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| 1 | Investigation of the characteristics and deactivation of catalytic active center of Cr-Al_2O_3 catalysts for isobutane dehydrogenation显示文摘Deactivation mechanism of Cr-Al2O3 catalyst and the interaction of Cr-Al in the dehydrogenation of isobutane, as well as the nature of the catalytic active center, were studied using XRD, SEM, XPS, H2-TPR, isobutane-TPR and TPO techniques. The results revealed that the deactivation of Cr-Al2O3 catalyst was mainly caused by carbon deposition on its surface. The Cr3+ion could not be reduced by hydrogen but could be reduced to Cr2+by hydrocarbons and monoxide carbon. The active center for isobutane dehydrogenation could be Cr2+/Cr3+produced from Cr6+by the on line reduction of hydrocarbon and carbon monoxide. The binding energy of Al3+was strongly affected by the state of chromium cations in the catalysts. | Deren Fang Jinbo Zhao Wanjun Li Xu Fang Xin Yang Wanzhong Ren Huimin Zhang | 2015 | Journal of Energy Chemistry2015，24，1： | 8 |
| 2 | Synthesis and applications of mesoporous Cu-Zn-Al_2O_3 catalyst for dehydrogenation of 2-butanol显示文摘A series of mesoporous Cu-Zn-Al2O3 materials have been synthesized at ambient temperature and their structure was characterized by XRD, N2 physical adsorption and TPR techniques. Their catalytic applications for the dehydrogenation of 2-butanol to methyl ethyl ketone (MEK) were evaluated in a fixed-bed flow reactor at atmospheric pressure. It is demonstrated from the XRD patterns that both the as-synthesized samples and calcined samples have the typical XRD patterns of meso-structured materials and the results of N2O chemical adsorption showed that Cu was embedded in the framework of the mesoporous materials and homogeneously dispersed in the mesoporous Cu-Zn-Al2O3 materials. The catalytic activity of 2-butanol dehydrogenation was varied in the order of CZA(10) | Deren Fang Wanzhong Ren Zhongmin Liu Xiufeng Xu Lei Xu Hongying Lǔ Weiping Liao Huimin Zhang | 2009 | Journal of Natural Gas Chemistry2009，18，2： | 7 |
| 3 | Atomistic Surface Passivation of CH_(3)NH_(3)PbI_(3) Perovskite Single Crystals for Highly Sensitive Coplanar-Structure X-Ray Detectors显示文摘Organic-inorganic halide perovskites(OIHPs)are recognized as the promising next-generation X-ray detection materials.However,the device performance is largely limited by the ion migration issue of OIHPs.Here,we reported a simple atomistic surface passivation strategy with methylammonium iodide(MAI)to remarkably increase the ion migration activation energy of CH_(3)NH_(3)PbI_(3)single crystals.The amount of MAI deposited on the crystal surface is finely regulated by a self-assemble process to effectively suppress the metallic lead defects,while not introducing extra mobile ions,which results in significantly improved dark current stability of the coplanar-structure devices under a large electric field of 100Vmm^(-1).The X-ray detectors hence exhibit a record-high sensitivity above 700,000μC Gy^(-1)_(air) cm^(-2)under continuum X-ray irradiation with energy up to 50 keV,which enables an ultralow X-ray detection limit down to 1.5 nGy_(air)s^(-1).Our findings will allow for the dramatically reduced X-ray exposure of human bodies in medical imaging applications. | Yilong Song Liqi Li Weihui Bi Mingwei Hao Yifei Kang Anran Wang Zisheng Wang Hanming Li Xiaohui Li Yanjun Fang Deren Yang Qingfeng Dong | 2020 | Research2020，，1： | 5 |
| 4 | Influence of post-grown treatments on CuInS_2 thin films prepared by sulphurization of Cu-In films显示文摘Polycrystalline CuInS2 (CIS) films were prepared by sulphurization of Cu-In films. The surface morphology and phase composition of the as-grown film, the KCN-etched film, and the annealed KCN-etched film were investigated. During the sulphurization, the secondary CuxS phase segregated on the surface of the as-grown films. To improve the crystalline quality of CuInS2 films, a series of post-grown treatments, such as KCN-etching and vacuum annealing KCN-etched films, were performed on the as-grown films. Both as-grown and post-treated films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results indicated that a CuxS secondary phase segregated on the surface of the as-grown film, which could be removed effectively by KCN etching. After the vacuum annealing treatment, the KCN-etched film had a sphalerite structure with (112) preferred orientation. Meanwhile, the crystalline quality of the CIS film was significantly improved, which provided a novel method to improve the performance of thin film solar cells. | YAN Youhua LIU Yingchun FANG Ling ZHAO Haihua LI Deren LU Zhichao ZHOU Shaoxiong | 2008 | Rare Metals2008，27，5： | 2 |
| 5 | Partial amination of cationic exchange resins and its application in the hydration of butene显示文摘In this work,the amination of sulfonated polystyrene resin with alkyl secondary amine is investigated.The catalytic activities of the modified resins are determined through the hydration of 1-butene.The optimum chain length and the best range of amination rate are determined.It is found that the single-pass conversion of 1-butene was raised 2% on average,and the relative activity was increased over 30% after modification.A hypothesis about the enhancement of catalytic activities by the inclusion of alkyl chain to wrap up the butene molecule is proposed. | Deren Fang Wanzhong Ren] Hongying Lu Hongtao Yang | 2012 | Journal of Natural Gas Chemistry2012，21，3： | 2 |
| 6 | Influence of Reaction Conditions on Methanol Synthesis and WGS Reaction in the Syngas-to-DME Process显示文摘一系列 CuO-ZnO 催化剂(与不同 Cu/Zn 摩尔比率) 与三种 feed 气体和不同空间速度在 syngas-to-dimethyl 醚(DME ) 的反应条件下面被准备,并且评估。催化剂被 X 射线衍射(XRD ) 和规划温度的减小(TPR ) 描绘。实验结果证明 syngas-to-DME 过程的反应条件极大地影响了甲醇合成和 WGS 反应。Cu/Zn 摩尔比率引起的影响在二反应上是相当不同的;CO2 的百分比增加在喂气体为催化剂活动是相反的,并且也禁止了两反应;反应空间速度的改进重重地影响了催化剂的表演,并且好处是相对为甲醇合成的更少比为 WGS 反应。给词调音:铜;锌;Cu/Zn 摩尔比率;甲醇;暗淡乙醇醚;水煤气转移反应;syngas; | Ligang Wang Deren Fang Xingyun Huang Shigang Zhang Yue Qi Zhongmin Liu | 2006 | Journal of Natural Gas Chemistry2006，15，1： | 2 |
| 7 | Object Classification of Aerial Image with Bag-of-Visual-Words显示文摘 | Xu Sheng Fang Tao Li Deren | 2010 | IEEE Geoscience and Remote Sensing Letters2010，7，2： | 1 |
| 8 | Research on the Acidity of the Double-function Catalyst for DME Synthesis from Syngas显示文摘 | Ligang Wang Yue Qi Yingxu Wei Deren Fang Shuanghe Meng Zhongmin Liu | 2006 | Catalysis Letters (-)2006，，1： | 1 |
| 9 | Non-rigid registration of mural images and laser scanning data based on the optimization of the edges of interest显示文摘The orientation and correction of mural images by registering them with laser scanning data is critical for the digital protection of ancient murals.This paper proposes a method for the non-rigid registration of mural images and laser scanning data based on the optimization of the edge of interest by using laser echo intensity information as an intermediary.First,the intensity image was generated from the laser echo intensity information,and registered with the mural image using a rigid transformation model.Second,the edges of interest in the mural image and the gradient field of the intensity images were processed as registration primitives.Third,every edge of interest was registered with the optimization base used in the rigid registration of the mural image and intensity image.Finally,the registration was completed after a non-rigid transformation model between these two images was constructed using the control points on the optimized edges.Our experimental results show that the proposed method can obtain high registration accuracy for different data sets. | ZHANG Fan HUANG XianFeng FANG Wei LI DeRen | 2013 | Science China(Information Sciences)2013，56，6： | 1 |
| 10 | A New Generation of Intelligent Mapping and Remote Sensing Scientific Test Satellite Luojia-301显示文摘With the continuous improvement of the performance and the increasing variety of optical mapping and remote sensing satellites,they have become an important support for obtaining global accurate surveying and mapping remote sensing information.At present,optical mapping and remote sensing satellites already have sub-meter spatial resolution capabilities,but there is a serious lag problem in mapping and remote sensing information services.It is urgent to develop intelligent mapping and remote sensing satellites to promote the transformation and upgrading to real-time intelligent services.Firstly,based on the three imaging systems of the optical mapping and remote sensing satellites and their realization methods and application characteristics,this paper analyzes the applicable system of the intelligent mapping and remote sensing satellites.Further,according to the application requirements of real-time,intelligence,and popularization,puts forward the design concept of integrated intelligent remote sensing satellite integrating communication,navigation,and remote sensing and focuses on the service mode and integrated function composition of intelligent remote sensing satellite.Then expounds on the performance and characteristics of the Luojia-301 satellite,a new generation of intelligent surveying and mapping remote sensing scientific test satellite.And finally summarizes and prospects the development and mission of intelligent mapping remote sensing satellites.Luojia-301 satellite integrates remote sensing and communication functions.It explores an efficient and intelligent service mode of mapping and remote sensing information from data acquisition to the application terminal and provides a real service verification platform for on-orbit processing and real-time transmission of remote sensing data based on space-ground internet,which is of great significance to the construction of China’s spatial information network. | Deren LI Mi WANG Fang YANG | 2023 | Journal of Geodesy and Geoinformation Science2023，6，2： | 0 |
| 11 | Development of robust perovskite single crystal radiation detectors with high spectral resolution through synergetic trap deactivation and self-healing显示文摘Organic-inorganic halide perovskite single crystals(SCs)are promising materials for detecting ionizing radiation owing to their outstanding photoelectric conversion capability and inexpensive solution processability.However,the accuracy and stability of the detectors have been limited due to the charge traps and defects in SCs,especially when operated under high-precision photon-counting mode for energy spectrum acquisition.Here,we proposed a trap freezing deactivation route,which obviously suppressed dark current and noise by up to 97%and 92%,respectively.Furthermore,the bulk ion migration effect was essential for the ability to instantly self-heal defects induced by radiation damage at temperatures down to30C.Consequently,the detector exhibits a record high energy resolution of 7.5%at 59.5 keV for 241Amγ-ray source,which is the best solution-processed semiconductor radiation detectors at the same energy range.In addition,the detector maintains over 90%of its initial performance after 9 months of storage when tested in the air.Our results will represent a revision of the paradigm that high-spectral-resolution and robust radiation detectors can only be realized with high temperature grown inorganic semiconductor single crystals. | Lixiang Wang Yilong Song Liqi Li Liting Tao Minxing Yan Weihui Bi Xueying Yang Yuan Sun Qingfeng Dong Deren Yang Yanjun Fang | 2023 | InfoMat2023，5，9： | 0 |
| 12 | Detector-grade perovskite single-crystal wafers via stress-free gel-confined solution growth targeting high-resolution ionizing radiation显示文摘Solution-processed organic‒inorganic halide perovskite(OIHP)single crystals(SCs)have demonstrated great potential in ionizing radiation detection due to their outstanding charge transport properties and low-cost preparation.However,the energy resolution(ER)and stability of OIHP detectors still lag far behind those of melt-grown inorganic perovskite and commercial CdZnTe counterparts due to the absence of detector-grade high-quality OIHP SCs.Here,we reveal that the crystallinity and uniformity of OIHP SCs are drastically improved by relieving interfacial stress with a facial gel-confined solution growth strategy,thus enabling the direct preparation of large-area detector-grade SC wafers up to 4 cm with drastically suppressed electronic and ionic defects.The resultant radiation detectors show both a small dark current below 1 nA and excellent baseline stability of 4.0×10^(-8) nA cm^(-1) s^(-1) V^(-1),which are rarely realized in OIHP detectors.Consequently,a record high ER of 4.9% at 59.5 keV is achieved under a standard 241Am gamma-ray source with an ultralow operating bias of 5 V,representing the best gamma-ray spectroscopy performance among all solution-processed semiconductor radiation detectors ever reported. | Yilong Song Lixiang Wang Yongqiang Shi Weihui Bi Jianwu Chen Mingwei Hao Anran Wang Xueying Yang Yuan Sun Fan Yu Liansheng Li Yanjun Fang Deren Yang Qingfeng Dong | 2023 | Light(Science & Applications)2023，12，5： | 0 |
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