1,295 research outputs found
Tomicus armandii Li & Zhang (Curculionidae, Scolytinae), a new pine shoot borer from China
No full textLi, Xia, Zhang, Zhen, Wang, Hongbin, Wu, Wei, Cao, Peng, Zhang, Peiyi (2010): Tomicus armandii Li & Zhang (Curculionidae, Scolytinae), a new pine shoot borer from China. Zootaxa 2572: 57-64, DOI: 10.5281/zenodo.19743
Trichotichnus fedorenkoi Kataev & Hongbin & Wrase 2022, sp. n.
No full textTrichotichnus (s. str.) fedorenkoi sp. n. (Figs. 37, 68–73) Type material. Holotype. Male, “N-Vietnam, 40 km W of Cao Bang Phia Oac Mt. 22°36′25′′N / 105°52′08′′E / h ~ 1650–1700 m, deciduous forest, 3–11.X.2018 leg. D. Fedorenko ” (ZIN). Paratypes. Vietnam. CAO BANG: 1 female, same data as holotype (SIEE); 1 male, “N-VIETNAM, Cao Bang Prov. / vic. Tinh Tuc, Son Dong Nui / Pia Oac Nature Res., 850–1300 m, 09.–15.V.2014 / 22°37′55′′N, 105°52′98′′E / leg. A. Weigel by light” (NME). VINH PHUC: 1 male, N-Vietnam, Vinh Phuc Pr., vic. Tam Dao Town, Tam Dao NP, 700–1000 m, 21°27′N 105°38′E, 2–5.V.2013, A. Weigel leg. (NME); 1 female, Mts near Tam-Dao, 900 m, 2.XI.1962, O. Kabakov leg. (ZIN); LAO CAI: 1 female, Lao Cai Prov., near Cat Cat Vill., 2.5 km SW of Sa Pa, 22°19′37′′N 103°49′21′′E, 1400–1450 m, V. 2010, A.V. Abramov leg. (ZIN). NINH BINH: 1 female, Vietnam, N, Ninh Binh Pr., 90 km SW Hanoi, Cuc Phuong NP, primat rescue centre, 190 m, 20°14′24′′N 105°42′53′′E, at light, 25.IV.2012, A. Weigel leg. (NME). Description. Habitus as in Fig. 37. Morphological character states are as described for T. schmidti sp. n., but differing as follows. Body larger (length 8.5–9.1 mm). Dorsal microsculpture highly obliterated, meshes on head almost not recognized. Mesotarsomere 3 in male more elongate, in most specimens longer than wide. Last abdominal sternite (VII) in both sexes rounded at apex. Median lobe of aedeagus (Figs. 68–70) in lateral view slightly arcuate, with almost straight apical half; apex thin, hooked ventrally; in dorsal view median lobe comparatively wide basally, evenly narrowed apically, with terminal lamella (Fig. 68) about as wide as long, roundly narrowed at apex. Ventral side edged laterally and slightly depressed between margins. Apical orifice in dorsal position, wide apically. Internal sac with a large curved spiny patch apically, narrowed to base. . Female genitalia (Figs. 71 & 72): gonocoxite comparatively narrow in ventral view, about 0.6 times as long as gonosubcoxite, with relatively narrower base. Proportions (2 males and 3 females measured): HWmax/PWmax 0.69–0.73; HWmin/PWmax 0.52–0.57; HWmax/HWmin 1.27–1.32; PWmax/PL 1.53–1.57; PWmax/PWmin 1.21–1.28; EL/EW 1.52–1.60; EL/PL 2.92–3.19; EW/PWmax 1.27–1.33. Etymology. The species is named after our friend and colleague Dmitry Fedorenko (Moscow), an excellent carabidologist, who collected a part of the type series. Distribution (Fig. 73). Known from North Vietnam (Lao Cai, Cao Bang, Vinh Phuc and Ninh Binh provinces) where it occurs at altitudes of about 190–1700 m.Published as part of Kataev, Boris M., Hongbin, Liang & Wrase, David W., 2022, New data on carabid beetles of Trichotichnus s. str. (Coleoptera: Carabidae) of Yunnan (China) and adjacent areas, with description of six new species and two new subspecies, pp. 301-353 in Zootaxa 5159 (3) on pages 330-331, DOI: 10.11646/zootaxa.5159.3.1, http://zenodo.org/record/678166
FIGURE 4 in Tomicus armandii Li & Zhang (Curculionidae, Scolytinae), a new pine shoot borer from China
No full textFIGURE 4. Phylogenetic tree of Tomicus species obtained by neighbor joining. Bootstrap values calculated from 500 replicates are given on the node.Published as part of Li, Xia, Zhang, Zhen, Wang, Hongbin, Wu, Wei, Cao, Peng & Zhang, Peiyi, 2010, Tomicus armandii Li & Zhang (Curculionidae, Scolytinae), a new pine shoot borer from China, pp. 57-64 in Zootaxa 2572 on page 63, DOI: 10.5281/zenodo.19743
Insights into the extraction of various vanadium species by primary amine
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For the purpose of the recovery of the high-purity vanadium product in leaching solution, solvent extraction has been considered as a promising approach. However, the vanadium species varied in different concentrations and pH values in aqueous solution, thus affecting the extraction yield or the reaction product in the process. In this paper, the main species of vanadium in solutions were determined with the equilibrium constants. The extraction reactions were determined based on determined species, then the hydrogen bond association mechanism of the reaction as well as the possible structures of the vanadium complexes were proposed and discussed in detail. This study established a systematic methodology for understanding the transition metal speciation in aqueous solutions as well as the extraction reactions, and envisaged the insights into the mechanism of the transition metal solvent extraction by primary amines.</p
Pressure-driven membrane and ion exchange hybrid system for the treatment of wastewater containing sulfite and nitrite
No full textDenitrification of flue gas can generate a large amount of wastewater. Depending on the denitrification technology used, the water could contain a fair amount of sulfite and nitrite that need to be removed for water reuse or discharge. An integrated pressure-driven membrane and ion exchange (IX) process is therefore designed and tested for this purpose in this work. The process contains a combination of nanofiltration (NF), reverse osmosis (RO), and a mixed bed IX. NF was performed on a DL1812 membrane module at 2.0MPa using a simulated wastewater containing 63.0g/L Na2SO3 and 49.5g/L NaNO2. Sulfite was separated from nitrite with a retention rate of 92.0%, and its overall recovery efficiency achieved 91.09%. The recovery rate of nitrite in the permeate of NF was 71.06%, which was further elevated by RO using a SG1812 membrane module. A four-pass RO process was shown to be capable of recovering 98.15% of NaNO2 in the final retention. Finally, it was demonstrated that followed by IX treatment, sulfite and nitrite were successfully removed to meet the water surface discharge criteria, proving the feasibility of the hybrid NF-RO-IX system as a viable alternative for treating and reusing denitrification wastewater
Determination and modeling for the solubility of Na2MoO4 center dot 2H(2)O in the (Na+ + MoO42- + SO42-) system
No full textThe solubility of Na2MoO4 center dot 2H(2)O in ( Na+ + MoO42 + SO42) system was carried out using a dynamic method within the temperature range from 293.15 K to 343.15 K. The new model was established via regression of the published and the determined values to predict the solubility. From the results, the solubility of sodium molybdate increases with the temperature increase, however, it decreases with the increasing concentration of sodium sulfate. The Pitzer parameters and the solubility product constant of sodium sulfate and sodium molybdate in aqueous solution were obtained using the literature data. The solubilities of the sodium molybdate in the sodium sulfate solution as well as the thermodynamic parameters were calculated based on the experimental values obtained. The new model was also applied to estimate the solubility of the sodium molybdate under various conditions. The calculated values agree well with the experiment results. (C) 2015 Published by Elsevier Ltd
A novel microbial electrolysis cell (MEC) reactor for biological sulfate-rich wastewater treatment using intermittent supply of electric field
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Microbial electrolysis cells (MEC), coupled with sulfate-reducing bacteria (SRB), was used to degrade sulfate-rich wastewater that is deficient in electron donors. However, because of the impact of electric double layers (EDLs), salt crystals formed on the electrode, thereby potentially retarding the continuity of sulfate removal during the whole operation. Here, an improved MEC reactor using intermittent electric field was established. It works better in sulfate removal for a longer period, which was higher than the conventional MEC reactor by 2.18-fold after 10 days. Observation on the activity of lactic dehydrogenase (LDH) and ATP revealed that the formation of salt crystals on the electrode led to plasmatorrhexis. Conversely, improved reactor contributed to extracellular substances production and prevented the salt crystal formation, which was conducive to biofilm formation as further verified by detection through SEM. Electrochemical impedance spectroscopy tests showed that the cathodic microorganisms accelerated electron transfer whereas the salt crystals increased the charge transfer resistance. High-throughput sequencing analysis illustrated that improved reactor could maintain the competitiveness of SRB in the microbial community for a longer period. Moreover, the improved reactor resulted in high species diversity, thereby showing the significant resistance of the microorganisms to arduous environments. (C) 2017 Elsevier B.V. All rights reserved.</p
Characterization of anion exchange membrane modified by electrodeposition of polyelectrolyte containing different functional groups
No full textIn the paper a homogeneous anion exchange membrane was modified by electrodeposition of the polyelectrolyte containing different functional groups such as poly(sodium 4-styrene sulfonate) (PSS), poly(vinylsulfonic acid, sodium salt) (PVS) and poly(sodium acrylate) (PAAS), respectively, to improve its antifouling performance in electrodialysis. The surface morphology and electrical resistance of modified membranes were nearly no obvious changes, but their contact angles all increased by 10 degrees. The zeta potential results indicated that the polyelectrolyte PVS with sulfonic group but without benzene ring was more favorable to increase the negative charge density of modified membrane. After fouling experiments for sodium dodecylbenzene sulfonate (SDBS), the contact angle and SEM analyses indicated that the antifouling performance of all the modified membranes was significantly enhanced; moreover, PVS was the most suitable for improving the antifouling performance of anion exchange membrane among the polyelectrolytes. The effect of various functional groups contained in different polyelectrolytes on the antifouling performance of modified membranes was analyzed further to reveal the antifouling mechanism of modified membranes for SDBS. It was also confirmed that the negative effect of the polyelectrolyte layer electrodeposited on the membrane surface on electrodialysis performance could be ignored by measuring the conductivity change of the dilute solution. (C) 2016 Elsevier B.V. All rights reserved
Measurement and Modeling of the Solubility of NH4VO3 in the Na2HPO4-H2O and (NH4)(2)HPO4-H2O Systems
No full textThe solubilities of ammonium metavanadate (NH4VO3) in (NH4)(2)HPO4-H2O and Na2HPO4-H2O systems were measured in the temperature range from 298.15 to 338.15 K by the isothermal dissolution method. The experimental data indicate that the solubility of NH4VO3 increases with the addition of Na2HPO4, while it first decreases and then increases with the addition of (NH4)(2)HPO4. The common ion effect and chemical equilibrium were used to explain the solubility tendencies. Two models, the Bromley-Zemaitis model and Pitzer model, were selected to correlate the solubilities of NH4VO3 in the above systems. The parameters of the new model referring to four ion-ion pairs and one ion-molecule pair were obtained via the regression of the experimental data, and the results agreed well with the experimental values. The new chemical model was then applied to analyze the main vanadium-bearing species distribution in the systems mentioned above. All of this work will develop the thermodynamics for an industrial application in the precipitation of NH4VO3
Integrated electrospun carbon nanofibers with vanadium and single-walled carbon nanotubes through covalent bonds for high-performance supercapacitors
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We report a ternary composite vanadium/single-walled carbon nanotubes (SWCNTs)/carbon nanofibers (VSCNFs) material using hybrid-electrospinning and carbonizing of polyacrylonitrile, polyvinylpyrrolidone, SWCNTs and vanadyl acetylacetonate. The morphology and structure of the ternary composites are characterized. Its electrochemical properties are measured in a 6 mol L-1 aqueous KOH electrolyte. VSCNFs possesses a hierarchical structure with micropores and mesopores and a specific surface area of 821 m(2) g(-1), and it also exhibits a reversible specific capacitance of 479 F g(-1) A g(-1) and 367.4 F g(-1) at 10 A g(-1), and retains 94% of its initial capacitance after 5000 cycles (8 A g(-1)). The results show that simultaneously adding vanadium and SWCNTs can greatly enhance the conductivity, capacitive performance and stability by forming a closer connection with nanofibers through V-N-C, V-O-C and V=O bonds. SWNCTs are not only mechanically mixed in CNFs to enhance the extent of graphitization, but also involved in the transmutation process of CNFs graphitization with the participation of vanadium.</p
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