A constructive approach to minimal realization problem of 2D systems

Unlike in the 1D case, it is not always possible to find a minimal state-space realization for a 2D system except for some particular categories. The purpose of this paper is to explore a constructive approach to the minimal Roesser model realization problem for a class of 2D systems which does not belong to the clarified categories. As one of the main results, a constructive realization procedure is first proposed. Based on the proposed procedure, sufficient conditions and explicit construction for minimal realizations of the considered 2D systems are shown. In addition, possible variations and applications of the obtained results are discussed and illustrative examples are presented.

MY R&.D WORK IN THE FIELD OF HF RADAR SYSTEMS

Since 1958. I bave been doing research and teaching work at Harbin Polytechnic on the theories of radar,navigational guidance,and signal processing & information treatment by developing new radar systems. In 1979, I went to England in the status of an honorary research fellow and stayed there for two years.probing into HF radar systems under the guidance of the world-famous British marine telemetrist Professor Shearman at Birmingham University.Here.I briefly

Families of magnetic semiconductors——an overview

The interplay of magnetic and semiconducting properties has been in the focus for more than a half of the century. In this introductory article we briefly review the key properties and functionalities of various magnetic semiconductor families, including europium chalcogenides, chromium spinels, dilute magnetic semiconductors, dilute ferromagnetic semiconductors and insulators, mentioning also sources of non-uniformities in the magnetization distribution, accounting for an apparent high Curie temperature ferromagnetism in many systems. Our survey is carried out from today's perspective of ferromagnetic and antiferromagnetic spintronics as well as of the emerging fields of magnetic topological materials and atomically thin 2D layers.

Design of Discrete-time Repetitive Control System Based on Two-dimensional Model

This paper presents a novel design method for discrete-time repetitive control systems （RCS） based on two-dimensional （2D） discrete-time model. Firstly, the 2D model of an RCS is established by considering both the control action and the learning action in RCS. Then, through constructing a 2D state feedback controller, the design problem of the RCS is converted to the design problem of a 2D system. Then, using 2D system theory and linear matrix inequality （LMI） method, stability criterion is derived for the system without and with uncertainties, respectively. Parameters of the system can be determined by solving the LMI of the stability criterion. Finally, numerical simulations validate the effectiveness of the proposed method.

Electron Spin Resonance(ESR)Spectroscopy of the Transition-metal Complexes and Clusters I.Systematic Investigations of Real-and Complex-Orbital Methods for Calculating the d-Orbital Energies of a Low-spin(S=1/2)nd^5(t_2~5,~2T_2)(n=3

On the basis of the first paper’s theoretical derivations and concrete instance calculations of the energies of the d orbitals for a low spin ( S =1/2) nd 5(t 2 5, 2T 2)(n =3, 4, 5) system, the major results reported in this paper contain the following two respects: explicit relationships between the coefficients of the real and complex Kramers doublets have been derived by using two types of the expressions of the principal components of the g tensors in real and complex orbital representations obtained in the first paper; the use of these relationships of the real and complex orbital coefficients has carried out a series of mathematical demonstrations on the agreement of the real and complex orbital methods .

3D （Three-Dimensional） Caco-2 Spheroids： Optimized in vitro Protocols to Favor Their Differentiation Process and to Analyze Their Cell Growth Behavior

3D （Three-dimensional） Caco-2 spheroids closely recapitulating in vivo physiological organization of intestinal epithelial cells, provide an excellent in vitro model system to study their pathophysiology and their response to stressful stimuli. The objective of this technical note is to provide optimized in vitro experimental protocols for culturing 3D Caco-2 spheroids and for analyzing their cell growth features. An optimized 3D Caco-2 spheroid culturing technique based on a new configuration of the culture medium is provided A methodological approach to determine the distribution of the cell cycle phases in disaggregated Caco-2 spheroids by using cytofluorimetric analysis is also described. The optimized culturing protocol favors 3D Caco-2 spheroid differentiation process, as evaluated by the number of well-differentiated spheroids with a single hollow lumen. The cytofluorimetric analysis allows rapid collection of cell cycle phase data from high numbers of spheroid samples, thus, permitting to estimate their growth dynamics in a relatively short time. The optimized technical approaches described here can be applied in systematic manner to a variety of research activities utilizing 3D Caco-2 spheroids. Ease of use, time and economic saving advantages deriving from these protocols further highlight their potential.

Improved 2-D Stability Margin Test for 2-D Discrete Systems

An improved 2 D stability margin test and its algorithm for 2 D discrete systems are proposed.The stability margin test procedure can be slmplified by using the inner term polynomials of B(z 1,z 2) to construct a margin test table.Different from other well known 2 D stability margin test algorithms,the new approach can directly obtain the stability margin.

Structure search of two-dimensional systems using CALYPSO methodology

The dimensionality of structures allows materials to be classified into zero-, one-, two-, and threedimensional systems. Two-dimensional (2D) systems have attracted a great deal of attention andtypically include surfaces, interfaces, and layered materials. Due to their varied properties, 2D systemshold promise for applications such as electronics, optoelectronics, magnetronics, and valleytronics.The design of 2D systems is an area of intensive research because of the rapid development of abinitio structure-searching methods. In this paper, we highlight recent research progress on acceleratingthe design of 2D systems using the CALYPSO methodology. Challenges and perspectives for futuredevelopments in 2D structure prediction methods are also presented.

Electron-plasmon interaction induced plasmonic-polaron band replication in epitaxial perovskite SrIrO_(3) films

Electron-boson interaction is fundamental to a thorough understanding of various exotic properties emerging in many-body physics. In photoemission spectroscopy, photoelectron emission due to photon absorption would trigger diverse collective excitations in solids, including the emergence of phonons,magnons, electron-hole pairs, and plasmons, which naturally provides a reliable pathway to study electron-boson couplings. While fingerprints of electron–phonon/-magnon interactions in this state-ofthe-art technique have been well investigated, much less is known about electron-plasmon coupling,and direct observation of the band renormalization solely due to electron-plasmon interactions is extremely challenging. Here by utilizing integrated oxide molecular-beam epitaxy and angle-resolved photoemission spectroscopy, we discover the long sought-after pure electron-plasmon couplinginduced low-lying plasmonic-polaron replica bands in epitaxial semimetallic SrIrO_(3) films, in which the characteristic low carrier concentration and narrow bandwidth combine to provide a unique platform where the electron-plasmon interaction can be investigated kinematically in photoemission spectroscopy. This finding enriches the forms of electron band normalization on collective modes in solids and demonstrates that, to obtain a complete understanding of the quasiparticle dynamics in 5 d electron systems, the electron-plasmon interaction should be considered on equal footing with the acknowledged electron–electron interaction and spin–orbit coupling.

Changes in phospholipase D activity of leukocytes during human systemic inflammatory response syndrome induced by cardiopulmonary bypass

Objective To investigate the fluctuations in arterial leukocyte phospholipase D (PLD) activity during the perioperative period of open heart surgery under cardiopulmonary bypass ( CPB), and the relationship between PLD activity and systemic inflammatory response induced by CPB.Methods Arterial blood was obtained from 26 patients undergoing open heart surgery at 8 different time points during the perioperative period, from which leukocytes were isolated for determination of PLD activity, CD11b expression and myeloperoxidase (MPO) activity. Plasma IL-6, IL-8 and C-reactive protein were also determined. The 26 cases were retrospectively divided into 3 groups according to perfusion time in order to detect the possible influences of CPB on PLD activity and IL-6 and IL-8 levels.Results When the ascending aorta was declamped, average arterial leukocyte PLD activity was 0. 305±0.132 nmol choline·min-1·mg-1, 5. 0 times higher of the pre-CPB value, and remained (5. 4 times higher of the pre-CPB level) at 72 hours after CPB. Leukocyte CD11 b expression and plasma IL-6 and IL-8 levels increased significantly at the end of CPB, while MPO activity and C-reactive protein concentration reached their peaks at 1 and 24 hours, respectively, after CPB. At the end of CPB, the arterial leukocyte PLD activity of patients whose CPB duration was longer than 90 minutes were 1. 82- and 1. 74-fold that of the other two groups with CPB lasting between 90 and 60 minutes and less than 60 minutes.Conclusions Arterial leukocyte PLD activity rises significantly in CPB and its elevation is earlier and more persistent than other inflammation-related indicators tested; longer CPB duration leads to higher leukocyte PLD activity at the end of CPB. These results imply that PLD could be a new target for prevention of systemic inflammatory response induced by CPB.