Degree Of Rebound Research Articles

Construction Method and Process Optimization of Prestress Reverse Tensioning for Large-Span Bidirectional Suspension Steel Roof Structures

For medium and small-scale steel structure stadiums, in order to minimize the impact of the construction process on the structural state, a prestressing construction process tailored to medium and small stadiums is proposed, taking full advantage of the inherent elastic deformation range of steel structures. The main steps of the process involve the construction of the main truss first. After the main truss construction is completed, it is lowered to a certain position within its elastic range using cables. The roof grid is then connected to the main truss. Once all connections are completed, the cable tension is gradually released. After the cable tension is released, the main truss exhibits a certain degree of rebound. During the rebound process, the roof grid forms a prestressed structure, ensuring stability and integrity between the main truss and the roof. Through numerical simulation, process analysis is conducted on this construction process, and the optimal construction scheme is proposed.

Start-Up Process Modelling of Sediment Microbial Fuel Cells Based on Data Driven

Sediment microbial fuel cells (SMFCs) are a typical microbial fuel cell without membranes. They are a device developed on the basis of electrochemistry and use microbes as catalysts to convert chemical energy stored in organic matter into electrical energy. This study selected a single-chamber SMFC as a research object, using online monitoring technology to accurately measure the temperature, pH, and voltage of the microbial fuel cell during the start-up process. In the process of microbial fuel cell start-up, the relationship between temperature, pH, and voltage was analysed in detail, and the correlation between them was calculated using SPSS software. The experimental results show that, at the initial stage of SMFC, the purpose of rapid growth of power production can be achieved by a large increase in temperature, but once the temperature is reduced, the power production of SMFC will soon recover to the state before the temperature change. At the beginning of SMFC, when the temperature changes drastically, pH will change the same first, and then there will be a certain degree of rebound. In the middle stage of SMFC start-up, even if the temperature will return to normal after the change, a continuous temperature drop in a short time will lead to a continuous decrease in pH value. The RBF neural network and ELM neural network were used to perform nonlinear system regression in the later stage of SMFC start-up and using the regression network to forecast part of the data. The experimental results show that the ELM neural network is more excellent in forecasting SMFC system. This article will provide important guidance for shortening start-up time and increasing power output.

H11 床材の物理特性が下肢関節の動作と筋活動に及ぼす影響(下肢の解析)

The purpose of this study was to investigate the effects of physical properties of surfaces on lower extremity joint motion and muscle activities during rhythmical hopping. Eight healthy male subjects volunteered to perform hopping at fixed rhythm on four surface conditions (no surface (control) sample A (degree of rebound: 50%) sample B (41%) sample C (13%)). The surface electromyography (EMG) of tibial anterior, gastrocnemius medialis, rectus femoris and biceps femoris were measured. A 3-D image for the motion analysis and ground reaction force were recorded by two high-speed cameras and two forceplatforms, simultaneously. Then power, work and stiffness of ankle, knee, hip joints and leg stiffness were calculated. At comparison of surface conditions there is no significant difference on each measured value in this study. The results of this study suggest that there are no influence on lower extremity joint motion and muscle activities as opposed to physical properties of surfaces under these experimental conditions.

A controlled trial of esmolol for the induction of deliberate hypotension

Twenty-five patients scheduled for lumbar fusion or cerebrovascular surgery were enrolled in an open label treatment controlled study comparing blood pressure and heart rate responses during deliberate hyperension with either esmolol or nitroprusside during steady-state N 2O/isofurane anesthesia. The first 5 patients were empirically assigned to the esmolol group; the remaining 20 patients were randomized to receive either esmolol or nitroprusside. The target of 15% reduction in mean arterial pressure (MAP) from baseline determined during anesthesia was attained with esmolol 195 ± 10 μg/kg/min (mean ± SEM) for the esmolol group ( n = 15) or nitroprusside 1.9 ±0 0.3 μLg/kg/min for the nitroprusside group ( n = 10). Nitroprusside use was associated with a 15.9 ± 5.3% increase in heart rate compared to a 12.1 ± 2.2% decrease in the esmolol group (p = 0.0001 between groups). Upon termination of the hypotensive infusions, nitroprusside patients had a MAP increase of 13.9 ± 5.5% above baseline (p < 0.05 compared to prehypotension) while the 7.4 ± 3.5% increase in the esmolol group was not statistically significant. Although 30% of Niroprusside patients overshot their baseline MAP by more than 25%, no esmolol patients had this degree of rebound. One esmolol patient had a brief period of atrial premature contractions. No patient in either group suffered any adverse reaction to hypotension. It is concluded that in moderate doses esmolol is a safe and effective hypotensive agent during isofurane anesthesia, with no reflex tachycardia and no significant potential for rebound hypertension. A MAP reduction of 30% from preanesthesia baseline was readily obtained with this combination.