检索结果-南通市图书馆

Chinese Physics B 2020年第10期29卷 255-260页

作者： Ya-Fei Zhang Yu-Tao Feng Di Fu Peng-Chong Wang Jian Sun qing-lan Bai Xi'an Institute of Optics and Precision Mechanics Chinese Academy of SciencesXi'an 710119China University of Chinese Academy of Sciences Beijing 100049China

Instrument drifts introduce additional phase errors into atmospheric wind measurement of Doppler asymmetric spatial heterodyne spectroscopy (DASH). Aiming at the phase sensitivity of DASH to instrument drifts, in this paper we calculate the optical path difference (OPD) and present an accurate formula of DASH interferogram. By controlling variables in computational ray-tracing simulations and laboratory experiments, it is indicated that initial phase is directly determined by incident wavenumber, OPD offset and field of view (FOV). Accordingly, it is indicated that retrieved phase of DASH is sensitive to slight structural change caused by instrument drift, which provides the proof of necessary-to-track and -correct phase errors from instrument drifts.

关键词： atmospheric wind measurement Doppler asymmetric spatial heterodyne spectroscopy optical path difference interference phase

Indica rice restorer lines with large sink potential exhibit improved nutrient transportation to the panicle,which enhances both yield and nitrogen-use efficiency

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2021年第6期20卷 1438-1456页

作者： TIAN qing-lan HE Lian-hua LIAO Shuang LI Wu DENG Fei ZHOU Wei ZHONG Xiao-yuan REN Wan-jun Key Laboratory of Crop Ecophysiology and Farming System in Southwest China/Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province/College of Agronomy Sichuan Agricultural UniversityChengdu 611130P.R.China Biotechnology Research Institute Guangxi Academy of Agricultural SciencesNanning 530007P.R.China

The yield and nitrogen use efficiency(NUE)of hybrid rice combinations are closely related to restorer ***,it is essential to evaluate the agronomic characteristics of restorer lines with high yield and high NUE(HYHN).However,it is unclear which restorer lines are HYHN,and neither have the common agronomic traits of the HYHN restorer lines been *** to address this issue,we conducted two filed experiments using three nitrogen applications,which screened five HYHN restorer lines from 15 indica restorer ***,NUE and nutrient transportation of restorer lines with different yields and NUE types were *** and total nitrogen absorption in aboveground biomass(TNA)increased,whereas NUE for grain production decreased with increasing nitrogen application *** HYHN restorer lines had large spikelets and high weight per panicle that were significantly positively correlated with yield and ***,large sink potential may be beneficial for both yield and *** further studied the differences in nutrient transportation to panicles between the HYHN and low yield and low NUE(LYLN)restorer lines and found that the former had a higher nitrogen absorption level and dry matter weight ratios of panicle in ***,the HYHN lines also had a higher root and neck-panicle node bleeding intensity per stem after heading and more developed vascular bundles of neck-panicle nodes and leaves than the LYLN lines,which could contribute to the transportation of nutrients from root to ground and from stem and leaf to ***,the advantages of large sink potential of the HYHN restorer lines include large nutrient accumulation in and distribution to the panicles and smooth flow of nutrients along the transportation channels.

关键词： indica hybrid rice restorer lines grain yield nitrogen-use efficiency sink potential nutrient transportation

Desmosdumotin B: A New Special Flavone from Desmos dumosus

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2001年第1期12卷 49-50页

作者： Jiu Hong WU Shi Long MAO Shi Xuan LIAO Yang Hua YI Chuan qing lan Zhong Wu SU Department of Pharmacy 306 Hospital of PLABeijing 100101 School of Pharmacy Second Military Medical UniversityShanghai 200433

A new special flavone, named desmosdumotin B, was isolated from the roots of D. dumosus and its chemical structure identified as 5-hydroxy-7-one-6,8,8-trimethylflavone by spectral analysis and X-ray.

关键词： Annonaceae Desmos dumosus desmosdumotin B

“双N认证”多证书制度的双元制本土化实践探索——以机电一体化专业为例

在线全文

学校读者我要写书评

暂无评论

武汉船舶职业技术学院学报 2024年第4期23卷 21-25页

作者：钮嘉颖吕金华唐依明徐蓝青武汉船舶职业技术学院湖北武汉430050

在国家职业教育改革的大环境下,构建了一种全新的双元制本土化“双N认证”多证书制度,在本区域内遴选大、中、小型稳定发展的企业,打造多层次校企双元育人平台,通过国家、学校、N家企业共同认证,构建国家认证职业技能等级证书、国家认证... 详细信息

在国家职业教育改革的大环境下,构建了一种全新的双元制本土化“双N认证”多证书制度,在本区域内遴选大、中、小型稳定发展的企业,打造多层次校企双元育人平台,通过国家、学校、N家企业共同认证,构建国家认证职业技能等级证书、国家认证X证书和企业认证技能等级证书等多种职业标准证书制度,实现多级目标激励和多通道人才培养。匹配目标岗位精确构建标准参照考试题库,将证书知识点、技能考核点融入教学内容中,构建“认知教学-专业综合实训-证书”的教学体系,实现岗、课、证融通,为区域产业输送高素质复合型技术技能人才,实现多方共赢。

关键词：双元制本土化多证书制度课证融通

Antiviral Therapy Favors a Lower Risk of Liver Cirrhosis in HBeAg-negative Chronic Hepatitis B with Normal Alanine Transaminase and HBV DNA Positivity

在线全文

学校读者我要写书评

暂无评论

Journal of Clinical and Translational Hepatology 2023年第7期11卷 1465-1475页

作者： Jing Zhou Fa-Da Wang lan-qing Li Yu-Jin Li Shi-Yan Wang En-Qiang Chen Center of Infectious Diseases West China HospitalSichuan UniversityChengduSichuanChina Department of Pharmacy West China HospitalSichuan UniversityChengduSichuanChina

Background and Aims:Direct evidence on the outcomes of hepatitis B e antigen(HBeAg)-negative chronic hepatitis(CHB)patients with normal alanine transaminase after long-term antiviral treatment is ***:HBeAg-nega-tive patients with normal ALT and positive HBV DNA(≥20 IU/mL)were retrospectively *** endpoints included virological response(HBV DNAlanine transaminase,especially in those with HBV DNA22,000 IU/mL.

关键词： Chronic hepatitis B Negative HBeAg Normal ALT Gray zone Antiviral therapy

OPERATIONAL FORECAST OF RAINFALL INDUCED BY lanDFALLING TROPICAL CYCLONES ALONG GUANGDONG COAST

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Tropical Meteorology 2020年第1期26卷 1-13页

作者： LI qing-lan LIU Bing-rong WAN Qi-lin WANG Yu-qing LI Guang-xin LI Tie-jian lan Hong-ping FENG Sheng-zhong LIU Chun-xia Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhenGuangdong 518055 China Guangzhou Institute of Tropical and Marine Meteorology CMAGuangzhou 510641 China University of Hawaii at Manoa HonoluluHI 96822 USA Department of Hydraulic Engineering Tsinghua UniversityBeijing 100084 China Shenzhen Meteorological Bureau ShenzhenGuangdong 518040 China

Following previous studies of the rainfall forecast in Shenzhen owing to landfalling tropical cyclones(TCs),a nonparametric statistical scheme based on the classification of the landfalling TCs is applied to analyze and forecast the rainfall induced by landfalling TCs in the coastal area of Guangdong province,*** the TCs landfalling with the distance less than 700 kilometers to the 8 coastal stations in Guangdong province during 1950—2013 are categorized according to their landfalling position and *** daily rainfall records of all the 8 meteorological stations are obtained and *** maximum daily rainfall and the maximum 3 days’accumulated rainfall at the 8 coastal stations induced by each category of TCs during the TC landfall period(a couple of days before and after TC landfalling time)from 1950 to 2013 are computed by the percentile estimation and illustrated by *** boxplots can be used to estimate the rainfall induced by landfalling TC of the same category in the *** statistical boxplot scheme is further coupled with the model outputs from the European Centre for Medium-Range Weather Forecasts(ECMWF)to predict the rainfall induced by landfalling TCs along the coastal *** TCs landfalling in south China from 2014 to 2017 and the corresponding rainfall at the 8 stations area are used to evaluate the performance of these boxplots and coupled boxplots *** show that the statistical boxplots scheme and coupled boxplots scheme can perform better than ECMWF model in the operational rainfall forecast along the coastal area in south China.

关键词： tropical cyclone coastal area rainfall forecast statistical boxplot scheme coupled boxplot scheme

Effect of ultrasonic field treatment on degassing of 2024 alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2021年第2期18卷 124-130页

作者： Zheng Jia Bing Yu qing lan Tong Wang Li Fu Yu-lin Ma Qi-chi Le Jian-zhong Cui College of Mechanical Engineering Shenyang UniversityShenyang 110044China Key Laboratoiy of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The 2024 aluminum alloy was prepared with different ultrasonic *** of ultrasonic treatment parameters including ultrasonic power,treatment time,treatment temperature,and frequency resonance,as well as C_(2)Cl_(6) degasser on degassing of the 2024 aluminum alloy were *** indicate that increasing ultrasonic power at the same ultrasonic treatment time can improve the degassing *** optimum degassing efficiency can be obtained under the resonant ultrasound *** the combination of 1%C_(2)Cl_(6) addition and 150 W ultrasonic treatment for 40 s,the hydrogen content of the alloy is decreased by 52.9%.At the same time,the tensile strength and elongation are increased by 28.3%and 92.3%,respectively,and the yield strength is slightly increased by 6.7%.The degassing mechanism is also discussed.

关键词： ultrasonic degassing C_(2)Cl_(6)degasser hydrogen content tensile properties

MicroRNA-34a promoting apoptosis of human lens epithelial cells through down-regulation of B-cell lymphoma-2 and silent information regulator

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2016年第11期9卷 1555-1560页

作者： qing-lan Li Hong-Yang Zhang Yong-Jie Qin Qian-Li Meng Xiao-Lei Yao Hai-Ke Guo Department of Ophthalmology Ruikang Hospital affiliated to Guangxi University of Chinese Medicine Department of Ophthalmology Guangdong General Hospital and Guangdong Academy of Medical Sciences Zhengzhou Aier Eye Hospital Aier School of OphthalmologyCentral South University

AIM： To investigate the role of micro RNA-34a（mi R-34a） in the induction of apoptosis of human lens epithelial（HLE-B3） cells. METHODS： The apoptosis of HLE-B3 cells was detected by Annexin V-PE apoptosis detection kit after the treatment with 200 μmol/L H2O2 for 24h and lentiviral mi R-34 a vector transfection. The expression of mi R-34 a in the cells was quantified by quantitative real time polymerase chain reaction（q RT-PCR） in response to H2O2 exposure and the vector transfection. The effects of overexpression of mi R-34 a on the expression of B-cell lymphoma-2（Bcl-2） and silent information regulator 1（SIRT1） was determined by q RT-PCR and Western blot. RESULTS： The expression of mi R-34 a was up-regulated by the treatment of H2O2 in HLE-B3 cells. The increased expression of mi R-34 a is accompanied with the cell apoptosis. Consistence with the H2O2 exposure,ectopic overexpression of mi R-34 a in HLE-B3 cells promoted cells apoptosis. Importantly the anti-apoptosis factors Bcl-2 and SIRT1 were reduced significantly by up-regulation of mi R-34 a in HLE-B3 ***： Mi R-34 a promotes the apoptosis of HLE-B3 cells by down-regulating Bcl-2 and SIRT1,suggesting that mi R-34 a may involve in the pathogenesis of cataract formation and targeting mi R-34 a may be a potentially therapeutic approach for treatment of cataract.

关键词： human lens epithelial cells microRNA-34a apoptosis

Optical coherence tomography angiography assessment of 577 nm laser effect on severe non-proliferative diabetic retinopathy with diabetic macular edema

维普期刊数据库评论

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) 2020年第8期13卷 1257-1265页

作者： Zi-Jing Li Jian-Hui Xiao Peng Zeng Rui Zeng Xiang Gao Yi-Chi Zhang Yu-qing lan Department of Ophthalmology Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou 510000Guangdong ProvinceChina Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou 510000Guangdong ProvinceChina

AIM:To quantitatively evaluate the effect of the combined use of 577-nm subthreshold micropulse macular laser(SML)and multi-point mode pan retinal laser photocoagulation(PRP)on severe non-proliferative diabetic retinopathy(NPDR)with central-involved diabetic macular edema(CIDME)using optical coherence tomography angiography(OCTA).METHODS:In this observational clinical study,86 eyes of 86 NPDR patients with CIDME who underwent SML and PRP treatment were *** were obtained 1 d before laser and post-laser(1 d,1 wk,1,3,and 6 mo)using AngioV ue software *** corrected visual acuity(BCVA,LogM AR),foveal avascular zone area(FAZ),choriocapillary flow area(Ch F),parafoveal vessel density(PVD),capillary density inside disc(CDD),peripapillary capillary density(PCD),macular ganglion cell complex thickness(m GCCT),central macular thickness(CMT),and subfoveal choroidal thickness(ChT)were compared between pre-and post-laser ***:BCVA remained stable during 6 mo postlaser therapy(pre-laser vs 6 mo post-laser:0.53±0.21 vs 0.5±0.15,P>0.05).PVD,ChF,ChT,CMT,and mGCCT significantly increased 1 d post-laser therapy[pre-laser vs 1 d post-laser:superficial PVD(%),40.51±3.42 vs 42.43±4.68;deep PVD(%),42.66±3.67 vs 44.78±4.52;ChF,1.72±0.21 vs 1.9±0.12 mm^2;ChT,302.45±69.74 vs 319.38±70.93μm;CMT,301.65±110.78 vs 320.86±105.62μm;m GCCT,105.71±10.72 vs 115.46±9.64μm;P0.05).Moreover,FAZ continuously increased while CDD and PCD continuously decreased in 6 mo after laser *** and ChT had a significant positive correlation with ChF and P

关键词： diabetic macular edema diabetic retinopathy subthreshold micropulse laser optical coherence tomography angiography

Syntheses and Crystal Structures of Bis-[oxo-bis(p-ferrocenylbenzoxy di-n-propyltin)](I) and Bis[oxo-bis(β-ferrocenoylpropionyloxy di-n-propyltin )](II)

维普期刊数据库评论

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 Journal of Structural Chemistry 2003年第6期22卷 647-652页

作者： PENG Bin SUN Li-Juan CHANG Wei-Xing XIE qing-lan② (National Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China) Nankai University National Key Laboratory of Elemento-Organic Chemistry 天津 300071

Bis-[oxo-bis(p-ferrocenylbenzoxy di-n-propyltin)] I and bis-[oxo-bis(-ferrocenoyl- propionyloxy di-n-propyltin)] II were synthesized and their crystal structures have been determined by X-ray diffraction analysis. The compound I2C6H6 ([(FcC6H4COOSnPr2)2O]22C6H6 or C92H108Fe4O10Sn42C6H6, Mr = 2384.16) is of triclinic, space group P?with a = 12.826(4), b = 13.099(5), c = 17.539(5) ? = 78.229(5), ?= 71.852(5), = 62.746(5)? V = 2483(1) ?, Z = 1, Dc = 1.490 g/cm3, = 0.71073 ? (MoK? =1.611 mm-1 and F(000) = 1128. The structure was refined to R = 0.0491 and wR = 0.1053 for 4690 unique reflections with I > 2(I). The compound IIC6H6 ([(FcCOCH2CH2COOSnPr2)2O]2C6H6 or C80H108Fe4O14Sn4C6H6, Mr = 2115.93) is of triclinic, space group P?with a = 11.260(4), b = 14.126(5), c = 15.961(6) ? = 91.400(6), = 110.654(6), = 104.931(6), V = 2277(1) 3, Z = 1, Dc = 1.510 g/cm3, = 0.71073 ? (MoK? = 1.750 mm-1 and F(000) = 1046. The structure was refined to R = 0.0466 and wR = 0.1138 for 5061 unique reflections with I > 2(I). The two compounds have the similar structures: both are dimers containing centrosymmetric Sn2O2 cores. But there are some differences in the ligating modes between the carboxylate groups and the Sn atoms.

关键词： ferrocenecarboxylate diorganotin dimers X-ray diffraction