检索结果-南通市图书馆

Based on non-targeted metabolomics for differential components screening of Rosae Chinensis Flos and Rosae Rugosae Flos and their quality evaluation

在线全文

学校读者我要写书评

暂无评论

Traditional Medicine Research 2025年第2期10卷 1-15页

作者： Xu liang Ni-Hui Zhang zhi-Lai Zhan Guang-Lu Chang Yan Gao Xia li Wen-Yuan Gao School of Pharmaceutical Science and Technology Faculty of MedicineTianjin UniversityTianjin 300193China State Key Laboratory for Quality Ensurance and Sustainable Use of dao-di Herbs China Academy of Chinese Medical SciencesBeijing 100700China Key Laboratory of Modern Chinese Medicine Resources Research Enterprises Tianjin 300402China

Background:Rosa chinensis *** Rosa rugosa *** not only of ornamental value,but also edible flowers and the flower buds have been listed in the Chinese Pharmacopoeia as traditional *** two plants have some differences in efficacy,but the flower buds are easily confused for similar *** addition,large-scale cultivation of ornamental rose flowers may lead to a decrease in the effective components of medicinal ***,it is necessary to study the chemical composition and make quality evaluation of Rosae Chinensis Flos(Yueji)and Rosae Rugosae Flos(Meigui).Methods:In this study,40 batches of samples including Meigui and Yueji from different regions in China were collected to establish high-performance liquid chromatography ***,the fingerprints data was analyzed using principal component analysis,hierarchical cluster analysis,and partial least squares discriminant analysis analysis chemometrics to obtain information on intergroup differences,and non-targeted metabolomic techniques were applied to identify and compare chemical compositions of samples which were chosen from groups with large *** compounds were screened by orthogonal partial least-squares discriminant analysis and S-plot,and finally multi-component quantification was performed to comprehensively evaluate the quality of Yueji and ***:The similarity between the fingerprints of 40 batches roses and the reference print R was 0.73 to 0.93,indicating that there were similarities and differences between the *** principal component analysis and hierarchical cluster analysis of fingerprints data,the samples from different origins and varieties were intuitively divided into four *** least-squares discriminant analysis analysis showed that Meigui and Yueji cluster into two categories and the model was reliable.A total of 89 compounds were identified by high resolution mass spectrometry,mainly were flavonoids and flavon

关键词： Rosa chinensis Jacq. Rosa rugosa Thunb. metabolomics chemometrics multiple component quantification quality evaluation

Increase in the variability of terrestrial carbon uptake in response to enhanced future ENSO modulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 32-38页

作者： Younong li li dan Jing Peng Qidong Yang Fuqiang Yang Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Key Laboratory of Atmospheric Environment and Processes in the Boundary Layer over the Low-Latitude Plateau Region Department of Atmospheric ScienceYunnan UniversityKunmingChina

El Niño-Southern Oscillation(ENSO)is a major driver of climate change in middle and low latitudes and thus strongly influences the terrestrial carbon cycle through land-air *** the ENSO modulation and carbon flux variability are projected to increase in the future,but their connection still needs further *** investigate the impact of future ENSO modulation on carbon flux variability,this study used 10 CMIP6 earth system models to analyze ENSO modulation and carbon flux variability in middle and low latitudes,and their relationship,under different scenarios simulated by CMIP6 *** results show a high consistency in the simulations,with both ENSO modulation and carbon flux variability showing an increasing trend in the *** higher the emissions scenario,especially SSP5-8.5 compared to SSP2-4.5,the greater the increase in *** flux variability in the middle and low latitudes under SSP2-4.5 increases by 30.9%compared to historical levels during 1951-2000,while under SSP5-8.5 it increases by 58.2%.Further analysis suggests that ENSO influences mid-and low-latitude carbon flux variability primarily through *** occurrence may potentially be attributed to the increased responsiveness of gross primary productivity towards regional temperature fluctuations,combined with the intensified influence of ENSO on land surface temperatures.

关键词： Carbon variability ENSO modulation CMIP6 models

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

金属烤瓷修复体602例临床分析

泰州职业技术学院学报 2003年第2期3卷 31-33页

作者：张志勇俞大力张珍泰州职业技术学院医学系江苏泰州225300

目的　通过对金属烤瓷修复体的追踪检查 ,总结修复成功的关键要素。方法　常规牙体制备、取印模、灌模、制作暂时冠、比色、试戴、调牙合、粘固等系列步骤 ,对 60 2例 1 5 1 2个牙进行金属烤瓷冠修复。结果　通过 5个月至 5年 5个月... 详细信息

目的　通过对金属烤瓷修复体的追踪检查 ,总结修复成功的关键要素。方法　常规牙体制备、取印模、灌模、制作暂时冠、比色、试戴、调牙合、粘固等系列步骤 ,对 60 2例 1 5 1 2个牙进行金属烤瓷冠修复。结果　通过 5个月至 5年 5个月的追踪检查 ,发现　其中32个修复体有瓷裂纹或瓷折裂现象 ( 2 1 %) ,1 8个修复体边缘不太密合 ( 1 1 9%) ,8个修复体龈缘金属显露 ( 0 5 %) ,1 2个修复体发生龈缘炎或龈萎缩 ( 0 75 %) ,4个修复体发生牙髓炎 ( 0 2 5 %) ,1 0个修复体有食物嵌塞 ,2 4个修复体色调、彩度、明度出现偏差。均未见牙颈部继发龋 ,松动脱落现象。结论　选择适合的基牙 ,采用正确的备牙方式 ,合理的颈缘肩台设计 ,准确的邻接关系 ,细致的比色与调牙合 ,及时制作暂时冠。

关键词：金属烤瓷修复体肩台牙体预备

在线全文

学校读者我要写书评

暂无评论

双针-板结构脉冲气泡放电等离子体固氮研究

原子与分子物理学报 2025年第6期42卷 122-128页

作者：赵少伟张丽方志南京工业大学电气工程与控制科学学院南京211816

大气压低温等离子体可以利用空气直接进行氧化固氮,具有反应条件温和、参数灵活可控、避免温室气体排放等优点.本文利用双针-板电极在水中形成气泡放电等离子体,以空气为放电气体进行了固氮研究,分析了产物浓度和固氮能耗的影响因素.研... 详细信息

大气压低温等离子体可以利用空气直接进行氧化固氮,具有反应条件温和、参数灵活可控、避免温室气体排放等优点.本文利用双针-板电极在水中形成气泡放电等离子体,以空气为放电气体进行了固氮研究,分析了产物浓度和固氮能耗的影响因素.研究结果表明,等离子体中含有丰富的氮原子、氧原子、氢原子、激发态氮分子等活性物种,可高效合成硝态含氮产物.研究发现,脉冲参数、电极间隙、工作气体组分对气泡放电等离子体的固氮性能有重要影响.装置最高NO~-_x合成速率为19.2μmol/min,最小能耗约为11 MJ/mol.此外还发现,电极间隙为6 mm时,固氮性能最优;空气中增加适量氧气(氧气/氮气比例为0.4)可以增强产物合成,降低能耗.

关键词：低温等离子体纳秒脉冲放电气液放电固氮

Primary parenchymal squamous cell carcinoma of the kidney:A case report

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第4期13卷 34-40页

作者： zhi-Hui Zheng Bo Shao Chao-Min Xu Ke Wang Jia-Zhu Wen li-Kang Luo Jia-Cheng Guan Department of Ultrasound The Second People’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina Department of Radiology Shulan(Quzhou)HospitalQuzhou 324000Zhejiang ProvinceChina Department of Radiology The Second People’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina Department of Pathology The Second people’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina

BACKGROUND Primary squamous cell carcinoma(SCC)of the renal parenchyma is extremely rare,with only nine cases *** SUMMARY This study reports a 51-year-old man with primary SCC of the renal *** patient was admitted with recurrent dull pain and discomfort in the right lumbar region,which had worsened over 2 weeks,accompanied by painful gross *** antigen(SCCA)levels were elevated,and imaging revealed a renal mass with associated *** patient underwent laparoscopic unilateral nephrectomy and lymph node *** pathology confirmed highly differentiated SCC with necrosis in the right renal parenchyma,with negative renal pelvis and *** pathological stage was *** months after surgery,the tumor recurred with involvement of the liver,right psoas major muscle,and inferior vena *** patient refused chemotherapy and succumbed to the disease 6 months postoperatively due to disease *** We report a case of primary SCC of the renal parenchyma,a rare renal *** clinical symptoms,laboratory tests,and imaging findings are nonspecific,making accurate and timely diagnosis *** to the literature,for patients with renal calculi accompanied by a renal mass,elevated serum SCCA levels,and magnetic resonance imaging showing cystic or cystic-solid masses within the kidney with pseudocapsules and heterogeneous mild enhancement,the possibility of this disease should be considered.

关键词： Renal tumor Renal parenchyma Squamous cell carcinoma Renal calculi Computed tomography Case report

Sub-additive Unstable Topological Pressure of Diffeomorphisms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2022年第12期38卷 2285-2298页

作者： Wen da ZHANG zhi Qiang li Yun Hua ZHOU College of Mathematics and Statistics Chongqing Jiaotong UniversityChongqing 400074P.R.China College of Mathematics and Statistics Chongqing UniversityChongqing 401331P.R.China

In this paper,we study unstable topological pressure for C^(1)-smooth partially hyperbolic diffeomorphisms with sub-additive ***,without any additional assumption,we have established the expected variational principle which connects this unstable topological pressure and the unstable measure theoretic entropy,as well as the corresponding Lyapunov exponent.

关键词： Partially hyperbolic systems unstable topological pressure sub-additive potentials

Tuning single-phase medium-entropy oxides derived from nanoporous NiCuCoMn alloy as a highly stable anode for li-ion batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第9期42卷 2982-2992页

作者： Zhen-Yang Yu Qi Sun Hao li zhi-Jun Qiao Wei-Jie li Shu-Lei Chou zhi-Jia Zhang Yong Jiang School of Mechanical Engineering Tiangong UniversityTianjin300387China State Key Laboratory for Powder Metallurgy Central South UniversityChangsha410083China School of Material Science and Engineering Tiangong UniversityTianjin300387China School of Electronic and Information Engineering Institute of Quantum Materials and DevicesTiangong UniversityTianjin300387China

Incorporating four cations into a single-phase oxide is beneficial for maintaining structural stability during li+insertion/desertion because of the produced entropy-dominated phase stabilization effects. However,medium-entropy oxides exhibit inherently poor electron and ion conductivity. As such, in this work, a single-phase medium-entropy oxide of Ni_(x)Cu_(y)CozMn_(1-x-y-z)O(named as NCCM@oxides(H_(2))) is prepared by modified-NiCuCoMn alloy through the epitaxial-growing-based self-combustion and hydrogen reduction. During hydrogen reduction, some Cu ions are reduced to elemental Cu(defined as Cu^(0)),which is distributed among the metal oxides, while generating extensive oxygen vacancies around Cu. The synergetic effect between nanoporous metal-core oxide-shell structure and enriched oxygen/Cu^(0) vacancies greatly enhances the electronic/ionic conductivity. In addition, the lattice of single-phase quaternary metal oxides has the configuration entropy stability, which enables the rock-salt structure to remain stable during repeated conversion reactions. Benefiting from the above-mentioned merits, the anodeforli-ionbatterieswithentropy-stabled NCCM@oxides(H_(2)) composite shows a high specific capacity of 699 mAh·g^(-1) at 0.1 A·g^(-1) and ultra-stable cycling stability, which maintains 618 and 489 mAh·g^(-1) at 0.1 and 1.0 A·g^(-1) after 200 cycles, respectively. This is the first use of this novel and simple strategy for modifying medium-entropy oxides, which paves the way for the development of high-entropy oxides as high-performance electrodes.

关键词： NiCuCoMn alloy Medium-entropy oxides li-ion batteries Ultrahigh stability Mechanism

Quantum Dynamics of li+HF/DF Reaction Investigated by a State-to-State Time-dependent Wave Packet Approach

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2015年第4期28卷 -页

作者： Wen-tao li Mao-du Chen zhi-gang Sun School of Physics and Optoelectronic Technology Dalian University of Technology Dalian 116024ChinaState Key Laboratory of Molecular Reaction Dynamics and Center for Theoretical Computational Chemistry Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China School of Physics and Optoelectronic Technology Dalian University of Technology Dalian 116024China State Key Laboratory of Molecular Reaction Dynamics and Center for Theoretical Computational Chemistry Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Using the reactant coordinate based time-dependent wave packet method, on the APW potential energy surface, the differential and integral cross sections of the li+DF/HF(v=0, j=0, 1) reactions were calculated over the collision energy range from the threshold to 0.25 eV. The initial state-specified reaction rate constants of the title reaction were also calculated. The results indicate that, compared with the li+DF reaction, the product liF of li+HF reaction is a little more rotationally excited but essentially similar. The initial rotational excitation from j=0 to 1 has little effect on the li+DF reaction. However, the rotational excitation of DF does result in a little more rotationally excited product liF. The different cross section of both reactions is forward biased in the studied collision energy range, especially at relatively high collision energy. The resonances in the li+HF reaction may be identifiable as the oscillations in the product ro-vibrational state-resolved integral cross sections and backward scattering as a function of collusion energy. For the li+HF reaction, the rate constant is not sensitive to the temperature and almost has no change in the temperature range considered. For the li+DF reaction, the rate constant increase by a factor of about 10 in the temperature range of 100–300 K. Brief comparison for the total reaction probabilities and integral cross section of the li+HF reaction has been carried out between ours and the values reported previously. The agreement is good, and the difference should come from the better convergence of our present calculations.

关键词： Quantum wavepacket Integral and differential cross section Reaction rate constant li+HF/DF Isotope effect

Peduncin, A New Indole Alkaloid from Pueraria peduncualris

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2001年第10期12卷 899-902页

作者： Na li Qi Tai ZHENG zhi da MIN Department of Natural Products Chemistry China Pharmaceutical UniversityNanjing 210009 Institute of Materia Medica Chinese Academy of Medical Sciences&Peking Union Medical College1 Xian Nong Tan streetBeijing 100050

A new indole alkaloid, peduncin was isolated from the roots of Pueraria peduncularis. Its structure was established as 1 by NMR spectroscopic and X-ray crystallographic analysis.

关键词： Pueraria peduncularis Leguminosae alkaloid peduncin