Remote Locations Research Articles

Embedded system controlled switching system for reconfigurable antennas

AbstractA multiband and reconfigurable antenna is the one of the main aspects in the communication system which has an extremely important role. An embedded based solution for the fast operation of a reconfigurable antenna to work in a specific operating frequency band is the solution of future technologies. Embedded based solution increases the speed by avoiding the dependence on manual control of the RF switching elements. In this paper, the proposed embedded system‐controlled switching mechanism operate the reconfigurable antenna in any one of the operating bands by a single command to be send from a remote location. The embedded system receives the command and configure a set of PIN diodes as per the modes. The proposed solution consists an Arduino UNO board as motherboard, SIM900A as GSM module to receive the command from user, biasing circuit to control the operation of PIN diode, PIN diode to reconfigure the patch pattern and a user mobile for sending AT command.The proposed model is successful and tested on proteus software 8.0. The model is also deployed on the newly designed multiple‐input‐multiple‐output antenna where the result shows the successful operation to achieve multiband frequency operation.

Professional nurses’ experiences of managing epilepsy at limited resource rural facilities in Limpopo and Mpumalanga Provinces, South Africa

BackgroundEpilepsy is a neurological disorder affecting approximately 50 million individuals globally, contributing significantly to the global disease burden. Professional nurses play a crucial role in the care and treatment of people living with epilepsy, ensuring their safety and well-being. Professional nurses frequently encounter challenges, such as restricted access to drugs, specialised equipment, and epilepsy treatment training. Despite these obstacles, professional nurses are essential to providing high-quality care to patients with epilepsy in remote locations. MethodsA qualitative design using explorative, descriptive, and contextual design was employed to achieve the objectives of the study. The sample comprised 20 professional nurses working in selected rural communities in Limpopo and Mpumalanga. Data was collected through in-depth individual interviews and analysed using Tesch's eight steps of data analysis. ResultsFour themes emerged from the data: experiences of professional nurses during management of epilepsy; inadequate training in management of epilepsy; insufficient supply of antiepileptic drugs and late presentation to local clinics. ConclusionThe study found that professional nurses experienced several challenges hindering the effective management of epilepsy. Cultural beliefs in supernatural causes of epilepsy significantly influence treatment preferences, consequently delaying diagnosis and treatment. Despite limited resources and cultural barriers experienced by professional nurses, they strive to provide appropriate care to minimise seizures. Ongoing education and training on epilepsy management is vital to enable professional nurses to keep up-to-date with current methods and new developments.

Physiological and molecular effects of contaminants of emerging concerns of micro and nano-size in aquatic metazoans: overview and current gaps in Antarctic species.

Although Antarctica is the most isolated continent on Earth, its remote location does not protect it from the impacts of human activities. Antarctic metazoans such as filter-feeding invertebrates are a crucial component of the Antarctic benthos. They play a key role in the benthic-pelagic carbon flux in coastal areas by filtering particles and planktonic organisms from the sediment-water interface. Due to their peculiar ecological niche, these organisms can be considered a wasp-waist in the ecosystem, making them highly sensitive to marine pollution. Recently, anthropogenic particles such as micro-nanoplastics and manufactured nanoparticles (MNP) have been classified as contaminants of emerging concern (CEC) due to their small size range, which also overlaps with the preferred particle size ingested by aquatic metazoans. Indeed, it has been demonstrated that some species such as Antarctic krill can ingest, transform, and release MNPs, making them newly bioavailable for other Antarctic filter-feeding organisms. Similarly, the production and use of anthropogenic MNP are rapidly increasing, leading to a growing presence of materials, such as nano-sized metal-oxides, in the environment. For these reasons, it is important to provide evidence of the adverse effects of such emerging contaminants at sub-lethal concentrations in environmental risk assessments. These contaminants may cause cascade effects with consequences not only on individuals but also at the community and ecosystem levels. In this review, we discuss the state-of-the-art knowledge on the physiological and molecular effects of anthropogenic MNP in Antarctic aquatic metazoans. We further highlight the importance of identifying early biomarkers using sessile metazoans as sentinels of environmental health.

Neural coding of space by time.

The intertwining of space and time poses a significant scientific challenge, transcending disciplines from philosophy and physics to neuroscience. Deciphering neural coding, marked by its inherent spatial and temporal dimensions, has proven to be a complex task. In this paper, we present insights into temporal and spatial modes of neural coding and their intricate interplay, drawn from neuroscientific findings. We illustrate the conversion of a purely spatial input into the temporal form of a singular spike train, demonstrating storage, transmission to remote locations, and recall through spike bursts corresponding to Sharp Wave Ripples. Moreover, the converted temporal representation can be transformed back into a spatiotemporal pattern. The principles of the transformation process are illustrated using a simple feed-forward spiking neural network. The frequencies and phases of Subthreshold Membrane potential Oscillations play a pivotal role in this framework. The model offers insights into information multiplexing and phenomena such as stretching or compressing time of spike patterns.

Multi‐objective optimisation framework for standalone DC‐microgrids with direct load control in demand‐side management

AbstractRenewable energy‐powered DC microgrids have emerged as a sustainable alternative for standalone power systems in remote locations, which were traditionally reliant on diesel generators (DIG) only. To ensure power quality and reliability, energy storage systems (ESS) and demand‐side management (DSM) techniques are employed, addressing the intermittent nature of renewable energy sources (RES). This manuscript presents a novel multi‐objective optimisation framework to determine the equipment sizing, depth of discharge (DoD) of ESS, and share of controllable loads contributing to DSM in a standalone DC microgrid incorporated with RES as a primary energy source and a backup DIG. The proposed optimisation strategy utilises genetic algorithm with the objectives of minimizing lifecycle cost and carbon footprint. A novel battery energy storage system (BESS) management criterion is introduced, which accounts for battery degradation in the lifecycle cost calculation. The minimum allowable DoD of the BESS is considered a decision variable in the optimisation problem to assess the impact of higher DoD on lifecycle cost improvement. MATLAB simulation results demonstrate that the proposed optimisation model significantly reduces the levelized cost of electricity and per unit carbon footprint compared to previous models. Additionally, it identifies an optimal range of DoD for the BESS to enhance the lifecycle cost of a standalone DC microgrid.

Location and access to health courses for rural students: an Australian audit

BackgroundThe undersupply of health professionals in rural areas impacts healthcare access for those living in rural Australia. A strategy to increase the rural health workforce is to recruit and educate rural people. However, long-standing inequities for rural Australians in accessing tertiary education persist. The aim of this study was to audit the 2023 offerings of Australian allied health, nursing, dental and medical university courses to identify geographical availability and those delivered online.MethodsA desktop audit of Australian allied health, nursing, dental and medical courses offered in 2023 was undertaken to identify the courses and delivery modes of those courses offered in regional, rural and remote locations. The audit involved searching lists of professionally accredited courses and university websites, which is publicly available information about health courses. Data were tabulated and descriptive statistics used for data analysis.ResultsThere were marked differences in online and rural course offerings across health professions in Modified Monash (MM) Model category 2–7 locations. Nursing/midwifery had the most courses while pharmacy, podiatry, dental and medicine had few offerings and optometry had none. Social work, nursing/midwifery and psychology also had the most online course offerings. Most courses were offered in MM2 and MM3 locations with few offerings in rural or remote areas. The availability of studying part-time was very limited and often this was only for the early years of the course. Inconsistencies relating to the course information on university websites existed relating to course delivery mode descriptions.ConclusionsThere is a lack of rural on-campus or online course offerings for some allied health disciplines, dentistry and medicine. Provision of end-to-end, flexible courses in rural areas or online is needed to reduce access barriers for rural students and to enable sustainable rural health workforce development.

Microplastic Particles and Fibers in Seasonal Ice of the Northern Baltic Sea.

Microplastic pollution is a pervasive issue, with remarkably high concentrations observed even in the most remote locations such as Arctic sea ice and snow. The reason for such large microplastic abundances in sea ice is still speculative and applies mainly to saline or freshwater conditions. In this study, we investigated seasonal ice core samples collected in March 2021 from the northern Baltic Sea (Gulf of Bothnia) for their microplastic distributions. The Baltic Sea is characterized by low salinity and can be ice-covered for up to six months annually. Microplastics were analyzed in the melted ice samples using an adsorption technique and Raman microscopy to identify their abundances, colors, shapes, and sizes to calculate their masses. Due to the strong dynamic of the ice layer and the repeated melting and freezing processes during the ice formation, no discernible trends in microplastic abundances, masses, or polymer types were observed throughout the ice core length. The average microplastic abundance (±SD) in the Baltic Sea ice was determined to be 22.3 ± 8.6 N L-1, with 64.9% of the particles exhibiting a particulate shape and 35.1% having a fibrous shape. The most prevalent polymer type was polyethylene terephthalate (PET), accounting for 44.4% of all polymers. This is likely due to the high proportion of PET fibers (93.8%). The majority of particle-shaped microplastics were identified as polyethylene (PE; 37.2%), followed by PET (17.2%), polyvinyl chloride (PVC; 15.9%), and polypropylene (PP; 15.9%). No correlations were found between microplastic concentrations and proximity to land, cities, industries, or rivers, except for PP mass concentrations and particle sizes, which correlated with distances to industries in Luleå, Sweden.

Entorhinal cortex represents task-relevant remote locations independent of CA1.

Neurons can collectively represent the current sensory experience while an animal is exploring its environment or remote experiences while the animal is immobile. These remote representations can reflect learned associations and be required for learning. Neurons in the medial entorhinal cortex (MEC) reflect the animal's current location during movement, but little is known about what MEC neurons collectively represent during immobility. Here, we recorded thousands of neurons in superficial MEC and dorsal CA1 as mice learned to associate two pairs of rewarded locations. We found that during immobility, the MEC neural population frequently represented positions far from the animal's location, which we defined as 'non-local coding'. Cells with spatial firing fields at remote locations drove non-local coding, even as cells representing the current position remained active. While MEC non-local coding has been reported during sharp-wave ripples in downstream CA1, we observed non-local coding more often outside of ripples. In fact, CA1 activity was less coordinated with MEC during non-local coding. We further observed that non-local coding was pertinent to the task, as MEC preferentially represented remote task-relevant locations at appropriate times, while rarely representing task-irrelevant locations. Together, this work raises the possibility that MEC non-local coding could strengthen associations between locations independently from CA1.

Harnessing Solar Power for Energy Efficiency in Deserted Telecommunications Rooms

The utilization of solar power in telecommunications rooms located in deserted areas presents a sustainable solution for enhancing energy efficiency and reducing operational costs. Desert environments, characterized by their harsh conditions and remote locations, pose unique challenges for maintaining power supply to telecommunications infrastructure. This article examines the advantages of using solar power to address these challenges, highlighting its benefits in improving energy efficiency, reliability, and sustainability.

Blue petrel electrocardiograms measured through a dummy egg reveal a slow heart rate during egg incubation

BackgroundSeabirds like penguins and petrels, living in Antarctic and sub-Antarctic regions, often feed hundreds or even thousands of kilometers away from the islands where they breed. They therefore adapted to endure prolonged fasting during egg incubation, enabling their partner to undertake foraging trips that can last up to two weeks. Aside from accumulating and consuming fat reserves, it is unclear whether seabirds have developed further adaptations to extended fasting periods. This lack of knowledge is in part due to their remote nesting location and their extreme sensitivity to manipulation. To overcome this lack of knowledge, we developed a non-invasive device to record the heart rate (HR) of burrow-nesting blue petrels (Halobaena caerulea) during egg incubation. For that, we encapsulated a small-size logger in a dummy egg to record electrocardiograms (ECGs) through the featherless incubation patch of the birds.ResultsThe blue petrels’ HR (208 ± 15 beats per min [bpm]; n = 6) that we recorded during egg incubation was slower than the HR predicted by two different allometric functions regressing HR against body mass (242 and 250 bpm). Blue petrels’ HR also presented cyclical variation correlated to respiration, resembling the physiological Respiratory Sinus Arrhythmia (RSA) described in humans and other species, and that is mainly modulated by the vagal nerve. Moreover, the basal HR of incubating blue petrels increased about every minute during egg movements that presumably reflect egg turning, important for embryo survival and development. During these events, blue petrels’ HR increased up to a maximum of 296 ± 27 bpm for 18 ± 2 s (n = 6). We estimated that those egg movements increased energy expenditure (EE) by 8.4 ± 1.3%, which is approximately 10 times less than the energy increase induced by the disturbance linked with the removal of the dummy egg at the end of the experiment. Interestingly, we noticed that the beginning of HR increase preceded egg movements by 4.3 ± 0.9 s (n = 6), as if birds needed to gradually increase their metabolism to achieve the following action. As well, blue petrels needed 9.1 ± 1.3 s (n = 6) to recover basal levels of HR after the end of egg movements.ConclusionWe recorded for the first time ECGs, HR and RSA in blue petrels in a completely non-invasive way. This allowed us to observe (1) slow basal HR during egg incubation, which could save energy for prolonged fasting and (2) temporal HR increase, possibly necessary to reposition the egg for proper embryonic development.

Empowering Youths for Social Changes: Educational Initiatives in Gandaki Rural Municipality, Ward No. 6

The study aims to discern the role of education on youth empowerment to promote health and sanitation, gender equality and awareness to address social issues for social changes in Gandaki Rural Municipality ward number 6. The survey study identified various challenges related to education for youth empowerment. The descriptive research design was used. The focused group discussions using semi-structured questionnaires were administered to the seven youths of Chepang/Praja community aged 15-19 years old residing in the ward number 6. The sample was selected using purposive sampling technique. The education the youth of Chepang/Praja community empowered through education demonstrated the ability to promotes health and sanitation, gender equality and create awareness to address social issues within their society. Major challenges identified includes reluctance to change by the senior citizens, lack of priority to the training that didn't provide allowances, the voices of youth are unheard, remote geographical location, lack the access to transportation, lacks appropriate resources and migration. The study suggested that the education brings positive social changes through empowering the youth in the promotion of health and sanitation, gender equality and creation of awareness to address the social changes.

Feasibility analysis of hybrid photovoltaic, wind, and fuel cell systems for on–off‐grid applications: A case study of housing project in Bangladesh

AbstractThis study investigates the viability of hybrid photovoltaic (PV), wind, and fuel cell (FC) systems for on‐grid and off‐grid operations for the Ashrayan‐3 housing project in Bangladesh, with an increased focus on sustainable energy solutions. Motivated by the issue of the delivery of proper and sustainable energy services to remote locations, we conducted an extensive analysis of load demand and found that an average daily demand of 46,176.65 kWh exists, with a peak load of 4852.8 kW. In this research, the HOMER software has been used to make a simulation of five different hybrid system configurations with differing mixes of renewable technologies. From the analyses, the systems based 100% on renewable resources suffer more initial capital costs, with a total net present cost increase of up to 20%, in comparison to conventional systems. On the other hand, the systems give much lower operational costs and cost of energies (COEs) of a minimum of $0.0253/kWh, reported from the on‐grid PV‐based system. On the other hand, the off‐grid PV–FC–wind turbine system showed a COE of $0.286/kWh, along with a decrease in CO2 emissions by about 15,000 kg/year, showing a 30% decrease, compared with on‐grid systems. The results form a basis for the conclusion that such hybrid renewable energy systems are both economically and environmentally feasible. They can reduce COEs by up to 70% in off‐grid systems. This proves that the quality of life and energy security in developing regions will be highly increased, supporting the goals of sustainable development.

Fiberoptic Laser-Induced Breakdown Spectroscopy System for in situ Measurement in a Hazardous Environment

We report the development of a novel fiberoptic laser-induced breakdown spectroscopy (FOLIBS) system for material characterization applications. The system utilizes a 1000-µm optical fiber to transport the laser beam to remote locations for elemental analysis via laser-induced breakdown spectroscopy. Air-fiber interface damage, internal damage, and air breakdown issues during laser-fiber coupling are identified and corresponding solutions are presented. For evaluating the physical properties of the plasma generated by the FOLIBS system, spectroscopic characterization is carried out using a titanium sample. The spectral features collected from a natural uranium sample are also presented. Hence, this rapid, remote, and flexible measurement technique is promising for in situ measurements in hazardous environments in nuclear energy, nuclear safeguards, and nonproliferation applications.

A Design and implementation of a sustainable microcontroller based solar power automatic water irrigation control and monitoring system

The major cause of the shortage of land reserve water owing to the lack of rainfall makes the proper operation of irrigation systems extremely important. A major concern for farmers these days is water scarcity. Pakistan is an important agricultural nation and major part of economy depend on agriculture. This study analyses the soil moisture monitoring and automatic plant watering system since it is really helpful in all kinds of weather. In this study a prototype is design and implement using Arduino-based automation sensors are employed for the control and observation of a solar powered smart irrigation system. An Arduino based remote irrigation system developed for the agricultural plantation, which is placed at a remote location and requires water, provides for plantation when the moisture of the earth drives under the set-point rate which turns on the pump on autopilot. An estimation was carried for solar power energy potential agriculture system condition using soil and humidity sensors. The measurements and mathematical formulation were observed to monitor effectivity of solar based power generation. This analysis is conducted for 20 Watt power panel integrated with 5-watt electrical drive with battery capacity 1200 m-Ah. A modified energy model was used to determine the agricultural load for a 5-watt dc motor. The results showed a cumulative analysis to implement this system inspired by smart sustainable clean renewable energy technologies which meet the farmer’s demands significantly increase the productivity of farming and reduce wastage of water and energy.

Mapping malaria transmission foci in Northeast Thailand from 2011 to 2021: approaching elimination in a hypoendemic area

BackgroundThailand is approaching local elimination of malaria in the eastern provinces. It has successfully reduced the number of cases over the past decade, but there are persistent transmission hot spots in and around forests. This study aimed to use data from the malaria surveillance system to describe the spatiotemporal trends of malaria in Northeast Thailand and fine-scale patterns in locally transmitted cases between 2011 and 2021.MethodsCase data was stratified based on likely location of infection and parasite species. Annual Parasite Index per 1000 population (API) was calculated for different categories. Time series decomposition was performed to identify trends and seasonal patterns. Statistically significant clusters of high (hot spots) and low (cold spots) API were identified using the Getis-Ord Gi* statistic. The stability of those hot spots and the absolute change in the proportion of API density from baseline were compared by case type.ResultsThe total number of confirmed cases experienced a non-linear decline by 96.6%, from 1061 in 2011 to 36 in 2021. There has been a decline in both Plasmodium vivax and Plasmodium falciparum case numbers, with only four confirmed P. falciparum cases over the last two years—a 98.89% drop from 180 in 2011. API was generally higher in Si Sa Ket province, which had peaks every 2–3 years. There was a large outbreak in Ubon Ratchathani in 2014–2016 which had a high proportion of P. falciparum reported. The proportion of cases classified increased over the study period, and the proportion of cases classed as indigenous to the village of residence increased from 0.2% to 33.3%. There were stable hot spots of indigenous and imported cases in the south of Si Sa Ket and southeast of Ubon Ratchathani. Plasmodium vivax hot spots were observed into recent years, while those of P. falciparum decreased to zero in Ubon in 2020 and emerged in the eastern part in 2021, the same year that P. falciparum hot spots in Si Sa Ket reached zero.ConclusionsThere has been a large, non-linear decline in the number of malaria cases reported and an increasing proportion of cases are classed as indigenous to the patient’s village of residence. Stable hot spots of ongoing transmission in the forested border areas were identified, with transmission likely persisting because of remote location and high-risk forest-going behaviours. Future efforts should include cross-border collaboration and continued targeting of high-risk behaviours to reduce the risk of imported cases seeding local transmission.

Photo-rechargeable zinc-ion battery using highly ordered and vertically oriented C@VO2/ZnO microrod arrays

Development of photo-rechargeable batteries is a potential resolution for supplying off-grid solar power system in remote locations. Here, we present a photo-rechargeable zinc-ion battery (PRZIB) that can be directly recharged by the light without external photovoltaic cells and controllers. A highly ordered and vertically oriented ZnO microrod arrays (ZMRAs) were prepared using hydrothermal method in micron-scale patterned ZnO substrate defined by lithographic technology, which are used to incorporate with carbon encased vanadium oxide (C@VO2) nanocomposite to form a large specific surface area of three-dimensional network of C@VO2/ZnO heterojunction. PRZIB was assembled using C@VO2/ZMRAs structure as the photovoltaics as well as intercalation host for Zinc-ions, which demonstrates a photo-conversion efficiency of 3.3 % and gravimetric capacities of 286.0 mAh g−1 and 339.3 mAh g−1 at 500 mA g−1 in dark and light conditions. An excellent long-term cycling stability was achieved with a capacity retention of 88.79 % after 300 cycles at 1000 mA g−1 in dark condition. It is suggested that the distinctive morphologies and structure of C@VO2/ZMRAs provide effective strategies for enhancing photo-electrochemical redox reaction kinetics.

HOSPITAL ADMINISTRATION IN A PERIPHERAL REMOTE LOCATION HOSPITAL: A EVIDENCE BASED STUDY

Objective: The organisation of the human society has undergone a unique transition throughout the last decades. With the rise of ever growing technologization and disruptive innovations, populations also demand more social and environmental initiatives from firms and governments. In 2015, the United Nations (UN) member states agreed upon a 2030 Agenda for Sustainable Development. Developing a sustainable UHC is decisive to ensure better economic prospects and social equality across socioeconomic classes. This can be achieved by lowering the barriers to access health services to the most vulnerable groups and improve mortality and disability rates in the potential workforce. Methods: The present study was conducted in a remote location defence hospital catering to the health care needs of serving personnel of Indian armed forces and civilians residing in this peripheral area. The basic specialties including Obstetrics, paediatrics, medicine and general surgery are provided at this centre 24*7 by the dedicated medical officers of Indian Armed forces. Results: Sustainability of care continuously evolves towards becoming a major factor for public healthcare organisations, and more accountability will likely be demanded of managers to deliver on each aspect of its triple bottom line. This study shows that prevention and patient empowerment both carry great potential to attain this objective. Conclusion: It is necessary to set priorities and act according to available resources and organisational vision. The central threats to sustainability of public health care welfare systems in peripheral hospitals identified, namely the ageing population and rise in chronic diseases. UHC at a meso and micro level, could provide a much better rationale for scholars to evaluate the need for change, and contribute to draft more inclusive sustainable strategies.

An Analysis of Profitability of Sarva Haryana Gramin Bank

The most significant measure of financial performance is profitability. The degree of efficiency, productivity, and cost-effectiveness is selected through the bank's profit, which may be viewed as a composite index of its performance in numerous areas of operation. This study evaluates Sarva Haryana Gramin Bank's (SHGB) profitability performance. It is a banking establishment with operations in several Haryana areas. It was established to offer financial and banking services in remote locations. This research report examines the Sarva Haryana Government Bank's profitability performance. The secondary data used in this study were gathered from a variety of sources, including the RBI Bulletin, the Sarva Haryana Gramin Bank's annual reports, the Annual Reports of NABARD, and numerous research articles. The study's fiscal years of 2017–18 through 2022–2023 are covered. It has assessed the management performance of the bank using statistical tools such as computed annual growth rate and ratio analysis to assess Sarva Haryana Gramin Bank's profitability.

Remote work and location preferences: a study of post-pandemic trends in Italy

This study investigates how working remotely, by reducing workplace commuting, weakens the limitations connected to residential mobility and enables Tiebout sorting. We focus on the Italian context, where a strong culture of in-person workplace attendance limits workers’ ability to live farther from their workplace. We leverage the natural experiment of COVID-19 containment measures to shed light on the spatial implications of an increased remote work adoption. We overcome the unavailability of official data by collecting primary data in early 2022 through an original survey of our design on a sample of workers in 12 metropolitan areas. To address the challenges of analyzing the phenomenon in a still-developing context, we ask questions on both their actual and intended moving behavior in relation to remote work availability. Using a case–control study design, we find significant evidence that expecting to work remotely more frequently in the long term increases the likelihood of being interested in moving, or having done so already since the pandemic outbreak.

The Canadian Fire Spread Dataset

Satellite data are effective for mapping wildfires, particularly in remote locations where monitoring is rare. Geolocated fire detections can be used for enhanced fire management and fire modelling through daily fire progression mapping. Here we present the Canadian Fire Spread Dataset (CFSDS), encompassing interpolated progressions for fires >1,000 ha in Canada from 2002–2021, representing the day-of-burning and 50 environmental covariates for every pixel. Day-of-burning was calculated by ordinary kriging of active fire detections from the Moderate Resolution Imaging Spectroradiometer and the Visible Infrared Imaging Radiometer Suite, enabling a substantial improvement in coverage and resolution over existing datasets. Day of burning at each pixel was used to identify environmental conditions of burning such as daily weather, derived weather metrics, topography, and forest fuels characteristics. This dataset can be used in a broad range of research and management applications, such as retrospective analysis of fire spread, as a benchmark dataset for validating statistical or machine-learning models, and for forecasting the effects of climate change on fire activity.