scholarly journals Experimental Study on the Insulation Layer Thickness of a Novel Ice Coring Device in Loose Sandstone-Type Uranium Deposits

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7448
Author(s):  
Chaoyang Huang ◽  
Jianming Peng ◽  
Yanliang Li ◽  
Moke Lian ◽  
Chao Guo ◽  
...  
Keyword(s):  
Laboratory Experiments ◽  
High Reliability ◽  
Freezing Process ◽  
The Novel ◽  
Uranium Deposits ◽  
Insulation Layer ◽  
Cold Source ◽  
Cold Energy ◽  
Speed Up ◽  
Drill Tool

The target strata of sandstone-type uranium deposits are usually located in the fragile and loose strata, which makes it difficult to obtain core samples; consequently, a novel ice coring device for loose sandstone-type uranium deposits is proposed to solve this problem. Experiments proved that the artificial sample can replace the natural sample, and the coring method has high reliability. Ensuring the allegro formation of an ice valve with a given cold source is critical for this coring system, and reducing the loss of cold energy with help of insulation layer is one of the methods to speed up the formation of ice valve. Since the diameter of the drill tool is limited by its working scenario, the thickness of insulation layer is limited to ensure the size of core. Therefore, this paper conducted laboratory experiments of the insulation layer with different thicknesses to study the effect of the insulation layer on the formation of the sand–ice valve. Results show that the insulation layer can reduce the loss of cold energy during the freezing process and significantly affect the formation time of the sand–ice valve. When the thickness of the aerogel insulation layer is 2 mm, the freezing time is 44% shorter than that without insulation layer. According to the tests, the novel ice coring device is expected to solve the coring problem in loose sandstone-type uranium deposits.

Dispersal of the sugar-cane scale Aulacaspis tegalensis (Zhnt.) (Hem., Diaspididae) by air currents

1972 ◽  
Vol 61 (3) ◽  
pp. 547-558 ◽  
Author(s):  
D. J. Greathead
Keyword(s):  
Sugar Cane ◽  
Laboratory Experiments ◽  
Sticky Trap ◽  
Research Station ◽  
High Humidity ◽  
Dispersal Mechanism ◽  
Large Numbers ◽  
Speed Up ◽  
Trap Catches ◽  
Aulacaspis Tegalensis

By means of sticky traps and a suction trap, it was demonstrated on a plot of sugar-cane at Kawanda Research Station, Uganda, that large numbers of crawlers of Aulacaspis tegalensis (Zhnt.) become airborne (up to 10/m3). The numbers increase with wind speed up to about 2·0 m/s and then remain constant, but are depressed by increasing humidity. In laboratory experiments, crawler survival was reduced by high temperatures (30°C) and low humidities (30% r.h.), but some individuals should survive the extreme conditions sometimes experienced if airborne from morning until evening. On hatching, crawlers move upwards and towards the light, but downwards in the dark; movement is inhibited by high humidity. These behaviour responses indicate hat the presence of crawlers in the air is not accidental but a dispersal mechanism. At Arusha Chini, an isolated sugar estate in Tanzania, sticky-trap catches downwind of a windbreak confirmed that airborne dispersal of crawlers is a major source of infestation. It is shown that air currents could have carried crawlers to Arusha Chini from a source on the Kenya coast, 260 km to the east.

scholarly journals Deep Reinforcement Learning Approach with Multiple Experience Pools for UAV’s Autonomous Motion Planning in Complex Unknown Environments

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1890 ◽  
Author(s):  
Zijian Hu ◽  
Kaifang Wan ◽  
Xiaoguang Gao ◽  
Yiwei Zhai ◽  
Qianglong Wang
Keyword(s):  
Reinforcement Learning ◽  
Motion Planning ◽  
Predictive Control ◽  
Experimental Testing ◽  
The Novel ◽  
Simulation Environment ◽  
Unknown Environments ◽  
Autonomous Motion ◽  
Policy Gradient ◽  
Speed Up

Autonomous motion planning (AMP) of unmanned aerial vehicles (UAVs) is aimed at enabling a UAV to safely fly to the target without human intervention. Recently, several emerging deep reinforcement learning (DRL) methods have been employed to address the AMP problem in some simplified environments, and these methods have yielded good results. This paper proposes a multiple experience pools (MEPs) framework leveraging human expert experiences for DRL to speed up the learning process. Based on the deep deterministic policy gradient (DDPG) algorithm, a MEP–DDPG algorithm was designed using model predictive control and simulated annealing to generate expert experiences. On applying this algorithm to a complex unknown simulation environment constructed based on the parameters of the real UAV, the training experiment results showed that the novel DRL algorithm resulted in a performance improvement exceeding 20% as compared with the state-of-the-art DDPG. The results of the experimental testing indicate that UAVs trained using MEP–DDPG can stably complete a variety of tasks in complex, unknown environments.

scholarly journals Towards sustainable landscape irrigation using novel design of water collecting systems from atmospheric humidity condensation

2021 ◽  
Author(s):  
zaid aldeek
Keyword(s):  
Urban Landscape ◽  
The Novel ◽  
Atmospheric Humidity ◽  
Poor Countries ◽  
Speed Up ◽  
Simple Technology ◽  
Sustainable Irrigation ◽  
Sustainable Landscape ◽  
Vertical Greening ◽  
Novel Design

Abstract The paper proposes an innovative improvement to the water collectors from atmospheric humidity condensation by introducing non-hydrophobic substances to speed up the water condensation and the dropping off process using simple technology, inexpensive and with high quality materials with the finality to favor sustainable irrigation in regions characterized by water resources scarcity favoring greening generally. The innovative collector’ design and experimentation conduced confirm the possibility to collect water from air humidity in different regions with reduced rain days as semi desertic zones enhancing the gain of desertification process, harvesting water in urban landscape, in vertical greening and roof gardens. The first principal innovative aspect of the novel design collector is the fast capacity of condensation caused from the method of design of the used materials and fast capacity of releasing water collected to contrast the undesired evaporations. The second innovative aspect is the reduced volume to permit a diffused and unexpensive implants which can be distribute suitably on the targeted landscape. Reduced costs and simplicity of fabrication announce real possibility of use in underdeveloped and poor countries to increase vegetation diffusion firstly and contributing on sustainable agriculture and architecture.

On the experimental lead-cooled installation

2020 ◽  
pp. 185-192
Author(s):  
N. V. Aleksandrov ◽  
Ye. D. Blank ◽  
A. D. Kashtanov ◽  
V. V. Stepanov ◽  
V. V. Lemekhov ◽  
...  
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
High Efficiency ◽  
High Reliability ◽  
Liquid Lead ◽  
Extensive Experience ◽  
Technical Parameters ◽  
Large Structures ◽  
Speed Up ◽  
Coolant Circulation

Extensive experience in operating nuclear power plants convincingly proves that fast liquid metal cooled reactors are among the most promising. The advantages of using liquid lead coolants in nuclear power industry are shown. In Russia, lately, much attention has been paid to the natural safety of fast reactors. At the stage of testing materials for components of reactor plants, a number of problems arose for basic systems. An experimental lead-cooled installation was developed for testing large structures, continuous monitoring and maintaining specified technical parameters. For reliable coolant circulation (lead coolant circulation speed up to 200 kg/s), a magnetohydrodynamic pump (MHD pump) has been developed, which is distinguished by high efficiency and reliability, it is also ease in operation and maintenance. Currently, the experimental setup is successfully used in scientific research of materials for RU BREST-OD-300. All its systems showed high reliability, maintainability and the possibility of further modernization.

scholarly journals A Versatile Setup for Measuring Multiple Behavior Endpoints in Zebrafish

Inventions ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 75 ◽  
Author(s):  
Gilbert Audira ◽  
Bonifasius Sampurna ◽  
Stevhen Juniardi ◽  
Sung-Tzu Liang ◽  
Yu-Heng Lai ◽  
...  
Keyword(s):  
Open Source Software ◽  
High Reliability ◽  
Cost Effective ◽  
Behavioral Changes ◽  
Behavioral Performance ◽  
The Novel ◽  
Fish Locomotion ◽  
Anxiogenic Effect ◽  
First Time ◽  
Low Dosage

The measurement of multiple behavior endpoints in zebrafish can provide informative clues within neurobehavioral field. However, multiple behavior evaluations usually require complicated and costly instrumental settings. Here, we reported a versatile setting that applied ten acrylic tanks arranging into five vertical layers and two horizontal columns to perform multiple behavior assays simultaneously, such as the novel tank diving test, mirror-biting test, social interaction, shoaling, and predator escape assay. In total, ten behavioral performance were collected in a single video, and the XY coordination of fish locomotion can be tracked by using open source software of idTracker and ImageJ. We validated our setting by examining zebrafish behavioral changes after exposure to low dose ethanol (EtOH) for 96 h. Fish were observed staying longer time at bottom of the tank, less mirror biting interest, higher freezing time, less fear in predator test, and tight shoaling behaviors which indicated the anxiogenic effect was induced by low dosage exposure of EtOH in zebrafish. In conclusion, the setting in this study provided a simple, versatile and cost-effective way to assess multiple behavioral endpoints in zebrafish with high reliability and reproducibility for the first time.

scholarly journals A Secure Algorithm for Inversion Modulo 2k

Cryptography ◽  
2018 ◽  
Vol 2 (3) ◽  
pp. 23
Author(s):  
Sadiel de la Fe ◽  
Carles Ferrer
Keyword(s):  
Security Analysis ◽  
Side Channel ◽  
The Novel ◽  
Montgomery Multiplication ◽  
Side Channel Analysis ◽  
Original Algorithm ◽  
Modulo P ◽  
Speed Up ◽  
Novel Method ◽  
Channel Analysis

Modular inversions are widely employed in public key crypto-systems, and it is known that they imply a bottleneck due to the expensive computation. Recently, a new algorithm for inversions modulo p k was proposed, which may speed up the calculation of a modulus dependent quantity used in the Montgomery multiplication. The original algorithm lacks security countermeasures; thus, a straightforward implementation may expose the input. This is an issue if that input is a secret. In the RSA-CRT signature using Montgomery multiplication, the moduli are secrets (primes p and q). Therefore, the moduli dependent quantities related to p and q must be securely computed. This paper presents a security analysis of the novel method considering that it might be used to compute secrets. We demonstrate that a Side Channel Analysis leads to disclose the data being manipulated. In consequence, a secure variant for inversions modulo 2 k is proposed, through the application of two known countermeasures. In terms of performance, the secure variant is still comparable with the original one.

A Novel Overhead Ground Wire with Winded Insulated Conductors for Ice-Melting

2012 ◽  
Vol 614-615 ◽  
pp. 1168-1171
Author(s):  
Jia Zheng Lu ◽  
Chun Zhao ◽  
Bo Li ◽  
Zhen Fang ◽  
Hong Xian Zhang
Keyword(s):  
Engineering Application ◽  
Galvanized Steel ◽  
Economic Power ◽  
The Novel ◽  
Ice Melting ◽  
Insulation Layer ◽  
Effective Power ◽  
Steel Wires ◽  
The Wire ◽  
Melting Experiments

Serious icing on overhead ground wires threatens the safe running of power system. Common overhead ground wires are difficult to realize ice-melting. A novel overhead ground wire structure for ice-melting is proposed. Some conductors coated with insulation layer are winded around the galvanized steel wires in a special way. Ice-melting experiments are performed on the novel overhead ground wire. Experimental results show that 30 W per meter of the wire is an economic power while 40 W per meter of the wire is an effective power for ice-melting. Engineering application of the novel overhead ground wire with insulated conductors is carried out. With the light moveable de-icer, onsite experiment is performed. Under the power of 40 W per meter of the wire, a temperature rise of 10 °C is achieved in 30 minutes. The result shows that the novel overhead ground wire can meet the demands of engineering application.

Heat and Mass Coupled Transfer Combined with Freezing Process in Building Exterior Envelope

2011 ◽  
Vol 71-78 ◽  
pp. 3385-3388
Author(s):  
Fan Hong Kong ◽  
Huai Zhu Wang ◽  
Qun Li Zhang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Building Envelope ◽  
Cold Climate ◽  
Freezing Process ◽  
First Year ◽  
Insulation Layer ◽  
Cold Area ◽  
Ice Content

In severe cold area, the exterior layers of envelope usually experience seasonal freezing /thawing due to cold climate in winter. However, it can lead to severe problems especially in the newly-completed building. In order to analyze the drying of envelope on building initial use, the heat and moisture coupled transfer of building envelope in severe cold area Harbin, China was simulated with the modeling method developed. The modeled result was analyzed. It is concluded that the drying rate of the newly-completed building envelope is significantly high in the first year, especially in the first few months. Insulation performance of the wall in the first winter is most serious due to the high initial moisture and freezing ice content in insulation layer. For the simulated envelope, the freezing of the moisture content especially that in insulation layer had notable effect on heat transfer coefficient (thermal resistance), and the maximum of heat transfer coefficient of the modeled envelope in the first year winter is about 7% higher than that in the tenth year, which is taken as final hygral state.

scholarly journals Evolutionary Game Analysis of Government and Enterprises Carbon-Reduction based on Public Willingness

2021 ◽  
Author(s):  
Guochang Fang ◽  
Yu He ◽  
Lixin Tian
Keyword(s):  
Evolutionary Game ◽  
The Novel ◽  
Game Analysis ◽  
Carbon Reduction ◽  
State Action ◽  
Evolution Path ◽  
Economic Interpretation ◽  
Passive Strategies ◽  
Speed Up ◽  
Government Enterprise

Abstract This paper explores the evolutionary game of government and enterprises carbon-reduction with public willingness constraints. On the basis of the features of government and enterprises in energy saving and emission reduction system, the novel evolutionary game model is constructed. The effects of behavioral strategy and willingness constraint strength are visualized by system dynamics theory. With the aid of these visual indicators, the varying dynamic evolution path under different situations is put forward. The economic interpretation of evolutionary stable strategies is discussed. The results show that, public willingness can promote government-enterprise to achieve the optimal state (action, carbon-reduction) spontaneously. The initial willingness can speed up the convergence rate of these two players’ behaviors. The residents’ willingness further restrains the behaviors of government and enterprises, which can eliminate the possibility of adopting passive strategies and reduce the lag of strategies for both parties.

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