In this article, ground‐motion prediction equations (GMPEs) based on the horizontal components of strong‐motion records from shallow crustal and upper‐mantle earthquakes in Japan are presented. We assembled a large dataset with moment magnitude ( M w) over 4.9 reliable earthquake category (the tectonic location earthquakes) up to end 2012. The GMPEs were set simple geometric attenuation functions. A bilinear magnitude‐scaling function hinged at w 7.1 was adopted, scaling rates for events...

The flow characteristics in a supersonic through-flow fan at the design condition of Mach 2.36 inflow are investigated through wall-resolved large eddy simulation. Good agreement between time-averaged and experimental results ensures validity Special attention is then given to interaction structures shock wave boundary layer on both suction pressure surfaces, along with wake flow, visualization modal decomposition. Further spectral analysis reveals unsteady nature separation bubble dominance...

The prerequisite for accurate prediction and effective control of flow phenomena fundamentally lies in the understanding dynamics, experimental studies provide essential data to support this process. Particle image velocimetry (PIV), as one important methods field measurement, plays a critical role investigations such past circular cylinder. PIV is non-contact laser-optical measurement technique; however, it often faces challenges obtaining complete when optical path obstructed. Particularly...

d-pantothenic acid (d-PA), also known as vitamin B5, is an essential precursor of coenzyme A and plays a crucial role in maintaining the physiological functions organisms. Ketopantoate hydroxymethyltransferase (PanB), encoded by panB gene, serves key rate-limiting enzyme d-PA synthesis. Additionally, catalytic function PanB requires cofactor 5,10-methylenetetrahydrofolate (5,10-CH2–THF). This study aimed to increase production engineering ketopantoate supply. The transcription factor bhsA...

Based on the Daozhen–Wulong Zimuyan tunnel, distance from outlet of air duct to tunnel face and diameter are studied through an orthogonal experimental design. Aiming at influence position axial flow fan in ventilation field, improved TOPSIS theory is adopted for detailed data analysis, field characteristics thoroughly checked identify optimal working condition configuration. The results show that with increase between face, local CO concentration will first decrease then increase,...

Rockburst disaster is one of the prominent problems faced by deep underground engineering. Microseismic (MS) monitoring techniques can be used to warn rockburst in tunnels provide scientific basis for rock burst prevention and control measures. Described this paper, an MS system based on source location with hierarchical strategy implemented tunnel group Jinping II hydropower station Sichuan Province, China. The spatiotemporal distribution events was analyzed construction process size effect...

The problem of large deformation is very prominent in deep-buried tunnel excavation soft rock, which brings serious potential safety hazards and economic losses to projects. Knowledge the stress field distribution law key ensuring rational design safe construction tunnels rock. As described this paper, theoretical analysis, numerical simulation monitoring were employed investigate surrounding rock displacement state Dongsong hydropower station Sichuan Province, China. results show that...

Thrombosis and restenosis are two major complications associated with current commercial vascular stents. In situ regeneration of a healthy endothelium has been recognized as promising strategy to address these issues. Numerous strategies have explored for this goal. However, in most the cases, they only focused on enhancing endothelial cell growth, ignoring antithrombotic requirements competition between smooth muscle cells (SMCs) (ECs) their growth. This resulted non-satisfying clinical...

Because of the barrier lake affected by highly changing and complex environment, it is always a great challenge that proper actions must be performed within limited amount time. Thus, how to scientifically efficiently analyze dam-break risk its impact area very important for disposal downstream communities transfer. To improve efficiency accuracy flood routing simulation, this paper mainly focuses on construction virtual geographic environment (VGE) system scale effect analysis. Unlike most...

It is important to determine the ventilation required in construction of deep and long tunnels variation law tunnel temperature fields reduce numbers high-temperature disasters serious accidents. Based on a project with high ground temperature, help convection heat transfer theory theoretical analysis calculation method, this paper clarifies contribution various sources air demand during construction, reveals environmental parameters that value by changing conditions. The results show...

Since barrier lakes are affected by a highly changing and complex environment, it is always great challenge to determine the proper actions that must be performed within limited amount of time. Existing methods have some restrictions, such as dispersed data resources personnel, loose model integration, complicated unfriendly user interface, which results in low efficiency dam-break risk assessment under emergency response conditions. These issues were addressed this paper constructing...

Forced ventilation or newly built vertical shafts are mainly used to solve problems in large underground cavern groups. However, it is impossible increase air supply due the size restriction of construction roadway, resulting deterioration. Based on Jinzhou oil storage project, we proposed both a summer scheme and winter scheme, after upper layer excavation completed connected with shaft. A three-dimensional numerical model validated field test data was performed investigate velocity CO...

At present, the damage caused by steel corrosion to structures has become a serious problem all over world. In order study mechanical behaviors of tunnel lining structure system under corrosive environment rebars, first, bending tests were performed investigate crack propagation behavior and structural bearing capacity reinforced concrete members degraded corrosion. Secondly, pull-out degradation bonding strength between corroded rebars concrete. Finally, on basis findings from tests, 3-D...

Abstract Damping modification factors (DMFs) are important for estimating the response spectrum design of structures with different damping ratios. This study investigated effects earthquake source parameters (magnitude, depth, and categories), distance (the closest from a site to fault plane large earthquakes hypocentral other events), conditions on DMFs displacement acceleration spectra horizontal components records Japan. used total 14,713 strong‐motion KiK‐net K‐NET compare three...

The prediction of effluent quality for wastewater treatment plants (WWTPs) has caused widespread concern because its essential role in ensuring water standards and reducing energy consumption. However, the complex nonlinearity WWTPs leads to difficulty forecasting less attention forecast uncertainty. A novel ensemble (EWQF)system is proposed, which contains data pre-processing, point prediction, interval accurately analyze this uncertainty, providing technical support feed-forward control...

Abstract High‐speed trains (HSTs) often face challenges associated with car‐body hunting, resulting from factors such as complex operating environments and wheel‐rail contact degradation. These issues have a significant impact on the ride quality operational safety. Passive suspension systems are inadequate to provide satisfactory dynamic performance for HSTs in circumstances. However, active can an effective solution. To address hunting stability of HSTs, this study proposes novel control...