19 research outputs found
Actuator Fault Detection and Fault-Tolerant Control for Hexacopter
No full textIn this paper, fault detection and fault-tolerant control strategies are proposed to handle the issues of both actuator faults and disturbances in a hexacopter. A dynamic model of a hexacopter is first derived to develop a model-based fault detection system. Secondly, the altitude control based on a sliding mode and disturbance observer is presented to tackle the disturbance issue. Then, a nonlinear Thau observer is applied to estimate the states of a hexacopter and to generate the residuals. Using a fault detection unit, the motor failure is isolated to address the one or two actuator faults. Finally, experimental results are tested on a DJI F550 hexacopter platform and Pixhawk2 flight controller to verify the effectiveness of the proposed approach. Unlike previous studies, this work can integrate fault detection and fault-tolerant control design as a single unit. Moreover, the developed fault detection and fault-tolerant control method can handle up to two actuator failures in presence of disturbances
STARCH BASED MICROSPHERE BIOLASERS
No full textRecently, biolasers whose optical cavity is made of natural materials such as serum-extracted protein, egg white, cellulose, and gelatin have attracted a lot of attention. The advantage of these lasers is their biocompatibility and biodegradability which is significant for biointegration. In this study, we demonstrate that starch is a low-cost and good material for microsphere biolasers. By using a simple emulsion method with a dehydration process, dye-doped starch microsphere lasers with diameters ranging from 40 to 180 μm have been successfully obtained. Lasing properties are investigated and the results show that the lasing threshold is approximately 1.0 μJ and the quality factor can reach 2700. The starch-based microsphere lasers indicate excellent stability after a storage time of a month; thus, they are promising for practical applications in biological and chemical sensors
FABRICATION OF METHYLAMMONIUM TIN IODIDE SUBMICRON CUBICS ON A SnO2 NANOWIRE BY CHEMICAL VAPOUR DEPOSITION METHOD
No full textIn this work, we have successfully synthesized cubic MASnI3 halide-perovskite on a SnO2 nanowire through two-step process using a chemical vapour deposition (CVD) system. First, SnO2 nanowires with diameter in the range of 15 to 50 nm were fabricated via thermal oxidation process with Au catalyst at 800ºC. A SnO2 nanowire was used as a template for the growth of MASnI3 cubics in the second step. The obtained products were characterized by X-ray diffraction (XRD), field-emission electron scanning microscopy (FE-SEM), and high-resolution transmission electron microscopy (HR-TEM). Finally, the formation mechanism of the MASnI3/SnO2 hybrid was discussed in detail
GROWTH AND STRUCTURE OF SnO/ZnO BIAXIAL NANOWIRES ON ZnO NANOWIRE BY VAPOR-LIQUID-SOLID MECHANISM
No full textIn this work, the biaxial SnO/ZnO nanowires in the average length of 5 μm, have been successfully synthesized on a ZnO-nanowire substrate using a chemical vapor deposition (CVD) system through a two-step process. First, ZnO nanowires were grown directly on the glass substrate with a gold catalyst. Then, these nanowires were used as templates for the growth of biaxial SnO/ZnO nanowires without any catalyst. The obtained products were characterized by X-ray diffraction (XRD), field-emission electron scanning microscopy (FE-SEM), and high-resolution transmission electron microscopy (HR-TEM). The Sn-Zn alloy formulated during the process was believed a catalyst for the growth of the biaxial SnO/ZnO nanowires. The biaxial structure was formed due to simultaneous growth of SnO and ZnO nanowire along the direction of SnO [110] and ZnO [002], respectively. A possible growth mechanism of the biaxial SnO/ZnO nanowire was discussed based on the vapor-liquid-solid (VLS) mechanism. The as-synthesized structure could be a good candidate for nano-sensors
Metrocoris acutus Chen & Nieser 1993
No full text<i>Metrocoris acutus</i> Chen & Nieser, 1993 <p>(Figs. 14, 15, 37, 74–76)</p> <p> <i>Metrocoris acutus</i> Chen & Nieser, 1993: 32–33, Figs, 88, 95–96, 101–102 (type locality: Konthanthan, Chiang Mai, Thailand); Zettel & Chen, 1996: 152, 176–177 (records from Vietnam).</p> <p> <b>Material examined.</b> VIETNAM: <b>Dien Bien Prov.:</b> 1 female (apt), 3 males (mpt), Na Tau, Nam Rom river, coll. Tran A.D., 25 July 2004, DY0412 (ZRC); 2 males, 4 females (apt), 1 male, 2 females (mpt), Muong Phang, Muong Phang stream, coll. Tran A.D., 26 July 2004, DY0415 (ZRC); 5 males, 5 females (apt), 1 male, 2 females (mpt), Dien Bien Dong, Keo Lom, Huoi stream, coll. Tran A.D., 27 July 2004, DY0417 (ZRC). <b>Lai Chau Prov.:</b> 2 males (mpt), Tam Duong, Ho Thau, stream at Su Thang brigde, km 9 Nat. Road #4D, coll. Tran A.D. et al., 31 May 2013, TAD1324 (ZMHU); 1 female (apt), Muong Te, Nam Khao, Nam Puc, stream by the road from Muong Te town to Pac Ma, ca. 17 km from Muong Te town, coll. Tran A.D. et al., 2 June 2013, TAD1325 (ZMHU); 1 male, 1 female (mpt), Muong Te, Nam Khao, Huoi Dang stream, by the road from Muong Te town to Pac Ma, ca. 21 km from Muong Te town, coll. Tran A.D. et al., 2 June 2013, TAD1326 (ZMHU); 1 male, 5 females (apt), 1 male, 1 female (mpt), Muong Te, Bum Nua, Huoi Hon stream, by the road from Muong Te town to Pa Tan, ca. 10 km from Muong Te town, coll. Tran A.D. et al., 2 June 2013, TAD1327 (ZMHU); 1 male (apt), 2 males, 1 female (mpt), Muong Te, Bum Nua, a stream by the road from Muong Te town to Pa Tan, ca. 13 km from Muong Te town, coll. Tran A.D. et al., 2 June 2013, TAD1328 (ZMHU); 2 males, 3 females (apt), 3 males (mpt), Muong Te, Muong Mo stream, by the road from Muong Te town to Lai Ha, ca. 33 km from Muong Te town, coll. Tran A.D. et al., 3 June 2013, TAD1329 (ZMHU); 2 males (mpt), Muong Te, Muong Mo, Ban 41 stream, by the road from Muong Te town to Lai Ha, ca. 45 km from Muong Te town, coll. Tran A.D. et al., 3 June 2013, TAD1330 (ZMHU); 3 males, 3 females (apt), Nam Na River and Nam Ceung stream trib., 15.5 km N. of Lai Chau, 200 m asl, 22°08′52″N, 103°11′33″E, water temp. 21.5°C (trib.), 11 April 2000, 1000–1300 hrs., CL 4409, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen (USNM, BPBM); 5 females (apt), 1 male, 1 female (mpt), cascading stream 12 km N. of Lai Chau, 290 m asl, 22°07′19″N, 103°11′30″E, water temp. 22°C, 11 April 2000, 1345–1600 hrs., CL 4410, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen (USNM, BPBM). <b>Lao Cai Prov.:</b> 2 males, 5 females (apt), 1 female (mpt), Sa Pa, Trung Chai, km 119 Nat. Road #4D, Mong Sen stream, coll. Dinh N.H. et al., 25 April 2011, DNH11.15 (ZMHU); 2 males, 6 females (mpt), Sa Pa, Nam Cang, Nam Cang stream, coll. Dinh N.H. et al., 23 October 2012, DNH12.08 (ZMHU); 1 male, 1 female (apt), Sa Pa, Nam Sai, Seo Nam Sai stream 1, coll. Dinh N.H. et al., 24 October 2012, DNH12.09 (ZMHU); 1 male, 1 female (mpt), Sa Pa, Nam Sai, Seo Nam Sai stream 2, coll. Dinh N.H. et al., 24 October 2012, DNH12.10 (ZMHU); 2 males (apt), 1 female (mpt), Sa Pa, Thanh Phu, Nam Cang stream, coll. Tran A.D. et al., 26 October 2013, TAD1359 (ZMHU); 2 males (apt), Sa Pa, Thanh Phu, near junction of Nam Cang and Muong Hoa streams, coll. Ngo Q.H., 26 October 2013, TAD1360 (ZMHU); 1 male (apt), 1 female (mpt), Sa Pa, Ban Ho, Nam Pu stream (feeder stream of Muong Hoa stream), site 1, at lower section, coll. Tran A.D. et al., 26 October 2013, TAD1361 (ZMHU); 3 males, 4 females (apt), 1 female (mpt), Sa Pa, Trung Chai, km 119 Nat. Road #4D, coll. Ngo Q.H. et al., 28 October 2013, TAD1370 (ZMHU); 7 males, 7 females (apt), 4 females (mpt), rocky river and small trib., 16 km NE. of Sa Pa on Lao Cai road, 850 m asl, 22°24′52″N, 103°53′51″E, water temp. 19°C (main river), 7 April 2000, 1115–1400 hrs.; 9 April 2000, 1500–1600 hrs., CL 4397, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen (USNM, BPBM); 12 males, 12 females (apt), 1 female (mpt), small rocky stream 19 km NE. of Sa Pa on Lao Cai road, 595 m asl, 22°25′39″N, 103°55′00″E, water temp. 20°C, 7 April 2000, 1515–1600 hrs., CL 4399, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen (USNM, BPBM); 4 males, 6 females (apt), 1 male (mpt), cascading stream 20 km NE. of Sa Pa on Lao Cai road, 565 m asl [1850 ft], 22°26′20″N, 103°55′36″E, water temp. 19°C, 9 April 2000, 1215–1430 hrs., CL 4406, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen (USNM, BPBM). <b>Ha Giang Prov.:</b> 1 female (apt), Bac Me, Minh Ngoc commune, small stream by Nat’ road 34 ca. 20 km to Bac Me town, coll. Tran A.D. et al., 07 May 2014, TAD1401 (ZMHU); 3 males, 5 females (apt), 1 male, 2 females (mpt), Bac Me, road 176, Minh Son commune, stream at Ban Van bridge, coll. Tran A.D. et al., 07 May 2014, TAD1403 (ZMHU); 1 female (apt), 2 males, 2 females (mpt), Vi Xuyen, Nat’ road 4C, Minh Tan commune, Nam Dieng stream, near bridge, ca. 17.5 km to Ha Giang city, coll. Tran A.D. et al., 09 May 2014, TAD1408 (ZMHU); 2 males, 5 females (apt), 2 males, 3 females (mpt), Bac Quang, km 13 road 177, Tan Lap commune, waterfall & stream, ca. 86 km to Coc Pai town, coll. Tran A.D. et al., 10 May 2014, TAD1410 (ZMHU); 1 female (apt), Hoang Su Phi, Nam Ty commune, bridge at km 34 road 177, waterfall & stream, ca. 65 km to Coc Pai, coll. Tran A.D. et al., 10 May 2014, TAD1411 (ZMHU); 1 female (apt), 3 females (mpt), Xin Man, road 178, feeder stream of Nam Yen river, near bridge ca. 2 km from Coc Pai town, coll. Tran A.D. et al., 11 May 2014, TAD1412 (ZMHU). <b>Cao Bang Prov.:</b> 3 males, 6 females (apt), Le Nin stream at Pac Bo cave, 370 m asl, 22°58′36″N, 106°03′02″E, water temp. 18°C, 22 March 2000, CL 4371, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM); 2 females (apt), Bao Lac, Dinh Phung commune, near Tung Muu, stream by the Nat’ road 34, coll. Tran A.D. et al., 20 December 2013, TAD1378 (ZMHU); 3 males, 3 females (apt), Bao Lac, Bao Toan commune, Na Roa village, Khuoi Rong stream, feeder of Gam river, coll. Tran A.D. et al., 20 December 2013, TAD1381 (ZMHU); 1 male, 10 females (apt), 1 male (mpt), Bao Lac, near Bao Lam district town, Ban Chim steram, feeder of Gam river, coll. Tran A.D. et al., 20 December 2013, TAD1382 (ZMHU). <b>Bac Kan Prov.:</b> 1 female (apt), Ba Be, Hoang Tri commune, Hoang Tri waterfall, coll. Tran, A.D. et al., 22 August 2012, TAD1218 (ZMHU); 6 males, 6 females (apt), Ba Be N’Park, streams and pools in lower Ba Be Falls area, 140 m asl, 22°27′00″N, 105°33′48″E, water temp. 20.5°C, 20 March 2000, CL 4363, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM); 2 males, 5 females (apt), Ba Be Nat. Park, spring fed stream nr. Ba Be Falls, 180 m asl, 22°27′07″N, 105°34′28″E, water temp. 19°C, 20 March 2000, CL 4365, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM); 3 males, 7 females (apt), 1 female (mpt), Ba Be Nat. Park, Na Phon river emerging from Pac Ngoi cave on W. side of Ba Be Lake, 175 m asl, 22°25′08″N, 105°46′06″E, water temp. 20.5°C, 21 March 2000, CL 4369, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM). <b>Vinh Phuc Prov.:</b> 8 males, 8 females (apt), small stream nr. entrance to Tam Dao N’Park, NW. of Hanoi, 225 m asl, 21°25′53″N, 105°36′55″E, water temp. 19°C, 19 March 2000,CL 4361, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM). <b>Quang Ninh Prov.:</b> 4 males, 2 females (apt), 1 male (mpt), Van Don, Cai Bau island, Van Yen, Cau Cao stream, coll. Tran A.D., 14 June 2003, TAD0349 (ZRC); 5 females (apt), Dong Trieu Range, tributary stream nr. Yen Tú pagoda, 165 m asl, 21°07′44″N, 106°43′39″E, water temp. 17°C, 26 March 2000, CL 4378, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM). <b>Son La Prov.:</b> 1 female (mpt), Moc Chau, 800 m asl, coll. Vásárhelyi, 25–27 May 1986, No. 96 (NHMW); 1 male (apt), Moc Chau, 850 m asl, coll. Vásárhelyi, 26 October 1986, No. 112 (NHMW). <b>Phu Tho Prov.:</b> 3 males, 5 females (apt), 2 females (mpt), Xuan Son N’Park, Lap stream, site 1, at Ngoc waterfall, coll. Tran A.D. et al., 5 June 2013, TAD1331 (ZMHU); 2 males, 1 female (apt), 1 female (mpt), Xuan Son N’Park, Lap stream, site 2, first concrete bridge from Ngoc waterfall, coll. Tran A.D. et al., 5 June 2013, TAD1332 (ZMHU); 1 male, 2 females (apt), 1 female (mpt), Xuan Son N’Park, Lap stream, site 3, second concrete bridge from Ngoc waterfall, coll. Tran A.D. et al., 5 June 2013, TAD1333 (ZMHU); 2 females (apt), Xuan Son N’Park, Kim Thuong, Tan Ong stream, site 1, at Chin Tang waterfall, coll. Tran A.D. et al., 6 June 2013, TAD1334 (ZMHU); 1 male, 2 females (apt), Xuan Son N’Park, Kim Thuong, Tan Ong stream, site 2, ca. 2 km from Chin Tang waterfall, coll. Tran A.D. et al., 6 June 2013, TAD1335 (ZMHU); 1 male (apt), Xuan Son N’Park, Kim Thuong, Tan Ong stream, site 3, ca. 4 km from Chin Tang waterfall, coll. Tran A.D. et al., 6 June 2013, TAD1336 (ZMHU); 1 male, 1 female (mpt), Xuan Son N’Park, Ban Coi, Coi stream, site 1, water from underground, coll. Tran A.D. et al., 7 June 2013, TAD1337 (ZMHU); 1 male, 5 females (apt), 1 male, 1 female (mpt), Xuan Son N’Park, Kim Thuong, Tan Ong stream, site 2, ca. 2 km from Chin Tang waterfall, coll. Tran A.D. et al., 28 August 2013, TAD1341 (ZMHU); 1 male, 1 female (apt), Xuan Son N’Park, Kim Thuong, Tan Ong stream, site 3, ca. 4 km from Chin Tang waterfall, coll. Tran A.D. et al., 28 August 2013, TAD1342 (ZMHU); 5 males, 7 females (apt), Xuan Son N’Park, Dong Son, Than stream, site 1, coll. Tran A.D. et al., 29 August 2013, TAD1346 (ZMHU); 1 female (apt), Xuan Son N’Park, Dong Son, Than stream, site 2, coll. Tran A.D. et al., 29 August 2013, TAD1347 (ZMHU); 1 male, 3 females (apt), Xuan Son N’Park, Lap stream, site 1, at Ngoc waterfall, coll. Tran A.D. et al., 30 August 2013, TAD1352 (ZMHU); 1 male, 1 female (apt), Xuan Son N’Park, Lap stream, site 2, first concrete bridge from Ngoc waterfall, coll. Tran A.D. et al., 30 August 2013, TAD1353 (ZMHU); 2 males (apt), Xuan Son N’Park, Lap stream, site 3, second concrete bridge from Ngoc waterfall, coll. Tran A.D. et al., 30 August 2013, TAD1354 (ZMHU). <b>Hanoi:</b> 3 females (apt), 2 males (mpt), Ba Vi N’Park, Khanh Thuong, Bang stream, 83 m asl, coll. Ngo Q.H. et al., 17 December 2011, TAD1122 (ZMHU); 5 males, 10 females (apt), 2 females (mpt), Khanh Thuong, Mit stream, forest area, 80 m asl, coll. Ngo Q.H. et al., 17 December 2011, TAD1124 (ZMHU); 3 males, 5 females (apt), 5 females (mpt), Minh Quang, stream near by Tan Vien Pagoda, 340 m asl, coll. Ngo Q.H. et al., 17 December 2011, TAD1125 (ZMHU); 2 males (apt), Minh Quang, Cái stream, 65 m asl, coll. Ngo Q.H. et al., 17 December 2011, TAD1126 (ZMHU); 8 males, 11 females (apt), Ba Vi N’Park, Khoang Xanh, Tien stream, 95 m asl, coll. Ngo Q.H. et al., 17 December 2011, TAD1127 (ZMHU); 4 males, 2 females (apt), 3 males, 4 females (mpt), Khanh Thuong, Bang stream, 83 m asl, coll. Ngo Q.H. & Tran A.D., 26 April 2012, TAD1201 (ZMHU); 5 males, 6 females (apt), Khanh Thuong, Mit stream, forest area, 80 m asl, coll. Ngo Q.H. & Tran A.D., 26 April 2012, TAD1203 (ZMHU); 5 males, 10 females (apt), 1 female (mpt), Minh Quang, stream near by Tan Vien Pagoda, 340 m asl, coll. Ngo Q.H. & Tran A.D., 26 April 2012, TAD1206 (ZMHU); 1 male, 1 female (mpt), Minh Quang, Cái stream, 65 m asl, coll. Ngo Q.H. & Tran A.D., 26 April 2012, TAD1207 (ZMHU); 7 males, 1 female (apt), 3 males, 5 females (mpt), Khoang Xanh, Tien stream, 95 m asl, coll. Ngo Q.H. & Tran A.D., 27 April 2012, TAD1208 (ZMHU); 2 males (mpt), Ba Vi N’Park, stream near Coste 400, ca. 550 m asl, coll. Ngo Q.H. & Tran A.D., 27 April 2012, TAD1210 (ZMHU). <b>Hai Duong Prov.:</b> 8 males, 27 females (apt), Khe La stream, 22 km N. of Chi Linh, 160 m asl, vic. 21°13′32″N, 105°35′09″E, water temp. 18°C, 25 March 2000, CL 4375, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM). <b>Hoa Binh Prov.:</b> 1 female (apt), Hoa Binh, 100 m, coll. Vásárhelyi, 21 October 1986, No. 88 (NHMW). <b>Ninh Binh Prov.:</b> 2 males, 1 female (apt), 1 male, 1 female (mpt), Cuc Phuong, 400 m asl, coll. Vásárhelyi, 17 October 1986, No. 68 (NHMW). <b>Thanh Hoa Prov.:</b> 10 males, 17 females (apt), 1 female (mpt), Ben En N’Park, Nhu Xuan, Tan Binh, Xuan Ly ranger station, Khe Lo 4 stream, coll. Pham T.D., 26 February 2013, BE1301 (ZMHU); 2 males, 9 females (apt), Ben En N’Park, Nhu Xuan, Tan Binh, stream 300 m behind Xuan Ly ranger station, coll. Pham T.D., 26 February 2013, BE1302 (ZMHU); 2 males, 3 females (apt), Ben En N’Park, Nhu Xuan, Son Binh, Khe Cay Khe stream, site 1, coll. Pham T.D., 01 March 2013, BE1304 (ZMHU); 1 male, 4 females (apt), Ben En N’Park, Nhu Xuan, Son Binh, Khe Cay Khe stream, site 2, 300 m down-stream from site 1, coll. Pham T.D., 01 March 2013, BE1305 (ZMHU); 11 males, 14 females (apt), 1 female (mpt), Ben En N’Park, Nhu Xuan, Son Binh, Khe Trai Cao stream, coll. Pham T.D., 04 March 2013, BE1308 (ZMHU); 1 male (apt), Pu Hu Nature Reserve, Quan Hoa, Hien Chung, Ban Pheo, Pheo stream, coll. Pham T.D., March 2013, PH 1302 (ZMHU); 1 female (apt), Pu Hu Nature Reserve, Quan Hoa, Hien Chung, Ban Pheo, Ham stream, coll. Pham T.D., 09 April 2013, PH 1303 (ZMHU); 4 females (apt), 1 female (mpt), Pu Luong Nature Reserve, Ba Thuoc, Co Lung, Ban Khuyn, Khuyn stream, coll. Pham T.D., 18 March 2013, PL1303 (ZMHU). <b>Nghe An Prov.:</b> 2 males (apt), Pu Mat Nature Reserve, SW.of Con Cuong, Kem waterfall, 400 m asl, vic. 18°58′13″N, 104°48′03″E, water temp. 22°C, 1 April 2000, CL 4385, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM); 6 males, 12 females (apt), 1 male, 2 females (mpt), Bac stream, nr. Pu Mat Nature Reserve, 200 m asl, 18°59′18″N, 104°50′33″E, water temp. 24°C, 2 April 2000, CL 4388, coll. J.T. Polhemus & P. Nguyen (USNM, BPBM); 1 female (mpt), Pu Mat N’Park, Khe Kem waterfall & stream, site #1, coll. Ngo Q.H., 20 December 2012, NQH1203 (ZMHU); 2 males, 3 females (apt), Pu Mat N’Park, Khe Kem stream, site #2, ca. 300 m downstream from waterfall, coll. Ngo Q.H., 20 December 2012, NQH1204 (ZMHU); 6 males, 7 females (apt), Con Cuong, near Tung Huong, Khe Num stream, coll. Ngo Q.H., 21 December 2012, NQH1211 (ZMHU); 1 male, 3 females (apt), 1 male (mpt), Ky Son, Ta Ca, feeder stream of Loi stream, coll. Tran A.D. & Nguyen V.H., 16 April 2013, TAD1302 (ZMHU); 1 female (apt), Ky Son, Muong Xen, Ta Ca, Hoi Giang stream, coll. Tran A.D., 16 April 2013, TAD1303 (ZMHU); 2 males, 2 females (apt), 2 males (mpt), Pu Mat N’Park, Kem stream, site 2, ca. 500 m from waterfall, coll. Tran A.D. et al., 18 April 2013, TAD1311 (ZMHU); 4 females (mpt), Pu Mat N’Park, Kem stream, site 3, near visitors’ shelter, coll. Tran A.D. et al., 18 April 2013, TAD1312 (ZMHU). <b>Ha Tinh Prov.:</b> 7 males, 13 females (apt), 1 female (mpt), Vu Quang N’Park, Khe Lim waterfall, coll. Tran A.D., 24 April 2003, TAD0304 (ZRC); 5 males, 17 females (apt), 2 females (mpt), Vu Quang N’Park, a small branch of Khe Lim, coll. Tran A.D., 24 April 2003, TAD0305 (ZRC); 1 female (mpt), Vu Quang N’Park, small waterpools near Khe Lim, coll. Tran A.D., 24 April 2003, TAD0306 (ZRC); 6 males, 18 females (apt), 2 males, 4 females (mpt), Vu Quang N’Park, Song Con, old Sao La station, coll. Tran A.D., 25 April 2003, TAD0307a (ZRC); 3 males, 3 females (apt), Vu Quang N’Park, Song Con, old Sao La station, coll. Tran A.D., 25 April 2003, TAD0307b (ZRC).</p> <p> CHINA: <b>Yunnan Prov.:</b> 1 male (apt), Gejiu Pref., 10 km N Gejiu, ca. 1300 m asl, coll. Schönmann & Wang, 22 November 1999, CWBS 398 (NHMW).</p> <p> THAILAND: <b>Mae Hong Son Prov.:</b> 1 male (apt), NW. Thailand, waterfall near Mae Sariang, coll. C.M. Yang & T.B. Lim, 11 September 1998, YCM219 (ZRC); 3 females (apt), NW. Thailand, New waterfall, stream, fast flowing with boulder, coll. C.M. Yang & T.B. Lim, 7 September 1998, YCM203A (ZRC); 1 male, 1 female (apt), Pha Bong, 12 km S. Mae Hong Son, coll. H. Zettel (13a), 12 November 1995 (NHMW). <b>Chiang Mai Prov.:</b> 1 male, 1 female (apt), W. Mae Rim, Mae Sa N’Park, Mae Sa Falls, coll. H. Zettel (2), 30–31 October 1995 (NHMW). <b>Phetchabun Prov.:</b> 1 male, 1 female (apt), 36 km SE. Sila, N Ban Nam Nao, Ban Pala Yai, coll. H. Zettel (27), 25 November 1995 (NHMW).</p> <p> <b>Diagnosis.</b> Male: fore femur incrassate (ratio length/width variable, in apterous males about 2.70–4.02), with a bifid subapical tooth; fore tibia without indentation on inner surface (Figs. 74, 75). Male genitalia moderate in size: pygophore sub-ovate; proctiger elongate; paramere slender, falciform with pointed apex (Fig. 37); endosoma as in Chen & Nieser (1993: Figs. 101, 102). Female: sternum 7 large, constricted laterally, medially produced tongue-like lobe (with diagonal lateral margins) on posterior margin, sometimes directed dorsad, completely enclosing the genitalia (Fig. 76).</p> <p>Size: body length about twice as width: apterous males: length 4.60–6.30, width 2.28–3.14, macropterous males: length 6.40–8.20, width 2.34–2.97; apterous females, length 4.40–5.80, width 2.41–3.14, macropterous males: length 6.20–6.90, width 2.52–2.67.</p> <p> <b>Remarks.</b> <i>Metrocoris acutus</i> belongs to the <i>M. nigrofasciatus</i> species group, as defined by Chen & Nieser (1993), on the basis of the following character states: male fore femur incrassate, ventral surface of apical part indented with a single or bifid sub-apical tooth; paramere slender and curved; female sternum 7 large, with median lobe produced. Two species belonging to the <i>M. nigrofasciatus</i> group are found in Vietnam, <i>M. acutus</i> and <i>M. nigrofascioides</i>. Males of these two species can be separated from each other by the structures of the fore leg, parameres and endosoma. By contrast, the females of the two species are very similar to each other, especially in regard to colour pattern. However, they can be separated by size (the females of <i>M. acutus</i> are slightly larger), shape of the median lobe of sternum 7 (tongue-like in <i>M. acutus</i>, sub-rectangular in <i>M. nigrofascioides</i>), and pubescence on the inner surface of the hind trochanter (more distinct and longer in <i>M. nigrofascioides</i>).</p> <p> <b>Distribution.</b> Vietnam: Dien Bien, Son La, Quang Ninh, Hoa Binh, Ninh Binh, Ha Tinh, Cao Bang (first record), Hai Duong (first record), Thanh Hoa (first record), Nghe An (first record), Lao Cai, Lai Chau, Bac Kan, Vinh Phuc (Fig. 139). Extralimital records: China (Yunnan), Laos (Luang Prabang), Thailand (northern).</p>Published as part of <i>A. D., Tran & Polhemus, D. A., 2017, The genus Metrocoris Mayr, 1865 (Gerromorpha: Gerridae) in Vietnam, with descriptions of five new species, pp. 109-149 in Raffles Bulletin of Zoology 65</i> on pages 123-127, DOI: <a href="http://zenodo.org/record/4502634">10.5281/zenodo.4502634</a>
FABRICATION OF Cs2TeI6 FILM BY ANNEALING CsI FILM IN TeI4 VAPOUR: EFFECT OF ANNEALING TEMPERATURE
No full textHalide perovskites are now considered promising materials in the field of optoelectronic devices. Recently, the double halide-perovskite cesium tellurium iodine Cs2TeI6 has shown its potential application due to its strong stability, high absorption coefficient, suitable bandgap and composition of non-toxic elements. However, studies on its experimental fabrications are still limited. In previous works, we reported a method for fabricating Cs2TeI6 thin films by a synthesis of a CsI film followed by annealing in TeI4 vapor. Those studies focused more on application orientation rather than in-depth analysis of the influence of technical parameters on the film formation. In this study, we make CsI films by using the chemical vapor deposition method and then investigate the effect of TeI4-annealing temperature in the range of 120-330ºC on the Cs2TeI6 film formation. After that, the optical property and long-term stability are examined. At 240ºC, the film is black, tightly packed and pin-hole free with a good adhesion with the substrate. It has high absorbance in the visible region with an optical bandgap of 1.61 eV and the film is found to be very stable in humid air for 20 weeks
Metrocoris johnpolhemi A.D. & Polhemus 2017, new species
No full textMetrocoris johnpolhemi, new species (Figs. 7, 8, 34, 56–65) Material examined. Holotype (apterous male) & allotype (apterous female): VIETNAM: Hanoi, Ba Vi N’Park, stream near Coste 400, ca. 550 m asl, coll. Ngo Q.H. & Tran A.D., 27 April 2012, TAD1210 (ZMHU). Paratypes: VIETNAM: Hanoi: 11 males, 7 females (apt), 2 males, 2 females (mpt), same locality data as holotype (ZMHU, ZRC, NHMW); 3 males, 6 females (apt), Ba Vi N’Park, stream near Coste 400, ca. 550 m asl, coll. Ngo Q.H. et al., 16 December 2011, TAD1120 (ZMHU); 1 female (apt), Ba Vi N’Park, Minh Quang, stream near by Tan Vien Pagoda, 340 m asl, coll. Ngo Q.H. et al., 17 December 2011, TAD1125 (ZMHU); 1 female (apt), Ba Vi N’Park, nr. Son Tay, W. of Hanoi, first small stream on lower road, 575 m asl, 21°03′32″N, 105°21′12″E, water temp. 18°C, 4 April 2000, CL 4391, coll. J.T. Polhemus & P. Nguyen (USNM). Phu Tho Prov.: 1 male (mpt), Xuan Son N’Park, Lap stream, site 1, at Ngoc waterfall, coll. Tran A.D. et al., 5 June 2013, TAD1331 (ZMHU); 1 male (apt), 1 male (mpt), Xuan Son N’Park, Kim Thuong, Tan Ong stream, site 1, at Chin Tang waterfall, coll. Tran A.D. et al., 6 June 2013, TAD1334 (ZMHU); 1 male, 1 female (apt), Xuan Son N’Park, Kim Thuong, Tan Ong stream, site 1, at Chin Tang waterfall, coll. Nguyen T.S. et al., 26 August 2014, TS1401 (ZMHU); 1 male, 2 females (mpt), Xuan Son N’Park, Kim Thuong, Tan Ong stream, site 1, at Chin Tang waterfall, coll. Nguyen T.S. et al., 22 May 2015, TS1503 (ZMHU); 2 males, 2 females (mpt), Xuan Son N’Park, Lap stream, site 1, at Ngoc waterfall, coll. Tran A.D. et al., 23 May 2015, TS1511 (ZMHU). Lai Chau Prov.: 2 females (apt), 2 males, 4 females (mpt), Nam Ceung stream, trib. to Nam Na River, 15.5 km N. of Lai Chau, 200 m asl, 22°08′52″N, 103°11′33″E, water temp. 21.5°C, 11 April 2000, 10:00–13:00 hrs., CL 4409, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen (USNM, BPBM); 1 male, 2 females (apt), 3 females (mpt), cascading stream 12 km N. of Lai Chau, 290 m asl, 22°07′19″N, 103°11′30″E, water temp. 22°C, 11 April 2000, 13:45–16:00 hrs., CL 4410, coll. D.A. Polhemus, J.T. Polhemus & P. Nguyen (USNM, BPBM); 1 male, 1 female (mpt), Tam Duong, Ho Thau, stream at Su Thang brigde, km 9 Nat. Road #4D, coll. Tran A.D. et al., 31 May 2013, TAD1324 (ZMHU). Diagnosis. Male: fore femur variably incrassate (ratio length/ width: 3.32–4.25, holotype: 3.32), ventral surface of fore femur in distal one-fourth with indentation and with single large sub-apical tooth; inner surface of fore tibia subbasally with tooth-like elevation (Figs. 56, 57). Male genitalia large: pygophore not raised posteriorly, caudal margin broadly rounded, dorso-lateral process curved and apically blunt (Fig. 59); proctiger elongate (Fig. 60); paramere prominent, falciform, strongly curved, slightly expanded on distal part, apex rounded (Figs. 34, 61); endosoma (Figs. 62, 63): dorsal sclerite long and recurved proximally, apical accessory sclerite small and weakly sclerotised, lateral sclerite broad and long, accessory lateral sclerite present. Female: tergum 7 subtriangular, not produced posteriorly (Fig. 64); sternum 7 (Fig. 65) large, distinctly longer than preceding abdominal sterna together, posterior one-third constricted and forming two widely separated lobes, apices of lobes angular, surpassing apex of proctiger in ventral view, the notch between lobes as wide as each lobe and with angular margin. Description. Size: apterous males: length 6.32–6.72 (holotype: 6.65), width 2.85–3.05 (holotype: 3.02); macropterous males: wings 8.10–8.20, width 2.97–3.07; apterous females: length 5.19–5.70 (allotype: 5.70), width 2.93–3.17 (allotype: 3.09); macropterous females: 7.20, width 2.94–2.97. Colour (Figs. 7, 8): Apterous morph: Dorsal dark markings prominent. Interocular area with light brown mark or without dark mark. Antenna: segment 1 almost entirely yellowish or with distal part brown, segments 2–4 light brown to dark brown. Pronotum with median black T-shaped mark at anterior margin and with two dark brown or black marks near anterolateral margin. Mesonotum with black marks: lateral stripes and median longitudinal stripe slender, running toward posterior margin and connected with anterior mark; sublateral stripes slender; each side of mesopleura with a longitudinal slender brown mark, usually variable. Metanotum with black marks running along anterior and lateral margins and with a medial longitudinal mark, bordering two broad, hookshaped yellowish marks; metacetabula with black stripe, running throughout its length. Fore femur: (a) of the male with apical dark ring and four longitudinal marks of which ventral mark dark brown and connected with ring, and lateral marks dark brown, not confluent with ring, dorsal mark light brown and not confluent with ring; (b) of the female with three slender, usually light brown, longitudinal mark, one on dorsal, one on ventral and the other one on external side of femur, all not confluent with dark ring. Fore tibia yellowish at basal one-fifth or basal one-fourth, distal part dark brown; fore tarsus dark brown. Middle and hind legs: femora yellow or sometimes brownish, tibiae and tarsi dark brownish. Abdomen mainly blackish dorsally, tergum 1 with one yellowish mark posteriorly, terga 2–7: anterior halves blackish, posterior halves yellowish. Venter bright yellowish. Macropterous morph: Pronotum with black mark on anterior margin, confluent with anterolateral marks and the median longitudinal stripe; two light brown sublateral marks confluent with the median stripe; lateral margin between anterior corner and humeri dark brown; posterior margin between humeri and apex yellowish. Fore wings mainly dark brown, anterior margin yellowish. Apterous male (holotype): Head width 1.72; interocular width 0.63; eye size 0.82. Lengths of antennal segments 1–4: 2.50: 1.05: 0.99: 0.84. Pronotum length 0.69. Mesonotum length 1.57. Lengths of leg segments: fore leg: 3.15: 2.70: 0.16: 0.93; middle leg: 7.70: 5.70: 2.60: 0.34; hind leg: 7.60: 4.53: 0.35: 0.41. Fore femur incrassate, width of femur: 0.95, ratio length/width: 3.32, black granules scattered along ventral surface; other characteristics of fore femur as in Diagnosis above (Figs. 56, 57). Abdomen length on ventral view: 2.69, pregenital length 0.65; sternum 7 slightly longer than sterna 5 and 6 combined, length 0.25. Genitalia of male: Abdominal segment 8 (Fig. 58): large, with posterodorsal margin strongly upcurved; posterior dorsum and lateral sides of segment bearing long hairs; postero-ventral margin bearing short, but wide lobe, ventral length 0.85, width 1.37. Characteristics of pygophore, proctiger, paramere, and endosoma as in Diagnosis above. Apterous female (allotype): Head width 1.64; interocular width 0.61; eye size 0.77. Lengths of antennal segments 1–4: 1.83: 0.85: 0.93: 0.79. Pronotum length 0.52. Mesonotum length 1.50. Lengths of leg segments: fore leg: 2.33: 2.13: 0.15: 0.77; middle leg: 6.10: 4.50: 2.15: 0.29; hind leg: 5.90: 3.75: 0.27: 0.37. Fore femur slender, without teeth, width 0.36, ratio length/width: 6.47. Abdominal venter length 1.63, length of tergum 7: 0.43, length of sternum 7: 0.88. Shape of sternum 7: see Diagnosis above. Macropterous male: Head width 1.71, interocular width 0.68, eye size 0.79. Lengths of antennal segments 1–4: 2.63: 1.08: 0.97: 0.90. Pronotum: apex of pronotal lobe pointed, median length 3.60, humeral width 2.75. Fore wing length 6.0. Lengths of leg segments: fore leg: 3.17: 2.69: 0.13: 0.94; middle leg: 7.60: 5.50: 2.63: 0.32; hind leg: 7.60: 4.55: 0.35: 0.39. Fore femur incrassate, ratio length/width: 3.69. Abdomen length on ventral view: 2.47, pregenital length 0.61; sternum 7 slightly longer than sterna 5 and 6 combined, length 0.25. Other characteristics as in apterous males. Macropterous female: Head width 1.59, interocular width 0.59, eye size 0.75. Lengths of antennal segments 1–4: 1.83: 0.81: 0.90: 0.77. Pronotum: apex of pronotal lobe pointed, median length 3.30, humeral width 2.45. Fore wing length 5.72. Lengths of leg segments: fore leg: 2.35: 2.05: 0.14: 0.76; middle leg: 6.00: 4.50: 2.25: 0.30; hind leg: 6.00: 3.88: 0.31: 0.38. Fore femur as slender as in apterous female, ratio length/width: 6.71. Abdominal venter length 1.53, length of sternum 7: 0.90. Other characteristics as in apterous females. Remarks. Metrocoris johnpolhemi, new species, belongs to the M. bilobatus species group (sensu Chen & Nieser, 1993). This new species is similar to M. bilobatus den Boer, 1965 and M. strictus Chen & Nieser, 1993, in having the sub-apical indentation on the fore femur of the male without a proximal tooth. The shape of sternum 7 of the female in M. johnpolhemi is relatively similar to that of M. bilobatus, but they can be easily separated because in M. johnpolhemi the posterior lobes are clearly slanted outwards with pointed apices, and the notch between these lobes is wider and has a clearly angular median margin (while in the latter, the lobes are pointed posteriorly with rounded apices, and the notch between the lobes is narrower and has a rounded median margin). In Vietnam, there are currently three known species of the M. bilobatus group, namely M. johpolhemi, new species, M. bilobatoides Chen & Nieser, 1993, a taxon probably restricted to northern Vietnam, and M. vietnamensis Tran & Zettel, 2005, a taxon probably restricted to central Vietnam. This new species differs from M. vietnamensis and M. bilobatoides in regard to the following structures: (1) fore femur of the male: in M. johnpolhemi there is no tooth at the proximal edge, and the sub-apical tooth is large, while the latter two species possess a small tooth at the proximal edge present together with a large sub-apical tooth; (2) the shape of paramere: in M. johnpolhemi the shaft of the paramere is expanded on the distal half with a rounded apex, while in the latter two species the shaft of the paramere tapers along its length, and has a pointed apex); (3) abdominal sternum 7 of the female: in M. johnpolhemi the distal lobes are long, surpassing the apex of the proctiger in ventral view, and the notch between the two distal lobes is wide and has an angular margin, while in M. bilobatoides the distal lobes are shorter and the notch between the lobes is narrow and angular, and in M. vietnamensis the distal lobes are also short, and the notch wide, but with a rounded margin. Etymology. This species is dedicated to the late Dr. John T. Polhemus, in honour of his contribution to our knowledge of water bugs in Southeast Asia. Distribution. Vietnam: Hanoi (Ba Vi), Lai Chau, Phu Tho (Fig. 138). Habitats. Specimens of M. johnpolhemi were collected from forested hill streams in several localities in northern Vietnam, at elevations ranging ca. 300–600 m above sea level.Published as part of A. D., Tran & Polhemus, D. A., 2017, The genus Metrocoris Mayr, 1865 (Gerromorpha: Gerridae) in Vietnam, with descriptions of five new species, pp. 109-149 in Raffles Bulletin of Zoology 65 on pages 119-122, DOI: 10.5281/zenodo.450263
RESULTS OF ARCHAEOLOGICAL FIELDWORK IN THE DISTRICTS OF DAK SONG AND DAK MIL, DAK NONG PROVINCE, IN 2018
No full textThis study investigates the archaeological potential of Dak Nong Province, Vietnam, as revealed by fieldwork in the Dak Song and Dak Mil districts. We conducted field surveys at various sites, resulting in the discovery of a rich prehistoric heritage in the region, despite challenges posed by complex natural conditions. While artifact distribution and concentration vary across sites, we identified significant concentrations in areas near lakes, rivers, and streams. We find that at locations such as Village 9A, volcanic Lake Dak Mil, and Tay Son Village, traces of concentration are faint. In contrast, at sites such as Dak Peur Border Gate and Tan Lap Village, there are traces of a dense population and long occupation by prehistoric people. The prehistoric inhabitants of Dak Mil and Dak Song districts often lived along lakes, rivers, and streams that did not dry up in the dry season; they lived in a large area and were highly mobile. Our preliminary research highlights the value of Dak Nong Province in studying the early stages of prehistory and cultural development in the Central Highlands region of Vietnam. This also underscores the importance of preserving and promoting archaeological heritage in Dak Mil and Dak Song districts
Circulating miR-147b as a diagnostic marker for patients with bacterial sepsis and septic shock.
No full textBackgroundEarly diagnosis, precise antimicrobial treatment and subsequent patient stratification can improve sepsis outcomes. Circulating biomarkers such as plasma microRNAs (miRNAs) have proven to be surrogates for diagnosis, severity and case management of infections. The expression of four selected miRNAs (miR-146-3p, miR-147b, miR-155 and miR-223) was validated for their prognostic and diagnostic potential in a clinically defined cohort of patients with sepsis and septic shock.MethodsThe expression of plasma miRNAs was quantified by quantitative PCR (qPCR) in patients with bacterial sepsis (n = 78), in patients with septic shock (n = 52) and in patients with dengue haemorrhagic fever (DHF; n = 69) and in healthy controls (n = 82).ResultsThe expression of studied miRNA was significantly increased in patients with bacterial sepsis and septic shock. The plasma miR-147b was able to differentiate bacterial sepsis from non-sepsis and septic shock (AUC = 0.77 and 0.8, respectively, p≤ 0.05), while the combination of plasma miR-147b and procalcitonin (PCT) predicted septic shock (AUC = 0.86, p≤ 0.05).ConclusionsThe plasma miR-147b may be an useful biomarker independently or in combination with PCT to support clinical diagnosis of sepsis and equally prognosis of patients with septic shock
NHÓM DI CHỈ KHẢO CỔ HỌC SUỐI BA (TỈNH ĐẮK NÔNG): TƯ LIỆU, NHẬN THỨC VÀ THẢO LUẬN
No full textThis article introduces the results of investigations and surveys from 2006 to 2017 of the
group of Suoi Ba archaeological sites in Nhan Co commune, Dak R’Lap district (Dak Nong).
The results reveal eight prehistoric archaeological sites in the Suoi Ba area, which are
distributed over an area of about 20 hectares, equivalent to the size of an ancient village,
and date from 3,500 to 2,000 years BP. In this study, the authors systematize materials, assess
historical-cultural values, briefly outline the prehistoric cultural process at Suoi Ba during
the late Neolithic and early Metal Age in Dak Nong, and discuss issues related to Suoi Ba
relics in a broader context.12497-12
