568 research outputs found
Importance of Soil Quality in Environment Protection
Soil quality can be characterised by the harmony between it’s physical and biological state and the fertility. From the practical crop production viewpoint, some important contrasting factors of soil quality are: (1) soil looseness – compaction; (2) aggregation – clod and dust formation; friable structure – smeared or cracked structure; (3) organic material: conservation – decrease; (4) soil moisture: conservation – loss; water transmission – water-logging; (5) at least soil condition as a result of the long term ef ect of land use moderates or strengthens climatic harm. In our long-term research project practical soil
quality factors were examined in arable i eld and experimental conditions.
We state that prevention of the soil quality deterioration can be done by the developing and maintaining harmony between land use and environment. Elements of the soil quality conditions such as looseness, aggregation,
workability, organic matter, water transport are examined and the improving methods are suggested. Tillage and production factors which can be adopted to alleviate the harmful climatic impacts are also summarised
Autonomous Applied Robotics: Ultrasound-Based Robot-Assisted Needle Insertion System Concept and Development
Ultrasound (US) is a popular imaging modality for image-guided minimally invasive surgery (MIS), enabling the faster and more reliable execution of numerous procedures, such as biopsy, electrode placement and vessel cannulation. Blood vessel cannulation is a common, routine intervention, e.g., for blood oxygen level testing. Yet, in particular cases, when the vessel is located deep or veins less stable (with the loss of subcutaneous tissue), it is hard to complete it without US assistance. In this paper, we present a solution for US-guided, robot-assisted needle insertion for vein cannulation. We developed an image-guided system to aid needle insertion via active targeting and anatomy-relevant positioning, together with safeguarding features, such as a kinematically enforced Remote Center of Motion (RCM) mechanism. The proposed system comprises a portable US transducer mounted on a KUKA iiwa collaborative robot, a custom designed needle insertion mechanism with adjacent controllers. The US and needle insertion mechanism are attached to the robot through a 3D printed custom designed mounting part with integrated force sensor. The robot arm is responsible for moving the needle to target position with impedance control. The needle insertion mechanism allows the manipulation of the needle along 3 axes. The mechanism was designed for near-surface vein cannulation with an RCM kinematic structure to avoid damage to the vein. The developed system was tested with different types of gelatin phantoms. Vein deformation and tissue motion was examined during US imaging. The control loop of our system is supplemented with vein deformation tissue model and US-based visual servoing
Constraining Big Bang lithium production with recent solar neutrino data
The 3He({\alpha},{\gamma})7Be reaction affects not only the production of 7Li
in Big Bang nucleosynthesis, but also the fluxes of 7Be and 8B neutrinos from
the Sun. This double role is exploited here to constrain the former by the
latter. A number of recent experiments on 3He({\alpha},{\gamma})7Be provide
precise cross section data at E = 0.5-1.0 MeV center-of-mass energy. However,
there is a scarcity of precise data at Big Bang energies, 0.1-0.5 MeV, and
below. This problem can be alleviated, based on precisely calibrated 7Be and 8B
neutrino fluxes from the Sun that are now available, assuming the neutrino
flavour oscillation framework to be correct. These fluxes and the standard
solar model are used here to determine the 3He(alpha,gamma)7Be astrophysical
S-factor at the solar Gamow peak, S(23+6-5 keV) = 0.548+/-0.054 keVb. This new
data point is then included in a re-evaluation of the 3He({\alpha},{\gamma})7Be
S-factor at Big Bang energies, following an approach recently developed for
this reaction in the context of solar fusion studies. The re-evaluated S-factor
curve is then used to re-determine the 3He({\alpha},{\gamma})7Be thermonuclear
reaction rate at Big Bang energies. The predicted primordial lithium abundance
is 7Li/H = 5.0e-10, far higher than the Spite plateau.Comment: Final accepted version, some typos corrected, in the press at Phys.
Rev.
Infrastructural Requirements and Regulatory Challenges of a Sustainable Urban Air Mobility Ecosystem
The United Nations has long put on the discussion agenda the sustainability
challenges of ur- banization, which have both direct and indirect effects on
future regulation strategies. Undoubtedly, most initiatives target better
quality of life, improved access to services & goods and environment pro-
tection. As commercial aerial urban transportation may become a feasible
research goal in the near future, the connection possibilities between cities
and regions scale up. It is expected that the growing number of vertical
takeoff & landing vehicles used for passenger and goods transportation will
change the infrastructure of the cities, and will have a significant effect on
the cityscapes as well. In addition to the widely discussed regulatory and
safety issues, the introduction of elevated traffic also raises environmental
concerns, which influences the existing and required service and control
infrastructure, and thus significantly affects sustainability. This paper
provides narrated overview of the most common aspects of safety, licensing and
regulations for passenger vertical takeoff & landing vehicles, and highlights
the most important aspects of infrastructure planning, design and operation,
which should be taken into account to maintain and efficiently operate this new
way of transportation, leading to a sustainable urban air mobility ecosystem
Az „Idegbizottság” szerepe a homoszexualitás magyarországi dekriminalizációjában
Tanulmányunkban a másként „megoldhatatlannak” tűnő társadalmi kérdések medikalizációjának menetét illusztráljuk egy 20. századi magyarországi történeti példán keresztül: a homoszexuális cselekmények 1961-es magyarországi dekriminalizációjának hátterét vizsgáljuk meg 1958-ból származó, korábban ismeretlen levéltári források fényében
Network Protocol Analyzer
Bakalářská práce popisuje implementaci síťového analyzátoru spolu s přehledným grafickým webovým rozhraním. Síťový analyzátor zachycuje síťový provoz a umožňuje jeho podrobný rozbor. Jeho hlavním úkolem je sledování datových toků a identifikace protokolů na aplikační vrstvě modelu TCP/IP, které spojení využívalo. Práce popisuje dvě možnosti identifikace aplikačních protokolů a to na základě čísla portu a obsahu payloadu TCP paketu/UDP datagramu. Webové rozhraní poskytuje statistický přehled nad výstupnými hodnotami síťového analyzátoru.Bachelor's thesis describes an implementation of a network analyzer with an easy graphical web interface. Network Analyzer captures network communication and allows the detailed analysis. Its main task is to monitor data flows and identify protocols, which are situated on application-layer model TCP / IP. Thesis describes two types of possible identification of application protocols, which are based on the port number and the payload content TCP packet / UDP datagram. Web interface provides an overview of the output values of the network analyzer.
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