形成函数在溶液平衡研究中的应用

本文从广义上对形成函数进行了定义,并深入研究了它在溶液平衡中的应用。

酸形成函数及用酸形成函数表示的理论缓冲系数公式

本文在讨论各类酸的酸形成函数基础之上,推导出用用酸形成函数表示的理论缓冲系数公式,即:σ=2.30=(sum∑from i=1 to n i(i-■)β_1[H])/(1+sum∑ from i=1 to n β_1[H]~i)式中σ即理论缓冲系数,β_i为各级酸累积形成常数,■即酸形成函数,即:■=(sum ∑ from i=1 to n iβ_i[H]~i)/(1+sum ∑ from i=1 to n β_1[H]~i)应用计算机绘制■-pH 图及σ-pH 图,根据图形讨论了若干典型的缓冲体系。

人工智能如何获得知识？

人构造概念以认识世界,人的认知与人的身体密切相关。计算机是人类心灵的延伸;而人类发明的各种认知用仪器(机器)是人类感官的延伸,它们是数据形成函数。因此,我们可以将人类的概念嵌入到计算机之中让它概念化世界,同时连接人造的感知系统以数据化世界,从而实现人工智能。这样的人工智能是拟人类的或者准人类的,它们能够“像”人那样获得外部世界的知识。由于嵌入进计算机的概念是人类的,人造感知系统即数据形成函数也是基于人类的科学理论的,这样的人工智能所获得的知识也是人能够理解的。

Back analysis for soil slope based on measuring inclination data

Based on the analysis of several objective functions,a new method was proposed.Firstly,the feature of the inclination curve was analyzed.On this basis,the soil could be divided into several blocks with different displacements and deformations.Then,the method of the soil division was presented,and the characteristic of single soil block was studied.The displacement of the block had two components:sliding and deformation.Moreover,a new objective function was constructed according to the deformation of the soil block.Finally,the sensitivities of the objective functions by traditional method and the new method were calculated,respectively.The result shows that the new objective function is more sensitive to mechanical parameters and the inversion result is close to that obtained by the large direct shear apparatus.So,this method can be used in slope back analysis and its effectiveness is proved.

Using texture synthesis in fractal pattern design

Traditional fractal pattern design has some disadvantages such as inability to effectively reflect the characteristics of real scenery and texture. We propose a novel pattern design technique combining fractal geometry and image texture synthesis to solve these problems. We have improved Wei and Levoy (2000)’s texture synthesis algorithm by first using two-dimensional autocorrelation function to analyze the structure and distribution of textures, and then determining the size of L neighborhood. Several special fractal sets were adopted and HSL (Hue, Saturation, and Light) color space was chosen. The fractal structure was used to manipulate the texture synthesis in HSL color space where the pattern’s color can be adjusted conveniently. Experiments showed that patterns with different styles and different color characteristics can be more efficiently generated using the new technique.

Research on Uniform Array Beamforming Based on Support Vector Regression

An approach was proposed for optimizing beamforming that was based on Support Vector Regression (SVR). After studying the mathematical principal of the SVR algorithm and its primal cost function, the modified cost function was first applied to uniform array beamforming, and then the corresponding parameters of the beamforming were optimized. The framework of SVR uniform array beamforming was then established. Simulation results show that SVR beamforming can not only approximate the performance of conventional beamforming in the area without noise and with small data sets, but also improve the generalization ability and reduce the computation burden. Also, the side lobe level of both linear and circular arrays by the SVR algorithm is improved sharply through comparison with the conventional one. SVR beamforming is superior to the conventional method in both linear and circular arrays, under single source or double non-coherent sources.

Robust Control of Time Delay Systems

This study presents the design of both H∞ Loop Shaping Control （HLSC） and Internal Model Control （IMC） strategies for linear time delay systems. For first order time delay system, a systematic approach for weight selection based on the sensitivity function was proposed, then compared to the internal model control strategy. For both methods, the synthesis was based on the Pade approximation. Two cases are considered for time delay： upper or lower than system time constant. Simulation results for the proposed approaches are acceptable ever in presence of disturbances and model mismatches.

各种规模集成电路

本文考虑了非均匀线路的连续线路定尺寸的优化问题。其目的在于发现具有极小化延迟的线路的形成函数。指出了 Elmore 延迟模型的局限性。提出了使用能够非常精确地估计实际延迟的传输线模型。介绍的算法非常有效。试验证明。

ON THE FUNDAMENTAL GROUP OF OPEN MANIFOLDS WITH NONNEGATIVE RICCI CURVATURE

The authors establish some uniform estimates for the distance to halfway points of minimalgeodesics in terms of the distantce to end points on some types of Riemannian manifolds, andthen prove some theorems about the finite generation of fundamental group of Riemannianmanifold with nonnegative Ricci curvature, which support the famous Milnor conjecture.

A conjectural formula for genus one Gromov-Witten invariants of some local Calabi-Yau n-folds

We conjecture a formula for the generating function of genus one Gromov-Witten invariants of the local Calabi-Yau manifolds which are the total spaces of splitting bundles over projective spaces. We prove this conjecture in several special cases, and assuming the validity of our conjecture we check the integrality of genus one Bogomol'nyi-Prasad-Sommerfield(BPS) numbers of local Calabi-Yau 5-folds defined by Klemm and Pandharipande.

Local structure of Co_(55)Ta_(10)B_(35) amorphous alloy investigated by ab-initio molecular dynamics

Ab-initio molecular dynamics simulation was performed to investigate the local atomic structure of Co55Ta^0B35 alloys. Pair distribution function, coordination number, HA index and Voronoi polyhedra were used to describe the detailed local structure of this alloy. It was revealed Co7TalB2, Co6TalB2 and CosTa2B4 among the dominant （0 3 6 0）, （0 4 4 0）, （0 1 10 2） and （0 3 6 4） polyhedra were the basic local structure units in CossTal0B3s amorphous alloy. Furthermore, most of the dominant poly- hedra tended to have Ta atoms involved and these polyhedra may have a critical role during glass formation.