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  • Walter de Gruyter GmbH  (30)
  • 1
    Online Resource
    Online Resource
    Fast separation of Cu2+ and Ni2+ in sulfate solution by Lix984N extraction using a microchannel chip
    Walter de Gruyter GmbH ; 2018
    In:  Green Processing and Synthesis Vol. 7, No. 3 ( 2018-06-27), p. 207-216
    Details
    In: Green Processing and Synthesis, Walter de Gruyter GmbH, Vol. 7, No. 3 ( 2018-06-27), p. 207-216
    Abstract: A comparison study about the extraction and separation of Cu 2+ and Ni 2+ with Lix984N in a microchannel reactor and separating funnel has been conducted. The results showed that, in the microchannel reactor, the overall volumetric mass transfer coefficient of copper was 20 times that of nickel, whereas in the separating funnel, it was only 2 times that of nickel. In addition, the separation coefficient of copper and nickel in the microchannel reactor was 5 times that of the conventional one. Typically, at initial pH=2.5, contact time 1.95 s, volume fraction of extractant Lix984N 15% and within 1.9 g l −1 nickel ion concentration, the extraction rate of copper was higher than 95%, but the nickel was hardly extracted. In comparison, it needed almost 50 s to reach a Cu extraction of 95% in the separation funnel, with more than 5% Ni co-extraction rate. Although the microfluid extraction showed excellent extraction performance, there exists a need to further improve its processing capacity to apply it to industrial production. Furthermore, scaling up the microreactor has become increasingly promising under the fast developing 3D printing technology.
    Type of Medium: Online Resource
    ISSN: 2191-9550 , 2191-9542
    URL: Article
    DOI: 10.1515/gps-2016-0224
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2018
    detail.hit.zdb_id: 2645923-1
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  • 2
    Online Resource
    Online Resource
    Solvent extraction of Nd(III) in a Y type microchannel with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester
    Walter de Gruyter GmbH ; 2015
    In:  Green Processing and Synthesis Vol. 4, No. 1 ( 2015-01-1)
    Details
    In: Green Processing and Synthesis, Walter de Gruyter GmbH, Vol. 4, No. 1 ( 2015-01-1)
    Abstract: Conventional extraction equipment has many problems like a long mixing time, a large factory area occupation, a large amount of organic solvent consumption and so on. In this paper, a micro solvent extraction system for the extraction of Nd(III) was investigated to solve the above issues. The initial aqueous pH 4.0 and saponification rate 40% of 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (P507) were selected as the optimal experimental conditions. The extraction equilibrium was quickly achieved within 1.5 s, without any mechanical mixing in a narrow channel (100 μm in width and 120 μm in depth) at a volumetric flow rate from 5.55×10
    Type of Medium: Online Resource
    ISSN: 2191-9550 , 2191-9542
    URL: Article
    DOI: 10.1515/gps-2014-0095
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2015
    detail.hit.zdb_id: 2645923-1
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  • 3
    Online Resource
    Online Resource
    Ultracompact and low-power-consumption silicon thermo-optic switch for high-speed data
    Walter de Gruyter GmbH ; 2020
    In:  Nanophotonics Vol. 10, No. 2 ( 2020-12-11), p. 937-945
    Details
    In: Nanophotonics, Walter de Gruyter GmbH, Vol. 10, No. 2 ( 2020-12-11), p. 937-945
    Abstract: Ultracompact and low-power-consumption optical switches are desired for high-performance telecommunication networks and data centers. Here, we demonstrate an on-chip power-efficient 2 × 2 thermo-optic switch unit by using a suspended photonic crystal nanobeam structure. A submilliwatt switching power of 0.15 mW is obtained with a tuning efficiency of 7.71 nm/mW in a compact footprint of 60 μm × 16 μm. The bandwidth of the switch is properly designed for a four-level pulse amplitude modulation signal with a 124 Gb/s raw data rate. To the best of our knowledge, the proposed switch is the most power-efficient resonator-based thermo-optic switch unit with the highest tuning efficiency and data ever reported.
    Type of Medium: Online Resource
    ISSN: 2192-8606 , 2192-8614
    URL: Article
    DOI: 10.1515/nanoph-2020-0496
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2020
    detail.hit.zdb_id: 2674162-3
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  • 4
    Online Resource
    Online Resource
    Solvent extraction of In3+ with microreactor from leachant containing Fe2+ and Zn2+
    Walter de Gruyter GmbH ; 2014
    In:  Green Processing and Synthesis Vol. 3, No. 1 ( 2014-01-01)
    Details
    In: Green Processing and Synthesis, Walter de Gruyter GmbH, Vol. 3, No. 1 ( 2014-01-01)
    Type of Medium: Online Resource
    ISSN: 2191-9550 , 2191-9542
    URL: Article
    DOI: 10.1515/gps-2013-0048
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2014
    detail.hit.zdb_id: 2645923-1
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  • 5
    Online Resource
    Online Resource
    Triple-Endobutton and clavicular hook: A propensity score matching analysis
    Walter de Gruyter GmbH ; 2021
    In:  Open Medicine Vol. 16, No. 1 ( 2021-09-06), p. 1328-1335
    Details
    In: Open Medicine, Walter de Gruyter GmbH, Vol. 16, No. 1 ( 2021-09-06), p. 1328-1335
    Abstract: We retrospectively analyzed the clinical data of 635 patients with acute acromioclavicular dislocation, who underwent surgery in our hospital between May 2014 and June 2020. Patients were divided into group A (clavicular hook plate) and group B (Triple-Endobutton plates via double-incision). The propensity score analysis using one to one match was performed for comparisons. We obtained 292 matched patients’ data. The matched preoperative clinical characteristics were a balance between the two groups. All clinical parameters showed insignificant differences ( P 〉 0.05). Compared with group A, group B has longer operative time ( P 〈 0.001) and more blood loss ( P 〈 0.001); however, the mean incision length ( P 〈 0.001) and length of hospitalization ( P 〈 0.001) were shorter in group B than in the group A. The mean VAS in group B were significantly lower than in group A at each time point ( P 〈 0.001), and the UCLA shoulder score was higher in the group B. The CMS scores were also higher in group B than in group A, including before removal and 12 weeks after removal ( P 〈 0.001). The clinical efficacy of the double-incision Triple-Endobutton plate is better than the clavicular hook plate technology, and achieves anatomical reduction by reconstructing coracoclavicular ligament.
    Type of Medium: Online Resource
    ISSN: 2391-5463
    URL: Article
    DOI: 10.1515/med-2021-0339
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2021
    detail.hit.zdb_id: 2829380-0
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  • 6
    Online Resource
    Online Resource
    Preparation and properties of 3D interconnected CNTs/Cu composites
    Walter de Gruyter GmbH ; 2020
    In:  Nanotechnology Reviews Vol. 9, No. 1 ( 2020-03-12), p. 146-154
    Details
    In: Nanotechnology Reviews, Walter de Gruyter GmbH, Vol. 9, No. 1 ( 2020-03-12), p. 146-154
    Abstract: In this paper, the 3D pore structure of CuCr powders were obtained by pre-press shaping process, and finally the 3D interconnected carbon nanotubes/copper (CNTs/Cu) composites with excellent properties were insitu synthesized by chemical vapor deposition (CVD) and spark plasma sintering (SPS) technique. The morphology and structure of CNTs/ Cu composites are characterized by scanning electron microscopy (SEM), Raman spectra, transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and the results showed that the quality of CNTs and the interfacial bonding strength of CNTs/ Cu composites can be improved owing to the 3D pore structure. Meanwhile, the 3D pore structure was favorable to avoid pollution of CNTs during the synthesis process. The tensile strength of CNTs/ Cu composites increased to 421.2 MPa, with 47.6% enhancements compared to CuCr. Furthermore, the coefficient of friction (COF) reduced to 0.22 and the corrosion resistance were increased by 51.86% compared to CuCr. Consequently, our research provides a novel and an effective method for the synthesis of high quality CNTs/ Cu composites.
    Type of Medium: Online Resource
    ISSN: 2191-9097
    URL: Article
    DOI: 10.1515/ntrev-2020-0013
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2020
    detail.hit.zdb_id: 2646548-6
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  • 7
    Online Resource
    Online Resource
    Optimization of drying ammonium tetramolybdate by microwave heating using response surface methodology
    Walter de Gruyter GmbH ; 2016
    In:  Green Processing and Synthesis Vol. 5, No. 1 ( 2016-1-1), p. 15-22
    Details
    In: Green Processing and Synthesis, Walter de Gruyter GmbH, Vol. 5, No. 1 ( 2016-1-1), p. 15-22
    Abstract: The process of microwave drying ammonium tetramolybdate is studied, and the process variables of drying time, drying temperature and material thickness are considered. Experiences of microwave drying ammonium tetramolybdate have been optimized using response surface methodology (RSM) technique and a CCD design. Effects of each factor and their interactions are researched, and a quadratic polynomial model for dehydration ratio is established. As can be seen from the ANOVA, the effects of the three process variables are found to be significant in the model, and the empirical model is fit and reliable to check the dehydration ratio of ammonium tetramolybdate. The optimum conditions for drying using microwave heating are found as follows: drying temperature 67°C, drying time 9.5 min and material thickness 15 mm. The optimum dehydration ratio is 79.82% and the last molybdenum content is not 〈 56.3%, with the relatively error of 0.64%, which indicates the success of the process optimization experiments. This research has important significance to offer optimum conditions for industrial production.
    Type of Medium: Online Resource
    ISSN: 2191-9550 , 2191-9542
    URL: Article
    DOI: 10.1515/gps-2015-0077
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2016
    detail.hit.zdb_id: 2645923-1
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  • 8
    Online Resource
    Online Resource
    Kinetics analysis of the forward extraction of cerium(III) by D2EHPA from chloride medium in the presence of two complexing agents using a constant interfacial area cell with laminar flow
    Walter de Gruyter GmbH ; 2018
    In:  Green Processing and Synthesis Vol. 7, No. 4 ( 2018-07-26), p. 380-386
    Details
    In: Green Processing and Synthesis, Walter de Gruyter GmbH, Vol. 7, No. 4 ( 2018-07-26), p. 380-386
    Abstract: The kinetic studies performed on the forward extract of cerium(III) from chloride solution with the complex agents, citric acid (H 3 Cit) and lactic acid (HLac) in the presence of di-(2-ethylhexyl)phosphoric acid (D2EHPA, H 2 A 2 ) have been investigated using a constant interfacial area cell with laminar flow. The effects of stirring speed, temperature, and specific interfacial area on the extraction rate are discussed separately, and the results show that the extraction process is a diffusion-controlled kinetics process with an interfacial reaction. Studies on the effect of pH value and H 2 A 2 concentration on the extraction rate are used to obtain the rate equation. The rate-controlling step is also suggested by the predictions derived from the interfacial reaction models, and the rate equation obtained by the kinetic model is consistent with that obtained by the experimental results. The information on the extraction kinetics in this extraction system will provide some knowledge of its application.
    Type of Medium: Online Resource
    ISSN: 2191-9550 , 2191-9542
    URL: Article
    DOI: 10.1515/gps-2017-0035
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2018
    detail.hit.zdb_id: 2645923-1
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  • 9
    Online Resource
    Online Resource
    Ammonia Leaching of Zinc from Low-grade Oxide Zinc Ores Using the Enhancement of the Microwave Irradiation
    Walter de Gruyter GmbH ; 2018
    In:  International Journal of Chemical Reactor Engineering Vol. 16, No. 3 ( 2018-3-26)
    Details
    In: International Journal of Chemical Reactor Engineering, Walter de Gruyter GmbH, Vol. 16, No. 3 ( 2018-3-26)
    Abstract: Irradiated roast treatment and the ammonia leaching processing were conducted to deal with the low-grade oxide zinc ores. The ZnCO 3 phase was hard to be attended, which was the reason for the low leaching rate of the complicated zinc ores. The mineral phase transformation of the ZnCO 3 phase was generated after the ores irradiated in the microwave at the temperature of 673 K. The irradiated ores generated more small particles, it was the reason that the leaching rate of the complicated zinc ores was increased. When the leaching processing of the irradiated roasted ores was conducted under the conditions of the total ammonia concentration of 6 mol/L, the liquid to solid phase ratio of 11:1, the leaching temperature of 298 K, the leaching time of 150 min and the stirring speed of 400 rpm, 88.3 % of zinc could be achieved, which was the maximum leaching rate of the irradiated ores.
    Type of Medium: Online Resource
    ISSN: 1542-6580 , 2194-5748
    URL: Article
    DOI: 10.1515/ijcre-2017-0055
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2018
    detail.hit.zdb_id: 2112754-2
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  • 10
    Online Resource
    Online Resource
    A new method of flow blockage collapsing in the horizontal pipe: the pipe-rotation mechanism
    Walter de Gruyter GmbH ; 2020
    In:  International Journal of Chemical Reactor Engineering Vol. 18, No. 8 ( 2020-08-24)
    Details
    In: International Journal of Chemical Reactor Engineering, Walter de Gruyter GmbH, Vol. 18, No. 8 ( 2020-08-24)
    Abstract: In dense pneumatic conveying, flow blockage is a severe problem in the horizontal pipe, so accelerating the collapse velocity of blockage can improve the efficiency of powder transportation. In this paper, we offered a new method of the pipe-rotation mechanism and focused on the effect of this method on blockage collapse from collapse velocity, mass flow rate, and the change of the particle region. The physical model developed is horizontal pipe-rotation geometry at a uniform rotational speed of 0, 150, 300, 450, and 600 rpm, respectively. Then we used a computational fluid dynamics and discrete element method (CFD-DEM) model to investigate a single slug of particles passing through these geometries. The results show that collapse velocity and the mass flow rate increase with increasing rotational speed, which proves that the pipe-rotation mechanism can accelerate the collapse of flow blockage evidently. Moreover, the pipe-rotation mechanism changes the particle region significantly, which is polarized in the lower half of the pipe. It is trusted that the findings reported in this paper well serve as a helping source for further studies toward dense pneumatic conveying.
    Type of Medium: Online Resource
    ISSN: 1542-6580 , 2194-5748
    URL: Article
    DOI: 10.1515/ijcre-2020-0073
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2020
    detail.hit.zdb_id: 2112754-2
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