This paper uses mathematical statistics method and analyzes the main scoring techniques: the serve technique, the jump smash technique, the net lob technique, the pushing backcourt ball technique and the smash technique by analyzing the data of the 29th Olympic Games by He Hanbin/Yu Yang (China) and Nova/Nasir (Indonesia). The analysis shows that: in the badminton mixed doubles match, since both sides are partners for many years, in order to win the game you must have good badminton technique; particularly the error rate of the net lob technique and the pushing backcourt ball technique is high, which needs further practice. The study plays a certain role in promoting the development of badminton technique and the popularization of badminton sports.
Water injection, air injection, air foam injection, and in-situ combustion technology are used step by step in the later period of oilfield. Oxygen corrosion caused by different development methods has become a problem that could not be ignored. In this paper, the mechanism of oxygen corrosion, the influencing factors of oxygen corrosion and the new progress of oxygen corrosion countermeasures in recent years are systematically analyzed. Anticorrosion methods for different development modes are put forward. The direction of further research on oxygen corrosion in oilfield development is proposed: ○1Prediction and control of corrosion in oxygen environment need to be further studied to better guide corrosion protection in high temperature injection and production of oil and gas wells. ○2The research of anticorrosive coating materials and corrosion inhibitor technology needs to be further developed in the direction of safety and environment-friendly.
Hysteresis is a common phenomenon in passively mode-locked lasers and refers to the effect where the thresholds marking transitions between different pulsation states are not the same for an increasing or decreasing pump power. Despite wide presence in experimental observations, the general dynamics of hysteresis remains elusive, largely due to the challenge to acquire the full hysteresis dynamics of a given mode-locked laser. In this Letter, we overcome this technical bottleneck by fully characterizing an exemplar figure-9 fiber laser cavity, which exhibits well-defined mode-locking patterns in its parameter space or “primitive cell.” We varied the net cavity dispersion and observed the salient change of hysteresis characteristics. Specifically, transiting from an anomalous to a normal cavity dispersion is found to consistently increase the likelihood of the single-pulse mode-locking regime. To the best of our knowledge, this is the first time that a laser’s hysteresis dynamic is fully probed and related to fundamental cavity parameters.
In recent years, Transformer has shown great performance in speech enhancement by applying multi-head self-attention to capture long-term dependencies effectively. However, the computation of Transformer is quadratic with the input speech spectrograms, which makes it computationally expensive for practical use. In this paper, we propose a low complexity hierarchical frame-level Swin Transformer network (FLSTN) for speech enhancement. FLSTN takes several consecutive frames as a local window and restricts self-attention within it, reducing the complexity to linear with spectrogram size. A shifted window mechanism enhances information exchange between adjacent windows, so that window-based local attention becomes disguised global attention. The hierarchical structure allows FLSTN to learn speech features at different scales. Moreover, we designed the band merging layer and the band expanding layer for decreasing and increasing the spatial resolution of feature maps, respectively. We tested FLSTN on both 16 kHz wide-band speech and 48 kHz full-band speech. Experimental results demonstrate that FLSTN can handle speech with different bandwidths well. With very few multiply–accumulate operations (MACs), FLSTN not only has a significant advantage in computational complexity but also achieves comparable objective speech quality metrics with current state-of-the-art (SOTA) models.
Remote ischemic perconditioning (RIPerC) could improve neuronal damage and inhibit inflammation and apoptosis.We conducted an in-depth exploration of the protective mechanism of RIPerC in cerebral ischaemia injury. In this study, a middle cerebral artery occlusion (MCAO) mouse model was built. According to whether to undergo RIPerC treatment and the duration of cerebral infarction, mice were divided into 5 groups: Sham group, MCAO 3.0 h group, MCAO 4.5 h group, MCAO 3.0 h + RIPerC group, and MCAO 4.5 h + RIPerC group. Overexpressed or silenced miR-153-5p was transfected into the cells to analyse the effects of oxygen-glucose deprivation (OGD) treatment on Neuro-2a cell viability, apoptosis, and related gene expressions by performing quantitative real-time polymerase chain reaction (qRT-PCR), MTT assay, flow cytometry, and Western blot. Bioinformatics analysis, qRT-PCR, dual-luciferase experiment, and RNA immunoprecipitation (RIP) were used to screen and verify the miRNA and downstream mRNA-targeted Toll-like receptor 4 (TLR4). The rescue test further verified the effects of the above target genes and miR-153-5p on the apoptosis of OGD-injured cells, apoptosis-related proteins, and the p65/IκBα pathway. The plasma levels of miR-153-5p in 68 patients with ischaemic stroke were detected within 6 hours of onset, and the patients were followed up for 3 months. We found that, in in vivo studies, RIPerC treatment inhibits cerebral infarction volume and neurological damage, and promotes the expression of miR-153-5p in the MCAO animal model. The expression of miR-153-5p in OGD cells was inhibited, and its upregulation protected Neuro-2a cells. TLR4 was predicted to be the target gene of miR-153-5p and could offset the effect of miR-153-5p mimic on OGD cell protection after up-regulating TLR4. TLR4 overexpression promoted the activation of OGD on the p65/IκBα pathway. Compared with the high plasma miR-153-5p group, the 3-month overall survival rate of patients with ischaemic stroke in the low plasma miR-153-5p group was significantly lower (χ 2 = 5.095, p = 0.024). In conclusion, RIPerC intervention inhibits the damage caused by cerebral ischaemia partially through the miR-153-5p/TLR4/p65/IκBα signalling pathway.
ObjectivePedicle screw implantation is the most common technique to achieve stability during spinal surgeries. Current methods for locating the entry point do not have a quantified criteria and highly rely on the surgeons' experience. Therefore, we aim to propose a quantified pedicle screw placement technique in the lumbar spine and to investigate its accuracy and safety in clinical practice.MethodsWe conducted a retrospective study involving 110 patients who received spinal surgery in our hospital from August 2018 to August 2021. All patients included had herniation of a single lumbar disc and were consistently treated with posterior discectomy, inter‐body fusion, and transpedicular internal fixation. For 54 patients in the observation group, the pedicle screws were placed with our technique, which is located at 4 mm below the superior edge of the transverse process in line with the lateral margin of the superior articular process. For 56 patients in the control group, pedicle screws were placed according to the traditional crista lambdoidalis method. Comparisons were made in terms of the operation time, blood loss, time for exposure, the accuracy of placement, and postoperative complications. Furthermore, we applied our method to 64 patients with indistinguishable crista lambdoidalis and evaluated the accuracy of screw placement and clinical outcomes according to the visual analogue scale (VAS) and the Japanese Orthopaedic Association (JOA) score.ResultsThere was no significant difference in intraoperative bleeding, accuracy of placement, and postoperative complications between our technique and the traditional crista lambdoidalis method (P > 0.05). However, the exposure time before screw placement (12.8 ± 0.3 vs. 17.4 ± 0.3, P = 0.001) and the total surgery time (97.2 ± 1.9 vs 102.3 ± 0.9, P = 0.020) were significantly shortened with our method. Additionally, in cases with indistinguishable crista lambdoidalis, our technique showed satisfying accuracy, with 97.6% screws placed in appropriate trajectory on the first attempt and all screws eventually positioned in the safe zone according to the Gertzbein–Robbins grading. All patients experienced steady improvement after surgery.ConclusionPlacing pedicle screws at 4 mm below the superior edge of the transverse process in line with the lateral margin of the superior articular process is a viable pedicle screw placement method. With this method, we observed a higher success rate and shorter operation time. In addition, this method can be applied in cases with indistinguishable crista lambdoidalis, and have satisfied success rate and clinical outcome.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.