799 research outputs found
FIGURE 1 in A review of the subfamily Centrocneminae (Hemiptera: Heteroptera: Reduviidae) from Sumatra
No full textFIGURE 1. Neocentrocnemis signoreti (Stål), 3. Habitus. Scale bar = 3.47 mm.Published as part of Li, Hu, Yan, Keyu, Constant, Jerome & Cai, Wanzhi, 2009, A review of the subfamily Centrocneminae (Hemiptera: Heteroptera: Reduviidae) from Sumatra, pp. 24-32 in Zootaxa 2166 on page 26, DOI: 10.5281/zenodo.18909
FIGURE 22 in A review of the subfamily Centrocneminae (Hemiptera: Heteroptera: Reduviidae) from Sumatra
No full textFIGURE 22. The distribution of Neocentrocnemis signoreti (Stål) () and Centrocnemoides sumatrana Miller ().Published as part of Li, Hu, Yan, Keyu, Constant, Jerome & Cai, Wanzhi, 2009, A review of the subfamily Centrocneminae (Hemiptera: Heteroptera: Reduviidae) from Sumatra, pp. 24-32 in Zootaxa 2166 on page 31, DOI: 10.5281/zenodo.18909
Research on code division multiple access based on chirp multi-carrier
No full textUnderwater acoustic (UWA) channels are characterized by narrow-band, time-varying, and strong multipath interference. At the same time, Doppler effect also has a significant impact in UWA communications due to low sound speed in water. Therefore, traditional wireless multiple access technology cannot be used directly underwater. However, by combining some existing technologies in underwater communications, the traditional multiple access method can be improved to enable underwater multiple access. In this paper, we introduced chirp signals as carriers, which is widely used in UWA communications. Combined with code division multiple access (CDMA) and orthogonal frequency division multiple access (OFDMA) techniques, a multi-carrier chirp signal based CDMA method is proposed, which improves the reliability and spectrum efficiency of underwater multiple access. The simulation results show that the proposed method has good Bit error rate (BER) performance. Further, the method is also able to achieve good BER performance under the influence of Doppler effect because chirp signals is capable of resisting Doppler effects.</p
FIGURES 14–21. Centrocnemoides sumatrana Miller, 3. 14 in A review of the subfamily Centrocneminae (Hemiptera: Heteroptera: Reduviidae) from Sumatra
No full textFIGURES 14–21. Centrocnemoides sumatrana Miller, 3. 14, Head and pronotum, antennae removed; 15, paramere; 16, forewing (abnormal); 17, phallus; 18, 19, phallosoma; 20, pygophore; 21, apical part of abdomen. 14, 17, 20, lateral view; 18, 21 ventral view; 19, dorsal view. Scale bar of 14, 16, 21 = 1.25 mm; of 20 = 0.63 mm; of 15, 17–19 = 0.42 mm.Published as part of Li, Hu, Yan, Keyu, Constant, Jerome & Cai, Wanzhi, 2009, A review of the subfamily Centrocneminae (Hemiptera: Heteroptera: Reduviidae) from Sumatra, pp. 24-32 in Zootaxa 2166 on page 30, DOI: 10.5281/zenodo.18909
Coaxial MoS2@Carbon Hybrid Fibers: A Low-Cost Anode Material for High-Performance Li-Ion Batteries
No full textPublisher's PDFA low-cost bio-mass-derived carbon substrate has been employed to synthesize MoS2@carbon composites through a hydrothermal method. Carbon fibers derived from natural cotton provide a three-dimensional and open framework for the uniform growth of MoS2 nanosheets, thus hierarchically constructing coaxial architecture. The unique structure could synergistically benefit fast Li-ion and electron transport from the conductive carbon scaffold and porous MoS2 nanostructures. As a result, the MoS2@carbon composites—when serving as anodes for Li-ion batteries—exhibit a high reversible specific capacity of 820 mAh·g−1, high-rate capability (457 mAh·g−1 at 2 A·g−1), and excellent cycling stability. The use of bio-mass-derived carbon makes the MoS2@carbon composites low-cost and promising anode materials for high-performance Li-ion batteries.University of Delaware. Department of Mechanical Engineering
mixture treatment
No full textTo acquire a material with simultaneous oil–water emulsion demulsification and oil-absorbing performance, SiO
2 nanoparticles were introduced into the acrylate polymerization system to prepare oil absorbent SiO
2/P (SMA-co-MMA-co-BA) (PSA-SiO
2). PSA-SiO
2 was synthesized from monomers and functional materials, including methyl methacrylate (MMA), butyl acrylate (BA), octadecyl methacrylate (SMA) and SiO
2 hydrophobically modified by vinyltrimethoxysilane. The molecular structure of PSA-SiO
2 was characterized by FT-IR, and its morphology was observed using scanning electron microscopy. In addition, the optimal synthesis conditions for the polymerization system, such as the monomer ratio, the amount of crosslinker and stabilizer and then the particle size and dose of SiO
2, were discussed in detail. PSA-SiO
2 had a decent oil absorbency for pure halogenated and aromatic hydrocarbons (49.10, 56.41, 47.32, 43.45, 36.22, and 30.14 g/g for CH
2Cl
2, CHCl
3, CCl
4, C
2Cl
4, toluene and styrene, respectively). Furthermore, SiO
2, as a functional material, makes composites that possess excellent demulsification properties for oil-in-water emulsions. The oil removal efficiency of CHCl
3 in Tween 80-stabilized and CTAB-stabilized emulsions were 94.88% and 98.11%, respectively. All results indicated that PSA-SiO
2 had valuable potential for oil removal and emulsion treatment. Highlights: An organic–inorganic composite was synthesized by suspension polymerization. The composite was applied for absorbing pure oil or removing oil form water. By modification, the composite acquired the demulsification ability. The composite accomplished one-step demulsification and emulsion treatment. The oil absorption and emulsion treatment could achieve at room temperature.</p
Evolution and Reformation of Sport Governance in China
No full textThis chapter analyzes the evolution and reformation of sport governance in China since modern sport was introduced to China in the late nineteenth century, in order to understand how China’s sport and sport governance came into being, with the methodologies including the literature study method, historical research method and analysis method. Academic literatures on sport in China indicate that many complicated elements help to shape sport governance in China, because sport in China cannot be totally independent ofthe government. It has been a tool of Chinese governments and theirleadersin order to achieve their political goals, and therefore it has not been fully run for the “proper functioning of the market economy” (Hoye and Cuskelly, 2007). Thus, research on sport governance in China has to study the ideologies of different leaders in different Chinese governments, and also to investigate what political missions these leaders and their governments have assigned to sport. Historical research also shows that the globalization and modernization of Chinese society appear to be the key forces pushing the evolution, revolution and reformation forward in the development of sport and its governance. In other words, the change in sport governance in China has been proved to be highly correlated with that of Chinese society as well as its economic and political reforms. Finally, this chapter illustrates the administrative hierarchy of China’s sport, the policies in developing sports which eventually shape what sport governance looks like in China today, and a forecast of what it will look like tomorrow.No Full Tex
Identification of unknown Petri net structures from growing observation sequences
No full textThis thesis proposed an algorithm that can find optimized Petri nets from given observation sequences according to some rules of optimization. The basic idea of this algorithm is that although the length of the observation sequences can keep growing, we can think of the growing as periodic and algorithm deals with fixed observations at different time. And the algorithm developed has polynomial complexity. An segment of example code programed according to this algorithm has also been shown. Furthermore, we modify this algorithm and it can check whether a Petri net could fit the observation sequences after several steps. The modified algorithm could work in constant time. These algorithms could be used in optimization of the control systems and communication networks to simplify their structures
Temperature-Responsive Solvation of Deep Eutectic Electrolyte Enabling Mesocarbon Microbead Anode for High-Temperature Li-Ion Batteries
No full textDeep eutectic electrolytes (DEEs) provide a safe solution
for high-temperature
batteries. While promising, the DEEs/electrode interphase chemistry
and the underlying temperature mechanism remain unclear. Herein, the
DEE is formulated with succinonitrile (SCL) and lithium bis(fluorosulfonyl)
imide (LiFSI) to promote the mesocarbon microbead (MCMB) anode in
high-temperature Li-ion batteries. The temperature-sensitive mechanism
of solid electrolyte interphase (SEI) evolution on the MCMB is deciphered,
the core of which is temperature-regulated solvation chemistry. Specifically,
high temperature can result in the enhanced interaction between Li+ and FSI– anions in the solvation structure,
thus elevating the LiF content in the SEI. Due to the synergy of DEE
(featuring rapid ion conduction and thermal stability) and high-temperature
optimized interphase, MCMB/Li and LiFePO4/MCMB cells exhibit
improved cycling stability at high temperature. This work promotes
a fundamental understanding of the intrinsic relationship between
the temperature factor and SEI evolution, illuminating the future
of DEEs in high-temperature batteries
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