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lingzi326
ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)
- Ó¦Öú: 1 (Ó×¶ùÔ°)
- ¹ó±ö: 0.95
- ½ð±Ò: 4427
- É¢½ð: 2293
- ºì»¨: 12
- Ìû×Ó: 1765
- ÔÚÏß: 318Сʱ
- ³æºÅ: 270203
- ×¢²á: 2006-08-05
- ÐÔ±ð: MM
- רҵ: Åäλ»¯Ñ§
- ¹ÜϽ: ¾§Ìå
waiy2001(½ð±Ò+0,VIP+0):ºÇºÇ£¬ÀϰæÖ÷Ôõô²»ÌṩÏÂÔØÄØ£¬ÎÒÒ²ÏëÏÂÏÂÀ´¿´¿´Ñ½
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¡¾Ñ§¿ÆÁìÓò¡¿ÉúÎïÎÞ»ú»¯Ñ§ ¡¾ÎÄÏ×ÌâÄ¿¡¿Highly Sensitive and Selective Colorimetric Sensors for Uranyl (UO2 2+): Development and Comparison of Labeled and Label-Free DNAzyme-Gold Nanoparticle Systems ¡¾ÆÚ¿¯À´Ô´¡¿J. AM. CHEM. SOC. ¡¾×÷Õß»ò¿ÎÌâ×é¡¿Yi Lu ¡¾·¢±íʱ¼ä¡¿ 2008, 130, 14217¨C14226 [ Last edited by lingzi326 on 2008-12-27 at 23:09 ] |

2Â¥2008-12-27 14:23:31
lingzi326
ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)
- Ó¦Öú: 1 (Ó×¶ùÔ°)
- ¹ó±ö: 0.95
- ½ð±Ò: 4427
- É¢½ð: 2293
- ºì»¨: 12
- Ìû×Ó: 1765
- ÔÚÏß: 318Сʱ
- ³æºÅ: 270203
- ×¢²á: 2006-08-05
- ÐÔ±ð: MM
- רҵ: Åäλ»¯Ñ§
- ¹ÜϽ: ¾§Ìå
¡ï ¡ï ¡ï ¡ï
waiy2001(½ð±Ò+4,VIP+0):½±ÀøÒ»ÏÂ,ºÇºÇ
waiy2001(½ð±Ò+4,VIP+0):½±ÀøÒ»ÏÂ,ºÇºÇ
|
¡¾Ñ§¿ÆÁìÓò¡¿¾§Ìå ¡¾ÎÄÏ×ÌâÄ¿¡¿Polymorphism of a Simple Organic Amide ¡¾ÆÚ¿¯À´Ô´¡¿Cryst. Growth Des. ¡¾×÷Õß»ò¿ÎÌâ×é¡¿Melanie R. Hauser,† Lev Zhakarov,† Kenneth M. Doxsee,*,† and Tonglei Li‡ ¡¾·¢±íʱ¼ä¡¿2008 ¡¾ÄÚÈݼò½é¡¿ Glycolanilide (2-hydroxy-N-phenylacetamide), a simple amide, may be reproducibly crystallized in either of two polymorphic forms. The crystal and molecular structures of each polymorph have been determined, revealing that the two polymorphs differ in the extent and arrangement of intermolecular hydrogen bonding. The more stable polymorph displays one-dimensional chains linked through hydrogen bonds between the amide carbonyl and the R-hydroxyl group. In the metastable polymorph, analogous chain structures are overlain with cyclic hydrogen-bonded amide dimers, with an additional set of hydrogen bonding contacts joining the chain and cyclic motifs. |

3Â¥2008-12-28 23:12:05
xxiaojjie
ľ³æ (ÖøÃûдÊÖ)
- Ó¦Öú: 9 (Ó×¶ùÔ°)
- ½ð±Ò: 1530.5
- É¢½ð: 125
- ºì»¨: 15
- Ìû×Ó: 1796
- ÔÚÏß: 456.9Сʱ
- ³æºÅ: 293856
- ×¢²á: 2006-11-05
- רҵ: ÓлúºÏ³É
¡ï ¡ï ¡ï ¡ï
waiy2001(½ð±Ò+4,VIP+0):лл֧³Ö°æÖ÷»î¶¯,ºÇºÇ
waiy2001(½ð±Ò+4,VIP+0):лл֧³Ö°æÖ÷»î¶¯,ºÇºÇ
|
¡¾Ñ§¿ÆÁìÓò¡¿ ¡¾ÎÄÏ×ÌâÄ¿¡¿Rational Design of Macrometallocyclic Trinuclear Complexes with Superior ð-Acidity and ð-Basicity ¡¾ÆÚ¿¯À´Ô´¡¿J. AM. CHEM. SOC. ¡¾×÷Õß»ò¿ÎÌâ×é¡¿Sammer M. Tekarli, Thomas R. Cundari,* and Mohammad A. Omary* ¡¾·¢±íʱ¼ä¡¿2008, 130, 1669-1675 ÄÉÃ×ÅÌ£º http://www.namipan.com/d/Superio ... eedb6757842ae532800 ¸öÈ˾õµÃºÜ²»´í£¬ÖµµÃÑо¿ |
4Â¥2008-12-29 10:54:17
lingzi326
ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)
- Ó¦Öú: 1 (Ó×¶ùÔ°)
- ¹ó±ö: 0.95
- ½ð±Ò: 4427
- É¢½ð: 2293
- ºì»¨: 12
- Ìû×Ó: 1765
- ÔÚÏß: 318Сʱ
- ³æºÅ: 270203
- ×¢²á: 2006-08-05
- ÐÔ±ð: MM
- רҵ: Åäλ»¯Ñ§
- ¹ÜϽ: ¾§Ìå

5Â¥2008-12-30 22:33:58
patriot_csu
ÖÁ×ðľ³æ (ÕýʽдÊÖ)
- CMEI: 2
- Ó¦Öú: 1 (Ó×¶ùÔ°)
- ½ð±Ò: 10545.9
- ºì»¨: 5
- Ìû×Ó: 985
- ÔÚÏß: 224Сʱ
- ³æºÅ: 447267
- ×¢²á: 2007-10-31
- רҵ: ÎÞ»úºÏ³ÉºÍÖÆ±¸»¯Ñ§
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waiy2001(½ð±Ò+4,VIP+0):ºÜÇ¿´ó£¬ºÇºÇ
lingzi326(½ð±Ò+2,VIP+0):¼ÓÈë×Ô¼ºµÄÌå»á£¬¶à½±ÀøÒ»ÏÂ
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lingzi326(½ð±Ò+2,VIP+0):¼ÓÈë×Ô¼ºµÄÌå»á£¬¶à½±ÀøÒ»ÏÂ
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¡¾Ñ§¿ÆÁìÓò¡¿·ÛÄ©¾§Ìåѧ ¡¾ÎÄÏ×ÌâÄ¿¡¿Structure determination from powder diffraction data ¡¾ÆÚ¿¯À´Ô´¡¿Acta Cryst A ¡¾×÷Õß»ò¿ÎÌâ×é¡¿W. I. F. David and K. Shankland ¡¾·¢±íʱ¼ä¡¿2008 ¡¾ÄÚÈݼò½é¡¿Advances made over the past decade in structure determination from powder diffraction data are reviewed with particular emphasis on algorithmic developments and the successes and limitations of the technique. ¡¾Ìå»á&ÊÕ»ñ¡¿2008Äê×îºÃµÄ¹ØÓÚ·ÛÄ©ÑÜÉä½âÎö½á¹¹µÄ×ÛÊöÎÄÕ£¬Á˽⵽·ÛÄ©¾§ÌåѧÁìÓò×îÈ«×îеÄÑо¿·½ÏòºÍ¶¯Ì¬¡£ [ Last edited by patriot_csu on 2008-12-31 at 02:35 ] |
6Â¥2008-12-31 02:33:23
patriot_csu
ÖÁ×ðľ³æ (ÕýʽдÊÖ)
- CMEI: 2
- Ó¦Öú: 1 (Ó×¶ùÔ°)
- ½ð±Ò: 10545.9
- ºì»¨: 5
- Ìû×Ó: 985
- ÔÚÏß: 224Сʱ
- ³æºÅ: 447267
- ×¢²á: 2007-10-31
- רҵ: ÎÞ»úºÏ³ÉºÍÖÆ±¸»¯Ñ§
¡ï ¡ï ¡ï ¡ï
waiy2001(½ð±Ò+4,VIP+0):ºÃµÄÎÄÕÂ
waiy2001(½ð±Ò+4,VIP+0):ºÃµÄÎÄÕÂ
|
¡¾Ñ§¿ÆÁìÓò¡¿µç¾µ¾§Ìåѧ ¡¾ÎÄÏ×ÌâÄ¿¡¿Electron crystallography : imaging and single-crystal diffraction from powders ¡¾ÆÚ¿¯À´Ô´¡¿Acta Cryst A ¡¾×÷Õß»ò¿ÎÌâ×é¡¿Xiaodong Zou and Sven Hovmoller ¡¾·¢±íʱ¼ä¡¿2008 ¡¾ÄÚÈݼò½é¡¿Different techniques developed for electron crystallography, including three-dimensional reconstruction, the electron precession technique and ultrafast electron crystallography, are reviewed. Examples of electron-crystallography applications are given. ¡¾Ìå»á&ÊÕ»ñ¡¿2008Äê×îºÃµÄ¹ØÓÚµç×Ó¾§ÌåѧµÄ×ÛÊöÎÄÕ£¬Á˽⵽¸ÃÁìÓò×îÈ«×îеÄÑо¿·½ÏòºÍ¶¯Ì¬¡£ |
7Â¥2008-12-31 02:41:20
buffaloli
ÈÙÓþ°æÖ÷ (ÖªÃû×÷¼Ò)
- Ó¦Öú: 1 (Ó×¶ùÔ°)
- ¹ó±ö: 2.71
- ½ð±Ò: 32599.2
- É¢½ð: 9
- ºì»¨: 20
- ɳ·¢: 1
- Ìû×Ó: 7954
- ÔÚÏß: 101.5Сʱ
- ³æºÅ: 313508
- ×¢²á: 2007-02-24
- רҵ: ²ÄÁÏÎïÀí»¯Ñ§
- ¹ÜϽ: ´ß»¯
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lingzi326(½ð±Ò+6,VIP+0):·Ç³£¸Ðл·ÖÏí£¬Ï£ÍûÌṩ¸ü¶àºÃÎÄÏ×(¡É_¡É)
lingzi326(½ð±Ò+6,VIP+0):·Ç³£¸Ðл·ÖÏí£¬Ï£ÍûÌṩ¸ü¶àºÃÎÄÏ×(¡É_¡É)
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¡¾Ñ§¿ÆÁìÓò¡¿¿ò¼Ü½á¹¹¾§ÌåÉú³¤ ¡¾ÎÄÏ×ÌâÄ¿¡¿From a 1-D Chain, 2-D Layered Network to a 3-D Supramolecular Framework Constructed from a Metal-Organic Coordination Compound ¡¾ÆÚ¿¯À´Ô´¡¿Crystal Growth & Design, ¡¾×÷Õß»ò¿ÎÌâ×é¡¿Shilun Qiu ¡¾·¢±íʱ¼ä¡¿2005 ¡¾ÄÚÈݼò½é¡¿Three new metal-organic coordination polymers, Cd(bpdc)(phen)2â2H2O (1) (H2bpdc ) biphenyl-4,4¢- dicarboxylic acid), Cd(BDC)(phen)âDMF (2) (H2BDC ) benzene-1,4-dicarboxylic acid), and Cd2(btec)(phen)2(H2O)2 (3) (H4btec ) 1,2,4,5-benzenetetracarboxylic acid), were synthesized under different conditions by using the metalorganic coordination compound Cd(phen)2(NO3)2 as the metal source instead of inorganic metal salt. Polymer 1 is a 1-D zigzag chain, which crystallizes in the monoclinic system, Cc space group. Polymer 2 is a 2-D layered network, which crystallizes in the monoclinic system, P2/c space group. The 3-D supramolecular framework 3 crystallizes in the triclinic system, P1h space group. The particular interest of 3 is two entirely independent cadmium atoms in its structure. They separately form 1-D polymeric chains, which are alternately arranged to form a 3-D supramolecular framework through interchain hydrogen bonds. Additionally, these three compounds show strong fluorescence in the solid state at room temperature ¡¾Ìå»á&ÊÕ»ñ¡¿²»Í¬Î¬ÊýµÄ¾§ÌåÖ®¼äת»¯Éú³É¿ò¼Ü½á¹¹µÄ·¶Àý |
8Â¥2009-01-01 09:44:32
zyr3365754
ľ³æ (ÖøÃûдÊÖ)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 5011.5
- É¢½ð: 222
- ºì»¨: 1
- Ìû×Ó: 1192
- ÔÚÏß: 115.4Сʱ
- ³æºÅ: 655081
- ×¢²á: 2008-11-15
- ÐÔ±ð: GG
- רҵ: ÀíÂۺͼÆË㻯ѧ
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waiy2001(½ð±Ò+5,VIP+0):лл֧³Ö°æÖ÷»î¶¯
waiy2001(½ð±Ò+5,VIP+0):лл֧³Ö°æÖ÷»î¶¯
|
¡¾Ñ§¿ÆÁìÓò¡¿¾§Ì弯Ëã ¡¾ÎÄÏ×ÌâÄ¿¡¿Effect of temperature on the local angular thermal expansion and local structure for nickel-doped zinc fluosilicate ¡¾ÆÚ¿¯À´Ô´¡¿Chemical Physics Letters Volume 467, Issues 1-3, 15 December 2008, Pages 170-175 ¡¾×÷Õß»ò¿ÎÌâ×é¡¿Kuang Xiao-Yu ¡¾·¢±íʱ¼ä¡¿2008Äê10Ô ¡¾ÄÚÈݼò½é¡¿Previously published electron paramagnetic resonance (EPR) data for Ni2+(3d7) in hydrated and deuterated crystals of zinc and nickel fluosilicate have been re-analyzed to separate the static and dynamic contributions to the fine-structure (or axial zero-field-splitting) term D in the spin-Hamiltonian. While the Debye parameters of ZnSiF6¡¤6H2O and ZnSiF6¡¤6D2O were determined in an earlier low-temperature study1, those of the undiluted nickel crystals, for which good data between 4 and 77 K is lacking, have been estimated here by comparison of the data above 60 K with those for the corresponding zinc compounds. The numerical results indicate that the measured values of D are composed of a negative dynamical contribution produced by the rotational motions of the water ligands, together with both negative and positive static contributions produced by the water ligands, and the more distant [SiF6]2− and [Ni.6H2O]2+ complexes, respectively. A point-charge calculation shows the contribution of the latter to be roughly +2.5 cm−1 in NiSiF6¡¤6H2O. The exceptionally large temperature variations of D in these crystals is attributed to the near-cancellation of the positive and negative static contributions, leaving the effect of the dynamical contribution dominant. ¡¾Ìå»á&ÊÕ»ñ¡¿·ÖÎö²¿·Ö±È½Ï¶à£¬ÓÐÐÂÒ⣡ |
9Â¥2009-01-02 22:01:02
lucheng336
Òø³æ (ÕýʽдÊÖ)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 17.5
- É¢½ð: 322
- ºì»¨: 1
- Ìû×Ó: 516
- ÔÚÏß: 219.9Сʱ
- ³æºÅ: 467521
- ×¢²á: 2007-11-26
- ÐÔ±ð: GG
- רҵ: Ô×ӺͷÖ×ÓÎïÀí
¡ï ¡ï ¡ï ¡ï ¡ï
waiy2001(½ð±Ò+5,VIP+0):лл֧³Ö°æÖ÷»î¶¯
waiy2001(½ð±Ò+5,VIP+0):лл֧³Ö°æÖ÷»î¶¯
|
¡¾Ñ§¿ÆÁìÓò¡¿²ÄÁÏÎïÀí ¡¾ÎÄÏ×ÌâÄ¿¡¿Characterization of the High-Pressure Structural Transition and Thermodynamic Properties in Sodium Chloride: A Computational Investigation on the Basis of the Density Functional Theory ¡¾ÆÚ¿¯À´Ô´¡¿J. Phys. Chem. B 2008, 112, 13898¨C13905 ¡¾×÷Õß»ò¿ÎÌâ×é¡¿Cheng Lu, Xiao-Yu Kuang, and Qin-Sheng Zhu ¡¾·¢±íʱ¼ä¡¿August 24, 2008 ¡¾ÄÚÈݼò½é¡¿Using first-principles calculations, the elastic constants, the thermodynamic properties, and the structural phase transition between the B1 (rocksalt) and the B2 (cesium chloride) phases of NaCl are investigated by means of the pseudopotential plane-waves method. The calculations are performed within the generalized gradient approximation to density functional theory with the Perdew-Burke-Ernzerhof exchange-correlation functional. On the basis of the third-order Birch-Murnaghan equation of states, the transition pressure Pt between the B1 phase and the B2 phase of NaCl is determined. The calculated values are generally speaking in good agreement with experiments and with similar theoretical calculations. From the theoretical calculations, the shear modulus, Young¡¯s modulus, rigidity modulus, and Poisson¡¯s ratio of NaCl are derived. According to the quasi-harmonic Debye model, we estimated the Debye temperature of NaCl from the average sound velocity. Moreover, the pressure derivatives of elastic constants, ∂C11/∂P, ∂C12/∂P, ∂C44/∂P, ∂S11/∂P, ∂S12/∂P, and ∂S44/∂P, for NaCl crystal are investigated for the first time. This is a quantitative theoretical prediction of the elastic and thermodynamic properties of NaCl, and it still awaits experimental confirmation. ¡¾Ìå»á&ÊÕ»ñ¡¿·¢J. Phys. Chem. BÒ²²»ÊÇÌ«ÄÑÒ®£¡ºÙºÙºÙ [ Last edited by lucheng336 on 2009-1-2 at 22:14 ] |
10Â¥2009-01-02 22:13:03













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