Perturbed Solving Method for Interdecadal Sea-air Oscillator Model

A coupled system of the interdecadal sea-air oscillator model is studied. The E1 Nifio-southem oscillation （ENSO） atmospheric physics oscillation is an abnormal phenomenon involved in the tropical Pacific ocean-atmosphere interactions. The oscillator model is involved with the variations of both the eastern and western Pacific anomaly pat- terns. This paper proposes an ENSO atmospheric physics model using a method of the perturbation theory. The aim is to create an asymptotic solving method for the ENSO model. Employing the perturbed method, the asymptotic solution of corresponding problem is obtained, and the asymptotic behaviour of the solution is studied. Thus we can obtain the prognoses of the sea surface temperature anomaly and related physical quantities.

Singularly Perturbed Solution of Coupled Model in Atmosphere-ocean for Global Climate

A box model of the interhemispheric thermohaline circulation (THC) in atmosphere-ocean for global cli-mate is considered. By using the multi-scales method, the asymptotic solution of a simplified weakly nonlinear model is discussed. Firstly, by introducing first scale, the zeroth order approximate solution of the model is obtained. Sec-ondly, by using the multi-scales, the first order approximate equation of the model is found. Finally, second order ap-proximate equation is formed to eliminate the secular terms, and a uniformly valid asymptotic expansion of solution is decided. The multi-scales solving method is an analytic method which can be used to analyze operation sequentially. And then we can also study the diversified qualitative and quantitative behaviors for corresponding physical quantities. This paper aims at providing a valid method for solving a box model of the nonlinear equation.

Variational iteration solving method for El Nio phenomenon atmospheric physics of nonlinear model

A class of E1 Niйo atmospheric physics oscillation model is considered. The E1 Niйo atmospheric physics oscillation is an abnormal phenomenon involved in the tropical Pacific ocean-atmosphere interactions. The conceptual oscillator model should consider the variations of both the eastern and western Pacific anomaly patterns. An E1 Niйo atmospheric physics model is proposed using a method for the variational iteration theory. Using the variational iteration method, the approximate expansions of the solution of corresponding problem are constructed. That is, firstly, introducing a set of functional and accounting their variationals, the Lagrange multiplicators are counted, and then the variational iteration is defined, finally, the approximate solution is obtained. From approximate expansions of the solution, the zonal sea surface temperature anomaly in the equatorial eastern Pacific and the thermocline depth anomaly of the sea-air oscillation for E1 Niйo atmospheric physics model can be analyzed. E1 Niйo is a very complicated natural phenomenon. Hence basic models need to be reduced for the sea-air oscillator and are solved. The variational iteration is a simple and valid approximate method.

Homotopic Mapping Solving Method for Perturbed Mechanism of Western Boundary Undercurrents in Equator Pacific

The perturbed boundary undercurrent is an exceptional event in the tropical atmosphere and ocean. It is a complicated nonlinear system. Its appearance badly affects not only natural conditions such as climate and environment, but also global economic development and human living, and brings about many calamities. Thus there is very attractive study on its rules in the international academic circles. Many scholars made more studies on its local and whole behaviors using different methods, such as self-anamnestic principle, Fokker-Plank Equation method, higher order singular pedigree and predictable study, rapid change on boundary, indeterminate adaptive control, multi-eogradient method and so on. Nonlinear perturbed theory and approximate method are very attractive studies in the international academic circles. Many scholars considered a class of nonlinear problems for the ordinary differential equation, the reaction diffusion equations, the boundary value of elliptic equation, the initial boundary value of hyperbolic equation, the shock layer solution of nonlinear equation and so on. In this paper, a class of perturbed mechanism for the western boundary undercurrents in the equator Pacific is considered. Under suitable conditions, using a homotopic mapping theory and method, we obtain a simple and rapid arbitrary order approximate solution for the corresponding nonlinear system. For example, a special case shows that using the homotopic mapping method, there is a high accuracy for the computed value. It is also provided from the results that the solution for homotopic mapping solving method can be used for analyzing operator for perturbed mechanism of western boundary undercurrents in the equator Pacific.

抑制水通道蛋白4表达对脑缺血再灌注模型小鼠自噬和凋亡的影响

目的:探讨抑制水通道蛋白4(AQP4)表达对脑缺血再灌注模型小鼠自噬和凋亡的影响及其机制。方法:采用暂时性大脑中动脉闭塞(tMCAO)建立小鼠脑缺血再灌注损伤模型。将60只小鼠按随机数字表法分成假手术(sham)组、I/R组、AQP4抑制组和自噬抑制剂3-甲基腺嘌呤(3-MA)组,每组15只,sham组和I/R组腹腔注射生理盐水,AQP4抑制组和3-MA组分别腹腔注射AER-271(2 mg·kg^(-1)·d^(-1))和AER-271+3-MA(2 mg·kg_(-1)·d^(-1)),给药3 d,每天1次。观察各组小鼠神经功能Longa评分,记录体重变化;采用苏木精-伊红(HE)染色法观察脑梗死体积及组织病理变化;采用Western blot检测AQP4、LC3-Ⅱ、P62和cleaved caspase 3含量变化,采用免疫荧光法检测LC3-Ⅱ、P62、cleaved caspase-3与NeuN(神经元标志物)的共定位及表达情况。结果:I/R组与AQP4抑制组检测到大面积的脑梗塞和脑水肿,以及较高的Longa评分;与I/R组比较,AQP4抑制组的脑梗塞体积、脑水肿体积和Longa评分均显著降低(P<0.05);与sham组比较,I/R组的AQP4、LC3-Ⅱ和cleaved caspase-3的表达显著增加(P<0.01),而小鼠体重和P62表达则显著降低(P<0.05,P<0.01)。与I/R组比较,AQP4抑制组和3-MA组的AQP4、LC3-Ⅱ和cleaved caspase-3表达显著降低(P<0.05,P<0.01),而小鼠体重和P62表达则显著增加(P<0.05,P<0.01)。然而,与AQP4抑制组比较,3-MA组小鼠Longa评分、脑梗死体积、小鼠体重和AQP4、LC3-Ⅱ、cleaved caspase-3及P62的表达无显著差异。结论:抑制AQP4的表达能够显著减小tMCAO模型小鼠的脑梗死面积和减轻神经损伤程度。同时,抑制AQP4的表达对脑梗死后自噬和凋亡具有减缓作用,而加用自噬抑制剂后对AQP4抑制剂的保护作用无显著影响。

灌服肠内酯对哺乳羔羊瘤胃发酵参数和消化道发育的影响

本研究旨在探讨灌服肠内酯对羔羊瘤胃发酵和胃肠道发育的影响。试验选取14只健康12日龄湖羊羔羊,随机均分为两组,对照组灌服生理盐水,灌服肠内酯组于每天10:00进行口腔灌服处理,预饲期3 d,正试期为28 d。试验过程中羔羊自由采食1∶9冲泡的山羊奶粉并自由饮水,每天记录羔羊采食量,每周称重,羔羊在42日龄时屠宰采样,采取瘤胃和小肠组织样品,以及瘤胃液样品,分别用于组织形态学和挥发性脂肪酸分析。结果:与对照组相比,口腔灌服肠内酯显著提高了羔羊5周龄平均日增重(P<0.05);口腔灌服肠内酯显著降低了瘤胃内乙酸比例(P=0.019)以及乙酸与丙酸比(P=0.019);口腔灌服肠内酯显著增加了羔羊瘤胃完全分化乳头比例(P=0.013),增加瘤胃壁厚度(P=0.004)、瘤胃乳头长度(P<0.001)、宽度(P<0.001)、密度(P<0.001)和表面积(P<0.001),显著增加角质层厚度(P=0.004)以及棘状层和基底层厚度(P<0.001);口腔灌服肠内酯显著增加了羔羊十二指肠(P<0.001)、空肠绒毛高度(P=0.048)和十二指肠的绒毛高度/隐窝深度(P<0.001),显著降低了十二指肠隐窝深度(P<0.001)。综上,口腔灌服肠内酯能增加羔羊瘤胃壁厚度,显著刺激瘤胃上皮细胞层的增生,促进羔羊瘤胃的发育,增加小肠绒毛高度,提高小肠的吸收能力,为羔羊健康生长发育打下坚实基础。

秩序知觉理论下的当代舞剧视觉焦点探论

艺术创作与审美活动离不开艺术家对规则与秩序建立的探求。预先匹配机制是舞蹈艺术创作建立秩序的重要手段,它揭示了主体在舞蹈审美活动中对视觉焦点选择的内在规律,帮助创作者透过秩序知觉原则筑造符合观者审美心理规律的舞蹈图像。从时空力的拆解与重构、情境配景的虚化与概括、舞台视觉的中断与反差效应等现象剖析舞蹈视觉式样,有助于为当代舞剧视觉焦点的建构提供更丰富的艺术表现方式。

电驱自动变速器换挡系统自锁装置的设计研究

自锁装置对于电驱自动变速器换挡系统的性能起到非常关键的作用。文章通过对换挡系统自锁装置工作时的受力情况建立其动力学理论模型。通过自锁装置挡位保持力的实测值与理论模型计算结果的对比,验证了所建动力学理论模型的准确性。建立某纯电动两挡电驱自动变速器整个换挡系统的Adams仿真模型,并引入自锁装置动力学理论模型。仿真分析结果表明,对于相同挡位保持力,在结构设计允许的范围内,自锁装置拨叉轴凹槽接触角越大、弹簧刚度越小,换挡系统换挡能耗越低。

Approximate Solution for Mechanism of Thermally and Wind-driven Ocean Circulation

The thermally and wind-driven ocean circulation is a complicated natural phenomenon in the atmospheric physics. Hence we need to reduce it using basic models and solve the models using approximate methods. A non-linear model of the thermally and wind-driven ocean circulation is used in this paper. The results show that the zero solution of the linear equation is a stable focus point, which is the path curve trend origin point as time (t) trend to infinity. By using the homotopic mapping perturbation method, the exact solution of the model is obtained. The homotopic mapping perturbation method is an analytic solving method, so the obtained solution can be used for analytic operating sequentially. And then we can also obtain the diversified qualitative and quantitative behaviors for corresponding physical quantities.

Perturbed solution of sea-air oscillator for the El Nino/ La Nina-Southern Oscillation mechanism

A class of coupled system of the E1 Nino/La Nina-Southern Oscillation （ENSO） mechanism is studied. Using the perturbed theory, the asymptotic expansions of the solution for ENSO model are obtained and the asymptotic behavior of solution for corresponding problem is considered.

深化中国国债收益率曲线应用

在管理部门的指导下,中央结算公司于1999年在国内率先编制并发布第一条人民币国债收益率曲线。经过20多年的努力,我国国债市场发展迅速,国债收益率曲线日益成熟,已成为反映我国宏观经济运行状况的“晴雨表”和公认的无风险基准利率,在经济金融运行的多个方面发挥了关键作用。但目前我国短期利率向中长期利率的传导效率,尤其是对信贷市场的传导作用仍然偏弱。对此,本文从提升货币政策传导效率、持续深化国债收益率曲线建设等方面提出政策建议,以促进金融市场高质量发展。

THE SINGULARLY PERTURBED BOUNDARY VALUE PROBLEMS FOR SEMILINEAR ELLIPTIC EQUATION

The singularly perturbed boundary value problems for the semilinear elliptic equation are considered. Under suitable conditions and by using the fixed point theorem, the existence, uniqueness and asymptotic behavior of solution for the boundary value problems are studied.

NLP题库考试系统的设计与实现

随着自然语言处理(Natural Language Processing,NLP)技术的发展,其对各行各业的发展注入了新的动力,同时在网络教育快速发展的背景下,二者的有机融合也便成为热点。本文提出基于浏览器/服务器(Browser/Server,B/S)模式,通过建立录题模板实现对试题的分割和录入,借助Textrank4zh和word2vec模块,建立以TextRank算法为基础的隐马尔可夫模型完成组卷功能,完成以Vue.js框架为前端和Flask框架为后端的题库考试系统的设计与实现。该项目在减轻教师工作量的同时可更好地考察学生知识掌握的程度。

非线性广义分数阶热波方程的渐近解

研究了一类非线性广义热波方程.首先在简化的热波方程情形下求得解,其次用泛函分析同伦映射方法,求出了广义非线性扰动热波方程初始-边值问题任意次的渐近解.并举例求得了其渐近解以及解的精度.最后简述了它的物理意义.并说明了它是近似的解析解,弥补了单纯用数值方法模拟解的不足.

THE SINGULARLY PERTURBED BOUNDARY VALUE PROBLEMS FOR SEMILINEAR ELLIPTIC EQUATION OF HIGHER ORDER

The singularly perturbed boundary value problems for the semilinear elliptic equation of higher order are considered. Under suitable conditions and by using the fixed point theorem the existence, uniqueness and asymptotic behavior of solution for the boundary value problems are studied.

SOLVABILITY FOR NONLINEAR ELLIPTIC EQUATION WITH BOUNDARY PERTURBATION

The solvability of nonlinear elliptic equation with boundary perturbation is consid- ered. The perturbed solution of original problem is obtained and the uniformly valid expansion of solution is proved.

A SINGULARLY PERTURBED PROBLEM FOR STABLE SUPERSONIC FLOW

In this paper,a singularly perturbed problem for the stable fluid flow is considered.As supersonic speed at upper reaches and subsonic speed at lower reaches in a duct,the position of shock layer is analyzed and the asymptotic estimation of solution is obtained.

THE SINGULARLY PERTURBED NONLOCAL BOUNDARY VALUE PROBLEMS FOR HIGHER ORDER NONLINEAR ELLIPTIC EQUATIONS

In this paper,a class of singular perturbation of nonlocal boundary value problems for elliptic partial differential equations of higher order is considered by using the differential inequalities.The uniformly valid asymptotic expansion of solution is obtained.

小鼠原代腹腔巨噬细胞外泌体的分离及鉴定

目的分离纯化小鼠原代腹腔巨噬细胞分泌的外泌体并进行鉴定。方法分别经5只雄性C57BL/6小鼠腹腔注射3%巯基乙酸盐肉汤,灌洗获得小鼠原代腹腔巨噬细胞后,用流式细胞术分析纯度。采用ExoQuick TC外泌体试剂盒提取小鼠原代腹腔巨噬细胞外泌体,BCA试剂盒测定外泌体蛋白含量,透射电镜观察外泌体形态,纳米颗粒跟踪分析仪检测外泌体粒径及分布,Western blot法检测外泌体标志物(CD9、CD63和TSG101)的表达。结果每只小鼠可获得约5×10^(6)个纯度为(99.17±0.65)%的腹腔巨噬细胞。5 mL小鼠原代腹腔巨噬细胞培养上清液中可提取869μg外泌体蛋白。小鼠原代腹腔巨噬细胞外泌体在电镜下呈折光性较强的典型茶托样囊泡,高表达外泌体特异性标志物TSG101、CD63和CD9,粒径分布集中在100~200 nm,平均粒径为175.2 nm。结论腹腔注射巯基乙酸盐肉汤可提高小鼠原代腹腔巨噬细胞得率,ExoQuick TC外泌体试剂盒能够提取足量且纯度较高的小鼠原代腹腔巨噬细胞外泌体。

基于图—底关系的当代舞剧叙事空间建构

借助图—底关系理论透析当代舞剧的叙事空间模式,找寻各层级视觉材料之间的知觉关联,有助于我们从人类的审美心理视角与前意识运用中,探索图案与背景交织共生的多重稳定性,判断其可形成的内在张力。本文通过分析舞剧作品中的知觉中心、图形可逆现象以及图形交叠所汇聚的视觉张力等问题,从现代人审美心理角度探索更具当代语境的舞剧空间叙事形式。