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SiO_2@C hollow sphere anodes for lithium-ion batteries

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Journal of Materials Science & Technology 2017年第3期33卷 239-245页

作者： xuelian liu Yuxi Chen Hongbo liu Zhi-Quan liu College of Materials Science and Engineering/Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

As anode materials for lithium-ion batteries, SiO2 is of great interest because of its high capacity, low cost and environmental affinity. A facile approach has been developed to fabricate SiO2@C hollow spheres by hydrolysis of tetraethyl orthosilicate（TEOS） to form SiO2 shells on organic sphere templates followed by calcinations in air to remove the templates, and then the SiO2 shells are covered by carbon *** microscopy investigations confirm hollow structure of the SiO2@C. The SiO2@C hollow spheres with different SiO2 contents display gradual increase in specific capacity with discharge/charge cycling,among which the SiO2@C with SiO2 content of 67 wt% exhibits discharge/charge capacities of 653.4/649.6 mAh g^（-1） over 160 cycles at current density of 0.11 mA cm^（-2）. The impedance fitting of the electrochemical impedance spectroscopy shows that the SiO2@C with SiO2 content of 67 wt% has the lowest charge transfer resistance, which indicates that the SiO2@C hollow spheres is promising anode candidate for lithium-ion batteries.

关键词： Silica Hollow spheres Carbon coating Anode Lithium-ion batteries

External Pressure Forming and Buckling Analysis of Tubular Parts with Ribs

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Journal of Materials Science & Technology 2006年第5期22卷 708-712页

作者： Gang liu xuelian YIN Shijian YUAN School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

Buckling and forming processes of tubes with varying slenderness ratio （ratio of length to diameter） under external hydraulic pressure were analyzed with three-dimensional finite element method （FEM） for studying tube external pressure forming （EPF）. Buckling pressures for different tube blanks without mandrel were predicted, and an EPF of a carbon steel tube onto a mandrel with six ribs was simulated. Both thickness distribution and buckling pressure from the simulations were found to be in agreement with those from experiments. Buckling pressures are shown to be a function of the slenderness ratio. The tubular part with six ribs produced by EPF has a uniform thickness distribution, whose maximum thinning rate is only 5.9%.

关键词： External pressure forming Hydroforming Lightweight component Buckling

Earthworm regulation of nitrogen pools and dynamics and marker genes of nitrogen cycling: A meta-analysis

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Pedosphere 2022年第1期32卷 131-139页

作者： Rui XUE Chong WANG xuelian liu Mengli liu College of Resources Environmental SciencesChina Agricultural UniversityBeijing 100193China Beijing Key Laboratory of Biodiversity and Organic Farming Beijing 100193China State Key Laboratory of Direct-Fed Microbial Engineering Beijing Dabeinong Science and Technology Group Co.Ltd.(DBN)Beijing 100192China

Earthworms, as the ecosystem engineers, both directly and indirectly affect the nitrogen(N) cycle. We aimed to provide a quantitative assessment of the contribution of earthworms to the terrestrial ecosystem N cycle using meta-analysis of 130 publications selected. The natural logarithm of the response ratio(lnRR) was used to indicate the effect size of earthworms on N dynamic variables. The results showed that earthworms significantly affected soil N-cycling microorganisms, including the amoA gene abundance of soil ammonia-oxidizing bacteria(AOB), and significantly promoted soil N cycle processes,including denitrification, mineralization, and plant assimilation. The effects of earthworms on the N cycle were experimental design dependent and affected by factors such as the functional group of earthworm and residue input. The presence of the anecic earthworms decreased the rates of mineralization and nitrification, and increased nitrification and denitrification responses were more pronounced in the presence of the endogeic earthworms than that of the other two functional groups of earthworms. In addition, residue input enhanced the effects of earthworms on the N cycle. The effects of earthworms on nitrous oxide(N_(2) O) emission increased when residues were added. These findings indicate that residue input and introducing suitable functional groups of earthworms into the field can lead to N sustainability without increasing N2 O emission. This meta-analysis also provides systematic evidence for the positive effects of earthworms on the plant N pool, N availability(soil ammonium(NH_(4)^(+)) content), and soil microbial biomass N content, showing the potential to alter ecosystem functions and services in relation to N cycling.

关键词： ammonia-oxidizing bacteria denitrification earthworm functional group mineralization nitrification residue input

Link Maintenance Scheme for OFDM-Based Cognitive Radio Ad Hoc Networks

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China Communications 2015年第10期12卷 42-51页

作者： LI Jingye LUO Tao liu xuelian YUE Guangxin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Transmission among the cognitive users(CUs)' is always interrupted by the primary users(PUs)' reclaim of the spectrum and the fading effect of wireless *** maintain reliable continuous communication among CUs,an efficient scheme for link maintenance in OFDM-based cognitive radio Ad Hoc networks is proposed in this *** the scheme,redundant sub-channels(RSC) are employed by CUs to tackle the outage problem caused by the PUs' reclaim of the spectrum and wireless fading effect in the ***,backup sub-channels(BSC) are arranged to help select sub-channels with better channel ***,to lower the overhead and improve the accuracy of the spectrum sensing,a partial sensing module is designed to enable the CUs to inherit and update the original idle spectrum list until it *** results show that the proposed scheme can realize higher throughput and lower sensing overhead with slight reduction of the forced termination probability(FTP) performance compared to the existing approaches.

关键词： cognitive radio link maintenance sensing overhead

A High-Linear Radio Frequency Quadrature Modulator with Improved Sideband Suppression and Carrier Leakage Performance

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Tsinghua Science and Technology 2024年第3期29卷 635-643页

作者： Yingdan Jiang Zongguang Yu Shutong Wu Li Li xuelian liu School of Electronic Science and Engineering Nanjing UniversityNanjing 210093China The 58th Research Institute of China Electronic Technology Group Corporation Wuxi 214072China

The quadrature modulator is a crucial block in transmitters that upconverts baseband signals to theRadio Frequency(RF)band of interest using local oscillator *** this paper,non-ideal factors thatinfluence the performance of the quadrature modulator are considered,and solutions are accordingly taken inthe quadrature modulator design.A high-linear RF quadrature modulator with improved sideband suppressionand carrier leakage performance is presented in this *** quadrature modulator implemented in the0.18-μm SiGe process uses the current bleeding technique to improve the general performance of the doublebalanced active Gilbert *** on-chip prescaler followed by two cascaded limiting amplifiers is designed toprovide accurate quadrature local oscillator *** at quadrature baseband signal input ports areproposed to eliminate DC *** measured sideband suppression achieves a performance of better than−43 dBc and carrier leakage is less than−38 dBm over the output RF frequency range of 30 MHz to 2.15 *** output 1 dB compression point equals 11.4 dBm at 800 MHz.

关键词： Radio Frequency(RF) quadrature modulator sideband suppression carrier leakage linearity

Dendritic BiVO4 decorated with MnOx co-catalyst as an efficient hierarchical catalyst for photocatalytic ozonation

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Frontiers of Chemical Science and Engineering 2019年第1期13卷 185-191页

作者： Jin Yang xuelian liu Hongbin Cao Yanchun Shi Yongbing Xie Jiadong Xiao School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Beijing Engineering Research Center of Process Pollution Control CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

An appropriate co-catalyst can significantly promote the photocatalytic efficacy, but this has been seldom studied in the visible-light photocatalysis combined with ozone, namely photocatalytic ozonation. In this work, a dendritic bismuth vanadium tetraoxide (BiVO4) material composited with highly dispersed MnOv nanoparticles was synthesized, and its catalytic activity is 86.6% higher than bare BiVO4 in a visible light and ozone combined process. Catalytic ozonation experiments, ultraviolet- visible (UV-Vis) diffuse reflectance spectra and photoluminescence spectra jointly indicate that MnOA plays a triple role in this process. MnOv strengthens the light adsorption and promotes the charge separation on the composite material, and it also shows good activity in catalytic ozonation. The key reactive species in this process is OH, and various pathways for its generation in this process is proposed. This work provides a new direction of catalyst preparation and pushes forward the application of photocatalytic ozonation in water treatment.

关键词： manganese oxide bismuth vanadium tetraoxide photocatalytic ozonation hydroxyl radical cocatalyst

Decreased miR-325-5p Contributes to Visceral Hypersensitivity Through Post-transcriptional Upregulation of CCL2 in Rat Dorsal Root Ganglia

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Neuroscience Bulletin 2019年第5期35卷 791-801页

作者： Rui Wu Ping-An Zhang xuelian liu Yuan Zhou Meijie Xu Xinghong Jiang Jun Yan Guang-Yin Xu Center for Translational Medicine Affiliated Zhangjiagang Hospital of Soochow University Zhangjiagang 215600 China Department of Physiology and Neurobiology Institute of Neuroscience Soochow University Suzhou 215123 China The Second Affiliated of Hospital Soochow University Suzhou 215004 China

Chronic visceral hypersensitivity is an important type of chronic pain with unknown etiology and pathophysiology. Recent studies have shown that epigenetic regulation plays an important role in the development of chronic pain conditions. However, the role of mi RNA-325-5 p in chronic visceral pain remains unknown. The present study was designed to determine the roles and mechanism of mi RNA-325-5 p in a rat model of chronic visceral *** model was induced by neonatal colonic inflammation(NCI). In adulthood, NCI led to a significant reduction in the expression of mi RNA-325-5 p in colon-related dorsal root ganglia(DRGs), starting to decrease at the age of4 weeks and being maintained to 8 weeks. Intrathecal administration of mi RNA-325-5 p agomir significantly enhanced the colorectal distention(CRD) threshold in a time-dependent manner. NCI also markedly increased the expression of CCL2(C-C motif chemokine ligand 2) in colon-related DRGs at the m RNA and protein levels relative to age-matched control rats. The expression of CXCL12, IL33, SFRS7, and LGI1 was not significantlyaltered in NCI rats. CCL2 was co-expressed in Neu Npositive DRG neurons but not in glutamine synthetasepositive glial cells. Furthermore, CCL2 was mainly expressed in isolectin B4-binding-and calcitonin generelated peptide-positive DRG neurons but in few NF-200-positive cells. More importantly, CCL2 was expressed in mi R-325-5 p-positive DRG neurons. Intrathecal injection of mi RNA-325-5 p agomir remarkably reduced the upregulation of CCL2 in NCI rats. Administration of Bindarit, an inhibitor of CCL2, markedly raised the CRD threshold in NCI rats in a dose-and time-dependent manner. These data suggest that NCI suppresses mi RNA-325-5 p expression and enhances CCL2 expression, thus contributing to visceral hypersensitivity in adult rats.

关键词： Visceral pain Dorsal root ganglia miRNA-325-5p CCL2 Epigenetic regulation

Implementation and evaluation of a pain management core competency education program for surgical nurses

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International Journal of Nursing Sciences 2021年第1期8卷 51-57,I0004页

作者： xuelian liu Li Li Lingxiao Wang Keela Herr Qiuchan Chen Department of Nursing Zhujiang HospitalSouthern Medical UniversityGuangzhouChina College of Nursing The University of IowaIowa CityIAUnited States

Objective:To investigate the effect of a pain management core competency education program on surgical nurses’pain knowledge and pain management nursing practice ***:An 8-h education program focused on pain management core competency was provided twice in two weeks including the multidimensional nature of pain,pain assessment,pharmacological and nonpharmacological management,and knowledge application was developed and implemented for surgical nurses by a multidisciplinary *** teaching approaches such as didactic teaching and vignettes of cases for nurses to discuss were *** Clinical Pain Knowledge Test(CPKT)was completed by 135 and 107 nurses from 17 surgical wards pre and post-program,*** hundred and three patients’medical records were randomly sampled according to the number of operations in each ward one week before and in the fifth week after the intervention,*** of patients’postoperative pain management nursing practice behaviors and pain intensity scores were ***:After the intervention,the CPKT scores of nurses significantly increased from 45.6%±12.3%to 54.2%±10.2%(t=5.786,P<0.001).Nurses’postoperative pain management nursing practice improved,with proportion of pain assessment documentation increased from 59.6%(121/203)to 74.9%(152/203)(χ^(2)=10.746,P=0.001),those using pain intensity assessment tools increased from 81.8%(99/121)to 95.4%(145/152)(χ^(2)=13.079,P<0.001),and intramuscular injection of nonopioids decreased from 12.6%(13/103)to 2.7%(3/111)(χ^(2)=7.598,P=0.006).Patients’average worst pain score on the operation day significantly decreased(Z=-2.486,P=0.013),and scores from the first to the third postoperative day also decreased(Z=-2.172,P=0.030).Conclusions:Implementation of a pain management core competency education program for surgical nurses can increase their knowledge of core competencies of pain management,improve selected pain management practices,and decrease p

关键词： Education Nurses Pain management Surgery department

Adverse effects of double-hit combining ISS-Ⅲ stage and 1q gain or del(17p) on prognosis of patients with newly diagnosed multiple myeloma

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China Medical Abstracts(Internal Medicine) 2020年第2期37卷 108-109页

作者： liu xuelian Dept Hematol Cancer Center 1st Affil HospJilin UnivChangchun 130021

Objective To evaluate the prognostic significance of combining ISS-Ⅲ and high risk cytogenetic abnormalities[HRCAs,including 1 q gain/amplification and del(17p)] in patients with newly-diagnosed multiple myeloma (NDMM).Methods The clinical characteristics and relevant variables were retrospectively analyzed in a total of 270 NDMM patients diagnosed between November 2009 and May 2018.

关键词： patients myeloma clinical