Heteroepitaxial growth of ZnO branches selectively on TiO2 nanorod tips with improved light harvesting performance

A seeded heteroepitaxial growth of ZnO nanorods selectively on TiO2 nanorod tips was achieved by restricting crystal growth on highly hydrophobic TiO2 nanorod film surfaces. Intriguing light harvesting performance and efficient charge transport efficiency has been found, which suggest potential applications in photovoltaics and optoelectronics

Preparation of Phase Homogeneous Mn-Zn Ferrite Powder by Spray Pyrolysis

Two kinds of aqueous precursor solutions are used to synthesize Mn-Zn ferrite powders: (i) nitrate (NO) precursor-derived from solutions of Mn(NO3)2, Zn(NO3)2, and Fe(NO3)3; and (ii) acetate (AC) precursor-derived from solutions of Mn(CH3COOO)2, Zn(CHCH3COOO)2, and Fe(NO3)3. The composition of the powders synthesized from the precursor AC is very uniform, whereas powders derived from the precursor NO have Mn and Zn segregated on the particle surfaces. In addition, the powders synthesized from precursor AC are solid spherical particles with fine porosity, whereas many hollow and fragmented particles are observed in the powder derived from precursor NO. Overall, the properties of Mn-Zn ferrite cores prepared from the precursor AC are superior to those prepared from the precursor NO. The reasons for the differences are explained and described in detail. The AC precursor powders synthesized by spray pyrolysis produced Mn-Zn ferrite cores with good magnetic properties

Functional Carbon Nanotube/Mesoporous Carbon/MnO 2

A functional carbon nanotube/mesoporous carbon/MnO2 hybrid network has been developed successfully through a facile route. The resulting composites exhibited a high specific capacitance of 351 F/g at 1 A g−1, with intriguing charge/discharge rate performance and cycling stability due to a synergistic combination of large surface area and excellent electron-transport capabilities of MnO2 with the good conductivity of the carbon nanotube/mesoporous carbon networks. Such composite shows great potential to be used as electrodes for supercapacitors

Het tijdskrediet eindeloopbaan : verlengt het de beroepsloopbaan?

In deze studie onderzoeken we hoe deeltijds werk gekoppeld aan tijdskrediet in de private sector de kans beïnvloedt om op het einde van de loopbaan aan het werk te blijven . We houden rekening met selecte deelname aan het tijdskrediet door te controleren voor een uitgebreide set van individuele kenmerken en indicatoren van de volledige arbeidsgeschiedenis van werknemers. We vinden dat het tijdskrediet de kans om aan het werk te blijven gedurende de eerste twee (vier) jaar significant verhoogt. Wanneer de begunstigden van het tijdskrediet recht krijgen op een vervroegd pensioen, keert dit positieve effect echter en treden de begunstigden vroeger uit de arbeidsmarkt dan wanneer ze geen tijdskrediet hadden opgenomen. Deze resultaten suggereren dat het tijdskrediet initieel de balans tussen werk en vrije tijd herstelt, maar dat het uiteindelijk de hechting met de arbeidsmarkt doet verliezen. Deeltijds gaan werken op het einde van de loopbaan verlaagt ook licht de kans op ziekteverzuim, maar dit effect is statistisch niet significant verschillend van nul. Een kosten-baten analyse geeft aan dat de maatschappelijke kosten over het algemeen groter zijn de baten voor de samenleving

Lineament Length and Density Analyses Based on the Segment Tracing Algorithm: A Case Study of the Gaosong Field in Gejiu Tin Mine, China

This study used the Segment Tracing Algorithm (STA) to extract lineaments from remotely sensed images. A computer program was then written to calculate the lineament densities and lengths. In Gaosong field, 3,233 lineaments were extracted based on a 200 m × 200 m grid size. The results indicate that most lineaments lengths are between 30 m and 50 m, and the number of lineaments within each cell ranges from 1 to 6. Areas with high distributions exist on both sides of the central region. According to the contour map of lineament length, the maximum lineament length is 380 m, and the minimum length is 30 m. The contours mainly extend in two directions, including NE and NW trends. This is consistent with the prominent NE and NW strike faults that prevail in the mining area. The results are similar to those obtained in the Machishui ore block, which has become a mine production area. High values of lineament length and density in the contour map of Gaosong field may be associated with hydrothermal tin mineralization in the study area. The results of this study potentially provide a new approach to mineral exploration in the early stage of geological prospecting

Heteroepitaxial growth of ZnO branches selectively on TiO2 nanorod tips with improved light harvesting performance

A seeded heteroepitaxial growth of ZnO nanorods selectively on TiO2 nanorod tips was achieved by restricting crystal growth on highly hydrophobic TiO2 nanorod film surfaces. Intriguing light harvesting performance and efficient charge transport efficiency has been found, which suggest potential applications in photovoltaics and optoelectronics

Confining MoS2 nanocrystals in MOF-derived carbon for high performance lithium and potassium storage

Developing an efficient synthesis protocol to simultaneously control 2D nanomaterials’ size and dispersion is the pivot to optimize their electrochemical performance. Herein, we report the synthesis of uniform MoS2 nanocrystals well-anchored into the void space of porous carbon (donated as MoS2⊂C hybrids) by a simple confined reaction in metal–organic framework (MOF) during carbonization process. The strong confinement effect refrain MoS2 growth and aggregation, generating abundant active centers and edges, which contribute fast lithium/potassium reaction kinetics. In addition to the hybridization with the derived carbon, the MoS2⊂C hybrids exhibit rapid Li+ transfer rate (∼10−9 cm2 s−1) and greatly improved electronic conductivity. Consequently, the MoS2⊂C hybrids show ultrafast rate performances and satisfactory cycling stabilities as anode materials for both lithium and potassium ion batteries. This work demonstrates a universal tactic to achieve high dispersive 2D nanomaterials with tailorable particle size. © 2020 Institute of Process Engineering, Chinese Academy of SciencesNational Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21975074, 91534202, 91834301]; Basic Research Program of Shanghai [17JC1402300]; Shanghai Scientific and Technological Innovation Project [18JC1410500]; National Program for Support of TopNotch Young Professionals; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities [222201718002

Density Peak Clustering Based on Relative Density Optimization

Among numerous clustering algorithms, clustering by fast search and find of density peaks (DPC) is favoured because it is less affected by shapes and density structures of the data set. However, DPC still shows some limitations in clustering of data set with heterogeneity clusters and easily makes mistakes in assignment of remaining points. The new algorithm, density peak clustering based on relative density optimization (RDO-DPC), is proposed to settle these problems and try obtaining better results. With the help of neighborhood information of sample points, the proposed algorithm defines relative density of the sample data and searches and recognizes density peaks of the nonhomogeneous distribution as cluster centers. A new assignment strategy is proposed to solve the abundance classification problem. The experiments on synthetic and real data sets show good performance of the proposed algorithm

Hierarchical porous NiCo2O4 nanowires for high-rate supercapacitors

We demonstrate a simple and scalable strategy for synthesizing hierarchical porous NiCo2O4 nanowires which exhibit a high specific capacitance of 743 F g−1 at 1 A g−1 with excellent rate performance (78.6% capacity retention at 40 A g−1) and cycling stability (only 6.2% loss after 3000 cycles)