检索结果-南通市图书馆

DIRAC-BERGMANN FORMALISM OF THE FERMI-BOSE TRANSMUTATION IN (2+1)-DIMENSIONS

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1990年第10期7卷 433-436页

作者： chen Yixin NI Guangjiong Department of Physics Fudan UniversityShanghai 200433 Institute of mathematics Nankai UniversityTianjin 300071

The model of charged particles coupled to the pure Chern-Simons gauge field in(2+1)-dimensions is canonically quantized by Dirac-Bergmann *** is demonstrated that the Chern-Simons term in Abelian gauge theory turns bo... 详细信息

关键词： gauge dimensions turns

Tunable quantum dots in monolithic Fabry-Perot microcavities for high-performance single-photon sources

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第2期13卷 325-332页

作者： Jiawei Yang Yan chen Zhixuan Rao Ziyang Zheng Changkun Song Yujie chen Kaili Xiong Pingxing chen Chaofan Zhang Wei Wu Ying Yu Siyuan Yu State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006China Institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Quantum Information Mechanism and Technology National University of Defense TechnologyChangsha 410073 HunanChina Hefei National Laboratory Hefei 230088China

Cavity-enhanced single quantum dots(QDs)are the main approach towards ultra-high-performance solid-state quantum light sources for scalable photonic quantum ***,harnessing the Purcell effect requires precise spectral and spatial alignment of the QDs’emission with the cavity mode,which is challenging for most *** we have successfully integrated miniaturized Fabry-Perot microcavities with a piezoelectric actuator,and demonstrated a bright single-photon source derived from a deterministically coupled QD within this *** the cavity-membrane structures,we have achieved large spectral tunability via strain *** resonance,a high Purcell factor of~9 is *** source delivers single photons with simultaneous high extraction efficiency of 0.58,high purity of 0.956(2)and high indistinguishability of 0.922(4).Together with its compact footprint,our scheme facilitates the scalable integration of indistinguishable quantum light sources on-chip,therefore removing a major barrier to the development of solid-state quantum information platforms based on QDs.

关键词： quantum removing purity

Synthesis and luminescence properties of red-emitting M_2Si_5N_8:Eu^(2+)-based(M=Ca,Sr,Ba) phosphors by a simple nitrate reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2014年第3期57卷 433-436页

作者： chen Changcheng XIE ErQing School of Materials Science and Engineering Georgia Institute of Technology School of Physical Science and Technology Lanzhou University

M2SisN8：Eu2＋-based （M=Ca, Sr, Ba） red-emitting phosphors are fabricated at relatively low temperature （1200℃） and atmos- pheric pressure using a simple solid-state reaction process. Several processing parameters are systematically investigated to optimize the phosphors structural characterization and photoluminescence performance, including the amount of europium and the properties of the precursor materials. The as-prepared M2SisNs：Eu2＋-based （M=Ca, Sr, Ba） phosphors are orange in color and are intensively emitted in the red region of 580-670 nm under 465 nm excitation.

关键词： M2SisN8:Eu2+-based phosphors nitrate reduction luminescence

Dietary therapy may be sufficient for type 1 diabetes treatment

在线全文

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2018年第2期15卷 85-87页

作者： Shuoyang Liu Xin chen State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao999078China

There is compelling evidence that the gastrointestinal commensal microbiota is instrumental in shaping the functions of the immune system.1 The short-chain fatty acids(SCFAs),mainly acetate,propionate and butyrate,which are the end products of dietary fibers after bacterial metabolism,act as an interface between the microbiota and immune cells.2 In a recent article in Nature Immunology,Mariño et al.3 reported that the levels of acetate and butyrate in the blood and feces of non-obese diabetic(NOD)mice,a mouse model of human type 1 diabetes(T1D),are inversely correlated with the *** NOD mice were completely protected from the development of diabetes by the administration of a combination of the acetate-and butyrate-yielding *** SCFAs inhibited pathogenic effector T cells and induced CD4+Foxp3+regulatory T cells(Tregs),thereby contributing to the unprecedented therapeutic effect.3 The findings of this study may open a new avenue to prevent and treat patients with T1D with medicinal food or nutraceuticals rather than conventional pharmaceutics.

关键词： metabolism inhibited treatment

Two New Glycosides from Rubus amabilis

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 2000年第10期11卷 897-900页

作者： chen, XC Jia, ZJ Lanzhou Univ Natl Lab Appl Organ Chem Dept Chem Lanzhou 730000 Peoples R China

A pregnane glycoside and a lignan glycoside were isolated from the aerial parts of Rubus amabilis. Their structures were elucidated as 3-O-beta-D-glucopyranosyl-3 beta.15 alpha-dihydroxypregn-5-en-20-one and (-)-secoi... 详细信息

关键词： Rubus amabilis Rosaceae pregnane lignan glycoside

DESCRIPTION AND PREDICTION OF CATASTROPHE OF VIBRATION STATE FOR FAULTY ROTORS

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 1996年第1期6卷 130-134页

作者： chen Anhua Zhong Jue Department of Mechanical Engineering Central South University of Technology Changsha 410083

A sudden increase of vibration amplitude with no foreboding often results in an abrupt breakdown of a mechanical *** catastrophe of vibration state of a faulty rotor is a typical nonlinear phenomenon,and very difficult to be described and predicted with linear vibration *** the basis of nonlinear vibration and catastrophe theory,fhe eatastrophe of the vibration amplitude of the faulty rotor is described;a way to predict its emergence is developed.

关键词： mechanical fault diagnosis and prediction cusp catastrophe model nonlinear vibration rotor

Toxicity mechanisms of photodegraded polyvinyl chloride nanoplastics on pea seedlings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2024年第4期18卷 111-124页

作者： Hao Wu Beibei He Bocheng chen An Liu College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

Nanoplasctics(NPs),which are very small in particle size,exert toxic effect to ***,compared to original NPs,photodegraded NPs would pose higher *** is because their relatively higher specific surface areas and the presence of additives which can more easily *** original NPs and aged NPs affect plant growth has not been widely *** work chose polyvinyl chloride NPs(PVC-NPs)that were subjected to up to 1000 h UV light radiation to explore the impact of PVC-NPs on the growth of pea seedlings(Pisum Sativum L.).The results indicated the existence of PVC-NPs with longer UV light radiation time and higher concentrations had more negative influences on pea seedlings’growth such as germination rate(decreased by 10.6%–22.5%),stem length(decreased by 2.8%–8.1%),dry weight(decreased by 6.3%–7.1%)and fresh weight(decreased by 6.7%–14.8%).It was also noted that photodegraded PVC-NPs resulted in damage to leaf stomata and roots,hindering photosynthesis and absorption of nutrients and hence the decrease in chlorophyll and soluble sugar *** to transcriptomic investigation results,the presence of aged PVC-NPs primarily influenced protein processing in endoplasmic reticulum(upregulated metabolic pathway)and phenylpropanoid biosynthesis(downregulated metabolic pathway)of pea *** results provide an in-depth understanding of how NPs influence the growth of plants.

关键词： Nanoplasctics Polyvinyl chloride Toxicity mechanisms Plant growth

Density limit disruption prediction using a long short-term memory network on EAST

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2020年第11期22卷 143-150页

作者： Kai ZHANG Dalong chen Bihao GUO Junjie chen Bingjia XIAO Department of Engineering and Applied Physics School of Physical SciencesUniversity of Science and Technology of China.Hefei 230026People's Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China

Disruption prediction using a long short-term memory(LSTM)algorithm has been developed on EAST,due to its inherent advantages in time series data *** the present work,LSTM is used as the model and the AUC(area under receiver operation characteristic curve)is used as the evaluation *** the model is trained on data from the plasma current flattop phase and tested on data from the same period multiple times,the highest AUC is 0.8646 and the training time is about 6900 s per *** comparison,the last 1000 ms of the flattop phases are intercepted as short time *** the model is trained on data from short time sequences and tested on data from the same period,the highest AUC is increased to 0.9379 and the training time is restricted to 36 s per *** the best model trained on the short time sequences is applied to the flattop phase for testing,the AUC is up to *** experiment results show that it is possible for LSTM to train the model on data from short time sequences and migrate the model to the entire flattop phase,with a shorter training time and higher AUC value.

关键词： disruption prediction tokamak neural networks flattop phase

The expression and clinical significance of CD44v in human gastric cancers

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2000年第1期6卷 125-127页

作者： chen GY Wang DR Department of General Surgery The First Affiliated Hospital of Nanjing Medical UniversityNanjing 210029China

INTRODUCTIONCD44 was originally implicated as a'homing'receptor directing the migration of ***44 expression has beenconfirmed not only in lymphocytes but also in awide variety of epithelial *** is considered asan impo... 详细信息

关键词： Subject headings CD44v gene stomach neoplasms neoplasm metastasis gene expression