Harbin, China
Harbin, China

University of Heilongjiang is a national university in the city of Harbin, Heilongjiang Province, People's Republic of China.The university was established in March 1941, in the base of China's communist revolution, Yan'an. It dates back to the Russian Language Group, Number 3 school-level division, Chinese Military and Politics University of the Anti-Japanese invasion , an institute dedicated to the training of military translators. Wikipedia.

Time filter

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Sun S.,Heilongjiang University
IEEE Transactions on Automatic Control | Year: 2013

A novel model is developed to describe possible random delays and losses of measurements transmitted from a sensor to a filter by a group of Bernoulli distributed random variables. Based on the new developed model, an optimal linear filter dependent on the probabilities is presented in the linear minimum variance sense by the innovation analysis approach when packets are not time-stamped. The solution to the optimal linear filter is given in terms of a Riccati difference equation and a Lyapunov difference equation. A sufficient condition for the existence of the steady-state filter is given. At last, the optimal filter is given by Kalman filter when packets are time-stamped. © 1963-2012 IEEE.

Zhou W.,Heilongjiang University | Fu H.,Heilongjiang University
ChemCatChem | Year: 2013

Mesoporous materials are widely used in solar cells, lithium-ion batteries, sensors, and supercapacitors. Mesoporous TiO2 is also highly active in photocatalysis, owing to the benefits of the mesoporous network in promoting the diffusion of the reactants and products, as well as in facilitating access to the reactive sites on the surface of the photocatalysts. This Minireview focuses on the development of mesoporous TiO2, metal/nonmetal-doped mesoporous TiO2 networks, and mesoporous TiO2 composites. The design and synthesis of mesoporous TiO2, including the formation of various mesostructured frameworks, pore-size control, large-pore-size fabrication, and highly thermally stable mesoporous-network formation, are described in detail. From an application viewpoint, the subsequent fabrication of doped and multifunctional heterojunctions in mesoporous TiO2 is necessary for further improving its photocatalytic performance. The doping of mesoporous TiO2 with metals or nonmetals could extend the absorption edge into the visible-light spectrum and improve the separation efficiency of photogenerated electron-hole pairs. The fabrication of mesoporous TiO2 composites, especially heterojunctions, could make full use of the characteristics of each component for improving the overall photocatalytic performance. In view of this fact, mesoporous TiO2 still possesses significant room for development in photocatalysis and is worthy of greater attention in the future. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Sun S.-L.,Heilongjiang University
Zidonghua Xuebao/Acta Automatica Sinica | Year: 2012

This paper is concerned with optimal linear estimation problem for networked systems with random delays and packet dropouts. Two Bernoulli distributed random variables are employed to describe the phenomena of possible one-step random delay and multiple packet dropouts in data transmission by networks. Based on an innovative analysis approach, the optimal linear filter, predictor and smoother for the state are presented in a linear minimum variance sense. They are solved based on a Riccati equation and a Lyapunov equation. A sufficient condition for the existence of the steady-state estimators is given. A simulation example verifies their effectiveness. Copyright © 2012 Acta Automatica Sinica. All rights reserved.

Jing L.,Heilongjiang University | Zhou W.,Heilongjiang University | Tian G.,Heilongjiang University | Fu H.,Heilongjiang University
Chemical Society Reviews | Year: 2013

Due to the increasingly polluted environment and the gradual depletion of fossil fuel reserves, the development of renewable technologies for environmental remediation and energy production is highly desirable. Over the past decades, oxide-based semiconductor photocatalysis has attracted much attention. On various frontiers for efficient photocatalysis, surface-tuning strategies for synthesis and modification of oxides on the nanometer scale have progressed at a fast pace. Hence, it is of significance to review recent advances in the development of surface tuning for oxide-based nanomaterials as activity-enhanced photocatalysts. In this review, special emphases, especially for recent advances in our group, are given to surface tuning of novel nanocrystallites for high thermal stability, hierarchical structure assembly, heterojunctional nanocomposites and high-energy-facet exposure, along with effective testing tools for photogenerated charge properties at the surfaces and/or interfaces. This is of great significance for fields related to energy and environment from scientific and engineering viewpoints. © 2013 The Royal Society of Chemistry.

Li F.,Heilongjiang University | Zhang X.,Heilongjiang University
International Journal of Robust and Nonlinear Control | Year: 2012

This paper is concerned with establishing a delay-dependent bounded real lemma (BRL) for singular linear parameter-varying (LPV) systems with time-variant delay. In terms of linear matrix inequality, a delay-dependent BRL is presented to ensure singular time-delay LPV systems to be admissible and satisfy a prescribed H ∞ performance level. The BRL is obtained based on the construction of a parameter-dependent Lyapunov-Krasovskii functional. The effectiveness of the proposed approach is shown by several numerical examples. © 2011 John Wiley & Sons, Ltd.

Sun S.,Heilongjiang University
International journal of nanomedicine | Year: 2011

Insulin was complexed with sodium deoxycholate to form an insulin-sodium deoxycholate complex (Ins-SD-Comp) using an hydrophobic ion pairing method in aqueous phase to enhance the liposolubility of insulin. In order to obtain the maximal complexation efficiency, the molar ratio of sodium deoxycholate to insulin was found. The zeta potential method was used to confirm the optimal ratio for formation of Ins-SD-Comp. The structural characteristics of Ins-SD-Comp were assessed using the Fourier transform infrared method. The apparent partition coefficient of insulin increased upon the formation of Ins-SD-Comp. Based on the preliminary study, Ins-SD-Comp was encapsulated into poly(lactide-co-glycolide) (PLGA) nanoparticles using an emulsion solvent diffusion method. The maximal encapsulation efficiency of Ins-SD-Comp into PLGA nanoparticles was 93.6% ± 2.81%, drug loading was about 4.8% ± 0.32%, and the mean diameter of the nanoparticles was 278 ± 13 nm. Biological activity and in vivo results revealed that the bioactivity of insulin was not destroyed during the preparation process. Ins-SD-Comp-loaded PLGA nanoparticles have the potential to reduce serum glucose levels and increase the oral bioavailability of insulin.

Sun S.,Heilongjiang University
International Journal of Innovative Computing, Information and Control | Year: 2012

This paper is concerned with the linear optimal full-order estimation problem for networked control systems with multiple packet dropouts of both sides from a sensor to an estimator and from a controller to an actuator. The phenomena of packet dropouts are described by two mutually uncorrelated random variables satisfying Bernoulli distributions. A full-order linear optimal state filter and an input filter in the least mean square sense are designed via completing square approach. They employ the received measurements at the present and last moments. The proposed filters are recursively computed in terms of the solutions of a Riccati equation, a Lyapunov equation and a simple difference equation. Further, the full-order linear optimal predictors and smoothers are also derived for the state and input, respectively. The stability of the proposed linear optimal filters is analyzed and the steady-state property is also investigated. The sufficient conditions for the stability of the linear optimal filters and the existence of the steady-state filters are given, respectively. Two simulation examples show the effectiveness of the proposed estimators. © 2012 ICIC International.

Li P.,Heilongjiang University
Journal of Mathematical Imaging and Vision | Year: 2013

Contour tracking in complex environments is a difficult problem due to the cluttered backgrounds, illumination changes, occlusion and camera viewpoint variations etc. This paper presents a region functional based on the Earth Mover's Distance (EMD), computation of which is mathematically modeled as the transportation problem (TP), for robust contour tracking in the challenging conditions. Formulation of EMD-based functional can be described as variational EMD (VEMD) since the contour curve function is involved for optimization. Minimizing the EMD-based functional is nontrivial and we develop a two-phase method for its optimization. In the first phase, letting the candidate contour be fixed, we seek the best solution to the TP by the Simplex algorithm. Then through the shape derivative theory, we make a perturbation analysis of the contour around the best solution to the TP. As a result we obtain a partial differential equation (PDE) that is solved by the level-set algorithm. The two-phase procedure iterates until the appropriate stopping criterions are satisfied. Alongside the EMD-based functional formulation, we introduce a dimensionality reduction method by tensor decomposition, achieving a low-dimensional Tensor-SIFT features for object representation. Applicable to both the color and gray-level images, Tensor-SIFT features are distinctive, insensitive to illumination and viewpoint changes. Finally, we develop an integrated algorithm that combines various techniques, e.g. the Simplex algorithm, narrow-band level set and fast marching algorithms. Particularly, we provide a method for the level-set initialization between two successive frames and the criterions for stopping the iterative functional optimization. Experiments in challenging image sequences show that the proposed work has promising performance. © 2012 Springer Science+Business Media, LLC.

Heilongjiang University | Date: 2013-06-13

A nanostructure quick-switch memristor includes an upper electrode, a lower electrode and three layers of nanomembrane provided between the upper electrode and the lower electrode. The three layers of nanomembrane consist of an N-type semiconductor layer, a neutral semiconductor layer on the N-type semiconductor layer, and a P-type semiconductor layer on the neutral semiconductor layer. The nanostructure quick-switch memristor of the present invention has the quick switching speed, simple manufacturing method, and low manufacturing cost.

News Article | February 28, 2017
Site: www.prnewswire.co.uk

The Swiss textile technology innovator HeiQ and sustainable outdoor clothing brand Patagonia have teamed up for an exclusive strategic research partnership to explore novel ways for a sustainable textile finishing technology to achieve breathable and durable water repellence (DWR) with best-in-class performances. Recently awarded the Accenture Strategy Award for Circular Economy Multinational among 230 applicants at the World Economic Forum in Davos (Switzerland) in recognition of its accomplishment in reducing waste in its production processes and products, for decades, Patagonia has been leading the industry towards building high-performance products with the vision to a greener and more sustainable future for our environment. A central component to Patagonia's material innovation strategy is to minimize the proliferation of toxic chemistries. Following recent human health and environmental studies quantifying the hazardous impacts of perfluorinated chemistries (PFCs), some brands in the outdoor industry have begun to switch to currently available first-generation non-fluorinated DWRs. Among HeiQ's product portfolio, there are already several industry-leading fluorine-free DWR technologies, including HeiQ's enormously successful HeiQ Eco Dry product. "Shattering the status quo for DWR is of paramount importance to Patagonia. However, we will not be successful unless we also achieve the quality and performance that our customers demand, a calculated partnership is a key means of doing so," said Matt Dwyer, director of material innovation and development at Patagonia. "HeiQ is a natural partner in its ability to conduct world class research while commercializing high performing, sustainable textile finishes and we believe that together we can find a solution." "We carefully choose our brand partners before initiating a cooperative research project," said Colin Lantz, vice president of HeiQ Brandforce. He added, "Patagonia and HeiQ share the same vision that technology can perfect our every-day textile products. This formed the basis for this partnership." The HeiQ research leader for this project is Dr. Murray Height, co-founder and chief technology officer of the HeiQ Group. "At HeiQ we have worked towards non-pfc DWR technology for over five years. This project aims to realize an improved non-pfc DWR technology and achieve a new level of performance in this field," said Dr. Height. HeiQ's current product, HeiQ Eco Dry is among the most effective non-pfc water repellent textile technologies on market, capable of achieving water repellency performance identical to or better than PFC C6 levels. Founded in 2005 as a spin-off from the Swiss Federal Institute of Technology Zurich (ETH), HeiQ is a leader in textile innovation creating some of the most effective, durable and high-performance textile effects in the market today. HeiQ leverages its boundless academic research network and internal development specialists to invent disruptive new technologies that meet consumer needs and outperform the market. Engaging along the entire value chain, HeiQ is the ideal partner to help brands innovate, differentiate their products and capture added value at the point of sale. Founded by Yvon Chouinard in 1973, Patagonia is based in Ventura, California. A certified B-Corporation, Patagonia's mission is to build the best product, cause no unnecessary harm and use business to inspire and implement solutions to the environmental crisis. The company is recognized internationally for its commitment to authentic product quality and environmental activism, contributing over $78 million in grants and in-kind donations to date.

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