5,945 research outputs found
신규 루멘 박테리아 변이균주 및 이를 이용한 숙신사의 제조방법
No full textThe present invention relates to novel rumen bacterial mutants resulted from the disruption of a lactate dehydrogenase gene (ldhA) and a pyruvate formate-lyase gene (pfl) (which are involved in the production of lactic acid, formic acid and acetic acid) from rumen bacteria; a novel bacterial mutant (Mannheimia sp. LPK7) having disruptions of a lactate dehydrogenase gene (ldhA), a pyruvate formate-lyase gene (plf), a phosphotransacetylase gene (pta), and a acetate kinase gene (ackA); a novel bacterial mutant (Mannheimia sp. LPK4) having disruptions of a lactate dehydrogenase gene (ldhA), a pyruvate formate-lyase gene (pfl) and a phosphoenolpyruvate carboxylase gene (ppc) involved in the immobilization of CO2 in a metabolic pathway of producing succinic acid; and a method for producing succinic acid, which is characterized by the culture of the above mutants in anaerobic conditions. The inventive bacterial mutants have the property of producing succinic acid at high concentration while producing little or no organic acids, as compared to the prior wild-type strains of producing various organic acids. Thus, the inventive bacterial mutants are useful as strains for the industrial production of succinic acid
Acoustic black holes for relativistic fluids
No full textWe derive a new acoustic black hole metric from the Abelian Higgs model. In the non-relativistic limit, while the Abelian Higgs model becomes the Ginzburg-Landau model, the metric reduces to an ordinary Unruh type. We investigate the possibility of using (type I and II) superconductors as the acoustic black holes. We propose to realize experimental acoustic black holes by using spiral vortices solutions from the Navier-stokes equation in the non-relativistic classical fluids.XHG thanks Hanyang university and CQUeST for warm hospitality. XHG is indebted to Yunping Wang for helpful discussions. This work was supported in part by the WCU project of Korean Ministry of Education, Science and Technology (R33-2008-000-10087- 0). The work of XHG was partly supported by NSFC, China (No. 10947116), Shanghai Rising-Star Program(No. 10QA1402300) and Shanghai Leading Academic Discipline Project (No. S30105). The work of SJS was supported in part by KOSEF Grant R01-2007-000-10214-0 and by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MEST) (No. 2005-0049409)
Empirical Mode Decomposition Aided by Adaptive Low Pass Filtering
No full textEmpirical Mode Decomposition (EMD) is an adaptive signal
analysis technique which derives its basis functions from the signal itself. EMD is realized through successive iterations of a sifting process requiring local mean computation. For that purpose, local minima and maxima of the signal are assumed to constitute proper local time scales. EMD lacks accuracy, however, experiencing the so-called mode mixing phenomenon in the presence of noise which creates artificial extrema. In this paper, we propose adaptively filtering the signal in Discrete Cosine Transform domain before each local mean computation step to
prevent mode mixing. Denoising filter thresholds are optimized for a product form criterion which is a function of the preserved energy and the eliminated number of extrema of the signal after filtering. Results obtained from synthetic signals reveal the potential of the proposed technique
차량 충돌 감지 모듈 및 이를 구비하는 차량 에어백 전개 시스템
No full textEmbodiments of the present invention may provide a module for detecting a vehicle crash. The module (100) includes a housing (110) mounted to a vehicular frame member at one end portion thereof. The module includes first and second rods (121, 122) housed in the housing. The first rod (121) is contacted to the frame member at one end thereof through the one end portion of the housing. The second rod (122) is contacted to the opposite end of the first rod and being disposed between the first rod and the opposite end portion of the housing. The module includes first and second sensors (131, 132) mounted to the first and second rods respectively for detecting a crash by sequentially measuring stress wave caused by the crash. The first sensor (131) detects a stress wave propagating through the first rod and outputting a signal. The second sensor (132) detects a stress wave propagating through the second rod and outputting a signal. The module includes a biasing member (140) disposed between the second rod and the opposite end portion of the housing for biasing the first and second rods toward the frame member. A magnitude of impedance of the first rod is larger than that of the second rod and the magnitude of impedance of the second rod is larger than that of the biasing member. The module can remarkably reduce the elapsed time required for detecting a crash by measuring a stress wave, which propagates very rapidly through a vehicular frame member
오일 생성능을 가지는 미생물을 이용한 지방산 알킬에스테르의 제조방법
No full textThe present invention relates to a method of producing a fatty acid alkyl ester using microorganisms having the ability to produce oil, and more particularly to a method of producing a fatty acid alkyl ester, the method comprising culturing microorganisms having the ability to produce oil, thus accumulating a large amount of oil in the microorganisms, inducing the autolysis of the produced oil in the microorganisms to produce a free fatty acid, and converting the free fatty acid into an alkyl ester. According to the method of the present invention, oil accumulated in microorganisms, such as triacylglycerol that is typical oil produced by microorganisms, can be converted into a fatty acid alkyl ester with high efficiency using a metabolic engineering approach. Thus, the method of the present invention is useful for the industrial production of a fatty acid alkyl ester which has been recently found to be effective as biodiesel
메탈 플레이크를 이용한 니켈-금속 수소화물 2차 전지용 수소 저장 합금의 표면 개질 방법
No full textDisclosed is a method for modifying a surface of a hydrogen storage alloy for an Ni/MH secondary battery using flake type metal comprising the steps of ball-milling metal powder to produce flake type metal powder; and ball-milling the flake metal powder together with hydrogen storage alloy powder to obtain mixture powder. The method according to the present invention provides the hydrogen storage alloy capable of increasing discharge capacity of an electrode and lengthening electrode life duration for the Ni/MH secondary battery
신규 순수 숙신산 생성 변이 미생물 및 이를 이용한 숙신산 제조방법
No full textThe present invention relates to a rumen bacterial mutant producing homo- succinic acid and a method for producing homo-succinic acid using the same, and more particularly to a rumen bacterial mutant producing succinic acid at a high concentration while producing little or no other organic acids in anaerobic conditions, which is obtained by disrupting a gene encoding lactate dehydrogenase (idhA), a gene encoding phosphotransacetylase (pta), and a gene encoding acetate kinase (ackA), without disrupting a gene encoding pyruvate formate lyase (pβ), as well as a method for producing succinic acid using the same. The inventive rumen bacterial mutant has the property of having a high growth rate and succinic acid productivity while producing little or no organic acids, as compared to the prior strains producing succinic acid. Thus, the inventive rumen bacterial mutant is useful to produce succinic acid for industrial use
콘크리트 구조물의 온도응력 측정장치
No full textDisclosed are a testing apparatus for and a method of measuring thermal stresses of concrete structures. Overcoming the limitations that conventional analytical access techniques have, the apparatus opens a new way to conveniently measure the thermal stress attributable to the heat of hydration generated in concrete structures indoors. Using a material different in coefficient of thermal expansion from concrete, the apparatus can directly measure the change in thermal stress of the concrete which is subjected to internal and/or external confinement. By using various materials, the thermal stress which varies depending on the confinement extent can be inferred. Additionally, an accurate prediction of the thermal stresses generated actually in concrete can be obtained, reflecting unclear physical properties of early-age concrete
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