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平面应变状态下不可压缩幂硬化蠕变材料中刚性片状夹杂的奇异场和局部解

全国第一次麻醉药理学术会议暨中国药理学会麻醉药理专业委员会筹备会

作者： R.g.hahn Linkping.University

Backg.ound:The renal clearance(Cl)of infused crystalloid fluid is very low during.anaesthesia and surg.ry,but experiments in awake sheep indicate that Cl may approach a normal rate when the adrenerg.c balance is modified in favour of?-adrenerg.c *** present study explores this possibility in *** aim of the present

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应用力学学报 1992年第3期9卷 28-35页

作者：陈宜亨 Hans g.hahn 西安交通大学德国Kaiserslautern大学

本文采用Williams特征展开方法结合Lee伪应力函数方法得到了平面应变状态下不可压缩幂硬化蠕变材料中刚性片状夹杂物的奇异场和局部解.研究发现,夹杂物尖端的应力奇性为r^(-m/2),与幂硬化指数m有关;而应变奇性为r^(-1/2),与幂硬化指数无... 详细信息

本文采用Williams特征展开方法结合Lee伪应力函数方法得到了平面应变状态下不可压缩幂硬化蠕变材料中刚性片状夹杂物的奇异场和局部解.研究发现,夹杂物尖端的应力奇性为r^(-m/2),与幂硬化指数m有关;而应变奇性为r^(-1/2),与幂硬化指数无关.本文通过选择积分路径给出了近尖的局部解,并用显函数的形式给出了近尖应力和位移的角变化.

关键词：材料力学平面应变蠕变刚性夹杂

Smart Proactive Caching.Scheme for Fast Authenticated Handoff in Wireless LAN

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Journal of Computer Science & Technolog. 2007年第3期22卷 476-480页

作者： Sin-Kyu Kim Jae-Woo Choi Dae-Hun Nyang.g.ne-Beck hahn Joo-Seok Song Electronics Telecommunications Research Institute Daejeon Korea g.aduate School of Information Technolog. and Telecommunications Inha University IncheonKorea Mobile Communication Technolog. Research Lab Lg.Electronics AnyangKorea Department of Computer Science Yonsei University SeoulKorea

Handoff in IEEE 802.11 requires the repeated authentication and key exchang. procedures, which will make the provision of seamless services in wireless LAN more difficult. To reduce the overhead, the proactive caching.schemes have been proposed. However, they require too many control packets delivering.the security context information to neig.bor access points. Our contribution＇ is made in two-fold： one is a sig.ificant decrease in the number of control packets for proactive caching.and the other is a superior cache replacement alg.rithm.

关键词： wireless local area network (LAN) security authentication simulation

Lig.tweig.t in Automotive Components by Forming.Technolog.

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Automotive Innovation 2020年第3期3卷 195-209页

作者： Stephan Rosenthal Fabian Maaß Mike Kamaliev Marlon hahn Soeren g.es A.Erman Tekkaya Institute of Forming.Technolog. and Lig.tweig.t Components(IUL) TU Dortmund University44227 DortmundGermany

Lig.tweig.t desig. is one of the current key drivers to reduce the energ. consumption of *** methodolog.es for lig.tweig.t components,strateg.es utilizing.materials with favorable specific properties and hybrid materials are used to increase the performance of parts for automotive *** this paper,various forming.processes to produce lig.t parts are *** lig.tweig.t desig. is discussed,covering.the manufacturing.processes to produce hybrid components like fiber-metal,polymer-metal and metal-metal composites,which can be used in subsequent deep drawing.or combined forming.*** to increasing.the specific streng.h and stiffness with thermomechanical forming.processes as well as the in situ control of the microstructure of such components are *** lig.tweig.t desig. discusses possibilities to plastically form hig.-streng.h or hig.-performance materials like mag.esium or titanium in sheet,profile and tube forming.*** join those materials and/or dissimilar materials,new joining.by forming.technolog.es are *** economically produce lig.tweig.t parts with g.ars or functional elements,incremental sheet-bulk metal forming.is *** an important part property,the damag. evolution during.the forming.operations will be discussed to enable even lig.ter parts throug. a more reliable *** methods for predicting.and tailoring.the mechanical properties like streng.h and residual stresses will be *** possibilities of system lig.tweig.t desig. with forming.technolog.es are presented.A combination of additive manufacturing.and forming.to produce hig.ly complex parts with integ.ated functions will be *** integ.ation of functions by a hot extrusion process for the manufacturing.of shape memory alloys is *** in-depth understanding.of the newly developed processes,methodolog.es and effects allows for a more accurate dimen-sioning.of *** facilitates a reduction in th

关键词： Forming.technolog. Lig.tweig.t desig. Energ. efficiency Manufacturing.processes

Three-dimensional problem of transient contact dynamics

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Science China Mathematics 1996年第10期39卷 1096-1105页

作者：范天佑 H.g.hahn A.Voig. Beijing.Institute of Technolog. Beijing 100081 China University of Kaiserslautern D -67663 Kaiserslautern Germany

An analytic solution to three-dimensional problem of transient contact dynamics is developed, and a g.neralized g.lin’s theorem is proved. Based on the theorem, contact displacements can be determined analytically when the g.ven contact stresses are some quite g.neral functions; in contrast to this, one can readily evaluate the corresponding.contact stresses in analytic version when some quite g.neral displacements are prescribed. The quite g.neral form mentioned above means the prescribed quantities are any polynomials of x and y and any transient function of time. Numerical results for the contact displacements-time variation dearly demonstrate the effect of inertia induced by the dynamic stress.

关键词： transient dynamic contact three-dimensional problem g.neralized g.lin’s theorem.

Spatial heterog.neity of flesh-cell osmotic potential in sweet cherry affects partitioning.of absorbed water

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Horticulture Research 2020年第1期7卷 2104-2113页

作者： Eckhard g.imm Daniel Pflug.elder Jan hahn Moritz Jonathan Schmidt Hendrik Dieckmann Moritz Knoche Institut für g.rtenbauliche Produktionssysteme Leibniz Universität HannoverAbteilung ObstbauHerrenhäuser Straße 2D-30419 HannoverGermany Forschung.zentrum Jülich IBG-2:PflanzenwissenschaftenWilhelm-Johnen-StraßeD-52428 JülichGermany Laser Zentrum Hannover e.V. Hollerithallee 8D-30419 HannoverGermany

A fleshy fruit is commonly assumed to resemble a thin-walled pressure vessel containing.a homog.nous carbohydrate *** sweet cherry(Prunus avium L.)as a model system,we investig.te how local differences in cell water potential affect H2O and D2O(heavy water)*** partitioning.of H2O and D2O was mapped nondestructively using.mag.etic resonance imag.ng.MRI).The chang. in size of mesocarp cells due to water movement was monitored by optical coherence tomog.aphy(OCT,non-destructive).Osmotic potential was mapped using.microosmometry(destructive).Virtual sections throug. the fruit revealed that the H2O distribution followed a net pattern in the outer mesocarp and a radial pattern in the inner *** patterns alig. with the disposition of the vascular bundles.D2O uptake throug. the skin paralleled the acropetal g.adient in cell osmotic potential g.adient(from less neg.tive to more neg.tive).Cells in the vicinity of a vascular bundle were of more neg.tive osmotic potential than cells more distant from a vascular *** revealed net H2O uptake was the result of some cells loosing.volume and other cells increasing.volume.H2O and D2O partitioning.following.uptake is non-uniform and related to the spatial heterog.neity in the osmotic potential of mesocarp cells.

关键词： potential Spatial bundle

Intrahepatic cholang.ocarcinoma: Introducing.the preoperative prediction score based on preoperative imag.ng

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Hepatobiliary & Pancreatic Diseases International 2021年第3期20卷 262-270页

作者： Fabian Bartsch Felix hahn Lukas Müller Janine Baumg.rt Maria Hoppe-Lotichius Roman Kloeckner Hauke Lang Department of g.neral Visceral and Transplant SurgeryUniversity Medical Center of the Johannes Gutenberg-University MainzLangenbeckst155131 MainzGermany Department of Diag.ostic and Interventional Radiolog. University Medical Center of the Johannes Gutenberg-University MainzLangenbeckst155131 MainzGermany

Backg.ound: Intrahepatic cholang.ocarcinoma(ICC) still has a poor long.term outcome, even after complete resection. We investig.ted different parameters g.thered in preoperative imag.ng.and analyzed their influence on resectability, recurrence, and survival. Methods: All patients who underwent exploration due to ICC between January 2008 and June 2018 were analyzed retrospectively. Kaplan-Meier model, log.rank test and Cox reg.ession were used. Results: Out of 184 patients, 135(73.4%) underwent curative intended resection. Median overall survival(OS) was 22.2 months with a consecutive 1-, 3-and 5-year OS of 73%, 29%, and 17%. Median recurrencefree survival(RFS) was 9.3 months with a consecutive 1-, 3-and 5-year RFS of 36%, 15%, and 11%. Site of tumor, parenchymal localization, tumor config.ration/dissemination, and estimated tumor volume had sig.ificant influence on resectability. Univariate analyses showed that site of tumor, tumor config.ration/dissemination, number of nodules, and estimated tumor volume had predictive values for OS and RFS. Tog.ther with tumor size the preoperative prediction(POP) score was created showing.sig.ificance for OS and RFS(all Pg.(HR=1.255;95% CI: 1.040-1.514;P=0.018) and N stag.(HR=1.334;95% CI: 1.081-1.645;P=0.007) were the independent predictors for OS. For RFS, POP score(HR=1.733;95% CI: 1.30 0-2.311;Pg.(HR=3.036;95% CI: 1.376-6.697;P=0.006) were the independent predictors. Conclusions: The POP score showed to have a hig.ly sig.ificant influence on OS and RFS. The score is easy to assess throug. preoperative imag.ng. For patients in the hig. risk g.oup at least stag.ng.laparoscopy or preoperative chemotherapy should be evaluated, because they showed equal outcome compared to the irresectable g.oup.

关键词： Intrahepatic cholang.ocarcinoma Cholang.ocarcinoma Liver surg.ry Preoperative imag.ng Survival

Mag.etic Properties of Nanostructured Fe_(40)Ni_(38)Mo_(4)B_(l8)

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Chinese Physics Letters 1999年第3期16卷 211-213页

作者： LI Jian-g.ng.SU Zhi-bin WEI Fu-lin YANg.Zheng.Horst hahn WANg.Tian-min g. Shi-hui Department of Materials Science Lanzhou UniversityLanzhou 730000 Applied Mag.etism Laboratory of the Education Ministry Lanzhou UniversityLanzhou 730000 Department of Materials Science Darmstadt University of Technology64287 DarmstadtGermany School of Science Beijing University of Aeronautics and AstronauticsBeijing 100083 Department of Physics Lanzhou UniversityLanzhou 730000

Nanostructured Fe_(40)Ni_(38)Mo_(4)B_(l8) prepared by crystallization technique has a microstructure of nanometer-sized fcc(Fe,Ni)solid solution crystallites embedded in a nanometer-thick amorphous *** nanostructured Fe_(40)Ni_(38)Mo_(4)B_(l8) obtained at 740K has the optimal soft mag.etic *** maximal mag.etic softening.can be understood by considering.the combination of the zero anisotropy and the lowest saturation mag.etostriction.

关键词： softening microstructure mag.etic

Bioinspired urease-powered micromotor as an active oral drug.delivery carrier in stomach

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Bioactive Materials 2022年第3期7卷 54-62页

作者： Hyunsik Choi Sang.Hoon Jeong.Tae Yeon Kim Jeeyoon Yi Sei Kwang.hahn Department of Materials Science and Eng.neering Pohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohangGyeongbuk37673South Korea

Self-propelling.micro-and nano-motors(MNMs)have been extensively investig.ted as an emerg.ng.oral drug.delivery carrier for g.strointestinal(g.)tract ***,the propulsion of current MNMs reported so far is mostly based on the redox reaction of metals(such as Zn and Mg.with severe propulsion g.s g.neration,remaining.non-deg.adable residue in the g. ***,we develop a bioinspired enzyme-powered biopolymer micromotor mimicking.the mucin penetrating.behavior of Helicobacter pylori in the *** converts urea to ammonia and the subsequent increase of pH induces local g.l-sol transition of the mucin layer facilitating.the penetration into the stomach tissue *** successful fabrication of micromotors is confirmed by hig.-resolution transmission electron microscopy,electron energ. loss spectroscopy,dynamic lig.t scattering.analysis,zeta-potential *** acidic condition,the immobilized urease can efficiently converted urea to ammonia,comparable with that of neutral condition because of the increase of surrounding.pH during.*** administration into the stomach,the micromotors show enhanced penetration and prolong.d retention in the stomach for 24 ***,histolog.cal analysis shows that the micromotors are cleared within 3 days without causing.any toxicity in the g. *** enhanced penetration and retention of the micromotors as an active oral delivery carrier in the stomach would be successfully harnessed for the treatment of various g. tract diseases.

关键词： Micro-and nanomotors Polydopamine Urease Oral delivery Stomach diseases