Doppler-free resolution near-infrared spectroscopy at 1.28~μ\mum with the noise-immune cavity-enhanced optical heterodyne molecular spectroscopy method

We report on the Doppler-free saturation spectroscopy of the nitrous oxide (N$_2$O) overtone transition at 1.28~$\mu$m. This measurement is performed by the noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) technique based on the quantum-dot (QD) laser. A high intra-cavity power, up to 10~W, reaches the saturation limit of the overtone line using an optical cavity with a high finesse of 113,500. At a pressure of several mTorr, the saturation dip is observed with a full width at half-maximum of about 2~MHz and a signal-to-noise ratio of 71. To the best of our knowledge, this is the first saturation spectroscopy of molecular overtone transitions in 1.3~$\mu$m region. The QD laser is then locked to this dispersion signal with a stability of 15 kHz at 1 sec integration time. We demonstrate the potential of the N$_2$O as markers because of its particularly rich spectrum at the vicinity of 1.28-1.30 $\mu$m where lies several important forbidden transitions of atomic parity violation measurements and the 1.3 $\mu$m O-band of optical communication

Examine Sustainable Urban Space based on Compact City Concept

The concept of compact city has been evolved through the time the urban development phase and the advanced technology Traditional compact city measurement categorized cities according to the compactness based on single-core urban development However the outward extension of city become multi-core and such urban pattern might need to be re-examined for sustainable development Housing price to income ratio is a popular indicator to assess the livability in such compact city Therefore this study applies temporal section analysis to explore urban compactness in 1995 and 2006 in Taipei metropolitan area Taiwan The principle component analysis will be utilized to classify compact city types according to the urban development features Moreover geographical weighted regression will then be used to explore the effect of urban compact features on house price-income ratio The PCA results show that the improved urban functions in high-medium compact city while the medium-low compact cities remain the same The GWR results show that the higher mixed land use might attract more diverse industries which can increase household income and mitigate housing pressur

The Research of Online Service Recovery Based on Kano’s Model

To identify customer requirements regarding e-retailing service failures, this study applied Kano’s model to sort the e-retailing compensation elements into various categories for identifying the key elements, maximizing customer satisfaction and minimizing customer dissatisfaction based on investigation of the sample of 167 e-retailing customers. The result indicates that a psychological compensation is the basic requirement of e-retailing customer and a refund can improve customer satisfaction when any service failure is occurred. Moreover, an economic compensation is indifferent for a dissatisfied customer. The result can help the e-retailer to understand what different compensations would have diverse effects on customers and provide effective guidelines to reduce customer’s dissatisfaction caused by the service failure

Realizing the Essence of the Sharing Economy: A Case Study of Drop-In Economy

This study explores the core values of the sharing economy (SE) through the lens of the Drop-In Economy, emphasizing non-economic motivations such as altruism, community support, and mutual aid. Using the Send Luv Box initiative, which provided meal deliveries to vulnerable communities inconvenient to transport between the mountains and the cities, the research demonstrates how sharing delivery fosters intergenerational support and strengthens social bonds. It seeks to reconnect with the original intent of SE by shifting away from profit-driven models to community-based practices that prioritize sustainability, social responsibility, and genuine resource sharing. Additionally, the paper proposes the use of an API-based system to integrate sharing delivery into a variety of everyday applications, allowing the drop-in economy to seamlessly function across multiple contexts and scenarios, enhancing accessibility and community engagement. Importantly, this research does not aim to criticize the economic aspects of the sharing economy but rather to develop a more sustainable model that can be enjoyed by people of all ages, helping them experience the true joy of sharing. By examining the impact of non-economic motivations and the practical implementation of sharing delivery, this study offers insights into how the sharing economy can evolve to retain its foundational principles in a modern context

Hybrid-Capacitor with Polyaniline/Carbon Electrodes

Hybrid-capacitors have the potential to synergistically combine the benefits of both electrochemical double layer capacitors (EDLCs) (longer cycle life) and pseudo-capacitors (higher capacitance). However, new processes that intimately combine the two primary materials from each capacitor (carbon and conductive polymer, respectively) within the electrodes in an ordered fashion on the nanoscale are needed to realize this potential. In this study, we report on a physical method (simultaneous electro-spinning/electro-spraying (E/E)) and a chemical method (in situ oxidative polymerization) for fabricating hybrid-capacitors with high surface area electrodes consisting of polyaniline (PANI) and carbon materials (referred to as E/E electrodes). E/E produces a PANI/carbon nanofiber/particle network with fiber diameters in the range of 500 to 2000 nm. The hybrid-capacitor with E/E electrodes exhibits an excellent specific capacitance of 235 F g^-1 (vs. 138 F g^-1 for capacitor with state-of-the art hybrid electrodes) at a current density of 1 A g^-1. Moreover, the capacitor with E/E electrodes retains approximately 84 % capacitance after 1000 charge-discharge cycles (vs. 67 % for capacitor with state-of-the art hybrid electrodes). A post mortem electron microscopy study of the E/E electrodes provides a rationale for the improved cycling stability. These results demonstrate the feasibility of producing E/E electrodes and their promise as future materials in hybrid-capacitors. Multiwall carbon nanotube (MWCNT)/PANI composites synthesized via in situ oxidative polymerization show improved electrochemical performance in a capacitor compared with pure MWCNTs due to the compact chemical bonding between MWCNT and PANI. Hybrid-capacitors with E/E MWCNT-PANI composite electrodes were also investigated and showed improved performance. Capacitor performance has a high correlation with morphology and polymer-carbon interface and connectivity and can be modified by fabrication and synthetic processes. A deep fundamental understanding of charge storage mechanisms in hybrid materials will guide the design of future polymercarbon electrodes for hybrid-capacitors

Analysing Population Displacement and Financial Precarity Induced by Gentrification based on Social Mix Perspective

This study investigates the spatial dynamics of gentrification and upward filtering in Taipei City, a metropolis characterized by Taiwan's highest population density and acute housing affordability challenges. Examining the interplay between financial precarity and population displacement, this research analyzes distinct patterns of neighborhood change within this dense urban context. Comparative analysis reveals that areas experiencing upward filtering, marked by increased real estate transaction volumes, exhibit a stronger correlation between market activity and rent prices, highlighting the direct impact of real estate dynamics on affordability. Conversely, the observed decline in high-income and highly educated residents in other areas suggests potential displacement pressures. Despite these shifts, the absence of strong spatial autocorrelation between real estate transactions and rent prices indicates the significant influence of localized factors, such as zoning policies, on rent price dynamics. Bivariate spatial autocorrelation analysis further underscores the interconnectedness of demographic changes, particularly the clustering of high-income and highly educated populations in upward-filtering areas. These findings contribute to a nuanced understanding of gentrification and upward filtering within Taipei’s unique urban landscape, providing insights for policies aimed at mitigating financial precarity and fostering equitable urban development

Exploring the Susceptibility of Gentrification in Taipei City, Taiwan

Gentrification is a dynamic process due to historically disinvested neighbourhoods experience susceptible class displacement in spatially concentrated areas. The attraction of the physical environment might encourage change of social class in local areas, and such replacement might push the original residents and others who might also suceptible outward to the marginal area or even further areas. The susceptible class includes elder, poorly educated, lower income, and people of colour, while the middle- and upper-class residents who are relatively younger, highly educated, and higher income may be able to stay. Taipei city is the captial and a municipality located in northern Taiwan. The population of Taipei city is around 2.5 million in 2022, and is part of Taipei–Keelung metropolitan area which is the 40th most-populous urban area in the world. The investment in transit and urban renewal projects have stimulated gentrification in Taipei city in the past, present and will do so in the future. Therefore, this study attempts to explore the susceptibility of gentrification for different neighbourhoods at two approaches in Taipei city. The first level is to identify various stages (including early, mid- current, late) of gentrification based upon small sets of indicators based upon real estate value and demographic changes. During the first phase, the temporal and spatial patterns of gentrifictaion will be analysed. The second phase will then apply principle component analysis (PCA) to explore social-economic indicators related to gentrification in various stages of genetrification. The outcome of the principle component analysis can help monitor changing conditions among various stages of gentrification and come up with an appropriate public response to the negative impacts of gentrification

Physical activity, sitting time, and duration of sleep during pregnancy in association with pregnancy outcomes

This study examined physical activity, sitting time, and duration of sleep during pregnancy and explored their associations with cesarean delivery, birth complications, and low birthweight. Though physical activity and sedentary behavior were not related to pregnancy outcomes, yet many women had a sedentary lifestyle before and during pregnancy

MECHANISM OF LANDING STRATERGY DURING STEP AEROBICS WITH DIFFERENT BENCH HEIGHTS AND LOADS

The purpose of this study was to investigate effects of different heights (6inch, 8inch, 10inch) and external loads (0% BW, 10% BW, 15% BW) on lower extremity during step aerobics. Ten college physical education students (age: 23.8 ± 2.1 years, height: 173.5 ± 6.1 cm, weight: 68.5 ± 8.0 kg) participated in this study. A Mega high-speed camera (100 Hz) and an ATMI force plate (1000Hz) were used to record kinematic and kinetic data respectively during step aerobics. Increased vertical ground reaction force, ankle movement, and decreased leg stiffness and ankle joint stiffness were found as the bench height increased to 10 inches which were considered to a high loading rates and shock to the lower extremity, especially at ankle joint. Therefore, people should avoid doing step aerobics at 10-inch bench height for a long time to protect ankle joint and soft tissue from injury