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

东北三省冰雪体育旅游高质量发展研究

体育文化导刊 2024年第8期 84-90页

作者：刘贝刘欢欢王国荣齐齐哈尔大学体育学院黑龙江齐齐哈尔161006 新疆师范大学体育学院乌鲁木齐830054 烟台科技学院图书馆山东烟台265600

运用文献资料、逻辑归纳等方法,审视东北三省冰雪体育旅游高质量发展的价值、困境,并提出发展路径。价值:公共设施拓宽旅游新场景,科技创新促进产业结构升级,协同发展新机制提升服务品质。困境:安全保障体系不健全,产品创新性不足,服务... 详细信息

运用文献资料、逻辑归纳等方法,审视东北三省冰雪体育旅游高质量发展的价值、困境,并提出发展路径。价值:公共设施拓宽旅游新场景,科技创新促进产业结构升级,协同发展新机制提升服务品质。困境:安全保障体系不健全,产品创新性不足,服务设施有待完备,人才缺口日益凸显。发展路径:完善安全保障体系,推动旅游平稳运行;创新产品设计,实现产品结构升级;优化服务设施,提升服务供给能力;培育壮大人才队伍,强化人才保障。

关键词：体育经济冰雪体育旅游东北三省高质量发展

在线全文

学校读者我要写书评

暂无评论

地热井钻井过程中漏失对井筒温度分布的影响

科学技术与工程 2024年第23期24卷 9819-9826页

作者：张政赵豫王国荣钟林王敬朋西南石油大学油气藏地质及开发工程国家重点实验室成都610500 西南石油大学能源装备研究院成都610500 西南石油大学机电工程学院成都610500

针对地热井钻井过程中经常发生的井漏现象,建立了预测井筒和周围地层温度分布二维瞬态温度模型。采用有限体积法对模型进行离散,使用欠松弛迭代法进行求解;通过与之前建立的井筒温度模型进行对比,验证了本文建立的模型的有效性,得到了... 详细信息

针对地热井钻井过程中经常发生的井漏现象,建立了预测井筒和周围地层温度分布二维瞬态温度模型。采用有限体积法对模型进行离散,使用欠松弛迭代法进行求解;通过与之前建立的井筒温度模型进行对比,验证了本文建立的模型的有效性,得到了地热井裸眼段发生漏失时井筒温度分布规律,分析了影响井筒温度分布的敏感性因素。研究表明,在发生漏失的位置,环空钻井液温度分布曲线发生了明显的突变。井筒内持续性的漏失现象会降低环空与钻杆内的钻井液循环温度,体现了井漏对钻井液的冷却作用,尤其对井底靠近漏失层位的部分井段效果更明显。在钻井液循环相同的时间后,漏失情况下的井口温度和井底温度明显低于正常循环情况下的井口温度和井底温度。裸眼地层段漏失的发生不仅对漏失点以上的井筒温度分布产生了重要影响,也显著影响了漏失点以下的井筒温度分布。

关键词：地热井漏失井筒温度瞬态传热模型敏感性因素分析

Quality of Irrigated Water with Nanometer Pottery Tray Treatment and Its Effects on Seed Soaking

在线全文

学校读者我要写书评

暂无评论

Rice science 2016年第2期23卷 88-95页

作者： HUANG Jun-rong wang Ai-juan wang guo-rong LIU Lian-meng HUANG Shi-wen China National Rice Research Institute Hangzhou 310006 China Zhejiang University Hangzhou 310007 China Master Station of Yuhang District of Hangzhou for Administrative Agroecology and Plant Protection Hangzhou 311100 China Agricultural Bureau of Xiaoshan District of Hangzhou Hangzhou 311201 China

To study the impacts of nanometer pottery trays （NPTs） on different rice varieties, three rice varieties, Zhongzheyou 1, Jinzao 47 and Xiushui 09, were treated with four NPTs （NPT-A, NPT-B, NPT-C and NPT-D） with different energies, respectively. The results showed that when the same rice variety was treated with different NPTs or different rice varieties were treated with the same NPT, the impacts on seed germination rate, seedling growth, plant height, panicle length and weight, the number of filled grains, seed-setting rate and 1000-grain weight varied between different rice variety-NPT interaction groups. In general, high energy NPT-C and NPT-D treatments obviously enhanced the functions of most examined rice characters. For example, NPT-C and NPT-D treatments improved the germination rate of all the three rice varieties, and promoted the root growth of seedlings, and increased seedling fresh weight, single panicle weight, filled grain number per panicle, seed-setting rate and 1000-grain weight. On the contrary, low energy NPT-A treatment restrained the seed germination rate in Jinzao 47 and Zhongzheyou 1, and decreased the seedling fresh weight in Zhongzheyou 1. NPT-B treatment restrained the seedling growth in Jinzao 47 but increased the panicle length of Zhongzheyou 1. NPT-A and NPT-C treatments obviously decreased the 1000-grain weight in Xiushui 09. Therefore, when treating crop seeds or plants using nanomaterials or nanotechnologies, different types of crops/varieties should select the nanomaterials or nanotechnologies with suitable energies to reduce the negative effects.

关键词： nanomaterial nanotechnology nanometer pottery tray seed soaking rice variety

4-Amino-1,2,4-triazole Resin-supported Palladium Complex as Phosphine-free Catalyst for Suzuki Reaction in Aqueous Phase

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2010年第2期26卷 331-334页

作者： WU Xiang-mei wang Yan guo Sheng-rong College of Chemistry and Life Science Lishui University Lishui 323000 P. R. China

1 Introduction The Suzuki cross-coupling reaction is a powerful and versatile method for the generation of unsymmetrical biaryls from arylboronic acids and aryl halides in a single step. However, the reaction is usually performed in the presence of Pd catalyst along with phosphine ligand, which sometimes creates practical problems because organophosphines tend to be expensive, poisonous, and air sensitive. Recently, phos-phine-free ligands,

关键词： Suzuki reaction Phosphine-free ligand Palladium 4-Amino-1,2,4-triazole resin

Fasudil-modified macrophages reduce inflammation and regulate the immune response in experimental autoimmune encephalomyelitis

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第3期19卷 671-679页

作者： Chunyun Liu Shangde guo rong Liu Minfang guo Qing wang Zhi Chai Baoguo Xiao Cungen Ma Institute of Brain Science Shanxi Datong UniversityDatongShanxi ProvinceChina The Key Research Laboratory of Benefiting Qi for Acting Blood Cireulation Method to Treat Multiple Sclerosis of State Administration of Traditional Chinese Medicine/Research Center of Neurobiology Shanxi University of Chinese MedicineTaiyuanShanxi ProvinceChina Institute of Neurology Huashan HospitalInstitutes of Brain Science and State Key Laboratory of Medical NeurobiologyFudan UniversityShanghaiChina

Multiple sclerosis is characterized by demyelination and neuronal loss caused by inflammatory cell activation and infiltration into the central nervous *** polarization plays an important role in the pathogenesis of experimental autoimmune encephalomyelitis,a traditional experimental model of multiple *** study investigated the effect of Fasudil on macrophages and examined the therapeutic potential of Fasudil-modified macrophages in experimental autoimmune *** found that Fasudil induced the conversion of macrophages from the pro-inflammatory M1 type to the anti-inflammatory M2 type,as shown by reduced expression of inducible nitric oxide synthase/nitric oxide,interleukin-12,and CD16/32 and increased expression of arginase-1,interleukin-10,CD14,and CD206,which was linked to inhibition of Rho kinase activity,decreased expression of toll-like receptors,nuclear factor-κB,and components of the mitogen-activated protein kinase signaling pathway,and generation of the pro-inflammatory cytokines tumor necrosis factor-α,interleukin-1β,and ***,Fasudil-modified macrophages effectively decreased the impact of experimental autoimmune encephalomyelitis,resulting in later onset of disease,lower symptom scores,less weight loss,and reduced demyelination compared with unmodified *** addition,Fasudil-modified macrophages decreased interleukin-17 expression on CD4^(+)T cells and CD16/32,inducible nitric oxide synthase,and interleukin-12 expression on F4/80^(+)macrophages,as well as increasing interleukin-10 expression on CD4^(+)T cells and arginase-1,CD206,and interleukin-10 expression on F4/80^(+)macrophages,which improved immune regulation and reduced *** findings suggest that Fasudil-modified macrophages may help treat experimental autoimmune encephalomyelitis by inducing M2 macrophage polarization and inhibiting the inflammatory response,thereby providing new insight into cell immunotherapy for m

关键词： anti-inflammatory experimental autoimmune encephalomyelitis Fasudil macrophage multiple sclerosis pro-inflammatory Rho kinase

A multifunctional shear apparatus for rocks subjected to true triaxial stress and high temperature in real-time

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3524-3543页

作者： Jun Zhao Xia-Ting Feng Jia-rong wang Liang Hu Yue guo Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110819China Key Laboratory of Liaoning Province on Deep Engineering and Intelligent Technology Northeastern UniversityShenyang110819China

Deep engineering disasters,such as rockbursts and collapses,are more related to the shear slip of rock joints.A novel multifunctional device was developed to study the shear failure mechanism in *** this device,the complete shearedeformation process and long-term shear creep tests could be performed on rocks under constant normal stiffness(CNS)or constant normal loading(CNL)conditions in real-time at high temperature and true-triaxial *** the research and development process,five key technologies were successfully broken through:(1)the ability to perform true-triaxial compressioneshear loading tests on rock samples with high stiffness;(2)a shear box with ultra-low friction throughout the entire stress space of the rock sample during loading;(3)a control system capable of maintaining high stress for a long time and responding rapidly to the brittle fracture of a rock sample as well;(4)a refined ability to measure the volumetric deformation of rock samples subjected to true triaxial shearing;and(5)a heating system capable of maintaining uniform heating of the rock sample over a long *** developing these technologies,loading under high true triaxial stress conditions was *** apparatus has a maximum normal stiffness of 1000 GPa/m and a maximum operating temperature of 300*** differences in the surface temperature of the sample are constant to within5*** types of true triaxial shear tests were conducted on homogeneous sandstone to verify that the apparatus has good performance and *** results show that temperature,lateral stress,normal stress and time influence the shear deformation,failure mode and strength of the *** novel apparatus can be reliably used to conduct true-triaxial shear tests on rocks subjected to high temperatures and stress.

关键词： True-triaxial shear apparatus Rocks Complete shear stressedeformation process Creep Real-time high-temperature

Comparative analysis of the characteristics of outlet short circuit and winding insulation fault of distribution transformer and its preventive measures

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

HIGH VOLTAGE 2024年第3期9卷 700-709页

作者： Xian, Richang Hu, Yuyao Zhang, Bingqian rong, Qingyu Zhao, Rujie wang, Wei guo, Yang Li, Yunhao Shandong Univ Technol Coll Elect & Elect Engn Zibo Peoples R China Shandong Univ Technol Coll Elect & Elect Engn Zibo 255000 Peoples R China State Grid China Technol Coll Jinan Peoples R China Shandong Huineng Elect Co Ltd Zibo Peoples R China

Outlet short circuit on the low-voltage (LV) side and winding inter-turn short circuit faults are hazardous to transformer operation. To investigate the formation mechanism of winding insulation faults of distribution transformer, ANSYS Maxwell was used to build a coupled magnetic field-circuit model with the same structural dimension as the actual distribution transformer. An outlet short circuit and winding inter-turn insulation faults were set by using the voltage-controlled switch in the external circuit of the model. Subsequently, the differences in the electromagnetic characteristics and the electrodynamic force distributions of the windings under three operating conditions, namely, nominal load, three-phase outlet short circuit on the LV side and inter-turn insulation failure were studied, respectively. The results show that compared with the rated load, in the cases of outlet short circuit and inter-turn insulation faults, the amplitude of winding current increases by 20 and 50 times, the magnetic field strength grows by 20 and 17 times, and the electrodynamic force rises by 400 and 230 times, respectively. Outlet short circuit fault is more likely to cause the winding instability and deformation, and inter-turn short circuit fault can easily burn out winding insulation. Therefore, corresponding preventive measures were proposed.

关键词： transformer windings fault diagnosis external circuit short-circuit currents winding insulation fault Finite element analysis electrodynamics inter-turn insulation failure actual distribution transformer power transformer insulation inter-turn short circuit fault winding inter-turn insulation faults magnetic fields outlet short circuit fault Transformers and reactors three-phase outlet short circuit coupled magnetic field-circuit model

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

微弱电流的测量与I/F变换电路的设计

核电子学与探测技术 2005年第4期25卷 358-362页

作者：王国荣黑龙江大学物理科学与技术学院黑龙江哈尔滨150080

介绍了反馈式电流放大器型I/V转换和V/F变换电路的设计,详细讨论了减少噪声干扰的措施。可以测量10-11～10-6A的弱电流。

关键词：弱电流 I/F变换器反馈电阻噪声

Protein crystallization with DNA templates

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第3期86卷 262-268页

作者： Bo Zhang Jia Yu Zhe Pu Wenhui guo Ruoqi Yang Yu Wen Zhijiang rong Hui wang Xiaoli Wu Bo wang Hongyan Sun School of Environment and Resources Taiyuan University of Science and TechnologyTaiyuan030024China School of Chemical Engineering and Technology Taiyuan University of Science and TechnologyTaiyuan030024China

Protein crystallization plays a significant role in three-dimensional structural analysis and protein *** is important to increase the crystallization efficiency,which is possible by adding hetero-geneous templates in crystallization *** is biologically compatible and artificially designable polymer,which is easy to *** this study,single-and double-stranded DNA of precise sequences were designed and used as templates to promote protein crystallization of lysozyme and ***-fluence of DNA,single-stranded DNA with 10,20,40 bases and double-stranded DNA with 10,20,40 base pairs,were *** success rate of obtaining crystals of lysozyme and catalase in equal period was significantly improved with the addition of DNA comparing without templates ***-stranded DNA led to higher nucleation rate than that with single-stranded *** promotion of nucleation was more obvious at low concentration of protein solution and with longer chain DNA *** number and crystallization rate was enhanced with addition of long double-stranded DNA *** the results confirm that DNA is an effective polymer additive to enhance protein crystallization,especially for the application of the scarce protein crystallization.

关键词： DNA Polymer Additive Protein Crystallization