检索结果-南通市图书馆

Possible Habitats for nH_(3),nH_(2)D,H^(13)Cn,HC^(15)n,SO,and C^(18)O in the Initial Conditions of High-mass Star Formation

引用

Research in Astronomy and Astrophysics 2024年第4期24卷 237-252页

作者： quan.Ling Cui Chuan-Peng Zhang jun-Jie Wang national Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China College of Science Qiqihar UniversityQiqihar 161006China Guizhou Radio Astronomical Observatory Guizhou UniversityGuiyang 550000China

The initial condition of high-mass star formation is a complex area of study because of the high densities(n_(H_(2))>106cm^(-3))and low temperatures(T_(dust)<18 K)*** such conditions,many molecules become depleted fro... 详细信息

The initial condition of high-mass star formation is a complex area of study because of the high densities(n_(H_(2))>106cm^(-3))and low temperatures(T_(dust)nditions,many molecules become depleted from the gas phase by freezing out onto dust ***,the n-bearing and deuterated species could remain gaseous under these extreme conditions,suggesting that they may serve as ideal *** this paper,using the Plateau de Bure Interferometer and Very Large Array observations at 1.3 mm,3.5 mm,and 1.3 cm,we investigate the possible habitats for nH_(3),nH_(2)D,H^(13)Cn,HC^(15)n,SO,and C^(18)O in eight massive precluster and protocluster clumps G18.17,G18.21,G23.97n,G23.98,G23.44,G23.97S,G25.38,and *** found that the nH3cores are in good agreement with the 3.5 mm peak emission,but the nH_(3)is much more extended than the 3.5 mm emission *** SO distributions agree well with the 3.5 mm peaks for the evolved star formation stage,but we did not detect any SO emission in the four earliest star formation sources.C^(18)O is a poor tracer in conditions of the cold(■18 K)and dense(■10^(4)cm^(-3))cores,e.g.,the prestellar *** also found that the nH_(2)D cores are mainly located in the temperature range of 13.0-20.0 K,and the nH_(2)D lines may be strongly depleted above 20 K.

关键词： galaxies:star formation techniques:interferometric methods:observational

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multiwavelength Observations of the Infrared Dust Bubble n75 and its Surroundings

引用

Research in Astronomy and Astrophysics 2024年第4期24卷 262-270页

Infrared dust bubbles play an important role in the study of star formation and the evolution of the interstellar *** this work,we study the infrared dust bubble n75 and the infrared dark cloud G38.93 mainly using the tracers C^(18)O,HCO^(+),HnC and n_(2)H^(+)observed by the 30 m IRAM *** also study the targets using data from large-scale surveys:GLIMPSE,MIPSGAL,GRS,nRAO VLA Sky Survey and Bolocam Galactic Plane *** found that the C^(18)O emission is morphologically similar to the Spitzer IRAC 8.0μm ***1.1 mm cold dust emission of G38.93 shows an elongated structure from southwest to *** ionized gas from G38.93 is surrounded by polycyclic aromatic hydrocarbon emission,which may be excited by radiation from *** found that the identified young stellar objects tend to cluster around G38.93 and are mostly in class II with several class I cases distributed around n75,but no class II *** also found evidence of expanding feedback,which could have triggered star formation.

关键词： ISM:bubbles infrared:ISM galaxies:star formation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

narrowband blue emitter based on fused nitrogen/carbonyl combination with external quan.um efficiency approaching 30%

引用

Science China Chemistry 2024年第1期67卷 351-359页

作者： Long Chen Jia-Heng Cai You-jun Yu Yang-Kun Qu Sheng-Yi Yang Sheng-nan Zou Rui-Hong Liu Dong-Ying Zhou Liang-Sheng Liao Zuo-quan.Jiang Institute of Functional nano&Soft Materials(FUnSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyMacao 999078China

Multi-resonance thermally activated delayed fluorescence(MR-TADF)emitters can enable narrowband emission with high color purity and electroluminescence ***/carbonyl(n/C=O)system is receiving increasing attention while the nitrogen/boron(n/B)system has been widely *** decoration is an effective approach for n/B type MR-TADF system but always leads to broadening and red-shifting of the emission band in n/C=O MR-TADF *** attribute these unfavorable phenomena to the formation of intramolecular charge transfer between the MR-core and peripheral *** address this issue,we have developed a new strategy by decorating DMQAO(a fused n/C=O MR-core)with a triazine acceptor and a neutral terphenyl group to construct MTDMQAO and MBDMQAO,*** introduction of the triazine acceptor not only realizes efficient narrowband emission in MTDMQAO,but also accelerates the reverse intersystem crossing process through enhanced spin-orbital *** a result,MTDMQAO exhibits a significantly higher external quan.um efficiency of 29.4%compared to the referent emitters,validating the rationality of our derivation *** study highlights the potential of the n/C=O system for MR-TADF emitters and provides important insights for understanding the difference between n/B and n/C=O systems.

关键词： carbonyl group narrowband acceptor decoration thermally activated delayed fluorescence OLEDs

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

铜纳米颗粒催化剂的重构及其合成碳酸二甲酯性能研究

引用

燃料化学学报（中英文） 2024年第3期52卷 335-342页

作者：裴永丽权燕红任军山西能源学院能源化学与材料工程系山西晋中030600 太原理工大学省部共建煤基能源清洁高效利用国家重点实验室山西太原030024 太原理工大学化学工程与技术学院山西太原030024 清华大学山西清洁能源研究院山西太原030024

甲醇氧化羰基化合成碳酸二甲酯(DMC)是中国重点开发的现代煤化工路线,其关键在于高性能催化剂的设计研发。本研究采用液相重构法,通过调变溶剂种类、气氛和压力制得高效铜团簇催化剂,在DMC合成反应中时空收率(STY_(DMC))高达3520 mg/(g... 详细信息

甲醇氧化羰基化合成碳酸二甲酯(DMC)是中国重点开发的现代煤化工路线,其关键在于高性能催化剂的设计研发。本研究采用液相重构法,通过调变溶剂种类、气氛和压力制得高效铜团簇催化剂,在DMC合成反应中时空收率(STY_(DMC))高达3520 mg/(g·h),经过10次循环,STY_(DMC)下降21.8%。n2吸附-脱附、XRD、TEM、STEM等表征手段表明,强还原性的CO不但可使铜纳米颗粒(~9.7 nm)部分重构为亚纳米团簇(~1.34 nm),同时有效维持了Cu^(0)物种的存在,从而提升了催化活性和稳定性。进一步研究表明,铜重构的发生取决于气氛-金属-载体三者的相互作用,且随氧化、还原性气氛的变化呈可逆状态。

关键词：碳酸二甲酯铜团簇液相重构高活性和稳定性

来源：

维普期刊数据库

同方期刊数据库

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

Combination therapy with oncolytic virus and T cells or mRnA vaccine amplifies antitumor effects

引用

Signal Transduction and Targeted Therapy 2024年第6期9卷 2655-2668页

作者： Rao Fu Ruoyao Qi Hualong Xiong Xing Lei Yao Jiang Jinhang He Feng Chen Liang Zhang Dekui Qiu Yiyi Chen Meifeng nie Xueran Guo Yuhe Zhu Jinlei Zhang Mingxi Yue Jiali Cao Guosong Wang Yuqiong Que Mujing Fang Yingbin Wang Yixin Chen Tong Cheng Shengxiang Ge jun Zhang quan.Yuan Tianying Zhang ningshao Xia State Key Laboratory of Vaccines for Infectious Diseases Xiang An Biomedicine LaboratoryDepartment of Laboratory MedicineSchool of Public Health&School of Life SciencesXiamen UniversityXiamen 361102 FujianChina national Institute of Diagnostics and Vaccine Development in Infectious Diseases Xiamen 361102 FujianChina

Antitumor therapies based on adoptively transferred T cells or oncolytic viruses have made significant progress in recent years,but the limited efficiency of their infiltration into solid tumors makes it difficult to achieve desired antitumor effects when used *** this study,an oncolytic virus(rVSV-LCMVG)that is not prone to induce virus-neutralizing antibodies was designed and combined with adoptively transferred T *** transforming the immunosuppressive tumor microenvironment into an immunosensitive one,in B16 tumor-bearing mice,combination therapy showed superior antitumor effects than *** occurred whether the OV was administered intratumorally or *** therapy significantly increased cytokine and chemokine levels within tumors and recruited CD8^(+)T cells to the TME to trigger antitumor immune *** with adoptively transferred T cells and subsequent oncolytic virotherapy sensitizes refractory tumors by boosting T-cell recruitment,downregulating the expression of PD-1,and restoring effector T-cell *** offer a combination therapy with greater translational value,mRnA vaccines were introduced to induce tumor-specific T cells instead of adoptively transferred T *** combination of OVs and mRnA vaccine also displays a significant reduction in tumor burden and prolonged *** study proposed a rational combination therapy of OVs with adoptive T-cell transfer or mRnA vaccines encoding tumor-associated antigens,in terms of synergistic efficacy and mechanism.

关键词： transferred rational boosting

来源：

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

铈改性CuMn/Al_(2)O_(3)/堇青石整体催化剂的甲苯催化燃烧性能研究

引用

燃料化学学报（中英文） 2024年第1期52卷 55-64页

作者：代宇航李凯歌赵金仙任军权燕红太原理工大学省部共建煤基能源清洁高效利用国家重点实验室山西太原030024 太原理工大学化学工程与技术学院山西太原030024

本研究以堇青石为载体,采用超声浸渍法制备了一系列CuMnCe_(x)/Al_(2)O_(3)/堇青石整体式催化剂,同时,通过n_(2)吸附-脱附、XRD、SEM、EDX、H_(2)-TPR、O_(2)-TPD、XPS和EPR等方法对样品的物理、化学性质进行了系统的表征分析。实验结... 详细信息

本研究以堇青石为载体,采用超声浸渍法制备了一系列CuMnCe_(x)/Al_(2)O_(3)/堇青石整体式催化剂,同时,通过n_(2)吸附-脱附、XRD、SEM、EDX、H_(2)-TPR、O_(2)-TPD、XPS和EPR等方法对样品的物理、化学性质进行了系统的表征分析。实验结果表明,CuMnCe_(x)/Al_(2)O_(3)/堇青石整体式催化剂中的Ce含量明显影响甲苯催化燃烧性能。其中,CuMnCe_(2)/Al_(2)O_(3)/堇青石整体式催化剂对甲苯氧化具有最高活性,当甲苯浓度为1 g/L、空速为78000 mL/(g·h)、温度为263℃时甲苯转化率达到90%,究其原因为CeO_(2)在CuMnO_(x)上分散均匀,不仅提高了氧空位的浓度和氧物种的迁移率,还增强了催化剂的低温还原性。同时,CuMnCe_(2)/Al_(2)O_(3)/堇青石整体式催化剂在长期评价和循环测试中呈现良好的稳定性。

关键词：甲苯催化燃烧整体式催化剂 CuMnCe_(x)复合氧化物

来源：

维普期刊数据库

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

泄爆条件对管内气粉两相混合体系燃爆特性的影响

引用

爆炸与冲击 2024年第7期44卷 186-196页

作者：朱文艳汪泉张军徐小猛方敬贤李雪交安徽理工大学化工与爆破学院安徽淮南232001 安徽省爆破器材与技术工程实验室安徽淮南232001 安徽理工大学煤炭安全精准开采国家地方精准开采联合研究中心安徽淮南232001

为探究气粉两相混合体系泄爆特性变化规律,以甲烷-硝酸铵为实验介质,利用自行搭建的不锈钢火焰加速管道开展了泄爆口不同静态动作压力(p_(st))的燃爆实验,着重研究了p_(st)对气粉两相燃爆压力、火焰传播速度和泄爆火焰形态的影响规律。p... 详细信息

为探究气粉两相混合体系泄爆特性变化规律,以甲烷-硝酸铵为实验介质,利用自行搭建的不锈钢火焰加速管道开展了泄爆口不同静态动作压力(p_(st))的燃爆实验,着重研究了p_(st)对气粉两相燃爆压力、火焰传播速度和泄爆火焰形态的影响规律。p_(st)由泄爆口阻塞比(θ)和泄爆膜层数(n)决定,θ和n增大的共同作用使p_(st)升高。p_(st)升高将增强管道对气粉和反应产物冲出管外的约束,增大管内流体的黏滞效应,促进管内气粉两相反应,降低未燃气在管外二次爆炸的强度。对爆燃压力进行分析,发现p_(st)从2.97 kPa升高至14.64 kPa时,爆燃压力时程曲线呈含维稳平台的双峰结构。第一压力峰值从5.48 kPa增大至10.20 kPa,维稳时间从6 ms延长至25 ms,第二压力峰值从23.03 kPa减小至9.71 kPa;p_(st)为16.08和24.12 kPa时,破膜前压力多次叠加反射,致使泄爆膜压力时程曲线呈特殊振荡上升的三峰结构。对火焰传播速度进行分析,发现p_(st)升高使火焰的平均传播速度从161.33 m/s降低至67.99 m/s。对泄爆火焰进行分析,发现当n=2时,θ增大将使泄爆火焰结构由簇状转变为射流状;θ=88.9%时,泄爆火焰呈典型的射流状。θ增大和n增大均使火焰亮度逐渐降低,火焰发光区长度减小,破膜至火焰出现时间间隔和火焰持续时间延长。

关键词：泄爆气粉两相静态动作压力爆燃压力火焰形态

来源：

维普期刊数据库

同方期刊数据库

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

高营养质量指数型肠内营养对高龄急性心衰病人临床疗效观察

引用

肠外与肠内营养 2024年第2期31卷 87-91,100页

作者：卞月梅金军吴玉泉管成倩徐俊松杭州市第九人民医院营养科浙江杭州311225 杭州市第九人民医院老年病科浙江杭州311225 中国人民解放军联勤保障部队第九〇三医院老年病科浙江杭州310013 中国人民解放军联勤保障部队第九〇三医院营养科浙江杭州310013

目的:观察高营养质量指数(InQ)型肠内营养对高龄急性心衰病人临床疗效的影响。方法:将70例来自杭州市第九人民医院和中国人民解放军联勤保障部队第九〇三医院老年病科的有营养风险需行鼻饲喂养的高龄急性心衰病人随机分为观察组和对照组... 详细信息

目的:观察高营养质量指数(InQ)型肠内营养对高龄急性心衰病人临床疗效的影响。方法:将70例来自杭州市第九人民医院和中国人民解放军联勤保障部队第九〇三医院老年病科的有营养风险需行鼻饲喂养的高龄急性心衰病人随机分为观察组和对照组各35例,对照组采用标准配方的肠内营养治疗,观察组采用高InQ型肠内营养治疗。干预4周,比较两组病人鼻饲喂养能量及蛋白质供给量、肠外营养使用量、营养指标、心功能指标、胃肠不良反应发生率等的差异。结果:干预后,观察组鼻饲喂养能量及蛋白质供给量明显高于对照组(P0.05)。结论:高InQ型肠内营养更易满足高龄心衰病人的目标营养需求,减少肠外营养使用量,有利于改善病人营养状况,促进心功能的恢复。

关键词：高InQ 肠内营养高龄急性心衰临床疗效

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

3种人工湿地基质材料对氨氮的吸附特性

引用

环境科学 2024年第3期45卷 1577-1585页

作者：何强陈博文杨雨静周全刘彦君王志刚程呈重庆大学三峡库区生态环境教育部重点实验室重庆400044 湖南省建筑设计院集团股份有限公司长沙400012 长江重庆航道工程局重庆400011

对陶粒、石英砂和砾石这3种人工湿地基质材料进行了氨氮(nH_(4)^(+)-n)吸附特性研究.通过扫描电镜和BET比表面积分析仪对材料进行表征分析,发现陶粒表面相比石英砂和砾石更为粗糙,内部孔隙也较发达,陶粒(18.97 m^(2)·g^(-1))比表面积... 详细信息

对陶粒、石英砂和砾石这3种人工湿地基质材料进行了氨氮(nH_(4)^(+)-n)吸附特性研究.通过扫描电镜和BET比表面积分析仪对材料进行表征分析,发现陶粒表面相比石英砂和砾石更为粗糙,内部孔隙也较发达,陶粒(18.97 m^(2)·g^(-1))比表面积高于石英砂和砾石.在纯氨氮溶液和模拟污水厂出水一级B标准的混合溶液中,3种基质对nH_(4)^(+)-n的吸附能力均表现为:陶粒>砾石>石英砂.陶粒对nH_(4)^(+)-n的饱和吸附容量在混合溶液中最大(63.55 mg·g^(-1)).陶粒对nH_(4)^(+)-n的吸附过程符合伪二级动力学模型(在纯氨氮溶液中R^(2)为0.99、在混合溶液中R^(2)为0.98).在纯氨氮溶液中运用Freundlich和Langmuir模型对等温吸附试验结果进行拟合,发现Freundlich模型(R^(2)=0.93)描述陶粒的吸附特性比Langmuir模型更为精确(R^(2)为0.93),表明陶粒对nH_(4)^(+)-n的吸附为多层吸附.综上所述,陶粒的吸附容量较强,在混合溶液中吸附容量较纯氨氮溶液增大了31%,适用于作为人工湿地基质填料.

关键词：人工湿地基质吸附氨氮陶粒

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Jianpi Gushen Huayu decoction ameliorated diabetic nephropathy through modulating metabolites in kidney,and inhibiting TLR4/nF-κB/nLRP3 and JnK/P38 pathways

引用

World Journal of Diabetes 2024年第3期15卷 502-518页

作者： Zi-Ang Ma Li-Xin Wang Hui Zhang Han-Zhou Li Li Dong Qing-Hai Wang Yuan-Song Wang Bao-ChaoPan Shu-Fang Zhang Huan-Tian Cui Shu-quan.Lv Graduate School Hebei University of Chinese MedicineShijiazhuang 050000Hebei ProvinceChina Department of Endocrinology Cangzhou Hospital of Integrated Traditional Chinese Medicine and Western Medicine of Hebei Province Affiliated to Hebei University of Chinese MedicineCangzhou 061000Hebei ProvinceChina School of Integrative Medicine Tianjin University of Traditional Chinese MedicineTianjin 300000China The First School of Clinical Medicine Yunnan University of Traditional Chinese MedicineKunming 065000Yunnan ProvinceChina Department of Endocrinology Hebei Cangzhou Hospital of Integrative MedicineCangzhou 061000Hebei ProvinceChina

BACKGROUnD Jianpi Gushen Huayu Decoction(JPGS)has been used to clinically treat diabetic nephropathy(Dn)for many ***,the protective mechanism of JPGS in treating Dn remains *** To evaluate the therapeutic effects and the possible mechanism of JPGS on *** We first evaluated the therapeutic potential of JPGS on a Dn mouse *** then investigated the effect of JPGS on the renal metabolite levels of Dn mice using non-targeted ***,we examined the effects of JPGS on c-jun n-terminal kinase(JnK)/P38-mediated apoptosis and the inflammatory responses mediated by toll-like receptor 4(TLR4)/nuclear factor-kappa B(nF-κB)/nOD-like receptor family pyrin domain containing 3(nLRP3).RESULTS The ameliorative effects of JPGS on Dn mice included the alleviation of renal injury and the control of inflammation and oxidative *** metabolomic analysis revealed that JPGS altered the metabolites of the kidneys in Dn mice.A total of 51 differential metabolites were *** analysis results indicated that nine pathways significantly changed between the control and model groups,while six pathways significantly altered between the model and JPGS *** related to cysteine and methionine metabolism;alanine,tryptophan metabolism;aspartate and glutamate metabolism;and riboflavin metabolism were identified as the key pathways through which JPGS affects *** experimental validation showed that JPGS treatment reduced the expression of TLR4/nF-κB/nLRP3 pathways and JnK/P38 pathway-mediated apoptosis related *** JPGS could markedly treat mice with streptozotocin(STZ)-induced Dn,which is possibly related to the regulation of several metabolic pathways found in ***,JPGS could improve kidney inflammatory responses and ameliorate kidney injuries in Dn mice via the TLR4/nF-κB/nLRP3 pathway and inhibit JnK/P38 pathwaymediated apoptosis in Dn mice.

关键词： Diabetic nephropathy Jianpi Gushen Huayu Decoction Oxidative stress Inflammation Untargeted metabolomics Toll-like receptor 4/nuclear factor-kappa B/nOD-like receptor family pyrin domain containing 3 pathway c-jun n-terminal kinase/P38-mediated apoptosis

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：