Influences of Solution pH and Redox Potential on the Bioleaching of LiCoO2 from Spent Lithium-ion Batteries

Lei Li,Gui-sheng Zeng,Shenglian Luo,Xiao-rong Deng,Qing-ji Xie 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.2

The influences of solution pH and redox potential on bioleaching of LiCoO2 from spent lithium-ion batteries using Acidithiobacillus ferrooxidans were investigated. Bioleaching at different initial pH and ferrous ion (Fe2+) concentrations were carried out, and electrochemical behavior of LiCoO2 dissolution was examined to study the effect of solution redox potential on the bioleaching process. The results showed maximum cobalt dissolution at initial pH of 1.5 and initial Fe2+ concentration of 35 g/L, and cobalt dissolution showed only slight relationship with pH of solution. Nonetheless, there was improvement of cobalt dissolution at higher redox potential. The cyclic voltammograms showed that dissolution rates increase when the solution potentials are higher than 0.4 V, and rapid decrease at 1.3 V. The anodic polarization curves indicated that the corrosion, primary passive, and passivation potentials were 0.420, 0.776 and 0.802 V, respectively.

Study on the micro-scale simulation of wind field over complex terrain by RAMS/FLUENT modeling system

Lei Li,Li-Jie Zhang,Ning Zhang,Fei Hu,Yin Jiang,Chun-Yi Xuan,Wei-Mei Jiang 한국풍공학회 2010 Wind and Structures, An International Journal (WAS Vol.13 No.6

A meteorological model, RAMS, and a commercial computational fluid dynamics (CFD) model, FLUENT are combined as a one-way off-line nested modeling system, namely, RAMS/FLUENT system. The system is experimentally applied in the wind simulation over a complex terrain, with which numerical simulations of wind field over Foyeding weather station located in the northwest mountainous area of Beijing metropolis are performed. The results show that the method of combining a meteorological model and a CFD model as a modeling system is reasonable. In RAMS/FLUENT system, more realistic boundary conditions are provided for FLUENT rather than idealized vertical wind profiles, and the finite volume method (FVM) of FLUENT ensures the capability of the modeling system on describing complex terrain in the simulation. Thus, RAMS/FLUENT can provide fine-scale realistic wind data over complex terrains.

Novel Buck Mode Three-Level Direct AC Converter with a High Frequency Link

Lei Li,Yue Guan,Kunshan Gong,Guangqiang Li,Jian Guo 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

A novel family of Buck mode three-level direct ac converters with a high frequency link is proposed. These converters can transfer an unsteady high ac voltage with distortion into a regulated sinusoidal voltage with a low THD at the same frequency. The circuit configuration is constituted of a three-level converter, high frequency transformer, cycloconverter, as well as input and output filters. The topological family includes forward, push-pull, half-bridge, and full-bridge modes. In order to achieve a reliable three-level ac-ac conversion, and to overcome the surge voltage and surge current of the cycloconverter, a phase-shifted control strategy is introduced in this paper. A prototype is presented with experimental results to demonstrate that the proposed converters have five advantages including high frequency electrical isolation, lower voltage stress of the power switches, bi-directional power flow, low THD of the output voltage, and a higher input power factor.

ADDRESSING FOOD WASTE: AN EXPLORATION OF INGREDIENT SCHEMA INCONGRUITY OF UPCYCLED FOODS

Lei Li,Yalda Fadaeiresketi,Ernest Kwan,Irene R. R. Lu 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07

Food waste is a critical problem for many countries. Food producers and groceries often discard imperfect foods or food by-products that still contain nutritional value. To address this problem, some food manufacturers have turned to upcycling, that is, to convert otherwise discarded ingredients into new food products (e.g., cacao fruit pulp into crunch bites). Consumers’ acceptance of sustainable products is generally lower than that of conventional products due to quality concerns. We speculate that for upcycled food products, consumers’ perception of product quality may vary when different percentages of imperfect ingredients are integrated into the products. Drawing from schema congruity theory, this research examines how the usage of imperfect ingredients can impact the perceived quality of upcycled food products. The implications for marketing upcycled foods are discussed.

Purification efficiency of eight aquatic plant species in an artificial floating island system in relation to extracellular enzyme activity and microbial community

Lei Li,You Feng,Jinye Li,Qing Li,Ting Liu,Qingfeng Chen 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.6

The floating island system exploits the combination of aquatic plants, microorganisms, and extracellular enzymes to purify wastewater. We investigated the purification efficiency of eight aquatic plant species cultured in wastewater. The relationships of plant purification capacity with extracellular enzyme activity and microbial community were analyzed to explore the crucial factors that affect the plant purification capacity and the mechanism of pollutants removal in different plant systems. Three plant species, namely Oenanthe javanica, Thalia dealbata, and lris pseudacorus, were most effective for purification of ammonium-nitrogen (NH₄<SUP>+</SUP>-N), total phosphate (TP), and chemical oxygen demand (COD) with maximum efficiencies of 76.09, 85.87, and 89.10%, respectively. Urease, alkaline phosphatase (AP), and β-glucosidase activities were significantly and positively correlated with root system development (P < 0.05). Activities of urease and AP were positively correlated with NH₄<SUP>+</SUP>-N and TP removal, respectively. The magnitude of urease and AP activity was generally consistent with the plant’s capacity to remove NH₄<SUP>+</SUP>-N and TP. β-Glucosidase activity and COD removal were not significantly correlated. The dominant microbial phylum in each species treatment was Proteobacteria. Alphaproteobacteria and Bacteroidia showed > 1% relative abundance and greater involvement in degradation of pollutants in the experimental system.

Clinical application of sartorius tendon transposition during radical vulvectomy: a case control study of 58 cases at a single institution

Lei Li,Xinxin Kou,Xiaojie Feng,Fenghua Liu,Hongtu Chao,Liying Wang 대한부인종양학회 2015 Journal of Gynecologic Oncology Vol.26 No.4

Objective: The aim of this study was to investigate the clinical effects of sartorius tendon transposition versus sartorius transposition during bilateral inguinal lymphadenectomy of radical vulvectomy. Methods: A total of 58 vulvar cancer patients who had surgery from May 2007 to October 2013, in which 30 patients received sartorius transposition and 28 patients received sartorius tendon transposition. All patients were matched by age, body mass index, stage, histology, and grade. Intraoperative variables and postoperative complications, recurrence, progression-free survival (PFS), and overall survival (OS) and postoperative life quality were compared and analyzed. Results: No significant differences were found at median surgical times and amounts of bleeding (p=0.316 and p=0.249, respectively), neither at the incidences of groin cellulitis and lymphocele (p=0.673 and p=0.473, respectively), but the recovery times of the inguinal wounds were shorter (p=0.026) and the incidences of wound break and chronic lymphedema were significantly decreased in the tendon transposition group (p=0.012 and p=0.022, respectively). Postoperative quality of life in tendon transposition group was significantly improved as indicated by the EORTC QLQ-C30 questionnaire. Recurrences were similar (p=0.346) and no significant differences were found at PFS and OS (p=0.990 and p=0.683, respectively). Conclusion: Compared to sartorius transposition, sartorius tendon transposition during inguinal lymphadenectomy led to improved patient recovery, reduced postoperative complications, and improved life quality without compromising the outcomes.

125I Seed Permanent Implantation as a Palliative Treatment for Stage III and IV Hypopharyngeal Carcinoma

Lei Li,Jie Yang,Xiaojiang Li,Xiaoli Wang,Yanxin Ren,Jimin Fei,Yan Xi,Ruimei Sun,Jing Ma 대한이비인후과학회 2016 Clinical and Experimental Otorhinolaryngology Vol.9 No.3

Objectives. The aim of this study was to investigate the feasibility and safety of percutaneous 125I seed permanent implantation for advanced hypopharyngeal carcinoma from toxicity, tumor response, and short-term outcome. Methods. 125I seeds implant procedures were performed under computed tomography for 34 patients with advanced hypopharyngeal carcinoma. We observed the local control rate, overall survival, and acute or late toxicity rate. Results. In the 34 patients (stage III, n=6; stage IV, n=28), the sites of origin were pyriform sinus (n=29) and postcricoid area (n=5). All patients also received one to four cycles of chemotherapy after seed implantation. The post-plan showed that the actuarial D90 of 125I seeds ranged from 90 to 158 Gy (median, 127 Gy). The mean follow-up was 12.3 months (range, 3.4 to 43.2 months). The local control was 2.1–31.0 months with a median of 17.7 months (95% confidence interval [CI], 13.4 to 22.0 months). The 1-, 2-, and 3-year local controls were 65.3%, 28.6%, and 9.5% respectively. Twelve patients (35%) died of local recurrence, fourteen patients (41%) died of distant metastases, and three patients (9%) died of recurrence and metastases at the same time. Five patients (15%) still survived to follow-up. At the time of analysis, the median survival time was 12.5 months (95% CI, 9.5 to 15.4 months). The 1-, 2-, and 3-year overall survival rates were 55.2%, 20.3%, and 10.9%, respectively. Five patients (15%) experienced grade 3 toxic events and nine patients (26%) have experienced grade 2 toxic events. Conclusion. This review shows relatively low toxicity for interstitial 125I seed implantation in the patients with advanced stage hypopharyngeal cancer. The high local control results suggest that 125I seed brachytherapy implant as a salvage or palliative treatment for advanced hypopharyngeal carcinoma merit further investigation.

A QSAR Model for Predicting the Anti HIV-1 Activity of TIBO Derivatives Using the Norm Indexes

Lei Li,Fangyou Yan,Xiangying Xu,Qingzhu Jia,Qiang Wang,Peisheng Ma 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.6

As non-nucleoside reverse transcriptase inhibitors, tetrahydroimidazo [4,5,1-jk][1, 4] benzodiazepinone (TIBO) derivatives play an important role in treating acquired immunodeficiency syndrome (AIDS). The activities (The 50% antiviral inhibitory concentration, pIC50) of a series of HIV reverse transcriptase inhibitor TIBO derivatives were modeled by the quantitative structure-activity relationship (QSAR) method. Based on the norm indexes proposed by our group, a multiple linear regression (MLR) model was developed to estimate the pIC 50 of anti HIV-1 activity of TIBO derivatives. The squared correlation coefficients for training set (R 2 train) and test set (R 2 test) are 0.911 and 0.913, respectively. The average absolute relative deviation (ARD) and overall average absolute error (AAE) are 5.78% and 0.330, respectively. Comparison results with other references demonstrated that this norm-based model was efficient and could provide satisfying prediction results.

An Extensive Review on Recent Deep Learning Applications

Lei Li 사단법인 미래융합기술연구학회 2019 아시아태평양융합연구교류논문지 Vol.5 No.3

Artificial Intelligence and its related technologies like Machine learning and deep learning are getting the momentum very fast in the recent days. The development of these technologies was very fast compared to other technologies. The usage of such technologies in research and other technologies was growing more and more. By the implementation of such technologies, the development of the gadgets and other applications which were already existed in the market are becoming more and more sophisticated and more human friendly for usage. The mobile phones are getting smarter and the utility of such devices are getting increased in a notable number. Now days, the people can be able to process the applications and other tasks very easily with the help of these advanced technologies. These technologies are getting more and more advanced as the artificial neural networks concept is using highly in these models. Hence, in the current paper, some of the important applications in which the deep learning and other related techniques and methods are being used today.

Online Mean Kernel Learning for Object Tracking

Lei Li,Ruiting Zhang,Jiangming Kan,Wenbin Li 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.11

Features for representing the target are the fundamental ingredient when constructing the appearance model in the tracking problem. Only one type of features is utilized to represent the target in most current algorithms. However, the limited representation of a single feature might not resist all appearance changes of the target during the tracking process. To cope with this problem, we propose a novel tracking algorithm - Mean Kernel Tracker (MKT) - to robustly locate the object. The MKT combines three complementary features - Color, HOG (Histogram of Oriented Gradient) and LBP (Local Binary Pattern) - to represent the target. And Extensive experiments on public benchmark sequences show MKT performs favorably against several state-of-the-art algorithms.