搜索结果: 1-15 共查到“工学 ultrasonic”相关记录51条 . 查询时间(0.062 秒)
On the Phonetic Information in Ultrasonic Microphone Signals
Speech recognition ultrasonic multimodal
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2014/11/27
On the Phonetic Information in Ultrasonic Microphone Signals.
Ultrasonic Detection Algorithm Research on the Damage Depth of Concrete after Fire
Concrete Fire damage Damage depth Ultrasonic wave
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2014/4/10
To measure the depth of fire-damaged concrete by ultrasonic method, it was traditionally assumed that the concrete of the fire-damaged structural member could be simply classified into damaged layer a...
Aldol condensations of a variety of different aldehydes and ketones under ultrasonic irradiation using poly(N-vinylimidazole) as a new heterogeneous base catalyst under solvent-free conditions in a liquid-solid system Nader Ghaffari Khaligha, Taraneh Mihankhahb（图）
Ultrasound-assisted reaction Liquid-solid system Poly(N-vinylimidazole) Aldol condensation, Solvent-free
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2013/12/5
An ultrasound-assisted aldol condensation reaction has been developed for a range of ketones with a variety of aromatic aldehydes using poly(N-vinylimidazole) as a solid base catalyst in a liquid-soli...
Enhanced Sonocatalytic Degradation of Rhodamine B by Graphene-TiO2 Composites Synthesized by an Ultrasonic-Assisted Method（图）
grapheme ultrasonication sonocatalytic degradation adsorption rhodamine B
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2013/10/5
A series of graphene-TiO2 composites was fabricated from graphene oxide and titanium n-butoxide (TNB) by an ultrasonic-assisted method. The structure and composition of the nanocomposites were charact...
Ultrasonic Emulsification of Whey Protein Isolate-Stabilized Nanoemulsions Containing Omega-3 Oil from Plant Seed
Whey Protein Isolate-Stabilized Nanoemulsions Plant Seed
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2016/6/1
In this study, nanoemulsions containing omega-3 oil from Echium plantagineum seed and stabilized by Whey Protein Isolate (WPI) were prepared using ultrasonic emulsification technique. The ultrasonic p...
Ultrasonic Nondestructive Signals Processing Based on Matching Pursuit with Gabor Dictionary
ultrasonic signal processing sparse representation matching pursuit
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2011/8/4
The success of ultrasonic nondestructive testing technology depends not only on the generation and measurement of the desired waveform, but also on the signal processing of the measured waves.
Ultrasonic Nondestructive Signals Processing Based on Matching Pursuit with Gabor Dictionary
ultrasonic signal processing sparse representation matching pursuit
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2011/8/4
The success of ultrasonic nondestructive testing technology depends not only on the generation and measurement of the desired waveform, but also on the signal processing of the measured waves.
Temperature Dependence of Ultrasonic Longitudinal Guided Wave Propagation in Long Range Steel Strands
steel strand ultrasonic guided waves mode temperature coefficient
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2011/8/4
Ultrasonic guided wave inspection is an effective non-destructive testing method which can be used for stress level evaluation in steel strands. Unfortunately the propagation velocity of ultrasonic gu...
茶叶微波超声波耦合动态逆流浸提工艺（Combined Dynamic Countercurrent Extraction Technology with Microwave Ultrasonic-wave Extraction for Tea）
茶叶 微波 超声波 耦合 浸提
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2010/12/29
应用设计的微波超声波耦合动态逆流浸提机，以水为溶剂，茶鲜叶为原料，进行了茶叶有效成分的浸提试验。研究了浸提功率、料液比和浸提时间3因素对茶叶主要有效成分浸提率的影响，并通过L9(34)正交试验设计，对浸提工艺进行优化。结果显示，该设备的最佳浸提工艺参数为：浸提时间6min(微波)+6min(超声波)，料液比1∶20，浸提功率1.0kW(微波)+1.0kW(超声波)。茶多酚、氨基酸、咖啡碱的...
超声波预处理对燕麦蛋白制备ACE抑制肽的影响（Effect of Oat-seed Protein Pretreatment by Ultrasonic on Preparation of ACE Inhibitory Peptides）
燕麦蛋白 ACE抑制肽 超声波
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2010/12/29
利用燕麦蛋白制备ACE抑制肽时先利用超声波对燕麦蛋白原料进行预处理研究。以ACE抑制活性和水解度为指标，考察了超声波功率、处理时间、超声波工作/间歇时间对燕麦蛋白预处理效果的影响。结果表明，超声波预处理的最佳工艺参数为：超声波功率500W，处理时间20min，超声波工作时间2 s、间歇时间2 s，该条件下酶解产物对ACE的半抑制浓度IC50值从0.533mg/mL降到0.299mg/mL...
纤维素酶协同超声波辅助提取苦瓜多糖工艺优化（Optimization on Cellulase and Ultrasonic Wave Assisted Extraction Technology of Momordica charantia Polysaccharides）
苦瓜 多糖 纤维素酶 超声波
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2010/12/28
为了得到纤维素酶协同超声波法提取苦瓜多糖的最佳工艺条件，利用Box-Behnken的中心组合设计及响应面法（RSM）探讨了超声波功率、酶量、料液比、时间、pH值和温度等因素的优化组合，通过建立二次回归模型，确定其最佳提取工艺条件为: 超声波功率390W、纤维素酶量3500U/ g（酶活200U/mg以上）、料液比1∶38、时间40min、pH值5、温度56℃。在此工艺条件下，苦瓜多糖...
Nonlinearity analysis of piezoelectric micromachined ultrasonic transducers based on couple stress theory
piezoelectric micromachined ultrasonic transducer (pMUT) couple stress theory static deformation Nonlinearity analysis
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2012/2/24
This paper studies the static deformation behavior of a piezoelectric micromachined ultrasonic transducer (PMUT) actuated by a strong external electric field. The transducer membrane consists of a pie...
Ultrasonic beam steering using Neumann boundary condition in multiplysics
Ultrasonic beam steering Desired angle Line element time-delay
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2012/2/24
The traditional one-dimensional ultrasonic beam steering has time delay and is thus a complicated problem. A numerical model of ultrasonic beam steering using Neumann boundary condition in multiplysic...
Performance Test of an Inertial Fibrous Filter for Ultrafine Particle Collection and the Possible Sulfate Loss when Using an Aluminum Substrate with Ultrasonic Extraction of Ionic Compounds
Inertial classification Ultrafine particles (PM0.1) nano-MOUDI Sulfate loss Aluminum substrate
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2016/3/29
A sampler using inertial fibrous filters (INF) has been recently developed for ultrafine particle collection by impaction
and filtration. This new sampler has a low pressure drop (20–30 kPa) and can ...
Ultrasonic Signal Characteristics in Pre- and Post-yield Steel Structures
Ultrasonic Signal Characteristics Steel Structures
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2010/3/5
The theory of acoustoelasticity has been the main concept behind most studies investigating the stress level in different structural materials. In this paper, an alternative approach for stress assess...