Search

Graphitic carbon nitride (CN) is considered to be a promising metal-free photocatalyst, but the charge carrier separation and rapid complexation of electrons and holes are difficult to modulate for effective and comprehensive photodegradation of TC.

Bundled cobalt ferrites (CoFe2O4) nanowires (BNWs) were successfully prepared by nanocasting pathway with ordered mesoporous SiO2 (SBA-15) templates. The well-dispersed CoFe2O4 nanowires (NWS) were separated from CoFe2O4 BNWs by centrifugal technology. Microstructure characterization indicated that CoFe2O4 BNWs and NWS possessed the same diameter and similar length. Thus, the influence of surface spins interaction between neighboring nanowires on the magnetic properties could be distinguished and discussed excluding the difference of morphology. Both samples presented ferromagnetism with the wasp-waisted hysteresis loops and the exchange bias effect was observed above 100 K. The surface spins interactions between the neighboring nanowires not only recombined the mismatch spins at the surface to form antiferromagnetic surface, but also inhibited the shape anisotropy of nanowires, leading to the decrease of saturation magnetization and coercivity of CoFe2O4 BNWs. The wasp-waisted hysteresis loops was attributed to the low temperature spin reorientation caused by the inclined spin on the surface of nanowires.

Single crystalline Ni gradient–diameter magnetic nanowire arrays (GDMNWs) with different D/d (the diameter of thick end (D) and thin end (d) of GDMNWs) were successfully prepared by constant potential electrodeposition into a tapered anodic aluminum oxide template. The TEM images of samples illustrated that the obvious gradient–diameter nanowires had been obtained. The HRTEM, SAED images and XRD pattern demonstrated that the nanowire arrays grew with Ni single crystal structures. The magnetic interaction of GDMNWs was investigated by first-order reversal curves (FORCs) and δM(H) plots. The FORCs diagrams and δM(H) plots of different D/d ratio were compared and indicated that the magnetic interaction of GDMNWs with a thin end was dominated by dipolar interaction, and the thick end was dominated by exchange interaction. There was a gradient overlap effect in dipolar interaction and exchange interaction between the thin end and thick end. The spatial distributions of such unique magnetic interaction of GDMNWs were likely to produce entirely new physical characteristics of memory effect and tunable ferromagnetic resonance.

In this paper, we analyze the information theory assisted massive media system for the estimation of ideological and political online guiding affinity. To construct the efficient system, we integrate the following technologies. (1) Based on the access method of TCP/IP, feedback of the authentication results can be obtained within the acceptable delay range in order to achieve a real-time authentication. (2) We construct an information theory model that remains suitable for calculating the similarity, so as to use the information in the data distribution. (3) Unlike existing point-by-point learning strategies based on convolutional neural networks, the proposed framework can learn core text results and four picture results from the search return. Our online guiding system is tested on the student groups in order to obtain satisfactory results.

Virtual cloud environment and data center for providing online ideological and political guidance for universities is designed and analyzed in this research. Various research highlights of the proposed work are summarized into three aspects. (1) The virtualization platform supports the basic real-time migration of the virtual machines, which is an important foundation for the high availability of the virtualization platform. (2) The main function of the cloud computation simulation platform is to perform basic correlation experiments and so on. (3) The online guiding system is optimized with the integration of high performance computing framework. The experiment has proven the effectiveness of the proposed methodology.

Owing to the advantages of the conductive activated carbon (AC) and capacitive Zn2SnO4, a series of Zn2SnO4/AC composites are successfully prepared by a co-precipitation method. The textural structure of Zn2SnO4/AC composites illustrate that the Zn2SnO4 nanoparticles are anchored into the micropores of AC. The systematical electrochemical investigation demonstrates that the specific capacitance of the Z-150 sample (including 25% Zn2SnO4) is 322.6 F g−1 at a current density of 1 A g−1. The specific capacitance values are retained 96.5%, 91.1% and 81.6% at the current density of 1 A g−1, 8 A g−1 and 16 A g−1 after 3000 cycles, respectively. This confirms the excellent electrochemical performance and good long-term cycling stability of Zn2SnO4/AC composites as supercapacitor electrodes at high current densities.

FeCoNi MNWs with uniform and gradient diameter are successfully prepared by three-electrode constant potential deposition in AAO template. The deposition time of FeCoNi MNWs overgrow in the AAO template are investigated. The morphology and structure of FeCoNi MNWs are characterized by TEM, EDS, SAED and XRD. The effects of magnetization reversal mechanism, magnetic interaction, magnetic domain states and reversibility of FeCoNi MNWs are studied by FORCs technology. The results show that the magnetization reversal mechanism of UDNWs-20 present coherent mode, while UDNWs-60 and UDNWs-100 present curling mode as well as coherent mode. There is a transition of curling inverse to coherent inverse in magnetic reversal of GDNWs-20~100. When the UDNWs diameter increase from 20 nm to 60 nm and 100 nm, the domain state change from SD to MD state and the irreversible component reduce from about 100% to 71.3% and 60.2%. The SD GDNWs-20~100 contains 72.8% irreversible and 27.2% reversible components. The magnetic interaction, magnetic domain states and reversibility of FeCoNi GDNWs are different from those of UDNWs.

Magnetic nanowires arrays are an important type of structures for magnetic recording media and spintronic devices owe to their unique order dense packing system. Here, gradient diameter FeNi alloys nanowires arrays (GDNWs) were successfully prepared by a constant potential electrodeposition method into a tapered anodic aluminium oxide template. The transmission electron microscopy (TEM), electronic differential system (EDS), selected area electron diffraction (SAED) and X-ray diffraction (XRD) demonstrated that the polycrystalline fcc Fe30Ni70 GDNWs were obtained and the GDNWs diameter decreasing linearly from the thick end to the thin end was about 106 nm and 28 nm. The effects of gradient diameter on magnetic properties of GDNWs were compared to uniform diameter FeNi nanowires (UDNWs) by hysteresis measurements and first-order reversal curves (FORCs) curves. The results revealed that increasing UDNWs diameter changed domain state from single domain (SD) to multi-domain (MD) state and decreased the irreversible components. However, with changing gradient diameter, the domain state of GDNWs was SD, and the SD GDNWs with enhanced magnetostatic interactions had irreversible components of 83.5% and reversible components of 16.5%. The magnetic interaction, magnetic domain states and reversibility of GDNWs were different from those of UDNWs.

The reaction of HCl with Ca ( OH ) 2 is investigated at industrially relevant conditions of 10% relative humidity, 250 ppm or less HCl in nitrogen and a temperature of 100 °C. A particle model is used where an interface step and diffusion in pores as well as in solid state are taken into account. The textural parameters of the model are based on data of commercially available Ca ( OH ) 2 . Most importantly Ca ( OH ) 2 single crystals are exposed to HCl containing gas to independently determine the product layer diffusion coefficient. A comparison between model simulations and single-particle (SP) experiments that are performed by means of an ultrasonic levitator (i.e., a particle is held against gravity without neighbouring surfaces) reveals that the overall reaction is solely governed by pore diffusion since the interface step is reaching equilibrium almost instantly and solid-state diffusion in conjunction with mean pore wall thickness is fast at 1.78 × 10 - 14 m 2 s - 1 . Elementary analyses of Cl across the cross-sections of the SP show significant local textural and chemical variability that cannot be fully explained yet.

CoFe2O4 and CoxFey were anchored into activated carbon (AC) to synthesize CoFe2O4/CoxFey/AC composites using the sol–gel method for Cd(II) adsorption from wastewater. The results indicated that CoFe2O4 and CoxFey nanoparticles existed in the pores of AC. The magnetic properties of CoFe2O4/CoxFey/AC indicated it could be separated and retrieved easily using an external magnet after Cd(II) adsorption. The effects of solution pH, temperature and initial Cd(II) concentration on the Cd(II) adsorption of AC and CoFe2O4/CoxFey/AC were investigated. The standard free energy, enthalpy change and entropy change were evaluated. The kinetic parameters of Langmuir and Freundlich isothermal equation were analyzed, and the Freundlich kinetic model was feasible for describing the Cd(II) adsorption process of CoFe2O4/CoxFey/AC composites.

To evaluate the prevalence of primary gout in the Shantou area, China, and to understand its clinical features.Samples from three surveys of the Chenghai across ten years were studied. Clinical, laboratory and radiology data of 419 cases of primary gout were collected and analyzed.Prevalence of primary gout in the three surveys were 0.17%, 0.15% and 0.26%, respectively. Among the clinical patients, the ratio of male to female was 21:1; the average age of onset of women was significantly higher than that of men. The number of cases in the last ten years has been increasing. In the first wave of cases, the first metatarsophalangeal joint was involved in 82.1% of all cases; no fourth metatarsophalangeal joint involvement had been observed. Hyperlipemia was the most common accompanying abnormal laboratory test (57.1%). Radiographic bone erosion was found in 49.4% patients, most of them with disease duration more than 5 years.The prevalence of primary gout in Shantou area has been increasing in the last ten years. Changes in diet and lifestyle may be responsible for this rapid increase.