Publications by authors named "Ya-Ming Wu"

10 Publications

  • Page 1 of 1

Methyl 4-amino-2-chloro-pyrimidine-5-carboxyl-ate.

Authors:
Ya-Ming Wu

Acta Crystallogr Sect E Struct Rep Online 2014 Aug 17;70(Pt 8):o869. Epub 2014 Jul 17.

Department of Applied Chemistry, Nanjing College of Chemical Technology, Nanjing 210048, People's Republic of China.

In the title compound, C6H6ClN3O2, all non-H atoms are approximately coplanar [maximum deviation = 0.012 (4) Å]; an intra-molecular N-H⋯O hydrogen bond occurs between the amino group and the carbonyl group. In the crystal, mol-ecules are linked by N-H⋯N hydrogen bonds into supra-molecular chains propagated along [101].
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1107/S1600536814016080DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4158532PMC
August 2014

N-[5-(Di-phenyl-phosphorylmeth-yl)-4-(4-fluoro-phen-yl)-6-iso-propyl-pyrimi-din-2-yl]-N-methyl-methane-sulfonamide.

Authors:
Ya-Ming Wu

Acta Crystallogr Sect E Struct Rep Online 2013 Oct 19;69(Pt 11):o1673. Epub 2013 Oct 19.

Department of Applied Chemistry, Nanjing College of Chemical Technology, No. 625 Geguan Road, Dachang, Nanjing 210048, People's Republic of China.

In the title compound, C28H29FN3O3PS, the pyrimidine ring is oriented at a dihedral angle of 50.9 (2)° with respect to the floro-benzene ring, while the two phenyl rings bonding to the same P atom are twisted with respect to each other, making a dihedral angle of 62.2 (2)°. In the crystal, mol-ecules are linked by weak C-H⋯O and C-H⋯F hydrogen bonds into a three-dimensional supra-molecular architecture.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1107/S1600536813028286DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3884331PMC
October 2013

tert-Butyl 2-(6-{2-[2-(4-fluoro-phen-yl)-5-isopropyl-3-phenyl-4-(phenyl-carbamo-yl)pyrrol-1-yl]eth-yl}-2,2-dimethyl-1,3-dioxan-4-yl)acetate.

Authors:
Ya-Ming Wu

Acta Crystallogr Sect E Struct Rep Online 2013 Oct 9;69(Pt 11):o1621. Epub 2013 Oct 9.

Department of Applied Chemistry, Nanjing College of Chemical Technology, No. 625 Geguan Road, Dachang, Nanjing 210048, People's Republic of China.

The title compound, C40H47FN2O5, crystallizes with two independent but similar mol-ecules in the asymmetric unit. In the crystal, mol-ecules are linked into chains along [100] by inter-molecular N-H⋯O hydrogen bonds.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1107/S160053681302624XDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3884295PMC
October 2013

[Secondary aerosol formation through photochemical reactions estimated by using air quality monitoring data in the downtown of Pudong, Shanghai].

Huan Jing Ke Xue 2013 May;34(5):2003-9

Shanghai Environmental Monitoring Center, Shanghai 200030, China.

Analyses of diurnal patterns of PM10 in the downtown of Pudong, Shanghai have been performed in this study at different daily ozone maximum concentrations (O(3,max)) from May to October, 2010. In order to evaluate secondary aerosol formation at different ozone levels, CO was used as a tracer for primary aerosol, and 0(3, max) was used as an index for photochemical activity. Results show that along with increasing of O3 concentration, the concentration of primary and secondary aerosol was increased respectively from 0. 036 to 0.044 mg x m(-3) and from 0.018 to 0.055 mg x m(-3). The ratio of secondary to primary aerosol was increased from 49.8% to 124.5%. Furthermore, along with the increase of O(3, max) the forming time of O(3,max) and secondary aerosol was changed respectively from 13:00 to 14:00 and from 11:00-20:00 to 09:00-20:00. At the same time, the chemical composition of PM2.5 was different at different photochemical levels. PM(2.5) was composed of 12.0% organic carbon (OC), 18.7% sulfate (SO4(2-1)), 13.1% nitrate (NO3-) and 4.5% element carbon (EC) when O(3, max) was < 0.10 mg x m(-3) and PM2.5 was composed of 20.0% organic carbon (OC), 22.9% sulfate, 23.1% nitrate and 4.7% element carbon (EC) with O(3, max) > 0. 20 mg x m(-3). These results approved that the photochemical reactivity promoted the production of SO4(2-), NO3- and OC.
View Article and Find Full Text PDF

Download full-text PDF

Source
May 2013

4-Diphenyl-phosphanyl-1,5-naphthyridine.

Authors:
Ya-Ming Wu

Acta Crystallogr Sect E Struct Rep Online 2012 Oct 26;68(Pt 10):o3011. Epub 2012 Sep 26.

Department of Applied Chemistry, Nanjing College of Chemical Technology, No. 625 Geguan Road, Dachang, Nanjing 210048, People's Republic of China.

The asymmetric unit of the title compound, C(20)H(15)N(2)P, contains two independent mol-ecules with similar structures. The 1,5-naphthyridine ring system is nearly planar, with maximum deviations of 0.010 (3) and 0.012 (3) Å; its mean plane is oriented with respect to the two phenyl rings at 79.69 (12) and 84.00 (10)° in one mol-ecule, and at 74.25 (12) and 82.05 (11)° in the other. The two phenyl rings are twisted with respect to each other with a dihedral angle of 75.96 (14)° in one mol-ecule and 86.30 (13)° in the other.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1107/S1600536812039992DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3470369PMC
October 2012

[Characteristics of ambient VOCs and their role in O3 formation: a typical air pollution episode in Shanghai urban area].

Huan Jing Ke Xue 2011 Dec;32(12):3537-42

Shanghai Environmental Monitoring Center, Shanghai 200030, China.

The concentration, speciation and chemical reactivity of ambient volatile organic compounds (VOCs) in shanghai city were analyzed and measured by using online gas chromatography with flame ionization detection systems (GC-FID) during a typical air pollution episode (from Oct. 30th to Nov. 2nd, 2010) and 55 kinds of VOCs were detected. The results show that averaged concentrations of VOCs was 27 x 10(-9) before the episode, and then dramatically increased by 3 times (87 x 10(-9)) in the episode than the former, the main components were alkanes (35.2 x 10(-9)), aromatics (30.0 x 10(-9)), alkenes (21.6 x 10(-9)). Furthermore, the maximum ozone formation potential (PhiOFP) is analyzed and showed that PhiOFP (in the episode) > PhiOFP (after the episode) PhiOFP (before the episode). Before the episode, the percent of PhiOFP for aromatics 53.0% , alkenes 36. 1% and alkanes 11.7%; in the episode, the percent of PhiOFP for aromatics 54.7%, alkenes 36.7% and alkanes 9.8%; after the episode, the percent of PhiOFP for alkenes 52.7%, aromatics 36.0% and alkanes 13.2%. Alkenes (C2-C4) and aromatics (C6-C8) are the main components for the ozone formation, namely toluene, m,p-xylene, 1,3-butadiene, propene, ethene et al. In addition, the relationship is negative and nonlinear between the O3 and PhiOFP. And efficiencies of PhiOFP formed into O3 are below 20. 0% in different stage of episode. This is very important and meaningful for the quantitative evaluate the influence of VOCs towards O3.
View Article and Find Full Text PDF

Download full-text PDF

Source
December 2011

Ethyl 1-[(4-acetyl-2-methoxy-phen-oxy)meth-yl]cyclo-propane-1-carboxyl-ate.

Acta Crystallogr Sect E Struct Rep Online 2009 Jan 14;65(Pt 2):o305. Epub 2009 Jan 14.

In the title compound, C(16)H(20)O(5), the dihedral angle between the planar rings, viz. benzene and cyclo-propane, is 52.1 (2)°. Mol-ecules are connected in the crystal via weak inter-molecular C-H⋯O hydrogen bonds, forming chains in the [001] direction.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1107/S1600536809000956DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2968388PMC
January 2009

Methyl 5-bromo-6-methyl-picolinate.

Acta Crystallogr Sect E Struct Rep Online 2008 Dec 17;65(Pt 1):o134. Epub 2008 Dec 17.

The title compound, C(8)H(8)BrNO(2), does not show any significant inter-molecular π-π or C-H⋯π inter-actions in the crystal packing except for one weak Br⋯Br [3.715 (1) Å] inter-action.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1107/S1600536808042104DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2968052PMC
December 2008

An emission inventory of marine vessels in Shanghai in 2003.

Environ Sci Technol 2007 Aug;41(15):5183-90

Shanghai Environmental Monitoring Center, Shanghai 200030, PR China.

We developed an air pollutant emission inventory for marine vessels in the Shanghai Port in 2003. We estimated emissions under cruising and maneuvering conditions based on two categories of vessels: (1) vessels in the Outer Port, which enter the area following notification of the Shanghai Maritime Safety Administration, a division of the Ministry of Communications of P.R. China; and (2) vessels in internal waterways, which enter those waters following notification of the local Port Administration Centers. Vessels in the Outer Port consist of three subcategories: (1) international vessels that are engaged in foreign commerce; (2) domestic vessels traveling along the downstream portion of the Huangpu River; and (3) domestic vessels traveling along the coast. We also estimate emissions from vessels over 1000 DWT operating under hotelling conditions in the Outer Port. In 2003, the total number of calls was approximately 1.3 million, of which 57% is attributed to vessels in internal waterways and 43% to vessels in the Outer Port. Total marine emissions for NOx, SO2, PM, HC, and CO2 in 2003 are estimated to be 58,160, 51,180, 6960, 4560, and 3,012,800 tons, respectively. Emissions are allocated to 1 km x 1 km grid cells for the 129 km x 102 km Shanghai Port study domain.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/es061979cDOI Listing
August 2007

Fabrication and analysis of a Fabry-Perot cavity with a micromechanical wet-etching process.

Appl Opt 2004 Jun;43(16):3258-62

State Key Laboratories of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China.

We present a novel low-cost and batch fabrication method to fabricate a Fabry-Perot (FP) cavity with a micromechanical wet-etching process, through which FP cavities can be achieved with a cavity length of from several micrometers to tens of micrometers. The parallelism of mirror elements can be well achieved without electrostatic control. The quality of an etched surface can be greatly improved by the oxidation polish process. FP cavities with a finesse of approximately 50 are achieved. Analysis shows that the effective finesse is dominated mainly by the quality of the etched surface.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1364/ao.43.003258DOI Listing
June 2004