Adaptive Response in Mice Exposed to 900 MHz Radiofrequency Fields: Primary DNA Damage

The phenomenon of adaptive response (AR) in animal and human cells exposed to ionizing radiation is well documented in scientific literature. We have examined whether such AR could be induced in mice exposed to non-ionizing radiofrequency fields (RF) used for wireless communications. Mice were pre-exposed to 900 MHz RF at 120 µW/cm2 power density for 4 hours/day for 1, 3, 5, 7 and 14 days and then subjected to an acute dose of 3 Gy γ-radiation. The primary DNA damage in the form of alkali labile base damage and single strand breaks in the DNA of peripheral blood leukocytes was determined using the alkaline comet assay. The results indicated that the extent of damage in mice which were pre-exposed to RF for 1 day and then subjected to γ-radiation was similar and not significantly different from those exposed to γ-radiation alone. However, mice which were pre-exposed to RF for 3, 5, 7 and 14 days showed progressively decreased damage and was significantly different from those exposed to γ-radiation alone. Thus, the data indicated that RF pre-exposure is capable of inducing AR and suggested that the pre-exposure for more than 4 hours for 1 day is necessary to elicit such AR

Obstacle avoidance of unmanned ship swarm based on virtual navigator and improved Hooke's law

ObjectiveAiming at the obstacle avoidance of unmanned ship swarm, this paper proposes an elastic formation control method based on a virtual navigator and improved Hooke's law.MethodsFirst, the external ellipse is obtained according to the length and width of the obstacle, and the virtual obstacle avoidance area, obstacle avoidance response area and free navigation area are then extended outward according to the aspect ratio in order to simplify obstacle avoidance on the surface of the water. Second, based on the virtual navigator and improved Hooke's law, the constraints on relative distance and speed between each members of the formation as well as those between each members of the formation and the virtual navigator are given, and the formation configuration of the multiple unmanned ships is set in the form of coordinates so as to construct an elastic formation model. Further, based on the obstacle annular repulsive field, the obstacle avoidance of a single unmanned ship is realized. The obstacle avoidance of the multiple unmanned ships can then be realized under the organization of the elastic formation. Moreover, the sailing process of unmanned ship is optimized to eliminate the phenomena of "wandering" and "shaking" in the process of formation and obstacle avoidance, and increase the smoothness of the movement of the unmanned ship. Finally, four unmanned ships are used to form a formation, and a simulation experiment based on Matlab is carried out.ResultThe results show that all obstacles are successfully bypassed, verifying the effectiveness and feasibility of the proposed method. ConclusionsThis method can achieve the avoidance of surface obstacles for unmanned ship swarms, giving them a certain ability to pass through complex environments, thereby providing references for the application and research of unmanned ship swarm obstacle avoidance

Adsorption Desulphurization of Gasoline by Silver Loaded onto Modified Activated Carbons

The removal of organosulphur from gasoline by adsorption onto commercial carbon samples loaded with different amounts of silver nitrate was investigated. The pore structures of the samples were characterized by nitrogen adsorption studies, while the structure and chemical property of the samples before and after adsorption were examined and analyzed by XRD, FT-IR and SEM methods, respectively. The results showed that silver formed π-complexes with organic sulphides; the higher the silver loading, the greater the amount adsorbed. However, the adsorption selectivity was poor

DMNR: Unsupervised De-noising of Point Clouds Corrupted by Airborne Particles

LiDAR sensors are critical for autonomous driving and robotics applications due to their ability to provide accurate range measurements and their robustness to lighting conditions. However, airborne particles, such as fog, rain, snow, and dust, will degrade its performance and it is inevitable to encounter these inclement environmental conditions outdoors. It would be a straightforward approach to remove them by supervised semantic segmentation. But annotating these particles point wisely is too laborious. To address this problem and enhance the perception under inclement conditions, we develop two dynamic filtering methods called Dynamic Multi-threshold Noise Removal (DMNR) and DMNR-H by accurate analysis of the position distribution and intensity characteristics of noisy points and clean points on publicly available WADS and DENSE datasets. Both DMNR and DMNR-H outperform state-of-the-art unsupervised methods by a significant margin on the two datasets and are slightly better than supervised deep learning-based methods. Furthermore, our methods are more robust to different LiDAR sensors and airborne particles, such as snow and fog.Comment: 8 pages, 6 figures, 15 references, submitted pape

Design and Test of a Straw-Clearing-Depth Self-Adaptive Control System of a Front-Mounted Seedbed-Preparation Device

In northeast China, most seedbed-preparation devices use the ground-wheel profiling method to ensure their operational stability. However, during the wide-width operation of the front-mounted seedbed-preparation device, the poor trafficability characteristics and the low profiling accuracy of the ground-wheel profiling mechanism result in unstable straw clearing depth, poor straw clearing quality, and the low operational efficiency of the seedbed-preparation device. In order to solve the above problems, a straw-clearing-depth self-adaptive control system of a front-mounted seedbed-preparation device was designed. The key structural design of the self-adaptive control system was completed through theoretical analysis. The performance test results of the self-adaptive control system showed that the lifting speed of the front-suspension mechanism was greater than 0.2 m/s in the manual button control mode, and the relative error between the target value and the actual value of the straw clearing depth was 10.8% under the self-adaptive profiling control mode. The three-factor and five-level quadratic regression orthogonal rotation center combination test method was adopted to conduct a parameter combination optimization test, with the machine operation speed, the operation depth of the straw clearing knife, and the straw covering amount as test factors, and the straw clearing rate, the qualified rate of operation depth, and the consistency of straw clearing between rows as evaluation indices. The results indicated that when the machine operation speed was 5~8.8 km/h, the operation depth of the straw clearing knife was 50 mm, the straw covering amount was 0.9~1.44 kg/m2, the straw clearing rate was ≥86%, the qualified rate of operation depth was ≥86%, and the consistency of straw clearing between rows was ≥83%. Field tests were carried out on the machine using operation speeds of 5 km/h, 6 km/h, 7 km/h, and 8 km/h under the conditions of an operation depth of the straw clearing knife of 50 mm and a straw covering amount of 1.2 kg/m2. The results showed that the straw clearing rate, the qualified rate of operation depth, and the consistency of straw clearing between rows were all within the optimized range under different machine operation speeds, which was basically consistent with the optimized results

Data from: Haplodeficiency of diabetes-associated gene GLIS3 impairs insulin sensitivity in male mice

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Primary DNA damage, comet tail length and tail moment, in peripheral blood leukocytes of mice in different experimental groups.

<p>Number of animals in each group - 5. Data are Mean+/−Standard Deviation.</p><p>*No RF exposure. 3 Gy γ-radiation (GR) exposure is acute on days 1, 3, 5, 7 and 14 days.</p><p>**Expected values are the sum of two individual treatments (GR alone+RF alone) minus controls.</p

Correlation between % apoptosis and intracellular free Ca²⁺ levels in HL-60 cells.

<p>Correlation between % apoptosis and intracellular free Ca²⁺ levels in HL-60 cells.</p