Forced Sliding Mode Control for Chaotic Systems Synchronization

Synchronization of chaotic systems is considered to be a common engineering problem. However, the proposed laws of synchronization control do not always provide robustness towards the parametric perturbations. The purpose of this article is to show the use of synergy-cybernetic approach for the construction of robust law for Arneodo chaotic systems synchronization. As the main method of design of robust control, the method of design of control with forced sliding mode of the synergetic control theory is considered. To illustrate the effectiveness of the proposed law it's compared in this article with the classical sliding mode control. The distinctive features of suggested robust control law are the more good compensation of parametric perturbations (better performance indexes --- the root-mean-square error, average absolute value of error) without designing perturbation observers, the ability to exclude the chattering effect, less energy-consuming and a simpler analysis of the stability of a closed-loop system. Offered approach will allow a new consideration for the design of robust control laws for chaotic systems, taking into account the ideas of directed self-organization and robust control. It can be used for synchronization other chaotic systems.Mathematics Subject Classification (2020) 93B35 · 93B52 · 93C30 · 93D21 · 34H10

Research on Design Electrode Channel in Microfluidic Chip

In recent years, microfluidic chips have been widely used in food safety, environment detection, clinical diagnosis and biochemical. However, Digital microfluidic chips(DMF) are attracting more and more eyes because picoliter-microliter-sized sample droplets can be accurately and automatically manipulated. In this paper, a method of design electrode channel height is studied to improve the efficiency of the voltage driving.

Concrete in the Environment of Agricultural Buildings

The construction of biogas plants, clamp silos and buildings for cattle housing is significantly increasing with current agricultural production. During the building of new agricultural structures or the remediation of existing ones, it is necessary to consider the level of resistance of the used concrete that is to be exposed to highly aggressive chemical environments. The objective of the article is to describe a method of design, production and testing of concretes intended for these types of agricultural constructions. Particular attention will be paid to the properties of fresh and hardened concrete and its durability when laid in silage leachates and in conditions of low pH.

Unified Performance-Based Design of RC Dual system

A dual system building is comprised of frames and shear walls. In dual system the shear wall predominantly carries the lateral loads arising out of earthquake or wind. Frame is primarily designed for vertical load along with a fraction of lateral load. The force-based method of design or codal design method can hardly design building for pre-defined target objectives. The alternative method of design is displacement-based design (DBD). Available displacement-based design, like, Direct Displacement-Based design (DDBD) had been applied to dual system. However, DDBD method satisfied only drift criteria and was silent about the performance level. Also, the member sizes had to be obtained through iterations. Unified Performance-Based Design (UPBD) method can accommodate both drift and performance level as target design criteria. In the present study the theoretical background of UPBD method for dual system has been explained and detailed design steps have been highlighted. The method has been validated through several dual system buildings with different target design criteria. Dual system buildings have been designed using UPBD method for target objectives of (i) Immediate Occupancy performance level (PL) with drift 1%, (ii) life Safety PL with drift 2% and, (iii) Collapse Prevention PL with drift 3%. The nonlinear evaluation of the designed buildings shows that in all the cases the target design criteria have been fulfilled. The UPBD method of dual system also gives the member sizes in the beginning of the design and thus avoids iteration in design.

The material architect: physically engaging the design process

The contemporary architect operates within a profession which is detached from the physical processes undertaken during the making of architecture. The emergence of two-dimensional representation as the architect’s primary mode of communication and design is deeply embedded within architectural praxis. The fundamental physical reality of architecture requires that the architect have an experientially based understanding of architecture’s conceptual drivers. This situation necessitates re-conceptualizing the process of creating architecture. By reverting to a tangibly based method of design the creation of representative and demonstrative artefacts can aid in developing a stimulating and exploratory design process. The proposed method of design imbues the designer with a direct corporal experience of architectural ideas heightening an awareness of existent and emergent complexities in manifesting architectural works. The maturation of an architectural intuition steeped in the material reality of architecture developed through the fabrication of architectural prototypes is a critical tool in the arsenal of the contemporary architect.

The material architect: physically engaging the design process

The contemporary architect operates within a profession which is detached from the physical processes undertaken during the making of architecture. The emergence of two-dimensional representation as the architect’s primary mode of communication and design is deeply embedded within architectural praxis. The fundamental physical reality of architecture requires that the architect have an experientially based understanding of architecture’s conceptual drivers. This situation necessitates re-conceptualizing the process of creating architecture. By reverting to a tangibly based method of design the creation of representative and demonstrative artefacts can aid in developing a stimulating and exploratory design process. The proposed method of design imbues the designer with a direct corporal experience of architectural ideas heightening an awareness of existent and emergent complexities in manifesting architectural works. The maturation of an architectural intuition steeped in the material reality of architecture developed through the fabrication of architectural prototypes is a critical tool in the arsenal of the contemporary architect.