Loss of electrons from fast heavy structure ions colliding with atoms

JETP Letters ◽  
2005 ◽  
Vol 82 (7) ◽  
pp. 404-408 ◽  
Author(s):  
V. I. Matveev ◽  
D. U. Matrasulov ◽  
S. V. Ryabchenko
Keyword(s):  
2012 ◽  
Vol 3 (1) ◽  
pp. 63-73 ◽  
Author(s):  
I. Csáky ◽  
F. Kalmár

Abstract Nowadays the facades of newly built buildings have significant glazed surfaces. The solar gains in these buildings can produce discomfort caused by direct solar radiation on the one hand and by the higher indoor air temperature on the other hand. The amplitude of the indoor air temperature variation depends on the glazed area, orientation of the facade and heat storage capacity of the building. This paper presents the results of a simulation, which were made in the Passol Laboratory of University of Debrecen in order to define the internal temperature variation. The simulation proved that the highest amplitudes of the internal temperature are obtained for East orientation of the facade. The upper acceptable limit of the internal air temperature is exceeded for each analyzed orientation: North, South, East, West. Comparing different building structures, according to the obtained results, in case of the heavy structure more cooling hours are obtained, but the energy consumption for cooling is lower.


2021 ◽  
pp. 002085232110588
Author(s):  
Tao Li ◽  
Zhenyu M. Wang

The prevalence of top-heavy bureaucracies in non-democracies cannot be explained by the theories of Parkinson, Tullock, Niskanen, or Simon or by classical managerial theories. When bureaucracy positions carry rents, the competition for promotion becomes a rent-seeking process. Borrowing the career-tournament theory framework from managerial scholarship, we argue that top-heavy bureaucracy resembles a tournament with too many finalists. When rent is centralized at the top (i.e. power centralization), as is the case in many non-democracies, the optimal bureaucracy should be top-heavy, accommodating and encouraging relatively more finalists at the top to compete for the final big prize. We provide suggestive evidence by analyzing ministry organizations in China (1993–2014) and Russia (2002–2015). After some fluctuations, the shape of Russian ministries eventually converged with that of China. In the steady state, their ministry shapes are far more top-heavy than what is prescribed by managerial theories. At the micro-level, ministry power centralization, measured by the perceived influence of the ministers, is correlated with ministry top-heaviness in Russia. Points for practitioners Our theory suggests that a top-heavy authoritarian bureaucratic structure naturally follows from a back-loaded sequential career tournament and an effort-maximizing bureaucratic leader. Our findings also suggest that Chinese and Russian ministries both converge to a highly top-heavy structure in the long run. We demonstrate that the top-heavy structure first arose during the planned-economy experiment in the Soviet Union. Our research sheds new light on public-sector reforms that aim to reduce bureaucracy top-heaviness in autocracies.


Author(s):  
L-J Zhang ◽  
C-M Zhu ◽  
X Shi ◽  
P Zhang

During the heavy structure installation process, any external disturbance may result in a huge impact on the substructure due to the extremely large mass involved, which may damage the whole structure permanently. Therefore, a reliable shock isolator for the installation interface is very important in such applications. In this study, a novel shock isolator based on a hydraulic damper is presented. It has been designed with an optimized throttling orifice to dissipate the energy efficiently and with air bags to store energy. Considering the maximal relative travel range of the isolator within a specified physical limit, the design is formulated as an optimization problem to minimize the peak acceleration during the impact and finalized as a constant force isolator. A mathematical model of the isolator is established and a prediction of its performance is obtained through some simulations. Experiments are performed to evaluate the theoretical model and it is found that the experimental data agree with the theoretical prediction very well, and thus validates the design. The influence of initial oil pressure and the material of elastic impact head are also investigated. The results show that higher initial oil pressure increases the peak acceleration, while the material of the elastic impact head has no significant effect on that.


2010 ◽  
Vol 37 (6) ◽  
pp. 922-926 ◽  
Author(s):  
Jangwoo Seo ◽  
Wi Sung Yoo ◽  
Ung-Kyun Lee ◽  
Chunhak Kim ◽  
Kyung-In Kang ◽  
...  

In recent years, contractors have frequently needed to apply innovative technologies to fulfil architects’ creative and intricate designs. They have often encountered abnormal construction conditions. One of the challenging and difficult process is the lifting of a heavy structure called the sky transfer truss (STT), especially if undertaking such a lift is not prevalently experienced. This can result in hazards, accidents, schedule delays, and financial losses to contractors. Traditionally, this structure is fabricated at elevation using scaffolds; however, this approach is costly, time-consuming, and labour-intensive. We introduce a procedure for lifting a 600 metric ton structure that has been fabricated on the ground with a synchronous hydraulic jack-up system. We also discuss the technical difficulties of integrating such a structure into a housing facility. This note addresses several challenging issues: high-accuracy fabrication, design of preventing interference and deformation, and the development of a construction procedure. The case study may be helpful for the flexible construction of extended designs and for the use of a jack-up system in lifting heavy structures of massive sizes and weights.


1932 ◽  
Vol 12 (1) ◽  
pp. 35-67 ◽  
Author(s):  
J. H. Iliffe

The primary object of the work of 1928 was to follow up the discovery in 1927 of the unexpectedly strong and heavy foundation underlying the north-east corner mound. As a result of this year's work it is evident that this corner mound represents some heavy structure which is best explained as a circular corner tower built into the town walls at their northeast angle; but even its foundations were so broken up that it was impossible to discover any outline or recover a complete ground plan. Oh the outside, instead of extending beyond the walls themselves, the circumference of the structure lay flush with the curved external angle of the walls, while on the inside its circumference projected slightly beyond the angle of the walls proper. It was thus rather an internal than an external tower, a fact which it is important to bear in mind.


2021 ◽  
Vol 21 (10) ◽  
pp. 244
Author(s):  
Li-De Yan ◽  
Fei Zheng ◽  
Xi Rui

Abstract The self-weight of a large fully-steerable radio telescope is one of the important factors affecting its performance. In the existing reflector system scheme, the problem of surface accuracy caused by its large and heavy structure has seriously restricted the application and implementation of large radio telescopes. Therefore, a new mesh structure scheme for a large fully-steerable radio telescope reflector is proposed in this paper. This scheme is based on a homogenized mesh back-up structure in the form of a quasi-geodesic grid and regular quasi-tri-prism or tetrahedron, which can significantly reduce the structural complexity and self-weight of the reflector under the condition that the reflector can meet the desired performance requirements. Finally, the feasibility and rationality of the scheme are evaluated by numerical simulation analysis, which has significant advantages and provides a new design for the reflector of a large fully-steerable radio telescope.


2011 ◽  
Vol 137 ◽  
pp. 392-397
Author(s):  
Guo Jun Zhang ◽  
Yong Gang Tan ◽  
Hong Nan Li

The main bridge of Dalian South Binhai Avenue is a double-decked three-span earth -anchored suspension bridge with a full length of 820m, of which the main span is 460m, and a width of 24.8m. In this paper, the conceptual design of the steel stiffening truss girder, cable tower and anchorage are introduced and the design difficulties and points are analyzed. The anchorage adopts the hollow triangular frame structure, breaking through the physical heavy structure of gravity anchorage; and the design of two wedge-shaped gravel bed foundations improves the anti-slip safety factor of the anchorage. The offshore anchorage program provides a reference for the construction of future similar bridges.


2016 ◽  
Vol 29 (12) ◽  
pp. 4665-4684 ◽  
Author(s):  
Chao-An Chen ◽  
Jia-Yuh Yu ◽  
Chia Chou

Abstract Global-warming-induced changes in regional tropical precipitation are usually associated with changes in the tropical circulation, which is a dynamic contribution. This study focuses on the mechanisms of the dynamic contribution that is related to the partition of shallow convection in tropical convection. To understand changes in tropical circulation and its associated mechanisms, 32 coupled global climate models from CMIP3 and CMIP5 were investigated. The study regions are convection zones with positive precipitation anomalies, where both enhanced and reduced ascending motions are found. Under global warming, an upward-shift structure of ascending motion is observed in the entire domain, implying a deepening of convection and a more stable atmosphere, which leads to a weakening of the tropical circulation. In a more detailed examination, areas with enhanced (weakened) ascending motion are associated with more (less) import of moist static energy by a climatologically bottom-heavy (top heavy) structure of vertical velocity, which is similar to a “rich get richer” mechanism. In a warmer climate, different climatological vertical profiles tend to induce different changes in atmospheric stability: the bottom-heavy (top heavy) structure brings a more (less) unstable condition and is favorable (unfavorable) to the strengthening of the convective circulation. The bottom-heavy structure is associated with shallow convection, while the top-heavy structure is usually related to deep convection. This study suggests a hypothesis and a possible linkage for projecting and understanding future circulation change from the current climate: shallow convection will tend to strengthen tropical circulation and enhance upward motion in a future warmer climate.


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