Time filter

Source Type

Harbin, China

Harbin Normal University is a university located in Harbin, Heilongjiang, P.R. China.HNU has 16 colleges and offers 46 academic majors. It offers undergraduate, graduate, and doctorate degrees. It has an international college which has enrolled students from over 20 countries.Daejin University, a South Korean private university, operates one of its two China campuses on the university grounds, with the other campus located at Soochow University in Suzhou. Daejin maintains its own building with accommodation and classrooms. Wikipedia.

Deng C.,Harbin Normal University | Zhang S.,Harbin Engineering University
ACS Applied Materials and Interfaces | Year: 2014

Tailoring materials into nanostructure offers unprecedented opportunities in the utilization of their functional properties. High-purity Na 7V4(P2O7)4(PO 4) with 1D nanostructure is prepared as a cathode material for rechargeable Na-ion batteries. An efficient synthetic approach is developed by carefully controlling the crystal growth in the molten sodium phosphate. Based on the XRD, XPS, TG, and morphological characterization, a molten-salt assisted mechanism for nanoarchitecture formation is revealed. The prepared Na 7V4(P2O7)4(PO 4) nanorod has rectangle sides and preferential [001] growth orientation. GITT evaluation indicates that the sodium de/intercalation of Na7V4(P2O7)4(PO 4) nanorod involves V3+/V4+ redox reaction and Na5V3.5+ 4(P2O7) 4(PO4) as intermediate phase, which results in two pairs of potential plateaus at the equilibrium potentials of 3.8713 V (V 3+/V3.5+) and 3.8879 V (V3.5+/V4+), respectively. The unique nanoarchitecture of the phase-pure Na7V 4(P2O7)4(PO4) facilitates its reversible sodium de/intercalation, which is beneficial to the high-rate capability and the cycling stability. The Na7V4(P 2O7)4(PO4) cathode delivers 80% of the capacity (obtained at C/20) at the 10 C rate and 95% of the initial capacity after 200 cycles. Therefore, it is feasible to design and fabricate an advanced rechargeable sodium-ion battery by employment of 1D nanostructured Na 7V4(P2O7)4(PO 4) as the cathode material. © 2014 American Chemical Society.

Zhang G.,Harbin Normal University
Chinese Geographical Science | Year: 2010

In the Sanjiang Plain, Northeast China, the natural wetland is undergoing a rapid conversion into agricultural land, which has resulted in drastic ecological changes in the region. To investigate the effects of different land uses on soil labile organic carbon, soils of Calamagrostis angustifolia wetland, Carex lasiocarpa wetland, dry farmland, paddy field, forest land and abandoned cultivated land were collected for measuring the contents of soil microbial biomass carbon (MBC), dissolved organic carbon (DOC), readily oxidizable carbon (ROC) and carbohydrate carbon (CHC). The results show that soil organic carbon contents follow the order: Carex lasiocarpa wetland>Calamagrostis angustifolia wetland>forest land>paddy field>dry farmland. The contents of MBC and DOC in Calamagrostis angustifolia and Carex lasiocarpa wetlands are significantly higher than those in other land use types. The contents of CHC and ROC are the highest in Calamagrostis angustifolia wetland and the lowest in dry farmland. The contents of all the labile organic carbon increase along with the years of abandonment of cultivated land. The ratios of MBC, DOC and ROC to SOC also follow the order: Carex lasiocarpa wetland>Calamagrostis angustifolia wetland>forest land>paddy field>dry farmland, while the ratio of CHC to SOC is paddy field>forest field>Carex lasiocarpa wetland>Carer lasiocarpa wetland>dry farmland. When natural wetlands were cultivated, the activity of soil organic carbon tends to reduce in some extent due to the disappearance of heterotrophic environment and the reduction of vegetation residue. Thus, the abandonment of cultivated land is an effective way for restoring soil organic carbon. © Science Press and Northeast Institute of Geography and Agroecology,.

Gai S.,Harbin Engineering University | Qu F.,Harbin Normal University | Yang P.,Harbin Engineering University
ACS Applied Materials and Interfaces | Year: 2013

A novel bifunctional (fluorescent, mesoporous) hollow sphere was prepared by coating luminescent YBO3:Eu3+ nanoparticles onto uniform hollow mesoporous silica spheres (HMSs), derived from an etching strategy using spherical Fe3O4 as templates. The composites exhibit typical mesoporous shells, large interior space, high surface area, and well dispersed nanospheres with controlled size. In addition, the textural properties including the specific surface and pore volume can be easily altered by simply tuning of the spherical Fe3O4 cores. Upon ultraviolet (UV) excitation, the composite shows the characteristic 5D0-7F1-4 red emission lines of Eu3+ even after loading of the model drug. The composite with a large surface area and cavity was used as the host for loading the anticancer drug doxorubicin hydrochloride (DOX). It is observed that the multifunctional composites exhibit an obvious sustained release property and released in texture- and pH-sensitive patterns. Particularly, the down-conversion (DC) fluorescence intensity of the bifunctional vehicle increases with the release of drug molecules, making it possible to track the position and the drug release amount of the drug carrier system and to detect them by the change of fluorescence intensity. © 2013 American Chemical Society.

Xiao N.-N.,Harbin Normal University
Biomolecules and Therapeutics | Year: 2015

The purpose of the present study was to investigate the effects of resveratrol supplementation on oxidative damage and lipid peroxidation induced by strenuous exercise in rats. The rats were randomly divided into five groups: a sedentary control group, an exercise control group, and three treatment exercise groups administered increasing doses of resveratrol (25, 50, and 100 mg/kg body weight). Resveratrol was administered by oral gavage once daily for four weeks. At the end of the four-week period, the rats performed a strenuous exercise on the treadmill, and the levels of lactate dehydrogenase (LDH), creatine kinase (CK), malondialdehyde (MDA), 4-hydroxy-2-nonenal (4-HNE), and 8-hydroxy-2'-deoxyguanosine (8-OHdG) were measured. The results showed that resveratrol supplementation had protective effects against strenuous exercise-induced oxidative damage and lipid peroxidation by lowering the levels of LDH, CK, MDA, 4-HNE, and 8-OHdG in the serum or muscle of rats. These beneficial effects are probably owing to the inherent antioxidant activities of resveratrol. © 2015 The Korean Society of Applied Pharmacology.

Gao J.F.,Harbin Normal University
International Journal of Computer Mathematics | Year: 2011

In this paper, we will study oscillations of numerical solutions for the neutral delay differential equation d/dt[y(t) + py(t - τ)] + qy(t + σ) = 0, where p ∈ ℝ and p ≠ 0, τ, q ∈ (0,+∞), σ ≥ 0. Conditions under which numerical solutions of the above differential equation are oscillatory are obtained. The condition that leads to oscillations of the linear θ-method is also given. To verify our results, we give numerical experiments. © 2011 Taylor & Francis.

Discover hidden collaborations