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Journal articles on the topic 'Blocking angle'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Sun, Jinhai, Yong-Qiang Liu, Jining Li, et al. "Flexible Metamaterial Quarter-Wave Plate and Its Application in Blocking the Backward Reflection of Terahertz Waves." Nanomaterials 13, no. 7 (2023): 1279. http://dx.doi.org/10.3390/nano13071279.

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A terahertz flexible metamaterial quarter-wave plate (QWP) is designed and fabricated using polyimide as the substrate in this paper, with a 3 dB axial ratio bandwidth of 0.51 THz and high polarization conversion efficiency and transmittance. The effect of the incidence angle on the polarization conversion performance of the QWP is discussed by measuring the transmissions at multiple incidence angles. The blocking effect of this QWP combined with a polarizer on the backward reflection of terahertz waves is investigated by terahertz time-domain spectral transmission experiments. By adjusting th

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2

Song, Zhi, Yunxin Zhan, Yanni Chen, and Gang Fan. "Field physical model tests on the mechanism of river blocking by debris flow in the middle reaches of the Dadu River, Southwest China." PLOS ONE 19, no. 4 (2024): e0298076. http://dx.doi.org/10.1371/journal.pone.0298076.

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Debris flow is a typical natural disaster in the middle reaches of the Dadu River, Southwest China. Field physical model tests were conducted to reveal the mechanism of river blocking by debris flow in the middle reaches of the Dadu River. The dynamic processes of riHver blocking by debris flows were revealed, and based on which three typical river-blocking modes of debris flow are observed, i.e. thrust-type river blocking, mixed-flow-type river blocking and progressive river blocking. The test results showed that the material composition of debris flows plays an important role in the river-bl

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3

Yamshchikov, O. N., D. A. Markov, S. A. Emelyanov, K. P. Zvereva, and A. E. Bychkov. "Comparative analysis of modeled femoral fractures osteosynthesis stability." Kazan medical journal 95, no. 3 (2014): 392–94. http://dx.doi.org/10.17816/kmj1522.

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Aim. To perform the comparative analysis of osteosynthesis stability in splintered fractures on the example of modeled fractures of femur with metalwork. Methods. Bone fragments fixation methods using internal fixators, blocking intramedullary nails, external fixation devices. Round wooden rod with external diameter of 35 mm, internal diameter of 25 mm, which was saw in the middle with two cuts directed at an angle of 45° to the rod axis to form the triangle fragment, was picked for femur model for the purpose of experiment. The stability of bone fragments fixation using plates with angle stab

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4

Ma, Jun, Chenglong Wang, and Yangjun Xia. "Research on Analysis Method of Shading and Blocking of LFR Field." E3S Web of Conferences 118 (2019): 03041. http://dx.doi.org/10.1051/e3sconf/201911803041.

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Shading and blocking problem is the main element restricting efficiency of a LFR system. The traditional analysis methods often need to build the models by using SolTrace, which results in the low efficiency. According to characteristics of single axis tracking of the LFR field, a plane right-angle coordinate system was established, and coordinate equations of reflectors at any time were deduced. Lengths of shading and blocking were got by tracking sun rays which fell on the reflectors and reflected the receiver passing through the adjacent reflector endpoints at any time. Offset caused by the

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5

Guk, Hye-Ran, and Seo-Heui Kim. "The Change of Two Block Cuts by Blocking Location." Journal of the Korean Society of Cosmetology 28, no. 3 (2022): 509–17. http://dx.doi.org/10.52660/jksc.2022.28.3.509.

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This study is a female haircut work applying two blocks that are popular as male cut in the hair beauty industry. The point points of the block were divided into three areas: Goldenback Medium Point, Back Point, and Back Medium Point. The point starting point was named as the top, and parallel line, A line, V line, right angle distribution, natural distribution, natural angle of treatment 0, and onelining cut were performed. The lower part of the head was named as the lower part, and the head angle was cut at 30 degrees and the gradation. The cut start started from the point of the nape point,

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6

Jana, Sourita, Debasis Samanta, Mir Muhammad Fahad, Sellamuthu N. Jaisankar, and Hongdoo Kim. "Blocking and Deblocking of Diisocyanate to Synthesize Polyurethanes." Polymers 13, no. 17 (2021): 2875. http://dx.doi.org/10.3390/polym13172875.

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Diisocyanates, particularly toluene diisocyanate (TDI), are useful for the preparation of various polyurethanes with specific applications as leather-like materials, adhesives and insoles, etc. Blocking agents can be used for the operational simplicity and to reduce the hazards of TDI. In this paper, we reported the use of 3-(4-bromo-phenyl)-1H-pyrazole to block toluene diisocyanate (TDI). FTIR, NMR, thermogravimetric analysis, contact angle analysis and differential scanning calorimetry (DSC) were used for the characterization. The effectiveness of the blocking was confirmed by spectroscopic

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7

Alazwari, Mashhour A., and Mohammad Reza Safaei. "Combination Effect of Baffle Arrangement and Hybrid Nanofluid on Thermal Performance of a Shell and Tube Heat Exchanger Using 3-D Homogeneous Mixture Model." Mathematics 9, no. 8 (2021): 881. http://dx.doi.org/10.3390/math9080881.

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In this study, thermal performance and flow characteristics of a shell and tube heat exchanger equipped with various baffle angles were studied. The heat exchanger was operated with distilled water, and a hybrid nanofluid at three concentrations of 0.04% and 0.10% of GNP-Ag/water within Reynolds numbers ranged between 10,000 and 20,000. The thermophysical properties of nanofluid varied with temperature and nanoparticles’ concentration. The baffle angles were set at 45°, 90°, 135°, and 180°. Results showed that the calculated Nusselt number (Nu) could be improved by adding nanoparticles to the

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8

Kojima, Kazutoshi, Sachiko Ito, Junji Senzaki, and Hajime Okumura. "4H-SiC Homoepitaxial Growth on Vicinal-Off Angled Si-Face Substrate." Materials Science Forum 645-648 (April 2010): 99–102. http://dx.doi.org/10.4028/www.scientific.net/msf.645-648.99.

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We have carried out detailed investigations of 4H-SiC homoepitaxial growth on vicinal off-angled Si-face substrates. We found that the surface morphology of the substrate just after in-situ H2 etching was also affected by the value of the vicinal-off angle. Growth conditions consisting of a low C/Si ratio and a low growth temperature were effective in suppressing macro step bunching at the grown epilayer surface. We also demonstrated epitaxial growth without step bunching on a 2-inch 4H-SiC Si-face substrate with a vicinal off angle of 0.79o. Ni Schottky barrier diodes fabricated on an as-grow

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9

Huang, Bing. "The Value and Application of Personalized Needle Modification in Percutaneous Infrazygomatic Radiofrequency in Isolated Maxillary Nerve Pain through the Foramen Rotundum." Pain Physician 4, no. 22;4 (2019): 377–89. http://dx.doi.org/10.36076/ppj/2019.22.377.

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Background: Percutaneous infrazygomatic radiofrequency (PIR) is a common approach used to block isolated maxillary nerve (V2) pain through the foramen rotundum (FR) in patients with trigeminal neuralgia (TN). Nevertheless, when using this method, there is a risk of accidental penetration of the superior orbital fissure (SOF) and the optic canal (OC) that may result in the injury of the vessels and nerves in that area, and in some severe cases may lead to blindness. According to the blocking of the external orifice of the FR and whether a curved needle was used, combined angle deviation from th

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10

Gao, Xing, Liang Li, Longyang Pan, et al. "Experimental Study on Diversion Dike to Mitigate Debris Flow Blocking River Disaster." Water 17, no. 12 (2025): 1736. https://doi.org/10.3390/w17121736.

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Barrier lakes formed by debris flows blocking rivers can burst rapidly, posing significant threats to downstream areas. Mitigating the risk of barrier lake breaches caused by debris flow blockages is crucial for ensuring safety in affected regions. This study employed physical experiments to investigate the influence of connection angles between the main flume and the tributary flume, as well as the installation of diversion dikes, on the morphological characteristics of debris flow deposits and the resulting barrier lake breach behavior. The findings reveal that when the debris flow enters th

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11

Li, Fei, Weiqiang Zheng, Liping Zhang, Haifeng Wang, and Zehui Wang. "Optimization Study on the Design Parameters of Sand Barriers along the Hami-Lop Nor Railway Line." Sustainability 15, no. 6 (2023): 5297. http://dx.doi.org/10.3390/su15065297.

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In order to solve the current problems of the single effect of traditional sand control measures, the high cost of cleaning and maintenance, and the inability to provide long-term sustainable protection, this paper proposes a new type of sand barrier with the dual effect of sand conduction and sand blocking. Through field research of wind and sand disasters along the Hami-Lop Nor Railway, wind tunnel testing and numerical simulation of the new sand barrier, the wind velocity flow field, wind speed variation curve, wind protection effectiveness and sand barrier retention rate of the new sand ba

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12

Zhu, Awei, Chengtao Xu, Yanfen Liu, Jiasheng Wang, and Xiaodong Tan. "Design and Experiment of Oblique Stubble-Cutting Side-Throwing Anti-Blocking Device for No-Tillage Seeder." Agriculture 14, no. 12 (2024): 2250. https://doi.org/10.3390/agriculture14122250.

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Aiming at the problem of the wheat straw and stubble of the previous crop blocking the opener during the operation of the summer peanut no-tillage seeder under straw incorporation modes, an oblique stubble-cutting and side-throwing anti-blocking device that can simultaneously cut the stubble and throw the straw was designed. The structure and working principle of the device were clarified, and the key structure of the anti-blocking device was designed through theoretical analysis. According to the kinematics analysis of the rotary blade cutting and throwing of the root–soil composite, the key

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13

Zhu, Q., G. Jiang, and X. Qi. "Experimental study on a novel wettability alteration agent in tight sandstone gas reservoir." SOCAR Proceedings, no. 4 (December 30, 2015): 4–11. http://dx.doi.org/10.5510/ogp20150400255.

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This paper introduces a hydrophobic wettability alteration agent named FCS that effectively eliminates «water blocking» by forming a tight molecular film on the sandstone surface. Wettability alteration experiments show that a tight molecular film forms, making it hydrophobic with a contact angle greater than 90°. The inner wall of a capillary tube after FCS treatment changes from liquidwetting to gas-wetting, and the capillary pressure becomes a positive driving force. Experimental study demonstrates that altering wettability of tight sandstone to produce a hydrophobic surface is a viable met

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14

Wang, Shuo Liang, Yang Ming Liao, and Huang Chang Xie. "Fractured Reservoir Blocking Dosage Calculation Method." Applied Mechanics and Materials 268-270 (December 2012): 772–75. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.772.

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Fractured reservoir development process are often faced with the angle wells flooded serious and side wells don’t get the effect of water injection. In order to increase the water flooding sweep efficiency. Profile control plugging is a measure that is frequently used. Traditional plugging program design does not take into account the fluid loss, Program design of the blocking agent dosage is always small, the result is not satisfactory. In this paper, the classic percolation theory is used, seepage equation of the fracture system and matrix system is established, the blocking agent Filtrate a

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15

Reinhardt, Uli, and Nicholas Corniuk. "Wetted Ramps Selectively Block Upstream Passage of Adult Sea Lampreys." Fishes 9, no. 8 (2024): 293. http://dx.doi.org/10.3390/fishes9080293.

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Dams fragment stream habitats and fishways around dams typically serve few species that are strong swimmers or jumpers. We tested a prototype wetted ramp designed to allow upstream passage of small-bodied fishes while blocking upstream movement of invasive sea lampreys in the Laurentian Great Lakes. We tested short, smooth ramps with 5–10 mm water depth in various combinations of ramp angle, water flow, and swim channel width with the aim to selectively block adult migrating sea lampreys (Petromyzon marinus) while passing sub-adult white suckers (Catostomus commersonii) and creek chubs (Semoti

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16

Zeng, Wei, Mingchang Lu, Jin Liao, et al. "Research on influencing factors and remedial measures of coal seam water blocking effect." E3S Web of Conferences 416 (2023): 01024. http://dx.doi.org/10.1051/e3sconf/202341601024.

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Coalbed methane development primarily relies on hydraulic fracturing and drainage gas extraction processes. The intrusion of external fluids and long-term drainage and extraction contribute to the water blocking effect, which becomes one of the crucial factors affecting production capacity. In this study, the coal reservoir of a certain coalbed methane in Hancheng, Shaanxi Province, was selected as the research object. The experimental method was employed to comprehensively evaluate the correlation between factors such as coal sample moisture content, permeability, porosity, properties of exte

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17

Loane, R. F., and J. Silcox. "Hollow-cone illumination in simulated ADF STEM." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 124–25. http://dx.doi.org/10.1017/s0424820100152598.

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The overlap regions between CBED disks are a source of lattice fringe contrast in ADF STEM images of crystals. For sufficiently small lattice spacings, the Scherzer focus convergence angle is too small for the CBED disks to overlap, and the lattice is not visible. By increasing the convergence angle beyond the Scherzer angle to create an overlap region, and by using stationary phase defocus, smaller lattices can be imaged However, with larger convergence angles, lens aberrations spread the incident beam and small aperiodic structures, such as adatoms, become difficult to image. If the specimen

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18

Yao, Wenyan, Peisong Diao, Hequan Miao, and Shaochuan Li. "Design and Experiment of Anti-Blocking Components for Shallow Stubble Clearing Based on Soil Bin Test." Agriculture 12, no. 10 (2022): 1728. http://dx.doi.org/10.3390/agriculture12101728.

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In response to the problems of excessive wheat stubble blocking the opener during corn seeding in wheat–corn double cropping areas, an active-strip stubble removal method was proposed under the premise of conservation tillage. Firstly, the effects of two conventional rotary blade structures (inward and outward) on the stubble-cleaning effect and power consumption were studied under five rotary speeds (400, 500, 600, 700, 800 rpm). The results show that when the rotary speed was 400–600 rpm, the outward structure of the rotary blade was more suitable for stubble cleaning. Then, a torque sensor

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19

Pustovit A.N. "Theoretical dependence of the target threshold sputtering energy on the incidence angle of primary ions." Technical Physics Letters 49, no. 1 (2023): 28. http://dx.doi.org/10.21883/tpl.2023.01.55343.19206.

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To calculate the angular dependence of the threshold sputtering energy on the ratio of the target masses and incident ions, the target surface blocking phenomenon is used. It is established that the angular dependence of the threshold sputtering energy varies inversely proportional to the cosine of the incidence angle of the primary beam on the target (the angle is measured from the normal to the target surface) to power s/2 (s is a power exponent in the interaction potential of colliding particles). A comparison with the literature data is carried out. Keywords: sputtering, threshold energy,

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20

Oni, Oluwafemi E., Andrew G. Swanson, and Rudiren Pillay Carpanen. "Line Commutated Converter Response during Total and Partial De-Blocking of a Bipolar MTDC System." International Journal of Engineering Research in Africa 52 (January 2021): 49–61. http://dx.doi.org/10.4028/www.scientific.net/jera.52.49.

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This paper focuses on the fault blocking analysis and operational issues associated with MTDC systems incorporated in an AC network. The dynamic modelling of a line-commutated converter based bipolar multi-terminal direct current (LCC MTDC) system are shown, and the dynamic response of the converter during a DC converter fault is discussed. The converter controller design for both rectifiers and the inverters system was modelled for a realistic active power and extinction angle (γ) control with consideration to the VI characteristics of all the converter stations. An overall power controller w

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21

Liu, Hao, Changchun Wu, Senyuan Lin, Yunquan Li, and Yonghua Chen. "Double-Acting Soft Actuator for Soft Robotic Hand: A Bellow Pumping and Contraction Approach." Biomimetics 7, no. 4 (2022): 171. http://dx.doi.org/10.3390/biomimetics7040171.

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When compressing a soft bellow, the bellow will contract and pump out the fluid inside the bellow. Utilizing this property, we propose a novel actuation method called compressing bellow actuation (CBA), which can output fluidic power and tendon-driven force simultaneously. Based on the CBA method, a double-acting soft actuator (DASA) combining fluidic elastomer actuator (FEA) and tendon-driven metacarpophalangeal (MCP) joint is proposed for robotic finger design. The proposed DASA exhibits both compliance and adaptiveness of FEAs, and controllability and large output force of the tendon-driven

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22

Wang, Xiangyang, Xiantang Zhang, Jingshuang Zhang, Hongmin Zhou, Peng Zhang, and Dan Li. "Study on the Influence of the Joint Angle between Blast Holes on Explosion Crack Propagation and Stress Variation." Processes 11, no. 9 (2023): 2805. http://dx.doi.org/10.3390/pr11092805.

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The joints and fissures in a natural rock mass can affect the mechanical properties of the rock mass, the propagation of a blasting stress wave, and the blasting effect of the smooth surface of roadways. In the process of roadway drilling and blasting, there will inevitably be some joints between the two blast holes. Taking the joint angle as the starting point, this paper studies the rule of rock explosion crack propagation and stress variation when there are joints with different angles between two blast holes and analyzes the influence of joints on rock mechanical properties and blasting ef

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23

Chu, Wei Hua, Wen Gai, and Zheng Hua Gu. "Research on Movement Relationship and Multi-Axis Motion Control Strategy for the Big Attack Angle Device of the Low-Speed Wind Tunnel." Advanced Materials Research 945-949 (June 2014): 1517–23. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.1517.

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For the big angle attack device of 4m×3m low-speed wind tunnel, the attack angle device α change is realizes through the triangle link block organization, realizes angle of attack Alpha uniform speed revolving is a misalignment speed control process. In order to guarantee the blocking in realizes the angle of attack Alpha and in the angle of slide Beta pinpointing process, according to the request angular speed uniform speed rotation, and guaranteed that the model center does not deviate in the rotation process the wind tunnel center, this article, in the angle of attack Alpha organization, th

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24

Chen, Shuifu, Yuqun Huang, Jingluan Han, et al. "Blocking Rice Shoot Gravitropism by Altering One Amino Acid in LAZY1." International Journal of Molecular Sciences 23, no. 16 (2022): 9452. http://dx.doi.org/10.3390/ijms23169452.

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Tiller angle is an important trait that determines plant architecture and yield in cereal crops. Tiller angle is partially controlled during gravistimulation by the dynamic re-allocation of LAZY1 (LA1) protein between the nucleus and plasma membrane, but the underlying mechanism remains unclear. In this study, we identified and characterized a new allele of LA1 based on analysis of a rice (Oryza sativa L.) spreading-tiller mutant la1G74V, which harbors a non-synonymous mutation in the predicted transmembrane (TM) domain-encoding region of this gene. The mutation causes complete loss of shoot g

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25

Boudghene Stambouli, Arslane, Rafik Benallal, Nourredine Oudini, Sidi Mohamed Mesli, and Rabah Tadjine. "Control of Dual Frequency Capacitively Coupled Plasma via blocking capacitor and phase angle." European Physical Journal Applied Physics 80, no. 1 (2017): 10802. http://dx.doi.org/10.1051/epjap/2017170180.

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26

Xie, Xin, Majid Bigdeli Karimi, Sanwei Liu, Battushig Myanganbayar, and Carol Livermore. "Micro Motion Amplifiers for Compact Out-of-Plane Actuation." Micromachines 9, no. 7 (2018): 365. http://dx.doi.org/10.3390/mi9070365.

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Small-scale, out-of-plane actuators can enable tactile interfaces; however, achieving sufficient actuator force and displacement can require larger actuators. In this work, 2-mm2 out-of-plane microactuators were created, and were demonstrated to output up to 6.3 µm of displacement and 16 mN of blocking force at 170 V. The actuators converted in-plane force and displacement from a piezoelectric extensional actuator into out-of-plane force and displacement using robust, microelectromechanical systems (MEMS)-enabled, half-scissor amplifiers. The microscissors employed two layers of lithographical

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27

Пустовит, А. Н. "Теоретическая зависимость пороговой энергии распыления мишени от угла падения первичных ионов". Письма в журнал технической физики 49, № 1 (2023): 31. http://dx.doi.org/10.21883/pjtf.2023.01.54055.19206.

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To calculate the angular dependence of the threshold sputtering energy on the ratio of the target masses and incident ions, the target surface blocking phenomenon is used. It is established that the angular dependence of the threshold sputtering energy varies inversely proportional to the cosine of the incidence angle of the primary beam on the target (the angle is measured from the normal to the target surface) to power s/2 (s is a power exponent in the interaction potential of colliding particles). A comparison with the literature data is carried out.

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28

Li, Jinyang, Zhaozhao Wu, Meiqing Li, and Zhijian Shang. "Dynamic Measurement Method for Steering Wheel Angle of Autonomous Agricultural Vehicles." Agriculture 14, no. 9 (2024): 1602. http://dx.doi.org/10.3390/agriculture14091602.

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Steering wheel angle is an important and essential parameter of the navigation control of autonomous wheeled vehicles. At present, the combination of rotary angle sensors and four-link mechanisms is the main sensing approach for steering wheel angle with high measurement accuracy, which is widely adopted in autonomous agriculture vehicles. However, in a complex and challenging farmland environment, there are a series of prominent problems such as complicated installation and debugging, spattered mud blocking the parallel four-bar mechanism, breakage of the sensor wire during operation, and sep

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29

Zhang, Yu-Ping, Ya-Ning Wang, Li Wan, Xin-Xin Chen, and Chang-Hua Zhao. "Superwetting Stainless Steel Mesh Used for Both Immiscible Oil/Water and Surfactant-Stabilized Emulsion Separation." Membranes 13, no. 10 (2023): 808. http://dx.doi.org/10.3390/membranes13100808.

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The design and fabrication of advanced membrane materials for versatile oil/water separation are major challenges. In this work, a superwetting stainless steel mesh (SSM) modified with in situ-grown TiO2 was successfully prepared via one-pot hydrothermal synthesis at 180 °C for 24 h. The modified SSM was characterized by means of scanning electron microscopy, energy spectroscopy, and X-ray photoelectron spectroscopy analysis. The resultant SSM membrane was superhydrophilic/superoleophilic in air, superoleophobic underwater, with an oil contact angle (OCA) underwater of over 150°, and superhydr

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30

Ji, Juanjuan, Yecai Guo, Lanfang Zhang, and Lihua Zhang. "3D Variable Coefficient KdV Equation and Atmospheric Dipole Blocking." Advances in Meteorology 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/4329475.

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A (2 + 1)-dimensional variable coefficient Korteweg-de Vries (3D VCKdV) equation is first derived in this paper by means of introducing 2-dimensional space and time slow-varying variables and the multiple-level approximation method from the well-known barotropic and quasi-geostrophic potential vorticity equation without dissipation. The exact analytical solution of the 3D VCKdV equation is obtained successfully by making use of CK’s direct method and the standard Zakharov–Kuznetsov equation. By some arbitrary functions and the analytical solution, a dipole blocking evolution process with twelv

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31

Kang, Jun Suk, and Chi Young Lee. "Evaluation of Thermal Radiation Blocking Effect of Water Mist Curtain in Fire of Hazardous Material Storage Tank." Fire Science and Engineering 38, no. 2 (2024): 36–45. http://dx.doi.org/10.7731/kifse.3cc5aff6.

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In this study, the thermal radiation blocking effect of a water mist curtain in a full-scale hazardous material storage tank fire was numerically simulated. A fire dynamics simulator (FDS) was used for the numerical simulation, and the accuracy of the heat flux prediction of the FDS was verified using an earlier experimental study on a full-scale hazardous material storage tank fire. Subsequently, a water mist curtain system was installed in a full-scale hazardous material storage tank, and the effects of fire source conditions and water mist curtain characteristics on the heat flux and therma

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32

Li, Qiang, Zhenzhong Fan, Qingwang Liu, et al. "Synthesis of a Superhydrophobic Fluorinated Nano-Emulsion and Its Modification on the Wettability of Tight Sandstone." Materials 15, no. 11 (2022): 4015. http://dx.doi.org/10.3390/ma15114015.

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The water-blocking effect is a serious problem when developing tight sandstone gas reservoirs, which can cause a sharp reduction in gas production. Wettability alteration of near-wellbore sand rock surface from superhydrophilicity to superhydrophobicity is an effective method to decrease capillary pressure. In this study, a superhydrophobic fluorinated nano-emulsion was synthesized via a soap-free emulsion polymerization process using methacryloxyethyl trimethyl ammonium chloride, trifluoctyl methacrylate, and styrene as monomers. The effect of the fluorinated monomer concentration on wettabil

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33

Li, Qiang, Zhenzhong Fan, Qingwang Liu, et al. "Synthesis of a Superhydrophobic Fluorinated Nano-Emulsion and Its Modification on the Wettability of Tight Sandstone." Materials 15, no. 11 (2022): 4015. http://dx.doi.org/10.3390/ma15114015.

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The water-blocking effect is a serious problem when developing tight sandstone gas reservoirs, which can cause a sharp reduction in gas production. Wettability alteration of near-wellbore sand rock surface from superhydrophilicity to superhydrophobicity is an effective method to decrease capillary pressure. In this study, a superhydrophobic fluorinated nano-emulsion was synthesized via a soap-free emulsion polymerization process using methacryloxyethyl trimethyl ammonium chloride, trifluoctyl methacrylate, and styrene as monomers. The effect of the fluorinated monomer concentration on wettabil

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34

Zhang, Guojiang, Yongyong Jia, and Qian Zhou. "The Coordination Control Strategy for Improving Systems Frequency Stability Based on HVDC Quota Power Support." Electronics 13, no. 16 (2024): 3218. http://dx.doi.org/10.3390/electronics13163218.

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This paper aims to improve the recovery characteristics of the receiving grid during DC blocking failures through DC emergency power support, revealing the mechanism of improving the power angle stability of the receiving grid through timely DC power increase and decrease. Based on the transmission pattern of “north-to-south power transmission” in a certain provincial power grid, the actual maximum long-term overload capacity of multiple DC lines is calculated, considering multiple constraints such as the strength of the receiving grid, the stability limit of AC evacuation channels, and DC ove

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35

Kojima, Kazutoshi, Satchiko Ito, Akiyo Nagata та Hajime Okumura. "Improvement of Homoepitaxial Layer Quality Grown on 4H-SiС Si-Face Substrate Lower than 1 Degree Off Angle". Materials Science Forum 717-720 (травень 2012): 141–44. http://dx.doi.org/10.4028/www.scientific.net/msf.717-720.141.

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In this study, we struck a balance between specular surface morphology and polytype homogeneity on an epitaxial layer grown on 4H-SiC Si-face substrate with off angle less than 1degree by controlling the C/Si ratio with the SiH4 flow rate. Schottky barrier diodes fabricated on a grown epitaxial layer exhibited a blocking of voltage over 1000 V and an n value of less than 1.1 with a high yield of more than 80%. A substrate with a low off angle was found to have an advantage as regareds the stress that generates the interfacial dislocations at the epitaxial layer/substrate interface during the e

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Xu, Qi Lei, Gong You Tang, Hai Lin Liu, Shao Ting Ge, and Xue Yang. "Radom Intermediate Points Based Path Planning in Unknown Environment." Applied Mechanics and Materials 325-326 (June 2013): 1688–91. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.1688.

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This paper presents RandomBug, a novel real-time path planning algorithm, for an autonomous mobile agent in completely unknown environment. According to this algorithm, all the planned paths are described and stored in the form of vectors. When the agent moves along the planned paths, it only considers the rotation angle and the movement distance in a single direction. The algorithm combines range sensor data with a safety radius to determine the blocking obstacles and calculate the shorter path by choosing the random intermediate points. When there is obstacle blocking in the current path, th

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Rowlandson, Paul, and Adrian Simpson. "Interleaving in Mathematical Category Learning." Journal for Research in Mathematics Education 56, no. 3 (2025): 125–47. https://doi.org/10.5951/jresematheduc-2024-0055.

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On the basis of a substantial, robust, and well-replicated cognitive science research literature, interleaving has been recommended across a range of professional pedagogical works as an evidence-based strategy for mathematics teachers. This report first notes the conflation of interleaving and spacing effects underpinning those recommendations and the limitations of some laboratory-based research as grounding for practice, particularly given that no direct interleaving research involves mathematical concepts with school students. It then reports on two large classroom experiments aimed at rep

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Guan, Xin, Zhenwu Ma, Chunju Wang, et al. "Analytical Model for Springback Prediction of CuZn20 Foil Considering Size Effects: Weakening versus Strengthening." Materials 13, no. 21 (2020): 4929. http://dx.doi.org/10.3390/ma13214929.

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The prediction of springback angle for ultra-thin metallic sheets becomes extremely difficult with the existence of size effects. In this study, size effects on the springback behavior of CuZn20 foils are investigated by experiments and analytical methods. The experimental results reveal that the springback angle first decreases gradually and then increases markedly with the decrease of foil thickness, which cannot be analyzed by current theoretical models. Then, an analytical model based on the Taylor-based nonlocal theory of plasticity is developed, in which the drastic increases of both the

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Naik, Saurabh, Gabriel Malgaresi, Zhenjiang You, and Pavel Bedrikovetsky. "Well productivity enhancement by applying nanofluids for wettability alteration." APPEA Journal 58, no. 1 (2018): 121. http://dx.doi.org/10.1071/aj17149.

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Water blocking is a frequent cause for gas productivity decline in unconventional and conventional fields. It is a result of the capillary end effect near the wellbore vicinity. It creates significant formation damage and decreases gas well productivity. The alteration of the rock wettability by nanofluids is an effective way to reduce water blockage and enhance gas production. Presently, several types of surfactants and nanofluids are used in the industry for contact angle alteration. In this study, we developed an analytical model and analysed the sensitivity to several parameters. After the

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Yi, X. S., S. L. Yu, W. X. Shi, et al. "Separation of oil/water emulsion using nano-particle (TiO2/Al2O3) modified PVDF ultrafiltration membranes and evaluation of fouling mechanism." Water Science and Technology 67, no. 3 (2013): 477–84. http://dx.doi.org/10.2166/wst.2012.565.

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In the present study, nano-sized TiO2/Al2O3 modified polyvinylidene fluoride (PVDF) membranes (MM) were fabricated and then utilized for oil/water emulsion separation. The results showed that, compared with PVDF membrane (OM), the contact angle of MM decreased and hydrophilicity increased. The ultrafiltration (UF) of oil in water emulsions with transmembrane pressure (TMP) increasing results in a sharp fall in relative flux with time. The cake filtration models did not always predict the performance over the complete range of filtration times very well. In the initial 30 min, all the four cake

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Gao, Di, and Wenwu Zhang. "A Cancelling-Blocking structure for decoupling of microstrip antenna array." Journal of Physics: Conference Series 2387, no. 1 (2022): 012005. http://dx.doi.org/10.1088/1742-6596/2387/1/012005.

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Abstract In this work, a cancelling-blocking structure (CBS) for decoupling of microstrip antennas was proposed, which can reduce the coupling between arbitrary elements of a one-dimensional E-plane antenna. Results demonstrate the optimized active VSWR and improved radiation efficiency. The cancelling-type decoupling structure consists of a plurality of electrically small metal sheet arrays printed on the dielectric above the antenna. The blocking-type decoupling structure means that each element uses independent dielectric and ground plane to cut off the coupling current propagation path. Fi

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Ding, Yanru, Yi Wang, Yuhua Gao, et al. "Research on Pole-to-Ground Fault Ride-Through Strategy for Hybrid Half-Wave Alternating MMC." Electronics 14, no. 14 (2025): 2893. https://doi.org/10.3390/electronics14142893.

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Considering the lightweight requirement of modular multilevel converter (MMC), the implementation of arm multiplexing significantly improves submodule utilization and achieves remarkable lightweight performance. However, the challenges of overvoltage and energy imbalance during pole-to-ground fault still exist. To address these issues, this paper proposes a hybrid half-wave alternating MMC (HHA-MMC) and presents its fault ride-through strategy. First, a transient equivalent model based on topology and operation principles is established to analyze fault characteristics. Depending on the arm’s

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Xu, Qi-lei. "RandomBug: Novel Path Planning Algorithm in Unknown Environment." Open Electrical & Electronic Engineering Journal 8, no. 1 (2014): 252–57. http://dx.doi.org/10.2174/1874129001408010252.

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This paper presents a novel real-time path planning algorithm for an autonomous mobile agent in completely unknown environment. In this algorithm, all the planned paths are described and stored in the form of vectors in the algorithm. Only the rotation angle and the movement distance in a single direction are considered when the autonomous moves along the planned paths. The algorithm combines range sensor data with a safety radius, which determines the blocking obstacles and calculates a shorter path by choosing the random intermediate points. These random intermediate points are be generated

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Gregov, Goran, Tonia Vuković, Leonardo Gašparić, and Matija Pongrac. "Development, Experimental Assessment, and Application of a Vacuum-Driven Soft Bending Actuator." Applied Sciences 15, no. 5 (2025): 2557. https://doi.org/10.3390/app15052557.

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This study presents the design, development, and experimental assessment of soft pneumatic actuators for achieving bending motion utilizing vacuum pressure, with their final application to soft robotic grippers. A novel soft actuator design is introduced, satisfying the following design requirements: safe operation without the risk of explosion, the ability to achieve large angular bending while overcoming significant forces, and the use of soft materials that are resistant to material fatigue. A vacuum-driven soft bending actuator (VSBA) was designed, incorporating a cylindrical ribbed bellow

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Tian, Aifen, Xixi Wang, Yue Sun, Xinrong Zhang, Hongyan Wang, and Liang Yang. "Preparation and performance analysis of Pt-IPMC for driving bionic tulip." Journal of Advanced Dielectrics 11, no. 04 (2021): 2150017. http://dx.doi.org/10.1142/s2010135x2150017x.

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Based on the biological characteristics of tulip, the low driving voltage and fast response of ionic polymer metal composite (IPMC), we analyzed the fabrication, morphology and performance of the platinum IPMC (Pt-IPMC) and selected the right IPMC for driving bionic tulip. The preparation and performance of IPMC was analyzed first in this paper such as blocking force, output displacement and bending angle of IPMC under the different directed current voltage (DC). The optimal IPMC sample size and driving voltage were selected based on tulip blooming angles and the strain energy density of IPMC,

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Chandra Sekaran, R., M. Akila, and N. Yuvaraj. "Transmitter Half Distribution Angle Optimization in Non-Line of Sight Visible Light Communication." Journal of Nanoelectronics and Optoelectronics 17, no. 2 (2022): 257–66. http://dx.doi.org/10.1166/jno.2022.3192.

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Visible light communication is a subset of wireless optical communication that uses white light-emitting diode-based illumination infrastructure for data transmission. Visible light communication (VLC) for indoor communication has recently received much attention to meet the ever-increasing data demands. In VLC, line-of-sight (LOS) connections can provide massive bandwidth while ensuring low path loss if there is an unobstructed path between the transmitter and the receiver, but they are prone to blocking. Non-line of sight (NLOS) links can provide significant blocking resilience and ease of u

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Choi, Tae-Hoon, Hyun Wook Lee, Jong-Min Baek, and Seung-Won Oh. "Light control using a double-stacked liquid crystal cell with enhanced viewing angle–blocking performance." Optical Materials 158 (January 2025): 116495. http://dx.doi.org/10.1016/j.optmat.2024.116495.

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Suvalyan, M. A. "Treatment of comminuted diaphyseal fractures of the femur using closed blocking intramedullary osteosynthesis." N.N. Priorov Journal of Traumatology and Orthopedics 9, no. 1 (2022): 40–44. http://dx.doi.org/10.17816/vto97095.

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During 1996-2000 at the Department of Urgent Traumatology of Loco-Motor System (Scientific Research Institute of Emergency Care named after N.V. Sklifosovskiy) intramedullar osteosynthesis using AO/ASIF blocked pin was performed in 20 patients with comminuted femur fractures (21 fractures). This method gives stabile fixation of fragments that allows to stand up and walk using crutches on 5-10 days after operation. Mean term of load bearing restoration and moving extremity function was 4.5 months. One patient had delayed fragments consolidation. No complications such as suppuration, extremity s

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Ammar, Ali, Luong Viêt Phung, Dominique Planson, Hervé Morel, and Camille Sonneville. "Design and Methodology of Silicon Carbide High Voltage Termination Extension for Small Area BJTs." Materials Science Forum 1062 (May 31, 2022): 613–18. http://dx.doi.org/10.4028/p-vms03o.

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An optimized termination extension tutorial is reported for a small area (≈ 1mm2 ) 4H-SiC NPN BJT. The extension system is based on a parametric JTE with isolation rings. Additional aspects such as (1) MESA angle, (2) relieving electric field on the base-drift junction, and (3) blocking the electric field from reaching border structure are investigated. A breakdown voltage greater than 10 kV is recorded, when drift region is n-doped to 8x1014 cm-3.

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Jiang, Qingfang. "Precipitation over Concave Terrain." Journal of the Atmospheric Sciences 63, no. 9 (2006): 2269–88. http://dx.doi.org/10.1175/jas3761.1.

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Abstract Many topographic barriers are comprised of a series of concave or convex ridges that modulate the intensity and distribution of precipitation over mountainous areas. In this model-based idealized study, stratiform precipitation associated with stratified moist airflow past idealized concave ridges is investigated with a focus on windward blocking, flow confluence, and the associated precipitation enhancement. It is found that flow confluence and precipitation enhancement by a concave ridge are controlled by the nondimensional ridge height M (M = Nmhm/U, where Nm is the moist buoyancy

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