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Roles of soluble minerals in Cd sorption onto rice straw biochar

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Journal of Environmental Sciences 2022年第3期34卷 64-71页

作者： Ying-heng fei Zuannan Zhang Zhuofeng ye Qihang Wu ye-tao Tang Tangfu Xiao School of Environment Science and Engineering Guangzhou UniversityGuangzhou 510006China School of Environment Science and Engineering Sun Yat-sen UniversityGuangzhou 510006China

Transforming to biochar provides an environmentally friendly approach for crop residue reutilization,which are usually applied as sorbent for heavy metal *** typical siliconrich material,the specific sorptive mechanisms of rice straw derived biochar(RSBC)are concerned,especially at the low concentration range which is more environmentally *** the present study,Cd sorption onto RSBCs at the concentration of ≤5 mg/L was *** sorptive capacity was positively correlated with the pyrolytic temperature of the biochar and the environmental pH *** soluble minerals of the RSBCs played the dominant roles in Cd sorption,contributing 29.2%,62.5%and 82.9%of the total sorption for RSBCs derived under 300℃,500℃and 700℃,*** number of cations,dominantly K^(+),were exchanged during the *** with cations and carbonates may also be contributive to the *** dissolution of silicon-containing minerals was found to be declined during sorption,suggesting its involvement in the sorption process,possibly through ***,the sparingly soluble silicate crystals may impose ignorable role in the *** with organic groups is only a minor mechanism in Cd sorption,compared to the much more dominant roles of the inorganic ashes.

关键词： Cadmium Sorption Rice straw Biochar Silicon-rich

Atomic origin of the traps in memristive interface

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Nano Research 2017年第6期10卷 1924-1931页

作者： ye Tian Lida Pan Chuan fei Guo Qian Liu CAS Center of Excellence for Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology No. 11 Beiyitiao Zhongguancun Beijing 100190 China School of Communication and Electronics Engineering Hunan City University Yiyang 413000 China Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 USA Institute of Physics Chinese Academy of Sciences Beijing 100190 China Photonics Research Group Department of Information Technology Ghent University-IMEC Ghent B-9000 Belgium Department of Materials Science and Engineering South University of Science and Technology of China Shenzhen 518055 China

In recent years, trap-related interfacial transport phenomena have received great attention owing to their potential applications in resistive switching devices and photo detectors. Not long ago, one new type of memristive interface that is composed of F-doped SnO2 and Bi2S3 nano-network layers has demonstrated a bivariate-continuous-tunable resistance with a swift response comparable to the one in neuron synapses and with a brain-like memorizing capability. However, the resistive mechanism is still not clearly understood because of lack of evidence, and the limited improvement in the development of the interfacial device. By combining I-V characterization, electron energy-loss spectroscopy, and first- principle calculation, we studied in detail the macro/micro features of the memristive interface using experimental and theoretical methods, and confirmed that its atomic origin is attributed to the traps induced by O-doping. This implies that impurity-doping might be an effective strategy for improving switching features and building new interfacial memristors.

关键词： memristance interface trap state first principle calculation

Structural and functional alterations in the brains of patients with anisometropic and strabismic amblyopia:a systematic review of magnetic resonance imaging studies

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Neural Regeneration Research 2023年第11期18卷 2348-2356页

作者： Yuxia Wang ye Wu Lekai Luo fei Li Huaxi MR Research Center(HMRRC) Department of RadiologyWest China Hospital of Sichuan UniversityChengduSichuan ProvinceChina Department of Ophthalmology Laboratory of Optometry and Vision SciencesWest China Hospital/West China School of MedicineSichuan UniversityChengduSichuan ProvinceChina Department of Radiology West China Second Hospital of Sichuan UniversityChengduSichuan ProvinceChina

Amblyopia is the most common cause of vision loss in children and can persist into adulthood in the absence of effective *** clinical and neuroimaging studies have suggested that the neural mechanisms underlying strabismic amblyopia and anisometropic amblyopia may be ***,we performed a systematic review of magnetic resonance imaging studies investigating brain alterations in patients with these two subtypes of amblyopia;this study is registered with PROSPERO(registration ID:CRD42022349191).We searched three online databases(PubMed,EMBASE,and Web of Science) from inception to April 1,2022;39 studies with 633 patients(324patients with anisometropic amblyo pia and 309 patients with strabismic amblyopia) and 580 healthy controls met the inclusion criteria(e.g.,case-control designed,pee r-reviewed articles) and were included in this *** studies highlighted that both strabismic amblyopia and anisometropic amblyopia patients showed reduced activation and distorted topological cortical activated maps in the striate and extrastriate co rtices during tas k-based functional magnetic resonance imaging with spatial-frequency stimulus and retinotopic representations,respectively;these may have arisen from abnormal visual *** for amblyopia that are reflected in enhanced spontaneous brain function have been reported in the early visual cortices in the resting state,as well as reduced functional connectivity in the dorsal pathway and structural connections in the ventral pathway in both anisometro pic amblyopia and strabismic amblyopia *** shared dysfunction of anisometro pic amblyopia and strabismic amblyopia patients,relative to controls,is also chara cterized by reduced spontaneous brain activity in the oculomotor co rtex,mainly involving the frontal and parietal eye fields and the cerebellu m;this may underlie the neural mechanisms of fixation instability and anomalous saccades in *** regards to

关键词： amblyopia anisometropia brain function magnetic resonance imaging oculomotor system precortical pathway strabismus structure visual cortex

Effect of Na^+ on xonotlite crystals in hydrothermal synthesis

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International Journal of Minerals,Metallurgy and Materials 2013年第1期20卷 88-93页

作者： fei Liu Xiao-dan Wang jian-xin Cao School of Chemistry and Chemical Engineering Guizhou University

The effect of Na＋ ion concentration on the crystalline phase composition and morphology of xonotlite crystals pre- pared in a CaO-SiO2-H20 system via hydrothermal synthesis was analyzed. X-ray diffraction （XRD） and scanning electron mi- croscopy （SEM） results indicate that Na＋ ion concentration has a significant impact on the composition and morphology of crystalline phases in the products under the initial conditions of a molar ratio of CaO/SiO2 of 1.0 and a reactant concentration of 0.05 mol.L-1 at 225℃ for 15 h. The main crystalline phase in the products has a phase transition from xonotlite to pectolite, and the morphology changes from fibrous to broomlike shape with the Na＋ ion concentration increasing. Therefore, the content of Na^O in the raw material should be less than 5wt% for preparing pure xonotlite crystals via hydrothermal synthesis in a CaO-SiO2-H20 system.

关键词： crystals xonotlite pectolite hydrothermal synthesis morphology

Authentication scheme for industrial Internet of things based on DAG blockchain

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The Journal of China Universities of Posts and Telecommunications 2021年第6期28卷 1-12页

作者： Tang fei Dong Kun ye Zhangtao Ling Guowei College of Computer Science and Technology Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Cyber Security and Information Law Chongqing University of Posts and TelecommunicationsChongqing 400065China

Internet of things(IoT) can provide the function of product traceability for industrial systems. Emerging blockchain technology can solve the problem that the current industrial Internet of things(IIoT) system lacks unified product data sharing services. Blockchain technology based on the directed acyclic graph(DAG) structure is more suitable for high concurrency environments. But due to its distributed architecture foundation, direct storage of product data will cause authentication problems in data management. In response, IIoT based on DAG blockchain is proposed in this paper, which can provide efficient data management for product data stored on DAG blockchain, and an authentication scheme suitable for this structure is given. The security of the scheme is based on a discrete-logarithm-based assumption put forth by Lysyanskaya, Rivest, Sahai and Wolf(LRSW) who also show that it holds for generic groups. The sequential aggregation signature scheme is more secure and efficient, and the new scheme is safe in theory and it is more efficient in engineering.

关键词： industrial Internet of things(IIoT) blockchain directed acyclic graph(DAG) aggregation signature

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Influence of coating and dew point on hearth roll pickup

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Journal of Iron and Steel Research International 2019年第6期26卷 647-652页

作者： Xiao-fei Zheng Yong-lin Kang jian Zhou School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Shougang Jingtang Iron and Steel United Co. Ltd. Tangshan 063200 Hebei China

Thermal spray coatings have been widely used on hearth rolls in a continuous annealing line to improve steel sheet quality and prolong the roll service life. One of the common defects formed on a working hearth roll is the oxide pickup. The most common cause of the pickup formation is that the active Mn oxide reacts with coating. The potentials of two different coatings, CoCrAlYTa-Al2O3 (No. 1) and CoCrYNi-Y2O3 (No. 2), to duplicate pickups by reacting with Fe and Mn oxides were studied. There are three stages during pickup producing and growing. No. 2 coating effectively reduced the corrosion of Mn oxide. The characterization and modification of the surface oxide formed can be changed with different dew points. The results indicate that the dew point from — 53 to — 10 ℃ can change the depth of Mn oxide, such that an alteration can prevent the first stage and second stage and is good for preventing the pickup growing.

关键词： Pickup Coating Dew point Surface oxide Hearth roll

3D geological suitability evaluation for underground space based on the AHP-cloud model

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Underground Space 2023年第1期8卷 109-122页

作者： fei Deng jian Pu Yu Huang Qingding Han Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education Tongji UniversityShanghai 200092China Foshan Geological Bureau of Guangdong Province FoshanGuangdong 528000China

Urban development continues to reduce the amount of available ground *** development of underground space is thus gath-ering increasing attention to alleviate ground ***,there is currently a lack of a three-dimensional(3D)evaluation method to systematically evaluate the geological conditions of underground space and possible geological disaster risks caused by rock and soil *** paper presents an engineering geological suitability assessment framework based on 3D geological modeling and an analytic hierarchy process(AHP)-cloud *** the basis for 3D evaluation,a 3D structural model of the study area is established based on the drilling data and geological *** the structural model is partitioned to obtain interpolation grids,and the ordinary Kriging interpolation method is applied to attribute *** the attributes are exported from the geological model,and the rock and soil masses are divided into four categories according to their engineering properties,namely soft soil,sandy soil,cohesive soil,and rock,upon which a targeted hierarchy structure is established based on the attributes that impact the *** paper intro-duces the cloud model to characterize the uncertainty of these evaluation indexes,which synthesizes an AHP method,thus it is referred to as the AHP-cloud *** new model is used to evaluate the geological suitability of underground space in the Sanlong Bay district,Foshan City,Guangdong,*** addition,we also determine the excavation difficulty at different depths according to the lithology and weathering degree of the study *** limitations and future directions of the proposed method are discussed,including the influ-encing factors and weight determination.

关键词： 3D suitability evaluation Underground space Targeted AHP hierarchical structure Cloud model Difficulty of excavation

Text Dimensionality Reduction with Mutual Information Preserving Mapping

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Chinese Journal of Electronics 2017年第5期26卷 919-925页

作者： YANG Zhen YAO fei FAN Kefeng HUANG jian College of Computer Science Beijing University of Technology Guangxi Colleges and Universities Key Laboratory of cloud computing and complex systems Guilin University of Electronic Technology China Electronics Standardization Institute Central University of Finance and Economics

With the explosion of information,it is becoming increasingly difficult to get what is really *** reduction is the first step in efficient processing of large *** dimensionality can be reduced in many ways,little work has been done to achieve dimensionality reduction without changing the inner semantic relationship among high dimension *** remedy this problem,we introduced a manifold learning based method,named Mutual information preserving mapping(MIPM),to explore the low-dimensional,neighborhood and mutual information preserving embeddings of highdimensional *** results show that the proposed method is effective for the text dimensionality reduction *** MIPM was used to develop a temporal summarization system for efficiently monitoring the information associated with an event over *** respect to the established baselines,results of these experiments show that our method is effective in the temporal summarization.

关键词： Dimensionality reduction Manifold learning Temporal summarization Mutual information preserving mapping(MIPM)

DONOR-ACCEPTOR CONJUGATED COOLIGOMERS FOR SINGLE MOLECULE SOLAR CELLS

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Chinese Journal of Polymer Science 2013年第5期31卷 815-822页

作者： jian-fei Qu jian Liu Si-da Li Zhi-yuan Xie 耿延候 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences

Five novel donor-acceptor （D-A） conjugated cooligomers （F4B-hP, F5B-hP, F5B2[1,2]-hP, F5B2[I,3]-hP and F7B2[1,2]-hP） were synthesized. The absorption spectra of the cooligomers cover a wide range from 300 nm to 630 nm. The cooligomers could form films featured by alternating D-A lamellar nanostructures with the periods relative to the molecular lengths after thermal annealing or solvent vapor annealing. Single molecule solar cells were fabricated, and FSB-hP exhibited the best device performance. When the film of FSB-hP was thermally annealed, a power conversion efficiency （PCE） of 1.56% was realized. With solvent vapor annealing, the PCE could be further improved to 1.72% with a short-circuit current （J_SC） of 5.76 mA/cm2, an open-circuit voltage （Voc） of 0.87 V and a fill factor （FF） of 0.34.

关键词： Single molecule solar cells Monodisperse conjugated oligomers Lamellar nanostructures Bulk heterojunctionsolar cells.