Co3(PO4)2-Coated LiV3O8 as Positive Materials for Rechargeable Lithium Batteries

Ling-Ling Xie,Li-Qin You,Xiao-Yu Cao,Chao-Feng Zhang,Da-Wei Song,Ling-Bo Qu 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.4

Co3(PO4)2-coated LiV3O8 has been successfully synthesized and used as positive material for rechargeable lithium batteries by a facile liquid phase method. The as-prepared powders were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and the galvanostatic discharge/charge experiments. As-prepared Co3(PO4)2-coated LiV3O8 forms a good layered structure with a poor cyrstallinity. SEM reveals that Co3(PO4)2-coated LiV3O8 has uniform particle distribution and reduced particle size when compared with bare one. The Co3(PO4)2 coating layer is about 33 - 59 nm forming a continuous lumps attached to LiV3O8 particle surface. Co3(PO4)2-coated LiV3O8 electrode shows increased capacity and more stable cycling. The first and 35th discharge capacities of the Co3(PO4)2-coated LiV3O8electrode are 322.8 mAh g−1 and 235.7 mAh g−1 in the range of 4.0 - 1.8 V at a current rate of 30 mA g−1, respectively. The improved electrochemical performance is assigned to the greatly reduced LiV3O8 particle with uniform morphology. Co3(PO4)2-coating further benefits the phase transitions of LiV3O8 during discharge/charge while preventing parasite reactions between electrode surface and electrolyte.

Association Between the XRCC3 Thr241Met Polymorphism and Cervical Cancer Risk: a Meta-analysis

Qin, Ling-Yan,Chen, Xu,Li, Ping,Yang, Zheng,Mo, Wu-Ning Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11

Background: Numerous epidemiological studies have been conducted to evaluate the association between variants of the DNA repair gene XRCC3 and cancer risk. Here we focused on one XRCC3 polymorphism and development of cervical cancer, performing a meta-analysis. Methods: The pooled association between the XRCC3 Thr241Met polymorphism and cervical cancer risk was assessed by odds ratios (ORs) and their 95% confidence intervals (95%CIs). Results: A total of 5 case-control studies met the inclusion criteria. The pooled ORs for the total included studies showed no association among homozygotes TT vs. CC: OR=1.93, 95%CI=0.68-5.49, P=0.22; dominant model TT+TC vs. CC: OR=1.37, 95%CI=0.90-2.06, P=0.14; and recessive model TT vs. TC+CC: OR=1.76, 95%CI=0.68-4.55, P=0.25, but might be a slight risk factor for cervical cancer in heterozygote contrast TT vs. CT: OR= 1.33, 95%CI=1.04-1.71, P=0.02. In subgroup analysis, significant associations were found for Asians under all genetic models. Conclusions: Our meta-analysis suggested the XRCC3 Thr241Met polymorphism might not act as a cervical cancer risk factor overall. However, in subgroup analysis, a significant association was found in Asians under all genetic models. The association should be studied with a larger, stratified population, especially for Asians.

The CCND1 G870A Gene Polymorphism and Leukemia or Non-Hodgkin Lymphoma Risk: a Meta-analysis

Qin, Ling-Yan,Zhao, Li-Gang,Chen, Xu,Yang, Zheng,Mo, Wu-Ning Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.16

In recent years, mounting evidence has indicated that the CCND1 G870A gene polymorphism, which impacts the mitotic cell cycle, may influence leukemia or non-Hodgkin lymphoma risk. Unfortunately, the previous results were inconsistent. Therefore, a meta-analysis was performed to obtain a more precise estimation of any association. We conducted a search in PubMed, Embase and CNKI covering all published papers up to March, 2014. A total of 9 publications including 10 case-control studies met the inclusion criteria. Odds ratios (ORs) and their 95% confidence intervals (95%CIs) were applied to assess association. The pooled ORs showed significant association in non-Hodgkin lymphoma (comparison A vs G: OR= 1.114, 95%CI=1.053-1.179, p=0.000; homozygote comparison AA vs GG: OR=1.245, 95%CI=1.110-1.396, p=0.000; heterozygote comparison AG vs GG: OR=1.095, 95%CI=1.000-1.199, p=0.05; dominant model AA/GA vs GG: OR=1.137, 95%CI=1.043-1.239, p=0.003; and recessive model AA vs GA/GG: OR=1.177, 95%CI=1.066-1.301, p=0.001). However, there was no association between the CCND1 G870A polymorphism and leukemia risk. In conclusion, the CCND1 G870A polymorphism may increase risk of non-Hodgkin lymphoma, but not leukemia. However, more primary large scale and well-designed studies are still required to evaluate the interaction of CCND1 G870A polymorphism with leukemia and non-Hodgkin lymphoma risk.

The CCND1 G870A Gene Polymorphism and Brain Tumor Risk: a Meta-analysis

Qin, Ling-Yan,Zhao, Li-Gang,Chen, Xu,Li, Ping,Yang, Zheng,Mo, Wu-Ning Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.8

Background: In recent years, numerous studies have been performed to investigate the CCND1 G870A gene polymorphism impact on brain tumors susceptibility. Unfortunately, the results of previous studies were inconsistent. Therefore, we performed a meta-analysis to derive a more precise estimation of any association. Materials and Methods: We conducted a search in PubMed, Embase and CNKI covering all published papers up to November, 2013. Odds ratios (ORs) and their 95% confidence intervals (95%CIs) were applied to assess associations. Results: A total of 6 publications including 9 case-control studies met the inclusion criteria. The pooled ORs for the total included studies showed significant association among comparison A vs G (OR= 1.246, 95%CI= 1.092-1.423, p= 0.001), homozygote comparison AA vs GG (OR= 1.566, 95%CI= 1.194-2.054, p= 0.001), heterozygote comparison AG vs GG (OR= 1.290, 95%CI= 0.934-1.782, p= 0.122), dominant model AA/GA vs GG (OR= 1.381, 95%CI= 1.048-1.821, p= 0.022) and recessive model AA vs GA/GG (OR= 1.323, 95%CI= 1.057-1.657, p= 0.015) especially in glioma. Conclusions: CCND1 G870A polymorphism may increase brain tumor risk, especially for gliomas. However, more primary large scale and well-designed studies are still required to evaluate the interaction of CCND1 G870A polymorphism with brain tumor risk.

The Resistance of Chinese Chestnut Populations to Cryponectria parasitica

Ling Qin,Xia-hong Gao,Kai-yuan Wan,Ji-hong Cheng,De-bing Liu 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Abnormal Brain Activity Changes in Patients with Migraine: A Short-Term Longitudinal Study

Ling Zha,Jixin Liu,Xuemei Yan,Wanghuan Dun,Jing Yang,Liyu Huang,Yuan Kai,Dahua Yu,Wei Qin,Tian Jie,Fanrong Liang 대한신경과학회 2014 Journal of Clinical Neurology Vol.10 No.3

Background and Purpose Whether or not migraine can cause cumulative brain alterationsdue to frequent migraine-related nociceptive input in patients is largely unclear. The aim of thisstudy was to characterize longitudinal changes in brain activity between repeated observationswithin a short time interval in a group of female migraine patients, using resting-state functional magnetic resonance imaging. Methods Nineteen patients and 20 healthy controls (HC) participated in the study. Regionalhomogeneity (ReHo) and functional interregional connectivity were assessed to determine thefocal and global features of brain dysfunction in migraine. The relationship between changes inheadache parameters and longitudinal brain alterations were also investigated. Results All patients reported that their headache activity increased over time. AbnormalReHo changes in the patient group relative to the HC were found in the putamen, orbitofrontalcortex, secondary somatosensory cortex, brainstem, and thalamus. Moreover, these brain regions exhibited longitudinal ReHo changes at the 6-week follow-up examination. These headache activity changes were accompanied by disproportionately dysfunctional connectivity inthe putamen in the migraine patients, as revealed by functional connectivity analysis, suggesting that the putamen plays an important role in integrating diverse information among othermigraine-related brain regions. Conclusions The results obtained in this study suggest that progressive brain aberrations in migraine progress as a result of increased headache attacks.

Thermogravimetric analysis and pyrolysis of waste mixtures of paint and tar slag

Ling Tao,Guang-Bo Zhao,Juan Qian,Yu-Kun Qin 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3

We describe thermogravimetric analyses and pyrolysis kinetic studies carried out on hazardous waste mixtures of tar slag, paint slag, paper, sodium sulfate and calcium oxide. Both thermogravimetric (TG) and differential thermogravimetric (DTG) profiles were measured by a thermogravimetric analyzer at different final temperatures, particle sizes and heating rates. Pyrolysis kinetic parameters were calculated by the Coats-Redfern method. Influences of particle size, heating rate and final temperature on pyrolysis yields and kinetic parameters are also discussed. The results show that final temperature and particle size have a great effect on pyrolysis yields. We find that with increasing temperature the activation energy initially increases to a maximum value and then decreases.

ZSCC suppression method for parallel three‑level inverters based on model predictive control with virtual location vector

Ling Mao,Yuankai Li,Chao Pan,Jianlin Yang,Qin Hu,Yuncong Zheng,Jinbin Zhao 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.4

Parallel three-level neutral point clamped (3L-NPC) inverters are widely used in power conversion applications, such as new energy generation and high voltage inverters. However, the zero-sequence circulating current (ZSCC) between two inverters degrades the whole performance of the system. To suppress the ZSCC in parallel inverters and improve the quality of output current, this study proposes an MPC strategy based on the virtual location vector. First, to reduce the computational burden of MPC, the virtual location vector is constructed by the output current of two inverters so that the control of the parallel inverters is similar to that of a single inverter. Then, the virtual location vector is obtained by using the direct power control method. Finally, the sets of candidate voltage vectors for MPC are determined on the basis of this reference voltage vector and the magnitude of ZSCC. Moreover, the optimal vectors calculated by MPC are assigned to the two inverters. Compared with the traditional MPC strategy, the MPC strategy proposed in this study has better steady state and transient performance with less computational burden. The proposed method is validated in simulation and experimental platforms.

Structural, photoluminescent, and dielectric properties of Eu3+-doped Ba0.7Sr0.3TiO3 thin films

Ling Liu,Ni Qin,Dinghua Bao 한국물리학회 2015 Current Applied Physics Vol.15 No.6

Eu3+-doped Ba0.7Sr0.3TiO3 thin films were prepared by a chemical solution deposition method and characterized by X-ray diffraction, field emission scanning electron microscopy, photoluminescence and dielectric measurements. The thin films were well crystallized with a pure perovskite structure. A contraction of the unit cell was observed upon incorporation of Eu3+ ions below 2 mol%, while an expansion occurred as the Eu3+ concentration was further increased above 2 mol%, indicating that Eu3+ ions with different concentrations occupied different lattice sites. Photoluminescence spectra showed two prominent transitions of Eu3+ ions at 594 nm (5D0→7F1) and 618 nm (5D0→7F2) upon excitation at 395 nm (7F0→5L6). There existed two quenching concentrations at 2 mol% and 4 mol% due to different lattice sites of the Eu3+ ions. We also investigated the dielectric properties of the thin films. Our study suggests that Eu3+-doped Ba0.7Sr0.3TiO3 thin films have potential applications in multifunctional optoelectronic devices.

A Novel Cold-adapted Endoglucanase (M6A) from Microbacterium kitamiense S12 Isolated from Qinghai-Tibetan Plateau

Ling Lin,Na Qin,Linyan Guan 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.3

The gene M6A coding a novel cold-adapt endoglucanase was cloned from Microbacterium kitamiense Sa12 isolated from a wasteland in Saga, Qinghai-Tibetan Plateau. The deduced protein sequence encoded a 411residue polypeptide sharing similar identities with glycosyl hydrolase family 6 enzymes. The recombinant M6A displayed maximum hydrolysis activity of 1.51 U/mg toward soluble cellulose substrate, CMC at 35°C and pH 5.0, and the Km and Vmax value were 2.12 mg/mL and 15.33 μmol/min*mg, respectively. Interestingly, M6A exhibited significant activity even at ice cold condition, showing 30-40% relative activity at 0-5°C, and had good tolerance to Li+, K+, NH4+, Rb+, Ca2+, Mg2+, Zn2+, Mn2+, and Ni2+, expect divalent cation Cu2+ led to 30% residual activity. These properties might make M6A to be a promising candidate used in the psychrophilic industrial process and/ or the volatile and thermosensitive manufacturing process.