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Transponders with nonlinear power harvesters can easily be supported with the addition of a single RF switching transistor.
Our results show that the present device operates as a radio-frequency single electron transistor.
Open accessProceedings ArticleDOI
01 Dec 2017
65 Citations
The performance evaluation indicates that the scheme can be tuned to realize long battery lifetime radio access for low-complexity devices.
The radio resource reduction contributes to reducing power consumed by a battery-operated BS.
Open accessJournal ArticleDOI
30 Jun 2017
129 Citations
This we believe is a major leap in the capability of battery-free devices and a step towards a fully functional battery-free cellphone.

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How does sunscreen protect the skin from the sun's harmful UV rays?
5 answers
Sunscreen protects the skin from the sun's harmful UV rays by absorbing, scattering, and blocking the radiation. It contains organic and inorganic filters that can absorb UV rays and dissipate the absorbed energy through various pathways. Some sunscreens also contain natural products or plant extracts with aromatic rings, such as flavonoids or polyphenols, which can absorb UV rays and reduce sunburn. Additionally, new sunscreen formulations have been developed that provide broad-spectrum photoprotection against solar radiation, including high-energy visible light. These formulations use innovative organic sun filters with unique optical properties to protect against a range of harmful effects on skin cells. Nanoparticles or nanoparticulate systems are also being explored as a form of sunscreen, offering benefits such as boosting SPF and minimizing adverse effects. Overall, sunscreen acts as a barrier between the skin and UV radiation, helping to prevent skin damage, photoaging, and the development of skin cancers.
What are the current research trends in foamed concrete?
5 answers
Foamed concrete is currently a topic of research due to its potential as an alternative to ordinary concrete. It offers advantages such as reducing dead loads on structures and foundations, contributing to energy conservation, and lowering production and labor costs. Researchers are analyzing the mechanical properties of foamed concrete and predicting its compressive strength using computational tools like MATLAB. The physical and mechanical properties of foam concrete are influenced by various elements, including mineral admixtures. Studies have examined the effects of fly ash, fine sand, and expanded perlite admixtures on foam concrete, considering factors such as compressive strength, flow duration, density, ultrasonic pulse velocity, and thermal conductivity. Additionally, research has focused on the effects of porosity, gradient, and impact velocity on the mechanical behavior and deformation mechanism of foamed concrete, using mesoscopic models and finite element analysis. Another area of research is improving the durability of foamed concrete by developing waterproofing materials, such as isobutyl triethoxysilane (IBTS) emulsion and graphene oxide/silane (GO/IBTS) composite emulsion, which reduce water absorption rates and enhance waterproof performance.
How did the mobile phone industry change the way people communicate?
5 answers
The mobile phone industry has revolutionized communication by making personal contact easier and more accessible. Mobile phones have become ubiquitous objects around the world, reaching even rural areas where fixed telephones were rare. The introduction of mobile phones has changed the way people coordinate with each other, allowing for last-minute arrangements and flexible meeting times and places. Additionally, mobile phones have played a significant role in intimate relationships, becoming part of the everyday communication landscape. The popularity of mobile phones and mobile text messaging has led to changes in language use and communication practices, such as the development of SMS language and new naming conventions. Furthermore, the use of smartphones has led to a shift towards communicating via the internet, replacing face-to-face communication for many individuals. Overall, the mobile phone industry has transformed communication practices and everyday life experiences for people around the world.
How effective was the COVID vaccination at preventing transmission?
4 answers
The COVID vaccination has shown effectiveness in preventing transmission of the virus. Vaccinated individuals have a lower risk of infection compared to the unvaccinated population. The overall vaccine effectiveness (VE) was found to be 65%, with variations observed among different age groups and vaccines. The BNT162b2 vaccine (Pfizer/BioNTech) demonstrated the highest VE at 79%. Additionally, the study on healthcare workers found a significant vaccine efficacy of 81.3% after complete vaccination and 76.9% after one standard dose against symptomatic disease. However, it is important to note that the effectiveness of the vaccines may decrease over time, as observed in the decline of transmission reduction for the delta variant after the second vaccination. Overall, the COVID vaccination has proven to be effective in reducing transmission, but ongoing monitoring and research are necessary to understand the long-term effectiveness and potential impact of emerging variants.
What is the definition of dengue fever?
3 answers
Dengue fever is a mosquito-borne viral illness caused by the dengue virus, which is transmitted by Aedes mosquitoes. It is characterized by symptoms such as fever, headache, rash, and evidence of bleeding in the body. In severe cases, it can lead to complications such as hemorrhagic fever and shock syndrome. Dengue fever is a major public health concern, particularly in tropical and subtropical regions, and its rapid worldwide spread has made it a significant burden on healthcare systems. Currently, there is no specific medicine or vaccine for treating dengue fever, and early diagnosis and accurate therapy are lacking.
What are the two main mechanisms of operation that are discussed?
4 answers
The two main mechanisms of operation discussed in the abstracts are the hole injection barrier in quantum dots light-emitting diodes (QLEDs)and the operation mechanism of a switching device. In the case of QLEDs, the hole injection barrier from the hole transport layer (HTL) to the quantum dot (QD) layer is identified as the most important efficiency limiting factor. The mechanism of hole injection in QLEDs is discussed using device simulation, and experimental results supporting this mechanism are presented. Additionally, the electron mobility of the HTL and carrier balance in the QD layer are shown to be other efficiency limiting factors. On the other hand, the operation mechanism of the switching device involves a sliding part, a transmission mechanism, and an elastic mechanism. The transmission end of the elastic mechanism and the connecting end of the sliding part are matched to enable smooth switching action and improve the performance of the operation mechanism.
What is the local density of optical states?
5 answers
The local density of optical states (LDOS) is a physical concept that characterizes the spontaneous emission of microcavities. It is calculated by establishing the relationship between the mode spectrum and the LDOS. The LDOS can be used to find the optimal location of a quantum well in the defect layer to couple more useful photons into the lasing mode for lasers. The LDOS is crucial in photonics engineering as it enhances the emission of photon sources and affects radiative heat transfer and photovoltaics. Upper bounds on LDOS in structured media can be evaluated based on bandwidth, material susceptibility, and device footprint, with no assumptions on geometry. The LDOS governs the efficiency of a classical antenna and modifies the spontaneous emission rate of a quantum emitter embedded in a nanostructured optical environment.
What is the epidemiological profile and incidence of Chikungunya in Brazil?
5 answers
Chikungunya is a viral disease caused by the Chikungunya virus (CHIKV) and transmitted by Aedes mosquitoes. Brazil has experienced several waves of CHIKV transmission since its introduction in 2013, with the highest number of cases in the Northeast region. The disease mainly affects females and individuals younger than 60 years old. The most common symptoms include fever, severe arthralgia, myalgia, and headache. Hospitalizations due to Chikungunya in children aged 0 to 11 years are less than 3%, and there have been no deaths related to the infection. The spatiotemporal dynamics of Chikungunya in Brazil show that the disease has spread across the country in multiple epidemic waves, with Ceará being the most affected state. Recurrences of Chikungunya have been observed in municipalities with few or no previously reported cases. The disease's transmission is influenced by population density and Aedes aegypti mosquito abundance. The epidemiological profile of Chikungunya in Brazil shows that females are the most affected, and there are differences in the age distribution of Chikungunya, dengue, and Zika virus infections.
Who gets amoebiasis?
3 answers
Amoebiasis is an infection caused by the protozoan parasite Entamoeba histolytica. It is most common in underdeveloped areas and is prevalent in tropical climate regions with poor or absent sanitary services. The infection occurs by ingesting parasite cysts from fecally contaminated food, water, or hands. While 90% of patients are asymptomatic, they can still be potential reservoirs for dissemination by shedding cysts. Some patients develop amebic colitis, acute dysentery, or chronic diarrhea, and occasionally life-threatening liver or brain abscesses. Sinonasal amoebiasis, a rare form of the infection, is more commonly found in immunocompromised individuals. It is important to note that amoebic infection can mimic other organisms or be incredibly scarce, making it challenging to recognize at unexpected sites.
Are workers more likely to get malaria than unworked individuals?
5 answers
Workers in malaria-endemic areas are more likely to get malaria compared to unworked individuals. This is because workers, such as miners, loggers, and seasonal migrant workers, are exposed to the risk factors of malaria due to their nature of work and living conditions. Factors such as age, gender, education, knowledge, behavior, attitudes, and environmental conditions contribute to the risk of malaria in these populations. Additionally, migrant workers who travel from non-malaria or mild malaria transmission areas to malaria-endemic areas for seasonal farm activities can contribute to the transmission of malaria to new or less malaria transmission areas. It is important to recognize these differences in malaria prevention behaviors and care-seeking practices among workers and implement tailored interventions to enhance malaria control and elimination efforts.
How to synthesis carbon quantum dot?
3 answers
Carbon quantum dots (CQDs) can be synthesized using various methods. One approach is to use low-cost precursors such as residual organics like coffee powder. Another method involves synthesizing CQDs through a variety of synthetic protocols, typically understood from considerations of reaction models and photoluminescence mechanisms. Additionally, CQDs can be produced from water hyacinth stalks using a one-pot gamma irradiation method, which has been compared to the conventional hydrothermal method. Another method involves hydrothermally synthesizing a liquid hydrocarbon aqueous solution and dispersing the synthesized product in a polymer aqueous solution. Furthermore, CQDs can be prepared by sealing a carbon quantum dot precursor aqueous solution in nanometer pores of precursor-silica gel and carrying out a hydrothermal carbonization reaction. These methods offer different approaches to synthesizing carbon quantum dots, providing options for researchers and manufacturers.