检索结果-南通市图书馆

Parameter analysis for a nuclear magnetic resonance gyroscope based on ^(133)Cs–^(129)Xe/^(131)Xe

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第2期26卷 161-165页

作者： Da-Wei Zhang zheng-yi xu Min Zhou Xin-Ye xu State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 China

We theoretically investigate several parameters for the nuclear magnetic resonance gyroscope based on ^（133）C_（s–）^（129）Xe/^（131）Xe. For a cell containing a mixture of ^（133）Cs at saturated pressure, we investigate the optimal quenching gas（N_2） pressure and the corresponding pump laser intensity to achieve 30% ^（133）Cs polarization at the center of the cell when the static magnetic field B0 is 5 μT with different ^（129）Xe/^（131）Xe pressure. The effective field produced by spin-exchange polarized ^（129）Xe or ^（131）Xe sensed by ^（133）Cs can also be discussed in different^（129）Xe/^（131）Xe pressure conditions. Furthermore,the relationship between the detected signal and the probe laser frequency is researched. We obtain the optimum probe laser detuning from the D2（6~2S_（1/2）→ 6~2P_（3/2）） resonance with different ^（129）Xe/^（131）Xe pressure owing to the pressure broadening.

关键词： nuclear magnetic resonance gyroscope optical pumping spin-exchange collision optical rotation

Preoperative localization and minimally invasive management of primary hyperparathyroidism concomitant with thyroid disease

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第9期8卷 626-631页

作者： zheng yi-xiong xu Shao-ming WANG Ping, CHEN Li Department of Surgery the Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310009 China

The coexistence of thyroid diseases with primary hyperparathyroidism (PHPT) can present a challenge in the clinical diagnosis and management for these patients. This study aims to determine the frequency of coexisting thyroid gland lesions in a consecutive series patients with PHPT, and to analyze the clinical features, diagnosis and treatment of these patients. Twenty-two cases of a total of 52 PHPT patients who had synchronous thyroid and parathyroid pathology were surgically managed in this study. Thirteen patients had ipsilateral thyroid nodules, and 9 patients had thyroid nodules in contralateral or bilateral side. Seven patients underwent direct parathyroidectomy and hemithyroidectomy via a mini-incision (about 3 cm), while other 15 procedures were converted to Kocher incision. Seventeen nodular goiter (32.7%), 2 thyroiditis (3.8%), 2 thyroid adenoma (3.8%) and 1 thyroid carcinoma (1.9%) coexisting with parathyroid adenoma were pathologically diagnosed. The sensitivity of preoperative ultra-sonography (US) and methoxy-isobutyl-isonitrile (MIBI) scintigraphy for parathyroid lesions was 63.6% and 85.7%; and the overall positive predictive values for MIBI and US were 100% and 95.5% respectively. A high incidence of thyroid diseases that coexisted with PHPT in literatures was briefly reviewed. Our study illustrated the need for clinical awareness of concomitant PHPT and thyroid disease. A combination of US, computed tomography (CT) and MIBI scintigraphy would be recommended for preoperative localization of enlarged parathyroid adenoma and for evaluation of thyroid lesions. Synchronous treatment of asso-ciated thyroid abnormalities is desirable, and open minimally invasive surgical approach with additional resection of isolated ipsilateral thyroid nodules is possible in some of these patients.

关键词： Hyperparathyroidism Thyroid diseases Imaging diagnosis Surgical treatment

Type-B response regulator OsRR22 forms a transcriptional activation complex with OsSLR1 to modulate OsHKT2;1 expression in rice

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2023年第12期66卷 2922-2934页

作者： Yutong Liu Xiaoyuan Peng Ao Ma Wenxin Liu Bao Liu Dae-Jin Yun zheng-yi xu Key Laboratory of Molecular Epigenetics of the Ministry of Education(MOE) Northeast Normal UniversityChangchun 130024China Department of Biomedical Science and Engineering Konkuk UniversitySeoul 05029Republic of Korea

Soil salinity severely limits crop yields and *** have evolved several strategies to mitigate the adverse effects of salinity,including redistribution and compartmentalization of toxic ions using ion-specific ***,the mechanisms underlying the regulation of these ion transporters have not been fully ***-of-function mutants of OsHKT2;1,which is involved in sodium uptake,exhibit strong salt stress-resistant *** this study,OsHKT2;1 was identified as a transcriptional target of the type-B response regulator ***-of-function osrr22 mutants showed resilience to salt stress,and OsRR22-overexpression plants were sensitive to salt ***22 was found to activate the expression of OsHKT2;1 by directly binding to the promoter region of OsHKT2;1 via a consensus cis-element of type-B response ***,rice DELLA protein OsSLR1 directly interacted with OsRR22 and functioned as a transcriptional *** study has uncovered a novel transcriptional regulatory mechanism by which a type-B response regulator controls sodium transport under salinity stress.

关键词： Oryza sativa type-B response regulator transcriptional regulation sodium transport

Plasma membrane-localized Hsp40/DNAJ chaperone protein facilitates OsSUVH7-OsBAG4-OsMYB106 transcriptional complex formation for Os HKT1;5 activation

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2023年第1期65卷 265-279页

作者： Yutong Liu Mengting Li Jinlei Yu Ao Ma Jie Wang Dae-Jin Yun zheng-yi xu Key Laboratory of Molecular Epigenetics of the Ministry of Education(MOE)Northeast Normal University Changchun 130024 China Department of Biomedical Science and Engineering Konkuk University Seoul South Korea

The salinization of irrigated land affects agricultural ***-AFFINITY POTASSIUM(K+)TRANSPORTER 1;5(OsHKT1;5)-dependent sodium(Na+)transport is a key salt tolerance mechanism during rice growth and *** a previously generated high-throughput activation tagging-based T-DNA insertion mutant pool,we isolated a mutant exhibiting salt stress-sensitive phenotype,caused by a reduction in OsHKT1;*** salt stress-sensitive phenotype of this mutant results from the loss of function of OsDNAJ15,which encodes plasma membranelocalized heat shock protein 40(Hsp40).osdnaj15loss-of-function mutants show decreased plant height,increased leaf angle,and reduced grain number caused by shorter panicle length and fewer *** the other háand,OsDNAJ15-overexpression plants showed salt stress-tolerant ***,salt stress facilitates the nuclear relocation of OsDNAJ15 so that it can interact with OsBAG4,and OsDNAJ15 and OsBAG4synergistically facilitate the DNA-binding activity of OsMYB106 to positively regulate the expression of OsHKT1;***,our results reveal a novel function of plasma membrane-localized Hsp40protein in modulating,alongside chaperon regulator OsBAG4,transcriptional regulation under salinity stress tolerance.

关键词： chaperon regulator Oryza sativa small heat shock protein sodium transport transcriptional regulation

HEXOKINASE1 forms a nuclear complex with the PRC2 subunits CURLY LEAF and SWINGER to regulate glucose signaling

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2022年第6期64卷 1168-1180页

作者： Yutong Liu Yunshu Bai Ning Li Mengting Li Wenxin Liu Dae-Jin Yun Bao Liu zheng-yi xu Key Laboratory of Molecular Epigenetics of the Ministry of Education(MOE) Northeast Normal UniversityChangchun 130024China Department of Biomedical Science and Engineering Konkuk UniversitySeoul 132‐798South Korea

The glucose sensor HEXOKINASE1(HXK1)integrates myriad external and internal signals to regulate gene expression and development in Arabidopsis ***,how HXK1 mediates glucose signaling in the nucleus remains ***,using immunoprecipitationcoupled mass spectrometry,we show that two catalytic subunits of Polycomb Repressive Complex 2,SWINGER(SWN)and CURLY LEAF(CLF),directly interact with catalytically active HXK1 and its inactive forms(HXK1^(G104D) and HXK1^(S177A))via their evolutionarily conserved SANT ***1,CLF,and SWN target common glucose-responsive genes to regulate glucose signaling,as revealed by RNA *** glucose-insensitive phenotypes of the Arabidopsis swn-1 and clf-50 mutants were similar to that of hxk1,and genetic analysis revealed that CLF,SWN,and HXK1 function in the same genetic ***,HXK1 is required for CLF-and SWN-mediated histone H3 lysine 27(H3K27me3)deposition and glucose-mediated gene ***,CLF and SWN affect the recruitment of HXK1 to its target *** findings support a model in which HXK1 and epigenetic modifiers form a nuclear complex to cooperatively mediate glucose signaling,thereby affecting the histone modification and expression of glucoseregulated genes in plants.

关键词： Arabidopsis thaliana glucose sensor hexokinase histone methylation transcriptional regulation

Contribution of Atmospheric Nitrogen Compounds to N Deposition in a Broadleaf Forest of Southern China

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2007年第3期17卷 360-365页

作者： HU zheng-yi xu Cheng-Kai ZHOU Li-Na SUN Ben-Hua HE Yuan-Qiu ZHOU Jing CAO Zhi-Hong State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of SciencesNanjing 210008 （China） College of Forest Resources and Environment Nanjing Forestry University Nanjing 210007 （China） College of Resources and Environment Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100（China）

A one-year study in a typical red soil region of southern China was conducted to determine atmospheric nitrogen (N) fluxes of typical N compounds (NH3, NH4-N, NO3-N, and NO2) and contribution of three sources (gas, rainwater, and particles) to N deposition. From July 2003 to June 2004, the total atmospheric N deposition was 70.7 kg N ha-1, with dry deposition accounting for 75% of the total deposition. Dry NH3 deposition accounted for 73% of the dry deposition and 55% of the total deposition. Moreover, NO2 contributed 11% of the dry deposition and 8% of the total deposition. Reduced N compounds (NH4+ and NH3) were the predominate contributors, accounting for 66% of the total deposition. Therefore, atmospheric N deposition should be considered when soil acidification and critical loads of atmospheric deposition on soils are estimated.

关键词： atmospheric deposition broadleaf forest nitrogen red soil soil acidification

基于网络拓扑结构的多摄像头移动对象辅助协同跟踪

在线全文

学校读者我要写书评

暂无评论

武汉大学学报（信息科学版） 2017年第8期42卷 1117-1122页

作者：郑毅许涛徐栋杨婷婷李响华东师范大学地理信息科学教育部重点实验室上海200062

针对当前公共安全监控系统在应对突发事件时,因监视器数量多、信息量大、事件变化快等因素而导致的不能及时有效地对移动对象进行跟踪的问题,提出了一种基于拓扑结构的多摄像头移动对象辅助协同跟踪方法。首先将城市路网中的摄像头监控... 详细信息

针对当前公共安全监控系统在应对突发事件时,因监视器数量多、信息量大、事件变化快等因素而导致的不能及时有效地对移动对象进行跟踪的问题,提出了一种基于拓扑结构的多摄像头移动对象辅助协同跟踪方法。首先将城市路网中的摄像头监控区域抽象为虚拟节点定位至结点弧段模型中,构建摄像头网络拓扑结构;根据拓扑关系搜索出与发现移动对象的摄像头关联的摄像头集合;再分析摄像头间的空间邻近关系和时间差异,获取时序关系最优的摄像头组作为重点监控区域进行移动对象跟踪,并定期进行协同更新。最后建立了一个模拟监控系统验证了利用多摄像头协同方法实现对移动对象实时跟踪的有效性。

关键词：网络拓扑结构多摄像头搜索多摄像头协同移动对象跟踪

Atmospheric Sulfur Deposition on Farmland in East China

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

Pedosphere 2005年第1期15卷 120-128页

作者： WANGTi-Jian YANGHao-Ming GAOLi-Jie ZHANGYan HUzheng-yi xuCheng-Kai DepartmentofAtmosphericScience NanjingUniversityNanjing210093China DepartmentofAtmosphericScience NanjingUniversityNanjing210093China／／KeyLaboratoryofMeteorologicalDisasterandEnvironmentalVariationNanjingInstituteofMeteorologyNanjing210044China StateKeyLaboratoryofSoilandSustainableAgriculture InstituteofSoilScienceChineseAcademyofScienceNanjing210008China

Atmospheric sulfur deposition onto typical farmland in East China was investigated using both field measurements and numerical modeling. The field measurements were conducted at the Experiment Station of Red Soil Ecology, Chinese Academy of Sciences, 10 km from yingtan, Jiangxi Province, East China, between November 1998 and October 1999, and at the Changshu Ecological Experiment Station, Chinese Academy of Sciences, in a rapidly developing region of Jiangsu Province, East China, between April 2001 and Marc…

关键词： atmospheric sulfur deposition East China farmland

Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 58-69页

作者： Jie Wang Wei Wang xuheng Chen Junfang Bao Qiuyue Hao Heng zheng Runsheng xu School of Chemistry and Materials Science Hubei Engineering UniversityXiaogan 432000China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model