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THEORETICAL STUDY OF AN OSCILLATING WAVEFORM FUNCTION AND PARAMETERS FOR CONTROLLING THE NON-SINUSOIDAL OSCILLATION OF A MOLD 被引量:6
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作者 RenTingzhi LiuCai 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2004年第4期606-608,共3页
A new non-sinusoidal oscillation waveform is constructed for controlling themold oscillation during continuous casting. Casting velocity and oscillation parameters are thenestablished for a computer model of the conti... A new non-sinusoidal oscillation waveform is constructed for controlling themold oscillation during continuous casting. Casting velocity and oscillation parameters are thenestablished for a computer model of the continuous casting process. The waveform distortioncoefficient ? of waveform function is close to the waveform distortion rate a, so s is taken for awhen the basic parameters are selected initially. The waveform function can be created for the servohydraulic system or the mechanical driving system. Industrial scale experiments show the waveformfunction is effective. 展开更多
关键词 Continuous casting Mold non-sinusoidal oscillation
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Motion Stability Analysis of Non-sinusoidal Oscillation of Mold Driven by Servomotor 被引量:2
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作者 YAO Yunfeng LI Junxia FANG Yiming 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第6期1269-1276,共8页
The investments of the electro-hydraulic servo system of the mold non-sinusoidal oscillator are great, the modification ratio of the mechanical type is unable to be adjusted online, and some continuous casters suffer ... The investments of the electro-hydraulic servo system of the mold non-sinusoidal oscillator are great, the modification ratio of the mechanical type is unable to be adjusted online, and some continuous casters suffer from server resonance during the casting. A mold non-sinusoidal oscillation mechanism driven by servomotor is proposed and the prototype is produced in the lab, the investment is low and the modification ratio is can be adjusted online, and the stability problem is studied. At first the dynamics model of the servomotor non-sinusoidal oscillation is established, and the kinematics differential function is deduced. Furthermore, based on the harmonic balance method, the eigenvalues of the system are solved; the criterion of the stability of the system is put forward. In addition, the eigenvalues and harmonic with different oscillating parameters are analyzed. Analytical results show that the real parts of the eigenvalues are positive, the system will be unstable, and the resonance will occur when the positive real parts of the eigenvalues are extremum. A foundation is established for solving the running smooth problem and next application of this mechanism. 展开更多
关键词 continuous casting mold non-sinusoidal oscillation SERVOMOTOR STABILITY RESONANCE
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Analysis of Non-Sinusoidal Steady Electric Field of ±500 kV Converter Transformer 被引量:1
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作者 Gang Liu Cheng Chi +4 位作者 Yanjiao Jin Yongqiang Ma Lipeng Sun Lin Li Youliang Sun 《Energy and Power Engineering》 2017年第4期53-62,共10页
The line side winding is under the fundamental frequency AC voltage, while the valve side winding contains not only fundamental AC voltage component, but also the DC voltage component, fundamental AC voltage component... The line side winding is under the fundamental frequency AC voltage, while the valve side winding contains not only fundamental AC voltage component, but also the DC voltage component, fundamental AC voltage component, and higher harmonic voltage components when the converter transformer is at its normal operating condition, and the electric field of converter transformer is a non-sinusoidal steady one. To analyze the non-sinusoidal steady electric field containing the DC component, fundamental AC and higher harmonic components, the voltage spectrum of the valve winding in a ±500 kV converter transformer is firstly analyzed, and the non-sinusoidal periodic steady electric field is obtained by the fast discrete Fourier transform. Different resistivity of the oil and oil-immersed paper is adopted to simulate the aging of oil paper insulation at operation, and get the non-sinusoidal steady electric field. 展开更多
关键词 CONVERTER Transformer AC-DC Hybrid non-sinusoidal PERIODIC Electric Field
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Aperture Field Estimation in Waveguide for Non-Sinusoidal Periodic Excitation
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作者 Sushrut Das Kalidas Marandi 《Journal of Electromagnetic Analysis and Applications》 2012年第3期129-134,共6页
In this paper an attempt has been made to find the aperture field distribution in a rectangular waveguide for non-sinusoidal, periodic excitations using Multiple Cavity Modeling Technique. The excitation functions, co... In this paper an attempt has been made to find the aperture field distribution in a rectangular waveguide for non-sinusoidal, periodic excitations using Multiple Cavity Modeling Technique. The excitation functions, considered, are square, trapezoidal and clipped sine wave in nature. In the present analysis these time domain excitation functions have been represented in terms of a truncated Fourier series consisting of the fundamental frequency and its higher harmonics. Within the waveguide the fundamental frequency will give rise to a dominant mode excitation whereas the higher order modes will excite dominant as higher order modes. If the higher harmonics are assumed suppressed then the waveguide is subjected only to a dominant mode excitation. Results for dominant mode reflection coefficient (magnitude), VSWR and complex transmission coefficient have been computed and compared with theoretical data. The excellent agreement between them validates the analysis. 展开更多
关键词 WAVEGUIDES APERTURE Distribution non-sinusoidal PERIODIC EXCITATION MOMENT Method
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A Biproportional Construction Algorithm for Correctly Calculating Fourier Series of Aperiodic Non-Sinusoidal Signal
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作者 Zicheng Li Mingwei Ren +1 位作者 Zhaoling Chen Guohai Liu 《Engineering(科研)》 2021年第10期503-525,共23页
<span style="font-family:Verdana;">The </span><span style="font-family:Verdana;">Fourier series</span><span style="font-family:Verdana;"> (FS)</span>&l... <span style="font-family:Verdana;">The </span><span style="font-family:Verdana;">Fourier series</span><span style="font-family:Verdana;"> (FS)</span><span style="font-family:Verdana;"> applies to </span><span style="font-family:Verdana;">a </span><span style="font-family:Verdana;">periodic non-sinusoidal function</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">satisfying </span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">Dirichlet conditions, whereas </span><span style="font-family:Verdana;">the</span><span style="font-family:Verdana;"> being-processed function</span><span style="font-family:;" "=""> <img src="Edit_5f802cf4-e7c1-43f0-9bf6-97cfac22ce08.png" alt="" style="white-space:normal;" /></span><span style="font-family:;" "=""></span><span style="font-family:;" "=""><span style="font-family:Verdana;"> in practical applications is usually an aperiodic non-sinusoidal signal. When </span><img src="Edit_5f802cf4-e7c1-43f0-9bf6-97cfac22ce08.png" alt="" /><span style="font-family:Verdana;"> is aperiodic, its calculated </span></span><span style="font-family:Verdana;">FS</span><span style="font-family:Verdana;"> is not correct, </span><span style="font-family:Verdana;">which is </span><span style="font-family:Verdana;">still a challenging problem. To overcome the problem, </span><span style="font-family:Verdana;">we</span><span style="font-family:Verdana;"> derive a direct calculation algorithm, a constant iterati</span><span style="font-family:Verdana;">on </span><span style="font-family:Verdana;">algorithm, and an optimal iterati</span><span style="font-family:Verdana;">on </span><span style="font-family:Verdana;">algorithm. The direct calculation algorithm correctly calculate</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> its Fourier coefficients </span><span style="font-family:Verdana;">(FCs) </span><span style="font-family:;" "=""><span style="font-family:Verdana;">when </span><img src="Edit_5f802cf4-e7c1-43f0-9bf6-97cfac22ce08.png" alt="" style="white-space:normal;" /><span></span><span style="font-family:Verdana;"> is periodic</span></span><span style="font-family:Verdana;"> and </span><span style="font-family:Verdana;">satisf</span><span style="font-family:Verdana;">ies</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">Dirichlet conditions</span><span style="font-family:Verdana;">.</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">B</span><span style="font-family:Verdana;">oth the constant iterati</span><span style="font-family:Verdana;">on</span><span style="font-family:Verdana;"> algorithm and the optimal</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">iterati</span><span style="font-family:Verdana;">on</span><span style="font-family:Verdana;"> algorithm provide </span><span style="font-family:Verdana;">an</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">idea</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> of</span><span style="color:red;"> </span><span style="font-family:Verdana;">determining </span></span><span style="font-family:Verdana;">the </span><span style="font-family:;" "=""><span style="font-family:Verdana;">states of </span><img src="Edit_5f802cf4-e7c1-43f0-9bf6-97cfac22ce08.png" alt="" style="white-space:normal;" /><span></span></span><span style="font-family:Verdana;">.</span><span style="font-family:Verdana;"> From the </span><span style="font-family:Verdana;">idea</span><span style="font-family:Verdana;">, </span><span style="font-family:Verdana;">we obtain </span><span style="font-family:Verdana;">an algorithm for determining </span><span style="font-family:Verdana;">the </span><span style="font-family:;" "=""><span style="font-family:Verdana;">states of </span><img src="Edit_5f802cf4-e7c1-43f0-9bf6-97cfac22ce08.png" alt="" style="white-space:normal;" /><span></span><span style="font-family:Verdana;"> based on the optimal iterati</span></span><span style="font-family:Verdana;">on</span><span style="font-family:Verdana;"> algorithm. In the algorithm, </span><span style="font-family:Verdana;">the</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">variable</span><span style="font-family:Verdana;"> iterati</span><span style="font-family:Verdana;">on</span><span style="font-family:Verdana;"> step </span><span style="font-family:Verdana;">is</span><span style="font-family:Verdana;"> introduced</span><span style="font-family:Verdana;">;</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">t</span><span style="font-family:Verdana;">hus</span><span style="font-family:Verdana;">,</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">we present </span><span style="font-family:Verdana;">an algorithm for determining </span><span style="font-family:Verdana;">the </span><span style="font-family:;" "=""><span style="font-family:Verdana;">states of </span><img src="Edit_5f802cf4-e7c1-43f0-9bf6-97cfac22ce08.png" alt="" style="white-space:normal;" /><span></span><span style="font-family:Verdana;"> based on the </span></span><span style="font-family:Verdana;">variable</span><span style="font-family:Verdana;"> iterati</span><span style="font-family:Verdana;">on</span><span style="font-family:Verdana;"> step. </span><span style="font-family:Verdana;">The presented</span><span style="font-family:Verdana;"> algorithm accurately determine</span><span style="font-family:Verdana;">s</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">the </span><span style="font-family:;" "=""><span style="font-family:Verdana;">states of </span><img src="Edit_5f802cf4-e7c1-43f0-9bf6-97cfac22ce08.png" alt="" style="white-space:normal;" /><span></span></span><span style="font-family:Verdana;">. </span><span style="font-family:Verdana;">On the basis of the</span><span style="font-family:Verdana;">se</span><span style="font-family:Verdana;"> algorithms, </span><span style="font-family:Verdana;">we build </span><span style="font-family:Verdana;">a biproportional construction theory</span><span style="font-family:Verdana;">.</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">The </span><span style="font-family:Verdana;">theory</span><span style="font-family:Verdana;"> consists of a </span><span style="font-family:Verdana;">first </span><span style="font-family:Verdana;">and a second</span><span style="font-family:Verdana;"> proportional construction theory</span><span style="font-family:Verdana;">.</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">The</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">former</span><span style="font-family:Verdana;"> correctly </span><span style="font-family:Verdana;">calcula</span><span style="font-family:Verdana;">te</span><span style="font-family:Verdana;">s</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">the</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">FCs</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> of </span><img src="Edit_5f802cf4-e7c1-43f0-9bf6-97cfac22ce08.png" alt="" style="white-space:normal;" /><span></span><span style="font-family:Verdana;"> at </span></span><span style="font-family:Verdana;">the present</span><span style="font-family:Verdana;"> samp</span><span style="font-family:Verdana;">ling time</span> 展开更多
关键词 Fourier Coefficients (FCs) Fourier Series (FS) Iteration Algorithm Aperiodic non-sinusoidal Signal
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In vivo synaptic transmission in the zebra finch high vocal center and robust nucleus of the arcopallium after different stimulus patterns 被引量:4
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作者 Suqun Liao Wenxiao Liu Peng Xiao Dongfeng Li 《Neural Regeneration Research》 SCIE CAS CSCD 2008年第5期472-477,共6页
BACKGROUND: Electrophysiological studies using brain slices have revealed that the developmental regulation of synaptic plasticity in vocal learning pathway is essential for song learning in zebra finches. Publicatio... BACKGROUND: Electrophysiological studies using brain slices have revealed that the developmental regulation of synaptic plasticity in vocal learning pathway is essential for song learning in zebra finches. Publications reporting in vivo electrophysiological investigation are scarce. Many aspects of neural mechanisms underlying song learning and production still remain uncertain. OBJECTIVE: To observe the efficacy of paired pulses and the effect on synaptic transmission induced by low-frequency stimulations, high-frequency stimulations, and theta-burst stimulations. DESIGN, TIME AND SETTING: A comparative observation. The experiment was conducted from October 2006 to October 2007 in the Neurophysiology Laboratory of South-China Normal University. MATERIALS: Twenty-four adult male zebra finches were supplied by the Department of Animal Experiment of College of Life Sciences, South China Normal University. A SEN-7203 stimulator (NIHON KOHDEN), as well as a DSJ-731WF microelectrode amplifier and DSJ-F amplifier (provided by South-China Normal University), were used to stimulate and record, respectively. METHODS: Animals were randomly divided into low-frequency, high-frequency, and theta-burst frequency stimulation groups. After recording evoked potentials, an input-output curve was evaluated. Subsequently, the efficacy of paired pulses with different stimulus intensity (1/3, 1/2, 2/3, or 3/4 of the value that induced the largest synaptic response), as well as interpulse intervals (50, 75, and 100 ms), was measured in each group. The test stimulus intensity was set to a level that evoked 1/2 or 1/3 amplitude of the maximum response. MAIN OUTCOME MEASURES: Changes in amplitude, slope, and area of evoked potentials elicited by different stimulus patterns. RESULTS: (1) Efficacy of paired pulses: there was significant paired-pulse facilitation in the high vocal center and robust nucleus of the arcopallium (HVC-RA) synapse. Efficacy decreased when paired-pulse intervals or stimulus intensities were increased. (2) Low-frequency stimulations at 1 Hz had a negligible effect on efficacy of synaptic transmission, while 5 Hz depressed synaptic transmission for only 5 minutes. (3) High-frequency stimulations at 50 Hz or 100 Hz induced synaptic depression that lasted for up to 30 minutes. (4) Theta-burst stimulation depressed synaptic transmission efficiency significantly for about 10 minutes. However, in contrast to low-frequency or high-frequency stimulations, theta-burst stimulations also induced slight potentiation of synaptic transmission for up to 60 minutes following depression phase, although the slope or area did not change. CONCLUSION: Paired pulses induced a remarkable efficacy of paired pulses in the high vocal center and robust nucleus of the arcopallium pathway. Low-frequency, high-frequency, or theta-burst frequency stimulation did not induce long-lasting changes in synaptic transmission. 展开更多
关键词 electrical stimulus patterns synaptic transmission in vivo zebra finch
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Estimating energy release performance of oxidizer-activated aluminum fuel particles under ultrafast stimulus 被引量:3
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作者 Ya-ru Li Hui Ren +2 位作者 Xin-zhou Wu Hui-xin Wang Xi-long Yu 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第5期92-99,共8页
Aluminum(Al) particles are good fuel additives to improve the energy output performances of explosives. Under detonation environment, reaction delay of Al particles plays a key role in the energy release efficiency. U... Aluminum(Al) particles are good fuel additives to improve the energy output performances of explosives. Under detonation environment, reaction delay of Al particles plays a key role in the energy release efficiency. Up to date, reaction delay of Al particles is still limited by the efficiency of mass and heat transfer from oxidizers to Al particles. To address this issue, a homogeneous fuel-oxidizer assembly has recently become a promising strategy. In this work, oxidizer-activated Al fuel particles(ALG) were prepared with glycidyl azide polymer(GAP) as the oxidizer. The ALG was in uniform spherical shape and core-shell structure with shell layer of around 5 nm which was observed by scanning electron microscope and transmission electron microscope. The localized nanoscale mid-IR measurement detected the uniform distribution of characteristic absorption bond of GAP in the shell layer which confirmed the homogenous fuel-oxidizer structure of ALG. A thermal gravimetric analysis of ALG at ultrafast heating rate of 1000℃/min under argon atmosphere was conducted. The decomposition of GAP finished much earlier than that of GAP at heating rate of 10℃/min. Under ultrafast high laser fluence, the reaction response of ALG was characterized and compared with that of micro-sized Al(μAl). With the increase of laser energy, the propagation distance of the shock wave increased. However, the velocity histories were nearly the same when energies were lower than 299 mJ or higher than 706 mJ. The propagation distance of the shock wave for ALG was 0.5 mm larger than that for μAl at 2.1 μs. The underwater explosion showed the peak pressure and the shock wave energy of the ALG-based explosive were both higher than those of the μAl-based explosive at 2.5 m. This study shows the feasibility to improve the energy release of Al-based explosives via using the oxidizer-activated Al fuel particles with energetic polymer as the oxidizer. 展开更多
关键词 ALUMINUM Glycidyl azide polymer Laser DETONATION EXPLOSIVE Ultrafast stimulus
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Effect of Touch stimulus on the Expression of C-fos and TrkA in Spinal Cord Following Chronic Constriction Injury of the Sciatic Nerve in Rats 被引量:2
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作者 万丽 罗爱林 +1 位作者 喻红辉 田玉科 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2005年第2期219-222,共4页
Summary: To study the mechanism of the innoxious touch-stimulus on the modulation of hyperalgesia and the expression of the C-fos and the nerve growth factor (NGF) receptor-TrkA in the spinal dorsal horn neurons follo... Summary: To study the mechanism of the innoxious touch-stimulus on the modulation of hyperalgesia and the expression of the C-fos and the nerve growth factor (NGF) receptor-TrkA in the spinal dorsal horn neurons following the chronic constriction injury (CCI) of the sciatic nerve in rats, 60 female Sprague-Dawley rats were randomly divided into sham-operation group and CCI group, with each group being further divided into 3 subgroups on the 7th,14th and 28th day after operation (n=10). The mechanical and the thermal withdrawal threshold were assessed following the touch stiumulation after the CCI, immunohistochemical methods were employed to observe the expression of the C-fos and TrkA in spinal dorsal horn. Our results showed that the hyperalgesia appeared on the 4th day and reached the maximal level on the 14th day after operation. The expression of the C-fos also increased significantly and reached its maximal level on the 14th day after the touch-stimulus. Meanwhile, the TrkA expression was elevated significantly in both groups, as compared with basic data, and the difference was statistically significant (P<0.05). It is concluded that the level of the C-fos expression changed with the paw withdrawal threshold variation and increased markedly following the innoxious touch-stimulus. The expression of the TrkA receptors also increased gradually following the development of the neuropathic pain. The results suggest that C-fos may play a crucial role in the development of the hyperalgesia in the earlier-time of the neuropathic pain, but TrkA receptors may be involved in the long-lasting adaptive changes of the central pathway in neuropathic pain. 展开更多
关键词 chronic constriction injury innoxious stimulus HYPERALGESIA C-fos TrkA
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Stability of N-LTNR exposing to severe thermal stimulus 被引量:1
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作者 程俊 严楠 +1 位作者 叶耀坤 鲍丙亮 《Journal of Beijing Institute of Technology》 EI CAS 2016年第2期164-171,共8页
The thermal stability of normal lead styphnate( N-LTNR) has been studied under severe temperature(- 70 ℃- 130 ℃ for 5 days) with a high optical microscope and camera were used to observe apparent morphology and ... The thermal stability of normal lead styphnate( N-LTNR) has been studied under severe temperature(- 70 ℃- 130 ℃ for 5 days) with a high optical microscope and camera were used to observe apparent morphology and thermal gravimetric analysis was applied to study the physical changes. In addition,vacuum stability analysis,differential scanning calorimetry( DSC),thermal gravimetric analysis( TGA) and purity analysis were utilized to study the chemical changes. As well as flame sensitivity analysis were used to investigated the explosive changes. The results show that N-LTNR has good chemical stability and fire function stability between- 70 ℃ and 130 ℃,but poor physical stability. When the temperature was exceeded than 110 ℃,the N-LTNR lost crystal water which made the energetic material become darker in color,lager in volume and lighter in weight( 3. 416%) when the temperature was below- 40 ℃,the phenomenon of crystal broking and jumping happened. 展开更多
关键词 N-LTNR thermal stimulus failure analysis STABILITY
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Ultrafast Infrared Spectroscopic Study of Microscopic Structural Dynamics in pH Stimulus-Responsive Hydrogels 被引量:1
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作者 Jian Hong De-xia Zhou +2 位作者 Hong-xing Hao Min Zhao Hong-tao Bian 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2020年第5期540-546,I0078,共8页
Hydrogels show versatile properties and are of great interest in the fields of bioelectronics and tissue engineering.Understanding the dynamics of the water molecules trapped in the three-dimensional polymeric network... Hydrogels show versatile properties and are of great interest in the fields of bioelectronics and tissue engineering.Understanding the dynamics of the water molecules trapped in the three-dimensional polymeric networks of the hydrogels is crucial to elucidate their mechanical and swelling properties at the molecular level.In this report,the poly(DMAEMA-co-AA)hydrogels were synthesized and characterized by the macroscopic swelling measurements under different pH conditions.Furthermore,the microscopic structural dynamics of pH stimulus-responsive hydrogels were studied using FTIR and ultrafast IR spectroscopies from the viewpoint of the SCN-anionic solute as the local vibrational reporter.Ultrafast IR spectroscopic measurements showed the time constants of the vibrational population decay of SCN-were increased from 14±1 ps to 20±1 ps when the pH of the hydrogels varied from2.0 to 12.0.Rotational anisotropy measurements further revealed that the rotation of SCNanionic probe was restricted by the three-dimensional network formed in the hydrogels and the rotation of SCN-anionic probe cannot decay to zero especially at the pH of 7.0.These results are expected to provide a molecular-level understanding of the microscopic structure of the cross-linked polymeric network in the pH stimulus-responsive hydrogels. 展开更多
关键词 Ultrafast IR spectroscopy HYDROGEL pH stimulus responsive Structural dynamics
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Exogenous Protein as an Environmental Stimulus of Biofilm Formation in Select Bacterial Strains 被引量:1
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作者 Donna Ye Lekha Bapu +5 位作者 Mariane Mota Cavalcante Jesse Kato Maggie Lauria Sneideman Kim Scribner Thomas Loch Terence L. Marsh 《Advances in Microbiology》 2020年第3期123-144,共22页
A screening of environmental conditions that would elicit robust biofilm in a collection of Serratia marcescens isolated from soil revealed that exogenous milk protein increased biofilm productivity up to ten-fold. A ... A screening of environmental conditions that would elicit robust biofilm in a collection of Serratia marcescens isolated from soil revealed that exogenous milk protein increased biofilm productivity up to ten-fold. A select screening of fish pathogens, freshwater and human isolates identified several other species that responded similarly to exogenous protein. The optimal protein concentration was species specific;S. marcescens at 5% milk protein, Aeromonas sp. at 2% - 3%, Flavobacterium columnare at 1% and Pseudomonas aeruginosa at 0.1% - 0.4%. Media supplemented with milk protein also increased the cell counts in biofilm as well as the protein incorporated into the biofilm matrix. These data suggest that relatively high concentrations of exogenous protein may serve as an environmental trigger for biofilm formation, particularly for pathogenic bacteria exposed to relatively high concentrations of protein in bodily fluids and mucosal surfaces. 展开更多
关键词 Biofilm ENVIRONMENTAL stimulus EXOGENOUS Protein SERRATIA marcescens AEROMONAS sp. FLAVOBACTERIUM columnare
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Feather Vibration as a Stimulus for Sensing Incipient Separation in Falcon Diving Flight 被引量:1
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作者 Christoph Brücker Daniel Schlegel Michael Triep 《Natural Resources》 2016年第7期411-422,共12页
Based on our preceding studies on the aerodynamics of a falcoperegrinus in diving flight along a vertical dam it is known that even when the body shape of the bird is rather streamlined in V-shape some feathers tips m... Based on our preceding studies on the aerodynamics of a falcoperegrinus in diving flight along a vertical dam it is known that even when the body shape of the bird is rather streamlined in V-shape some feathers tips may elevate in certain regions of the body. These regions were identified in wind tunnel tests for typical diving flight conditions as regions of locally separated flow. A life-size model in V-shape of a falcoperegrinus with artificial feathers fixed along the body was studied in a wind tunnel to focus on the fluid-structure interaction of feathers located in this sector. The distal ends of the feathers show flow-induced vibrations at typical flight conditions which grow linear in amplitude with increasing angle of incidence until incipient separation. In light of the proven existence of vibration-sensitive mechanoreceptors in the follicles of secondary feathers in birds it is hypothesized that this linear amplitude response offers the bird to sense the angle of incidence during the diving flight using the vibration magnitude as sensory stimulus. Thus the bird in streamlined shape has still a good measure to control its attitude to be in the narrow window of safe angle of incidence. This might have implications also for other birds or technical applications of airfoil sensors regarding incipient separation detection. 展开更多
关键词 Falcon Dive Feather Vibration Sensory stimulus Incipient Separation
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Who Will Benefit from China’s Stimulus?
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作者 Robert Minikin 《China's Foreign Trade》 2012年第7期20-23,共4页
Asian exporters are losing another important growth driver, China, as a result of the slowdown in investment in China. Talk of
关键词 SLOWDOWN FISCAL stimulus CURRENCY package Thailand
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How the Brain Process Stimulus-Response Conflict? New Insights from Lateralized Readiness Potentials Scalp Topography and Reaction Times
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作者 Marc E. Lavoie Johannes E. A. Stauder 《Journal of Behavioral and Brain Science》 2013年第1期150-155,共6页
Stimulus-Response Compatibility (SRC) refers to the fact that some tasks are performed easier and better than others because of the way stimuli and responses are paired with each other. To assess the brain responses t... Stimulus-Response Compatibility (SRC) refers to the fact that some tasks are performed easier and better than others because of the way stimuli and responses are paired with each other. To assess the brain responses to stimulus-response conflicts, we investigated the behavioral (accuracy and Reaction Times: RTs) as well as the physiological response (Lateralized Readiness Potentials: LRP) modulations in a positional blocked and a conditional mixed design in twelve university students. Results revealed that the performance was less accurate and the RTs, as well as the LRP onset, were delayed under the mixed conditional design. A greater compatibility effect was also noted on accuracy, RTs and LRP onset latency in the mixed design. Consistent with these findings, smaller peak activation at fronto-central areas suggests that more selective inhibition is needed in a mixed design context. Despite a smaller activation, the topographical distribution is similar in both designs. These results indicate that the translation time between stimulus- and response codes are greater under the mixed instruction, while the similar LRP topography suggests that common neural structures underlie LRPs in response to both type of designs. 展开更多
关键词 Lateralized READINESS POTENTIALS Mixed-Blocked Designs stimulus Response-Compatibility Reaction Times
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MEASUREMENT OF AMPLITUDE AND DELAY OF STIMULUS FREQUENCY OTOACOUSTIC EMISSIONS
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作者 Tianying Ren Jiefu Zheng +1 位作者 Wenxuan He Alfred L. Nuttall 《Journal of Otology》 2013年第1期57-62,共6页
Although stimulus frequency otoacoustic emissions (SFOAEs) have been used as a non-invasive measure of cochlear mechanics, clinical and experimental application of SFOAEs has been limited by difficulties in accurately... Although stimulus frequency otoacoustic emissions (SFOAEs) have been used as a non-invasive measure of cochlear mechanics, clinical and experimental application of SFOAEs has been limited by difficulties in accurately deriving quantitative information from sound pressure measured in the ear canal. In this study, a novel signal processing method for multicomponent analysis (MCA) was used to measure the amplitude and delay of the SFOAE. This report shows the delay-frequency distribution of the SFOAE measured from the human ear. A low level acoustical suppressor near the probe tone significantly suppressed the SFOAE, strongly indicating that the SFOAE was generated at characteristic frequency locations. Information derived from this method may reveal more details of cochlear mechanics in the human ear. 展开更多
关键词 MEASUREMENT OF AMPLITUDE AND DELAY OF stimulus FREQUENCY OTOACOUSTIC EMISSIONS MCA SDC LDC Figure
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Stimulus 2009(Part Two)——Measures facilitate light & textile industry
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作者 Shang Lin’aiyi 《China Textile》 2009年第2期26-35,共10页
Support SMEs Increase the scale of financial supports at various levels to support SMEs, sustain light & textile projects with promising market prospect, notable driving of employment and remarkable social benefit... Support SMEs Increase the scale of financial supports at various levels to support SMEs, sustain light & textile projects with promising market prospect, notable driving of employment and remarkable social benefits, and step up investments in construction of credit guarantee system and service 展开更多
关键词 Part Two stimulus 2009 textile industry Measures facilitate light
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Whether “Buy American” Could Become “Bye America”——Trade Protection in the Stimulus Package
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作者 Elliot J. Feldman John J. Burke Michael S. Snarr 《China Textile》 2009年第5期22-26,共5页
Congress is working toward swift passage of economic stimulus legislation to jolt the U.S.economy out of a downward spiral.
关键词 Could Become Trade Protection in the stimulus Package WHETHER Buy American Bye America NAFTA
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Investment Stimulus
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作者 Liu Jian 《ChinAfrica》 2016年第9期46-47,共2页
LIMPOPO Province in the far north of South Africa takes its name from the mighty Limpopo River. which forms the natural border with Zimbabwe. It is a region teeming with wildlife, and bountiful historical and cultural... LIMPOPO Province in the far north of South Africa takes its name from the mighty Limpopo River. which forms the natural border with Zimbabwe. It is a region teeming with wildlife, and bountiful historical and cultural treasures, along with spectacular scenery, Now the province, and its northern-most town. Musina. are on the verge of bigger things. 展开更多
关键词 Investment stimulus ZHANG
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Stimulus 2009--beef up domestic demand
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作者 Shang Lin’aiyi 《China Textile》 2009年第1期22-32,共11页
The State Council conducted researches and deployed measures to further expand domestic demand to facilitate steadfast economic growth, as well as nailed down ten measures, which will invest in a total of RMB four tri... The State Council conducted researches and deployed measures to further expand domestic demand to facilitate steadfast economic growth, as well as nailed down ten measures, which will invest in a total of RMB four trillion Yuan till the end of 2010 to stimulate domestic demand. Following that, the State Council issued six policies and measures to promote sound development of the light industry and other industries, like textile industry. This enables us to see the determination and action of the government in combating the financial storm and developing the social economy. Meanwhile, it is a good news to the textile industry in unfavorable situation, which can be deemed as an unprecedented powerful policy supports. Absolutely, this will bring a opportunity to China's textile industry. Therefore, we pick out items closely interrelated to the textile industry from the "10+6" policy for elaboration, so as to work out how we shall take full advantage of the supports. Wherein, the ten measures to expand domestic demand do not directly target the textile industry, but they will, with the implementation of various policies and investments, surely drive domestic demand to grow, and contribute to the growth of textile industry. 展开更多
关键词 beef up domestic demand stimulus 2009
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Policy Stimulus Bears Fruit
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《ChinAfrica》 2018年第9期53-53,共1页
In the second quarter of 2018, the Chinese economy grew at 6.7 percent which is in line with expectations and marginally slower than the 6.8-percent growth recorded in the previous three quarters. Growth during the fi... In the second quarter of 2018, the Chinese economy grew at 6.7 percent which is in line with expectations and marginally slower than the 6.8-percent growth recorded in the previous three quarters. Growth during the first half this year also stands at 6.7 percent. Amidst the ongoing trade war with the United States, as of July 27, the renminbi (RMB) has fallen 8.2 percent against the dollar since April 2. Having fallen below 3,000 in June for the first time in two years. 展开更多
关键词 Policy stimulus Bears Fruit
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