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vector analysis of Contoura Vision for the correction of myopia and myopic astigmatism

International Journal of Ophthalmology(English edition) 2022年第6期15卷 983-989页

作者： Ying Lin Huan-Jun Su Mu-Zhi Yuan Yong Zhang Department of Optometry Liuzhou Worker’s HospitalLiuzhou 545005Guangxi Zhuang Autonomous RegionChina Department of Ophthalmology Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250000Shandong ProvinceChina

AIM: To evaluate the visual outcomes of Contoura Vision(CV) with automatic eye tracking system in eyes with myopia and myopic ***: This prospective study included 160 eyes(80 patients) with moderate myopia and irregular astigmatism between January and August 2018. Subjects were randomly divided into CV group(80 eyes) that under went CV femtosecond laser-assisted in situ keratomileusis(FS-LASIK) and a control group(80 eyes) that underwent wavefrontoptimized FS-LASIK. Visual outcomes and astigmatic vector analysis were evaluated and compared between preoperatively and 3 mo postoperatively. RESULTS: Basic details were similar in both groups(P>0.05). At 3 mo postoperatively, uncorrected distance visual acuity was 20/16, 20/20, and 20/25 in 24, 76, and 80 eyes of patients in CV group, respectively. The CV group was better in predictability of astigmatism correction at 3 mo postoperatively. In CV group, 64 eyes had deviation of astigmatic axis within 15° and 28 eyes had deviation of astigmatic axis within 5°, both were better than those in the control group. The number of eyes with residual astigmatism within 0.5 D were less in CV group(48 eyes) than the control group(40 eyes). Compared with the preoperative, C7 significantly reduced to 0.056±0.030 in CV group at 3 mo after the procedure(P<0.05), and were significantly lower than those in the control group(P<0.05).CONCLUSION: CV with automatic eye tracking system is safe and effective for the correction of myopia and myopic astigmatism.

关键词： vector analysis irregular astigmatism Contoura Vision

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Partial differential equations for computational science : with Maple and vector analysis / David Betounes.

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1998年

作者： David Betounes.

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Comparison of magnitude and summated vector mean of surgically induced astigmatism vector according to incision site after phakic intraocular lens implantation

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Eye and Vision 2021年第6期8卷 317-323页

作者： Kazutaka Kamiya Wakako Ando Masahide Takahashi Nobuyuki Shoji Visual Physiology School of Allied Health SciencesKitasato University1‑15‑1 KitasatoMinamiSagamiharaKanagawa 252‑0373Japan Department of Ophthalmology School of MedicineKitasato UniversitySagamiharaJapan

Background:To compare the arithmetic mean(M-SIA)and the summated vector mean of surgically induced astigmatism(SVM-SIA)according to the incision site after phakic intraocular lens(Visian implantable collamer lens(ICL),STAAR Surgical)***:This study comprised 121 eyes of 121 consecutive patients undergoing ICL surgery through a 3.0-mm temporal or superior clear corneal *** magnitude and the axis of corneal astigmatism preoperatively and 3 months postoperatively were measured using an automated *** M-SIA and the SVM-SIA were determined according to the incision ***:The magnitude of corneal astigmatism significantly increased from 1.23±0.59 D preoperatively to 1.46±0.72 D postoperatively in the temporal incision group(Wilcoxon signed-rank test,P<0.001),but it significantly decreased from 1.09±0.36 D preoperatively to 0.86±0.41 D postoperatively in the superior incision group(P<0.001).The M-SIA was 0.48±0.30 D,and the SVM-SIA was 0.23±0.52 D at a meridian of 82°in the temporal incision *** M-SIA was 0.57±0.30 D,and the SVM-SIA was 0.47±0.45 D at a meridian of 1°in the superior incision ***:ICL implantation induces the M-SIA by approximately 0.5 D,but the SVM-SIA decreased to 50%and 80%of the M-SIA in magnitude through temporal and superior incisions,*** direction of the SVM-SIA showed a tendency toward corneal flattening to the incisional *** should be noted that the M-SIA is somewhat different from the SVM-SIA according to the incision site.

关键词： Surgically induced astigmatism Corneal astigmatism Mean Summated vector mean Centroid vector analysis Temporal incision Superior incision ICL implantation

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Theoretical Study of Isotopic Effect of Oxygen Atom on the Stereodynamics for the O（^3P）＋ D2 → OD ＋ D Reaction

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Chinese Physics Letters 2010年第12期27卷 46-49页

作者：刘世莉石英 Institute of Atomic and Molecular Physics dilin University Changchun 130012

Quasi-classical trajectory theory is used to study the isotope effect of oxygen atoms on the vector correlations in the O（^3P）＋ D reaction at a collision energy of 25kcal/mol using accurate potential energy surface of the 3A＇ triplet state. The distributions of p（θr） and the distribution of dihedral angel p（φr） as well as p（θr,φr） are calculated. Moreover, four polarization-dependent generalized differential cross sections （PDDCSs） of product are presented in the center-of-mass frame. The results indicate that the polarization of the product presents different characters for the isotope effect of oxygen atoms. Isotopic substitute can cause obviously different effects on the four PDDCSs.

关键词： OXYGEN isotopes REACTION mechanisms (Chemistry) POTENTIAL energy surfaces DIFFERENTIAL cross sections vector analysis ATOMS

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Growth and nutrient dynamics of Betula alnoides seedlings under exponential fertilization

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Journal of Forestry Research 2018年第1期29卷 111-119页

作者： Lin Chen Chunsheng Wang Bernard Dell Zhigang Zhao Junjie Guo Daping Xu Jie Zeng The Experimental Center of Tropical Forestry Chinese Academy of Forestry Research Institute of Tropical Forestry Chinese Academy of Forestry Division of Research and Development Murdoch University

Betula alnoides is a fast-growing hardwood species grown in large plantations in Southeast Asia and South *** requirements for producing robus seedlings,growth and nutrient dynamics were investigated using exponential fertilization *** collar diameter,height,dry mass and nutrient contents of seedlings increased exponentially in all fertilization treatments as time ***,with water soluble fertilizer（Plant Products plus microelements N–P2O5–K2O：20–20–20）,300 mg N seedling-1was *** analysis revealed that P was the most responsive nutrient element followed by N and *** of N and K were evident in the plants without N addition,which induced initial P sufficiency and then luxury consumption probably due to the antagonistic interaction between N and *** deficiencies of N,P and K were mostly observed in al exponential regimes during the experiment because seedling growth rate exceeded nutrient uptake rate,inferring that further study on improving the nutrient uptake efficiency is *** of relationships among nutrient supply,dry mass,N content and N concentration demonstrated that 100–400 mg N seedling-1induced sufficiency to luxury consumption of nitrogen without significant change in dry mass,and 400 mg N seedling-1is recommended to apply for nutrient loading of seedlings before *** findings will help improve seedling quality and enhance the production of robust seedlings for plantation forestry of this species.

关键词： Betula alnoides Growth performance Luxury nutrient consumption Nitrogen requirement vector analysis

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From Discreteness to Continuity： Dislocation Equation for Two-Dimensional Triangular Lattice

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Chinese Physics Letters 2007年第1期24卷 143-146页

作者：王少峰 Institute for Structure and Function Chongqing University Chongqing 400044

A systematic method from the discreteness to the continuity is presented for the dislocation equation of the triangular lattice. A modification of the Peierls equation has been derived strictly. The modified equation includes the higher order corrections of the discrete effect which are important for the core structure of dislocation. It is observed that the modified equation possesses a universal form which is model-independent except the factors. The factors, which depend on the detail of the model, are related to the derivatives of the kernel at its zero point in the wave-vector space. The results open a way to deal with the complicated models because what one needs to do is to investigate the behaviour near the zero point of the kernel in the wave-vector space instead of calculating the kernel completely.

关键词： LATTICE theory CONTINUITY vector analysis vector spaces

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Taxonomic and phylogenetic composition show biotic resistance to exotic invasion in acid seep springs

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Ecological Processes 2021年第1期10卷 77-88页

作者： David F.Barfknecht David J.Gibson School of Biological Sciences Southern Illinois University–CarbondaleCarbondaleIL 62901-6509USA

Background:Few studies have incorporated the evolutionary insights provided by analysis of phylogenetic structure along with community composition to assess the effects of exotic invasion on freshwater ***,we assess the taxonomic and phylogenetic relationships among acid seep springs to investigate the potential homogenization or resistance of communities due to invasion of an exotic ***:Multivariate community analyses indicated differences in community and phylogenetic composition and dispersion among acid seep springs,associated with gradients in soil moisture,canopy cover,and phylogenetic *** contrast,univariate analyses showed differences in taxonomic diversity but not phylogenetic diversity among acid seep ***:Despite exotic invasion,individual acid seep springs remained taxonomically and phylogenetically distinct from each *** and phylogenetic diversity metrics revealed different aspects of composition,reinforcing the importance of including both in analyses of plant communities for understanding community assembly following exotic invasion and for management *** acid seep springs,taxonomic and phylogenetic composition appear to be driven more through environmental filtering by light and moisture than by the competitive effects following invasion of an exotic grass in support of Elton’s biotic resistance hypothesis.

关键词： Acid seep springs Diversity Community Phylogenetics Exotic invasion Environmental filtering NMDS UniFrac vector analysis

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Press cutting of thin-walled round pipe for producing curvilinear end

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Journal of Central South University 2012年第2期19卷 304-311页

作者：温彤陈霞 College of Materials Science and Engineering Chongqing University

In order to obtain a basic understanding of the unwanted distortions in the pipe wall during the press cutting process, the deformation of a thin-walled round pipe to form a curvilinear end was numerically and experimentally studied. vector analysis was used to study the relationship between the punch shape and the collapse of the cut-end. Stamping experiments on AISI 1020 steel pipe were conducted using different angles a and β defining the shape of the punch. The elasto-plastic finite element method that allows consideration of a ductile fracture was also employed to study the process. The results show that the deformation of the pipe end after press cutting is inβuenced mostly by the shape of the punch. A satisfactory quality of the curvilinear end of the pipe can be obtained if the appropriate geometric parameters of the punch are chosen. The pipe-wall collapse in the upper part of the section is decreased when a and β increase. The recommended values for a and β lie within 30°-50°. The hole on the underside of the punch has less inβuence on the quality of the cut-end, and the wall distortion and the generation of burr on the cut-end can be satisfactorily simulated using the fracture criterion of Brozzo or the normalized criterion of Cockcroft and Latham.

关键词： pipe press cutting vector analysis finite element method

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GRINDING OF DOUBLE DISC GRINDING MACHINE

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Chinese Journal of Mechanical Engineering 2005年第1期18卷 1-4页

作者： HuHuiqing 601RosemarieDriveArcadia California91107USA

The grinding of two parallel sides of a component is accomplished with theaccuracy and higher productivity by passing a blank through the truncated cone shape grinders, whichare turned angles. The machine is designated by the name of double disc grinding machine (DDGM).Usually, it is used in the mass production. The relationship between these angles, the accuracy,productivity, allowance and parameters of the machine and technology is explained in detail by math,such as vector analysis, transformation of 3D space coordinates, etc. Therefore, in the aspects ofqualitative and quantitative analyses, the grinding potential of DDGM is enormous increased andsuperior to conventional methods. Furthermore, the theoretical foundation of DDGM grinding designand technology is provided to improve, to expand and to create for future. The established machinedesign and practical experience of grinding technology will get great benefit by them.

关键词： Truncated cone shape vector analysis Qualitative and quantitative analysis

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Fuzzy Random Reliability analysis of Blocky Rock-Mass in Slopes

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Journal of China University of Mining and Technology 2005年第2期15卷 129-134页

作者： YANGKun ZHANGXin SchoolofWaterResourcesandHydropower WuhanUniversityWuhanHubei430072China NorthChinaInstituteofWaterConservancyandHydroelectricPower ZhengzhouHenan450008China

Slope stability assessment is a geotechnical problem characterized by many sources of uncertainty. In clas- sical reliability analysis, only the randomness of uncertainties is taken into account but the fuzziness of them is ignored. In this paper, a fuzzy probability approach and a fuzzy JC method are presented for the reliability analysis. The two methods have been applied to stability analysis of a certain slope of permanent ship lock in the Three-Gorges Project. The results obtained from these two methods are basically the same. However, compared with the fuzzy probability means, the fuzzy JC method can reflect the real situation better because it uses a fuzzy-based analysis applied to not only limit state equation but also mechanical parameters.

关键词： blocky rock mass vector analysis fuzzy-random reliability fuzzy failure probability

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