作者: 任爱民,封继康,肖长永,孙家锺,王江洪,余从煊 (吉林大学化学系;吉林大学理论化学所;北京理工大学化工与材料学院)
出处: 高等学校化学学报 1997 第18卷 第4期 P609
关键词: 双炔类衍生物;二阶非线性光学性质;三阶非线性光学性质
摘要: 在AM1和ZINDO方法基础上,按完全态求和和公式计算分子二阶非线性光学系数β_i_j_k和三阶非线性光学系数γ_i_j_k_l,并对含偶氮功能团的双炔类衍生物的二阶、三阶非线性光学性质进行了系统的理论研究。即在Ph-N=N-Ph-SO_3CH_2-C≡C-C≡C-CH_2OH基础上,在分子左端引入 ...
作者: 李兆民,魏英华,王守范 (北京理工大学飞行器工程系 北京 (100081))
出处: 推进技术 1997 第3期 P24-27
关键词: 火箭发动机;激振器;桥梁;动态特性;振动试验;
摘要: 介绍了火箭发动机用于大型钢筋立交桥激振,对北京西厢工程中菜户营立交桥和天宁寺立交桥进行振动特性试验和模态参数识别的研究情况,给出了试验结果,为桥梁的动态测试提供了一种新的激振方法。
作者: 葛蕴珊,吴思进,张付军,刘福水 (北京理工大学车辆工程学院;100081;北京理工大学;)
出处: 内燃机工程 1997 第18卷 第1期 P57-60
关键词: 尘埃;磨损;滤清器;柴油机
摘要: 通过向柴油机进气系统加入不同粒度的灰尘,研究了进气灰尘粒度对柴油机各零部件(如气缸套、活塞、活塞环、轴承等)的磨损及对柴油机功率的影响。实验结果表明,在实验条件下进气灰尘对柴油机气缸套和活塞环的磨损最大,而轴承的磨损很小。20~50μm的灰尘对柴油机的磨损影响最大,空气滤清器应尽可能滤去这尺寸范围 ...
作者: Qu, H;Li, QS;Zhu, HS
出处: CHINESE SCIENCE BULLETIN 1997 Vol.42 No.6 P462-465
关键词: HEXAAZABENZENE; N8
作者: Li, B;Wang, JQ (1BEIJING INST TECHNOL,SCH CHEM ENGN & MAT SCI,BEIJING 100081,PEOPLES R CHINA.)
出处: JOURNAL OF FIRE SCIENCES 1997 Vol.15 No.5 P341-357
关键词: HEAT RELEASE; POLYVINYL-CHLORIDE)
摘要: A wealth of literature in research at molecular levels concerning the transition metals, e.g., Cu-and Mo-containing compounds, has been intensively do ...
作者: Zhang, S;Wang, JQ;Xie, LQ;Wen, CL (1BEIJING INST TECHNOL,SCH CHEM ENGN & MAT SCI,STATE KEY LAB FLAME RETARDANT MAT,BEIJING 100081,PEOPLES R CHINA.)
出处: CHINESE SCIENCE BULLETIN 1997 Vol.42 No.18 P1549-1554
作者: Shuai, XT;Tan, HM;Jedlinski, Z (1BEIJING INST TECHNOL,DEPT CHEM ENGN,BEIJING 100081,PEOPLES R CHINA. POLISH ACAD SCI,INST POLYMER CHEM,PL-41800 ZABRZE,POLAND.)
出处: POLYMER BULLETIN 1997 Vol.39 No.1 P21-28
关键词: POLYMERS; DEGRADATION
摘要: Ricinoleic acid was esterified by fatty diacid chlorides to yield intermediate diacids, which were next converted to corresponding polyanhydrides by v ...
作者: Yuan, LM;Fu, RN;Gui, SH;Xie, XT;Dai, RJ;Chen, XX;Xu, QH (1BEIJING INST TECHNOL,DEPT CHEM ENGN,BEIJING 100081,PEOPLES R CHINA. YUNNAN NORMAL UNIV,DEPT CHEM,KUNMING 650092,PEOPLES R CHINA. YUNNAN UNIV,DEPT CHEM,KUNMING 6511091,PEOPLES R CHINA.)
出处: CHROMATOGRAPHIA 1997 Vol.46 No.5-6 P291-294
关键词: CAPILLARY
摘要: The gas chromatographic separation of xylene isomers using special mixed stationary phases consisting of heptakis(2.3.6-tri-O-pentyl)-beta-CD-AgNO3, h ...
作者: Tan, MQ;Lin, YC;Zhao, DZ
出处: APPLIED OPTICS 1997 Vol.36 No.4 P827-830
关键词: BAND REJECTION FILTERS; MULTILAYERS; FILMS; REGION; METAL
摘要: A kind of reflection filter with a narrow bandwidth and high reflectivity is designed as being composed of an all-dielectric Fabry-Perot filter, a hig ...
作者: Zheng, SC
出处: PHYSICS ESSAYS 1997 Vol.10 No.3 P442-453
摘要: Based on two fundamental principles, special relativity of angle [Phys. Essays 7, 34 (1994)] can give the relativistic angular space-time transformati ...
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