高等院校作为人工智能人才培养的高地将为我国的人工智能产业发展提供创新体系与学科体系.本文通过对《高等学校人工智能创新行动计划》等相关改革文件的分析,讨论在该计划框架下师范院校开展人工智能与编程教师培养的建议和策略,并认为师范院校开展相关人才培养,可以从三个方面着手:高校学生一是依托人工智能技术,进行相关教学实践;二是面向中小学人工智能教师进行相关课程设置;三是面向全体高校学生进行人工智能基础课程设置.

在人工智能技术背景下,STEAM教育作为创新性人才培养有效的途径成为国内外科技创新教育研究的热点,STEAM课程体系开发有五个核心素养:科学素养、技术素养、工程素养、艺术素养、数学素养以及六个主要特征性:跨学科、趣味性、体验性、情境性、协作性、实证性.依托人工智能技术背景进行相关电动汽车的教学课程体系设计,探索基于人工智能背景下的STEAM人才培养模式,该STEAM课程体系开发模式可以对当前中小学STEAM教育提供有益的借鉴.

The novel orange emitting long persistent phosphor (LPP) Sm3+-doped CdGeO3 was prepared successfully via a traditional high temperature solid-state reaction method. It shows orange long persistent luminescence (LPL) after the excitation by ultraviolet light. The optimal concentration of Sm3+ ions for the brightest photoluminescence (PL) emission and the best LPL characteristic were experimentally determined to be about 1 mol% and 0.5 mol%, respectively. The incorporation of Sm3+ ions into the CdGeO3 host has a great influence on the trap density. Furthermore, the origin and the mechanism of the orange LPL were also discussed.

We describe the preparation of a novel red-emitting Li2MgTi3O8:Mn4+ nanocrystalline phosphor by a soft chemical method. Li2MgTi3O8:Mn4+ phosphor gained our attention and interest due to its low-cost and unique luminescent properties. The deep red emission from Li2MgTi3O8: Mn4+ shows an abnormal broad band at 680 nm, with a quantum efficiency (QE) of 34%, and good thermal resistance of Delta E = 0.214 eV Li2MgTi3O8:Mn4+ phosphor exhibits the most intense excitation absorption in the blue region which matches the emission wavelength of the blue LEDs, indicating its potential to enhance the color rendering performance of white LEDs. The deep red emission originates from the E-2(g) -> (4)A(2g) transition of Mn4+. The spectral features are well explained by the Tanabe-Sugano diagram, with crystal-field and Racah parameters of Dq = 2.06 x 10(3) cm(-1), B = 0.76 x 10(3) cm(-1) and C = 3.00 x 10(3) cm(-1). A device was fabricated in which this red phosphor Li2MgTi3O8:Mn4+ was used to coat the blue LEDs. The fabricated device demonstrated that the prepared material can act as a novel potential red phosphor for warm white LEDs. (C) 2016 Elsevier B.V. All rights reserved.

The exploration of new red phosphor based on rare-earth free ion activated oxide is of great practical value in the field of phosphors converted white light-emitting diode(w-LED) lightings. Here, we report on a novel Mn4+-doped Li2MgTiO4 phosphor prepared by a solid-state reaction route, matching with the blue chips and showing strong deep red emission with an abnormal broad band centered at similar to 676nm. The crystal structure of Li2MgTiO4 is identified and investigated by Rietveld refinement. The crystal field strength (Dq) and the Racah parameters (B and C) are estimated to evaluate the nephelauxetic effect of Me suffered in Li2MgTiO4 host lattice. The calculated results well conform to show linear dependence of E((2)Eg) on beta(1) parameter which may provide an indication of the Mn(4+)emission position on the basis of beta(1). The photoluminescence properties are investigated systematically with the aid of diffuse reflection spectra, steady and transient state fluorescence measurements at high, low and room temperature. Concentration quenching and thermal quenching are elucidated in detail. As proof of concept, the as-prepared Li2MgTiO4:Mn and commercial YAG:Ce phosphors are applied to the package of a blue LED chip to fabricate a warm w-LED. (C) 2015 Elsevier B.V. All rights reserved.

A series of novel red-emitting Na2Ca3 - x Si2O8:xEu(3+) phosphors were synthesized by solid state reactions. The phosphors can strongly absorb 395 nm light, and show red emission with a good color purity. The excitation and emission spectra properties of Na2Ca3Si2O8:Eu3+ were characterized. Na2Ca3Si2O8:Eu3+ with self-compensated and alkali metal ions charge compensated approaches (2Ca(2+)-> Eu3+ + M+, M = Li+, Na+, K+) have investigated, which found that the red emission of luminescent intensity can be greatly enhanced, and shows superior luminescent property to the commercial Y(2)0(3)S:Eu3+. The present work implies that the efficient charge compensated phosphors are promising candidates as red-emitting phosphor for w-LEDs.

Long persistent phosphors in the near-infrared (NIR) region have attracted much attention due to the potential application in in vivo imaging. La3GaGe5O16:Cr3+ phosphor presents a NIR long persistent luminescence after the short UV-irradiation. La3GaGe5O16 host also exhibits a cyan persistent luminescence. The optimal concentration of Cr3+ in La3GaGe5O16 is experimentally about 0.01 and the afterglow time can last more than 30 min. The estimated trap depth which varies continuously as a function of delay time is evidence for the presence of a continuous trap distribution. In order to improve the performance of afterglow luminescence of the La3GaGe5O16:Cr3+, we modified composition around Cr3+ by adjusting the Ge/O content. La3GaGe5O16:Cr3+ is shown to be a new near-infrared persistent phosphor potentially suitable for in vivo imaging due to its 650nm-750nm emission range. (C) 2016 Optical Society of America

The discovery of non-rare-earth doped oxide red phosphor, particularly excitable by light in the wavelength from 380 to 480nm, is of great interest in the field of energy-efficient w-LED lighting. Here, we report a potential candidate of red phosphor for warm w-LEDs. Mn4+-doped SrGe4O9 phosphors that show deep red emission upon blue excitation were prepared by a solid-state reaction route. The luminescent performance is characterized by steady-state photoluminescence (PL) spectra, fluorescence decay curves and temperature-dependent photoluminescence measurements. The concentration quenching phenomenon is clarified. The resistance of Mn4+ photoluminescence to thermal impact after a cycle experiment by heating and cooling the sample between 35°C and 210°C has also been studied. It proves that SrGe4O9:Mn4+ possesses good thermal stability. Based on configuration coordinate schematic diagram, the thermal quenching mechanism is discussed. It may be a potential red phosphor which is applied to the package of a blue LED for warm w-LEDs.

A novel blue‐emitting phosphor Na2ZnGeO4 and a novel green‐emitting phosphor Na2ZnGeO4:Mn2+ have been newly developed via high‐temperature solid‐state reaction. The crystal structure of Na2ZnGeO4 has been identified. Energy transfer from Na2ZnGeO4 host to Mn2+ ions was affirmed. Undoped and Mn2+‐doped Na2ZnGeO4 phosphors exhibit blue and green long persistent luminescence (LPL) with persistent duration more than 40 min and 4 h, respectively. The traps created in host lattice were clarified. The LPL mechanism in Na2ZnGeO4 and Na2ZnGeO4: Mn2+ was discussed briefly. This investigation provides two new and efficient long persistent phosphors (LPPs).

A novel host lattice Na2Ca3Si2O8 was used for synthesizing long persistent phosphors for the first time. A blue-emitting long persistent phosphor was prepared successfully via a traditional high temperature solid-state reaction method. The phase structure was checked by XRD. The photoluminescence and persistent luminescence decay properties of Ce3+-doped samples were studied systematically. The defects acting as traps were investigated by thermoluminescence. It demonstrated that the doping Ce3+ ions into the Na2Ca3Si2O8 host not only largely enriched the intrinsic traps but also introduced abundant new extrinsic traps which play a determining role in the generation of persistent luminescence. The origin of the persistent luminescence was analyzed and a related mechanism was systematically discussed based on a schematic diagram as well.

Photochromic materials have attracted increasing interest as optical switches and erasable optical memory media.

The blue–green-emitting Na2Ca3Si2O8:Tb3+ phosphors were prepared successfully via a traditional high temperature solid-state reaction method. The crystal phase was checked by XRD. The dependence of photoluminescence excitation, photoluminescence and fluorescence decay properties on Tb3+ doping concentration was studied in detail. The emission color can be modified from blue to green based on cross-relaxation through tuning the doping concentration of Tb3+ ions. The cross-relaxation from 5D3 to 5D4 state which was investigated by spectroscopic and dynamic measurements was also illustrated with an energy level scheme. It may be a good candidate for blue and green phosphor.

We gained insight into the temperature-dependent relative emission intensity of La3GaGe5O16: Mn4+phosphor, and the luminescence quenching temperature and the activation energy for thermal quenching (ΔE) were obtained.

Mechanoluminescence is a type of luminescence caused by the application of mechanical ener-gy to solids.In this paper,powder of BaZrSi 3 O9 is synthesized by the conventional solid state reaction.Then thermoluminescence and mechanoluminescent properties are studied.Phase and crystal structure of the obtained materials can be determined by X-ray diffraction ( XRD).Hence photoluminescent spectrum and mechanoluminescent measurement show that the emission peak is about 435 nm.The mechanolumi-nescence results present that the intensities of samples are well dependent on the stress,indicating that these mechanoluninescent materials can be potentially used as sensors to detect the dynamic visualization of stress distribution of an object.The results also suggest that the trap and the worse symmetry of crystal structure are responsible for the mechanoluninescent intensity of BaZrSi 3 O9.

Pr3+-doped Cd2GeO4 phosphors were synthesized successfully via a traditional high temperature solid-state reaction method. It showed yellowish-pink long persistent luminescence (LPL) after the short UV-irradiation. The optimal doping concentration of Pr3+ ions for the brightest photoluminescence (PL) emission and the best LPL performance were experimentally to be about 1.5% and 1 mol%, respectively. The suitable trap depth for the generation of LPL was determined to be about 0.65 eV. Based on TL measurements, the trapping and re-trapping processes of charge carriers were studied. A model was proposed on the basis of experimental results to explain the mechanisms of PL and LPL. (C) 2014 Elsevier B.V. All rights reserved.

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Polycrystalline powders of CdGeO3:xPr3+ containing up to 5 mol% Pr are prepared by solid state reactions of stoichiometric mixtures of CdCO3, GeO2, and Pr6O11 (corundum crucibles, 1050 °C, 5 h).

The hardware circuit for smart model helicopter is designed, and an analysis of the circuit de-sign points is made. The procedural framework is given, helicopter comprehensive gestures are calulated, by reading the data on the remote control helicopter attitude sensor, going through the Kalman filter. Intelligent control is realized for helicopters combined with PID algorithm. In the test to verify the smart model aircraft he-licopter, the experiment shows that the system reduces the difficulty of the operation of the helicopter model air-craft, and reduced the probability of crashing.

A series of Bi3+ and Gd3+ doped ZnB2O4 phosphors were synthesized with solid state reaction technique. X-ray diffraction technique was employed to study the structure of prepared samples. Excitation and emission spectra were recorded to investigate the luminescence properties of phosphors. The doping of Bi3+ or Gd3+ with a small amount (no more than 3 mol%) does not change the structure of prepared samples remarkably. Bi3+ in ZnB2O4 can emit intense broad-band purplish blue light peaking at 428 nm under the excitation of a broad-band peaking at 329 nm. The optimal doping concentration of Bi3+ is experimentally ascertained to be 0.5 mol%. The decay time of Bi3+ in ZnB2O4 changes from 0.88 to 1.69 ms. Gd3+ in ZnB2O4 can be excited with 254 nm ultraviolet light and yield intense 312 nm emission. The optimal doping concentration of Gd3+ is experimentally ascertained to be 5 mol%. The decay time of Gd3+ in ZnB2O4 changes from 0.42 to 1.36 ms. (C) 2014 Elsevier B.V. All rights reserved.