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A gating ultramicroporous metal-organic framework showing high adsorption selectivity,capacity and rate for xylene separation

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Science China Chemistry 2022年第8期65卷 1552-1558页

作者： Zi-Ming Ye Xue-Feng Zhang De-Xuan Liu Yan-Tong Xu Chao Wang Kai Zheng Dong-Dong Zhou Chun-Ting He Jie-Peng Zhang Key Laboratory of Bioinorganic and Synthetic Chemistry(Ministry of Education) School of ChemistrySun Yat-Sen UniversityGuangzhou 510275China Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education/National Engineering Research Center for Carbohydrate Synthesis Jiangxi Normal UniversityNanchang 330022China 3.Guangdong Provincial Key Laboratory of New and Renewable Energy Research and DevelopmentGuangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China

Adsorptive separation of p-xylene(pX)from xylene isomers is a key process in chemical industry,but known adsorbents cannot simultaneously achieve high adsorption selectivity,capacity,and ***,we demonstrate gating ultramicropore as a solution for this *** modification of the synthetic condition gives rise to isomeric metal-organic frameworksα-[Zn(pba)](MAF-88,H2pba=4-(1H-pyrazol-4-yl)benzoic acid)andβ-[Zn(pba)](MAF-89)possessing similar pillared-column structures,porosities,and high pX capacities of 2.0 mmol g^(−1),but very different framework/pore topologies,pore sizes,and pX *** binary and ternary mixtures of liquid xylene isomers,MAF-88 with narrow one-dimensional(1D)channels shows pX selectivity of 11 and 1.6,while MAF-89 with 3D-connected quasi-discrete pores shows pX selectivity up to 221 and 46,***,differential scanning calorimetry,and time-dependent separation experiments reveal that the kinetic effects of the gating pores play more important roles than the thermodynamic effects,which is further confirmed by single-crystal X-ray diffraction and computational simulations.

关键词： metal-organic frameworks gating xylene adsorption separation

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Electron transmission ef f iciency of gating-GEM foil for TPC

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Chinese Physics C 2012年第4期36卷 339-343页

作者：谢文庆黄孟李婷田阳李玉兰李元景 Department of Engineering Physics Tsinghua University Key Laboratory of Particle & Radiation Imaging (Tsinghua University) Ministry of Education

In a TPC, ion feedback from the readout detector can cause a space-charge effect and distort the electrical field in the drift region. gating is one of the effective methods to solve this problem, which can block ions at the expense of losing a certain amount of primary electrons. Compared with the traditional design with a wire structure, gating based on GEM foil is more attractive because of its simplicity. In this paper, the factors influencing the electron transmission efficiency are studied with simulations and experiments. After optimizing all these parameters, an electron transmission efficiency over 80% is obtained.

关键词： GEM gating electron transmission efficiency TPC

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gating system optimization of high pressure die casting thin-wall AlSi10MnMg longitudinal loadbearing beam based on numerical simulation

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China Foundry 2018年第6期15卷 436-442页

作者： Xu Zhao Ping Wang Tao Li Bo-yu Zhang Peng Wang Guan-zhou Wang Shi-qi Lu Key Laboratory of Electromagnetic Processing of Materials Northeastern University

High pressure die casting(HPDC) is a kind of near net shape manufacturing method. However, air entrapment in HPDC parts has serious effects upon the casting quality. In order to reduce the air entrapment defects in a AlSi10 MnMg alloy thin-wall longitudinal load-bearing beam produced by HPDC, different gating systems were designed and simulated by software Flow-3D to evaluate the entrapped air. Simulation results showed that when the beam is produced by the original designed gating system with a middle ingate, there exist obvious air entrapments in the critical area; the volume of air entrapment was reduced by replacing the middle ingate to an overflow well, and the filling of molten metal became more stable. When the middle ingate was removed for further improvement, the volume of air entrapment was decreased drastically. The parts with glossy surface and good microstructure have been successfully produced by using the final optimized gating system based on simulation results.

关键词： AlSi10MnMg high pressure die casting gating system optimization numerical simulation

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Ionic-Liquid-gating Induced Protonation and Superconductivity in FeSe,FeSe0.93S0.07, ZrNCl, 1T-TaS2 and Bi2Se3

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Chinese Physics Letters 2019年第7期36卷 90-93页

作者： Yi Cui Ze Hu Jin-Shan Zhang Wen-Long Ma Ming-Wei Ma Zhen Ma Cong Wang Jia-Qiang Yan Jian-Ping Sun Jin-Guang Cheng Shuang Jia Yuan Li Jin-Sheng Wen He-Chang Lei Pu Yu Wei Ji Wei-Qiang Yu School of Mathematics and Physics North China Electric Power University Beijing 102206 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Renmin University Beijing 100872 International Center for Quantum Materials School of Physics Peking University Beijing 100871 National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 7Collaborative Innovation Center of Quantum Matter Beijing 100871 Innovative Center for Advanced Microstructures Nanjing University Nanjing 210093 State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084

We report protonation in several compounds by an ionic-liquid-gating method, under optimized gating *** leads to single superconducting phases for several compounds. Non-volatility of protons allows post-gating magnetization and transport measurements. The superconducting transition temperature Tc is enhanced to 43.5 K for FeSe0.93S0.07, and 41 K for Fe Se after protonation. Superconducting transitions with Tc^15 K for ZrNCl,~7.2 K for 1-TaS2, and ~3.8 K for Bi2Se3 are induced after protonation. Electric transport in protonated FeSe0.93S0.07 confirms high-temperature superconductivity. Our ^1H nuclear magnetic resonance(NMR)measurements on protonated Fe Se1-xSx reveal enhanced spin-lattice relaxation rate 1/^1T1 with increasing x,which is consistent with the LDA calculations that H+ is located in the interstitial sites close to the anions.

关键词： compounds by an optimized gating conditions close to the anions

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Imaging through flesh tissue using fs electronic holographic gating method

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Science China Mathematics 1999年第8期42卷 852-858页

作者：侯比学陈国夫郝志琦丰善王淑岩王屹山王国志 1. State Key Laboratory of Transient Optics Technology Xi’an Institute of Optics and Precision Mechanics 710068 Xi’an China

The experimental results of imaging through flesh tissue using fs electronic holographic gating method is reported. In the experiment, Ti: sapphire mode-locked laser is used as light source, of which the repetition rate is 100 MHz, central wavelength 800 nm, duration of pulse 20 fs, output power 80 mW. Tissue is a 7 mm thick chicken slice, and the imaged object is a metal wire with diameter of 0.5 mm. A general CCD is used to record holograms and a clear image of metal wire is obtained. Several relevant problems are discussed.

关键词： electronic holography gating flesh tissue imaging.

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Plasma-mirror frequency-resolved optical gating for simultaneous retrieval of a chirped vacuum-ultraviolet waveform and time-dependent reflectivity

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High Power Laser Science and Engineering 2016年第2期4卷 80-84页

作者： Ryuji Itakura Takayuki Kumada Motoyoshi Nakano Hiroshi Akagi Kansai Photon Science Institute National Institutes for Quantum and Radiological Science and Technology(QST) Nuclear Science and Research Institute Japan Atomic Energy Agency Department of Chemistry Graduate School of ScienceTohoku University

We demonstrate that the methodology of frequency-resolved optical gating(FROG) is applicable to time-resolved reflection spectroscopy of a plasma mirror in the vacuum-ultraviolet(VUV) region. Our recent study [R. Itakura et al. Opt. Express 23, 10914(2015)] has shown that a VUV waveform can be retrieved from a VUV reflection spectrogram of a plasma mirror formed on a fused silica(FS) surface by irradiation with an intense femtosecond laser pulse. Simultaneously, the increase in the reflectivity with respect to the Fresnel reflection of the unexcited FS surface can be obtained as a time-dependent reflectivity of the plasma mirror. In this study, we update the FROG analysis procedure using the least-square generalized projections algorithm. This procedure can reach convergence much faster than the previous one and has no aliasing problem. It is demonstrated that a significantly chirped VUV pulse as long as 1 ps can be precisely characterized.

关键词： frequency-resolved optical gating least-square generalized projections algorithm plasma mirror vacuum ultraviolet

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Double-gating mechanism and diversity of an adenosine triphosphate (ATP)-sensitive K^+ channel in neurons acutely dissociated from rat neocortex

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Science China(Life Sciences) 1997年第1期40卷 10-17页

作者：佟振清唐向东杨文俊 Department of Physiology First Military Medical University Guangzhou 510515 China

Classically, ion channels are classified into 2 groups: chemical-sensitive (ligand-gated) and voltage-sensitive channels. Single ATP-sensitive K+ (K-ATP) channel currents were recorded in acutely dissociated rat neo-cortical neurons using patch clamp technique. A type of K-ATP channel has been found to be gated not only by intra-cellular ATP, but also by membrane potential ( Vm) , and proved to be a novel mechanism underlying the gating of ion channels, namely bi-gating mechanism. The results also show that the K-ATP channels possess heterogeneity and di-versity. These types of K-ATP channels have been identified in 40.12% of all patches, which are different in activa-tion-threshold and voltage-sensitivity. The present experiment studied the type-3 K-ATP channel with a unitary con-ductance of about 80 pS in detail ( n = 15). Taking account of all the available data, a variety of K-ATP channels are suggested to exist in body, and one type of them is bi-gated by both chemical substances and membrane potentials. This property of the K-ATP channels may be related to their pathophysiblogical function.

关键词： ATP-sensitive K^+ channel gating kinetics patch clamp dissociated neuron rat.

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Effect of gating currents of ion channels on the collective spiking activity of coupled Hodgkin-Huxley neurons

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Science China Chemistry 2009年第1期52卷 20-25页

作者： YuBing Gong YanHang Xie Bo Xu XiaoGuang Ma School of Physics & Electronic Engineering Ludong University Yantai 264025 China

Based on the coupled stochastic Hodgkin-Huxley neurons, we numerically studied the effect of gating currents of ion channels, as well as coupling and the number of neurons, on the collective spiking rate and regularity in the coupled system. It was found, for a given coupling strength and with a relatively large number of neurons, when gating currents are applied, the collective spiking regularity decreases; meanwhile, the collective spiking rate increases, indicating that gating currents can aggravate the de-synchronization of the spikings of all neurons. However, gating currents caused hardly any effect in the spiking of any individual neuron of the coupled system. This result, different from the reduction of the spiking rate by gating currents in a single neuron, provides a new insight into the effect of gating cur-rents on the global information processing and signal transduction in real neural systems.

关键词： neuron gating current channel noise kinetics stochastic process

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‘C-type’ closed state and gating mechanisms of K2P channels revealed by conformational changes of the TREK-1 channel

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Journal of Molecular Cell Biology 2022年第1期14卷 47-55页

作者： Qiansen Zhang Jie Fu Shaoying Zhang Peipei Guo Shĳie Liu Juwen Shen Jiangtao Guo Huaiyu Yang Shanghai Key Laboratory of Regulatory Biology Institute of Biomedical SciencesSchool of Life SciencesEast China Normal UniversityShanghai 200241China Department of Biophysics and Department of Pathology of Sir Run Run Shaw Hospital Zhejiang University School of MedicineHangzhou 310058China

Two-pore domain potassium (K2P) channels gate primarily within the selectivity filter, termed ‘C-type’ gating. Due to the lack of structural insights into the nonconductive (closed) state, ‘C-type’ gating mechanisms remain elusive. Here, molecular dynamics (MD) simulations on TREK-1, a K2P channel, revealed that M4 helix movements induce filter closing in a novel ‘deeper-down’ structure that represents a ‘C-type’ closed state. The ‘down’ structure does not represent the closed state as previously proposed and instead acts as an intermediate state in gating. The study identified the allosteric ‘seesaw’ mechanism of M4 helix movements in modulating filter closing. Finally, guided by this recognition of K2P gating mechanisms, MD simulations revealed that gain-of-function mutations and small-molecule activators activate TREK-1 by perturbing state transitions from open to closed states. Together, we reveal a ‘C-type’ closed state and provide mechanical insights into gating procedures and allosteric regulations for K2P channels.

关键词： K2P state selectivity filter C-type gating

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gating技术与汉语听觉词汇加工

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心理学报 2003年第5期35卷 582-590页

作者：武宁宁舒华北京师范大学心理学院北京100875

尝试对gating技术的实施和运用 ,对数据进行探索性分析。被试为 47名北京师范大学本科学生。实验中被试听到依次加长的单字词语音片段 ,每听完一个语音片段要尽快判断该语音是什么字音 ,并迅速写出想到的第一个符合该读音的汉字 ,同时... 详细信息

尝试对gating技术的实施和运用 ,对数据进行探索性分析。被试为 47名北京师范大学本科学生。实验中被试听到依次加长的单字词语音片段 ,每听完一个语音片段要尽快判断该语音是什么字音 ,并迅速写出想到的第一个符合该读音的汉字 ,同时在七点量表上评定作出判断的确定性等级。结果显示 ,gating技术作为探讨汉语听觉词汇加工的一条途径可以提供丰富的信息 ,它不仅能得到词汇的语音识别点 (IsolationPoint ,IP) ,也揭示出它与声调存在一定关系。对错误反应的分析还表明 :声调信息可以独立于音段信息而被识别 ;即时影响声调识别的因素不一定局限于区别性特征 ;听觉词汇识别受到听觉语言特有的方向性特点的影响 ,这种影响不仅体现在音段信息。

关键词： gating 听觉词汇汉语声调

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