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Manual Application of Adhesives
Hellmanns, Mark,Bohm, Stefan,Dilger, Klaus The Society of Adhesion and Interface 2006 접착 및 계면 Vol.7 No.4
International standards claim the best possible reliability in industrial manufacturing processes. This is also essential for the application with manual applicators. The application of adhesives with manual applicators is one of the most frequently used application techniques. The range of application reaches from the building of prototypes in the automobile industry over the use in single or small-batch manufacturing up to applications in crafts enterprises. Conventional manual applicators for adhesives and sealants don't fulfill the demands in international standards for the best possible reliability. Only the worker is able to control the quality and the quantity of the bond. A velocity-controlled manual applicator solves these restrictions. Special sensors and micro controllers calculate the flow-rate, the velocity and the location of the manual applicator. This leads to stable and repeatable application processes which are claimed in international standards. The location of the bond can be compared with the nominal value, so that it is possible to check the quality of the bond during application. Furthermore there is the potential to document the data of the manufacturing process.
Lock-In Thermography Based NDT of Parts for the Automotive Industry
Bohm, Stefan,Hellmanns, Mark,Backes, Andreas,Dilger, Klaus The Society of Adhesion and Interface 2006 접착 및 계면 Vol.7 No.4
The successful use of adhesively bonded parts depends on the defect-free bond of the components. Therefore it is necessary to detect relevant faults and defects in an early state of the production. A 100% test should be pursued, but especially at complicated structures the detection of defects is not easy. Possible testing methods, which show a high potential for the NDT of adhesively bonded parts, are thermography based NDT methods. At present mainly two different procedures of active thermography are being used: Pulse and Lock-In Thermography. With pulse thermography the examined material is warmed up with a short energy pulse (light, eddy current or ultrasonic pulse) and the heat response is recorded after a certain time. The result is an infrared image which indicates material defects in different depths. This paper presents a variety of images showing the capability of Lock-In Thermography to image subsurface defects. Several examples of adhesives joints qualify the ultrasonic Lock-In-Thermography for the in-process quality control for adhesive bonded components.
Distribution of Ubiquitin Protein in Meristematic Mesophyll Cells of Barley Leaves
Hellmann, Andreas,Seo, Seung Hee,Park, Hyeon Yong 한국식물학회 1998 Journal of Plant Biology Vol.41 No.2
The distribution of ubiquitin protein in meristematic mesophyII cells of barley (Hordeum vulgare L.) leaves was investigated by using immunofluorescence microscopy. Simultaneous observation of nuclei was achieved by DAPI (4.6-diamidino-2-phenylindol-dihydrochloride) staining. A strong correlation between the chromatin organisation and the ubiquitin distribution could be observed. Interphase nuclei revealed an intense content of ubiquitin and accumulation of ubiquitin at the nuclear envelope, whereas condensed chromosomes of dividing cells excluded any ubiquitin appearance. During cell division, the aggregation of ubiquitin protein was detected in the area of the mitotic spindle in anaphase as well as the area of the cell plate in the late telophase.
Tubulin protein expression in different tissues and isolated leaf mesophyll cells of barley plants
Andreas, Hellmann,Seo, Seung Hee,Park, Hyeon Yong 조선대학교 생명과학연구소 1997 생명과학 연구 Vol.5 No.-
The expression of tubulin protein isotypes has been investigated in different tissues of Barley (Hordeum vulgare L.) by the means of two-dimensional electrophoresis and westernblot analyses. The expression of tubulin isotypes seems to be tissue dependent for root, coleoptile and leaf, so each organ contains a characteristic set of tubulin isotypes. Some of them appear to be expressed more or less constitutively, whereas others could only be detected in only one organ investigated. Especially for α-tubulin, a high degree of isotype variation could be described. The isolation of mesophyll cells initiates a strong disruption of microtubules and breakdown of tubulin proteins.
Party System Institutionalization Without Parties: Evidence from Korea
Olli Hellmann 동아시아연구원 2014 Journal of East Asian Studies Vol.14 No.1
Formally institutionalized party organization is usually considered a prerequisite for the development of programmatic linkages between parties and voters. However, in this article I show that political parties in South Korea have succeeded in stabilizing interparty competition through programmatic linkages without making any significant efforts to build a formal organizational base. In fact, it could be argued that South Korea is a “partyless” democracy, as political parties get easily captured by the interests of ambitious politicians, thus failing to establish themselves as independent actors. I therefore make a more general argument about the concept of party system institutionalization: we need to rethink the current practice of aggregating the different attributes of party system institutionalization into a single scale, as these attributes do not seem to be connected in a linear fashion.
Physical Model Investigation of a Compact Waste Water Pumping Station
Kirst, Kilian,Hellmann, D.H.,Kothe, Bernd,Springer, Peer Korean Society for Fluid machinery 2010 International journal of fluid machinery and syste Vol.3 No.4
To provide required flow rates of cooling or circulating water properly, approach flow conditions of vertical pump systems should be in compliance with state of the art acceptance criteria. The direct inflow should be vortex free, with low pre-rotation and symmetric velocity distribution. Physical model investigations are common practice and the best tool of prediction to evaluate, to optimize and to document flow conditions inside intake structures for vertical pumping systems. Optimization steps should be accomplished with respect to installation costs and complexity on site. The report shows evaluation of various approach flow conditions inside a compact waste water pumping station. The focus is on the occurrence of free surface vortices and the evaluation of air entrainment for various water level and flow rates. The presentation of the results includes the description of the investigated intake structure, occurring flow problems and final recommendations.