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Background Patients with lower limb fracture often have acute pain and discomfort from changes in position, and such pain affects early postoperative recovery. This study aimed to compare the applicability and effectiveness of ultrasound combined with nerve stimulator-guided lumbosacral plexus block (LSPB) in the supine versus lateral position during lower limb fracture surgery. Methods We included 126 patients who underwent elective internal fixation for lower limb fracture who were divided into the S group and the L group by the random number table method and underwent LSPB guided by ultrasound combined with a nerve stimulator in the supine and lateral positions, respectively. The primary outcome was the dose of sufentanil used in surgery. The secondary outcomes were the maximum VAS (visual analogue scale) pain score at position placing for LSPB, the time of position placing, the time for nerve block,the number of puncture attempts,the haemodynamic indicators, the VAS score at 1, 12, and 24 h following surgery, postoperative satisfactory degree to analgesia and adverse events related to nerve block. Results There was no statistically significant difference in dose of sufentanil used between the two groups( P  = 0.142). The maximum VAS pain score at position placing( P  < 0.01), the time of position placement( P  < 0.01), the time for lumbar plexus block and the time of puncture attempts were significantly lower in the S group than in the L group ( P  < 0.01). However, the time for sacral plexus block was higher in the S group than in the L group ( P = 0.029 ). There was no significant difference in haemodynamic indicators,number of puncture attempts for the sacral plexus, postoperative VAS scores, postoperative satisfactory degree to analgesia or adverse events related to nerve block between the two groups (all P  > 0.05). Conclusions Our study provides a more comfortable and better accepted anaesthetic regimen for patients undergoing lower limb fracture surgery. LSPB in the supine position is simple to apply and has definite anaesthetic effects. Additionally, it has a high level of postoperative analgesia and therefore should be widely applied. Trial registration The trial was registered prior to patient enrolment at the Chinese Clinical Trail Registry (Date:11/03/2021 Number: ChiCTR2100044117 ).

Functional gradient structure design is one way to improve the anti-ballistic performance of ceramic composite armors. In this paper, the design theory of dual phase hybrid functionally graded ceramics is established. Through the finite element simulation of the anti-ballistic behaviour, three structural effects of dual phase hybrid functionally graded ceramics composite armor are studied: monolithic ceramics (MC), unidirectional functionally graded ceramics (UFGC) and bidirectional functionally graded ceramics (BFGC). The ceramics structure of composite armor is optimized. The simulation results of the optimized structure of unidirectional and bidirectional functionally graded ceramics are better than that of monolithic ceramics, and the weight is lighter. This research can provide theoretical support for the design of functionally graded ceramic composite armor.

A path for testing a probabilistic seismic hazard assessment (PSHA) map is presented in this paper via the evaluation of fortification benefit with two indices, economic benefit and safety benefit. The effect of fortification intensity on the vulnerability of the engineering structure is emphasized in the damage estimation of the evaluation. The expected losses and casualties are calculated based on the total areas in each of the five damage states with local parameters. The result of a case study of the 1990 PSHA map of China shows that the expected total reduction of loss from the damage to brick concrete and reinforced concrete buildings constructed during the in-service period of the map and damaged in the subsequent destructive earthquakes is RMB 216.5 billion. Thus the expected economic benefit is RMB 17.5 billion in comparison to the additional fortification cost of RMB 199.0 billion. The expected casualty reductions are 20,838 fewer deaths and 77,801 fewer serious injuries. This indicates that the implementation of the 1990 PSHA map has indeed played a beneficial role in earthquake disaster mitigation. The evaluation result of the marginal benefit of fortification, in terms of increasing or decreasing the fortification intensities by one degree further for the whole country, shows that the fortification level adopted in China is appropriate as a whole.

The formation and evolution process of armour penetrating by 12.7mm armour piercing bullet is investigated. The survival probability calculation model of key functional part of armoured vehicles is established. Through statistics, at the situation of non-lining material, the maximum scattering angle can reach 54 degrees, while, with the protection by the lining material, the maximum scattering angle can be reduced to 12 degrees. The overall kinetic energy of fragments reduces with increasing the scattering angle. The lining material exhibited the energy absorbing function. The results show that the maximum kinetic energy with the protection by the lining material is 44% of the circumstances of non-lining material. Through the arrangement of the lining material and functional part position, the functional survival probability of ammunition and vehicle control can be improved significantly.

The uncertain ballistic effects and reliability optimization design of the ceramics composite armors are investigated. Considering the material uncertainty, the ballistic penetration process is analyzed through simulation model. The effects interlayer SiC mass fraction and the matrix thickness gradient ratio are discussed. The optimal parameters of both material and structure are obtained through reliability design methods and verified through ballistic experiments. The results show that the standard deviation can be reduced when interlayer SiC mass fraction increases. The ballistic depth can be reduced by increasing the gradient ratio. Through optimization, the ballistic reliability of the ceramic composite armor is improved.

Metastable β-type titanium alloys have garnered significant attention due to their microstructural diversity and excellent mechanical properties. In this study, the metastable β titanium alloy Ti-6Mo-3.5Cr-1Zr was subjected to the optimized heat treatment process. The optimization resulted in simultaneous enhancement of strength and ductility via grain refinement strengthening and transformation induced plasticity during plastic deformation. Furthermore, alloy microstructure analysis was conducted using Scanning Electron Microscope (SEM), Electron Back Scatter Diffraction (EBSD), and Transmission Electron Microscope (TEM) experiments. This work reveals the influence mechanism of solid solution time on the mechanical properties of titanium alloys, which provides theoretical guidance for the subsequent composition design and preparation of high-strength and high-ductility titanium alloys.

Objectives: Myocardiopathy occurs in ischemia-induced injury caused by dysregulation of autophagy of cardiac tissues. The present report evaluates the protective effect of ketamine and insulin against myocardial injury in type 2 diabetic rats (T2DM). Methods: The effects of ketamine and its combination with insulin on biochemical parameters and inflammatory cytokines in the serum of I/R-induced myocardial injury in T2DM rats were evaluated. The parameters of reactive oxygen species and the expression of autophagosome signaling pathway proteins were also determined. Using transmission electron microscopy, we investigated autophagosomes. Western blots were used to detect autophagy-associated signaling pathways. Myocardial function was determined by echocardiography and histopathological changes in myocardial tissues were also determined in I/R-induced myocardial injury in type 2 diabetic rats. Results: There was a significant reduction in glucose, AST, LDH, and CK-MB levels and cytokines (IL-1β, IL-6, and TNF-α) in serum of the ketamine (p < .05) and ketamine + insulin (p < .01) groups than in the diabetic + I/R. MDA and ROS levels were reduced with a substantial (p < .05) increase in GSH levels through improved cardiac function in the ketamine (p < .05) and ketamine + insulin (p < .01) groups than the diabetic + I/R group. There was an increase in mature autophagosomes in diabetic+I/R+Kt+In compared to diabetic+I/R+Kt alone in infarction and marginal zones. It should be noted that the significant increase (p < .01) in protein levels of the autophagy-associated intracellular signaling pathways AMPK and mTOR, as well as an increase in LC3-II and BECLIN-1, suggests that ketamine combined with insulin-activated autophagy-associated intracellular signaling AMPK and mTOR. Conclusion: The findings of the study suggest that ketamine combined with insulin administration remarkably protects I/R-induced myocardial injury in rats with T2DM by reducing the dysregulation of autophagy.

The calculation of electron-phonon couplings (EPCs) is essential for understanding various fundamental physical properties, including electrical transport, optical and superconducting behaviors in materials. However, obtaining EPCs through fully first-principles methods is notably challenging, particularly for large systems or when employing advanced functionals. Here we introduce a machine learning framework to accelerate EPC calculations by utilizing atomic orbital-based Hamiltonian matrices and gradients predicted by an equivariant graph neural network. We demonstrate that our method not only yields EPC values in close agreement with first-principles results but also enhances calculation efficiency by several orders of magnitude. Application to GaAs using the Heyd-Scuseria-Ernzerhof functional reveals the necessity of advanced functionals for accurate carrier mobility predictions, while for the large Kagome crystal CsV Sb , our framework reproduces the experimentally observed double domes in pressure-induced superconducting phase diagrams. This machine learning framework offers a powerful and efficient tool for the investigation of diverse EPC-related phenomena in complex materials.

● The historical development of free nitrous acid (FNA) technologies is reviewed. ● The roles of novel acid-tolerant ammonia oxidizers are highlighted. ● Acid-tolerant ammonia oxidizers can self-sustain high-level FNA production. ● The next-generation in situ FNA-based technologies are discussed. The biocidal effects of free nitrous acid (FNA) have found applications in multiple units in an urban wastewater system, including sewer networks, wastewater treatment processes, and sludge treatment processes. However, these applications are associated with chemical costs as both nitrite and acid are needed to produce FNA at the required levels. The recent discovery of novel acid-tolerant ammonia oxidizers offers the possibility to produce FNA from domestic wastewater, enabling the development of next-generation FNA-based technologies capable of achieving self-sustaining FNA production. In this study, we focus on the concept of in situ FNA generation facilitated by acid-tolerant ammonia oxidizers and highlight the multiple benefits it creates, after a brief review of the historical development of FNA-based technologies. We will discuss how wastewater systems can be made more energy-efficient and sustainable by leveraging the potential of acid-tolerant ammonia oxidizers.

A thorough examination of the establishment and development of China's Special Economic Zones (SEZ). These eight SEZs marked a major milestone in China's gradual market-oriented reform process, and the developmental fluctuations of these zones offers an in-depth understanding of the complexities and difficulties of reform. They also provide critical insight into China's thirty years of economic and social transformation. This book is a valuable and practical resource for governments, academics and policy advisors looking for an insight into and analysis of how the Special Economic Zone strategy played a key role in the transformation of China's economy.