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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • sodium lighting system
  • modeling
  • radiation curves
  • LED lighting system
  • software goniophotometer
  • upper half-space
应用领域
  • Electrical Engineering and Automation
机构单位
  • VSB-TU Ostrava
91 条数据
?? 中文（中国） ▾

  • Quantifying Large Lattice Relaxations in Photovoltaic Devices

    摘要： Temporal variations of Cu(In, Ga)Se2 photovoltaic device properties during light exposure at various temperatures and voltage biases for times up to 100 h are analyzed using the kinetic theory of large lattice relaxations. Open-circuit voltage and p-type doping increased with charge injection and decreased with temperature at low injection conditions. Lattice relaxation can account for both trends and activation energies extracted from the data are approximately 0.9 and 1.2 eV for devices with lower and higher sodium content, respectively. In these devices, increased sodium content resulted in higher initial p-type doping with greater stability. First-principles calculations providing revised activation energies for the (VSe ? VCu) complex suggest that this defect does not account for the metastability observed here.

    关键词： sodium content,lattice relaxations,metastability,CIGS,photovoltaic devices

    更新于2025-09-23 15:19:57

  • Alleviating the toxicity of quantum dots to Phanerochaete chrysosporium by sodium hydrosulfide and cysteine

    摘要： Quantum dots (QDs) have caused large challenges in clinical tests and biomedical applications due to their potential toxicity from nanosize effects and heavy metal components. In this study, the physiological responses of Phanerochaete chrysosporium (P. chrysosporium) to CdSe/ZnS QDs with either an inorganic sulfide NaHS or an organic sulfide cysteine as antidote have been investigated. Scanning electron microscope analysis showed that the hyphal structure and morphology of P. chrysosporium have obviously changed after exposure to 100 nM of COOH CdSe/ZnS 505, NH2 CdSe/ZnS 505, NH2 CdSe/ZnS 565, or NH2 CdSe/ZnS 625. Fourier transform infrared spectroscopy analysis indicated that the existence of hydroxyl, amino, and carboxyl groups on cell surface could possibly conduct the stabilization of QDs in an aqueous medium. However, after NaHS or cysteine treatment, the cell viability of P. chrysosporium exposed to CdSe/ZnS QDs increased as compared to control group, since NaHS and cysteine have assisted P. chrysosporium to alleviate oxidative damage by regulating lipid peroxidation and superoxide production. Meanwhile, NaHS and cysteine have also stimulated P. chrysosporium to produce more antioxidant enzymes (superoxide dismutase and catalase), which played significant roles in the defense system. In addition, NaHS and cysteine were used by P. chrysosporium as sulfide sources to promote the glutathione biosynthesis to relieve CdSe/ZnS QDs-induced oxidative stress. This work revealed that sulfide sources (NaHS and cysteine) exerted a strong positive effect in P. chrysosporium against the toxicity induced by CdSe/ZnS QDs.

    关键词： Detoxification,Cysteine,CdSe/ZnS quantum dots,Sodium hydrosulfide,Antioxidant enzymes,Oxidative stress

    更新于2025-09-23 15:19:57

  • Influence of Molybdenum Back Contact on the PID Effect for Cu(In,Ga)Se2 Solar Cells

    摘要： The authors investigated the effect of an applied high voltage (1 kV) across the thickness of a soda-lime glass substrate of Cu(In,Ga)Se2 (CIGS) thin-film solar cells. Two types of CIGS cells were tested, differing only in the deposition process of the molybdenum (Mo) back contact. Whilst one cell type was susceptible to potential induced degradation (PID), the other exhibited highly increased stability against PID. PID occurs for PID-susceptible cells after the transfer of a certain amount of charge through the soda-lime glass substrate when the Mo back contact of the cell operates as a cathode (negatively biased versus backside of the substrate). Capacitance–voltage and electron-beam-induced current measurements showed an enlarged space charge region expanding to the Mo back contact and a lowered doping density by a negative potential for PID-susceptible cells. Glow discharge optical emission spectroscopy (GDOES) revealed an accumulation of sodium (Na) in the solution-grown CdS buffer layer and a segregation on the surface of the ZnO:Al window layer for higher charges for PID-susceptible cells. Cells with increased PID immunity did not show an increase of Na for charges up to around 9 mC/cm2. We demonstrate that it is possible to improve the PID stability of CIGS solar cells by modification of the molybdenum back contact.

    关键词： sodium,photovoltaic,PID,CIGS,GDOES,EBIC,CV,stability PV

    更新于2025-09-23 15:19:57

  • Detection of salinity in the process of heating seawater by using a directional coupler of the multimode plastic optical fiber with a plane mirror as a reflector

    摘要： Plastic optical ?ber (POF) FD 620 10 has been widely used in various sensors with the basic principle of utilizing the intensity received because of re?ection, one of which is used as a displacement sensor. In this study, POF was used as a directional coupler and was applied for the detection of the refractive index of sodium chloride (NaCl) solutions due to changes in concentration and detection of salinity in the process seawater heating. The results of this study indicate that the sensor system has succeeded in detecting the refractive index of the NaCl solution at a concentration of 0–20% and changes in the salinity of seawater due to the heating process. This sensor system is simple and easy to use, and the manufacturing cost is rel- atively cheap. The results of this study indicate that the sensor system has succeeded in detecting the refractive index of the NaCl solution at a concentration of 0–20% and changes in the salinity of seawater due to the heating process at the temperature range from 13 to 58 (cid:3)C. This sensor system is simple and easy to use and the manufac- turing cost is relatively cheap.

    关键词： Sodium chloride,Refractive index,POF

    更新于2025-09-23 15:19:57

  • The antibacterial effect of potassium-sodium niobate ceramics based on controlling piezoelectric properties

    摘要： The implant infection is one of the most serious postsurgical complications of medical device implantation. Therefore, the development of biocompatible materials with improved antibacterial properties is of great importance. It might be a new insight to apply the intrinsic electrical properties of biomaterials to solve this problem. Here, potassium-sodium niobate piezoceramics (K0.5Na0.5NbO3, KNN) with different piezoelectric constants were prepared, and the microstructures and piezoelectric properties of these piezoceramics were evaluated. Moreover, the antibacterial effect and biocompatibility of these piezoceramics were assayed. Results showed that these piezoceramics were able to decrease the colonies of bacteria staphylococcus aureus (S. aureus), favor the rat bone marrow mesenchymal stem cells (rBMSCs) proliferation and promote the cell adhesion and spreading. The above effects were found closely related to the surface positive charges of the piezoceramics, and the sample bearing the most positive charges on its surface (sample 80KNN) had the best performance in both antibacterial effect and biocompatibility. Based on our work, it is feasible to develop biocompatible antibacterial materials by controlling piezoelectric properties.

    关键词： Positive charges,Biocompatibility,Potassium-sodium niobate,Antibacterial property

    更新于2025-09-23 15:19:57

  • Excellent electrostrictive coefficient in bismuth sodium titanate-based ceramics via regulating degree of diffuseness and phase composition

    摘要： Herein, the strain (S) with low hysteresis can be achieved in [Bi0.5(Na0.72K0.18Li0.10)0.5]0.995Sr0.005(Ti0.995Ta0.005)O3-BaZrO3-NaNbO3 ceramics by an electrostrictive effect, and an excellent electrostrictive coefficient (Q33) of ～0.037 m4/C2 can be obtained under an electric field of 60 kV/cm. The enhancement of the degree of diffuseness regulated by phase compositions can effectively promote the electrostrictive response and increase the Q33 value. A higher ratio of P4bm and a larger Ps in P4bm guarantee the good linear relationship between S and P2 (P represents polarization), where a larger Ps (P4bm) can effectively restrict the expression of ferroelectric state with the increase of electric fields (E). Consequently, high Q33 values (0.033–0.037 m4/C2) are nearly independent of the applied electric fields. Although the strain from the electrostrictive effect is not tremendous, the good linear relationship between S and P2 is meaningful to the accurate displacement control in displacement actuators.

    关键词： phase composition,degree of diffuseness,electrostrictive coefficient,bismuth sodium titanate-based ceramics

    更新于2025-09-23 15:19:57

  • Fluorescence-Guided Neurosurgery (Neuro-oncology and Cerebrovascular Applications) || 1 Current Fluorescence-Guided Neurosurgery and Moving Forward

    摘要： This introductory chapter provides a current overview of fluorescence-guided neurosurgery and includes future directions. The concepts of fluorescence and fluorescence-guided surgery (FGS) are introduced. Currently used fluorescent contrast agents in patients are summarized, including 5-aminolevulinic acid (5-ALA), fluorescein, and indocyanine green. Excitation light sources are discussed for each fluorescent contrast agent. Targeted fluorophores under clinical development for FGS are also introduced. Future directions in fluorescence-guided neurosurgery including handheld devices to better detect tumor fluorescence, dual fluorophore imaging, metabolic imaging in combination with FGS, and detection of the tumor margin will be discussed.

    关键词： near-infrared imaging,fluorophore,indocyanine green,fluorescence-guided neurosurgery,fluorescence,operative microscope,fluorescence-guided surgery,fluorescein sodium,5-ALA

    更新于2025-09-19 17:15:36

  • Effect of Sodium and Fluorine Co-Doping on the Properties of Fluorite-Like Rare-Earth Molybdates of Nd5Mo3O16 type

    摘要： Fluorite-like oxyfluorides NaLn4Mo3O15F (Ln = La, Pr, Nd), which relate to the Nd5Mo3O16 structural type, were obtained by solid-phase synthesis in the air. Codoping of the Nd5Mo3O16+δ family with sodium and fluorine led to the appearance of a piezoelectric effect and a reversible phase transition in oxyfluorides, accompanied by a jump in the conductivity and an anomaly of the permittivity of the compounds. In contrast to Nd5Mo3O16+δ, which possess mixed oxide-ion/electronic interstitial conductivity, the NaLn4Mo3O15F compounds can have oxygen conductivity of vacancy type. The highest conductivity offered by these materials is 3.2×10–2 S/cm at 700 °C. NaLn4Mo3O15F compounds were found to be hygroscopic and can be considered as potential proton conductors.

    关键词： rare earths,sodium,phase transitions,fluorine,solid-phase synthesis

    更新于2025-09-19 17:15:36

  • [IEEE 2018 Seventh Balkan Conference on Lighting (BalkanLight) - Varna (2018.9.20-2018.9.22)] 2018 Seventh Balkan Conference on Lighting (BalkanLight) - Particularities of photometric calculation and non-sinusoidal operation regime of luminaires with high pressure sodium vapour lamps

    摘要： In the first part of this paper, the authors present an analysis from photometrical (technical lighting) point of view of a DELFIN 03 type luminaire used in the modern street lighting. For this it started from determining by calculation (using a numerical calculation method - the method of equal plane angles) of the total luminous flux emitted by the street luminaire (polar photometric curves are required - polar luminous intensity distribution in different planes) and of the efficiency. The distribution of illuminances to different montage heights was then analyzed. In the second part of the paper, is presented a comparative study of the harmonic (distorted) regime produced by these luminaires equipped with high pressure sodium vapour tubular lamps type HST E40 socket, 250 W, for a network of street public lighting. In this regard was used an own conception computation program, developed in the Mathcad programming environment completed with an Excel subprogram.

    关键词： harmonic analysis,photometric calculation,luminaires,high pressure sodium vapour lamps,non-sinusoidal operation regime

    更新于2025-09-19 17:15:36

  • One dimensional hierarchical BiOCl microrods: their synthesis and their photocatalytic performance

    摘要： In this work, one dimensional hierarchical BiOCl microrods were controllably synthesized via a hydrothermal method using sodium citrate as the structure-directing agent. Each hierarchical BiOCl structure is made up of many BiOCl nanosheets in which the size and thickness are controlled by the concentration of sodium citrate. The high-resolution transmission electron microscopy (HRTEM) measurements show that each nanosheet consists of the BiOCl hierarchical structure with exposed (001) (top surface) and (110) (side surface) facets. With the amount of sodium citrate increasing, the ratio (110)/(001) gradually increases. These hierarchical BiOCl architectures exhibit a more outstanding photocatalytic activity than BiOCl nanosheets with exposed (001) facets, and rhodamine B (RhB) and methyl orange (MO) can be degraded in 3 and 4 min, respectively. This enhanced photocatalytic performance is ascribed to the fast separation and transfer of photogenerated electron–hole pairs, the formation of hierarchical architectures and the large BET surface areas. Radical scavenger experiments indicate that holes (h+) and superoxide radicals (˙O2?) are the main active species for MO degradation during the photocatalytic process.

    关键词： BiOCl,hydrothermal synthesis,photocatalytic activity,hierarchical structure,sodium citrate

    更新于2025-09-19 17:15:36