Several case studies on electric field distributions for two human bodies inside the car at 3.5 GHz–5G frequency band

The study investigates basically, the electric field distribution in a semi-closed region. Specifically, the present work focuses on the electromagnetic wave diffraction at 3.5 GHz in the vicinity of a car where two humans are located inside. The car is modeled as the perfect electric conducting object whereas the human bodies are assumed to be homogeneous lossy dielectrics. To obtain field distributions for different sceneries, the Method of Auxiliary Sources (MAS) is employed. To achieve this goal, the auxiliary sources due to each obstacle are distributed over the corresponding surface element. In the present study, two main different scenarios are considered. One or two cellphones as the source of electromagnetic waves are considered. These cellphones are operating at the proposed 5G frequency band in the European Zone. In this frequency range, the resonances are observed at 3.5 GHz which is in the range of a planned 5G communication frequency band. The present study aims to obtain quantitative and qualitative results for a better understanding of 5G healthy issues. Therefore, as a frontier study, the specific absorption rate (SAR) values are examined for the first time to answer some important questions related to 5G. For such a scenario, MAS is a very efficient, fast, and trustworthy approach to obtain field distribution at semi-closed regions.

Misconceptions about COVID-19 among older Rohingya (forcefully displaced Myanmar nationals) adults in Bangladesh: findings from a cross-sectional study

ObjectivesDue to low health literacy and adverse situation in the camps, there are possibilities of misconceptions related to COVID-19 among the older Rohingya (forcefully displaced Myanmar nationals or FDMNs) adults in Bangladesh. The present research aimed to assess the level of misconceptions and the factors associated with it among the older FDMNs in Bangladesh.DesignCross-sectional.SettingA selected Rohingya camp situated in Cox’s Bazar, a southeastern district of Bangladesh.ParticipantsInformation was collected from 416 conveniently selected FDMNs who were aged 60 years and above.Primary and secondary outcome measuresThe primary outcome was misconceptions related to the spread, prevention and treatment of COVID-19. Information on 14 different locally relevant misconceptions was gathered, each was scored as one, and obtained a cumulative score, ranging from 0 to 14, with a higher score indicating a higher level of misconceptions. A multiple linear regression model explored the factors associated with misconceptions.ResultsThe participants had an average of five misconceptions. The most prevalent misconceptions were: everyone should wear personal protective equipment when outside (84.6%) and its prevention by nutritious food (62.5%) and drinking water (59.3%). Other notable misconceptions included the spread of COVID-19 through mosquito bites (42%) and its transmissions only to the non/less religious person (31.4%). In regression analyses, memory or concentration problems, communication frequency with social networks, pre-existing conditions and receiving information from health workers were significantly associated with higher COVID-19 misconceptions. These misconceptions were less likely among those overwhelmed by COVID-19, having COVID-19 diagnosed friends or family members and receiving information from friends and family.ConclusionsOverall, we found that misconceptions were prevalent among the older FDMNs in Bangladesh. The associations have important implications for programmes to prevent and manage COVID-19 in these settings. Health workers need to be adequately trained to provide clear communication and counter misconceptions.

Design of a Microwave Power Detection System in the 5G-Communication Frequency Band

At present, the proposed microwave power detection systems cannot provide a high dynamic detection range and measurement sensitivity at the same time. Additionally, the frequency band of these detection systems cannot cover the 5G-communication frequency band. In this work, a novel microwave power detection system is proposed to measure the power of the 5G-communication frequency band. The detection system is composed of a signal receiving module, a power detection module and a data processing module. Experiments show that the detection frequency band of this system ranges from 1.4 GHz to 5.3 GHz, the dynamic measurement range is 70 dB, the minimum detection power is −68 dBm, and the sensitivity is 22.3 mV/dBm. Compared with other detection systems, the performance of this detection system in the 5G-communication frequency band is significantly improved. Therefore, this microwave power detection system has certain reference significance and application value in the microwave signal detection of 5G communication systems.

Constructive schemes to spacecraft attitude control with low communication frequency using sampled-data and encryption approaches

Purpose Recent spacecraft attitude control systems tend to use wireless communication for cost-saving and distributed mission purposes while encountering limited communication resources and data exposure issues. This paper aims to study the attitude control problem with low communication frequency under the sampled-data. Design/methodology/approach The authors propose constructive control system structures based on quantization and event-triggered methods for intra-spacecraft and multi-spacecraft systems, and they also provide potential solutions to shield the control system's data security. The proposed control architectures can effectively save communication resources for both intra-spacecraft and multi-spacecraft systems. Findings The proposed control architectures no longer require sensors with trigger-ing mechanism and can achieve distributed control schemes. This paper also provides proposals of employing the public key encryption to secure the data in control-loop, which is transmitted by the event-triggered control mechanism. Practical implications Spacecraft attempts to use wireless communication, yet the attitude control system does not follow up promptly to accommodate these variations. Compared with existing approaches, the proposed control structures can save communication resources of control-loop in multi-sections effectively, and systematically, by rationally configuring the location of quantization and event-triggered mechanisms. Originality/value This paper presents several new control schemes and a necessary condition for the employment of encryption algorithms for control systems based on event-based communication.

“There’s Somebody Like Me:” Perspectives of a Peer-to-peer Gynecologic Cancer Mentorship Program

Purpose: The Ovarian Cancer Research Alliance’s Woman to Woman (W2W) program is a peer mentorship program for women with gynecological cancer that was founded in 2004 and has expanded to 43 sites nationwide. An initial program survey was conducted in 2013, but no qualitative studies have investigated patient experiences with peer support programs for gynecologic cancer in the United States. The aim of this qualitative study was to capture mentor and mentee experiences giving and receiving peer support, including how relationships were initiated and developed.Methods: Hour-long, semi-structured interviews were conducted with both mentors and mentees. Interviews focused on the dynamics of the mentor-mentee relationship. Interviews were recorded, transcribed verbatim, and open-coded. A qualitative descriptive approach was used to organize findings into themes. Results: Sixteen participants (N=16) were interviewed (seven mentors and nine mentees.) Three broad themes emerged: (i) pathways to the program; (ii) how connection occurred; (iii) themes of compatibility. While program participants universally valued their match experience, frequency and mode of communication, as well as expectations of the match relationship were widely divergent among the program participants. Conclusion: The W2W peer mentorship program is a valuable resource for patients with gynecologic cancer. Refining the wants and needs of mentees including mode of communication, frequency of communication, type of support desired, identifying topics of mutual interest, and introducing the concept of recurrence may improve the connectivity experienced by mentor-mentee dyads.