2.4 GHz Inkjet-printed RF Power Harvester on Bulk Cardboard Substrate

Inkjet-Printing Technology provides the ability of fabricating electronic circuits on different substrates such as: cardboard, wood, kapton and etc. The advantages of this technology are reduction in production cost in comparison to conventional laminate substrates and also being environmentally-friendly circuits which is one of the main goals in any manufacturing field. Having environmentally-friendly and low cost productions are possible by utilizing paper as the substrate and Inkjet-printing as the fabrication technology. In addition, reducing the power consumption in any circuit is an important factor in designing a circuit. In any wireless portable device, usage of battery causes a limitation in application space and decreases the lifetime of devices .Since increasing the lifetime of battery is still infeasible, power harvesting energy is one of the solutions in designing battery-less circuits. Power harvesting is a process by which energy is delivered by scavenging DC power from ambient sources. The ambient sources for power harvesting can be light, temperature, motion and electromagnetic in RF (Radio Frequency) range. Among all these sources, ambient RF energy, in both indoor and outdoor is generally available in all hours at different frequency bands. Hence RF energy harvesting is one the most popular type of power harvesting. The ambient RF sources are: Wi-Fi transceivers,AM/FM radio, television broadcasting, mobile networks and communication devices. In this Project, experimental investigations on the inkjet-printed RF power harvester for 2.4GHz are presented. An one stage discrete rectifier based on a voltage doubler structure and a planar monopole antenna are fabricated on cardboard using inkjet printing.The performance of the whole system is examined by measuring the output voltage of the RF power harvester. By the utilization of the proposed idea, the fabrication of low cost Environmental-friendly battery-less wireless modules is conceivabl

A 3-43ps time-delay cell for LO phase-shifting in 1.5-6.5GHz beamsteering receiver

This paper describes a digital-friendly passives-less time delay cell that generates programmable phase-shifts for down converting front-end in LO-based beamsteering receiver. Cell design supports 1.5–6.5GHz broadband receiver operation and cell layout occupies an area of only 15×16.5μm 2 including power supply rails and control logic. Simulated in 28nm CMOS technology, delay cell exhibits 6 distinct delay values {3, 3.5, 17, 19, 24, 43}ps consuming at most 220μ[email protected] reviewe

The effect of main ecological factors on essence yield percent of myrtus communis in different forest sites of Lorestan province

مقدمه: مورد Myrtus communis درختچه همیشه سبزی است که از خانواده Myrtaceae می‌باشد. در نظر گرفتن ویژگی‌های محل رویش و موقعیت گیاه در طبیعت از عمده عواملی است که می‌تواند بر میزان اسانس و مواد موثره گیاه تاثیر زیادی داشته باشد. بحث و نتیجه‌گیری: رویشگاه کرکی کمترین میزان تولید اسانس را در بین رویشگاه های مورد استان لرستان به خود اختصاص داده است. همچنین در مجموع جهت جنوب غربی با جهت‌های شمالی و جنوبی به لحاظ میزان اسانس تفاوت معنی‌داری نشان داد. یافته‌ها: نتایج حاصل از ضریب همبستگی پیرسون، وجود ارتباط مستقیم معنی‌دار بین ارتفاع از سطح دریا و درصد بازده اسانس (358/0r= و049/0p= ) و همچنین ارتباط معکوس بین میزان سدیم خاک و درصد بازده اسانس (405/0r = و 027/0p = ) را نشان داد. بین درصد بازده اسانس در رویشگاه‌های مختلف و همچنین جهات جغرافیایی مختلف اختلاف معنی‌داری مشاهده گردید. مواد و روش‌ها: به منظور بررسی تاثیر عوامل اصلی اکولوژیکی موثر بر میزان اسانس درختچه مورد، ازچندین رویشگاه اصلی مورد دراستان لرستان نمونه برداری به عمل آورده و از هر منطقه 40 گرم برگ خشک اسانس گیری شد و درصد بازده اسانس برگ های مناطق مختلف به دست آمد. علاوه بر آن مولفه های اصلی فیزیوگرافیک هر کدام از رویشگاه ها (شیب، جهت دامنه، ارتفاع از سطح دریا) نیز اندازه گیری شد. از بین عوامل اکولوژیک قابل اندازه گیری نیز عناصر سدیم، پتاسیم، منیزیوم و کلسیم و میزان اسیدیته و شوری خاک مورد اندازه گیری قرار گرفت

A Delay-Based LO Phase-Shifting Generator for a 2-5GHz Beamsteering Receiver in 28nm CMOS

| openaire: EC/H2020/704947/EU//ADVANTAG5This paper proposes a wideband 2-5GHz LO phase-shifting generator based on two digitally controlled delay lines. The concept is verified on a two-channel beamsteering direct conversion receiver prototype implemented in 28nm CMOS. The novel generator provides both tunable phase-shifting and generation of I/Q components, achieving picosecond time resolution. The generator consumes 4.5-11.2mW and occupies 0.021mm.sq.Peer reviewe

A 2-5.5 GHz Beamsteering Receiver IC With 4-Element Vivaldi Antenna Array

| openaire: EC/H2020/704947/EU//ADVANTAG5In this article, we present a four-element Vivaldi antenna array and beamsteering receiver IC for the fifth-generation mobile network (5G) new radio (NR). The implemented receiver utilizes a delay-based local-oscillator phase shift technique for accurate beamsteering, and it exhibits 1° to 2.4° phase tuning capability for 2-5 GHz bandwidth accordingly. On-chip delay measurement is performed with pilot signal generation and delay estimation capable of 2-ps accuracy. The IC is fabricated on 28-nm CMOS technology, it occupies an area of 1.4x1.4 mm^2, including bonding pads, and consumes 22.8 mW at 2 GHz for single-receiver path operation. The receiver demonstrates wideband over-the-air reception with the prototype antennas.Peer reviewe

Normal weight obesity and cardiometabolic risk factors : a systematic review and meta-analysis

Background :Obesity is one of the most significant causes of morbidity and mortality worldwide. Current studies suggest a new type of obesity, normal weight obesity (NWO), which is defined as having a normal body mass index (BMI), but a high-fat percentage increases the risk of cardiometabolic risk factors (CMRFs). This systematic review and meta-analysis aimed to pool the association between NWO with CMRFs.& nbsp;Methods:& nbsp;A systematic search of the literature in all available electronic databases, including Scopus, Web of Science, EMBASE, and PubMed, was performed until October 2021. All English studies that assessed the association of NWOs [compared to normal weight non-obese (NWNO)] and the CMRFs were included. Two investigators extracted data and performed a quality assessment. The heterogeneity between studies was assessed with I-squared and Cochran's Q tests. Odds ratio (OR) was used as an effect size to pool the association of NWO with CMRFs.& nbsp;Results:& nbsp;Twenty-five articles that met the inclusion criteria entered the study. The total number of participants was 177,792, with an age range of 13 to 75 years. Most studies were conducted on the general population (adults) and were from China. The result of fixed-effect model meta-analysis indicated an increased odds of hyperglycemia (OR:1.50, 95%:1.23, 1.76), high TG (OR:1.90, 95% CH:1.44, 2.35), low HDL (OR: 1.28, 95% CI:1.06, 1.49) and diabetes (OR:1.39, 95% CI:1.30, 1.49). Moreover, the random effect meta-analysis showed that NWO increased the odds of dyslipidemia (OR:1.83, 95% CI:1.61, 20.4), HTN (OR:1.40, 95% CI:1.28, 1.51) and metabolic syndrome (OR:1.92, 95% CI:1.58, 2.26). Moreover, the mean of all CMRFs except plasma glucose in NWO subjects was statistically higher than NWNO subjects (p-value < 0.05).& nbsp;Conclusion:& nbsp;The present study showed that NWO increased the odds of CMRFs. These findings indicate the inadequacy of the BMI measurement and the need for body fat assessment for a better obesity risk assessment

Full empirical path model between health anxiety, COVID-19 phobia, and social relationsaccording to T-value.

(T-value>1.96 is considered as significant). AGE: Age, PN: Partner number, CN: Child number, HA: Health anxiety, HIVY = HIV duration (year), SES: Socioeconomic status; EDU: Education, SR: Social relations; CPH: COVID-19 phobia.</p

Data_Sheet_1_How did lockdown and social distancing policies change the eating habits of diabetic patients during the COVID-19 pandemic? A systematic review.docx

BackgroundAfter the declaration of the COVID-19 pandemic, governments established national lockdowns and social distancing as an effective plan to control this disease. As a result of the lockdown policies, diabetic patients` access to food products, medication, and routine follow-ups is disrupted, making it difficult for them to control their disease.MethodsInternational databases, including PubMed/Medline, Web of Science, and Scopus, were searched until April 2022. All observational studies included assessing the impact of lockdown and social distancing on eating habits (as primary outcome), and glycemic and anthropometric indices (as secondary outcomes) of diabetic patients during the COVID-19 pandemic. The Newcastle-Ottawa Quality Scale was used to assess the quality rating of the studies.ResultsOverall, 22 studies were included in this systematic review, the results of which varied in different communities. In most studies, consumption of grains, fruits, and vegetables was reported to increase. On the other hand, consumption of snacks and sweets was reported to increase in other surveys. During the COVID-19 lockdown, most diabetic patients preferred to cook meals at home, using less takeout, fast foods, and alcoholic drinks. Although the patients mostly improved their eating habits, the glycemic and anthropometric indices were contradictory in different studies. Studies showed that the eating habits of diabetic patients vary from country to country, even in some cases and studies done in the same country showed different results. For example, all the studies done in Japan showed an increase in the consumption of snacks and sweets, leading to weight gain in the patients. However, conflicting results in eating habits have been observed in studies conducted in India.ConclusionThe lockdown policies have led to a beneficial change in the eating habits of diabetic patients to consume more fruits and vegetables and reduce the consumption of animal protein products and alcoholic beverages. While some diabetic patients have increased consumption of snacks and sweets, leading to a disturbance in their glycemic and anthropometric indices control. Understanding the consequences of lockdown and social distancing of the diabetic patient during the COVID-19 pandemic can help public health authorities make better recommendations to improve glycemic control.</p