“STEM SOS”模式下的一道试题评讲实践

“STEM SOS”模式下探索让学生在数学课堂“秀起来”的策略与方法,数学在教学实践中要注意“三想”,即让学生想得到、想得妙、想得透,引发学生思维的生长.

A novel digital control strategy of three-phase shunt active power filter under non-ideal mains voltages

A novel control strategy for three-phase shunt active power filter (SAPF) was proposed to improve its performance under non-ideal mains voltages. The approach was inspired by our finding that the classic instantaneous reactive power theory based algorithm was unsatisfactory in terms of isolating positive sequence fundamental active components exactly under non-ideal mains voltages. So, a modified ip-iq reference current calculation method was presented. With usage of the new method, not only the positive sequence but also the fundamental active current components can be accurately isolated from load current. A deadbeat closed-loop control model is built in order to eliminate both delay error and tracking error between reference voltages and compensation voltages under unbalanced and distorted mains voltages. Computer simulation results show that the proposed strategy is effective with better tracking ability and lower total harmonic distortion (THD). The strategy is also applied to a 10 kV substation with a local electrolysis manganese plant injecting a large amount of harmonics into the power system, and is proved to be more practical and efficient.

Human Rights and Jainism A Comparative Study

My research paper tries to investigate certain pertinent questions which are very important for the solution of today＇s problems which we are facing in a globalised world. They are as follows： （1） By following Jain principles, how one can promote and preserve rights of the individual; （2） In what ways Jain teachings prescribed preventive measures against the violation of human rights; （3） Chronology of Indian political thought and Comparison between Jain and Gandhian human rights. Today, we are facing the problems of infringement, misuse of rights in all walks of our life. We are confronting with the problems of social, economic, and political rights, discrimination between men and women in third world countries. Inequality is rampant. To establish equality-protection, promotion, and preservation of human rights is utmost important need of the day. It is one of ways that by following Jain teachings and principles we can be able to establish equality of rights and peace in the contemporary world. So my research paper will be aptly related with the Congress main theme, the politics in the world of inequality. My paper is an interpretative study which is viewed from the socio-political dimension not from the religious or metaphysical point of view.

The practice of project construction and management of Three Gorges ship lock

The double-line five-step ship-lock of Three Gorges Project (TGP) is an extra-large navigation structure with the maximum design total head and single-step delivery head in the world and complicated technical problems.The shiplock is a challenging and world-class project integrating the advanced techniques and equipment,the up-to-date technologies and materials,as well as the advanced project management.Through 17-year construction and 9-year operation of the ship-lock,various difficulties in design,construction,equipment manufacturing and installation as well as system debugging have been overcome effectively.The project management ideas,management system,management methods,technological innovation and team building are summarized according to the management practice of the second stage main work of Three Gorges ship-lock.

Some Subsystems of a Lie Triple System Closely Related to Its Frattini Subsystem

The main purpose of the present paper is to give some properties of the Jacobson radical, the Frattini subsystem and c-ideals of a Lie triple system. Some further results concerning the Frattini subsystems of nilpotent and solvable Lie triple systems are obtained. Moreover, we develop inititally c-ideals for a Lie triple system and make use of them to give some characterizations of a solvable Lie triple system.

Mbius geometry of three-dimensional Wintgen ideal submanifolds in S^5

Wintgen ideal submanifolds in space forms are those ones attaining equality at every point in the socalled DDVV inequality which relates the scalar curvature,the mean curvature and the normal scalar curvature.This property is conformal invariant;hence we study them in the framework of Mbius geometry,and restrict to three-dimensional Wintgen ideal submanifolds in S5.In particular,we give Mbius characterizations for minimal ones among them,which are also known as(3-dimensional)austere submanifolds(in 5-dimensional space forms).

The structure of quadratic groups over commutative rings

Let （R, A） be a commutative form ring. We obtain a complete description of all subgroups of quadratic groups Q2n（R, A） which are normalized by elementary subgroups by form ideals, rather than usual ideals. For the weak sandwich theorem, we give a direct proof without using localization method.

Spectrality of planar self-affine measures with two-element digit set

The iterated function system with two element digit set is the simplest case and the most important case in the study of self affine measures.The one dimensional case corresponds to the Bernoulli convolution whose spectral property is understandable.The higher dimensional analogue is not known,for which two conjectures about the spectrality and the non spectrality remain open.In the present paper,we consider the spectrality and non spectrality of planar self affine measures with two element digit set.We give a method to deal with the two dimensional case,and clarify the spectrality and non spectrality of a class of planar self affine measures.The result here provides some supportive evidence to the two related conjectures.