To promote the rational development and use of clean coal resources in China, data on the regional and age distribution of sulfur, arsenic and other harmful elements in Chinese coal was broadly collected, tested for c...To promote the rational development and use of clean coal resources in China, data on the regional and age distribution of sulfur, arsenic and other harmful elements in Chinese coal was broadly collected, tested for content, and analyzed. Coal in northwestern China is characterized by low to extremely low levels of sulfur; the coal of the Taiyuan Formation in northern China mainly has high-sulfur content; that of the Shanxi Formation is mainly characterized by low sulfur coal; and the Late Permian coal in southern China has overall higher sulfur content; other regions have low sulfur coal. The average content of harmful trace elements in the bulk of China＇s coal is similar to the corresponding content in the coal of the North America and the rest of the world, whereas the content of various elements （Hg, Sb and Se） is different in magnitude to the corresponding percentage in the crust. The average content of the elements Cr, Se, Co, Be, U, Br in Late Permian coal in S China ranks first in the country whereas the average content of Hg and CI in the coals of Late Carboniferous to Early Permian age in N China are the highest. The average content of Mn in Early and Middle Jurassic coal is higher in NW China. The high content of harmful elements in some coal should cause particular concern both in the development and utilization of coal.展开更多
The title compound （C19H23NO3） was synthesized by the one-pot reaction ofp-methoxybenzaldehyde, Meldrum＇s acid, dimedone and CH3NH3Cl （NaOAc） in ethanol under microwave irradiation without catalyst and its crysta...The title compound （C19H23NO3） was synthesized by the one-pot reaction ofp-methoxybenzaldehyde, Meldrum＇s acid, dimedone and CH3NH3Cl （NaOAc） in ethanol under microwave irradiation without catalyst and its crystal structure was determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/c with a = 8.7462（10）, b = 17.7367（19）, c = 11.5959（14） A, β = 110.981（3）°, V= 1679.6（3） A^3, Z = 4, Dc = 1.239 g/cm^3,μ（MoKa） = 0.083 mm^-1, F（000） = 672 and Mr = 313.38. The structure was refined to R = 0.0530 and wR = 0.1216. X-ray analysis reveals that the dihedral angle between plane 1 （N（1）, C（1）, C（2）, C（3）） and plane 2 （C（1）, C（2）, C（6）, C（7）, C（9）） is 3.64°, andt hat between plane 2 and plane 3 （C（11）～C（16）） is 85.33°.展开更多
The title compound 4-(4-chlorophenyl)-6-methyl-5-methoxy-caronyl-3,4-dihydro- pyrimidin-2(H)-one has been synthesized by the reaction of 4-chlorobenzaldehyde, methyl acetoa- cetate and urea using H3BO3 as a catalyst...The title compound 4-(4-chlorophenyl)-6-methyl-5-methoxy-caronyl-3,4-dihydro- pyrimidin-2(H)-one has been synthesized by the reaction of 4-chlorobenzaldehyde, methyl acetoa- cetate and urea using H3BO3 as a catalyst under microwave irradiation. Its structure was charac- terized by X-ray single-crystal diffraction techniques with the following data: triclinic, space group P1, a = 5.4513(4), b = 7.619(1), c = 16.118(4) ?, α = 80.42(1), β = 83.43(1), γ = 79.29(1)°, V = 646.19(19) ?3, Mr = 280.70, μ(MoKα) = 0.301 mm-1, Z = 2 and Dc = 1.443 g/cm3. In the molecule the pyrimidine ring is of boat conformation.展开更多
A study was carried out to control the noise produced by the ventilators at the Luling coalmine, which had caused serious noise pollution to the residents living around the mine for a long time. The main noise source ...A study was carried out to control the noise produced by the ventilators at the Luling coalmine, which had caused serious noise pollution to the residents living around the mine for a long time. The main noise source was found to be the dynamic noise at the outlet of the diffuser. The frequency of its peak value was 250 Hz. A special brick with a resonant frequency of 250 Hz was designed to eliminate this noise. The diffusion of a lower frequency noise has been successfully controlled by the installation of a noise-eliminating tower above the diffuser outlet. The detection results show that the noise in the nearby residential area has been lowered to an average 55.3dB(A) in the daytime from 69.8dB(A) and to 48.4dB(A) at night from 65.8dB(A).展开更多
A series of 10-methyl-1,2,3,4,5,6,7,8,9,10-decahydroacridine-1,8-dione derivatives were synthesized by one-pot reaction of aldehyde, dimedone or 1,3-cyclohexanedione and methylamine in glycol or water under microwave ...A series of 10-methyl-1,2,3,4,5,6,7,8,9,10-decahydroacridine-1,8-dione derivatives were synthesized by one-pot reaction of aldehyde, dimedone or 1,3-cyclohexanedione and methylamine in glycol or water under microwave heating without catalyst. The method has the advantage of short routine and reaction time, high yields as well as friendly environment. And the reaction was not only suitable for aliphatic and aromatic monoaldehyde, but also for aromatic dialdehyde.展开更多
A series of novel fused tetracyclic benzo[4,5]imidazo[1,2-a]thiopyrano[3,4-d]pyrimidin-4（3H）-one derivatives were synthesized via the reaction of aryl aldehyde, 2H-thiopyran-3,5（4H,6H）-dione, and 1H-benzo[d]imidaz...A series of novel fused tetracyclic benzo[4,5]imidazo[1,2-a]thiopyrano[3,4-d]pyrimidin-4（3H）-one derivatives were synthesized via the reaction of aryl aldehyde, 2H-thiopyran-3,5（4H,6H）-dione, and 1H-benzo[d]imidazol-2- amine in glacial acetic acid. This protocol features mild reaction conditions, high yields and short reaction time.展开更多
文摘To promote the rational development and use of clean coal resources in China, data on the regional and age distribution of sulfur, arsenic and other harmful elements in Chinese coal was broadly collected, tested for content, and analyzed. Coal in northwestern China is characterized by low to extremely low levels of sulfur; the coal of the Taiyuan Formation in northern China mainly has high-sulfur content; that of the Shanxi Formation is mainly characterized by low sulfur coal; and the Late Permian coal in southern China has overall higher sulfur content; other regions have low sulfur coal. The average content of harmful trace elements in the bulk of China＇s coal is similar to the corresponding content in the coal of the North America and the rest of the world, whereas the content of various elements （Hg, Sb and Se） is different in magnitude to the corresponding percentage in the crust. The average content of the elements Cr, Se, Co, Be, U, Br in Late Permian coal in S China ranks first in the country whereas the average content of Hg and CI in the coals of Late Carboniferous to Early Permian age in N China are the highest. The average content of Mn in Early and Middle Jurassic coal is higher in NW China. The high content of harmful elements in some coal should cause particular concern both in the development and utilization of coal.
基金The project was supported by the National Natural Science Foundation of China (No. 20372057), the Natural Science Foundation of Jiangsu Province (No. BK2001142), the Open Foundation of Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry and Chemical Engineering, Suzhou University (JSK 011) and the Key Lab of Biotechnology for Medicinal Plants of Jiangsu Province (01AXL 14)
文摘The title compound （C19H23NO3） was synthesized by the one-pot reaction ofp-methoxybenzaldehyde, Meldrum＇s acid, dimedone and CH3NH3Cl （NaOAc） in ethanol under microwave irradiation without catalyst and its crystal structure was determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/c with a = 8.7462（10）, b = 17.7367（19）, c = 11.5959（14） A, β = 110.981（3）°, V= 1679.6（3） A^3, Z = 4, Dc = 1.239 g/cm^3,μ（MoKa） = 0.083 mm^-1, F（000） = 672 and Mr = 313.38. The structure was refined to R = 0.0530 and wR = 0.1216. X-ray analysis reveals that the dihedral angle between plane 1 （N（1）, C（1）, C（2）, C（3）） and plane 2 （C（1）, C（2）, C（6）, C（7）, C（9）） is 3.64°, andt hat between plane 2 and plane 3 （C（11）～C（16）） is 85.33°.
基金This work was supported by the NNSFC (No. 20372057) Natural Science Foundation of Jiangsu Province (No. BK2001142)+2 种基金 the Open Foundation of Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry and Chemical Engineering Su
文摘The title compound 4-(4-chlorophenyl)-6-methyl-5-methoxy-caronyl-3,4-dihydro- pyrimidin-2(H)-one has been synthesized by the reaction of 4-chlorobenzaldehyde, methyl acetoa- cetate and urea using H3BO3 as a catalyst under microwave irradiation. Its structure was charac- terized by X-ray single-crystal diffraction techniques with the following data: triclinic, space group P1, a = 5.4513(4), b = 7.619(1), c = 16.118(4) ?, α = 80.42(1), β = 83.43(1), γ = 79.29(1)°, V = 646.19(19) ?3, Mr = 280.70, μ(MoKα) = 0.301 mm-1, Z = 2 and Dc = 1.443 g/cm3. In the molecule the pyrimidine ring is of boat conformation.
文摘A study was carried out to control the noise produced by the ventilators at the Luling coalmine, which had caused serious noise pollution to the residents living around the mine for a long time. The main noise source was found to be the dynamic noise at the outlet of the diffuser. The frequency of its peak value was 250 Hz. A special brick with a resonant frequency of 250 Hz was designed to eliminate this noise. The diffusion of a lower frequency noise has been successfully controlled by the installation of a noise-eliminating tower above the diffuser outlet. The detection results show that the noise in the nearby residential area has been lowered to an average 55.3dB(A) in the daytime from 69.8dB(A) and to 48.4dB(A) at night from 65.8dB(A).
基金Project supported by the National Natural Science Foundation of China （No. 20372057） and the Natural Science Foundation of Jiangsu Province （No. BK2001142）.
文摘A series of 10-methyl-1,2,3,4,5,6,7,8,9,10-decahydroacridine-1,8-dione derivatives were synthesized by one-pot reaction of aldehyde, dimedone or 1,3-cyclohexanedione and methylamine in glycol or water under microwave heating without catalyst. The method has the advantage of short routine and reaction time, high yields as well as friendly environment. And the reaction was not only suitable for aliphatic and aromatic monoaldehyde, but also for aromatic dialdehyde.
基金Project supported by the Major Basic Research Project of the Natural Science Foundation of the Jiangsu Higher Education Institutions （09KJA430003）, Natural Science Foundation of Xuzhou City （XM09B016）, Graduate Foundation of Xuzhou Normal University （09YLB030） and Qing Lan Project （08QLT001）.
文摘A series of novel fused tetracyclic benzo[4,5]imidazo[1,2-a]thiopyrano[3,4-d]pyrimidin-4（3H）-one derivatives were synthesized via the reaction of aryl aldehyde, 2H-thiopyran-3,5（4H,6H）-dione, and 1H-benzo[d]imidazol-2- amine in glacial acetic acid. This protocol features mild reaction conditions, high yields and short reaction time.
