This study investigates the impact of rural tourism on transformation in China, using Liujiafan Hefei as a case study. Based system theory, it explores mechanisms and restructuration driven by under dual influence endogenous exogenous systems. Key findings include: (1) The tourism-driven process exhibits distinct phased holistic characteristics. (2) core this is re-creation value through interaction "human-land-industry," supported three major communities. (3) dynamic...

Abstract Rolling bearings are indispensable parts in mechanical equipment, and predicting their remaining useful life is critical to normal operation keep equipment good repair. However, the complex characteristics of make it difficult describe degradation characteristics. To address this issue, a novel method that combines an automatic feature combination extraction mechanism with gated recurrent unit (GRU) network has residual multi-head attention for rolling bearing prediction proposed....

Accurate and reliable segmentation of liver tissue tumor is essential for the follow-up hepatic diagnosis. In this paper, we present a method segmentation. The two methods are grounded on novel unified level set (LSM), which incorporates both region information edge to evolve contour. This framework more resistant leakage than single-information driven LSMs surpasses many other models Specifically, segmentation, hybrid image preprocessing scheme used first convert an input CT into binary...

Liver segmentation is considered as a challenge task, and accurate reliable of liver essential the follow-up treatment. In this paper, novel method including intensity separation, region growing morphological hole-filling presented. Firstly, separation employed to increase difference between intensities its adjacent tissues. Then following algorithm applied segment liver. And used at last refine results. The proposed was evaluated with patient dataset coming from Ningbo Li Hui-li hospital....

The quasi-static compressive and dynamic (SHPB) experiments were carried out to investigate the static property of titanium alloy Ti6Al4V though analysis comparison experiment results, Johnson-Cook constitutive model was established. cutting process simulated using orthogonal finite element model. Though simulation, considering adiabatic effect more correct. establishing provided conditions for further simulation parameters optimization Ti6Al4V.

The methodology of a new OA9 (34) matrix and an analysis variance technique were developed during the optimisation extracting pesticidal alkaloids from Cynanchum komarovii. Many factors found to affect amount extracted: which parts plant used – roots gave highest yield; particle size material yield when was sieved through 40 mesh; type solvent mixture 0.1% hydrochloric acid with industrial alcohol best; ratio 1 part eight extraction; duration extraction 72 h number re-extractions three also...

摘要: 针对国内汽车曲轴轴颈圆度误差、圆柱度误差检测普遍存在的效率低、精度低等问题,建立基于误差转换的平面曲线和空间曲线误差数学模型,结合圆和圆柱的数学表达建立满足最小包容条件的圆度和圆柱度误差评定数学模型,并采用遗传优化算法计算出符合最小评定要求的曲轴轴颈形位误差,解决了理想包容要素位姿参数不精确的问题。同时,建立基于图像域的汽车曲轴轴颈形状误差检测试验台,针对测量过程中连杆轴颈沿主轴颈公转运动,从而导致连杆轴颈图像域检测数据存在坐标不归一问题,以曲轴法兰端特征孔为基准,通过模板匹配特征与孔边缘提取实现了连杆轴颈圆度和圆柱度测量数据空间坐标归一化处理。以某型号发动机曲轴为例进行大样本误差检测试验,并与三坐标测量机测得的结果进行对比,数据分析表明提出的曲轴轴颈形状误差检测方法的精度为1 µm,且重复检测误差在0.1 µm以内,证明了其理论上的正确性及实践操作的可行性。

In laparoscopic cholecystectomy (LC), the anatomical variation of gallbladder canal should be noted. Bile duct injury is one most serious complications LC, which might lead to complications. This case because an intraoperative accidental cut right anterior inferior lobe bile joins cystic duct, after confirming by magnetic resonance imaging-guided real-time three-dimensional reconstruction and performing end-to-end anastomosis tube under laparoscopy, patient was discharged 5 days surgery,...

Using Kano model to analyze the service quality of B2C e-commerce sites, this paper aims explore classification attributes and further influence each on customer satisfaction. Research results show that current sites can be divided into three categories, which are must-be quality, one-dimension indifferent quality; also analyzes degrees attribute affects satisfaction provide a reference for improve their quality.

The mass transfer behavior in a hollow fiber membrane module of membrane-based artificial organs (such as liver or kidney) were studied by numerical simulation. A new computational fluid dynamics (CFD) method coupled with K-K equation and the tortuous capillary pore diffusion model (TCPDM) was proposed for simulations. urea clearance rate predicted use agrees well experimental data, which verifies validity our model. distributions concentration, pressure, velocity obtained to analyze...

Understanding the mass transfer behaviors in hollow fiber membrane module of artificial liver is important for improving toxin removal efficiency. A three-dimensional numerical model was established to study small molecule bilirubin and macromolecule bovine serum albumin (BSA) module. Effects tube-side flow rate, shell-side length on BSA were discussed. The simulation results showed that clearance significantly affected by both convective diffusive solute transport, while dominated...

Aim at the difficulty of cutting for titanium alloy, 3D finite element model has been established. The high speed simulated using established model. chip formation and force have analyzed. In same condition, experiment carried ou. Through comparison, result simulation agrees with well. It proves that is correct, can be used to investigate optimization parameters.

<title>Abstract</title> The wear state of mechanical seal friction pair directly determines the reliability seal. In this paper, mapping mechanism between contact response and acoustic emission (AE) energy signal is indicatively proposed, relationship frequency time-averaged explored. First all, AE sensors are arranged on test-bed, static dynamic tests carried out form M106K-WC (graphite-cemented carbide) WC-WC, data collected, amount two groups pairs measured; then, signals separated...