检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

巴林左旗退耕还林的主要做法

林业科技情报 2022年第1期54卷 62-64页

作者：刘凤明巴林左旗林业和草原局内蒙古赤峰025450

退耕还林是治理我国水土流失和土地沙化的重大生态修复工程,也是推动我国生态文明建设的重要内容之一。近年来,巴林左旗旗委、政府始终坚持生态立旗的绿色发展理念,把退耕还林作为造福左旗、惠及民生的一件大事,远谋近施,持续发力,走出... 详细信息

退耕还林是治理我国水土流失和土地沙化的重大生态修复工程,也是推动我国生态文明建设的重要内容之一。近年来,巴林左旗旗委、政府始终坚持生态立旗的绿色发展理念,把退耕还林作为造福左旗、惠及民生的一件大事,远谋近施,持续发力,走出了一条生态造林与环境保护并重,加强推进绿色崛起的新路子。该文通过对巴林左旗退耕还林工程推进情况的走访,对巴林左旗退耕还林工作提出了若干建议,力求能够为类似的退耕还林工作提供参考。

关键词：退耕还林农民增收绿色发展

Frequency Regulation of VSC-MTDC System with Offshore Wind Farms

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

Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 275-286页

作者： Haoyu liu Chongru liu North China Electric Power University Beijing 102206China

Frequency regulation of voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC)system with offshore wind farms enhances the frequency stability by compensating the power for a disturbed AC ***,it is difficult to reasonably allocate frequency-regulation resources due to a lack of coordination mechanisms between wind farms and the MTDC ***,it is difficult for the frequency control of the wind farms to manage changes in wind speed;and the risk of wind-turbine stalls is ***,based on the kinetic energy of wind turbines and the power margin of the converters,the frequency-regulation capability of wind turbines is evaluated,and a dynamic frequency-support scheme considering the real-time frequency-support capability of the wind turbines and system frequency evolution is proposed to improve the frequency-support performance.A power adaptation technique at variable wind speeds is developed;the active power in the frequency-support stage and restoration stage is switched according to the wind speed.A hierarchical zoning frequency-regulation scheme is designed to use the frequency-regulation resources of different links in the MTDC system with wind *** simulation results show that the novel frequency-regulation strategy maintains frequency stability with wind-speed changes and avoids multiple frequency dips.

关键词： Wind generation voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC) frequency regulation cooperative control adaptive control variable wind speed

在线全文

学校读者我要写书评

暂无评论

药物和膳食纤维相结合的糖尿病综合治疗

中国现代医生 2016年第6期54卷 151-154,159页

作者：刘凤鸣湖南中医药大学药学院湖南长沙410208 西南濒危药材资源开发国家工程实验室广西南宁530023

膳食纤维是2型糖尿病的发病和治疗过程中非常重要的健康元素,不仅能够降低糖尿病的发病率,同时还可以提高糖尿病的治疗效果。更值得注意的是,膳食纤维能够提高组织细胞对于胰岛素的敏感性,改善胰岛素抵抗,这为2型糖尿病的病因治疗提供... 详细信息

膳食纤维是2型糖尿病的发病和治疗过程中非常重要的健康元素,不仅能够降低糖尿病的发病率,同时还可以提高糖尿病的治疗效果。更值得注意的是,膳食纤维能够提高组织细胞对于胰岛素的敏感性,改善胰岛素抵抗,这为2型糖尿病的病因治疗提供了可能。因此,本文在现有的药物治疗为主、饮食治疗为辅的糖尿病基本方案中强化膳食纤维在糖尿病治疗中的作用,通过长时间的药物和膳食纤维相结合的综合治疗,力求实现部分糖尿病患者对胰岛素的敏感性恢复至正常水平,以期达到取消药物治疗的目的。

关键词：膳食纤维糖尿病胰岛素抵抗胰岛素敏感性

在线全文

学校读者我要写书评

暂无评论

不同坡度偏压黄土隧道预留变形量的研究

现代隧道技术 2017年第1期54卷 130-137页

作者：金美海李栋梁刘新荣刘丰铭重庆大学土木工程学院重庆400045 山地城镇建设与新技术教育部重点实验室重庆400045 同济大学岩土工程系上海200092

由于黄土独特的物理力学性质以及偏压隧道特殊的不对称受力形式,使得浅埋偏压黄土隧道的预留变形量不同于一般隧道情况。文章以山西省孙家沟隧道为依托工程。通过对现场监测数据进行整理,利用最小二乘法进行回归分析,并使用有限元软件AN... 详细信息

由于黄土独特的物理力学性质以及偏压隧道特殊的不对称受力形式,使得浅埋偏压黄土隧道的预留变形量不同于一般隧道情况。文章以山西省孙家沟隧道为依托工程。通过对现场监测数据进行整理,利用最小二乘法进行回归分析,并使用有限元软件ANsYs进行数值模拟验证,得出了浅埋偏压黄土隧道围岩变形随偏压坡度变化的规律。研究表明,对于偏压坡度为15°~45°的V级围岩浅埋双洞黄土隧道,浅埋侧隧道的预留变形量可取为10-15 cm;而对于深埋侧隧道。当偏压坡度分别约为15°,30°和45°时,可分别预留约20~25 cm,25~30 cm和28~33 cm的变形量。

关键词：坡度偏压黄土隧道预留变形量

Acid-etching induced metal cation competitive lattice occupancy of perovskite quantum dots for efficient pure-blue QLEDs

在线全文

学校读者我要写书评

暂无评论

Interdisciplinary Materials 2024年第3期3卷 437-447页

作者： Hanwen Zhu Guoqing Tong Junchun Li Xuyong Tao Yang Shen Yuanyuan Sheng Lin Shi fengming Xie Jianxin Tang Yang Jiang School of Materials Science and Engineering Hefei University of TechnologyHefeiPeople's Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhouPeople's Republic of China

Low efficiency and spectral instability caused by the surface defects have been considerable issues for the mixed-halogen blue emitting perovskite quantum dots light-emitting diodes(PeQLEDs).Here,an in situ surface passivation to perovskite quantum dots(PeQDs)is realized by introducing the metal cations competitive lattice occupancy assisted with acid-etching,in which the longchain,insulating and weakly bond surface ligands are removed by addition of octanoic acid(OTAC).Meanwhile,the dissolved A-site cations(Na^(+))compete with the protonated oleyl amine and are subsequently anchored to the surface *** preadded lead bromide,acting as inorganic ligands,demonstrates strong bonding to the uncoordinated surface *** as-synthesized PeQDs show the boosted photoluminescence quantum yield(PLQY)and superior stability with longer *** a result,the PeQLEDs(470 nm)based on the OTAC-Na PeQDs exhibit an external quantum efficiency of 8.42%in the mixed halogen PeQDs(CsPb(Br_(x)Cl_(1−x))_(3)).Moreover,the device exhibits superior spectra stability with negligible *** competition mechanism in combination with in situ passivation strategy paves a new way for improving the performance of blue PeQLEDs.

关键词： acid etching blue PeQLEDs high-efficiency in situ passivation spectral stability

受油源断裂控制的不同层位油气运聚空间分布部位预测方法及其应用

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

吉林大学学报（地球科学版） 2024年第2期54卷 461-469页

作者：许凤鸣大庆油田公司勘探事业部黑龙江大庆163453

为了研究含油气盆地油源断裂附近油气分布规律,在受油源断裂控制的不同层位油气运聚空间及分布部位研究的基础上,通过油源断裂在下部储层内输导油气有利部位,确定下部盖层油气运聚空间分布部位;通过油源断裂在下部储层内输导油气有利部... 详细信息

为了研究含油气盆地油源断裂附近油气分布规律,在受油源断裂控制的不同层位油气运聚空间及分布部位研究的基础上,通过油源断裂在下部储层内输导油气有利部位,确定下部盖层油气运聚空间分布部位;通过油源断裂在下部储层内输导油气有利部位和下部区域性泥岩盖层渗漏部位,确定中部盖层油气运聚空间分布部位;通过油源断裂在下部储层内输导油气有利部位、下部和中部区域性泥岩盖层渗漏部位,确定上部盖层油气运聚空间分布部位;三者组合建立了一套受油源断裂控制的不同层位油气运聚空间分布部位的预测方法,并将其应用于渤海湾盆地歧口凹陷受港东断裂控制的不同层位油气运聚空间分布部位的预测。结果表明:除西南部端部外,其余部位皆为受港东断裂控制的沙三段源岩—沙一中亚段盖层油气运聚空间分布部位;受港东断裂控制的沙三段源岩—东二段盖层和沙三段源岩—明化镇组盖层油气运聚空间分布部位均在其中部,前者分布范围略大于后者。这些分布部位分别有利于下伏沙三段源岩生成的油气在港东断裂附近的沙一中亚段、东二段和明化镇组区域性泥岩盖层之下的储层中运聚成藏。该预测方法的预测结果与目前港东断裂附近沙一中亚段、东二段和明化镇组区域性泥岩盖层之下储层中已发现油气分布相吻合。

关键词：油源断裂油气运聚空间分布部位预测方法歧口凹陷

A Novel Design of a Pre-separation Panel Structure to Protect Against the Impact of an Explosion in an Aircraft Plenum Chamber

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2024年第1期37卷 166-180页

作者： Zongxing liu Xiang Yang Jun liu School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China COMAC Shanghai Aircraft Design and Research Institute Shanghai 201210China

To reduce the damage of the pressurizing panel structure of a fuselage caused by an explosion at the“least risk bomb location”in an aircraft structure,a new pre-separation panel structure was designed to resist blast ***,the dynamic strain response and morphology of impact damage of the new pre-separation panel were measured in an impact damage ***,the commercial software LS-DYNA was used to calculate the propagation of the blast shock wave,and the results were compared with empirical equations to verify the rationality of the numerical calculation ***,the fluid–structure coupling method was used to calculate the damage process of the pre-separation panel structure under the impact of an explosion wave and an impact *** calculated results were in good agreement with the test results,which showed the rationality of the calculation method and the *** residual strength of the damaged pre-separation panel was significantly higher than that of the original damaged *** results show that the new pre-separation panel structure is reasonable and has certain significance for guiding the design of plenum chambers with strong resistance to implosion for aircraft fuselages.

关键词： Pre-separation panel structure Explosive response Residual strength Aircraft plenum chamber Least risk bomb location

Effectiveness and safety of acupuncture in treatment of pregnancyrelated symptoms:a systematic review and Meta-analysis

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 Traditional Chinese Medicine 2024年第1期44卷 16-26页

作者： liu Tingting liu Tongou liu Mingfu School of Traditional Chinese Medicine Clinical Medicine Hubei University of Traditional Chinese MedicineWuhan 430000China First Clinical College of Hubei University of Traditional Chinese Medicine Wuhan 430000China Department of Acupuncture and Tuina Affiliated Hospital of Hubei University of Traditional Chinese MedicineHubei Provincial Hospital of Traditional Chinese MedicineWuhan 430000China

OBJECTIVE:To systematically evaluate the efficacy and safety of acupuncture(AM)in the treatment of pregnancyrelated symptoms such as acute vomiting during ***:We comprehensively searched the available literature up to November 2021,including Pub Med,Embase,Cochrane Library,Chinese Biomedical Literature Database,and China National Knowledge Infrastructure Database,for randomized controlled trials(RCTs)on AM for the treatment of severe vomiting,insomnia,pharyngeal and pelvic pain,mood abnormalities,and dyspepsia during ***:Sixteen RCTs with a cumulative sample size of 1178 cases were *** these,964 patients were included in the *** Meta-analysis results showed that AM was more efficient than Western medicine in treating discomfort during pregnancy[odds ratio(OR)=1.19,95%confidence interval(CI)(1.11,1.28),P<0.01].AM was better than the control group in improving the visual analog scale scores[standard mean difference(SMD)=0.62,95%CI(0.53,0.71),P<0.01].AM was superior to the control group in improving Numerical Rating Scale(NRS)symptom scores[OR=7.31,95%CI(3.36,15.94),P<0.01].There was no significant difference in adverse effects between the AM and sham-AM groups and the analgesic drug group[OR=0.70,95%CI(0.39,1.28),P=0.25],but the treatment and control groups had mild adverse effects with a low ***:AM is more effective than other treatments or pharmacotherapy alone in the treatment of pregnancy-related symptoms,and is relatively ***,the quality of the included trials was rather poor,and high-quality studies are required to confirm our findings.

关键词： acupuncture pregnancy nausea vomiting sleep initiation and maintenance disorders low back pain pelvic pain mood abnormalities Meta-analysis systematic review

在线全文

学校读者我要写书评

暂无评论

汉语作为第二语言的韵律边界声学特征的研究

华文教学与研究 2016年第3期 1-16,86页

作者：刘凤鸣陈默教育部人文社会科学重点研究基地北京语言大学对外汉语研究中心北京100083 北京语言大学汉语进修学院北京100083

韵律边界的声学特征是研究第二语言学习者韵律能力发展的重要维度。以第一语言为韩语的汉语学习者的朗读产出为研究对象,以汉语母语者朗读韵律的基线数据作为参照,考察语言水平和韵律边界等级对韩语母语者汉语朗读韵律边界的声学特征产... 详细信息

韵律边界的声学特征是研究第二语言学习者韵律能力发展的重要维度。以第一语言为韩语的汉语学习者的朗读产出为研究对象,以汉语母语者朗读韵律的基线数据作为参照,考察语言水平和韵律边界等级对韩语母语者汉语朗读韵律边界的声学特征产出的影响。研究结果表明:(1)韩语母语者在韵律边界处的各项声学特征的发展是不均衡的,边界前音节延长、低音点和低音点音高重置特征发展得最快,无声段时长特征发展得最慢。(2)不同语言水平的韩语母语者对于韵律边界声学特征层级关系的区分是不同的,这种能力的发展是动态的、非线性的:对于无声段时长特征来说,初、中、高级水平韩语母语者都已经习得了无声段在三个等级边界间的节奏关系;对于边界前延长特征来说,初级和高级汉语水平韩语母语者的表现较好,可以将韵律短语边界区分出来,不能区分韵律词和语调短语边界,中级汉语水平韩语母语者的表现较差,不能区分边界前延长在三个等级边界间的层级关系;对于低音点和低音点音高重置特征来说,初、中、高级水平韩语母语者都已经习得了低音点和低音点音高重置在三个等级边界间的层级关系。

关键词：第二语言习得朗读韵律边界无声段时长边界前音节延长音高重置