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| 1 | Excellent complete conversion activity for methane and CO of Pd/TiO_2-Zr_(0.5)Al_(0.5)O_(1.75) catalyst used in lean-burn natural gas vehicles显示文摘Palladium catalysts are supported on TiO2, ZrO2, Al2O3, Zr0.5Al0.5O1.75 and TiO2-Zr0.5Al0.5O1.75 prepared by co-precipitation method, respectively. Catalytic activities for methane and CO oxidation are evaluated in a gas mixture that simulated the exhaust from lean-burn natural gas vehicles(NGVs). Pd/TiO2-Zr0.5Al0.5O1.75 performs the best catalytic activity among the tested five catalysts. For CH4, the light-off temperature(T50) is 254℃, and the complete conversion temperature(T90) is 280℃; for CO, T50 is 84℃, and T90 was 96℃. Various techniques, including N2adsorption-desorption, X-ray diffraction(XRD), H2-temperature-programmed reduction(H2-TPR), X-ray photoelectron spectroscopy(XPS), and scanning electron microscopy(SEM) are employed to characterize the effect of supports on the physicochemical properties of prepared catalysts. N2adsorption-desorption and SEM show that TiO2-Zr0.5Al0.5O1.75 expresses uniform nano-particles and large meso-pore diameters of 26 nm. H2-TPR and XRD indicate that PdO is well dispersed on the supports and strongly interacted with each other. The results of XPS show that the electron density around PdO and the proportion of active oxygen on TiO2-Zr0.5Al0.5O1.75 are maxima among the five supports. | Yun Wang Haidi Xu Hongyan Shang Maochu Gong Yaoqiang Chen | 2014 | Journal of Energy Chemistry2014，23，4： | 3 |
| 2 | Agronomic cultivation measures on productivity of oilseed flax:A review显示文摘Oilseed flax is one of the most important oil crops in China.With the improvement of people's living standards and the deepening knowledge of the nutritional value of oilseed flax,the demand and economic value of oilseed flax are increasing,and the cultivated area in China is expanding.However,the grain yield of oilseed flax is lower than other oil crops.It varies significantly from year to year,combined with a lower degree of mechanization,which has greatly limited the healthy development of the flax industry.Some of the effects of agronomic measures on productivity and water use efficiency of oilseed flax are reviewed in this paper.The major agronomic strategies for the productivity of oilseed flax were presented based on fertilization,plant density,irrigation,cropping pattern and weed control.Future research should investigate the effect of silicon and potassium fertilizers on the mechanism of lodging resistance of oilseed flax,the effects of diversified cropping systems(strip intercropping and crop rotation)on high and stable productivity and efficient utilization of resources. | Zhengjun Cui Bin Yan Yuhong Gao Bing Wu Yifan Wang Haidi Wang Peng Xu Bangqing Zhao Zhi Cao Yong Zhang Yaping Xie Yapeng Hu Xingbang Ma Junyi Niu | 2022 | Oil Crop Science2022，7，1： | 1 |
| 3 | The influence of molar ratios of Ce/Zr on the selective catalytic reduction of NO_x with NH_3 over Fe_2O_3-WO_3/Ce_xZr_(1-x)O_2(0≤x≤1) monolith catalyst显示文摘A series of CexZr1-xO2(0 B x B 1)with different molar ratios of Ce/Zr were syhthesized via coprecipitation method,and Fe2O3-WO3/CexZr1-xO2monolithic catalysts were prepared for selective catalytic reduction of nitrogen oxides by ammonia(NH3-SCR).The structural properties and redox behavior of the catalysts were comprehensively characterized by N2physisorption,X-ray diffraction(XRD),X-ray photoelectron spectra(XPS),H2-temperature programmed reduction(H2-TPR)and activity measurement for NH3-SCR.The results showed that the NH3-SCR activities of the catalysts were gradually enhanced by increasing the molar ratios of Ce/Zr,especially the lowtemperature catalytic activity and the reaction temperature window.Fe2O3-WO3/Ce0.68Zr0.32O2monolithic catalyst presented the best NH3-SCR activity among the investigated catalysts,more than 90%NOxcould be removed in the temperature range of 247–454°C on the catalyst under the gas hourly space velocities of 30,000 h-1.And it always held more than 99%N2selectivity and less than 20 ppm(1 ppm=10-6L/L)N2O generation concentration between 200 and500°C,the catalyst also displayed its strong resistance of H2O and SO2.Good textural and structural properties,more surface Fe,Ce and active oxygen were together contributed to the excellent NH3-SCR performance of Fe2O3-WO3/Ce0.68Zr0.32O2catalyst. | Haidi Xu Yi Cao Yun Wang Zhitao Fang Tao Lin Maochu Gong Yaoqiang Chen | 2014 | Chinese Science Bulletin2014，59，31： | 1 |
| 4 | Laboratory Experiments on an Internal Solitary Wave over a Triangular Barrier显示文摘Laboratory experiments were conducted to investigate the evolution of interfacial internal solitary waves(ISWs)incident on a triangular barrier.ISWs with different amplitudes were generated by gravitational collapse.The ISW energy dissipation and turbulence processes were calculated as waves passed over the triangular barrier.Experimental results showed that ISWs were reflecting back off the triangular barrier,and shoaling ISWs led to wave breaking and mixing when waves propagated over the obstacle.Wave instability created the dissipation of energy as it was transmitted from waves to turbulence.The rate of ISW energy dissipation,the maximum turbulent dissipation,and the buoyancy diffusivity linearly increased with the increase in the incident wave energy. | MU Haidi CHEN Xu LI Qun | 2019 | Journal of Ocean University of China2019，18，5： | 1 |
| 5 | Experimental investigation on the optical remote sensing images of internal solitary waves with a smooth surface显示文摘The parameter inversion of internal solitary waves (ISWs) based on optical remote sensing images is a key work. A new approach is proposed and demonstrated for simulating the optical remote sensing images of ISWs with a smooth surface in the laboratory. An optical remote sensing simulation system used to detect ISWs is constructed by a two-dimensional ISW flume, a LED (light emitting diode) light source and two CCD (charge coupled device) cameras. The optical remote sensing images of the horizontal surface and ISWs propagation images of a vertical side are detected simultaneously, which aims to explore the response of optical remote sensing corresponding to ISWs with the smooth surface. The results show that during the propagation of ISWs, dark pattern images are obtained by CCD 1 camera. The characteristics of the dark patterns vary along with the incident angle of the light source. The characteristic parameters of the optical remote sensing images correspond to the wave factors of vertical profiles. The experiment also shows a positive correlation between the dark pattern width and the half wave width under different amplitudes of ISWs. The system has the advantages of clear phenomenon and high repeatability, which provides the scientific basis for quantitative investigation on imaging mechanism of ISW by optical remote sensing. | Yuan Mei Jing Wang Songsong Huang Haidi Mu Xu Chen | 2019 | Acta Oceanologica Sinica2019，38，6： | 1 |
| 6 | MEN1 promotes ferroptosis by inhibiting mTOR-SCD1 axis in pancreatic neuroendocrine tumors显示文摘Pancreatic neuroendocrine tumor(pNET)is the second most common malignant tumors of the pancreas.Multiple endocrine neoplasia 1(MEN1)is the most frequently mutated gene in pNETs and MEN1-encoded protein,menin,is a scaffold protein that interacts with transcription factors and chromatin-modifying proteins to regulate various signaling pathways.However,the role of MEN1 in lipid metabolism has not been studied in pNETs.In this study,we perform targeted metabolomics analysis and find that MEN1 promotes the generation and oxidation of polyunsaturated fat acids(PUFAs).Meanwhile lipid peroxidation is a hallmark of ferroptosis,and we confirm that MEN1 promotes ferroptosis by inhibiting the activation of mTOR signaling which is the central hub of metabolism.We show that stearoyl-coA desaturase(SCD1)is the downstream of MEN1-mTOR signaling and oleic acid(OA),a metabolite of SCD1,recues the lipid peroxidation caused by MEN1 overexpression.The negative correlation between MEN1 and SCD1 is further verified in clinical specimens.Furthermore,we find that BON-1 and QGP-1 cells with MEN1 overexpression are more sensitive to everolimus,a widely used drug in pNETs that targets mTOR signaling.In addition,combined use everolimus with ferroptosis inducer,RSL3,possesses a more powerful ability to kill cells,which may provide a new strategy for the comprehensive therapy of pNETs. | Zeng Ye Haidi Chen Shunrong Ji Yuheng Hu Xin Lou Wuhu Zhang Desheng Jing Guixiong Fan Yue Zhang Xuemin Chen Qifeng Zhuo Jie Chen Xiaowu Xu Xianjun Yu Jin Xu Yi Qin Heli Gao | 2022 | Acta Biochimica et Biophysica Sinica2022，54，11： | 0 |
| 7 | Optimization of Hybrid Crystal with SAPO-5/34 on Hydrothermal Stability for deNOx Reaction by NH3显示文摘In order to deal with the challenge of the hydrothermal deactivation of selective catalytic reduction of NO by NH3(NH3-SCR)catalyst and extend its lifetime,a novel Cu/SAPO-5/34 catalyst was prepared,and it almostmaintains its deNOx performance with a high conversion rate of 90%NO,between 175℃and 400℃after under-going the rigorous treatment at 800℃for 12 h.Thus,Cu/SAPO-5/34 is more recalcitrant to the high-temperature hydrothermal deactivation than Cu/SAPO-34.Besides,the formation of N20 is always below 3×10^-6(3 ppm)during the whole reaction temperature.performing an advanced catalytic selectivity.The effect of high-temperature hvdro-thermal treatment on the morphology,structure and texture property,the acid sites,as well as the active copper spe cies were investigated.These characterizations manifest that the optimized high-temperature hydrothermal stability is associated closely with the good structural stability over Cu/SAPO-5/34-HT.which facilitates to preserve reaction sites,and then showing the better hydrothermal stability than Cu/SAPO-34. | LIN Qingjin LIN Chenlu LIU Jingying LIU Shuang XU Haidi CHEN Yaoqiang DAN Yi | 2020 | Chemical Research in Chinese Universities2020，36，6： | 0 |
| 8 | Enhancing tylosin production by combinatorial overexpression of efflux,SAM biosynthesis,and regulatory genes in hyperproducing Streptomyces xinghaiensis strain显示文摘Tylosin is a 16-membered macrolide antibiotic widely used in veterinary medicine to control infections caused by Gram-positive pathogens and mycoplasmas.To improve the fermentation titer of tylosin in the hyperproducing Streptomyces xinghaiensis strain TL01,we sequenced its whole genome and identified the biosynthetic gene cluster therein.Overexpression of the tylosin efflux gene tlrC,the cluster-situated S-adenosyl methionine(SAM)synthetase gene metK_(cs),the SAM biosynthetic genes adoK_(cs)-metFcs,or the pathway-specific activator gene tylR enhanced tylosin production by 18%,12%,11%,and 11%in the respective engineered strains TLPH08-2,TLPH09,TLPH10,and TLPH12.Co-overexpression of metK_(cs)and adoK_(cs)-metFcs as two transcripts increased tylosin production by 22%in the resultant strain TLPH11 compared to that in TL01.Furthermore,combinational overexpression of tlrC,metK_(cs),adoK_(cs)-metFcs,and tylR as four transcripts increased tylosin production by 23%(10.93g/L)in the resultant strain TLPH17 compared to that in TL01.However,a negligible additive effect was displayed upon combinational overexpression in TLPH17 as suggested by the limited increment of fermentation titer compared to that in TLPH08-2.Transcription analyses indicated that the expression of tlrC and three SAM biosynthetic genes in TLPH17 was considerably lower than that of TLPH08-2 and TLPH11.Based on this observation,the five genes were rearranged into one or two operons to coordinate their overexpression,yielding two engineered strains TLPH23 and TLPH24,and leading to further enhancement of tylosin production over TLPH17.In particular,the production of TLPH23 reached 11.35 g/L.These findings indicated that the combinatorial strategy is a promising approach for enhancing tylosin production in high-yielding industrial strains. | Penghui Dai Yuyao Qin Luyuan Li Haidi Li Lihuo Lv Danying Xu Yuqing Song Tingting Huang Shuangjun Lin Zixin Deng Meifeng Tao | 2023 | Synthetic and Systems Biotechnology2023，8，3： | 0 |
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