Optimal Design of Intracranial Hematoma Puncture Drainage Tube Based on Adaptive Bifurcation Algorithm

Aiming at the puncture and drainage of clinical intracranial hematoma, we proposed an adaptive bifurcation algorithm based on the hematoma point cloud and optimized the design of the drainage tube. Firstly, based on the CT data of intracranial hematoma patients, a three-dimensional hematoma model was established, the point cloud on the surface of the hematoma was extracted and simplified, and the location of the main drainage tube was located by using the long-axis extraction algorithm. Secondly, the Eight Diagrams algorithm was used to identify the internal point cloud of hematoma, and the positions of multiple absorption points were determined by the K-means clustering algorithm. The locations of the bifurcation points of the main drainage tubes were calculated by the numerical method, and the telescopic lengths and directions of multiple subdrainage tubes were obtained. Finally, connect the main tube and the subtube, design an adaptive bifurcation drainage tube model, and apply it to intracranial hematoma puncture and drainage surgery. The algorithm can accurately determine the puncture point, puncture path, number, and location of subdrainage tubes according to the geometric characteristics of hematoma, achieve a uniform and accurate dose adjustment and drainage of intracranial hematoma, and accelerate the dissolution and drainage speed. The application of an adaptive bifurcation drainage tube can significantly reduce the risk of intracerebral hemorrhage, intracranial infection, and other complications, which has certain guiding significance and application value in clinical practice.

Low-Cost Temperature Transition Mixtures (TTM) Based on Ethylene Glycol/potassium Hydroxide as Reversible CO2 Sorbents

A low-cost Transition Temperature Mixture (TTM) has been synthesized by mixing ethylene glycol and potassium hydroxide as a new non-aqueous CO₂ sorbent. Boric acid has been added to ensure the reversibility of the system and a small amount of water to modulate the viscosity and optimize the performances. The resulting mixtures have been characterized in terms of viscosity, conductivity and density over temperature (therefore ionicity <i>via</i> Walden plots) and the effect of temperature, pressure and the kinetics of the absorption have been evaluated. Under optimized conditions, the four-component mixture EG/KOH/BA/H₂O 3:1:1:3 can absorb 24 g_CO2/kg_sorbent in 30 minutes at 35°C at 1 atm (59 after 4 h) and 60 g_CO2/kg_sorbent in 30 minutes at high pressure (10 and 20 atm, 80 g_CO2/kg_sorbent after 50 min), while the desorption is quantitative after 30 minutes at only 60°C under a gentle N₂ flow. The system is robust enough to ensure multiple absorption/desorption cycles.

Low-Cost Temperature Transition Mixtures (TTM) Based on Ethylene Glycol/potassium Hydroxide as Reversible CO2 Sorbents

A low-cost Transition Temperature Mixture (TTM) has been synthesized by mixing ethylene glycol and potassium hydroxide as a new non-aqueous CO₂ sorbent. Boric acid has been added to ensure the reversibility of the system and a small amount of water to modulate the viscosity and optimize the performances. The resulting mixtures have been characterized in terms of viscosity, conductivity and density over temperature (therefore ionicity <i>via</i> Walden plots) and the effect of temperature, pressure and the kinetics of the absorption have been evaluated. Under optimized conditions, the four-component mixture EG/KOH/BA/H₂O 3:1:1:3 can absorb 24 g_CO2/kg_sorbent in 30 minutes at 35°C at 1 atm (59 after 4 h) and 60 g_CO2/kg_sorbent in 30 minutes at high pressure (10 and 20 atm, 80 g_CO2/kg_sorbent after 50 min), while the desorption is quantitative after 30 minutes at only 60°C under a gentle N₂ flow. The system is robust enough to ensure multiple absorption/desorption cycles.

Design of an Ultra-thin Hepta-band Metamaterial Absorber for Sensing Applications

An ultra-thin metamaterial absorber (MMA) comprises of a split-ring-cross (SRC)-shaped resonator coupled with graphene and dielectric layer backed by metallic ground plane is presented for hepta-band applications. The proposed absorber demonstrates multiple absorption peaks at 2.33, 5.24, 7.74, 8.25, 10.05, 10.97 and 12.61 THz with average absorption more than 96 % . The physical mechanism of the hepta-band absorption is analyzing by electric field distribution and attributed to the combination of dipolar and LC resonance. Furthermore, the effect of geometric parameters is analyzed to validate the optimal selection of the structural parameters. In addition, proposed MMA is analyzed for different incident and polarization angles suggesting that absorption response is insensitive to polarization angles. Compared with the previously reported MMAs, proposed design is ultra-thin (0.036λ) and compact (0.21λ) at the lowest operational frequency. The absorptivity at 12.61 THz is 99.81 % and the corresponding quality (Q) factor is 31.52 for a bandwidth of 0.40 THz. The proposed absorber can be potentially utilized in detection, sensing and imaging. Moreover, sensing performance of the proposed MMA has been investigated using overlayer thickness and overlayer permittivity.

Observation of microsecond luminescence while studying two DNA-stabilized silver nanoclusters emitting in the 800-900 nm range.

We investigated two DNA-stabilized silver nanoclusters (DNA-AgNCs) that show multiple absorption features in the visible region, and emit around 811 nm (DNA811-AgNC) and 841 nm (DNA841-AgNC). Both DNA-AgNCs have large...

MULTIBAND METAMATERIAL ABSORBER IN A RING STRUCTURE BASE ON HIGH-ORDER MAGNETIC RESONANCE

We proposed a multiband metamaterial absorber(MMA) based on high-order magnetic resonance using ring-shaped structures. This MMA is not only simple with highly symmetric geometry but also effectively absorptive with multi-band and down- scalability. It was found that the absorption occurred at some specific frequencies, which are three times and five times higher than that of common structures, originates from the magnetic resonances. In particular, the obtained results can be theoretically explained by using the LC circuit model. In addition, by scaling down the unit-cell size, the third- and fifth-order magnetic resonances are created at the THz frequencies. The presence of multiple absorption peaks opens the possibility for MMAs working from the GHz to the THz band.We proposed a multiband metamaterial absorber(MMA) based on high-order magnetic resonance using ring-shaped structures. This MMA is not only simple with highly symmetric geometry but also effectively absorptive with multi-band and down- scalability. It was found that the absorption occurred at some specific frequencies, which are three times and five times higher than that of common structures, originates from the magnetic resonances. In particular, the obtained results can be theoretically explained by using the LC circuit model. In addition, by scaling down the unit-cell size, the third- and fifth-order magnetic resonances are created at the THz frequencies. The presence of multiple absorption peaks opens the possibility for MMAs working from the GHz to the THz band.

Theoretical Model for Spectroscopic Study of Cu+2, Co+2, and Fe+3 Dissolved in Ethanol with A Different Concentrations

The absorption spectrum for three types of metal ions in different concentrations has been studying experimentally and theoretically. The examination model is by Gaius model in order to find the best fitting curve and the equation controlled with this behavior. The three metal ions are (Copper chloride Cu+2, Iron chloride Fe+3, and Cobalt chloride Co+2) with different concentrations (10-4, 10-5, 10-6, 10-7) gm/m3. The spectroscopic study included UV-visible and fluorescence spectrum for all different concentrations sample. The results refer to several peaks that appear from the absorption spectrum in the high concentration of all metal ions solution. The multiple absorption peaks continued even at the lowest concentration in the iron ion solution. Fluorescence spectrum shows intensive stimulating of the radiation strength was perceived in the manifestation of Cu+2, Co+2 and Fe+3. From modeling investigation, there are converge between experimental and theoretical results of the fluorescence spectrum for metal ions. Furthermore, identity and convergence which defined as (r2), are on average (0.995).