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Emergency transcatheter arterial embolization for patients with acute massive duodenal ulcer hemorrhage

World Journal of Gastroenterology 2012年第34期18卷 4765-4770页

作者： Yong-Li Wang Ying-Sheng Cheng Li-Zhen Liu Zhong-Hui He kun-hong ding Department of lnterventional Radiology Fengxian Branch Hospital of Affiliated 6th People's Hospital of Shanghai Jiaotong University Shanghai 201400 China Department of Diagnostic and Interven- tional Radiology Shanghai Jiaotong University Affiliated 6th People's Hospital Shanghai 200233 China

AIM：To evaluate the efficacy and safety of emergency transcatheter arterial embolization （ETAE） for patients with acute massive duodenal ulcer hemorrhage. METHODS：Twenty-nine consecutive patients with acute massive bleeding of duodenal ulcer were admitted to our hospital from 2006 to 2011. Superselective angiography of the celiac and gastroduodenal arteries was performed to find out the bleeding sites before ETAE, then, embolotherapy was done with gelatin sponge particles or microstrips via a 5 French angio-graphic catheter or 3 French microcatheter. After ETAE, further superior mesenteric arteriography was under-taken in case collateral circulation supplied areas of the duodenal ulcer. Technical and clinical success rates were analyzed. Changes in the mucous membrane were observed using endoscopy following ETAE. RESULTS：Angiography showed active bleeding with extravasation of contrast medium in seven cases with a 24% positive rate of celiac artery bleeding, and in 19 cases with a 65.5% rate of gastroduodenal artery bleeding. There were no angiographic signs of bleeding in three patients who underwent endoscopy prior to ETAE. Twenty-six patients achieved immediate hemostasis and technical success rate reached 90%. No hemostasis was observed in 27 patients within 30 d after ETAE and clinical success rate was 93%. Recurrent hemorrhage occurred in two patients who drank a lot of wine who were treated by a second embolotherapy in the same way. Five patients underwent transient ischem with light abdominal pain under xiphoid, spontaneous restoration without special treatment. No mucous necrosis happened to 29 cases for ischem of gastroduodenal arteries embolized. CONCLUSION：ETAE is an effective and safe measure to control acute massive bleeding of duodenal ulcer.

关键词： Transcatheter embolization Massive bleed-ing Duodenal ulcer Angiography

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Rock fracture mechanism of buffer blasting with cushion layer at the borehole bottom

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 325-334页

作者： Xinguang Zhu Chenxi ding Zhe Sui hong Su Xu Guo School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China

This study primarily investigates the rock fracture mechanism of bottom cushion layer blasting and explores the effects of the bottom cushion layer on rock *** involves analyses of the evolution patterns of blasting stress,characteristics of crack distribution,and rock fracture features in the ***,blasting model experiments were carried out using the dynamic caustics principle to investigate the influence of bottom cushion layers and initiation methods on the integrity of the bottom rock *** experimental results indicate that the combined use of bottom cushion layers and inverse initiation effectively protects the integrity of the bottom rock ***,the process of stress wave propagation and dynamic crack propagation in rocks was simulated using the continuum-discontinuum element method(CDEM)and the Landau explosion source model,with varying thicknesses of bottom cushion *** numerical simulation results indicate that with increasing cushion thickness,the absorption of energy generated by the explosion becomes more pronounced,resulting in fewer cracks in the bottom rock *** illustrates the positive role of the cushion layer in protecting the integrity of the bottom rock mass.

关键词： bottom cushion layer blasting crack propagation continuum-discontinuum element method dynamic stress intensity factor

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基于STM32的图像编码与采集系统

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电子设计工程 2018年第5期26卷 179-183页

作者：王坤丁红胜北京科技大学数理学院北京100083 北京科技大学北京市弱磁检测及应用工程技术研究中心北京100083

随着机器视觉、模式识别、图像处理等技术的发展,图像编码与采集技术也显得越来越重要。针对图像采集系统的开发成本、开发难度以及所采集图像的清晰度方面的问题,本文采用意法半导体公司的STM32F407单片机作为主控芯片,OV2640摄像头模... 详细信息

随着机器视觉、模式识别、图像处理等技术的发展,图像编码与采集技术也显得越来越重要。针对图像采集系统的开发成本、开发难度以及所采集图像的清晰度方面的问题,本文采用意法半导体公司的STM32F407单片机作为主控芯片,OV2640摄像头模块作为图像采集模块,设计了一款低功耗、低成本的图像编码与采集系统。利用STM32的数字摄像头(DCMI)接口、直接存储器访问(DMA)等外设,以及OV2640的硬件编码能力,本系统可以采集分辨率为1600*1200的JPEG格式的图像,或者将RGB565格式的图像编码成分辨率为800*480的BMP格式图像,并将采集到的图像保存到SD卡。

关键词：嵌入式系统 STM32F4 图像编码图像采集 OV2640

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利水通淋、活血化瘀法对TRPV5在含钙肾结石患者肾组织中表达的影响

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河南中医 2017年第10期37卷 1798-1800页

作者：刘坤曾彩虹丁建业清远市中医院广东清远511500

目的:探讨利水通淋、活血化瘀法对新型钙离子通道TRPV5在含钙肾结石患者肾组织中表达的影响。方法:将80例肾结石患者随机分为含钙消瘀化石合剂组、含钙结石组、非含钙消瘀化石合剂组及非含钙结石组,每组各20例,并选取同期因其他非肾结... 详细信息

目的:探讨利水通淋、活血化瘀法对新型钙离子通道TRPV5在含钙肾结石患者肾组织中表达的影响。方法:将80例肾结石患者随机分为含钙消瘀化石合剂组、含钙结石组、非含钙消瘀化石合剂组及非含钙结石组,每组各20例,并选取同期因其他非肾结石原因接受肾脏切除的20例患者为对照组进行对比研究。含钙消瘀化石合剂组术前服用消瘀化石合剂,含钙结石组术前未服用消瘀化石合剂,非含钙消瘀化石合剂组术前服用消瘀化石合剂,非含钙结石组术前未服用消瘀化石合剂。检测所有患者24 h尿钙含量,免疫组织化学法检测肾组织TRPV5含量。结果:含钙消瘀化石合剂组24 h尿钙为(6.26±1.76)mmol,含钙结石组的24 h尿钙为(8.50±2.35)mmol,两组比较,差异具有统计学意义(P<0.05);非含钙消瘀化石合剂组为(6.11±1.72)mmol,非含钙结石组为(6.26±1.76)mmol,对照组为(9.62±2.32)mmol,三组组间比较,差异具有统计学意义(P<0.05)。免疫组化检测含钙消瘀化石合剂组肾组织中TRPV5强表达3例、中表达7例、低表达10例;含钙结石组肾组织中TRPV5强表达1例、中表达5例、低表达14例;非含钙消瘀化石合剂组中TRPV5强表达12例、中表达5例、低表达3例;非含钙结石组肾组织中TRPV5强表达9例、中表达7例、低表达4例;对照组肾组织中TRPV5强表达9例、中表达6例、低表达5例,含钙消瘀化石合剂组与含钙结石组,非含钙消瘀化石合剂组与非含钙结石组及对照组肾组织TRPV5的表达比较,差异均有统计学意义(P<0.05)。结论:利水通淋、活血化瘀法抑制肾结石形成的机制可能是通过上调肾组织中TRPV5的表达,以减少高钙尿及含钙结石的发生。

关键词：利水通淋法活血化瘀法 TRPV5 肾结石

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Enhanced post-combustion CO2 capture and direct air capture by plasma surface functionalization of graphene adsorbent

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Journal of Energy Chemistry 2025年第1期100卷 653-664页

作者： Rahul Navik Eryu Wang Xiao ding Huang Yunyi Yiyu Liu Jia Li Guangdong-hong Kong Joint Laboratory for Carbon Neutrality Jiangmen Laboratory of Carbon and Science and Technology Guangzhou HKUST Fok Ying Tung Research Institute The hong Kong University of Science and Technology (Guangzhou) Carbon Neutrality and Climate Change Thrust Society Hub The Hong Kong University of Science and Technology (Guangzhou) Stoddart Institute of Molecular Science Department of Chemistry Zhejiang University

Graphene has enormous potential to capture CO2due to its unique properties and ***,graphene-based adsorbents have drawbacks of lower CO2adsorption capacity and poor *** work demonstrates a one-step rapid and sustainable N2/H2plasma treatment process to prepare graphene-based sorbent material with enhanced CO2adsorption *** treatment directly enriches amine species,increases surface area,and improves textural *** CO2adsorption capacity increases from 1.6 to 3.3 mmol/g for capturing flue gas,and from 0.14 to 1.3 mmol/g for direct air capture （DAC）.Importantly,the electrothermal property of the plasma-modified aerogels has been significantly improved,resulting in faster heating rates and significantly reducing energy consumption compared to conventional external heating for regeneration of *** aerogels display improved selectivity of 42 and 87 after plasma modification for 5 and 10 min,*** plasma-treated aerogels display minimal loss between 17%and 19% in capacity after 40 adsorption/desorption cycles,rendering excellent *** N2/H2plasma treatment of adsorbent materials would lower energy expenses and prevent negative effects on the global economy caused by climate change.

关键词： Carbon neutrality CO 2 capture Climate change Plasma treatment Graphene aerogel

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Breaking new ground in photocatalysis: lutetium texaphyrin as a trigger for pyroptosis through biomolecular photoredox reactions

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Science China Chemistry 2025年第1期 1-2页

作者： Qihang ding Mengrong He Meijia Gu Department of Chemistry Korea University Department of Ultrasound Medicine Union Hospital Tongji Medical College Huazhong University of Science and Technology Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE) School of Pharmaceutical Sciences Wuhan University

Malignant neoplasms consistently pose a significant threat to global public health [1,2]. In recent years, immunotherapy has demonstrated remarkable clinical success; however, its efficacy is limited by the scarcity of immune cell infiltration within tumor microenvironments. Cell pyroptosis, a gasdermin-mediated process characterized by cellular swelling,rupture, and the release of intracellular contents such as IL-1β, IL-18, ATP, HMGB1, plays a crucial role in this context[3,4].

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Fracture morphologies of a hot stamped steel and comparisons with several sheet metals

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Journal of Iron and Steel Research International 2017年第6期24卷 634-640页

作者： Shu-lin Tan kun Yang Ya-nan ding Xian-hong Han Department of Plasticity Technology Shanghai Jiao Tong University Shanghai 200030 China Institute of Chemical Material China Academy of Engineering Physics Mianyang 621900 Sichuan China Department of Civil and Environmental Engineering Northwestern University Evanston 60208 Illinois USA

Hot stamping has been widely used in car industry to produce safety components. Most existing re- searches focused on the stamping and quenching process, but less on the mechanical properties of stamped parts. The fracture behaviors of hot stamped boron steel B1500HS have been studied, and other four commonly used sheet metals with different strengths, including Q235, TRIP780, QP980 and MS1300, were also introduced for comparison. Both uniaxial tests and mechanical trimming tests were performed, and the fracture surfaces under different stress states were observed and discussed. The SEM observations showed that the fracture models are closely related to the stress states, i. e., the tensile surfaces have ductile rupture characters while the trimming surfaces have brittle rupture characters. Compared with other steels, the quenched boron steel has smaller dimple size accompa- nied by shear planes in the tensile surface, and has smaller burnish zone in the trimming surface, and its cutting surface with ＇S＇ like shape is also very different with others. Furthermore, two fitted em pirical models were derived to describe the quantitative correlations between the average dimple diam- eter and the steel strength and between the percentage of burnish zone and the steel strength.

关键词： Hot stamped steelFracture morphologyTensile testMechanical trimming testSteel comparison

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Controlled cationic ring-opening polymerization of L-lactide by organic ion pair: novel approach to isotactic-rich and crystalline polylactide

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Science China Chemistry 2025年第1期 394-402页

作者： Zhiqiang ding Mingqian Wang Zijing Zhou Bin Wang Yuesheng Li Tianjin Key Laboratory of Composite & Functional Materials School of Materials Science and Engineering Tianjin University

Living/controlled cationic ring-opening polymerization （ROP） of L-lactide is a promising approach to isotactic-rich and crystalline poly（L-lactide）.In contrast with the unsubstituted lactones,L-LA can not be polymerized by organic Lewis acids or carbenium ions,and the state of the art in this field is the cationic ROP of L-LA catalyzed by Br?nsted acid/alcohol system via activated monomer ***,we reported the first example of controlled cationic ROP of L-LA by using Meerweintype ion pair[Me3O]+[B（C6F5）4]-as the catalyst.[Me3O]+[B（C6F5）4]-promoted rapid L-LA cationic polymerization in the absence of alcohol,producing isotactic-rich and crystalline PLLA without transesterification and epimerization side *** activated chain end mechanism,involving twice SN2 substitution and configuration-inversion （S→R→S） with the assistance of released Me2O,was proposed and further verified by density functional theory and control *** work expands the catalytic toolbox of isotactic-rich and crystalline polylactide *** represents a unique example of cationic-controlled polymerization of L-LA catalyzed by an organic ion pair.

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Microstructure and properties of AgCu/2 wt%Ag-added Sn-Pb solder/CuBe joints fabricated by vapor phase soldering

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Rare Metals 2022年第6期41卷 1983-1988页

作者： Wei Liu Rong An Ying ding Chun-Qing Wang Yan-hong Tian kun Shen State Key Laboratory of Welding and Joining Harbin Institute of TechnologyHarbin 150001China School of Engineering and Physical Sciences Heriot-Watt UniversityEdinburgh EH144ASUK Key Laboratory of Miero-systems and Micro-structures Manufacturing Ministry of Education.Harbin Institute of TechnologyHarbin 150001China Beijing Institute of Control Engineering Beijing 100190China

The purpose of this paper is to investigate the effect of 2 wt%Ag addition in Sn-Pb eutectic solder on microstructure and mechanical properties of AgCu/solder/CuBe joint fabricated by vapor phase soldering.63Sn37Pb and 62Sn36Pb2Ag solder pastes were used to join Cu(1.7 wt%-2.5 wt%)Be and Ag(2 wt%-5 wt%)Cu *** fracture modes are observed in 62Sn36Pb2Ag and 63Sn37Pb joints after lateral shear tests at room temperature or 120℃,and shear forces of 62Sn36Pb2Ag joints are far higher than those of 63Sn37Pb *** obvious difference is observed in morphology and thickness of intermetallic compounds(IMCs)at interfaces of the 63Sn37Pb and 62Sn36Pb2Ag *** the two kinds of joints,for-mation of big blocky or plate-like Ag_(3)Sn is ***,many Ag_(3)Sn IMCs particles(1-3 μm in width)in isolated and dispersed distribution are observed within 62Sn36Pb2Ag *** Ag3Sn particles are responsible for the better mechanical properties of 62Sn36Pb2 Ag joints than those of 63Sn37Pb *** results present in this paper may provide a guide for restraining formation of big blocky or plate-like Ag_(3) Sn in joints with Ag pads or thick Ag surface finish on pads by utilizing vapor phase soldering process,and improving mechanical properties of Cu/SnPb/Ag joints by adding Ag in SnPb eutectic solder.

关键词： Microstructure Mechanical property 62Sn36Pb2Ag solder Ag,Sn Vapor phase soldering

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Typical Gait Analysis of a Six-legged Robot in the Context of Metamorphic Mechanism Theory

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Chinese Journal of Mechanical Engineering 2013年第4期26卷 771-783页

作者： XU kun ding Xilun Robotics Institute Beihang University

The equivalent mechanism of the system is often considered as one specific mechanism in most existing studies of multi-legged robots, however the equivalent mechanism is varying while the robot moves on the ground. Four typical tripod period gaits of a radial symmetrical six-legged robot are analyzed. Similar to the metamorphic mechanism, the locomotion of multi-legged robot is considered as a series of varying hybrid serial-parallel mechanisms by assuming the constraints of the feet on the ground with hinges. One gait cycle is divided into several periods, and in different walking period there is a specific equivalent mechanism corresponding to it, and the walking process of multi-legged robot is composed by these series of equivalent mechanisms. Walking performance can be got by analyzing these series of equivalent mechanisms. Kinematics model of the equivalent mechanism is established, workspaces of equivalent mechanisms are illustrated by simulation and a concept of static stability workspace is proposed to evaluate the static stability of these four gaits. A new method to calculate the stride length of multi-legged robots is presented by analyzing the relationship between the workspace of two adjacent equivalent parallel mechanisms in one gait cycle. The stride lengths of four gaits are given by simulations. Comparison of stride length and static stability among these four typical tripod gaits are given. It has been proved that mixed gait and insect-wave gait II have better static stability than mammal kick-off gait and insect-wave gait I. Insect-wave gait II displays its advantage on stride length while the height of robot body lower than 87 mm, mammal kick-off gait has superiority on stride length while the height of robot body higher than 115 mm, and insect-wave gait I shows its shortcoming in stride length. The proposed method based on metamorphic theory and combining the footholds and body height of robot provides a new method to comprehensive analyze the

关键词： multi-legged robot gait comparison stride length static stability

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