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Capillary effect-based selective sealing strategy for increasing piezoelectric MEMS speaker performance

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Microsystems & Nanoengineering 2024年第4期10卷 329-341页

作者： Yan Wang Tunan Lv Junning Zhang hongbin yu School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory WuhanHubei 430074China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

To address the serious acoustic performance deterioration induced by air leakage in the low-frequency range and the asynchronous vibration in electroacoustic transduction structures near the resonant frequency,a novel sealing strategy is proposed that targets one of the most widely reported piezoelectric MEMS speaker *** design consists of multiple cantilever beams,in which the air gaps between cantilevers are automatically and selectively filled with liquid polydimethylsiloxane(PDMS)via the capillary effect,followed by *** the proof-of-concept demonstration,the sound pressure level(SPL)within the frequency range lower than 100 Hz markedly increased after sealing in an experiment using an IEC ear ***,the SPL is increased by 4.9 dB at 20 Hz for a 40 Vpp driving ***,the deteriorated SPL response near the resonant frequencies of the cantilever beams(18 kHz–19 kHz)caused by their asynchronous vibration induced by the fabrication process nonuniformity also significantly improved,which successfully increased the SPL to approximately 17.5 ***,sealed devices feature nearly the same SPL response as the initial counterpart in the frequency band from 100 Hz to 16 kHz and a total harmonic distortion(THD)of 0.728%at 1 kHz for a 40 Vpp driving *** with existing sealing methods,the current approach offers easy operation,low damage risk,excellent repeatability/reliability and excellent robustness advantages and provides a promising technical solution for MEMS acoustic devices.

关键词： sealing piezoelectric effect

Energy management with dual droop plus frequency dividing coordinated control strategy for electric vehicle applications

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Journal of Modern Power Systems and Clean Energy 2015年第2期3卷 212-220页

作者： Wuhua LI Chi XU hongbin yu yunjie GU Xiangning HE Zhejiang University Hangzhou 310027China

In this paper,a dual droop-frequency diving coordinated control strategy is proposed for electric vehicle(EV)applications,where the hybrid energy storage system(HESS)with supercapacitors and batteries is integrated to prolong the life time of storage *** dynamic power allocation between the supercapacitor and batteries are obtained through the voltage cascaded control,upon which the high and low frequency power fluctuation are absorbed by the supercapacitors and batteries respectively to fully exploit the advantages of the supercapacitors and ***,the power capacity is scaled up by connecting storage blocks in parallel.A dual droop control scheme for parallel-connected energy storage system and its operation principle is introduced on the aspect of current sharing characteristic and state-of-charging(SOC)*** detailed analysis and formula derivation,the corresponding loop parameters are *** this control method,the current sharing performance is ensured and each block makes the self-adaptive adjustment according to their ***,the load power can be shared effectively,which helps to avoid the over-charge/over-discharge operation and contributes to the life cycle of the energy storage *** module is autonomous controlled without the necessity of communication,which is easy,economic and effective to ***,the simulation and experimental results are exhibited to verify the effectiveness of the proposed control scheme.

关键词： Dual droop control Frequency diving coordinated control Hybrid energy storage system Electric vehicle

Construction technology on pile foundation of No.6 main pier in Dashengguan Yangtze Bridge

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Frontiers of Structural and Civil Engineering 2009年第3期3卷 339-343页

作者： hongbin yu Zeping LIAN Jinling Institute of Technology Nanjing 210001China Headquarter of Building DA Sheng-guan Bridge Nanjing 210000China

Based on pile foundation construction of No.6 main pier,deep mudstone geological foundation and deep-water construction in Nanjing-Dashengguan Yangtze Bridge,the method of super-large-diameter bored pile in deep water is *** spread drill,application of PHP mud,and choice of machine are solved by adopting two machines of KTY4000 and ***,the airlift reversing circulation is selected in slag *** results show that this method can ensure successfully the construction of pier foundation to satisfy the demands of codes.

关键词： PHP slurry KTY4000 drilling machine KPG3000A drilling machine spread drill

Effects of ethanol extracts of scorpion on hippocampal apoptosis and caspase-3 expression in lithium chloride-pilocarpine-induced status epilepticus rats

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Neural Regeneration Research 2010年第2期5卷 118-125页

作者： Liang yu hongbin Sun Yi Liang Yan Xie Baoming He Fei Xu Department of Neurology Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital Chengdu 610072 Sichuan Province China

BACKGROUND： Previous studies have demonstrated that scorpion venom in the scorpion can inhibit epilepsy and apoptosis. However, it remains unclear whether ethanol extracts of scorpion （EES） exhibit similar effects. OBJECTIVE： To investigate the effects of EES on hippocampal apoptosis and caspase-3 expression, and to compare the effects on sodium valproate （positive control drug） in a rat model of status epilepticus induced by lithium chloride-pilocarpine. DESIGN, TIME AND SETTING： This randomized, controlled study was conducted at the Drug Research and Development Center, Kanghong Pharmaceuticals Group, and the Department of Pathology, Sichuan Academy of Medical Sciences ＆ Sichuan Provincial People＇s Hospital, China from May 2007 to April 2008. MATERIALS： EES were prepared by Huashen Pharmaceutical, China. Sodium valproate （Hunan Xiangzhong Pharmaceutical, China） and lithium chloride-pilocarpine （Sigma, USA） were also used in the present study. METHODS： From a total of 156 rats, six served as normal controls. The remaining rats were intraperitoneally injected with lithium chloride-pilocarpine to establish status epileptlcus models, and then assigned to five groups （n = 30, respectively）. Animals in each group were administered drugs at 15 minutes after epileptic seizure by gavage, i.e. in the normal control and model groups, rats were treated with 1 mL/0.1 kg saline. The sodium valproate group was administered 120 mg/kg/d sodium valproate. The low-, moderate-, and high-dose EES groups received treatments of 290, 580 and 1 160 mg/kg/d EES. The dispensed concentration was 1 mL/0.1 kg. Rat seizure behavior was observed. If status epilepticus did not terminated after 1 hour, the rats were intraperitoneally administered atropine （1 mg/kg） and diazepam （10 mg/kg） to terminate seizure. These rats were continuously observed for 6 hours to ensure seizure termination. Then rats were treated with the above-mentioned drugs at 8：00 am each day until sacrifice, which took place 4

关键词： ethanol extracts of scorpion apoptosis terminal dUTP nick-end labeling caspase-3 model of status epilepticus lithium chloride-pilocarpine brain injury neural regeneration

A method for Absolute Protein Expression Quantity Measurement Employing Insulator RiboJ

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Engineering 2018年第6期4卷 881-887页

作者： hongbin yu Zheng Wang Hanyue Xu Jiusi Guo Qingge Ma Xiangxu Mu yunzi Luo West China Medical Center Team for International Genetically Engineered Machine Competition 2017 West China School of Medicine/West China HospitalSichuan UniversityChengdu 610041China Department of Gastroenterology West China HospitalSichuan University and Collaborative Innovation Center of BiotherapyChengdu 610041China West China School of Stomatology West China HospitalSichuan UniversityChengdu 610041China College of Physical Science and Technology Sichuan UniversityChengdu 610064China

Measuring the absolute protein expression quantity for a specific promoter is necessary in the fields of both molecular biology and synthetic *** strength of a promoter is traditionally characterized by measuring the fluorescent intensity of the fluorescent protein downstream of the *** now,measurement of the absolute protein expression quantity for a promoter,however,has been unsuccessful in synthetic *** fact that the protein coding sequence influences the expression level for different proteins,and the inconvenience of measuring the absolute protein expression level,present a challenge to absolute quantitative ***,we introduce a new method that combines the insulator RiboJ with the standard fluorescence curve in order to measure the absolute protein expression quantity quickly;this method has been validated by modeling *** this method,we successfully measured nine constitutive promoters in the Anderson promoter *** method provides data with higher accuracy for pathway design and is a straightforward way to standardize the strength of different promoters.

关键词： RiboJ Promoter measurement Synthetic biology

Comparing Polyethersulfone and Polyurethane-immobilized Cells of Comamonas testosteroni QYY in Treatment of an Accidental Dye Wastewater

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Chemical Research in Chinese Universities 2017年第1期33卷 36-43页

作者： GENG Zhi yu Yang ZHU Suiyi yu hongbin LIU Jiancong BIAN Dejun YANG Xia HUO Hongliang HUO Mingxin Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection Northeast Normal University Changehun 130117 P. R. China Jilin Key Laboratory for Municipal Wastewater Treatment Changchun Institute of Technology Changchun 130012 P. R. China Biorefining Research Institute Lakehead University Thunder Bay P7B 5El Canada

Well-channeled porous polyethersulfone（PES） beads were synthesized and used for the immobilization of Comamonas testosteroni QYY cells for an aerobic reactor to remove quinoline, phenol, and other refractory com- pounds in accidentally-released dye wastewater supplemented with domestic wastewater. The pore size in PES beads mainly depended on the dripping time through the Water vapor cylinder. When the cylinder was 2.5 m in length, the pore size in the obtained beads was enlarged to 3 ~m, which provided an ideal surface for cells to pass through and grow inside. The reactor with the immobilized C. testosteroni QYY on PES beads resisted organic loading shock and enhanced total organic carbon（TOC） removal, which had 100% removal efficiencies of both quinoline and phenol when the volume ratio of the accidental wastewater to domestic wastewater was increased from 1：2 to 1：1, as compared with the 100% and 34.7% removal efficiencies by the reactor with immobilized C. testosteroni QYY on polyttrethane（PU） cube or the 82% and 2.4% removal efficiencies by the reactor with only the suspended C. testosteroni QYY cells, respectively. The PES beads had a specific surface area of 1843 cm2/cm3, which had immobilized （0.0244-0.003） g of C, testosteroni QYY cell dry mass/cm3, compared with the specific surface area of 564 cm2/cm3 of the PU cube with （0.0184-0.002） g of cell dry mass/cm3. The kinetic study revealed that the quinoline and phenol degradation followed zero-order reactions for all the three reactors. The PES reactor demonstrated the highest quinoline and phenol removal efficiencies. The immobilized C. testosteroni QYY on the low-cost inert PES beads demonstrated good shock resistance and was able to completely remove the toxic compounds, including phenyl carbamate, 2-nitrotoluene, and dioctyl phthalate. Therefore, the beads were ideal for large-scale accidental wastewater treatment.

关键词： Accidental dye wastewater Comamonas testosteroni QYY Immobilization Porous polyether sulfone bead Biodegradation

Recycling of Mud Derived from Backwash Wastewater Coagulation as Magnetic Sodalite Sphere for Zn^(2+) Adsorption

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Journal of Renewable Materials 2021年第9期9卷 1599-1607页

作者： Suiyi Zhu Manhong Ji hongbin yu Zhan Qu Jiakuan Yang Mingxin Huo Yi Wang School of Environment Northeast Normal UniversityChangchun130024China School of Environmental Science&Engineering Huazhong University of Science and TechnologyWuhan430074China

Herein,we reported a method to prepare magnetic sodalite sphere by using the mud from backwash wastewater after polyaluminum chloride(PAC)*** results showed that approximately 100%of Fe in the wastewater was precipitated as flocculent iron mud(FM)by adding *** was converted to spherical magnetic sodalite(FMP)with a diameter of 3μm via a facile alkali hydrothermal method without adding Al/Si resources or *** product FMP had the saturated magnetization of 10.9 emu g^(-1) and high Zn^(2+)adsorption capacity of 50.6 mg g^(-1).Without coagulation with PAC,the removal rate of Fe from the wastewater was only 92.7%,and the precipitated mud(RM)was converted to irregular particles(RMP),which had weak magnetic response and low capacity of Zn^(2+)adsorption comparing with *** the method,the Fe in backwash wastewater was effectively recycled,and the generated sludge was converted to well-formed sodalite sphere without generating any secondary waste.

关键词： Backwash wastewater coagulation magnetic sodalite Mössbauer adsorption

Scorpion ethanol extract and valproic acid effects on hippocampal glial fibrillary acidic protein expression in a rat model of chronic-kindling epilepsy induced by lithium chloride-pilocarpine

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Neural Regeneration Research 2012年第6期7卷 426-433页

作者： Yi Liang hongbin Sun Liang yu Baoming He Yan Xie Department of Neurology Sichuan Academy of Medical Sciences ＆ Sichuan Provincial People＇s Hospital Chengdu 610072 SichuanProvince China

The present study analyzed the effects of ethanol extracts of scorpion on epilepsy prevention and hippocampal expression of glial fibrillary acidic protein in a lithium chloride-pilocarpine epileptic rat model. Results were subsequently compared with valproic acid. Results showed gradually- increased hippocampal glial fibrillary acidic protein expression following model establishment; glial fibrillary acidic protein mRNA expression was significantly increased at 3 days, reached a peak at 7 days, and then gradually decreased thereafter. Ethanol extracts of scorpion doses of 580 and 1 160 mg/kg, as well as 120 mg/kg valproic acid, led to a decreased number of glial fibrillary acidic protein-positive cells and glial fibrillary acidic protein mRNA expression, as well as decreased seizure grades and frequency of spontaneously recurrent seizures. The effects of 1 160 mg/kg ethanol extracts of scorpion were equal to those of 120 mg/kg valproic acid. These results suggested that the anti-epileptic effect of ethanol extracts of scorpion were associated with decreased hippocampal glial fibrillary acidic protein expression in a rat model of lithium chlofide-pilocarpine induced epilepsy.

关键词： Chinese herbs epilepsy glial fibrillary acidic protein lithium chloride-pilocarpine scorpion ethanol extraction valproic acid

Effect of Magnetic Field Configuration on Stray-Crystal Formation with Different Platform Sizes during Directional Solidification of Single-Crystal Superalloy

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 904-914页

作者： Keke Lu Congjiang Zhang Xiaotan yuan hongbin yu Weili Ren Biao Ding Haibiao Lu yunbo Zhong Zuosheng Lei Hui Wang Qiuliang Wang Peter KLiaw Xuezhi Qin Lanzhang Zhou State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgyShanghai UniversityShanghai 200444China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The magnetic field is an effective means to control the solidification structure and the defects of metal and semiconductor *** work investigates the effects of Cusp magnetic field(CMF)and longitudinal magnetic field(LMF)on the stray-crystal formation in the platform regions during the directional solidification of single-crystal superalloy with the different cross section *** application of CMF reduces the formation of platform stray-crystal,while LMF increases its *** the platform size increases,the stray-crystal ratio increases regardless of whether the magnetic fields are applied or not,the effectiveness of CMF increases,while that of LMF *** reason that the effects of CMF and LMF on the platform stray-crystal formation could be attributed to the change of flow structure from the distribution characteristics of the thermoelectric magnetic force and the magnetic damping force near the liquid-solid interface.

关键词： Stray-crystal Magnetic field Single-crystal superalloy Cross section change Directional solidification