Modeling and performance evaluation of a piezoelectric energy harvester with segmented electrodes

Hongyan Wang,Lihua Tang,Xiaobiao Shan,Tao Xie,Yaowen Yang 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.14 No.2

Conventional cantilevered piezoelectric energy harvesters (PEHs) are usually fabricated with continuous electrode configuration (CEC), which suffers from the electrical cancellation at higher vibration modes. Though previous research pointed out that the segmented electrode configuration (SEC) can address this issue, a comprehensive evaluation of the PEH with SEC has yet been reported. With the consideration of delivering power to a common load, the AC outputs from all segmented electrode pairs should be rectified to DC outputs separately. In such case, theoretical formulation for power estimation becomes challenging. This paper proposes a method based on equivalent circuit model (ECM) and circuit simulation to evaluate the performance of the PEH with SEC. First, the parameters of the multi-mode ECM are identified from theoretical analysis. The ECM is then established in SPICE software and validated by the theoretical model and finite element method (FEM) with resistive loads. Subsequently, the optimal performances with SEC and CEC are compared considering the practical DC interface circuit. A comprehensive evaluation of the advantageous performance with SEC is provided for the first time. The results demonstrate the feasibility of using SEC as a simple and effective means to improve the performance of a cantilevered PEH at a higher mode.

A Cross-National Study on the CEO Messages of Multinational Corporations in China

Lingmei Xie(시에 링메이),Hongyan Zhao(조홍연),JongWook, Kwon(권종욱) 한국경영학회 2016 한국경영학회 통합학술발표논문집 Vol.2016 No.8

CEO messages convey corporate culture and philosophy. In particular, communication with stakeholders through CEO messages of corporate web sites is an important strategic tool given that MNCs in foreign market should communicate with local stakeholders from different cultural and linguistic background. The purpose of this paper is to describe and interpret the CEO message of North American, Japanese and European multinational corporations (MNCs) in China. This study focuses on languages, word count, number of sentences, words per sentences and theme of the CEO’s message on website. The results from this study enhance our understanding how CEOs of MNCs communicate with their stakeholders in China and what content they mainly include in their messages on their web sites.

Transcriptome Analysis and Expression Profiling of Molecular Responses to Cd Toxicity in Morchella spongiola

( Xu Hongyan ),( Xie Zhanling ),( Jiang Hongchen ),( Guo Jing ),( Meng Qing ),( Zhao Yuan ),( Wang Xiaofang ) 한국균학회 2021 Mycobiology Vol.49 No.4

Morchella is a genus of fungi with the ability to concentrate Cd both in the fruit-body and mycelium. However, the molecular mechanisms conferring resistance to Cd stress in Morchella are unknown. Here, RNA-based transcriptomic sequencing was used to identify the genes and pathways involved in Cd tolerance in Morchella spongiola. 7444 differentially expressed genes (DEGs) were identified by cultivating M. spongiola in media containing 0.15, 0.90, or 1.50mg/L Cd²⁺. The DEGs were divided into six sub-clusters based on their global expression profiles. GO enrichment analysis indicated that numerous DEGs were associated with catalytic activity, cell cycle control, and the ribosome. KEGG enrichment analysis showed that the main pathways under Cd stress were MAPK signaling, oxidative phosphorylation, pyruvate metabolism, and propanoate metabolism. In addition, several DEGs encoding ion transporters, enzymatic/non-enzymatic antioxidants, and transcription factors were identified. Based on these results, a preliminary gene regulatory network was firstly proposed to illustrate the molecular mechanisms of Cd detoxification in M. spongiola. These results provide valuable insights into the Cd tolerance mechanism of M. spongiola and constitute a robust foundation for further studies on detoxification mechanisms in macrofungi that could potentially lead to the development of new and improved fungal bioremediation strategies.

Amygdalus Gummosity Disease and Management Practices

Bixia Xie,Sen Wang,Hongyan Du,Shaobin Yang 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Modeling and performance evaluation of a piezoelectric energy harvester with segmented electrodes

Wang, Hongyan,Tang, Lihua,Shan, Xiaobiao,Xie, Tao,Yang, Yaowen Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.14 No.2

Conventional cantilevered piezoelectric energy harvesters (PEHs) are usually fabricated with continuous electrode configuration (CEC), which suffers from the electrical cancellation at higher vibration modes. Though previous research pointed out that the segmented electrode configuration (SEC) can address this issue, a comprehensive evaluation of the PEH with SEC has yet been reported. With the consideration of delivering power to a common load, the AC outputs from all segmented electrode pairs should be rectified to DC outputs separately. In such case, theoretical formulation for power estimation becomes challenging. This paper proposes a method based on equivalent circuit model (ECM) and circuit simulation to evaluate the performance of the PEH with SEC. First, the parameters of the multi-mode ECM are identified from theoretical analysis. The ECM is then established in SPICE software and validated by the theoretical model and finite element method (FEM) with resistive loads. Subsequently, the optimal performances with SEC and CEC are compared considering the practical DC interface circuit. A comprehensive evaluation of the advantageous performance with SEC is provided for the first time. The results demonstrate the feasibility of using SEC as a simple and effective means to improve the performance of a cantilevered PEH at a higher mode.

A novel approach for the preparation of thermally stable cellulose nanocrystals via a sustainable FeCl3-catalyzed deep eutectic solvent treatment

Xianghao Yang,Hongxiang Xie,Zhufan Zou,Yang Zou,Wei Liu,Hongyan Lan,Xinxing Zhang,Youngsoo Bae,Chuanling Si 강원대학교 산림과학연구소 2018 강원대학교 산림과학연구소 학술대회 Vol.2018 No.09

Cellulose nanocrystals (CNCs) as building blocks were widely used to produce renewable and sustainable nanomaterials. CNCs are mainly produced by inorganic acid hydrolysis such as sulfuric, hydrochloric, nitric, phosphoric acids, etc. However, there are some drawbacks for inorganic acid hydrolysis such as harsh corrosion of equipment, severe environmental pollution, large water usage and so on. Herein, we reported a green and sustainable method for the preparation of CNCs via a one-step treatment based on a deep system solvent (DES) system of FeCl3-catalyzed choline chloride and oxalic acid dihydrate (F-DES). Due to its low melting point, this F-DES can be easily obtained at a lower temperature. Results shows that CNC samples (F-CNC) could be successfully isolated from bleached eucalyptus Kraft pulp (BEKP) with a high yield (over 70%). Also the DES could be recovered from the reaction solution by a simple evaporation process with high recovery rate ( %). Thermogravimetric analyses revealed that the onset decomposition temperature for the obtained F-CNC was 321°C, which was much higher than that of the CNCs produced from the same raw BEKP by sulfuric acid hydrolysis. Therefore, the FeCl3-catalyzed deep eutectic solvent treatment could be a sustainable and economically feasible method for the production of CNCs with high thermal stability.

Utilization of electrolytic manganese residue to synthesize zeolite A and zeolite X for Mn ions adsorption

Wenlei Li,Huixin Jin,Hongyan Xie,Duolun Wang,Ershuai Lei 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-

Extensive research is being carried out to efficiently utilize electrolytic manganese residue (EMR) andconvert it into useful materials. In this paper, phase pure zeolite A (ZA) and zeolite X (ZX) were synthesizedby EMR for the first time. The EMR-based zeolites were characterized by XRD, TG, SEM and BET, andtheir zero point charges were tested. Then, the adsorption capacities of ZA and ZX on Mn ions were studied. On the adsorbent concentration = 3.0 g/L and C0 = 439 mg/L, the adsorption capacities of ZA and ZX onMn ion were 119.5 and 96.7 mg/g, respectively. In addition, the adsorption kinetics and isotherms of theadsorption process were discussed, and the adsorption mechanism was clarified by means of XRD, FTIR,SEM, and XPS. The appearance of Mn-O functional groups indicated that Mn ions did enter the bindingsites of zeolites. Moreover, ZA and ZX were successfully regenerated in this work. Furthermore, the influenceof coexisting cations was explored, and the maximum adsorption capacities of ZA and ZX were comparedwith other adsorbents, which proved the excellent adsorption of Mn ions by ZA and ZX. Inconclusion, the synthesized ZA and ZX were low-cost adsorption materials with high adsorption capacity.

Preparation of Cellulose Nanocrystals via a Mild Mixed Acid Hydrolysis with High Yield and High Thermal Stability

Zhufan Zou,Xianghao Yang,Hongxiang Xie,Hongyan Lan,Yang Cheng,Jiahui Shen,Youngsoo Bae,Chuanling Si 강원대학교 산림과학연구소 2018 강원대학교 산림과학연구소 학술대회 Vol.2018 No.09

Cellulose nanocrystals (CNCs) are mainly produced by traditional mineral acid hydrolysis, such as sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, etc., which usually causes some problems such as corrosion of equipment, inability of acid recovery, large amounts of water usage, and over-degradation of cellulose. In this work, a green and sustainable approach for the preparation of CNCs was developed by using a mixed acid hydrolysis of oxalic acid and sulfuric acid. The acid ratio, reaction temperature, and reaction time were investigated in detail. It was discovered that a high yield up to 85 % was achieved by this mixed acid with a ratio of 5:1:4 for sulfuric acid: oxalic acid: H2O respectively at 95 oC for 2 h. Results showed that the resultant CNCs have a narrow particle size of 416±35 nm (based on dynamic light scattering). TEM characterization showed the CNCs was perfect whisker morphology. Also, the obtained CNCs exhibited superior dispersion stability in water due to the introduction of carboxyl group on the surface of CNCs by oxalate esterification. Thermogravimetric analyses revealed that the resultant CNCs showed a much higher thermal stability (315 °C) than the traditional sulfuric acid hydrolyzed CNCs. In addition, over 90% of oxalic acid could be recovered by a simple recrystallization step. Thus, the present work demonstrated an efficient and green preparation method of CNCs with high yield and high thermal stability.

Relationship between 18F-FDG PET/CT Semi-Quantitative Parameters and International Association for the Study of Lung Cancer, American Thoracic Society/European Respiratory Society Classification in Lung Adenocarcinomas

Bu Lihong,Tu Ning,Wang Ke,Zhou Ying,Xie Xinli,Han Xingmin,Lin Huiqin,Feng Hongyan 대한영상의학회 2022 Korean Journal of Radiology Vol.23 No.1

Objective: To investigate the relationship between 18F-FDG PET/CT semi-quantitative parameters and the International Association for the Study of Lung Cancer, American Thoracic Society/European Respiratory Society (IASLC/ATS/ERS) histopathologic classification, including histological subtypes, proliferation activity, and somatic mutations. Materials and Methods: This retrospective study included 419 patients (150 males, 269 females; median age, 59.0 years; age range, 23.0–84.0 years) who had undergone surgical removal of stage IA–IIIA lung adenocarcinoma and had preoperative PET/CT data of lung tumors. The maximum standardized uptake values (SUVmax), background-subtracted volume (BSV), and background-subtracted lesion activity (BSL) derived from PET/CT were measured. The IASLC/ATS/ERS subtypes, Ki67 score, and epidermal growth factor/anaplastic lymphoma kinase (EGFR/ALK) mutation status were evaluated. The PET/CT semiquantitative parameters were compared between the tumor subtypes using the Mann–Whitney U test or the Kruskal–Wallis test. The optimum cutoff values of the PET/CT semi-quantitative parameters for distinguishing the IASLC/ATS/ERS subtypes were calculated using receiver operating characteristic curve analysis. The correlation between the PET/CT semi-quantitative parameters and pathological parameters was analyzed using Spearman’s correlation. Statistical significance was set at p < 0.05. Results: SUVmax, BSV, and BSL values were significantly higher in invasive adenocarcinoma (IA) than in minimally IA (MIA), and the values were higher in MIA than in adenocarcinoma in situ (AIS) (all p < 0.05). Remarkably, an SUVmax of 0.90 and a BSL of 3.62 were shown to be the optimal cutoff values for differentiating MIA from AIS, manifesting as pure ground-glass nodules with 100% sensitivity and specificity. Metabolic-volumetric parameters (BSV and BSL) were better potential independent factors than metabolic parameters (SUVmax) in differentiating growth patterns. SUVmax and BSL, rather than BSV, were strongly or moderately correlated with Ki67 in most subtypes, except for the micropapillary and solid predominant groups. PET/CT parameters were not correlated with EGFR/ALK mutation status. Conclusion: As noninvasive surrogates, preoperative PET/CT semi-quantitative parameters could imply IASLC/ATS/ERS subtypes and Ki67 index and thus may contribute to improved management of precise surgery and postoperative adjuvant therapy.