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International Journal of Ophthalmology(English edition) 2024年第4期17卷 761-766页

作者： Su-Lan Wu Yi-Qi Chen Li-Jun Shen jian-Bo Mao Li Lin Ji-Wei Tao Huan Chen Shi-An Zhang jia-feng yu Chen-Xi Wang Center for Rehabilitation Medicine Department of OphthalmologyZhejiang Provincial People’s HospitalAffiliated People’s HospitalHangzhou Medical CollegeHangzhou 310000Zhejiang ProvinceChina The Affiliated Eye Hospital of Wenzhou Medical University in Hangzhou Hangzhou 310000Zhejiang ProvinceChina

AIM:To evaluate scleral buckling(SB)surgery using a noncontact wide-field viewing system and 23-gauge intraocular illumination for the treatment of rhegmatogenous retinal detachment in silicone oil(SO)-filled ***:Totally 9 patients(9 eyes)with retinal detachment in SO-filled eyes were retrospectively *** patients underwent non-contact wide-field viewing system-assisted buckling surgery with 23-gauge intraocular *** was removed at an appropriate time based on *** patients were followed up for at least 3mo after SO *** reattachment,complications,visual acuity and intraocular pressure(IOP)before and after surgery were ***:Patients were followed up for a mean of 8.22mo(3-22mo)after SO *** patients had retinal *** the final follow-up,visual acuity showed improvement for 8 patients,and no change for 1 *** IOP was high in 3 patients before surgery,but it stabilized after treatment;it was not affected in the other *** of the patients had infections,hemorrhage,anterior ischemia,or any other ***:This new non-contact wide-field viewing system-assisted SB surgery with 23-gauge intraocular illumination is effective and safe for retinal detachment in SO-filled eyes.

关键词： non-contact wide-field viewing system scleral buckling silicone oil-filled retinal detachment

选择性催化氧化H_(2)S的富氮碳催化剂研究进展

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中国环境科学 2024年第4期44卷 1981-1994页

作者：杨金涛杨学金宁平王访宋晓双贾丽娟冯嘉予云南民族大学化学与环境学院云南昆明650504 昆明理工大学环境科学与工程学院云南昆明650504

近年来,能高效净化H_(2)S并回收硫资源的选择性催化氧化技术(H_(2)S-SCO)受到了广泛关注.开发高性能、高选择性及低成本的催化剂是H_(2)S-SCO技术的研究重点,其中富氮碳基催化剂(RNCC)具有高活性、无金属、易制备、低成本且易再生等优点... 详细信息

近年来,能高效净化H_(2)S并回收硫资源的选择性催化氧化技术(H_(2)S-SCO)受到了广泛关注.开发高性能、高选择性及低成本的催化剂是H_(2)S-SCO技术的研究重点,其中富氮碳基催化剂(RNCC)具有高活性、无金属、易制备、低成本且易再生等优点,被认为是一类极具潜力的H_(2)S-SCO催化剂.本文介绍了金属基催化剂的发展,总结和归纳RNCC的制备方法、催化活性和物化性质,系统地讨论RNCC的构-效关系及影响RNCC性能的关键因素,并总结了RNCC的H_(2)S-SCO反应机理.最后指出RNCC目前存在机遇和挑战,并展望了未来的发展方向.

关键词：富氮碳基催化剂 H_(2)S 选择性催化氧化

基于AIXM数据集和改进A^(*)算法的直升机路径规划

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科学技术与工程 2024年第14期24卷 6099-6107页

作者：赖欣梁昌盛张恒嫣冯嘉宇中国民用航空飞行学院空中交通管理学院广汉618307 中航材导航技术(北京)有限公司北京101300

针对AIXM数据集(aeronautical information exchange model dataset)在通航应用研究缺乏,以及经典A^(*)算法在直升机路径规划问题中转弯节点多等问题,提出了一种基于AIXM数据集的改进A^(*)算法直升机路径规划方法。首先,分析了AIXM数据... 详细信息

针对AIXM数据集(aeronautical information exchange model dataset)在通航应用研究缺乏,以及经典A^(*)算法在直升机路径规划问题中转弯节点多等问题,提出了一种基于AIXM数据集的改进A^(*)算法直升机路径规划方法。首先,分析了AIXM数据集的时空属性,设计了基于时空属性搜索的AIXM障碍物数据查询方法,为进行直升机路径规划奠定了数据环境基础;然后结合直升机性能限制构建了碰撞判断包围盒,基于碰撞包围盒改进经典A^(*)算法,利用AIXM数据障碍物数据与航线数据,提出了一种直升机路径规划方法;通过python与Luaid AIXM 5 Viewer对该方法进行了仿真实验表明,所提方法规划的直升机路径转弯节点少,降低了直升机转弯的频率,规划路径短且符合路径与障碍物之间的安全距离要求。本文研究是将AIXM数据集利用于通航航空情报服务的创新尝试。

关键词：通用航空 AIXM数据集直升机路径规划时空数据集 A^(*)算法

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模块式三维加筋土桥台变形特性载荷试验

中国公路学报 2024年第8期37卷 147-157页

作者：朱晨蔡晓光李雨润李思汉黄鑫冯加煜河北工业大学土木与交通学院中国地震灾害防御中心防灾科技学院地质工程学院北京防灾科技有限公司

三维加筋土桥台因前墙宽度有限，上部荷载作用下前墙与翼墙均会发生变形，仅在平面应变条件下讨论其变形特性显然与实际工程情况不符。为此，以实际桥台为原形，开展大比例尺载荷模型试验，研究三维条件下加筋土桥台顶部沉降、面板水平... 详细信息

三维加筋土桥台因前墙宽度有限，上部荷载作用下前墙与翼墙均会发生变形，仅在平面应变条件下讨论其变形特性显然与实际工程情况不符。为此，以实际桥台为原形，开展大比例尺载荷模型试验，研究三维条件下加筋土桥台顶部沉降、面板水平位移、土体水平位移和筋材应变规律，并将试验结果与现有计算方法结果进行对比分析。结果表明：顶部沉降值随荷载增加而近似线性增大，最大沉降发生在桥座处；桥台在使用极限状态(100 kPa荷载)下的沉降值小于1%H(H为桥台下部结构高度),联邦公路管理局规范中使用极限承载力设计相对保守；桥台前、翼墙的最大面板水平位移均出现在桥台中上部，变形规律基本一致；考虑三维效应的变形修正方法计算结果与实测结果具有较好的一致性；顺桥向筋材应变最大值为1.31%(600 kPa下),潜在破裂面为双折线形；横桥向筋材最大应变都发生在桥座下，在同一高度下整体沿横桥向呈现中间大并向两侧衰减的变化特征；实测筋材拉力最大值与刚度法计算值具有很好的一致性。

关键词：桥梁工程土工合成材料载荷试验加筋土桥台变形三维条件

Groupoids,Discrete Mechanics,and Discrete Variation

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Communications in Theoretical Physics 2008年第9期50卷 545-550页

作者： GUO jia-feng jia Xiao-yu WU Ke ZHAO Wei-Zhong School of Mathematical Science Capital Normal University Beijing 100037 China

After introducing some of the basic definitions and results from the theory of groupoid and Lie algebroid,we investigate the discrete Lagrangian mechanics from the viewpoint of groupoid theory and give the connection ... 详细信息

关键词： groupoids Lie algebroids discrete field discrete variational principle

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改性瓦斯灰干法脱除NO的实验研究

现代化工 2024年第4期44卷 112-115,121页

作者：庞崇靖张运瀚冯嘉予夏福婷马林转贾丽娟云南民族大学化学与环境学院云南省高校民族地区资源清洁转化重点实验室民族地区矿产资源综合利用重点实验室云南省教育厅环境功能材料重点实验室云南昆明650504

用不同碱改性固体废物瓦斯灰制备出一种能够脱除烟气中NO的催化剂。考察了浸渍浓度、固液比、超声时间等制备条件对瓦斯灰脱硝性能的影响,并对材料进行了XRF、XRD、SEM、EDS-Mapping、FT-IR表征。结果表明,利用KOH改性的瓦斯灰脱硝性能... 详细信息

用不同碱改性固体废物瓦斯灰制备出一种能够脱除烟气中NO的催化剂。考察了浸渍浓度、固液比、超声时间等制备条件对瓦斯灰脱硝性能的影响,并对材料进行了XRF、XRD、SEM、EDS-Mapping、FT-IR表征。结果表明,利用KOH改性的瓦斯灰脱硝性能最佳,在KOH浓度为2 mol/L、固液比为1∶2、超声时间为40 min的最佳制备条件下脱硝率约达100%。改性后,K成功负载在材料表面,瓦斯灰微观结构发生了变化,生成的新物质为NO的去除提供了更多活性位点。

关键词：干法瓦斯灰 NO 资源化利用

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水平地震作用下双级加筋土挡墙损伤识别研究

振动工程学报 2024年第8期37卷 1423-1430页

作者：李思汉蔡晓光徐洪路景立平黄鑫冯加煜防灾科技学院地质工程学院河北三河065201 河北省地震灾害防御与风险评价重点实验室河北三河065201 中国地震局建筑物破坏机理与防御重点实验室河北三河065201 中国地震局工程力学研究所地震工程与工程振动重点实验室黑龙江哈尔滨150080

因对台阶式加筋土挡墙损伤识别的研究不足,开展了双级加筋土挡墙的大型振动台试验。采用时域识别方法分析了水平地震作用下模型的动力响应特征,阐述了上、下级挡墙自振频率、阻尼比的分布规律,探究了结构损伤程度与自振频率、阻尼比间... 详细信息

因对台阶式加筋土挡墙损伤识别的研究不足,开展了双级加筋土挡墙的大型振动台试验。采用时域识别方法分析了水平地震作用下模型的动力响应特征,阐述了上、下级挡墙自振频率、阻尼比的分布规律,探究了结构损伤程度与自振频率、阻尼比间的对应关系。研究结果表明:加载前上、下级挡墙的自振频率基本一致,阻尼比随墙高的增加而减小;随着加载工况的累积,自振频率逐渐减小,阻尼比逐渐增大。采用数学方法对自振频率和阻尼比分布曲线进行多项式拟合,对比分析可得:当自振频率减小0~15.41%、阻尼比增大0~299.35%时,结构处于基本完好阶段;当自振频率减小15.41%~18.92%、阻尼比增大299.35%~360.07%时,结构处于轻微破坏阶段;当自振频率减小18.92%~21.29%、阻尼比增大360.07%~398.21%时,结构处于中等破坏阶段;当自振频率减小21.29%~29.60%、阻尼比增大398.21%~532.99%时,结构处于毁坏状态。

关键词：双级加筋土挡墙损伤识别振动台试验时域识别方法阻尼比

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Structure-based simulations complemented by conventional all-atom simulations to provide new insights into the folding dynamics of human telomeric G-quadruplex

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Chinese Physics B 2021年第7期30卷 646-654页

作者： yun-Qiang Bian feng Song Zan-Xia Cao jia-feng yu Ji-Hua Wang Shandong Key Laboratory of Biophysics Institute of BiophysicsDezhou UniversityDezhou 253023China

The hybrid atomistic structure-based model has been validated to be effective in investigation of G-quadruplex *** this study,we performed large-scale conventional all-atom simulations to complement the folding mechanism of human telomeric sequence Htel24 revealed by a multi-basin hybrid atomistic structure-based ***,the real time-scale of folding rate,which cannot be obtained from the structure-based simulations,was estimated directly by constructing a Markov state *** results show that Htel24 may fold as fast as on the order of milliseconds when only considering the competition between the hybrid-1 and hybrid-2 G-quadruplex ***,in comparison with the results of structure-based simulations,more metastable states were identified to participate in the formation of hybrid-1 and hybrid-2 *** findings suggest that coupling the hybrid atomistic structure-based model and the conventional all-atom model can provide more insights into the folding dynamics of DNA *** a result,the multiscale computational framework adopted in this study may be useful to study complex processes of biomolecules involving large conformational changes.

关键词： molecular dynamics simulation structure-based model all-atom model DNA G-quadruplex

Treatment strategies for mass burn casualties

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Chinese Medical Journal 2009年第5期122卷 525-529页

作者： CHAI jia-ke SHENG Zhi-yong YANG Hong-ming HAO Dai-feng SHEN Chuan-an jia Xiao-ming LI feng JING Sa LI Li-gen SONG Hui-feng jia Chi-yu TUO Xiao-ye SUN Tian-jun HU Quan Department of Burns and Plastic Surgery Burns Institute First Affiliated Hospital of General Hospital of PLA Beijing 100048 China

Background Mass burn casualties are always a great challenge to a medical team because a large number of seriously injured patients were sent in within a short time. Usually a high mortality is impending. Experiences gained from successful treatment of the victims may be useful in guiding the care of mass casualties in an armed conflict. Methods Thirty-five burn victims in a single batch, being transferred nonstop by air and highway from a distant province were admitted 48 hours post-injury. All patients were male with a mean age of （22.4±8.7） years. The burn extent ranged from 4% to 75% （（13.6±12.9）%） total body surface area. Among them, thirty-two patients were complicated by moderate and severe inhalation injury, and tracheostomy had been performed in 15 patients. Decompression incisions of burn eschar on extremities were done in 17 cases before transportation. All the thirty-five patients arrived at the destination smoothly via 4-hour airlift and road transportation. Among them, twenty-five patients were in critical condition. Results These thirty-five patients were evacuated 6 hours from the scene of the injury, and they were transferred to a local hospital for primary emergency care. The patients were in very poor condition when admitted to our hospital because of the severe injury with delayed and inadequate treatment. Examination of these patients at admission showed that one patient was suffering from sepsis and multiple organ dysfunction syndrome. Dysfunction of the heart, lung, liver, kidney, and coagulation were all found in the patients. Forty-eight operations were performed in the 23 patients during one month together with comprehensive treatment, and the function of various organs was ameliorated after appropriate treatment. All the 35 patients survived. Conclusions A well-organized team consisting of several cooperative groups with specified duties is very important. As a whole, the treatment protocol should be individualized, basing on the extent of

关键词： burns transportation of patients organization and administration mass casualties

Effect of Sc on Al_(3)Fe phase and mechanical properties of as-cast AA5052 aluminum alloy

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China Foundry 2024年第3期21卷 257-264页

作者： Yang Li Qing yu feng-feng Chen jia-wen He Hong-mei Yang Meng-nie Li Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

The AA5052 aluminum alloy is widely used in automobile and aerospace manufacturing,and with the development of light-weight alloys,it is required that these materials exhibit better mechanical *** studies have demonstrated that the addition of Sc to aluminum alloys can improve both the microstructure and properties of the *** this study,the effect of Sc on the Fe-rich phase and properties of the AA5052 aluminum alloy was studied by adding 0%,0.05%,0.2%,and 0.3%*** results show that with the increase of Sc,the coarse needle-like Fe-rich phase gradually transforms into Chinese-script and then nearly spherical particles,reduce the size of Fe-rich phase,and refine the grain with increase of high angle grain boundaries(HAGBs).These microstructure changes enhance the strength of the AA5052 alloy through Sc *** ductility of the alloy is obviously improved because the addition of a lower amount of Sc changes the morphology of Fe-rich phase from needle-like into a Chinese-script,and it is subsequently reduced as a result of significant increase in HAGBs with increasing Sc content.

关键词： AA5052 aluminum alloy Al3Fe phase mechanical properties grain boundary