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This paper aims to propose a 3D-map aided tightly coupled positioning solution for land vehicles to reduce the errors caused by non-line-of-sight (NLOS) and multipath interference in urban canyons.

First, a simple but efficient 3D-map is created by adding the building height information to the existing 2D-map. Then, through a designed effective satellite selection method, the distinct NLOS pseudo-range measurements can be excluded. Further, an enhanced extended Kalman particle filter algorithm is proposed to fuse the information from dual-constellation Global Navigation Satellite Systems and reduced inertial sensor system. The dependable degree of each selected satellite is adjusted through fuzzy logic to further mitigate the effect of misjudged LOS and multipath.

The proposed solution can improve positioning accuracy in urban canyons. The experimental results evaluate the effectiveness of the proposed solution and indicate that the proposed solution outperforms all the compared counterparts.

The effect of NLOS and multipath is addressed from both the observation level and fusion level. To the authors’ knowledge, mitigating the effect of misjudged LOS and multipath in the fusion algorithm of tightly coupled integration is seldom considered in existing literature.

This study aims to reveal the empirical linkage between tourists’ perspectives and attitudes towards disaster ruins and dark tourism by attesting influence relationships between disaster memorials perception, dark tourism evaluation, as well as heritage protection and tourism development intention.

Partial least squares structural equation modeling analysis was used on a sample of 413 valid visitor questionnaires collected at the 5·12 Wenchuan Earthquake Memorial Museum, Sichuan Province, China.

Disaster memorials perception positively influences positive evaluation of dark tourism, heritage protection intention and tourism development intention, while negatively influencing negative evaluation of dark tourism. Furthermore, positive evaluation of dark tourism and heritage protection intention positively affect tourism development intention. In addition, prior knowledge is a significant moderator in the research model.

This study applied the stimulus-organism-response framework and social exchange theory to predict tourists’ behavioral intention toward disaster memorials, providing valuable insights to dark tourism research. It illuminates tourists’ psychological and behavioral characteristics at natural disaster sites and deepens research on the human–nature relationship from the disaster perspective.

本研究试图通过验证自然灾难遗址地游客感知、旅游评价、遗产保护意愿与旅游开发意愿之间的影响关系, 以揭示游客对灾难遗址和黑色旅游的感知及态度之间的隐秘逻辑。

采用偏最小二乘法结构方程模型, 对在中国四川省5·12汶川特大地震纪念馆收集的413份有效游客问卷进行分析。

灾难遗址感知正向影响黑色旅游积极评价、遗产保护意愿和旅游开发意愿, 而负向影响黑色旅游消极评价。同时, 黑色旅游积极评价和遗产保护意愿均显著正向影响旅游开发意愿。此外, 游客的先验知识在研究模型中起着重要的调节作用。

本研究运用“刺激-机体-反应”研究框架预测了旅游者对自然灾难遗址地的行为意向, 深化了黑色旅游研究, 拓宽了S-O-R理论的适用范围。

Este estudio revela el vínculo empírico entre las perspectivas y las actitudes de los turistas hacia las ruinas de catástrofes y el Turismo oscuro, mostrando las relaciones de influencia entre la percepción de los monumentos conmemorativos de catástrofes, la evaluación del turismo oscuro, así como la protección del patrimonio y la intención de desarrollo turístico.

Se empleó un análisis de modelización de ecuaciones estructurales por mínimos cuadrados parciales en una muestra de 413 cuestionarios válidos de visitantes recogidos en el 5·12 Museo Conmemorativo del Terremoto de Wenchuan, Sichuan, China.

La percepción de los monumentos conmemorativos de las catástrofes influye positivamente en las evaluaciones positivas del turismo oscuro, la intención de protección del patrimonio y la intención de desarrollo turístico, mientras que influye negativamente en las evaluaciones negativas del turismo oscuro. Además, las evaluaciones positivas del turismo oscuro y la intención de protección del patrimonio influyen positivamente en la intención de desarrollo turístico. Además, el conocimiento previo moderadora significativamente el modelo de investigación.

Este estudio aplica el marco teórico estímulo-organismo-respuesta (E-O-R) y la teoría del intercambio social para predecir las intenciones de comportamiento de los turistas hacia los monumentos conmemorativos de catástrofes, proporcionando valiosas ideas para el estudio del turismo oscuro. Clarifica las características psicológicas y conductuales de los turistas en los lugares de catástrofes naturales y profundiza en el estudio de la relación entre el ser humano y la naturaleza desde la perspectiva de las catástrofes.

Compared to quad-rotor unmanned aerial vehicle (UAV), the tilting dual-rotor UAV is more prone to instability during exercises and disturbances. The purpose of this paper is using an active balance tail to enhance the hovering stability and motion smoothness of tilting dual-rotor UAV.

A balance tail is proposed and integrated into the tilting dual-rotor UAV to enhance hovering stability and motion smoothness. By strategically moving, the balance tail generates additional force and moment, which can promote the rapid stability of the UAV. Subsequently, the control strategy of the UAV is designed, and the influence of the swing of the balance tail at different installation positions with different masses on the dual-rotor UAV is analyzed through simulation. The accompany motion law and the active control, which is based on cascade Proportion Integration Differentiation (PID) control to enhance the hovering stability and motion smoothness of the UAV, are proposed.

The results demonstrate that active control has obvious adjustment effectiveness when the UAV moves to the target position or makes an emergency stop compared with the results of balance tail no swing and accompany motion.

The balance tail offers a straightforward means to enhance the motion smoothness of tilting dual-rotor UAV, rendering it safer and more reliable for practical applications.

The novelty of this works comes from the application of an active balance tail to improve the stability and motion smoothness of dual-rotor UAV.

This study aims to explore the traditional plant dyeing of Xinjiang Atlas silk fabrics, providing references for the comprehensive utilization of plant dyes in intangible cultural heritage.

The focus of this study is on dyeing experiments of Atlas silk fabrics using safflower extracts, constrained by regional resources. Safflower dry flowers grown in Xinjiang were selected, rinsed with pure water and rubbed. Yellow pigments were removed by adding edible white vinegar. Red pigments from safflower were extracted using an alkaline solution prepared with Populus euphratica ash, a special product of Xinjiang. The extraction rate was analyzed under varying material-to-liquor ratios, pH values, times and temperatures. Direct dyeing process experiments were conducted to obtain different colorimetric L, a, b and K/S values for comparison. Samples with good color development were selected to test the impact of dyeing immersions on color development, and their color fastness, UV protection and antibacterial effects were verified.

The dyeing experiments on silk fabrics confirmed their UV protection capabilities and antibacterial properties, demonstrating effectiveness against E. coli and Staphylococcus aureus. As a major producer of safflower, Xinjiang underscores the significance of safflower as an essential plant dyes on the Silk Road. This study reveals its market potential and suitability for use in the plant dyeing process of Atlas silk, producing vibrant red and pink colors.

The experiments indicated that after removing yellow pigments, the highest extraction rate of red pigment from safflower was achieved at a pH value of 10–11, a temperature of 30°C and an extraction time of 40 min. The best bright red color effect with strong color fastness was obtained with a material-to-liquor ratio of 1:20, a temperature of 40°C and three immersions. The best light pink color effect with strong color fastness was a material-to-liquor ratio of 1:80, a temperature of 30°C and two immersions.

The purpose of this paper is to evaluate the essential barrier and reveal the priority among common barriers to offshore wind energy in an Indian context with the assistance of the proposed framework.

Based on the proposed framework, a five-phase methodology was adapted to explore the essential barrier step by step. The common barriers, which were collected from the existing literatures through a systematic review, were further validated by field experts. The collected common barriers were evaluated with the assistance of the case industry’s field professionals through an analytical hierarchy process, a multi-criteria decision-making tool, to evaluate the barriers to Indian offshore wind energy.

Among the 12 common barriers to offshore wind energy, it is clear that “high capital cost” is the most essential barrier involved in the implementation of offshore wind energy farms in the Indian context.

This study reveals the importance of offshore wind power as a long-term profitable strategy to the case company within the Indian context. By addressing the essential barriers to the implementation of offshore wind farms, the Indian offshore wind system managers can train their employees to counteract the hindrances through the benchmarking of pioneering global offshore wind power developers such as Denmark and the UK. Further, this study provides useful suggestions to the Indian Government regarding policies for offshore wind energy; it also clearly projects the current status of the Indian offshore wind farm implementation.

This study assists Indian key stakeholders of offshore wind energy by indicating the essential barrier in an Indian context; they can remove the particular barrier instead of focusing on others that previous studies have identified. Further, this study brings out the importance of offshore wind power in an Indian context, which can urge stakeholders to invest more in offshore wind farms.