检索结果-南通市图书馆

Demonstration of quantum anti-Zeno effect with a single trapped ion

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第9期27卷 191-196页

作者： Man-chao Zhang Wei Wu Lin-Ze He Yi Xie Chun-Wang Wu quan Li Ping-Xing chen Department of Physics College of Liberal Arts and SciencesNational University of Defense TechnologyChangsha 410073China State Key Laboratory of High Pertbrmance Computing National University of Defense TechnologyChangsha 410073China

We experimentally demonstrate the quantum anti-Zeno effect in a two-level system based on a single trapped ion ^（40）Ca~＋. In the large detuning regime, we show that the transfer from the ground state to the excited state can be remarkably enhanced by the inserted projection measurements. The inserted measurements in our experiment are realized by the electron shelving technique. Compared to the ideal projection measurement, which makes the quantum state collapse instantaneously, a practical electron shelving process needs a finite time duration. The minimum time for this collapse process is shown to be inversely proportional to the square of the coupling strength between the measurement laser and the system.

关键词： quantum anti-Zeno effect single trapped ion quantum measurement

Manipulating the Flipping of Water Dipoles in Carbon Nanotubes

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2019年第10期36卷 17-21页

作者： Dang-Xin Mao Xiao-Gang Wang Guo-quan Zhou Song-Wei Zeng Liang chen Jun-Lang chen chao-Qing Dai Department of Optical Engineering Zhejiang A&F UniversityHangzhou 311300 School of Information and Industry Zhejiang A&F UniversityHangzhou 311300

Flipping of water dipoles in carbon nanotubes is of great importance in many physical and biological applications,such as signal amplification,molecular switches and *** of these applications,understanding and inhibiting the non-negligible thermal noise is ***,we use molecular dynamics simulations to show that the flipping frequency of water dipoles increases with the rising temperature,and the thermal noise can be suppressed by imposed charges and external uniform electric ***,the water dipoles flip periodically between two equiprobable and stable states under alternating electric *** two stable states may be adopted to store 0 and 1 bits for memory storage or molecular computing.

关键词： noise negligible Carbon

A triple-enhanced chemodynamic approach based on glucosepowered hybrid nanoreactors for effective bacteria killing

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第2期16卷 2682-2694页

作者： Jintao Fu Yixian Zhou Ting Liu Wenhao Wang Yiting Zhao Ying Sun Yiming Zhang Wenxuan Qin Zhongwei chen chao Lu Guilan quan Chuanbin Wu Xin Pan School of Pharmaceutical Sciences Sun Yat-sen UniversityGuangzhou 510006China College of Pharmacy Jinan UniversityGuangzhou 511443China

Rapid evolution of multidrug resistance in bacterial pathogens is outpacing the development of new antibiotics,and chemodynamic therapy(CDT)provides an excellent ***,achieving highly efficient CDT is still a great challenge,since the pH in the infection site is close to neutral and the supply of H_(2)O_(2)is *** herein constructed the antibacterial *** green(ICG)and glucose oxidase(GOx)were incorporated into homologous zeolitic imidazolate framework-8(ZIF-8)nanoparticles coating with metal polyphenol network(MPN)composed by Fe^(3+)and tannic acid(TA).The well-designed nanoreactors could simultaneously break the pH and H_(2)O_(2)limitations,and generate hyperthermia under irradiation,thus realizing a triple-enhanced CDT for high-efficiency ***,the nanoreactors could combine CDT with photothermal therapy(PTT)and photodynamic therapy(PDT),which not only improved the bactericidal efficiency and broadened the antibacterial spectrum,but also alleviated the antibiotics resistance ***,the proposed nanoreactors achieved a robust in vitro bacterial killing against Gram-positive methicillin-resistant Staphylococcus aureus(MRSA)and Gram-negative Pseudomonas *** nanoreactors achieved an 99.7%MRSA reduction in an MRSA-induced murine abscess model accompanied with negligible ***,this study provides a promising strategy for multiple-enhanced CDT and multimodal combined therapy for pathogenic infections.

关键词： metal-organic frameworks glucose oxidase photothermal therapy photodynamic therapy localized bacterial infection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

不同土地利用方式对土壤惰性碳的影响

草原与草坪 2024年第2期44卷 96-105页

作者：左超罗彩云赵亮赵新全常小峰潘思辰中国科学院西北高原生物研究所青海西宁810008 中国科学院三江源国家公园研究院青海西宁810008 中国科学院大学北京100049 西北农林科技大学水土保持研究所陕西杨凌712100

【目的】研究不同土地利用方式对草地土壤惰性碳的影响,对于客观认识草地在减少大气CO_(2)排放中的作用,制定草地碳增汇策略,合理利用草地资源具有重要意义。【方法】在中国科学院海北高寒草甸生态系统研究站3种不同利用方式土地(冬季... 详细信息

【目的】研究不同土地利用方式对草地土壤惰性碳的影响,对于客观认识草地在减少大气CO_(2)排放中的作用,制定草地碳增汇策略,合理利用草地资源具有重要意义。【方法】在中国科学院海北高寒草甸生态系统研究站3种不同利用方式土地(冬季自由放牧—冬牧、围封禁牧—禁牧、开垦播种燕麦—燕麦),采用梅花形5点采样法采集野外样品,结合室内酸水解等分析方法,对0~30 cm土层的土壤总有机碳和惰性碳进行分层研究。【结果】1)0~10 cm土层土壤有机碳含量以冬牧最高(95.15 g/kg),禁牧次之(70.56 g/kg),开垦播种燕麦最小(54.44 g/kg)。冬牧土壤惰性碳含量比禁牧高27.77%,冬牧比燕麦高32.54%。2)与冬牧相比,禁牧16年土壤0~10 cm土层有机碳下降了25.84%,开垦30年0~10 cm土层土壤有机碳下降了42.79%。禁牧16年土壤0~30 cm土层有机碳下降了10.89%,开垦30年0~30 cm土层土壤有机碳下降了9.48%。0~30 cm土层惰性碳平均含量冬牧比禁牧高22.67%,冬牧比燕麦高3.60%;与开垦相比,禁牧使惰性碳降低了19.78%。3)不同土地利用方式土壤理化性质与土壤碳库组成存在显著相关,土壤理化性质的改变是引起不同草地类型土壤碳库组成变化的重要原因。【结论】禁牧后土壤惰性碳含量降低的幅度大于开垦,冬牧有利于土壤惰性碳的积累;健康草地禁牧之后降低了土壤惰性碳的含量,减弱了土壤有机碳的稳定性。不同土地利用方式主要通过影响土壤理化性质及养分含量影响土壤有机碳和惰性碳含量。因此,通过改善放牧管理,可以维持或进一步增加有机碳存储以及土壤有机碳的稳定性,健康草地禁牧不利于土壤有机碳的积累。

关键词：高寒草甸不同土地利用方式土壤有机碳惰性碳

Subsoiling and Ridge Tillage Alleviate the High Temperature Stress in Spring Maize in the North China Plain

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第12期12卷 2179-2188页

作者： TAO Zhi-qiang SUI Peng chen Yuan-quan LI chao NIE Zi-jin YUAN Shu-fen SHI Jiang-tao GAO Wang-sheng College of Agronomy and Biotechnology China Agricultural University Wuqiao Experimental Station China Agricultural University

High temperature stress（HTS） on spring maize（Zea mays L.） during the filling stage is the key factor that limits the yield increase in the North China Plain（NCP）.Subsoiling（SS） and ridge tillage（R） were introduced to enhance the ability of spring maize to resist HTS during the filling *** field experiments were conducted during the 2011 and 2012 maize growing seasons at Wuqiao County,Hebei Province,*** with rotary tillage（RT）,the net photosynthetic rate,stomatal conductance,transpiration rate,and chlorophyll relative content（SPAD） of maize leaves was increased by 40.0,42.6,12.8,and 29.7% under SS,and increased by 20.4,20.0,5.4,and 14.2% under R,***,the treatments reduce the intercellular CO 2 concentration under *** SS and R treatments increased the relative water content（RWC） by 11.9 and 6.2%,and the water use efficiency（WUE） by 24.3 and 14.3%,respectively,compared with *** SS treatment increased the root length density and soil moisture in the 0-80 cm soil profile,whereas the R treatment increased the root length density and soil moisture in the 0-40 cm soil profile compared with the RT *** with 2011,the number of days with temperatures 33°C was more 2 d and the mean day temperature was higher 0.9°C than that in 2012,whereas the plant yield decreased by 2.5,8.5 and 10.9%,the net photosynthetic rate reduced by 7.5,10.5 and 18.0%,the RWC reduced by 3.9,5.6 and 6.2%,and the WUE at leaf level reduced by 1.8,5.2 and 13.1% in the SS,R and RT treatments,*** the root length density and the soil moisture also decreased at different *** yield,photosynthetic rate,plant water status,root length density,and soil moisture under the SS and R treatments declined less than that under the RT *** results indicated that SS and R can enhance the HTS resistance of spring maize during the filling stage,and led to higher yield by directly improving soil moisture and root growth and indirectly improving

关键词： high temperature stress spring maize filling stage subsoiling ridge tillage

Porcine Interleukin-2 Expression in Insect Cells and Its Enhancement of Pig Immunity to Swine Influenza Virus Inactivated Vaccine

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2010年第8期9卷 1211-1220页

作者： chen Hong-ying ZHANG Hong-ying HUANG Yan-quan CUI Bao-an WANG Zhen-ya WANG Yan-bin LIU Jin-peng chao An-jun College of Animal Husbandry and Veterinary Henan Agricultural University Zhengzhou 450002 P.R.China

Mature porcine interleukin-2 （pIL-2） gene was amplified by PCR from the plasmid pGEM-T-pIL2 and cloned into the baculovirus pFastBacTM Dual vector of the Bac-to-Bac baculovirus expression system under the control of the PH promoter. Recombinant plL-2 （rpIL-2） expressed in Sf9 insect cells was detected by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunofluorescence assay. Western blot analysis confirmed that the rpIL-2 protein had a molecular mass of 20 kDa, which was larger than the molecular mass of the mature protein predicted based on its peptide sequence. The rpIL-2 protein induced in vitro proliferation of ConA-stimulated porcine splenocytes and enhanced in vivo protective immune responses induced by vaccinating the pigs with inactivated oil emulsion vaccine against swine influenza virus. The results showed that the rpIL-2 expressed in Sf9 insect cells has immunoenhancement effects; the finding lays the foundation for the preparation of a specific recombinant IL-2 protein and the development of a novel immune adjuvant of vaccines against various infectious porcine pathogens to increase the immunoprotective efficacy of vaccines.

关键词： porcine interleukin-2 Sf9 insect cells expression inactivated vaccine swine influenza virus

A robust adaptive control with unmodeled dynamic for HVDC transmission systems

在线全文

学校读者我要写书评

暂无评论

Frontiers of Electrical and Electronic Engineering in China 2006年第4期1卷 371-374页

作者： YAN quan LI Xing-yuan WANG Lu LIU Hong-chao chen Shu-heng School of Electrical Engineering and Information Sichuan UniversityChengdu 610065China

Utilizing the feature of quick response of HVDC to improve the performance of AC/DC system has become the emphasis to be *** paper intro-duces firstly the principle of the robust adaptive control of nonlinear systems with unmodeled dynamics,then devel-oped the robust adaptive additional control of HVDC with unmodeled dynamics of generator in order to improve sta-bility of power *** additional control of HVDC with unmodeled dynamics only uses the local signals and its design is simple,furthermore it can obviously improve the stability of power system in different operational *** results using the presented concepts obtained on single machine infinite bus model are also *** results prove the efficiency of the control *** design process of controller provided a new idea to design controller by use of simplified model.

关键词： HVDC unmodeled dynamics robust adaptive control the stability of power system

Panretinal photocoagulation versus panretinal photocoagulation plus intravitreal bevacizumab for high-risk proliferative diabetic retinopathy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2016年第12期9卷 1772-1778页

作者： Ai-Yi Zhou chen-Jing Zhou Jing Yao Yan-Long quan Bai-chao Ren Jian-Ming Wang Department of Ophthalmology the Second Affiliated Hospital of Medical College of Xi'an Jiaotong University

AIM： To evaluate the effects of panretinal photocoagulation （PRP） compared with PRP plus intravitreal bevacizumab （IVB） in patients with high-risk proliferative diabetic retinopathy （PDR） according to the Early Treatment Diabetic Retinopathy Study ***： The data were collected retrospectively from the eyes of high-risk PDR patients, which were divided into two groups. After treated with standard PRP, the eyes were randomly assigned to receive only PRP （PRP group） or PRP plus intravitreal injection of 1.25 mg of bevacizumab （PRP-Plus group）. Patients underwent complete ophthalmic evaluation, including best corrected visual acuity （BCVA）, intraocular pressure （IOP）, and new vessel size in fluorescein angiography （FA） and optical coherence tomography for the assessment of central subfield macular thickness （CSMT） at baseline and at weeks 12 （±2）, 16 （±2）, 24 （±2） and 48 （±2）. Main outcome measures also included vitreous clear-up time and neovascularization on the disc （NVD） regression time. Adverse events associated with intravitreal injection were ***： Thirty consecutive patients （n=36 eyes） completed the 48-week follow-up. There was no significant difference between the PRP and PRP-Plus groups with respect to age, gender, type or duration of diabetes, area of fluorescein leakage from active neovascularizations （NVs）, BCVA or CSMT at baseline. The mean vitreous clear-up time was 12.1±3.4wk after PRP and 8.4±3.5wk after PRP combined with IVB. The mean time interval from treatment to complete NVD regression on FA examination was 15.2±3.5wk in PRP group and 12.5±3.1wk in PRP-Plus group. No significant difference in CSMT was observed between the groups throughout the study period. However, the total area of actively leaking NVs was significantly reduced in the PRP-Plus group compared with the PRP group （P〈0.05）. Patients received an average of 1.3 injections （range： 1-2）. Ten eyes （27.8%） underwent 2 injections. Two eyes had ocular complicatio

关键词： panrctinal photocoagulation intravitreal bevacizumab high-risk proliferative diabetic retinopathy neovascularization on the disc

Differential DNA methylation analysis of SUMF2,ADAMTS5,and PXDN provides novel insights into colorectal cancer prognosis prediction in Taiwan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2022年第8期28卷 825-839页

作者： Jing-quan Su Pin-Yu Lai Pei-Hsuan Hu Je-Ming Hu Pi-Kai Chang chao-yang chen Jia-Jheng Wu Yu-Jyun Lin Chien-An Sun Tsan yang Chih-Hsiung Hsu Hua-Ching Lin Yu-Ching Chou School of Medicine National Defense Medical CenterTaipei 114TaiwanChina School of Public Health National Defense Medical CenterTaipei 114TaiwanChina Division of Colorectal Surgery Department of surgeryTri-Service General HospitalNational Defense Medical CenterTaipei 114TaiwanChina Graduate Institute of Medical Sciences National Defense Medical CenterTaipei 114TaiwanChina Department of Public Health College of MedicineFu-Jen Catholic UniversityNew Taipei City 242TaiwanChina Big Data Research Center College of MedicineFu-Jen Catholic UniversityNew Taipei City 242TaiwanChina Department of Health Business Administration Meiho UniversityPingtung County 912TaiwanChina Division of Colorectal Surgery Department of SurgeryCheng-Hsin General HospitalTaipei 112TaiwanChina

BACKGROUND Patients with colorectal cancer(CRC)undergo surgery,as well as perioperative chemoradiation or adjuvant chemotherapy primarily based on the tumor–node–metastasis(TNM)cancer staging ***,treatment responses and prognostic outcomes of patients within the same stage vary *** potential use of novel biomarkers can improve prognostication and shared decision making before implementation into certain *** To investigate whether SUMF2,ADAMTS5,and PXDN methylation status could be associated with CRC *** We conducted a Taiwan region cohort study involving 208 patients with CRC recruited from TriService General Hospital and applied the candidate gene approach to identify three genes involved in oncogenesis pathways.A methylation-specific polymerase chain reaction(MS-PCR)and Epi TYPER DNA methylation analysis were employed to detect methylation status and to quantify the methylation level of candidate genes in tumor tissue and adjacent normal tissue from *** evaluated SUMF2,ADAMTS5,and PXDN methylation as predictors of prognosis,including recurrence-free survival(RFS),progression-free survival(PFS),and overall survival(OS),using a Cox regression model and Kaplan–Meier *** We revealed various outcomes related to methylation and *** shorter PFS and OS were associated with the CpG_3+CpG_7 hypermethylation of SUMF2 from tumor tissue compared with CpG_3+CpG_7 hypomethylation[hazard ratio(HR)=2.24,95%confidence interval(CI)=1.03-4.85 for PFS,HR=2.56 and 95%CI=1.08-6.04 for OS].By contrast,a significantly longer RFS was associated with CpG_2 and CpG_13 hypermethylation of ADAMTS5 from normal tissue compared with CpG_2 and CpG_13 hypomethylation[HR(95%CI)=0.15(0.03-0.71)for CpG_2 and 0.20(0.04-0.97)for CpG_13].The relationship between the methylation status of PXDN and the prognosis of CRC did not reach statistical *** Our study found that CpG_3+CpG_7 hypermethylation o

关键词： DNA methylation Biomarkers Tumor tissue Adjacent normal tissue Prognosis prediction Colorectal cancer