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Poly(amide-6-b-ethylene oxide)/[Bmim][Tf2N] blend membranes for carbon dioxide separation

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Journal of Energy Chemistry 2016年第1期25卷 122-130页

作者： Yongtao Qiu Jizhong Ren Dan zhao Hui li Maicun Deng National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China University of Chinese Academy of Sciences Beijing 100049 China

Poly（amide-6-b-ethylene oxide）（Pebax1657）/1-butyl-3-methylimidazo-lium bis[trifluoromethyl）sulfonyl]-imide（[Bmim][Tf2N]） blend membranes with different [Bmim][Tf2N] contents were prepared via solution casting and solvent evaporation method. The permeation properties of the blend membranes for CO2, N2,CH4 and H2 were studied, and the physical properties were characterized by differential scanning calorimeter（DSC） and X-ray diffraction（XRD）. Results showed that [Bmim][Tf2N] was dispersed as amorphous phase in the blend membranes, which caused the decrease of Tg（PE） and crystallinity（PA）. With the addition of [Bmim][Tf2N], the CO2 permeability increased and reached up to approximately 286 Barrer at 40 wt%[Bmim][Tf2N], which was nearly double that of pristine Pebax1657 membrane. The increase of CO2 permeability may be attributed to high intrinsic permeability of [Bmim][Tf2N], the increase of fractional free of volume（FFV） and plasticization effect. However, the CO2 permeability reduced firstly when the [Bmim][Tf2N]content was below 10 wt%, which may be due to that the small ions of [Bmim][Tf2N] in the gap of polymer chain inhibited the flexibility of polymer chain; the interaction between Pebax1657 and [Bmim][Tf2N]decreased the content of EO units available for CO2 transport and led to a more compact structure. For Pebax1657/[Bmim][Tf2N] blend membranes, the permeabilities of N2, H2 and CH4decreased with the increase of feed pressure due to the hydrostatic pressure effect, while CO2 permeability increased with the increase of feed pressure for that the CO2-induced plasticization effect was stronger than hydrostatic pressure effect.

关键词： Poly(amide-6-b-ethylene oxide) Ionic liquid Carbon dioxide separation Blend membrane

Temporal and spatial evolution of a deep-reaching anticyclonic eddy in the South China Sea

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Science China Earth Sciences 2019年第6期62卷 1002-1023页

作者： Meng WANG Yanwei ZHANG Zhifei liU Yulong zhao Jianru li State Key Laboratory of Marine Geology Tongji University

The temporal and spatial evolution of a deep-reaching anticyclonic eddy(AE) is studied using a combination of satellite measurements, moored observations and ocean model reanalysis data in the South China Sea(SCS). Three evolutionary stages in eddy's lifecycle are identified from changes in eddy dynamical characteristics estimated from satellite altimetry: birth(22 days), growth(64 days), and decay(47 days). Similar patterns are also distinguished from dynamic signals in ***, flows reversal and upwelling of cold water below 1500 m were captured by the in-situ records when this energetic,highly nonlinear and long-lived(over 19 weeks) AE passed by our mooring position. Its detailed vertical structure is examined through temperature anomalies, vertical shear of horizontal velocities, and horizontal streamlines estimated from ocean model reanalysis data. Results from the model reveal a mesoscale AE with first-mode baroclinic structure: a bowl-shaped anticyclonic flow in the upper ocean connected to a slant-cylinder cyclonic flow at depth, with a transition layer at depths between 400 and 700 m. It is in good agreement with moored observations but showing a shallower transition depth, suggesting a slight deficiency in the model due to limited deep-sea observations. Last, we estimate eddy heat transport at different depths and stages along the AE's path based on the model data. The result reveals that pronounced heat fluxes occur during growth stage(depths 700–1500 m).Dynamical characteristics suggest that the vertical structure and temporal evolution of the eddy play significant roles in basinscale movement and heat transferring. Considering that mesoscale eddies are ubiquitous in the SCS, our results support a recently-proposed mechanism, whereby upper ocean flows produce changes in the deep-sea circulation, potentially influencing boundary l

关键词： Deep-reaching mesoscale eddy Evolution HYCOM The South China Sea

Autosomal dominant osteopetrosis typeⅡresulting from a de novo mutation in the CLCN7 gene:A case report

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World Journal of Clinical Cases 2022年第20期10卷 6936-6943页

作者： Xiu-li Song li-yuan Peng Dao-Wen Wang Hong Wang Genetic Diagnostic Centre Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030Hubei ProvinceChina Division of Cardiology Department of Internal MedicineTongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030Hubei ProvinceChina

BACKGROUND Osteopetrosis is a family of extremely rare diseases caused by failure of osteoclasts and impaired bone resorption. Among them, autosomal dominant osteopetrosis type Ⅱ(ADO Ⅱ), related to the chloride channel 7(CLCN7) gene, is the most frequent form of osteopetrosis. In this study, we report a de novo mutation of CLCN7 in a patient without the family history of ADO Ⅱ.CASE SUMMARY A 5-year-old Chinese boy with ADO Ⅱ was found to have a de novo mutation in the CLCN7 gene [c.746 C>T(p.P249 L)]. Typical clinical manifestations, including thickening of the cortex of spinal bones and long bones, non-traumatic fracture of the femoral neck, and femoral head necrosis, were found in this patient. The patient is the first reported case of ADO Ⅱ with the missense mutation c.746 C>T(p.P249 L) of the CLCN7 gene reported in China. We also review the available literature on ADO Ⅱ-related CLCN7 mutations, including baseline patient clinical features, special clinical significance, and common *** Our report will enrich the understanding of mutations in ADO Ⅱ patients. The possibility of a de novo mutation should be considered in individuals who have no family history of osteopetrosis.

关键词： Osteopetrosis Chloride channel 7 gene Autosomal dominant osteopetrosis typeⅡ Whole exome sequencing Case report

Thoracic para-aortic lymph node recurrence in patients with esophageal squamous cell carcinoma:A propensity score-matching analysis

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World Journal of Clinical Cases 2022年第36期10卷 13313-13320页

作者： Xu-yuan li li-Sheng Huang Shu-Han Yu Dan Xie Department of Medical Oncology Shantou Central HospitalShantou 515041Guangdong ProvinceChina Department of Radiation Oncology Cancer Hospital of Shantou University Medical CollegeShantou 515041Guangdong ProvinceChina Department of Radiology Shantou Central HospitalShantou 515041Guangdong ProvinceChina

BACKGROUND Thoracic para-aortic lymph node(TPLN)recurrence in esophageal squamous cell carcinoma(ESCC)is rare and its impact on survival is *** studied survival in patients with ESCC who developed TPLN *** To study the survival in patients with ESCC who developed TPLNs *** Data were collected retrospectively for 219 patients who had undergone curative surgery for ESCC during January 2012 to November 2017 and who developed recurrences(36.29%of 604 patients who had undergone curative surgeries for ESCC).The patients were classified into positive(+)and negative(-)TPLN metastasis *** also investigated TPLN recurrence in 223 patients with ESCC following definitive chemoradiotherapy during *** propensity score matching(PSM)and survival estimation,factors predictive of overall survival(OS)were explored using a Cox proportional hazards *** Among the patients with confirmed recurrence,18 were TPLN(+)and 13 developed synchronous distant *** PSM,TPLN(+)was associated with worse recurrence-free(P=0.00049)and OS[vs TPLN(-);P=0.0027],whereas only the intergroup difference in recurrence-free survival remained significant after PSM(P=0.013).The Cox analysis yielded similar *** the patients who had received definitive chemoradiotherapy,3(1.35%)had preoperative TPLN enlargement and none had developed *** TPLN metastasis is rare but may be associated with poor survival.

关键词： Esophageal cancer Surgery Thoracic para-aortic lymph node Overall survival Metastasis

High-Performance Flexible Asymmetric Supercapacitor Based on CoAl-LDH and rGO Electrodes

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Nano-Micro Letters 2017年第3期9卷 72-81页

作者： Shuoshuo li Pengpeng Cheng Jiaxian Luo Dan Zhou Weiming Xu Jingwei li Ruchun li Dingsheng yuan School of Chemistry and Materials Science Jinan UniversityGuangzhou 510632People’s Republic of China Guangzhou Key Laboratory of Vacuum CoatingTechnologies and New Energy Materials Jinan UniversityGuangzhou 510632People’s Republic of China

A flexible asymmetric supercapacitor(ASC)based on a Co Al-layered double hydroxide(Co Al-LDH)electrode and a reduced graphene oxide(r GO) electrode was successfully fabricated. The Co Al-LDH electrode as a positive electrode was synthesized by directly growing Co Al-LDH nanosheet arrays on a carbon cloth(CC)through a facile hydrothermal method, and it delivered a specific capacitance of 616.9 F g^(-1)at a current density of1 A g^(-1). The r GO electrode as a negative electrode was synthesized by coating r GO on the CC via a simple dipcoating method and revealed a specific capacitance of110.0 F g^(-1)at a current density of 2 A g^(-1). Ultimately,the advanced ASC offered a broad voltage window(1.7 V)and exhibited a high superficial capacitance of1.77 F cm^(-2)at 2 m A cm^(-2)and a high energy density of0.71 m Wh cm^(-2)at a power density of 17.05 m W cm^(-2),along with an excellent cycle stability(92.9% capacitance retention over 8000 charge–discharge cycles).

关键词： Flexible asymmetric supercapacitor Layer double hydroxides Reduced graphene oxide Cycle stability

Finite Element Method for Transient Electric Field by Using Indirect Laplace Transform with High Accuracy

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 401-411页

作者： Teng Wen Xiang Cui Xuebao li Sijia liu Zhibin zhao State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China China Electric Power Planning&Engineering Institute Beijing 100120China

This paper focuses on the finite element method in the complex frequency domain(CFD-FEM)for the transient electric ***,the initial value and boundary value problem of the transient electric field under the electroquasistatic field in the complex frequency domain is *** addition,the finite element equation and the constrained electric field equation on the boundary are ***,the indirect algorithm of the numerical inverse Laplace transform is *** on it,the calculation procedures of the CFD-FEM are illustrated in ***,the step response,zero-state response under the positive periodic square waveform(PPSW)voltage,and the zero-input response by the CFD-FEM with direct algorithm and indirect algorithm are ***,the reason for the numerical oscillations of the zero-state response under the PPSW voltage is analyzed,and the method to reduce oscillations is *** results show that the numerical accuracy of the indirect algorithm of the CFD-FEM is more than an order of magnitude higher than that of the direct algorithm when calculating the step response of the transient electric *** proposed method can significantly reduce the numerical oscillations of the zero-state response under the PPSW *** proposed method is helpful for the calculation of the transient electric field,especially in the case of frequency-dependent parameters.

关键词： Electroquasistatic field transient electric field finite element method complex frequency domain numerical Laplace transform

Unseen head pose prediction using dense multivariate label distribution

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Frontiers of Information Technology & Electronic Engineering 2016年第6期17卷 516-526页

作者： Gao-li SANG Hu CHEN Ge HUANG Qi-jun zhao State Key Laboratory of Fundamental Science on Synthetic Vision College of Computer ScienceSichuan University College of Mathematics and Information Engineering Jiaxing University

Accurate head poses are useful for many face-related tasks such as face recognition, gaze estimation,and emotion analysis. Most existing methods estimate head poses that are included in the training data(i.e.,previously seen head poses). To predict head poses that are not seen in the training data, some regression-based methods have been proposed. However, they focus on estimating continuous head pose angles, and thus do not systematically evaluate the performance on predicting unseen head poses. In this paper, we use a dense multivariate label distribution(MLD) to represent the pose angle of a face image. By incorporating both seen and unseen pose angles into MLD, the head pose predictor can estimate unseen head poses with an accuracy comparable to that of estimating seen head poses. On the Pointing'04 database, the mean absolute errors of results for yaw and pitch are 4.01?and 2.13?, respectively. In addition, experiments on the CAS-PEAL and CMU Multi-PIE databases show that the proposed dense MLD-based head pose estimation method can obtain the state-of-the-art performance when compared to some existing methods.

关键词： Head pose estimation Dense multivariate label distribution Sampling intervals Inconsistent labels

Evaluation of patches for rotator cuff repair:A systematic review and meta-analysis based on animal studies

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Bioactive Materials 2022年第4期7卷 474-491页

作者： Jinwei Yang Yuhao Kang Wanlu zhao Jia Jiang Yanbiao Jiang Bing zhao Mingyue Jiao Bo yuan Jinzhong zhao Bin Ma Evidence-Based Medicine Center School of Basic Medical SciencesLanzhou UniversityLanzhou730000China Reproductive Medicine Center Gansu Provincial Maternity and Child-Care HospitalLanzhou730050China Department of Sports Medicine Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai200233China College of Biomedical Engineering Sichuan UniversityChengdu610064China National Engineering Research Center for Biomaterials Chengdu610064China Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province Lanzhou730000China

Based on the published animal studies,we systematically evaluated the outcomes of various materials for rotator cuff repair in animal models and the potentials of their clinical translation.74 animal studies were finally included,of which naturally derived biomaterials were applied the most widely(50.0%),rats were the most commonly used animal model(47.0%),and autologous tissue demonstrated the best outcomes in all animal *** biomechanical properties of naturally derived biomaterials(maximum failure load:WMD 18.68[95%CI 7.71-29.66];P=0.001,and stiffness:WMD 1.30[95%CI 0.01-2.60];P=0.048)was statistically significant in the rabbit *** rabbit model showed better outcomes even though the injury was severer compared with the rat model.

关键词： Rotator cuff patch Animal model Systematic review Meta-analysis Safety and effectiveness

Local melting mechanism and its effects on mechanical properties of friction spot welded joint for Al-Zn-Mg-Cu alloy

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Journal of Materials Science & Technology 2018年第1期34卷 185-191页

作者： Yunqiang zhao Chungui Wang Jizhong li Jinhong Tan Chunlin Dong Guangdong Welding Institute (China-Ukraine E.O.Paton Institute of Welding) Guangzhou 510651 China

Local melting and the eutectic film and liquation crack formation mechanisms during friction spot weld- ing （FSpW） of Al-Zn-Mg-Cu alloy were studied by both experiment and finite element simulation. Their effects on mechanical properties of the joint were examined. When the welding heat input was high, the peak temperature in the stir zone was higher than the incipient melting temperature of the Al-Zn-Mg-Cu alloy. This resulted in local melting along the grain boundaries in this zone. In the retreating stage of the welding process, the formed liquid phase was driven by the flowing plastic material and redistributed as a ＂U-shaped＂ line in the stir zone. In the following cooling stage, this liquid phase transformed into eutectic films and liquation cracks. As a result, a new characteristic of＂U＂ line that consisted of eutectic films and liquation cracks is formed in the FSpWjoin. This ＂U＂ line was located in the high stress region when the FSpW joint was loaded, thus it was adverse to the mechanical properties of the FSpW joint. During tensile shear tests, the ＂U＂ line became a preferred crack propagation path, resulting in the occurrence of brittle fracture.

关键词： Friction spot welding Numerical simulation Local melting liquation crack Mechanical property