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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Struktur- und Funktionsanalyse der Protease RasP aus Bacillus subtilis

Drechsel, Susan 10 October 2014 (has links) (PDF)
Bacillus subtilis ist einer der bislang am besten untersuchten Organismen. Es gilt als Modellbakterium, an welchem stoffwechselphysiologische und genetische Phänomene grundlegend aufgeklärt wurden. Daneben gehört B. subtilis zu den generell unbedenklichen Mikroorganismen und wird von der U.S. Food and Drug Administration (FDA) als ‚GRAS‘ (Generally Regarded As Safe) eingestuft. Dementsprechend wird B. subtilis in der biotechnologischen Industrie zur Herstellung vielfältiger Produkte, z.B. in der Lebensmittelindustrie, eingesetzt. Als Gram-positives Bakterium eignet sich B. subtilis vor allem zur Produktion extrazellulärer Enzyme wie Proteasen und Amylasen. Die Untersuchung der Sekretion dieser Proteine ist sowohl für die grundlagen- als auch für die anwendungsorientierte Forschung von wichtiger Bedeutung. Vorarbeiten der Arbeitsgruppe von Prof. Wiegert haben gezeigt, dass eine Deletionsmutante im Gen der Protease RasP einen vollständigen Defekt der Sekretion einer α-Amylase verursacht. In meiner Promotionsarbeit soll untersucht werden, welche Rolle RasP bei der Sekretion dieser α-Amylase spielt, und welchen Einfluss diese Protease auf die Proteinsekretion allgemein ausübt. Zudem soll, u.a. am Beispiel von Signalpeptiden, der Mechanismus der Substraterkennung durch RasP untersucht werden. Ich erhoffe, mit dieser Arbeit einen entscheidenden Beitrag zum Verständnis der Funktion der Protease RasP zu leisten und damit eine weitere gezieltere Optimierung von B. subtilis Produktionsstämmen in der biotechnologischen Industrie zu ermöglichen.
2

Struktur- und Funktionsanalyse der Protease RasP aus Bacillus subtilis

Drechsel, Susan 10 October 2014 (has links)
Bacillus subtilis ist einer der bislang am besten untersuchten Organismen. Es gilt als Modellbakterium, an welchem stoffwechselphysiologische und genetische Phänomene grundlegend aufgeklärt wurden. Daneben gehört B. subtilis zu den generell unbedenklichen Mikroorganismen und wird von der U.S. Food and Drug Administration (FDA) als ‚GRAS‘ (Generally Regarded As Safe) eingestuft. Dementsprechend wird B. subtilis in der biotechnologischen Industrie zur Herstellung vielfältiger Produkte, z.B. in der Lebensmittelindustrie, eingesetzt. Als Gram-positives Bakterium eignet sich B. subtilis vor allem zur Produktion extrazellulärer Enzyme wie Proteasen und Amylasen. Die Untersuchung der Sekretion dieser Proteine ist sowohl für die grundlagen- als auch für die anwendungsorientierte Forschung von wichtiger Bedeutung. Vorarbeiten der Arbeitsgruppe von Prof. Wiegert haben gezeigt, dass eine Deletionsmutante im Gen der Protease RasP einen vollständigen Defekt der Sekretion einer α-Amylase verursacht. In meiner Promotionsarbeit soll untersucht werden, welche Rolle RasP bei der Sekretion dieser α-Amylase spielt, und welchen Einfluss diese Protease auf die Proteinsekretion allgemein ausübt. Zudem soll, u.a. am Beispiel von Signalpeptiden, der Mechanismus der Substraterkennung durch RasP untersucht werden. Ich erhoffe, mit dieser Arbeit einen entscheidenden Beitrag zum Verständnis der Funktion der Protease RasP zu leisten und damit eine weitere gezieltere Optimierung von B. subtilis Produktionsstämmen in der biotechnologischen Industrie zu ermöglichen.
3

Can my chip behave like my brain?

George, Suma 27 May 2016 (has links)
Many decades ago, Carver Mead established the foundations of neuromorphic systems. Neuromorphic systems are analog circuits that emulate biology. These circuits utilize subthreshold dynamics of CMOS transistors to mimic the behavior of neurons. The objective is to not only simulate the human brain, but also to build useful applications using these bio-inspired circuits for ultra low power speech processing, image processing, and robotics. This can be achieved using reconfigurable hardware, like field programmable analog arrays (FPAAs), which enable configuring different applications on a cross platform system. As digital systems saturate in terms of power efficiency, this alternate approach has the potential to improve computational efficiency by approximately eight orders of magnitude. These systems, which include analog, digital, and neuromorphic elements combine to result in a very powerful reconfigurable processing machine.
4

Oro srauto parametrų kombaino kūlimo aparate nustatymas / Evaluation of air flow parameters within the threshing apparatus

Karitonas, Tautvydas 21 June 2013 (has links)
Sukamas javų kombaino kūlimo būgnas sukuria oro srautą tarpe tarp būgno ir pobūgnio. Dalis oro nukreipiama pro pobūgnio ardelius. Darbe atlikti oro srauto greičio tarpe tarp kūlimo būgno ir pobūgnio bei pobūgnio ardeliuose tyrimai. Laboratoriniai tyrimai atlikti stacionariu tangentiniu vienbūgniu kūlimo stendu, kurį sudarė 0,6 m skersmens ir 1,2 m pločio aštuonių spragilų tangentinis kūlimo būgnas, kurį 146º kampu gaubė ardelinis pobūgnis. Pateiktos oro srauto greičio tarpe tarp būgno ir pobūgnio bei pobūgnio ardeliuose priklausomybės nuo technologinių ir konstrukcinių kūlimo būgno parametrų. Laboratoriniais tyrimais nustatyta, jog kūlimo būgno konstrukciniai ir technologiniai parametrai sąlygoja būgno sukuriamą oro srautą. Oro srauto greitis didėja pobūgnio galo link. Būgną sukant 350 min-1 dažniu (spragilų linijinis greitis vs=11 m s-1), greičių skirtumas pirmojoje ir trečiojoje pobūgnio dalyse siekia 1 m s-1, o padidinus sukimosi dažnį iki 750 min-1 – apie 3 m s-1. Didinant kūlimo būgno sukimosi dažnį nuo 350 min-1 iki 750 min-1 oro srauto judėjimo greitis tarpe tarp būgno ir pobūgnio bei pobūgnio ardeliuose didėja, tačiau spragilų greičio nepasiekia. Būgno tarpspragiliuose pritvirtinus 8 balastus, oro srauto greitis tarpe tarp būgno ir pobūgnio sumažėjo 10%, o tarpspragilius uždengus dangalais – 37% lyginant su įprastos tarpspragilių konstrukcijos būgnu. Pobūgnio ardeliuose oro srauto greitis atitinkamai sumažėjo 9% ir 33%. Tolimesniais eksperimentiniais tyrimais... [toliau žr. visą tekstą] / The rotation of combine harvester threshing cylinder creates an air flow within threshing crescent, part of which is directed through the openings in the concave. The present work gives the air flow velocity trials within threshing crescent. Experimental studies were carried out with a stationary tangential threshing cylinder stand which consisted of 0.6 m diameter and 1.2 m wide eight rasp bars tangential threshing cylinder which is surrounded by concave with 146º. Air velocity was measured at 56 locations, distributed dependent on construction of concave. The air velocity was measured using a hot wire anemometer unit. The output data was recorded on PC using 10 bit ADC converter. Nine levels of cylinder peripheral speed (from 11.0 ms-1 to 23.6 ms-1) at cylinder-concave clearances of: 36 mm at front, 32 mm in middle, and 20 mm at rear part of concave were used in this experiment. The results of the experiment show that there were significant differences of air velocity among cylinder peripheral speeds and locations. The air velocity increased with increased cylinder peripheral speed and towards the rear of the concave. Air flow velocity within threshing crescent dependence on technological and constructional parameters of the threshing cylinder is presented. Threshing cylinder with mounted 8 ballast and cylinder with covered space between rasp bars creates an air flow, whom velocity was respectively 10% and 37% lower compared with the standard cylinder construction. Air... [to full text]
5

Design and Implementation of an IoT Solution for Vehicle Access Control in Residential Environment

Akinola, Paul January 2019 (has links)
To overcome the hurdles associated with space management and security controls in a housing system, research was projected to study and analyze the necessary factors of accomplishment. Over time, different processes were observed and reviewed to make this a possible deal. Various residents were interviewed on the daily constraints in parking and managing their vehicles within their housing premises. The reported daunting concern was majorly the gate access and personal hunts for the space to keep the individual resident’s cars. Every resident would always have to stop and hoot at the housing gate for the assigned personnel to check and open the gate. While this would waste every resident’s time, the visitors even face more delay often time. Hitherto, car access and parking constraint become a thing of worry that no one would want to engage the housing service anymore. The interest has got dwindled. And to re-awaken the high patronage of the housing system, a gap must be bridged with an immediate solution to space management with a gating system. These were subsequently given a classical thought, while a prototype solution was demonstrated and reviewed with the various residents of some selected housing. This received a high welcoming embracement and was beckoned to be made real by the logical heuristic. At this point, nothing was further considered than using the Internet of things (IoT) technology to implement Vehicular Access Management for the control and integration of intended space provisioning in any housings. Consequently, the number plate of every vehicle becomes the automatic access tag and would be used for security control within the housing location. Vehicles’ numbers would be captured and used to manage the residents passing through the automated gating system. With it, records would be made for all permitted residents and the visitors that own a car. Thus, a proper arrangement would be allotted accordingly, as provisioned by the gating system administrator. However, to allegories the above-proffered solution, this project work is divided into six sections. The introductory section introduces the project rationale, lists the objectives, explores related works, and introduces how IoT and vehicular systems can be merged. The second section delves into these vehicular systems. It introduces the Automatic License Plate Recognition System (ALRP) and the Raspberry Pi and highlights the merits of the Integrated Vehicular Access Security System. Open-CV and machine learning are also introduced. Section three covers the solution design, while section four is the implementation phase. Section five covers the testing and implementation of the solution. The final section summarizes the project. The project successfully models an automated solution for the security of tenants and vehicle users against unauthorized access to residential estates and buildings.

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