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Permeability and selectivity synergistically enhanced nanofluidic membrane for osmotic energy harvesting

CARBON ENERGY 2024年第8期6卷 14-24页

作者： Zhong, Jundong Xu, Tingting Qi, Hongyan Sun, Weibo Zhao, Shuang Zhao, Zhe Sun, Yirong Zhu, Youliang mu, jianxin Zhang, Haibo Zhu, Xuanbo Jiang, Zhenhua Jiang, Lei Jilin Univ Natl & Local Joint Engn Lab Synthet Technol High P Changchun Jilin Peoples R China Jilin Univ Key Lab Mol Enzymol & Engn Minist Educ Changchun Jilin Peoples R China Jilin Univ Coll Chem Natl & Local Joint Engn Lab Synthet Technol High P Changchun 130012 Jilin Peoples R China Jilin Univ State Key Lab Supramol Struct & Mat Changchun Jilin Peoples R China Chinese Acad Sci Tech Inst Phys & Chem CAS Key Lab Bioinspired Mat & Interfacial Sci Beijing Peoples R China

For the porous-membrane-based osmotic energy generator, the potential synergistic enhancement mechanism of various key parameters is still controversial, especially because optimizing the trade-off between permeability and selectivity is still a challenge. Here, to construct a permeability and selectivity synergistically enhanced osmotic energy generator, the two-dimensional porous membranes with tunable charge density are prepared by inserting sulfonated polyether sulfone into graphene oxide. Influences of charge density and pore size on the ion transport are explored, and the ionic behaviors in the channel are calculated by numerical simulations. The mechanism of ion transport in the process is studied in depth, and the fundamental principles of energy conversion are revealed. The results demonstrate that charge density and pore size should be matched to construct the optimal ion channel. This collaborative enhancement strategy of permeability and selectivity has significantly improved the output power in osmotic energy generation; compared to the pure graphene oxide membrane, the composite membrane presents almost 20 times improvement. Transmembrane properties of ions are crucial for osmotic energy conversion. In this study, to achieve synergistic enhancement of permeability and selectivity, the mechanism of charge density and pore size in ion transport are studied in-depth. Results of the experiment and theoretical calculation demonstrate that the charge density and pore size should be matched to construct the optimal ion channel. This collaborative enhancement strategy of permeability and selectivity is expected to promote the utilization of clean energy in the future. image

关键词： blue energy generator charge tunable graphene oxide ion transport layered nanocomposites GRAPHENE OXIDE MEMBRANE ION-TRANSPORT NANOPORES

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羌塘高原极大陆型冰川厚度分布模拟与冰储量估算

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地球科学进展 2024年第7期39卷 726-736页

作者：梁鹏斌牟建新高永鹏田立德李林涛青海理工学院生态与环境科学学院青海西宁810000 青海省高原气候变化及其生态环境效应重点实验室青海西宁810000 中国科学院西北生态环境资源研究院冰冻圈科学与冻土工程重点实验室甘肃兰州730000 云南师范大学地理学部云南昆明650500 云南大学国际河流与生态安全研究院云南昆明650500

冰川厚度与储量是未来冰川变化预测、可用淡水资源估计以及潜在海平面上升评估等冰川学研究的前提。基于我国西部31条冰川实测探地雷达厚度数据,对GlabTop2冰厚模型进行参数校正和优化,模拟羌塘高原冰川厚度分布并评估冰川水资源总量,... 详细信息

冰川厚度与储量是未来冰川变化预测、可用淡水资源估计以及潜在海平面上升评估等冰川学研究的前提。基于我国西部31条冰川实测探地雷达厚度数据,对GlabTop2冰厚模型进行参数校正和优化,模拟羌塘高原冰川厚度分布并评估冰川水资源总量,结果表明:(1)GlabTop2模型模拟的冰川平均厚度与实测平均厚度较接近,二者相关性为0.87,均方根误差为18.2 m,模型对冰川厚度的高估和低估分别为9%和-17%,模型模拟冰川中流线基岩地形形状的能力优于剖面基岩形状;(2)2022年羌塘高原冰川储量为(177.6±26.6)km^(3),平均冰川厚度为(88.2±12.3)m,冰储量集中分布在5600~6200 m,为(148.28±22.24)km^(3),占整个羌塘高原冰川总储量的84.4%,其余高程带冰储量分布相对较少。

关键词：羌塘高原冰川储量探地雷达 GlabTop2模型

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Identification of S-genotypes and a novel S-RNase in 84 native Chinese pear accessions

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Horticultural Plant Journal 2022年第6期8卷 713-726页

作者： Min He Lufei Li Ying Xu jianxin mu Zhihua Xie Chao Gu Shaoling Zhang Pear Engineering and Technology Research Center State Key Laboratory of Crop Genetics and Germplasm EnhancementNanjing Agricultural UniversityNanjing 210095China

The Chinese pear(Pyrus spp.)exhibits typical gametophytic self-incompatibility(GSI),which inhibits self-crossing and promotes outcrossing,similar to other fruit species in the Rosaceae ***,S-compatible cultivars are required in pear orchards to ensure successful pollination and stable *** this study,84 native Chinese pear accessions were genotyped by allele-specific PCR using one pair allele consensus primers and 29 pairs of S-allele-specific primers that were designed in this *** cloning and sequencing the PCR products,the S-genotypes of all 84 pear accessions,including wild and cultivated accessions,were *** reported 34 S-alleles and a novel S-allele were isolated from these pear *** S-alleles were expressed specifically in the *** analysis identified that six pear cultivars originated in China shared the same S-RNases with ***(Pc).These findings supported the hypothesis that oriental and occidental Pyrus *** share the same pool of alleles at the S-locus.A novel S-RNase was isolated in ‘Putiandouli’,‘Daguoshanli’,‘Yunhongli1,and‘Dianli’and deposited as S67-RNase under accession number ***,the deduced amino acid sequences exhibited high similarity(99.56%)to S32-RNase in *** high similarity between S-RNase in Pyrus and Malus indicated that the existence of S-RNase could have predated speciation between Pyrus and ***,S-allele information was rearranged in Asian and European pears to provide information for selecting the best pollinator for widely cultivated pear cultivars in *** information is useful for pear production,cross-breeding,and understanding the mechanism of the self-incompatibility reaction.

关键词： Pear S-RNase S-genotype Parent assignment

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High-precision measurements of the inter-annual evolution for Urumqi Glacier No.1 in eastern Tien Shan,China

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Research in Cold and Arid Regions 2021年第6期13卷 474-487页

作者： ChunHai Xu ZhongQin Li jianxin mu PuYu Wang FeiTeng Wang State Key Laboratory of Cryospheric Science/Tien Shan Glaciological Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China National Cryosphere Desert Data Center Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China

High-precision measuring of glacier evolution remains a challenge as the available global and regional remote sensing techniques cannot satisfactorily capture the local-scale processes of most small-and medium-sized mountain *** this study,we use a high-precision local remote sensing technique,long-range terrestrial laser scanning(TLS),to measure the evolution of Urumqi Glacier No.1 at an annual *** found that the dense point clouds derived from the TLS survey can be used to reconstruct glacier surface terrain,with certain details,such as depressions,debris-covered areas,and supra-glacial drainages can be *** glacier experienced pronounced thickness thinning and continuous retreat over the last four mass-balance years(2015−2019).The mean surface slope of Urumqi Glacier No.1 gradually steepened,which may increase the removal of glacier *** glacier was deeply incised by two very prominent primary supra-glacial rivers,and those rivers presented a widening *** networks of supra-glacial channels had a significant impact on accelerated glacier mass ***-precision measuring is of vital importance to understanding the annual evolution of this type of glacier.

关键词： glacier thickness change front variation supra-glacial drainage pathway long-range terrestrial laser scanning(TLS) climate change

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萨吾尔山冰川现状及演化过程

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干旱区地理 2024年第8期47卷 1277-1291页

作者：牟建新李忠勤王璞玉梁鹏斌王炎强白昌彬王芳龙中国科学院西北生态环境资源研究院冰冻圈科学与冻土工程重点实验室/阿尔泰山冰冻圈科学与可持续发展综合观测研究站甘肃兰州730000 青海理工学院生态与环境科学学院青海西宁810000 青海省高原气候变化及其生态环境效应重点实验室青海西宁810000 山西农业大学资源环境学院山西太谷030801 南宁师范大学广西南宁530001

萨吾尔山是中国西部14座冰川分布的山系之一,横跨中国和哈萨克斯坦两国,尽管冰川规模不大,但因二元政治主体割裂了科学研究的完整性,同时萨吾尔山冰川水资源对于新疆阿勒泰地区吉木乃县可持续发展具有重要意义,为此结合航摄地形图、Land... 详细信息

萨吾尔山是中国西部14座冰川分布的山系之一,横跨中国和哈萨克斯坦两国,尽管冰川规模不大,但因二元政治主体割裂了科学研究的完整性,同时萨吾尔山冰川水资源对于新疆阿勒泰地区吉木乃县可持续发展具有重要意义,为此结合航摄地形图、Landsat及Sentinel卫星遥感影像,并参考已有冰川编目和Google Earth高分辨率历史图像等数据资料,在野外台站现场观测验证基础上对萨吾尔山冰川当前现状和过去30多年间的变化进行了详细研究。结果表明:(1)截止2022年,萨吾尔山共分布冰川31条,总面积11.47 km^(2),新疆吉木乃县境内的木斯岛冰川为最大规模冰川,面积2.95 km^(2),其余90%的冰川其面积不足1 km^(2)。(2)过去30多年来,萨吾尔山冰川变化的总体趋势是冰川分裂、面积减小和末端后退持续增加。冰川数量从12条分裂成31条,1989-2022年冰川面积减少8.11 km^(2),退缩率达41.42%,冰川末端退缩11.30 m。气温升高、冰川反照率降低和冰川破碎程度加大是引起萨吾尔山冰川退缩的主要原因。(3)相较于我国其他13座高大山系,萨吾尔山在过去半个多世纪中冰川面积相对退缩幅度最大。未来在全球气候变暖背景下萨吾尔山冰川极大可能会基本消融殆尽,这对本就干旱贫水的吉木乃县可持续发展将产生重要影响,需提早统筹谋划以应对未来的水资源危机。

关键词：冰川现状演化过程冰川变化萨吾尔山

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Effect of topography on the changes of Urumqi Glacier No.1 in the Chinese Tianshan Mountains

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Journal of Arid Land 2022年第7期14卷 719-738页

作者： LI Hongliang WANG Puyu LI Zhongqin JIN Shuang XU Chunhai mu jianxin HE Jie YU Fengchen State Key Laboratory of Cryosphere Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China College of Sciences Shihezi UniversityShihezi 832000China College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China

Topography plays an important role in determining the glacier ***,topography has often been oversimplified in the studies of the glacier *** systematic studies have been conducted to evaluate the relationship between the glacier changes and topographic *** present study provided a detailed insight into the changes in the two branches(east branch and west branch)of Urumqi Glacier No.1 in the Chinese Tianshan Mountains since 1993 and systematically discussed the effect of topography on the glacier *** study analyzed comprehensive recently observed data(from 1992/1993 to 2018/2019),including mass balance,ice thickness,surface elevation,ice velocity,terminus,and area,and then determined the differences in the changes of the two branches and explored the effect of topography on the glacier *** also applied a topographic solar radiation model to analyze the influence of topography on the incoming shortwave radiation(SW_(in))across the entire glacier,focusing on the difference in the SW_(in) between the two *** glacier mass balance of the east branch was more negative than that of the west branch from 1992/1993 to 2018/2019,and this was mainly attributed to the lower average altitude of the east *** with the west branch,the decrease rate of the ice velocity was lower in the east branch owing to its relatively increased *** narrow shape of the west branch and its southeast aspect in the earlier period resulted in a larger glacier terminus retreat of the west *** spatial variability of the SW_(in) across the glacier surface became much larger as altitude *** SW_(in) received by the east branch was slightly larger than that received by the west branch,and the northern aspect could receive more SW_(in),leading to glacier *** the future,the difference of the glacier changes between the two branches will continue to exist due to their topographic *** work is fundamental

关键词： glacier changes topography solar radiation glacier terminus retreat climate warming Urumqi Glacier No.1 Chinese Tianshan Mountains

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Leaching kinetics of fluorine during the aluminum removal from spent Li-ion battery cathode materials

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Journal of Environmental Sciences 2024年第4期138卷 312-325页

作者： Shengjie Li jianxin Zhu Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

The high content of aluminum(Al)impurity in the recycled cathode powder seriously affects the extraction efficiency of Nickel,Cobalt,Manganese,and Lithium resources and the actual commercial value of recycled materials,so Al removal is crucially important to conform to the industrial standard of spent Li-ion battery cathode *** this work,we systematically investigated the leaching process and optimum conditions associated with Al removal from the cathode powder materials collected in a wet cathode-powder peeling and recycling production line of spent Li-ion batteries(LIBs).Moreover,we specifically studied the leaching of fluorine(F)synergistically happened along with the removal process of Al,which was not concerned about in other studies,but one of the key factors affecting pollution prevention in the recovery *** mechanism of the whole process including the leaching of Al and F from the cathode powder was indicated by using NMR,FTIR,and XPS,and a defluoridation process was preliminarily investigated in this *** leaching kinetics of Al could be successfully described by the shrinking core model,controlled by the diffusion process and the activation energy was 11.14 kJ/***,the leaching of F was attributed to the dissolution of LiPF6and decomposition of PVDF,and the kinetics associated was described by Avrami *** interaction of Al and F is advantageous to realize the defluoridation to some *** is expected that our investigation will provide theoretical support for the large-scale recycling of spent LIBs.

关键词： Al removal F leaching Cathode powder Heating alkali leaching Leaching kinetics

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Challenges and opportunities in rare cancer research in China

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Science China(Life Sciences) 2024年第2期67卷 274-285页

作者： jianxin Xue Qunyan Lyu Division of Thoracic Tumor multimodality Treatment Cancer CenterWest China HospitalSichuan UniversityChengdu 610041China National Natural Science Foundation of China Beijing 100085China

Cancer is one of the major public health challenges in *** cancers collectively account for a considerable proportion of all *** lack of awareness of rare cancers among healthcare professionals and the general public,the typically complex and delayed diagnosis,and limited access to clinical trials are key *** years have witnessed an increase in funding for research related to rare cancers in *** this review,we provide a comprehensive overview of rare cancers and summarize the status of research on rare cancers in China and overseas,including the trends of funding and *** also highlight the challenges and perspectives regarding rare cancers in China.

关键词： rare cancers basic research clinical research preclinical model funding scheme

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ContextAug:model-domain failing test augmentation with contextual information

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Frontiers of Computer Science 2024年第2期18卷 43-60页

作者： Zhuo ZHANG jianxin XUE Deheng YANG Xiaoguang MAO School of Information Technology and Engineering Guangzhou College of CommerceGuangzhou 511363China School of Computer and Information Engineering Institute for Artificial IntelligenceShanghai Polytechnic UniversityShanghai 201209China College of Computer National University of Defense TechnologyChangsha 410073China

In the process of software development,the ability to localize faults is crucial for improving the efficiency of *** speaking,detecting and repairing errant behavior at an early stage of the development cycle considerably reduces costs and development *** have tried to utilize various methods to locate the faulty ***,failing test cases usually account for a small portion of the test suite,which inevitably leads to the class-imbalance phenomenon and hampers the effectiveness of fault ***,in this work,we propose a new fault localization approach named *** obtaining dynamic execution through test cases,ContextAug traces these executions to build an information model;subsequently,it constructs a failure context with propagation dependencies to intersect with new model-domain failing test samples synthesized by the minimum variability of the minority feature *** contrast to traditional test generation directly from the input domain,ContextAug seeks a new perspective to synthesize failing test samples from the model domain,which is much easier to augment test *** conducting empirical research on real large-sized programs with 13 state-of-the-art fault localization approaches,ContextAug could significantly improve fault localization effectiveness with up to 54.53%.Thus,ContextAug is verified as able to improve fault localization effectiveness.

关键词： context fault localization test cases

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Coarse-fine joint target parameter estimation method based on AN-RSC in OFDM passive radar

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Journal of Systems Engineering and Electronics 2024年第2期35卷 339-349页

作者： WANG Chujun WAN Xianrong YI jianxin CHENG Feng School of Electronic Information Wuhan UniversityWuhan 430072China

In this paper,we study the accuracy of delay-Doppler parameter estimation of targets in a passive radar using orthogonal frequency division multiplexing(OFDM)signal.A coarse-fine joint estimation method is proposed to achieve better estimation accuracy of target parameters without excessive computational ***,the modulation symbol domain(MSD)method is used to roughly estimate the delay and Doppler of ***,to obtain high-precision Doppler estimation,the atomic norm(AN)based on the multiple measurement vectors(MMV)model(MMV-AN)is used to manifest the signal sparsity in the continuous Doppler *** the same time,a reference signal compensation(RSC)method is presented to obtain highprecision delay *** results based on the OFDM signal show that the coarse-fine joint estimation method based on AN-RSC can obtain a more accurate estimation of target parameters compared with other *** addition,the proposed method also possesses computational advantages compared with the joint parameter estimation.

关键词： passive radar orthogonal frequency division multiplexing(OFDM)signal atomic norm(AN) parameter estimation

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