<div style="text-align:justify;"> An organogelator named N-[3-(hydroxy)-4-(dodecyloxy)-benzoyl]-N’ (4’-nitro-benzoyl) hydrazide (D12) was synthesized. It could form stable gels in some of the tested ...<div style="text-align:justify;"> An organogelator named N-[3-(hydroxy)-4-(dodecyloxy)-benzoyl]-N’ (4’-nitro-benzoyl) hydrazide (D12) was synthesized. It could form stable gels in some of the tested organic solvent. SEM images revealed that the molecules self- assembled into fibrous aggregates in the xerogels. The X-ray diffraction analysis showed that the xerogel exhibited a layered structure. FT-IR studies confirmed that intermolecular hydrogen bonding between C=O and N-H groups was the major driving force for gelation of organic solvents. The gel exhibited gel-sol transition and color change upon addition of F<span style="font-size:10px;"><sup>- </sup></span>. An extended conjugated system formed through the phenyl group and a five-membered ring based on intramolecular hydro-gen bonding between the oxygen atom near the deprotonation nitrogen atom and the other NH, which is responsible for the dramatic color change upon addition of <span style="text-align:justify;white-space:normal;">F</span><span style="font-size:10px;text-align:justify;white-space:normal;"><sup>- </sup></span>. </div>展开更多
The point power spectrum density and the wavenumber frequency spectrum density of turbulent - boundary- layer fluctuation pressure were measured in water-tunnel by use of a 8 mm hydrophone and a 20-element array, resp...The point power spectrum density and the wavenumber frequency spectrum density of turbulent - boundary- layer fluctuation pressure were measured in water-tunnel by use of a 8 mm hydrophone and a 20-element array, respectively. The non-dimensional representation of measured point power spectrum coincides with the measured results by Bull M. K. et. al. in wind tunnel. The convection peak can be seen clearly in the measured wavenumber frequency spectrum and the convection velocity can be calculated from the location of the convection peak. The response spectrum of a polyvinylidence fluoride (PVDF) hydrophone, which receiving area is 100 mm× 60 nun, was also measured. By comparing it with the response spectrtum of the 8 mm hydrophone, it is shown that the PVDF hyrdophone has a strong wavenumber filtering effect on turbulent - boundary-layer pressure fluctuation.展开更多
文摘<div style="text-align:justify;"> An organogelator named N-[3-(hydroxy)-4-(dodecyloxy)-benzoyl]-N’ (4’-nitro-benzoyl) hydrazide (D12) was synthesized. It could form stable gels in some of the tested organic solvent. SEM images revealed that the molecules self- assembled into fibrous aggregates in the xerogels. The X-ray diffraction analysis showed that the xerogel exhibited a layered structure. FT-IR studies confirmed that intermolecular hydrogen bonding between C=O and N-H groups was the major driving force for gelation of organic solvents. The gel exhibited gel-sol transition and color change upon addition of F<span style="font-size:10px;"><sup>- </sup></span>. An extended conjugated system formed through the phenyl group and a five-membered ring based on intramolecular hydro-gen bonding between the oxygen atom near the deprotonation nitrogen atom and the other NH, which is responsible for the dramatic color change upon addition of <span style="text-align:justify;white-space:normal;">F</span><span style="font-size:10px;text-align:justify;white-space:normal;"><sup>- </sup></span>. </div>
文摘The point power spectrum density and the wavenumber frequency spectrum density of turbulent - boundary- layer fluctuation pressure were measured in water-tunnel by use of a 8 mm hydrophone and a 20-element array, respectively. The non-dimensional representation of measured point power spectrum coincides with the measured results by Bull M. K. et. al. in wind tunnel. The convection peak can be seen clearly in the measured wavenumber frequency spectrum and the convection velocity can be calculated from the location of the convection peak. The response spectrum of a polyvinylidence fluoride (PVDF) hydrophone, which receiving area is 100 mm× 60 nun, was also measured. By comparing it with the response spectrtum of the 8 mm hydrophone, it is shown that the PVDF hyrdophone has a strong wavenumber filtering effect on turbulent - boundary-layer pressure fluctuation.
