检索结果-南通市图书馆

International Journal of Ophthalmology(english edition) 2022年第3期15卷 413-419页

作者： bo Yu Yun-Hai Tu Guang-Ming Zhou Jie-Liang Shi en-De wu Wen-Can wu Department of Orbital and Oculoplastic Surgery Eye Hospital of Wenzhou Medical UniversityWenzhou 325027Zhejiang ProvinceChina

AIM: To demonstrate the outcomes of endoscopic endonasal dacryocystorhinostomy(en-DCR) with an novel lacrimal ostium stent(LOS) which was performed in patients with recurrent epiphora after failed external dacryocystorhinostomy(Ex-DCR) and analyze the causes of failed ***: From September 2015 and December 2017, the clinic data of 29 cases suffered from recurrent epiphora after failed Ex-DCR was *** LOS were implanted into the ostium at the end of the revisional *** causes of failed Ex-DCR were analyzed before revisional *** of revisional surgeries with the new device were evaluated as ***: The major causes of failure of the external approach were synechiae formation in the nasal ostium(29/29), followed by inadequate removal of the bony wall(21/29), nasal synechiae formation between lateral wall of nose and middle turbinate(11/29), and the bone opening was not in good location(7/29).The rate of success after revisional surgery was 82.76%.Re-obstruction of the ostiums were found in 5 failed ***: endoscopic approach with a novel LOS may be an effective procedure to manage recurrent epiphora after previous failed Ex-DCR *** formation in the nasal ostium and inadequate removal of the bony wall were the major causes of failure of Ex-DCR.

关键词： external dacryocystorhinostomy failed endoscopic technique lacrimal ostium stent

Characteristics of Oxidation and Oxygen Penetration of Alloy 690 in 600°C Aerated Supercritical Water

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 Materials Science & Technology 2018年第3期34卷 561-569页

作者： Xiangyu Zhong Xinqiang wu en-Hou Han CAS Key Laboratory of Nuclear Materials and Safety Assessment Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The oxide films formed on Alloy 690 exposed to 600 ℃ supercritical water were characterized using mass measurement, X-ray diffraction. Raman spectroscopy, scanning electron microscopy equipped with energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. It was found that the mass gain of the alloy in supercritical water decreased with increasing exposure time. The oxide films have a double-layer structure, with an inner layer rich in Cr and outer layer rich in Ni and Fe after short time and long time exposure. The penetration of the oxide along the grain boundaries was observed, and the penetration depth increased with increasing exposure time. The grain boundaries and voids are the short-path of oxygen diffusion into the metal.

关键词： Ni-based alloy XPS Supercritical water High temperature corrosion High temperature oxidation Oxide film

A new extended structural compound based on saturated Wells-Dawson polyoxoanions

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2009年第11期20卷 1381-1385页

作者： Min Xu Jia Liu en bo Wang Key Laboratory of Polyoxometalate Science of Ministry of Education Institute of Polyoxometalate Chemistry Department of Chemistry Northeast Normal University Changchun Jilin 130024 China Department of Chemistry Tonghua Normal University Tonghua Jilin 134002 China

A new 3D extended structural compound, （dpdo）2H2{[Cu（2,2＇-bipy）212（P2W18O62）}.SH2O 1 （dpdo = 4,4＇-bipyridine-N,N＇- dioxide; 2,2＇-bipy = 2,2＇-bipyridine）, has been hydrothermally synthesized and characterized by elemental analyses, IR, TG analyses, cyclic voltammetry, and single-crystal X-my diffraction. Compound 1 is built up of [P2WlsO62]6- cluster as the structural motif covalently linked by [Cu（2,2＇-bipy）2]^2＋ coordination complexes to yield the 1D chains, which axe further in close contact forming a 3D supramolecular framework via aromatic π-π stacking interactions and extensive hydrogen-bonding interactions among polyoxoanions, coordinated 2,2＇-bipy organic ligands, free dpdo organic molecules and lattice water molecules.

关键词： 3D extended structures Dawson-type polyoxometalates Copper-organic complexes

Toxicological and biochemical characterizations of malathion sensitivity in two field populations of Oxya chinensis （Orthoptera： Acridoidea）

在线全文

学校读者我要写书评

暂无评论

Insect Science 2006年第1期13卷 41-47页

作者： MEI-LING YANG HAI-HUA wu YA-PING GUO en-bo MA College of Life Science and Technology Shanxi University Taiyuan China

We evaluate comparative toxicity of malathion in the two populations of the grasshopper Oxya chinensis, collected from Daixian and Fanshi of Shanxi province, China. General esterases and acetylcholinesterase （ACHE） from the two populations were characterized and compared. LD50 of the Daixian population （7.58 μg/g body weight） was 2.02-fold higher than that of the Fanshi population （3.75μg/g body weight）. General esterase-specific activities in the Daixian population were 1.91,130 and 1.85-fold higher than those in the Fanshi population, when α-NA, α-NB and β-NA were used as a substrate, respectively. Kinetic studies of general esterase showed that Vmax values of general esterases hydrolyzing α-NA,α-NB and β-NA in the Daixian population were 2.15-, 1.12-, and 1.47-fold, respectively, higher than those in the Fanshi population. The AChE activity of the Fanshi population was 1.54-fold higher than that of the Daixian population. Kinetic analysis of AChE showed that significant differences were presented between the two populations in the Km values; and the Vmax value in the Fanshi population was higher than that in the Daixian population. Inhibition studies of AChE indicated that AChE from the Daixian population was 2.56-, 2.80-, and 2.29-fold less sensitive to inhibition by paraoxon, chlorpyrifos-oxon, and demeton-S-methyl, respectively, than that from the Fanshi population. These biochemical characterizations of general esterases and AChE were consistent with malathion bioassay in the two populations. It is inferred that the reduced sensitivity of altered AChE and increased general esterase activities play an important role in the differences of insusceptibility of Oxya chinensis to malathion between the two populations.

关键词： acetylcholinesterase general esterases malathion susceptibility Oxya chinensis

Multi-scale analysis of void evolution in large-section plastic mold steel during multi-directional forging

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 Iron and Steel Research International 2022年第12期29卷 1961-1977页

作者： Xuan Chen bo-ya wu bo-liang wu Xiao-chun wu Jun-wan Li School of Materials Science and engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The void evolution of large-section plastic mold steel during multi-directional forging(MDF)was investigated using multiscale *** simulate the forging process of the plastic mold steel(SDP1 steel)and realize micro-void reconstruction in a representative volume element(RVE),MDF experiment and void-characteristic evaluation of the SDP1 steel were carried *** upsetting and stretching forging(TUSF)and MDF were simulated to comparatively analyze the evolution of temperature,effective stress,and effective *** embedding RVE with a micro-void and using boundary condition by point tracking into the forging process,the single-void evolution in TUSF and MDF was *** effect of void orientation on single-void evolution was also *** multi-scale analysis revealed the following results.(1)Compared with TUSF,MDF achieved a higher efficiency in void closure.(2)The closing efficiency of the void increased with the increase in angle h(the angle between the Z and long axes of the void).(3)The closing efficiency increased with the increase in the orientation angle during the forging *** the basis of the important role of the main stress in each forging step on the void closure,an integral formula of the main stress was *** main compressive-stress integration reached-0.4,the closed state of the void could be accurately determined.

关键词： Plastic mold steel Multi-directional forging Multi-scale analysis Representative volume element Void

Diurnal and seasonal variation of glacier meltwater hydrochemistry in Qiyi glacierized catchment in Qilian Mountains, Northwest China: implication for chemical weathering

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 Mountain Science 2018年第5期15卷 1035-1045页

作者： wu Xiao-bo State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences

In glacierized catchments, glacier runoff typically shows a strong diurnal cycle in the ablation season(June-September). To elucidate the effect of these processes on the chemical weathering, fresh snowfall and water samples were collected and studied from the supraglacial river, proglacial river,and gauging site in Qiyi glacierized catchment Qilian Mountains, Northwestern China, in the summer of2011. The pH and electronic conductivity(EC) were determined in the field, and the concentrations of major ions(Na^+, K^+, Mg^(2+), Ca^(2+), Cl^-, SO_4^(2-), NO_3^-) were measured. The results indicated that EC linearly increased with increasing distance from the glacial snout, and the concentrations of major ions increased with increasing water-rock interaction time. Along the flow path of the glacier runoff, Na^+ and Cl^-are more concentrated than other ions in the supraglacial river while Mg^(2+) and SO_4^(2-)are more concentrated than other ions at the gauging site. The discharge, pH, EC,and the concentrations of major ions exhibited significant diurnal variation along the flow path. On the other hand, the amplitude of variation diminished from upstream to downstream along the flow *** chemical weathering rate(Na^++K^++Mg^(2+)+Ca^(2+))was determined to be 10.9 t/yr/km^2. Moreover,further research indicated that the sampling method influenced the assessment of chemical weathering rates. When the sample was collected randomly in one diurnal cycle of hydrography, the estimated ionic flux could deviate-47%~73% based on estimated hourly data. In contrast, if three samples were collected at peak, base flow and the discharge decreasing rate starts to slow down in one diurnal cycle of hydrography, respectively, the deviation would be less than 15%. The smaller the diurnal variation of discharge, the smaller deviation calculated.

关键词： Diurnal variation Hydrochemistry Chemical weathering rate

在线全文

学校读者我要写书评

暂无评论

榆家梁薄煤层超长运距刮板输送技术研究

煤炭技术 2025年第1期44卷 278-282页

作者：吴波崔卫秀国能神东煤炭集团有限责任公司陕西神木719315 中煤张家口煤矿机械有限责任公司河北张家口076250 河北省高端智能矿山装备技术创新中心河北张家口076250

为解决神东榆家梁煤矿1.4 m煤层、350 m宽工作面煤炭开采的运输问题,制定了薄煤层超长工作面成套设备总体配套方案,在对装机功率及链条安全系数进行验算的基础上,确定了刮板输送设备主要技术参数;开发了φ38/86×137宽带链及链传动系统... 详细信息

为解决神东榆家梁煤矿1.4 m煤层、350 m宽工作面煤炭开采的运输问题,制定了薄煤层超长工作面成套设备总体配套方案,在对装机功率及链条安全系数进行验算的基础上,确定了刮板输送设备主要技术参数;开发了φ38/86×137宽带链及链传动系统、薄煤层极矮中部槽、下沉式可伸缩机尾、定距端卸一体式机头推移部,满足了薄煤层大功率设备对配套空间的需求;优化了伸缩机尾自动张紧控制流程,配置了刮板输送机智能控制系统,为工作面运输设备无人化管理提供了技术保障。经过井下工业性实践证明,设备使用良好,该工作面已成为薄煤层智能开采的示范工程。

关键词：薄煤层刮板输送设备极矮中部槽自动伸缩机尾智能控制

BV Structure on Hochschild Cohomology of Quantum Exterior Algebra with Two Variables

在线全文

学校读者我要写书评

暂无评论

Algebra Colloquium 2023年第2期30卷 205-224页

作者： bo Hou Jinzhong wu School of Mathematics and Statistics Henan University KaifengHenan 475001China

Let Ag=k(x,y)/(x^(2),xy+qyx,y^(2))over a field *** give a clear character-ization of the Batalin-Vilkovisky algebraic structure on Hochschild cohomology of A_(q)for any q≠O,and the Gerstenhaber algebraic structure on... 详细信息

关键词： Batalin-Vilkovisky structure quantum exterior algebra Hochschild cohomology

Characteristics of Halloween genes and RNA interference-mediated functional analysis of LmCYP307a2 in Locusta migratoria

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2022年第1期29卷 51-64页

作者： Xue-Yao Zhang Qi-Hui He Ting-Ting Zhang Hai-Hua wu Jian-Zhen Zhang en-bo Ma Research Institute of Applied Biology Shanxi UniversityTaiyuanShanxi030006China

Halloween genes are involved in the biosynthesis of the molting hormone, which plays a key role in insect ecdysis, development, metamorphosis, and reproduction. Our previous work identified five Halloween genes from Locusta migratoria, but their functions are currently unknown. In this study, the sequences of these five Halloween genes were analyzed and characterized. LmCYP307a2, LmCYP306a1, LmCYP302a1, and LmCYP315a1 were primarily expressed in the prothoracic glands, while LmCYP314a1 was universally expressed in peripheral tissues, especially in the ovaries and Malpighian tubules. All five Halloween genes were mainly expressed from the 5th to the 7th d in 5th-instar nymphs. RNA interference (RNAi) silencing of LmCYP307a2 resulted in severe molting delays and molting failure, which could be rescued by supplementary 20-hydroxyecdysone. A hematoxylin and eosin staining analysis suggested that the RNAi of LmCYP307a2 inhibited the ecdysis process by inhibiting the apolysis and degradation of the old cuticle, and by promoting the synthesis of a new cuticle. Quantitative reverse transcription polymerase chain reaction results showed that the expressions of LmE74, LmCht5, and LmCht10 were dramatically down-regulated, while that of LmChsI was substantially up-regulated, after knockdown of LmCYP307a2. The results suggest that LmCYP307a2 is related to the molt process via regulation of chitin synthesis and degradation.

关键词： Halloween genes Locusta migratoria RNAi silencing Spookier

基于密度泛函理论研究Co、Ni、As掺杂载金黄铁矿的电子结构和稳定性

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第1期42卷 145-155页

作者：吴德宝唐云李国辉吴波聂光华贵州大学矿业学院贵阳550025 贵州省非金属矿产资源综合利用重点试验室贵阳550025 紫金矿业集团股份有限公司龙岩364000

Co、Ni、As掺杂的黄铁矿晶体具有不同物理性质,会影响其载金性能和氧化行为.论文基于密度泛函理论计算,采用了CASTEP软件对载金黄铁矿以及不同晶体缺陷的载金黄铁矿进行模拟计算,以研究Co、Ni、As掺杂载金黄铁矿的电子结构,并据此分析... 详细信息

Co、Ni、As掺杂的黄铁矿晶体具有不同物理性质,会影响其载金性能和氧化行为.论文基于密度泛函理论计算,采用了CASTEP软件对载金黄铁矿以及不同晶体缺陷的载金黄铁矿进行模拟计算,以研究Co、Ni、As掺杂载金黄铁矿的电子结构,并据此分析其稳定性.综合半导体类型和能量分析,不同晶体缺陷的载金黄铁矿稳定性顺序为:Fe_(32)S_(63)AsAu

关键词：载金黄铁矿掺杂密度泛函理论氧化预处理

维普期刊数据库博看期刊