Area Growth Research Articles

Productivity of coniferous forests evaluated by remote sensing and field-based models

Abstract The inadequacy of Norway spruce (NS) monocultures in fulfilling ecosystem services, due to deteriorating health and consequent forest ecosystem collapses, has recently become a concerning issue for the forestry sector in Central Europe. This study investigates spruce forest productivity using in-situ field observations (DendroNetwork) and satellite remote sensing (RS) data in the Czech Republic during the past two decades. Tree growth index and moderate resolution imaging spectroradiometer net primary productivity were used to assess productivity at the national scale along an elevation gradient. The analyses of spatiotemporal variation in carbon dynamics indicate a decreasing trend in productivity in 51% and 80% (2800 km2 and 4200 km2) of the spruce stands from the RS and in-situ data, respectively. The increasing trend is particularly evident in montane regions, where satellite data identified an elevation threshold around 900 m a.s.l. while in-situ data 700 m a.s.l. In these energy-limited montane areas, NS may benefit from increased temperatures and may remain relatively safe from drought stress. The decreasing trends detected by both approaches indicate deteriorating conditions for NS in lower elevations. This study suggests that combining in-situ and RS data provides an efficient and robust way to estimate forest productivity at the national scale. The anticipated response of spruce forests associated with declines in productivity and growth in areas with low to moderate elevation points to the adverse effects of climate change by shifting the ecological optimum to higher elevations. We conclude that detailed mapping of forest response to changing environmental conditions is critical to support sustainable forest management and decision-making, ultimately reflecting the need to adopt adequate strategies to mitigate the impacts of climate change and related natural and anthropogenic disturbances.

Phylogenetic relationships of Smilax astrosperma (Smilacaceae) with other Smilax species and its potential distribution patterns in karst areas of south China

The genus Smilax is adapted for growth in karst areas of south China, likely because of the karst habitat heterogeneity of the area and climate factors. However, the phylogenetic relationships among different species in this genus and impact of environmental changes on its geographic distribution patterns remain unclear. Therefore, we assembled the 11 chloroplast genomes of the genus Smilax and reconstructed its phylogeny using the maximum‐likelihood method to confirm the phylogenetic relationships of Smilax astrosperma among 28 other Smilax genus species. In addition, a maximum entropy (MaxEnt) model was applied to evaluate and predict the potential distribution of S. astrosperma using bioclimatic variables, soil environment, elevation, slope degree and aspect, and human footprints under present and predicted future climate scenarios. The results show that S. astrosperma has a close relationship with S. glabra in the genus Smilax. The average temperature of the coldest quarter is a crucial factor influencing the distribution of S. astrosperma in karst areas. The potential distribution range of S. astrosperma increases and decreases under the SSP1‐2.6 and SSP5‐8.5 scenarios, respectively. These findings highlight that S. astrosperma and other species of the karst areas of south China need special attention under climate warming since both warming itself and extreme weather events threaten their survival.

Chronic enrichment affects nitrogen removal in tidal freshwater river and estuarine creek sediments.

Population growth in coastal areas increases nitrogen inputs to receiving waterways and degrades water quality. Wetland habitats, including floodplain forests and marshes, can be effective nitrogen sinks; however, little is known about the effects of chronic point source nutrient enrichment on sediment nitrogen removal in tidally influenced coastal systems. This study characterizes enrichment patterns in two tidal systems affected by wastewater treatment facility (WWTF) effluent and assesses the impact on habitat nitrogen removal via denitrification. We collected intact sediment cores from prevalent habitats in a tidal freshwater river (TFZ; swamp forest) and a tidal estuarine creek system (EST; salt marsh) upstream and downstream of a WWTF outfall, and quantified dissolved gas fluxes across the sediment-water interface during wet conditions in early summer and dry conditions in late summer. Data collected during two synoptic water quality monitoring campaigns complimented laboratory experiments to provide environmental context for biogeochemical processing. The two systems exhibited different enrichment patterns such that the river-dominated TFZ system was characterized by consistently elevated nitrate + nitrite concentrations downstream of the WWTF, whereas precipitation and tidal influence affected nutrient distributions in the EST creek. Downstream sediments in TFZ exhibit an apparent saturation response, while upstream rates may be limited by other factors, such as labile organic matter availability. In contrast, downstream sediments in EST denitrify at higher rates than upstream during wet conditions that may enhance transport of effluent. This work provides information on ecosystem functioning in human-influenced environments and can be of use in developing nature-based solutions, such as water treatment wetlands, for nitrogen removal.

Exploring Digital-Only Banking in Malaysia: Technological Advancements, Regulatory Landscape, and Business Implications

Digital banking in Malaysia is undergoing rapid transformation, driven by technological advancements, regulatory frameworks, and evolving consumer preferences. This shift is marked by the adoption of critical technologies such as Application Programming Interfaces (APIs), low-code technology, cloud computing and artificial intelligence (AI) which are redefining how financial services are delivered. These innovations enhance operational efficiency, enable seamless integrations, and offer personalized customer experiences, positioning digital banking as a cornerstone of Malaysia’s financial ecosystem. Concurrently, regulatory measures introduced by Bank Negara Malaysia (BNM), including digital banking licenses and consumer protection policies, have facilitated a conducive environment for growth while ensuring financial inclusion and stability. Despite these advancements, the transition to digital-only banking is not without challenges. Cybersecurity threats, compliance complexities and technological dependency pose significant risks to both financial institutions and consumers. Addressing these issues requires a robust cybersecurity framework, continuous innovation and collaborative efforts among policymakers, industry players and technology developers. This paper reviews critical technologies shaping the industry, explores the regulatory landscape, evaluates security concerns, and examines the business implications and opportunities. The findings provide insights into the future of digital banking in Malaysia, focusing on innovations, challenges and potential growth areas.

Traditional Dual Tank Water Management: A Study of Kolakanatham in Perambalur District, Tamil Nadu

Societies make rainwater harvesting structures to collect and store rain water to cater for their immediate and future needs. In a remote village in the Perambalur district, the people use the dual temple tank, nearly 350 years old, for their drinking purposes. This study tries to understand the traditional knowledge embedded in the dual pond structures, cascade aerators, and an open well connected with the ground aquifer inside the tank. This study delves into projected rainfall trends using NASA POWER data for 2050, revealing a noticeable increase and an assessment of pond water quality parameters demonstrating adherence to acceptable limits set by the Bureau of Indian Standards (BIS). However, despite meeting these standards, the water quality index deems the water unsuitable for direct human consumption, though it remains suitable for domestic household use. Moreover, analysis of land cover and land use changes by Sentinel2A data over the past 22 years underscores significant growth in settlement areas, indicative of a rising demand for water resources. The study proposes the restoration and utilization of the dual tank system as a potential solution to address this burgeoning water demand, offering a reliable water source and preserving traditional practices within the local community.

Empirical Analysis of Key Factors Influencing China's Grain Production Capacity

China, as the world's most populous country, is also its largest consumer of grain. Ensuring grain security is vital for national stability and economic development, underpinning socioeconomic progress. Since the reform and opening-up period, China's grain production has doubled, successfully mitigating challenges such as the global grain crisis in 2006 and the food crisis triggered by COVID-19 in 2020. However, this achievement has come at a cost, with grain output heavily reliant on practices that deplete soil fertility and involve excessive use of pesticides and fertilizers, causing significant environmental strain. This study investigates the factors influencing China's grain production from 1980 to 2020, aiming to evaluate its comprehensive production capacity and provide practical recommendations. The analysis integrates theoretical and empirical approaches. Theoretically, the study examines the effects of variables such as irrigated arable land area (X1, thousand hectares), agricultural machinery power (X2, ten thousand kilowatts), grain sowing area (X3, thousand hectares), fertilizer consumption (X4, ten thousand tons), and natural population growth rate (X5, percentage) on grain output. Empirically, it utilizes principal component analysis and model testing through Eviews, incorporating five grain-related indicators. The findings reveal that the influence of these factors shifts across different stages of grain production and development. Based on the results, the paper offers targeted strategies to enhance China’s grain production capacity sustainably.

The Influence of Edaphic and Climatic Factors on the Morphophysiological Behavior of Young Argan Plants Cultivated in Orchards: A Comparative Analysis of Three Regions in Southwest Morocco

Argania spinosa (L.) Skeels is a unique endemic species in Morocco, renowned for its ecological characteristics and socio-economic importance. In Morocco, recent years have seen an exacerbation of the harmful effects of climate change, leading to an alarming decline in the natural regeneration of this species in its original habitats. It seems that the only viable solution lies in the domestication of this genetic heritage. This study marks the first in-depth investigation of the impact of various climatic and edaphic factors on the morphological and physiological traits of Argania spinosa young plants, assessed in six separate orchards and observed over four seasons (March 2022 (Winter), June 2022 (Summer), November 2022 (Autumn), and March 2023 (Winter)). A climatic assessment was carried out at each site, including measurements of rainfall, maximum and minimum temperatures, mean temperature, air temperature, and wind speed. The soil was analyzed for the pH, electrical conductivity (EC), water content, limestone (CaCO3), Kjeldahl nitrogen (N), available phosphorus (P2O5), organic matter (OM), and carbon/nitrogen ratio (C/N). To gain a better understanding of the morphophysiological characteristics of young argan seedlings, we carried out various observations, such as measuring the height and diameter of aerial parts, and the water content of leaves (WCL) and branches (WCB), quantifying chlorophyll (mg/m2) and leaf area. The results revealed a significant impact of edaphic and climatic factors on the morphophysiological parameters of young argan trees. Results revealed significant correlations of young argan plants between edaphic and climatic factors and morphophysiological parameters. The Tamjloujt site, characterized by protective vegetation cover, showed optimal growth conditions with the highest leaf and branch water content (46.89 ± 4.06% and 37.76 ± 3.51%, respectively), maximum height growth (91.33 ± 28.68 mm), trunk diameter (24.85 ± 3.78 mm), and leaf surface area (69.33 ± 19.28 mm2) during Summer 2022. The Saharan zone of Laqsabi exhibited peak chlorophyll concentrations (506.9 ± 92.25 mg/m2) during Autumn 2022, due to high temperatures. The mountainous environment of Imoulass negatively impacted plant growth (mean height: 52.61 ± 12.37 mm; diameter: 6.46 ± 1.57 mm) due to harsh climatic and edaphic conditions. This research provides vital knowledge regarding the environmental factors influencing the establishment of young argan plants within the Argan Biosphere Reserve. This contributes to the development of more effective domestication strategies and the restoration of agroecosystems. The aim is to use this knowledge to promote the rehabilitation and sustainability of argan agroecosystems.

Research on the Effects of Regional Economic Integration for Urban Economic Development

Since the 1970s, regional integration policies have been implemented across the globe, with examples ranging from the European Union and ASEAN to the North American Free Trade Agreement (NAFTA) and various regional trade agreements in African countries. As part of this global trend, China established the Pearl River Delta regional integration policy, leveraging its proximity to Hong Kong and Macau to attract investment and build a modern economic system. This initiative has significantly contributed to making Guangdong Province the leading economic powerhouse in China today. The purpose of this research is to investigate the impact of regional integration policies on economic growth in urban areas. Using the Pearl River Delta (PRD) cities as the treatment group and non-PRD cities as the control group, this study examines the economic effects of regional integration policies in the Pearl River Delta from 2002 to 2022. By utilizing the natural logarithm of GDP (ln-GDP) as an indicator of economic levels and applying the difference-in-difference (DiD) method for analysis, this research aims to provide comprehensive insights into how regional integration policies drive urban economic growth.

Vegetation development and soil conditions in reclaimed areas of former silica mines in Indonesia

To restore the function of ex-mining land according to its designation, the ex-mining area must be reclaimed. Ecological dynamics, especially soil conditions and the composition, structure, and biodiversity that occur in reclamation areas, need to be understood so that the reclamation area meets the criteria for the success of mine reclamation. This study aimed to understand the composition, structure, biodiversity, and soil conditions that influence growth in the reclamation area. The research was conducted in a silica mine reclamation area with a 17.8 m radius (r) circular plot (0.1 ha) of 10 plots (±1 ha) for vegetation and 9 points for soil sampling at a depth of 0-30 cm and 30-60 cm. In general, the results of the vegetation inventory show that the tree species recorded are dominated by Pinus merkusii, Hevea brasiliensis, and Enterolobium cyclocarpum with mean values of diameter, height, and low diversity conditions. The condition of soil physical and chemical properties in the reclamation area at both depths shows low mean values, which can affect the growth rate of plants in the reclamation area. The species of Schima wallichii that grow naturally in the reclamation area was found, indicating that the reclamation activities have created a good environment for other tree species to grow naturally. However, enrichment activities need to be carried out to increase biodiversity.

Geometric morphometric analysis of red fox (Vulpes vulpes) skulls using radiometric techniques at three and six months of development.

Morphological growth naturally progresses with age; however, the rate of growth varies across different parts of an organism, with certain structures developing more rapidly than others. This study aimed to analyze and compare the skull development of red foxes (Vulpes vulpes) during two specific developmental stages: the 3rd and 6th months, which represent distinct growth phases in their early ontogeny. In this study, we aimed to analyze and compare skull development in red foxes (Vulpes vulpes) during two specific post-natal time points: the 3rd and 6th months. Shape analysis was performed using radiographic images of nine red foxes at both the third and sixth months. Shape differences were observed in the skulls of red foxes (Vulpes vulpes) at these two ages. Our findings confirmed the hypothesis that skull shape changes over time, reflecting distinct morphological adaptations associated with age-related growth. In the measurements at the 3rd month, the neurocranial region exhibited a more distinct and developed structure compared to the facial bones. Toward the 6th month, the skull displayed a thinner and more elongated structure with the further development of the facial bones. This difference indicates a period of rapid growth and development in the neurocranial area, suggesting that red foxes experience significant neurological and sensory development early in life. Future studies on skull shape variation across different developmental stages in red foxes can expand on these findings. Age-related morphological studies, such as this one, provide essential baseline data on the natural growth and development of wild species like red foxes. This knowledge is essential for identifying deviations from normal development, which could result from environmental stressors, habitat changes, or malnutrition.

Forging new pathways: How farmland abandonment affects decision-making of non-grain production - Insight from China's mountainous areas.

The shift in crop growth in rural households towards non-grain crops is a focus of concern in China's grain security. Land allocation decisions by rural households to abandon farmland can affect crop growth decisions. Prior studies on the relationship between farmland abandonment and rural households' crop growing decisions have been insufficient. This study presents a theoretical framework that encompasses land, labor force, and capital. Using unique survey data from 2448 rural households in China's mountainous areas, we employ an endogenous switching regression model for empirical estimation. The findings demonstrate that farmland abandonment significantly promoted rural households to grow grain crops on their remaining farmland. If rural households had not abandoned their farmland, the crop acreage used for growing non-grain crops would have increased by 16.4%. The effects of abandonment on non-grain production decision-making vary based on per capita farmland area, farmland transfer, and agricultural social services. Furthermore, farmland abandonment by rural households affects decision-making regarding non-grain production by adjusting the agricultural labor force supply. Thus, under policies such as farmland protection and food security, it is necessary to balance the goals of replanting abandoned farmland and preventing non-grain crop growth in mountainous areas, with a focus on enhancing the level of mechanization.

Application of a discrete approach to designing the transport component of municipal solid waste logistics

Introduction. The growth of the urban area has led to the need to transfer landfills for the disposal of solid municipal (household) waste (MSW) to more remote locations on new sites. Representations and approaches to cargo transportation planning are an essential factor, separate planning of individual applications does not allow determining the results of future work with sufficient accuracy, since such an approach does not allow taking into account the interaction of rolling stock from different routes with each other and loading machines. The purpose of the study is to design the transportation of MSW in regional communications based on a discrete approach and theoretical provisions of operational planning of road freight transportation.Materials and methods. Within the framework of the conducted research, a normative approach was applied to the planning of freight transportation costs and descriptive models for describing the functioning of road transport systems of regional road freight transportation.Results and discussion. The solution of tasks related to the design of cargo transportation, including in regional communications, is due to the need in advance, prior to experience, knowledge of the results of future activities, since it is impossible to accumulate the work of road transport and then fix it. The results of cargo transportation depend on many factors, including the availability of a design methodology that allows you to adequately reflect the processes of their implementation. The use of mathematical modeling made it possible to reliably build plans for the transportation of MSW and determine the cost of their implementation.Conclusion. It has been revealed that possible downtime of both road trains and excavators is the reason for not fulfilling the operational transportation plan defined by separate planning. The use of the same rolling stock for customers with different transportation distances in the region will be accompanied by different costs.

Realizing Antithermal Quenching Red Emission in Mn4+-Activated Rb2NaVF6 for Optical Thermometry Sensor Application.

Currently, the development of red Mn4+-activated fluoride luminescent materials attracts a lot of attention in optical thermometry sensors, solid lighting, display, and plant growth areas. Nevertheless, the thermal stability of Mn4+-activated fluoride luminescent materials is still a crucial issue. Herein, a new red Rb2NaVF6:Mn4+ luminescent material with outstanding thermal stability was successfully synthesized through the facial coprecipitation method. Mn4+ ions prefer to occupy VF6 octahedra based on the accurate Rietveld refinement results. Accordingly, the as-prepared Rb2NaVF6:Mn4+ exhibits a broad absorption region from 300 to 500 nm with a maximum of 468 nm, matching well with the near-ultraviolet and blue InGaN chip. Upon 468 nm excitation, Rb2NaVF6:Mn4+ can emit narrow-band red light at 632 nm. Notably, Rb2NaVF6:Mn4+ shows superior antithermal quenching properties, of which the integrated intensities at 175°C can realize as high as 140% than that at 25°C. Owing to the diverse thermal quenching behavior between anti-Stokes and Stokes emission, Rb2NaVF6:Mn4+ displays promising candidates in optical thermometry sensors with a relative sensitivity Sr of 0.49%. This study offers new insight into developing antithermal quenching red Mn4+-activated fluoride luminescent materials.

Unplanned Urban Expansion and Natural Sensitivity in Chhorepatan, Pokhara

Chhorepatan, one of the geologically sensitive tourist hubs in Pokhara Valley, has undergone rapid and unplanned urbanization in the last five decades, changing its topography significantly. This research paper explores the unplanned urban expansion and natural sensitivities in Chhorepatan, Pokhara Metropolitan City. This paper uses satellite data, field surveys, and historical data to assess the impact of urban expansion on the area's geologically sensitive landscape using RS, GIS tools. The finding based on the satellite images of 1990-2020 reveals that rapid expansion of built-up sensitive areas increases subsidence risks, particularly in sinkhole and cave zones. Urban growth of Chhorepatan area, exacerbated by population growth and infrastructure development over the geologial sensitive area, poses a significant threat to environmental stability and human life. It is suggested that the policy should incorporate geological assessments into urban planning for sustainable development and disaster reduction in geologically sensitive regions.

TESTING OF WATER QUALITY AT LAKE ŠODERICA IN VARAŽDIN COUNTY

<p>The rapid growth of industrial, agricultural, and urban areas, along with rising living standards, invariably results in an increase in the amount of solid, liquid, and gaseous waste elements in water. Because of the variety of hazards that recreational waters pose to human health and well-being, a thorough evaluation of the sources and relative importance of the resulting health effects is necessary.  The testing of bathing water quality was conducted by determination of physical-chemical indicators at three locations in the lake Šoderica in Varaždin county. Lake Šoderica is an artificial lake formed by quarries and also used as a swimming area. The results demonstrated that the water was suitable for swimming and that all examined criteria agreed with the legislation. The results of the analyzed physical-chemical parameters show that the bathing water is satisfactory, but it is also necessary to determine the microbiological parameters. <strong><br /></strong></p>

Analysis of Tourism’s Impact on the Economy, Employment, and Export Potential of Kazakhstan

In Kazakhstan, the tourism sector exhibits significant potential to contribute to the national economy through its influence on employment dynamics, gross value added, and trade balances. However, challenges such as gender disparities in employment and varying contributions to goods and services exports highlight the need for deeper analysis. This study aimed to examine the impact of tourism on Kazakhstan’s economy, focusing on employment trends, gross value added, and trade performance. The data from 2012 to 2022 provided by the Bureau of National Statistics of the Republic of Kazakhstan were analyzed using the ARIMA model. The analysis showed that the average value added from tourism (GVAT) over the period amounted to 2,050.5 billion tenge, peaking at 3,270.1 billion tenges in 2022. The share of GVAT in GDP ranged from 2.9% to 4.1%, confirming its stable contribution to the economy. Foreign tourists' spending significantly contributed to GVAT growth, while domestic spending had a minimal impact. Key findings revealed stable growth in tourism’s contribution to GDP and employment, with significant disparities in male and female employment trends, particularly in recent years. The findings of the study emphasize the need to attract high-spending tourists, promote gender equality in employment, and expand exports of services as key areas for sustainable tourism growth in Kazakhstan. In future studies, it is proposed that the impact of environmental factors on tourism development and gender barriers to employment be studied in depth.

The Effects of the Economic Valuation of Education from the Aspect of the Distance Learning System

The aim of the work is to confirm the issues of economic evaluation of education and distance learning systems, and to affirm the methodology of valuation and economic valuation as a key issue of objective valuation and reasoning. The subject of research in this paper is the evaluation of the quality of teaching delivered through distance learning studies, i.e., how students perceive the quality of this kind of teaching. A particularly significant research problem posed in this work is whether and to what extent the effectiveness of the economic adoption of the distance learning system is influenced by the current education system. In writing this paper, the author relied on previous research in the area of economic growth and development analysis, as well as technology evaluation and invisible capital. A comparative analysis of the distance learning system, which the author has been dealing with for many years, is also provided. The results certainly indicate important trends, which were expected. The conducted analysis only gives indications for further research, which is certainly lacking in Bosnia and Herzegovina at the level of tertiary education. In the context of harmonizing policies on the labor market and education policy, it would be interesting to observe the speed of employment of students who graduate from certain economic universities and professional studies in the country, but for such adequate monitoring, it is not enough to analyze the data alone from the employment office, it would be necessary to analyze the quality of individual faculties. The key conclusion: E-learning is an educational process realized using computer and information technologies, enabling spatial distance between the user and the provider of educational services. E-learning, as one of the alternative methods, forms, or technologies of education, has evidently gained primacy in learning and work in recent years. All educational processes are simultaneously economic processes with the primary goal of minimizing investments and maximizing economic gains. Keywords: Economic Valuation, Economic Development, Education.

Развитие интегративной адаптивной среды обучения с использованием искусственного интеллекта для подготовки учителей в странах БРИКС

Integrating artificial intelligence (AI) into teacher professional development (PD) is a promising way to enhance teaching practices and foster innovation in education. However, the development and adoption of AI-based educational platforms face unique challenges in the BRICS region, including technological infrastructure and cultural diversity. This study aimed to identify key aspects of teaching in developing an integrative AI-assisted adaptive learning environment (ALE) in the region. Theoretical methods were used along with qualitative analyses of in-depth interviews and focus group discussions of 36 professors, researchers, and experts from Iranian universities. The findings of this study provided perspectives on the feasibility and effectiveness of developing a joint AI-ALE platform, emphasizing the importance of contextualizing AI initiatives and educational approaches to the needs and constraints of each country and underscoring the significance of local training programs, understanding areas of growth, clarifying values and cultures to be shared with other parties, designing educational resources compatible with collaborative platforms, and overcoming technological barriers. The study provided recommendations on capacity building and joint partnerships for educational innovation, and the development of AI-based teaching practices to open up new opportunities for PD of the next generation of educators for the digital landscape in the BRICS area.

Inclusive growth in rural Indonesia: exploring the tnteraction between technology and financial inclusion

Financial inclusion, as a form of ease in accessing financial services for the community, is key to creating inclusive growth. This research examines financial inclusion and technology in influencing inclusive growth in rural areas of Indonesia. The analytical approach is a Longitudinal Data Panel. The data is sourced from the Indonesia Family Life Survey (IFLS). The results of this study indicate that financial inclusion influences inclusive growth. On the other hand, technology plays an intermediate role between financial inclusion and inclusive growth in rural areas of Indonesia. The government also needs to provide facilities and security to develop technology.

Regular red-green-blue InGaN quantum wells with In content up to 40% grown on InGaN nanopyramids

Full color micro-displays with a pixel pitch of below 10 µm are needed for augmented and virtual reality applications. In the native emission approach, high efficiency Red-Green-Blue (RGB) pixels could be achieved using monolithically integrated InGaN based micro-LEDs. Here, we report the growth of high optical quality RGB InGaN/InGaN quantum wells grown on InGaN nanopyramids of diameter less than 1 µm by metal organic vapor phase epitaxy. We synthesized the nanopyramids by nanoselective area growth using an in situ patterned epitaxial graphene on SiC as an embedded mask. The RGB emission properties at different locations on the sample are dependent on the size of the InGaN nanopyramids. Advanced correlative analysis conducted on the same transmission electron microscopy lamella reveal a fully or at least nearly relaxed In0.13Ga0.87N core and very regular quantum wells emitting in the red range (620 nm) along the pyramid sidewalls with an In content up to 40%.