199,252 research outputs found
Modeling termination kinetics of non-stationary free-radical polymerizations
No full textPulsed-laser induced polymerization is modeled via an approach presented in a previous paper. An equation for the time dependence of free-radical concentration is derived. It is shown that the termination rate coefficient may vary significantly as a function of time after applying the laser pulse despite of the fact that the change in monomer concentration during one experiment is negligible. For the limiting case of t ≫ c-1 (kpM)-1, where c is a dimensionless chain-transfer constant, kp the propagation rate coefficient and M the monomer concentration, an analytical expression for kt is derived. It is also shown that time-resolved single pulsed-laser polymerization (SP-PLP) experiments can yield the parameters that allow the modeling of kt in quasi-stationary polymerization. The influence of inhibitors is also considered. The conditions are analyzed under which M (t) curves recorded at different extents of laser-induced photo-initiator decomposition intersect. It is shown that such type of behavior is associated with chain-length dependence of kt
Bioramix (Cardiobioramix) splendida Egorov 2006
No full textBioramix (Cardiobioramix) splendida Egorov, 2006 (Figs 49–50, 214, 361–362) Bioramix (Cardiobioramix) splendida Egorov, 2006b: 789; 2008: 292; 2009: 63; Bai & Ren, 2016: 193; Li et al., 2016b: 589. Material. CHINA: Sichuan: 1♀ (IZCAS), W Yajiang County, 3400 m, 15–18.VII.2001, Xiao-Dong Yu & Hong- Zhang Zhou leg.; 7♂♂, 4♀♀ (MHBU), Bajiaolou Township, Yajiang County, 3400 m, 17.VII.2008, Guo-Dong Ren et al. leg.; 38♂♂, 30♀♀ (MHBU), Gaoersi Shan, Yajiang County, 30°03.420′ N, 101°17.730′ E, 3712 m, 15.VIII.2016, Xiu-Min Li, Xing-Long Bai, Run-Yang Zhang & Xian-Lei Shao leg. Distribution. China: Sichuan (Egorov, 2006b).Published as part of Bai, Xing-Long & Ren, Guo-Dong, 2020, Revision of the genus Bioramix Bates, 1879 (Coleoptera: Tenebrionidae: Platyscelidini) from China, pp. 1-102 in Zootaxa 4815 (1) on page 18, DOI: 10.11646/zootaxa.4815.1.1, http://zenodo.org/record/394431
Platyscelis (Platyscelis) bogatshevi Egorov 1989
No full text<i>Platyscelis</i> (<i>Platyscelis</i>) <i>bogatshevi</i> Egorov, 1989 <p>(Figs. 13–14, 46)</p> <p> <i>Platyscelis</i> (<i>Oblongoplatyscelis</i>) <i>bogatshevi</i> Egorov, 1989: 341.</p> <p> <i>Platyscelis</i> (<i>Platyscelis</i>) <i>bogatshevi</i>: Egorov, 2004: 660; 2008: 296; 2009: 67; Ren & Liu, 2009: 1149 (defensive gland).</p> <p> <b>Material.</b> <b>CHINA: Gansu:</b> 1♀ (IZCAS), Wen Xian, 1000 m, 20.VII.1999, Jian Yao leg.; 9♂♂, 8♀♀ (MHBU), Wen Xian, 1000 m, 6.VII.2003, Yi-Bin Ba & Yang Yu leg.; 1♂ (MHBU), Huangtuling, Wen Xian, 2350 m, 9.VII.2003, Yi-Bin Ba & Yang Yu leg.</p> <p> <b>Distribution.</b> China: Gansu (<b>new record</b>), Sichuan (Egorov, 1989).</p>Published as part of <i>Bai, Xing-Long & Ren, Guo-Dong, 2019, Revision of the genus Platyscelis Latreille, 1818 from China (Coleoptera: Tenebrionidae: Platyscelidini), pp. 101-126 in Zootaxa 4609 (1)</i> on page 108, DOI: 10.11646/zootaxa.4609.1.4, <a href="http://zenodo.org/record/3150800">http://zenodo.org/record/3150800</a>
Bioramix (Leipopleura) nyainrongensis Li & Egorov 2016
No full textBioramix (Leipopleura) nyainrongensis Li & Egorov, 2016 (Figs 104–105, 261–262, 345, 379–380) Bioramix (Leipopleura) nyainrongensis Li & Egorov in Li et al., 2016a: 33. Type material. Holotype: ♂ (MCWNU), 2010-VIII-6, Nyainrong County, Xizang, 4728m, Yun-Chun Li & Yong- Sheng Pan leg., Museum of China West Normal University // HOLOTYPE // ramix (Leipopleura) nyainrongensis Li & Egorov,Li et al. 2, Type specimen, Det. Yun-Chun Li & L. Egorov, Museum of China West Normal University (Figs 261, 345). Paratypes: 2♂♂, 2♀♀ (MCWNU), 2010-VIII-6, Nyainrong County, Xizang, 4728m, Yun-Chun Li & Yong-Sheng Pan leg., Museum of China West Normal University // PARATYPE. Other material. CHINA: Qinghai: 6♂♂ (MHBU), Yanshiping, [Tanggulashan Town], Golmud City, 33°33.805′ N, 92°03.354′ E, 4719 m, 13.VIII.2011, Guo-Dong Ren et al. leg. Xizang: 164♂♂, 92♀♀ (MHBU), 109 Daoban, Mt. Tanggula, [Amdo County], 32.7948° N, 91.9049° E, 5018 m, 6.VIII.2009, Guo-Dong Ren, Yi-Bin Ba & Yong Zhou leg.; 11♂♂, 7♀♀ (MHBU), Kangrong Village, Xagqu Township, Nyainrong County, 32°11.736′ N, 92°32.791′ E, 4833 m, 19.VIII.2018, Xing-Long Bai, Zi-Yuan Hu & Ming-Min Ma leg.; 18♂♂, 7♀♀ (MHBU), Charong Village, Nyainrong Town, Nyainrong County, 32°09.924′ N, 92°14.406′ E, 4618 m, 19.VIII.2018, Xing- Long Bai, Zi-Yuan Hu & Ming-Min Ma leg. Distribution. China: Qinghai (new record), Xizang (Li et al., 2016a).Published as part of Bai, Xing-Long & Ren, Guo-Dong, 2020, Revision of the genus Bioramix Bates, 1879 (Coleoptera: Tenebrionidae: Platyscelidini) from China, pp. 1-102 in Zootaxa 4815 (1) on page 42, DOI: 10.11646/zootaxa.4815.1.1, http://zenodo.org/record/394431
Robust stabilization of relative equilibria with application to a heavy top
No full textPosbergh, T.; Egorov, M.. (1998). Robust stabilization of relative equilibria with application to a heavy top. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/3264
Modeling the effects of primary radicals in free-radical polymerization
No full textThe effects of non-ideal initiator decomposition, i.e., decomposition into two primary radicals of different reactivity toward the monomer, and of primary radical termination, on the kinetics of steady-state free-radical polymerization are considered. Analytical expressions for the exponent n in the power-law dependence of polymerization rate on initiation rate are derived for these two situations. Theory predicts that n should be below the classical value of 1/2. In the case of non-ideal initiator decomposition, n decreases with the size of the dimensionless parameter alpha drop (k(tz)/k(dz))rootr(in)/k(t), where k(tz) is the termination rate coefficient for the reaction of a non-propagating primary radical with a macroradical, k(dz) is the first-order decomposition rate coefficient of non-propagating (passive) radicals, r(in) is initiation rate, and k(t) is the termination rate coefficient of two active radicals. In the case of primary radical termination, n decreases with the M 1/2 size of the dimensionless parameter beta drop k(l,s) r(in)(1/2)/k(p,s)Mk(t,l)(1/2), where k(t,s) is the termination rate coeificients for the reaction of a primary ("shorf") radical with a macroradical, k(t,l) is the termination rate coefficients of two large radicals, k(p,s) is the propagation rate coefficient of primary radicals and M is monomer concentration. As k(t) is deduced from coupled parameters such as k(l)/k(p), the dependence of k(p) on chain length is also briefly discussed. This dependence is particularly pronounced at small chain lengths. Moreover, effects of chain transfer to monomer on n are discussed
Bioramix (Leipopleura) igori Li & Egorov 2013
No full textBioramix (Leipopleura) igori Li & Egorov, 2013 (Figs 78–79, 238–239, 339, 365) Bioramix (Leipopleura) igori Li & Egorov in Li et al., 2013: 90; Li et al., 2016a: 39. Type material. Holotype: ♂ (MCWNU), 2010-VII-21, Qamdo City, Xizang, 3506m, Ai-Min Shi & Yong-Sheng Pan leg., Museum of China West Normal University // HOLOTYPE // Bioramix (Leipopleura) igori Li et L. Egorov,2013, Type specimen, Det. Yun-Chun Li & L. Egorov, Museum of China West Normal University (Figs 238, 339). Paratypes: 61♂♂, 42♀♀ (MCWNU), 2010-VII-21, Qamdo City, Xizang, 3506m, Ai-Min Shi & Yong-Sheng Pan leg., Museum of China West Normal University // PARATYPE. Other material. CHINA: Qinghai: 1♀ (MHBU), Nangqên County, 27–29.VI.2014, Zhi-Jun Zhou leg.; 53♂♂, 38♀♀ (MHBU), Dongcaixi Village, Xiangda Town, Nangqên County, 32°15.412′ N, 96°20.254′ E, 3960 m, 26.VII.2019, Guo-Dong Ren, Xing-Long Bai, Ya-Lin Li, Ming-Min Ma & He Shi leg.; 6♂♂, 1♀ (MHBU), Eya La Yakou, Nangqên County, 31°55.916′ N, 96°28.051′ E, 4432 m, 27.VII.2019, Guo-Dong Ren, Xing-Long Bai, Ya-Lin Li, Ming-Min Ma & He Shi leg. Xizang: 1♂, 1♀ (MHBU), Qamdo City, 22.VIII.1973, Ji-Jun Li leg., coll. IZCAS; 1♀ (IZCAS), Qamdo City, 22.VIII.1973, Ji-Jun Li leg.; 1♂ (IZCAS), Qamdo City, 31.11° N, 90.02° E, 3300 m, 15.VIII.2001, Jun Chen leg.; 6♂♂ (MCWNU), Qamdo City, 31.VII.2010, Ai-Min Shi & Yong-Sheng Pan leg.; 8♂♂ (MCWNU), Qamdo City, 7.VI.2004, Ai-Min Shi & Yi-Bin Ba leg., coll. MHBU; 59♂♂, 29♀♀ (MHBU), Gari Village, Cêrwai Township, Qamdo City, 31°29.523′ N, 97°13.723′ E, 3403 m, 23.VIII.2018, Xing-Long Bai, Zi-Yuan Hu & Ming-Min Ma leg. Distribution. China: Qinghai (new record), Xizang (Li et al., 2013).Published as part of Bai, Xing-Long & Ren, Guo-Dong, 2020, Revision of the genus Bioramix Bates, 1879 (Coleoptera: Tenebrionidae: Platyscelidini) from China, pp. 1-102 in Zootaxa 4815 (1) on page 29, DOI: 10.11646/zootaxa.4815.1.1, http://zenodo.org/record/394431
Bioramix (Leipopleura) hongyuanensis Li & Egorov 2013
No full textBioramix (Leipopleura) hongyuanensis Li & Egorov, 2013 (Figs 76–77, 236–237, 338) Bioramix (Leipopleura) hongyuanensis Li & Egorov in Li et al., 2013: 90; Li et al., 2016a: 39; Egorov, 2019: 981. Type material. Holotype: ♂ (MCWNU), 2009-VII-25, Hongyuan County, Sichuan, Ai-Min Shi & Yong-Fu Wang leg., Museum of China West Normal University // HOLOTYPE (Figs 236, 338). Paratypes: 12♂♂, 13♀♀ (MC- WNU), 1♂, 1♀ (MHBU), 2009-VII-25, Hongyuan County, Sichuan, Ai-Min Shi & Yong-Fu Wang leg., Museum of China West Normal University // PARATYPE. Other material. CHINA: Qinghai: 8♂♂, 5♀♀ (MHBU), Longge, Baiyü Township, [Jigzhi County], 33.2569° N, 100.8194° E, 3897 m, 12.VII.2009, Guo-Dong Ren, Yi-Bin Ba & Yong Zhou leg. Sichuan: 3♂♂ (MHBU), Hongyuan County, 26.VII.1999, Guo-Dong Ren leg.; 12♂♂, 10♀♀ (MHBU), Shuajingsi Town, Hongyuan County, 28.VII.2009, Zhen-Hua Gao & Yi-Ping Niu leg.; 4♂♂, 5♀♀ (MHBU), Anqog Town, Hongyuan County, Aba Zhou [equivalent to City], 24.VII.2011, Guo-Dong Ren et al. leg.; 1♀ (MHBU), Hongxing Township, Zoigê County, 10.VII.2009, Guo-Dong Ren, Yi-Bin Ba & Yong Zhou leg.; 4♂♂, 4♀♀ (MHBU), Qiujima Township, Aba County, 11.VII.2009, Guo-Dong Ren, Yi-Bin Ba & Yong Zhou leg.; 1♂ (MCWNU), Anchang, An Xian, 18.VII.2009, Juan Li & Xia Yan leg. Distribution. China: Qinghai (new record), Sichuan (Li et al., 2013; Egorov, 2019).Published as part of Bai, Xing-Long & Ren, Guo-Dong, 2020, Revision of the genus Bioramix Bates, 1879 (Coleoptera: Tenebrionidae: Platyscelidini) from China, pp. 1-102 in Zootaxa 4815 (1) on page 29, DOI: 10.11646/zootaxa.4815.1.1, http://zenodo.org/record/394431
Platyscelis (Platyscelis) amdoensis Egorov 1989
No full text<i>Platyscelis</i> (<i>Platyscelis</i>) <i>amdoensis</i> Egorov, 1989 <p>(Figs. 2, 7–8, 41)</p> <p> <i>Platyscelis</i> (<i>Platyscelis</i>) <i>amdoensis</i> Egorov, 1989: 347; 2004: 661; 2008: 296; 2009: 67.</p> <p> <b>Material.</b> <b>CHINA: Gansu:</b> 3♂♂, 2♀♀ (HNHM), N.W.-China, Kansu, Minshan, Gebiet zw. Min u.Tao, VI.- VII.1948 u.49, leg. Pater Eichinger // <i>ballioni</i> Rtt., Dr Z. Kaszab det. // <i>Platyscelis ballioni</i> Reitt., det. L. Egorov 1989 [misidentification]; 1♂, 2♀♀ (MHBU), Wanmao, Jonȇ, 34°50.233′ N, 103°07.579′ E, 3130 m, 5.VIII.2012, Guo-Dong Ren <i>et al.</i> leg.</p> <p> <b>Distribution.</b> China: Gansu (Egorov, 1989).</p> <p> <b>Remarks.</b> This species was described from Amdos highland, Gansu [including Gannan and parts of Tianzhu] with three specimens (2♂♂, 1♀), posterior angles of pronotum rectangular and sharp, median depression on dorsal surface of parameres extended to base in the original description. In this study, eight specimens were examined and their posterior angles rectangular but not sharp (Fig. 2: A), median depression also not extended to base (Figs. 2: I, 7). According to the locality, body size and other diagnostic characters of these specimens are almost same as <i>P. amdoensis</i>, we regarded them as variability of this species.</p>Published as part of <i>Bai, Xing-Long & Ren, Guo-Dong, 2019, Revision of the genus Platyscelis Latreille, 1818 from China (Coleoptera: Tenebrionidae: Platyscelidini), pp. 101-126 in Zootaxa 4609 (1)</i> on page 106, DOI: 10.11646/zootaxa.4609.1.4, <a href="http://zenodo.org/record/3150800">http://zenodo.org/record/3150800</a>
Bioramix (Cardiobioramix) maoxianensis Li, Egorov & Shi 2016
No full textBioramix (Cardiobioramix) maoxianensis Li, Egorov & Shi, 2016 (Figs 45–46, 211–212, 330, 360) Bioramix (Cardiobioramix) maoxianensis Li et al., 2016b: 587. Type material. Holotype: ♂ (MCWNU), 2012-VII-25, Pingtou Village, Mao Xian, Sichuan, Yun-Chun Li & Yong-Ping Lai leg., Museum of China West Normal University // HOLOTYPE // Bioramix (Cardiobioramix) maoxianensis,Li et al.2016, Type specimen, Det. Yun-Chun Li & L. Egorov, Museum of China West Normal University (Figs 211, 330). Paratypes: 7♂♂, 10♀♀ (MCWNU), 2012-VII-25, Pingtou Village, Mao Xian, Sichuan, Yun-Chun Li & Yong-Ping Lai leg., Museum of China West Normal University // PARATYPE. Other material. CHINA: Sichuan: 32♂♂, 26♀♀ (MHBU), Xiaomiao Shan, Mao Xian, 1600 m, 22.VIII.1999, Guo-Dong Ren leg.; 1♂, 1♀ (MHBU), Xiaomiao Shan, Mao Xian, 6.VIII.2019, Lu Qiu leg. [SWU]; 1♂ (MHBU), Feihong Township, Mao Xian, 31°48.950′ N, 103°43.733′ E, 1570 m, 28.VII.2016, Xiu-Min Li, Xing-Long Bai, Run-Yang Zhang & Xian-Lei Shao leg. Distribution. China: Sichuan (Li et al., 2016b).Published as part of Bai, Xing-Long & Ren, Guo-Dong, 2020, Revision of the genus Bioramix Bates, 1879 (Coleoptera: Tenebrionidae: Platyscelidini) from China, pp. 1-102 in Zootaxa 4815 (1) on page 17, DOI: 10.11646/zootaxa.4815.1.1, http://zenodo.org/record/394431
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