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Effective inhibit energetic cost in stimulated Raman shortcut-to-adiabatic passage

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Communications in Theoretical Physics 2021年第2期73卷 78-81页

作者： feng-yang zhang Zhi-Qing feng Chong Li School of Physics and Materials Engineeing Dalian Minzu UniversityDalian 116600China 2 Department of PhysicsTsinghua UniversityBeijing100084China Department of Physics Tsinghua UniversityBeijing100084China School of Physics Dalian University of TechnologyDalian 116024China

A shortcut to the adiabatic process is an effective method for quantum information *** fast and robust quantum information transfer can be implemented by this *** energetic cost is an important measurement for the *** this paper,we investigate how to inhibit the energetic cost in stimulated Raman shortcut-to-adiabatic passage in a three-level *** energetic cost can be manipulated by adjusting detuning of the system and the energetic cost takes the minimum with one-photon resonance condition.

关键词： Quantum information shortcut-to adiabatic passage energetic cost

Regulation of Acyl-coenzyme A:Cholesterol Acyltransferase 2 Expression by Saturated Fatty Acids

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Chinese Medical Sciences Journal 2010年第4期25卷 222-227页

作者： Zhu-qin zhang Hou-zao Chen Rui-feng yang Ran zhang Yu-yan Jia yang Xi De-pei Liu Chih-chuan Liang National Laboratory of Medical Molecular Biology Institute of Basic Medical Science Chinese Academy of Medical Sciences ＆ Peking Union Medical College Beijing 100005 China

Objective To verify the regulation of acyl-coenzyme A:cholesterol acyltransferase 2 (ACAT 2), which is associated with cholesterol metabolism, by saturated fatty acids (SFAs). Methods Palmitic acid (PA), the most abundant saturated fatty acid in plasma, and oleic acid (OA), a widely distributed unsaturated fatty acid, were used to treat hepatic cells HepG2, HuH7, and mouse primary hepatocytes. In addition, PA at different concentrations and PA treatment at different durations were applied in HepG2 cells. In in vivo experiment, three-month male C57/BL6 mice were fed with control diet and SFA diet containing hydrogenated coconut oil rich of SFAs. The mRNA level of ACAT2 in those hepatic cells and the mouse livers was detected with real-time polymerase chain reaction (PCR). Results In the three types of hepatic cells treated with PA, that SFA induced significant increase of ACAT2 expression (P<0.01), whereas treatment with OA showed no significant effect. That effect of PA was noticed gradually rising along with the increase of PA concentration and the extension of PA treatment duration (both P<0.05). SFA diet feeding in mice resulted in a short-term and transient increase of ACAT2 expression in vivo, with a peak level appearing in the mice fed with SFA diet for two days (P<0.05). Conclusion SFA may regulate ACAT2 expression in human and mouse hepatic cells and in mouse livers.

关键词： acyl-coenzyme A:cholesterol acyltransferase 2 gene expression saturatedfatty acid

Stability and cytotoxicity of angiotensin-I-converting enzyme inhibitory peptides derived from bovine casein

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2014年第2期15卷 143-152页

作者： Wei WU Pan-pan YU feng-yang zhang Hong-xia CHE Zhan-mei JIANG Key Laboratory of Dairy Science Ministry of Education College of Food ScienceNortheast Agricultural University

This study investigated the effect of heat treatment combined with acid and alkali on the angiotensin-I- converting enzyme （ACE） inhibitory activity of peptides derived from bovine casein. The free amino group content, color, and cytotoxicity of the peptides were measured under different conditions. When heated at 100 ℃ in the pH range from 9.0 to 12.0, ACE inhibitory activity was reduced and the appearance of the peptides was significantly darkened. After thermal treatment in the presence of acid and alkali, the free amino group content of ACE inhibitory peptides decreased markedly. High temperature and prolonged heating also resulted in the loss of ACE inhibitory activity, the loss of free amino groups, and the darker coloration of bovine casein-derived peptides. However, ACE inhibitory peptides, within a concentration range of from 0.01 to 0.2 mg/ml, showed no cytotoxicity to Caco-2 and ECV-304 cell lines after heat treatment. This indicated that high temperature and alkaline heat treatment impaired the stability of bovine casein-derived ACE inhibitory peptides.

关键词： Angiotensin-l-converting enzyme inhibitory peptide Heat treatment Stability Cytotoxicity

A simple method for the detection of hepatitis A virus in the environmental samples by polymerase chain reaction

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Acta Oceanologica Sinica 1993年第2期12卷 279-284页

作者： yang feng, XuXun, zhang Yusheng, Chen Rongzhong and Zhou Xiulan Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

Hepatitis A virus (HAV) is very persistent in the environment and is especially difficult to detect in the seafoods. In recent years, molecular cloning of the genome of HAV has led to sensitive polymerase chain reaction (PCR) method for the detection of HAV RNA. Here we describe a new and simple procedure to extract RNA from contaminated clams and the PCR method for detection of HAV in environmental samples. The specificity and efficiency of PCR amplification were studied using cDNA and RNA of HAV. Three primer couples gave satisfactory results. Some basic parameters of the PCR were modified to perform a highly specific and sensitive test.

关键词： cloning RNA primer amplification contaminated satisfactory stranded visualize agarose RNase

Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 335-345页

作者： feng zhang Chenyang zhang Linlin Wu Wei Sun Hongliang zhang Jianhua Chen Yong Pei Songjiang Li Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesSchool of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China State Key Laboratory of Mineral Processing Beijing General Research Institute of Mining&MetallurgyBeijing 100160China Hunan Provincial Key Laboratory of Micro&Nano Materials Interfaces Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Department of Chemistry Xiangtan UniversityXiangtan 411105China China Railway Resource Group Co.Ltd Beijing 102300China

The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth ***,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)*** X-ray photoelectric spectroscopy(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption ***,the oxygen content in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and ***,sulfite ions were chelated with lead ions to form PbSO_(3)in *** hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than *** interaction between sulfite ions and lead ions could effectively inhibit the activation of *** addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of ***,sulfite ions hardly depressed the flotation of ga lena and could promote the flotation of galena to some *** study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关键词： sphalerite galena sulfite ion density functional theory depression mechanism

Reactive oxygen species in paraventricular nucleus involved in cardiac sympathetic afferent reflex in rats

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Journal of Nanjing Medical University 2005年第6期19卷 289-293页

作者： feng zhang yang Yu Ying zhang Yingchun Li Luqing zhang Lingling Fan Yingya Gao Guoqing Zhu Department of Physiology Nanjing Medical University Nanjing 210029 China.

Objective： The present study was designed to determine if reactive oxygen species （ROS） in the paraventricular nucleus （PVN） were involved in modulating cardiac sympathetic afferent reflex （CSAR） in anesthetized rats. Methods： Malondialdehyde （MDA）, the end product of lipid peroxidation, in the PVN, was determined by thiobarbituric acid （TBA） spectrometric method. Renal sympathetic nerve activity （RSNA） and arterial pressure were recorded in sinoaortic-denervated and cervical-vagotomized rats. The CSAR was evaluated by the response of the RSNA evoked by epicardial application of bradykinin （BK, 0.4 9g）. Results： The MDA in the PVN was significantly increased after epicardial application of BK compared with control （2.0 ±0.3 vs 0.8 ±0.1 nmol/mg protein, P 〈 0.01）. Microinjection of a superoxide anion scavenger, tiron （20 nmol） into the PVN significantly inhibited the CSAR evoked by BK （12.3±1.9 vs4.2± 1.2%, P 〈0.01） and decreased MDA level （1.9±0.3 vs 0.6 ±0.1 nmol/mg protein, P 〈0.01） compared with control. Conclusion： The ROS in the PVN is involved in modulating the CSAR in rats.

关键词： cardiac sympathetic afferent reflex paraventricular nucleus reactive oxygen species

Universal design of three-dimensional porous graphene-iron based promotors for kinetically rationalized lithium-sulfur chemistry

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Journal of Energy Chemistry 2025年第1期100卷 192-200页

作者： Hua Gao Yunfeng zhang Menglei Wang Ruoxuan yang Shuai feng Xuan Cao Yaping zhang Zhongyuan Lu Yingze Song State Key Laboratory of Environment-Friendly Energy Materials School of Materials and Chemistry Southwest University of Science and Technology School of Material Science and Engineering Henan University of Technology College of Chemistry and Chemical Engineering Taishan University

Lithium-sulfur （Li-S） batteries are widely deemed to be one of the most potential candidates for future secondary batteries because of their remarkable energy ***,notorious polysulfide shuttling and retarded sulfur reaction kinetics pose significant obstacles to the further application of Li-S *** rationally designed highly active electrocatalysts can facilitate polysulfide conversion,the universal and scalable synthesis strategies need to be ***,a universal synthetic strategy to construct a series of three-dimensional （3D） porous graphene-iron （3DGr-Fe） based electrocatalysts involving 3DGr-FeP,3DGr-Fe3C,and 3DGr-Fe3Se4is exploited for manipulating the Li-S redox *** has been observed that the implementation of a 3D porous Gr architecture leads to the well-designed conductive networks,while the uniformly dispersed iron nanoparticles introduce an abundance of active sites,fostering the lithium polysulfide conversion,thereby bolstering the overall electrochemical *** Li-S battery with the 3DGr-Fe based electrocatalyst exhibits remarkable capacity retention of 94.8%upon 100 times at 0.2 ***,the soft-packaged Li-S pouch cell based on such a 3DGr-Fe electrocatalyst delivers superior capacity of 1060.71 mA h g-1and guarantees for the continuous 30 min work of fan *** investigation gives comprehensive insights into the design,synthesis,and mechanism of 3DGr-Fe based electrocatalysts with high activity toward efficient and durable Li-S batteries.

关键词： Lithium-sulfur battery Universal synthesis 3D graphene-iron based promotor Electrocatalysis

Regulating the oxygen-atom configuration of carbon anode enabling extremely fast-charging potassium-ion hybrid capacitors

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Nano Research 2025年第1期18卷 373-381页

作者： Daping Qiu Yuehui Wang Lulu zhang Hang Lei Haizhou Ying Jin Niu Min Li Xuelin yang feng Wang Ru yang Hubei Provincial Collaborative Innovation Center for New Energy Microgrid College of Electrical Engineering and New EnergyChina Three Gorges UniversityYichang 443002China State Key Laboratory of Chemical Resource Engineering Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China College of Materials and Chemical Engineering China Three Gorges UniversityYichang 443002China

Metal-ion hybrid capacitors,such as potassium-ion hybrid capacitors(PIHCs),are regarded as promising fast-charging energy storage ***,the kinetics mismatch between the battery anode and the capacitive cathode restricts their fastcharging *** constructing carbon anodes with enhanced kinetics is an innovative approach to address this ***,using epigallocatechin gallate with high oxygen content as the precursor,oxygen-enriched carbon materials(OEC)with tunable C=O content are successfully ***,the C=O content of OEC is regulated by adjusting the pyrolysis *** as an anode for PIHCs,OEC-600 with the highest C=O content exhibits an attractive fast-charging specific capacity of 135.2 mAh·g^(-1)at 20 A·g^(-1),along with a superior fast-charging cycling *** theoretical calculations,comprehensive kinetics analysis and in-situ Raman,the positive effects of C=O on the potassium storage capability and reversibility of OEC-600 are ***,PIHCs assembled based on an OEC-600 anode deliver impressive energy/power density of 145.1 Wh·kg^(-1)/45.9 kW·kg^(-1)and superior fast-charging cycling stability with 87.5%of capacity retention over 20,000 cycles at 5 A·g^(-1).This work is anticipated to provide an optional design concept toward the carbon anode for fast-charging PIHCs.

关键词： carbon anode oxygen epigallocatechin gallate potassium-ion hybrid capacitor

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基于序列图像提高光斑质心定位精度

光学精密工程 2016年第11期24卷 2880-2888页

作者：钱锋杨名宇张晓沛中国科学院长春光学精密机械与物理研究所吉林长春130033 中国科学院大学北京100049 加利福尼亚大学洛杉矶分校亨利.萨缪里工程与应用科学学院美国加利福尼亚州洛杉矶市ca90095

针对激光模拟射击系统对激光光斑进行快速、高精度质心定位的要求,提出了一种基于视频序列图像的光斑检测与高精度质心定位方法。该方法首先利用帧间差分图像和噪声估计参数对射击突发事件进行检测;然后利用噪声估计方法确定光斑的分割... 详细信息

针对激光模拟射击系统对激光光斑进行快速、高精度质心定位的要求,提出了一种基于视频序列图像的光斑检测与高精度质心定位方法。该方法首先利用帧间差分图像和噪声估计参数对射击突发事件进行检测;然后利用噪声估计方法确定光斑的分割阈值,结合形态学滤波对目标光斑和背景噪声进行有效分割,提取光斑区域,同时降低窗口内外噪声。最后,用4帧差分图像合成1帧高分辨率的图像来抑制图像噪声和计算误差的影响,实现光斑质心的高精度定位。实验结果表明,本文方法的光斑质心定位精度与稳定性均优于传统的方法;其中光斑质心定位精度达到了亚像素级别,稳定性度量平均值为0.000 49,优于传统方法的0.002 97。得到的结果显示,提出的方法有助于提升激光射击系统的性能。

关键词：光斑检测质心定位灰度重心法序列图像激光模拟射击