RF energy harvesters for wireless sensors, state of the art, future prospects and challenges: a review

The power consumption of portable gadgets, implantable medical devices (IMDs) and wireless sensor nodes (WSNs) has reduced significantly with the ongoing progression in low-power electronics and the swift advancement in nano and microfabrication. Energy harvesting techniques that extract and convert ambient energy into electrical power have been favored to operate such low-power devices as an alternative to batteries. Due to the expanded availability of radio frequency (RF) energy residue in the surroundings, radio frequency energy harvesters (RFEHs) for low-power devices have garnered notable attention in recent times. This work establishes a review study of RFEHs developed for the utilization of low-power devices. From the modest single band to the complex multiband circuitry, the work reviews state of the art of required circuitry for RFEH that contains a receiving antenna, impedance matching circuit, and an AC-DC rectifier. Furthermore, the advantages and disadvantages associated with various circuit architectures are comprehensively discussed. Moreover, the reported receiving antenna, impedance matching circuit, and an AC-DC rectifier are also compared to draw conclusions towards their implementations in RFEHs for sensors and biomedical devices applications

Institutions and Innovation: Evidence from Countries at Different Stages of Development

This paper empirically analyses the impact of institutions, both formal and informal, on innovation performance of sampled countries at different stages of development. Data of 72 sampled countries on Research and Development Expenditures, numbers of article published, human capital, trade openness, internet users are collected from United Nations Educational, Scientific and Cultural Organisation (UNESCO), International Country Risk Guide (ICRG) and World Bank database. Formal and informal institutions indexes are constructed using data from Country Risk Guide and The World Value Survey (WVS). Fixed effect and System GMM technique are used to estimate the dynamic relationship between innovation performance and institutional indexes. The study finds positive significant effect of institutions on innovation in case of aggregate sample of developed and developing countries. However, the effects of formal institutions are more significant in case of sample of developed countries, while in developing countries informal institutions are found more effective than formal institutions in affecting innovation performance. The results also show that both formal and informal institutions are supplementary to each other in case of developing countries. Therefore, it is suggested that focus should be given to informal institutions. Moreover, collective initiatives be encourage in developing countries to have diverse ideas from different sectors of the countries. In addition, developing countries should initiate collaborative research projects with technologically advanced countries research and education institutions so as to learn from each other’s ideas and experiences. Keywords: Formal Institutions, Informal Institutions, Innovatio

Comparative Analysis of Fly Ash-based Geopolymer Concrete and Ordinary Portland Cement Concrete

In Pakistan, the high year-over-year growth in the construction industry has led to a significant increase in the cost of construction materials, particularly cement. To reduce the cost of construction, alternative materials need to be sought. In Pakistan, approximately one million tons of fly ash are generated each year from coal-fired thermal power stations. A sample of fly ash was obtained from the 125 Megawatts Coal Fired Power Station Lakhra in Khanot, Hyderabad, Sindh Pakistan.A study was conducted on fly ash-based geopolymer concrete, using test data to identify the factors that influence its properties and to develop a simple method for designing geopolymer concrete mixtures. The mix design for fly ash was carried out using the standard ACI method. Various trial mixes were prepared using arbitrary ratios of cementitious materials, fine and coarse aggregates. The compressive strength of ordinary Portland cement (OPC) concrete was 64% and 57% for geopolymer concrete (GPC) after 7 days. At 14 days, the strength of OPC was 83% and 76% for GPC. The strength of OPC reached 97% after 28 days, while GPC reached 91%

MinION as a Teaching tool in a Graduate course in Pakistan

Genomics is a rapidly evolving field of study that is increasingly being utilized as a tool to detect ethnic and tribal-specific mutations that may be the key to rare and common diseases with higher prevalence in the population under study [1]. However, researchers and science educators in remote areas can often find it difficult to access the latest genetic technologies, probably due to its high costs and lack of suitable infrastructure. Recent technological innovations are resulting in portable, low-cost instruments that enable next-generation sequencing in remote environments, offering new opportunities to generate a more widespread network of trained geneticists [2]. We need to formalize educational efforts to teach students and young researchers with hands-on training to excel in molecular and bioinformatics knowledge. Here, we report our experience of using the MinION pocket size sequencer in a graduate course. The graduate course had some theoretical lectures that explained the basic principles of genomics followed be practical sessions. We hope that the training material developed during this course will provide the community with useful tools to help educate future generations of genome scientists in Pakistan.

Green-Agile Maturity Model: An Evaluation Framework for Global Software Development Vendors

Agile methods are extensively adapted by software development organizations due to the competitive benefits it offers. In recent years global software development (GSD) projects practice agile methods as prominent methods to deliver the software in increments with utmost user satisfaction and affordable cost. Beside the use of agile methods, the software industry has also considered the green aspect of software, to be in line with the demands of the organizations and the world technological ecosystem. The green and sustainable feature of software should focus both the energy and resource efficiency key factors. This phenomenon of embedding the green flavor in software has emerged a new research area, green software engineering, that promises the development of eco-friendly software with minimum energy and use of less computing resources, to trim down the adverse effects on both society and environment. The principal objective of this research study is to design and develop a multi-level Green-Agile Maturity Model (GAMM) to assess the GSD vendors' agile maturity in terms of green software development. The model has been built in four phases. In phase I and II, systematic literature review (SLR) was performed to identify the success factors and risk factors that either supports or hinders the green and sustainable software development respectively by practicing the agile methods in GSD. The results have been validated from 106 relevant experts, dealing with agile and green software projects, through questionnaire survey. The experts' demographic represents 25 different countries. We also identified the industry practices through SLR and survey, to address our identified critical factors. Phase III of this research deals with development of the GAMM by categorizing the identified factors into seven Green-Agile maturity levels. A similar approach has been used in other models such as Capability Maturity Model Integration (CMMI), Implementation Maturity Model (IMM) and Software Outsourcing Vendors Readiness Model (SOVRM). In phase IV of this research, five case studies were conducted at GSD organizations, to evaluate the structure and efficacy of the GAMM, while as a major contribution, this paper presents our developed model, the GAMM, which aims to assess the green-agile maturity of the GSD vendors in terms of green and sustainable software development.Qatar University [IRCC-2021-010]

Impact of Stress on Software Engineers Knowledge Sharing and Creativity (A Pakistani Perspective)

Software development involves technology as well as human efforts. Software engineering is supportive to create a quality of product by adopting the process of sharing knowledge. A lot of research was conducted on the technical side but human side of software development disregarded. Knowledge and creativity considered major factors for improving the software quality. Currently professionals working in the field of software engineering are under impressive pressure which cause stress for the Software engineers. It is highly desirable to conduct an empirical study on impact of stress on software engineers knowledge sharing & creativity. The major motivation for this study is to investigate the impact of job stress factors which can affect the software engineering knowledge sharing capabilities and creativity. The research is based on industrial assessment. For conducting this study we developed a questionnaire based on Stress Factors. Statistical analyses are performed through SPSS tool. On the basis of the results from the survey, we proposed some strategies for those factors that have high impact on software engineers and try to mitigate their affect. These results highlight stress factors and their impact on software engineers knowledge sharing and creativity, working in Pakistani software industry

Impact of Stress on Software Engineers Knowledge Sharing and Creativity (A Pakistani Perspective)

Software development involves technology as well as human efforts. Software engineering is supportive to create a quality of product by adopting the process of sharing knowledge. A lot of research was conducted on the technical side but human side of software development disregarded. Knowledge and creativity considered major factors for improving the software quality. Currently professionals working in the field of software engineering are under impressive pressure which cause stress for the Software engineers. It is highly desirable to conduct an empirical study on impact of stress on software engineers knowledge sharing & creativity. The major motivation for this study is to investigate the impact of job stress factors which can affect the software engineering knowledge sharing capabilities and creativity. The research is based on industrial assessment. For conducting this study we developed a questionnaire based on Stress Factors. Statistical analyses are performed through SPSS tool. On the basis of the results from the survey, we proposed some strategies for those factors that have high impact on software engineers and try to mitigate their affect. These results highlight stress factors and their impact on software engineers knowledge sharing and creativity, working in Pakistani software industry

Biosafety risk assessment approaches for insect-resistant genetically modified crops

Background: Environmental risk assessment (ERA) is imperative for commercial release of insect resistant, genetically modified crops (IR-GMCs).An insect specific, spider venom peptideω-HXTX-Hv1a (Hvt) was successfully expressed in cotton plants. The cotton plants producing Hvt protein have demonstrated resistance against economically important insect pest species. The study was performed to assess the effects of Hvt producing cotton plants on Honey bees (Apis mellifera).Methods: Three approaches were used to evaluate the effects of Hvt protein on adults of honeybees; whole plant assays in flight cages, in vitro assays with pollen of Hvt-cotton, and assays with elevated levels of purified Hvt protein. Pollens of Bt cotton or purified Bt proteins were used as control.Results: The field experiments did not yield any meaningful data due to high rate of mortality in all treatments including the control. However, the laboratory experiments provided conclusive results in which Hvt, purified or in pollens, did not affect the survival or longevity of the bees compared to the control. During the course of study we were able to compare the quality, effectiveness and economics of different experiments. Conclusions: We conclude that Hvt either purified or produced in cotton plants do not affect the survival or longevity of honey bees. We are also of the view that starting at laboratory level assays not only gives meaningful data but also saves a lot of time and money that can be spent on other important questions regarding safety of a particular transgenic crop. Hence, a purpose-based, tiered approach could be the best choice for pre-release ERA of IR-GMCs.

Effect of electrolyte (NaCl) and temperature on the mechanism of cetyl trimethylammonium bromide micelles

In the last few decades, surfactants and electrolyte interaction has gained considerable attention of researchers due to their industrial and domestic applications. In this work, the effects of electrolyte (NaCl) on the critical micelle concentration (CMC) of the cationic surfactant cetyltrymethyl ammonium bromide (CTAB) at different temperatures were investigated through different techniques such as conductometry, surface tensiometer and viscosimeter. The results showed that the values of CMC of CTAB decreased with the increase in temperature as well as with the addition of NaCl. The value of CMC for pure CTAB was calculated 0.98M at 303K, which was observed to decrease as temperature increased and got value of 0.95M at 318K. Moreover the addition of electrolyte NaCl into the surfactant lead to lowering of the CMC and obtained value of 0.90M at 3M of NaCl, indicating significant electrostatic interactions between surfactant and electrolyte. Moreover the degree of ionization(α) calculated for pure cationic surfactant CTAB was 0.219, which tends to increase with the addition of electrolyte, while that of counter ion binding values (β) was observed to decrease from 0.780 to 0.201. Furthermore, the conductivity of charged micelle of surfactant and free ions of electrolyte contributed to electric conductivity of aqueous micellar solution of surfactant. The results can be helpful to develop better understanding about interaction between electrolyte and surfactant

Histomorphological changes in gonads of Clupisoma naziri during spring and summer season

Present study was conducted to analyse the effect of breeding and non-breeding seasons on histomorphological changes in gonads of Clupisoma naziri. In Khyber Pakhtunkhwa and northern Punjab, Pakistan, 43 mature fish of both sexes were gathered from the Indus River and its tributaries. In the non-breeding season (spring), both testis and ovaries went through a preparatory phase, with thick tunica albuginea and fast spermatogenesis in testes and the formation of cortical alveoli or yolk vesicles in the cortex of the cytoplasm in ovaries. The testicular lobules were loaded with spermatozoa and some spermatogenic cells during breeding season (summer), while the ovaries were filled with mature ovarian follicles. The breeding season is marked by spermatozoa leaking freely from testes and ovaries brimming with completely mature eggs. The gonadosomatic (GSI) results are consistent with the histomorphological results of gonads, as their values peak during breeding season and drop during non-breeding season. C. naziri breeds once a year during the summer season, according to the current study, and this information will aid aqua breeders in the culturing of this commercially significant catfish in Pakistan