原酸C的相对校正因子。分... 详细信息

目的:建立一测多评法同时测定丁公藤及其炮制品中7个活性成分含量,并分析炮制对其影响。方法:采用超高效液相色谱法(UPLC),以绿原酸为参照物,建立新绿原酸、东莨菪苷、东莨菪内酯、异绿原酸B、异绿原酸A和异绿原酸C的相对校正因子。分别采用外标一点法和一测多评法测定上述7个活性成分含量,比较计算值与实测值的差异,以验证一测多评法的准确性和和可行性。结果:新绿原酸、东莨菪苷、绿原酸、东莨菪内酯、异绿原酸B、异绿原酸A、异绿原酸C分别在0.028~1.420、0.019~0.956、0.027~1.324、0.014~0.720、0.017~0.824、0.010~0.500和0.013~0.672μg·μL^(-1)范围内呈现良好线性关系,平均加样回收率(n=6)分别为98.9%、99.0%、100.6%、101.2%、100.8%、101.7%和100.5%,RSD分别为1.1%、1.7%、1.5%、1.6%、0.55%、1.6%和1.5%。采用校正因子计算的7个活性成分含量值与外标法实测值之间无显著差异。不同丁公藤饮片中新绿原5个有机酸(新绿原酸、绿原酸、异绿原酸B、异绿原酸A、异绿原酸C)含量变化趋势基本一致,y5(甘草汁-盐水煮品)含量最高,y10(甘草汁-盐水晒品Ⅱ)含量最低,东莨菪苷含量以y5含量最高(3.53 mg·g^(-1)),y10最低(0.31 mg·g^(-1))。东莨菪内酯含量以y7(甘草汁晒品Ⅰ)含量最高(1.48 mg·g^(-1)),y3(甘草汁煮品Ⅱ)含量最低(0.30 mg·g^(-1))。结论:以绿原酸为参照物建立的一测多评法可用于丁公藤饮片质量评价,加热和加辅料炮制均对丁公藤的化学成分产生了一定影响。

关键词：丁公藤炮制东莨菪苷东莨菪内酯新绿原酸绿原酸异绿原酸一测多评法

Retinoblastoma binding protein 4 up-regulation is correlated with hepatic metastasis and poor prognosis in colon cancer patients

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Hepatobiliary & Pancreatic Diseases International 2019年第5期18卷 446-451页

作者： yan-Dong Li Zhen Lv Hai-yang Xie Shu-Sen Zheng Division of Colon & Rectal Surgery First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China Department of Hepatobiliary and Pancreatic Surgery First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China

Background: Retinoblastoma binding protein 4 (RBBP4) plays an essential role in the development of multiple cancers. However, its relationship with prognosis in colon cancer and colon cancer hepatic metastasis has not been elucidated. the aim of this study was to explore the relationship between RBBP4 expression and prognosis of colon cancer patients and to evaluate RBBP4 as a new prognostic marker in these patients. Methods: Eighty colon cancer patients underwent surgical resection of the colon were enrolled. Among them, forty colon cancer patients suffered with hepatic metastasis. the colon cancer tissues, para-colon cancer tissues, and hepatic metastatic cancer tissues were collected from the pathological department for further analysis. the expression of RBBP4 proteins was examined by immunohistochemistry and correlated with clinicopathological parameters. the Cancer Genome Atlas (tCGA) database was used to validate the expression and explore its relationship with clinical characteristics. Results: RBBP4 was up-regulated in the colon cancer tissues compared with the para-colon cancer tissues. the analysis of tCGA database verified the upregulation of RBBP4 in the colon cancer tissues and RBBP4 overexpression was correlated with nerve invasion and poor outcomes of chemotherapy. Moreover, the positive rate of RBBP4 expression in 40 colon cancer patients with hepatic metastasis was higher in the hepatic metastatic cancer tissues (39/40, 97.5%) than in the colon cancer tissues (26/40, 65.0%). Our clinicopathological analysis showed that RBBP4 expression was significantly correlated with vascular invasion, hepatic metastasis, and lymph node involvement (all P tionally, the survival analysis demonstrated that RBBP4 over-expression was correlated with poor prognosis. Conclusions: RBBP4 was upregulated in the colon cancer. RBBP4 may be a novel predictor for poor prognosis of colon cancer and colon cancer hepatic metastasis.

关键词： Retinoblastoma binding protein 4 Colon cancer Hepatic metastasis

Characteristics of Amorphous Mn_3AlC Phases Formed by Mechanical Milling

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Journal of Materials Science & technology 1997年第2期13卷 149-153页

作者： Fuxing yIN Nanju GU (Hebei Institute of technology, tianin 300132, China)t.Shigematsu N.Nakanishi(Faculty of Science, Konan University Kobe 658, Japan)y.Osawa A.Sato(National Research Institute of Metals, tsukuba 305, Japan) Hebei Institute of technology Tianjin 300132 China Faculty of Science Konan University Kobe 658 Japan National Research Institute of Metals Tsukuba 305 Japan

Amorphization of Mn carbides by rapid quenching method has been proved to be *** mechanical milling in the present work, amorphous phases have been formed in the perovskitetype Mn3AlC compound. the transformation process from crystalline to amorphous phase was found to be milling time controlled, and 10 h is a critical period for the macroscopically single amorphous phase to form. It has been clarified that the redistribution of C atoms is an instinctive factor for amorphous phase to nucleate, and the atomic configuration in the amorphous phase is changed much in longer milling that different crystallizing behaviours have been caused. With X-ray diffraction and differential scanning calorimetry (DSC) results, an atomic configuration transition model is considered for the structures of the amorphous phases changed during milling.

关键词： Mn ta