Changchun University of Science and Technology
Changchun, China

Changchun University of Science and Technology is a provincial key university, previously known as Changchun Institute of Optics and Fine Mechanics . The university was founded in 1958 in Changchun, Jilin, China.After half a century’s development and construction, Changchun University of Science and Technology has been developed into a multidisciplinary university with opto-electronic technology as its outstanding feature and with the integration of optics, mechanics, electronics, computer science as well as material science as its superiority.Following the educational philosophy of ‘Focusing on Cultivation, Advocating Science’ and the university motto of ‘Virtuous, Learned, truthful, Innovative’, the university is endeavoring to reach the goal of ‘provincially top, nationally advanced, and internationally well-known’.Changchun University of Science and Technology has accepted nearly 1000 international students since 1987. The international students mostly come from over 30 countries such as the United States, Russia, Britain, Canada, Norway, Korea, Sudan, Mongolia, DPRK, Vietnam, Japan, Mali, Kenya and Micronesia. Wikipedia.

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Zhao H.,Changchun University of Science and Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

A new laser illumination system was designed based on the analysis of regular homogenization technology. It was widely used in the field of security without sunlight and other lighting. The new laser illumination system used eccentric motor to drive a light shaping scatterer to vibrate at a frequency that faster than the electronic shutter of cameras, making multiple light superimposed in integration time to form a uniform illumination effect. The laser illumination system can eliminate interference fringes and laser speckles, and realize the purpose of homogenization illumination. Experimental results show that the new laser illumination system makes the energy efficiency reach up to 90% and the illumination uniformity reach up to 94% in the effective area. The new laser illumination system improves the uniformity of illumination and utilization rate of laser energy, thus improves the image quality of the illuminated target. © 2016 SPIE.

Zhao H.-F.,Changchun University of Science and Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2017

In order to collect a wide angle range light to receive the collimating beam of a small divergence angle, a highly efficient, compact, TIR collimating system has been designed and optimized. The collimating system adopts a hybrid structure with TIR style. First, calculate the initial structure of the collimating system according to Snell's law and equal focal length principle. Then optimize the initial structure using Lighttools optical design software. Finally, the best LED collimating system has been successfully designed. According to the results of the design, the semi-diameter of the TIR collimating system is 20mm, the diameter is 25mm. The collimating angle is 1.5°. With the light absorption loss of the material and reflection loss of the interface have already been fully considered, the light energy utilization rate is as high as 89.5%. The initial structure of TIR-type LED collimator is designed by Snell's law and equal focal length principle, and then it is optimized by the Lighttools optical design software, so that light energy utilization ratio and uniformity of illumination in the target surface are improved. In addition, TIR-type collimating system, which is small and easy to use, not only has a high light energy utilization ratio but also a compact structure. © 2017 SPIE.

Zhang Y.,Changchun University of Science and Technology
Journal of Materials Science: Materials in Electronics | Year: 2017

Nanostructured ZnS/hyperbranched poly(aryl ether ketone) (ZnS/HPAEK) hybrid material was synthesized by a facile hydrothermal reaction of HPAEK–Zn(Ac)2⋅2H2O in DMF. ZnS nanoparticles were prepared by heterogeneous stirring of carboxylic-functionalized hyperbranched poly(aryl ether ketone) (PCA-HPAEK)–Zn(Ac)2⋅2H2O in DMF with DMF solution of thiourea. The obtained nanocomposites were characterized using various techniques such as Fourier transform infrared spectroscopy (FTIR), high-resolution transmission electron microscopy (HRTEM), UV–Vis spectroscopy and photoluminescence. FTIR and HRTEM studies confirmed the formation of ZnS QDs with small particle size. And the results of photoluminescence measurement showed that the nanocomposites exhibited distinct luminescence properties. Differential scanning calorimetry and thermogravimetric analysis studies indicated that the nanocomposites exhibited excellent heat resistance. In general, a new ZnS/PCA-HPAEK nanohybrid was synthesized without ligand exchange, and had good optical properties and excellent heat resistance. © 2017 Springer Science+Business Media New York

Zhang W.,Changchun University of Science and Technology
Journal of Applied Optics | Year: 2017

In order to improve target detection ability of IR images in long range effectively, an infrared telephoto objective for 8 μm~12 μm wave-band is designed for 640 pixel×512 pixel infrared CCD detector. Effects of surrounding environmental temperature are analyzed and refractive diffractive hybrid thermal compensation is discussed. Focal length of the system is 200 mm, relative aperture is 1:2.2 and field of view is 7°. Infrared telephoto system with small volume and compact structure is designed in a large range of temperature. The system is composed of four lenses with only three materials of zinc sulfide, zinc selenide and germanium to compensate for the temperature. Image quality of the system is evaluated by ZEMAX optical design software. Results show that modulation transfer function (MTF) for each field of view at cut-off frequency of 17 lp/mm is greater than 0.4 which approaches diffraction limit. Root mean square radius of spot diagram for each field of view is close to Airy disk radius. Telephoto objective has favorable performance at working temperature of -40 ℃~+60 ℃. The system meets the requirements of technical specification. © 2017, Editorial Board, Journal of Applied Optics. All right reserved.

Zhai Q.-Z.,Changchun University of Science and Technology
Journal of Chemical and Pharmaceutical Research | Year: 2014

Solid phase method was used to synthesize α-Al2O3 using ammonium sulfate as raw material. Powder X-ray diffraction and scanning electron microscopy were used to characterize the product. The synthesized material was used as adsorbent to investigate the effects of acidity, adsorption time, initial concentration of Hg2+, adsorbent dosage and adsorption temperature on the adsorption of Hg2+. The adsorptive results showed that the optimal adsorption conditions are:for the initial Hg2+ concentration of 0.80 mg/ml, α-Al2O3 amount:Hg2+ amount (g/g) = 4.17, pH = 3.5, contact time 10 min, temperature 20℃C. The maximum adsorptive amount of Hg2+ was 157.8 mg Hg2+ /g (α-Al2O3). The effects of desorption of three type desorptive agents HAc, HNO3, HCl, were probed. The results indicated that the optimal desorption agent is 0.10 mol/L HCl. When desorption was 10 min, the highest desorption rate could reach 97.92%. © 2014, Journal of Chemical and Pharmaceutical Research. All rights reserved.

Chen C.,Changchun University of Science and Technology | Yang H.,Changchun University of Science and Technology
Optics Express | Year: 2016

The changes in the radial content of orbital-angular-momentum (OAM) photonic states described by Laguerre-Gaussian (LG) modes with a radial index of zero, suffering from turbulence-induced distortions, are explored by numerical simulations. For a single-photon field with a given LG mode propagating through weak-to-strong atmospheric turbulence, both the average LG and OAM mode densities are dependent only on two nondimensional parameters, i.e., the Fresnel ratio and coherence-width-to-beam-radius (CWBR) ratio. It is found that atmospheric turbulence causes the radially-adjacent-mode mixing, besides the azimuthally-adjacent-mode mixing, in the propagated photonic states; the former is relatively slighter than the latter. With the same Fresnel ratio, the probabilities that a photon can be found in the zero-index radial mode of intended OAM states in terms of the relative turbulence strength behave very similarly; a smaller Fresnel ratio leads to a slower decrease in the probabilities as the relative turbulence strength increases. A photon can be found in various radial modes with approximately equal probability when the relative turbulence strength turns great enough. The use of a single-mode fiber in OAM measurements can result in photon loss and hence alter the observed transition probability between various OAM states. The bit error probability in OAM-based free-space optical communication systems that transmit photonic modes belonging to the same orthogonal LG basis may depend on what digit is sent. © 2016 Optical Society of America.

Yong K.-T.,Nanyang Technological University | Law W.-C.,State University of New York at Buffalo | Hu R.,Nanyang Technological University | Ye L.,Chinese PLA General Hospital | And 4 more authors.
Chemical Society Reviews | Year: 2013

Tremendous research efforts have been devoted to fabricating high quality quantum dots (QDs) for applications in biology and medicine. Much of this research was pursued with an ultimate goal of using QDs in clinical applications. However, a great deal of concern has been voiced about the potential hazards of QDs due to their heavy-metal content. Many studies have demonstrated toxicity of various QDs in cell culture studies. However, in a smaller number of studies using small animal models (mice and rats), no abnormal behaviour or tissue damage was noticed over periods of months after the systemic administration of QDs. Nevertheless, the correlation of these results with the potential for negative effects of QD on humans remains unclear. Many urgent questions must be answered before the QDs community moves into the clinical research phase. This review provides an overview of the toxicity assessment of QDs, ranging from cell culture studies to animal models and discusses their findings. Guidelines for using various nonhuman primate models for QD toxicity studies are highlighted. This review article is intended to promote the awareness of current developments of QD applications in biology, the potential toxicity of QDs, and approaches to minimizing toxicity. © 2013 The Royal Society of Chemistry.

Chen C.,Changchun University of Science and Technology | Yang H.,Changchun University of Science and Technology
Optics Letters | Year: 2013

The temporal spectrum of beam wander is formulated by considering a Gaussian Schell-model beam passing through atmospheric turbulence with a finite outer scale. Two simpler asymptotic formulas for the temporal spectrum of beam wander within the high- and low-frequency ranges are derived, respectively. Based on the formulations, the effects of the initial partial coherence of the beam, finite outer scale of turbulence, initial beam radius, and initial phase front radius of curvature on the temporal spectrum of beam wander are analyzed by numerical examples. © 2013 Optical Society of America.

Xue C.,Changchun University of Science and Technology | Cui Q.,Changchun University of Science and Technology
Optics Letters | Year: 2010

What we believe to be a new method for designing multilayer diffractive optical elements (MLDOEs) for wideband with consideration of polychromatic integral diffraction efficiency (PIDE) is presented. The benefit of this method is that the maximum PIDE over the entire waveband for MLDOEs can be obtained. The design process and simulation of the MLDOEs with regard to an example for visible waveband are described, and the comparison of diffraction efficiencies of the MLDOEs for different choices of design wavelengths with different methods is given. © 2010 Optical Society of America.

Zhai Q.-Z.,Changchun University of Science and Technology
Journal of Microencapsulation | Year: 2013

This article used MCM-41 as a carrier for the assembly of propranolol hydrochloride by the impregnation method. By means of chemical analysis, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy and low-temperature N2 adsorption-desorption at 77 K, the characterization was made for the prepared materials. The propranolol hydrochloride guest assembly capacity was 316.20 ± 0.31 mg/g (drug/MCM-41). Powder XRD test results indicated that during the process of incorporation, the frameworks of the MCM-41 were not destroyed and the crystalline degrees of the host-guest nanocomposite materials prepared still remained highly ordered. Characterization by SEM and TEM showed that the composite material presented spherical particle and the average particle size of composite material was 186 nm. FT-IR spectra showed that the MCM-41 framework existed well in the (MCM-41)-propranolol hydrochloride composite. Low-temperature nitrogen adsorption-desorption results at 77 K showed that the guest partially occupied the channels of the molecular sieves. Results of the release of the prepared composite drug in simulated body fluid indicated that the drug can release up to 32 h and its maximum released amount was 99.20 ± 0.11%. In the simulated gastric juice release pattern of drug, the maximum time for the drug release was discovered to be 6 h and the maximum cumulative released amount of propranolol hydrochloride was 45.13 ± 0.23%. The drug sustained-release time was 10 h in simulated intestinal fluid and the maximum cumulative released amount was 62.05 ± 0.13%. The prepared MCM-41 is a well-controlled drug delivery carrier. © 2013 Informa UK Ltd All rights reserved.

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