Smart watch antenna design is challenging due to the limited available area and the contact with the human body. The strap of smart watch can be utilized effectively for integration of the antenna. In this study, an antenna integrated on a smart watch strap model using computer simulation technology (CST) was designed. The antenna was designed for industrial, scientific, and medical (ISM) frequency bands at 2.45 and 5.8 GHz. Roger 3003C was used as substrate due to its semi-flexible nature. The antenna size is 28.81 × 19.22 × 1.58 mm³ and it has a gain of 1.03 and 5.97 dB, and efficiency of 80% and 95%, at 2.45 and 5.8 GHz, on the smart watch strap, respectively. A unit cell was designed having a dimension of 19.19 × 19.19 × 1.58 mm³ to mitigate the effect of back radiation and to enhance the gain. The antenna backed by the unit cell exhibited a gain of 2.44 and 6.17 dB with efficiency of 50% and 72% at 2.45 and 5.8 GHz, respectively. The AMC-backed antenna was integrated into a smart watch strap and placed on a human tissue model to study its human proximity effects. The specific absorption rate (SAR) values were calculated to be 0.19 and 1.18 W/kg at the designed ISM frequencies, and are well below the permissible limit set by the FCC and ICINPR. Because the antenna uses flexible material for wearable applications, bending analysis was also undertaken. The indicated results prove that bending along the x- and y-axes has a negligible effect on the antenna’s performance and the antenna showed excellent performance in the human proximity test. The measured results of the fabricated antenna were comparable with the simulated results. Thus, the designed antenna is compact, has high gain, and can be used effectively for wireless IoT applications.

Graphene-based optical sensing devices have been widely studied for their broad band absorption, high carrier mobility, and mechanical flexibility. Due to graphene’s weak light absorption, studies on graphene-based optical sensing thus far have focused on hybrid heterostructure devices to enhance photo-absorption. Such hybrid devices need a complicated integration process and lead to deteriorating carrier mobility as a result of heterogeneous interfaces. Rippled or wrinkled graphene has been studied in electronic and optoelectronic devices. However, concrete demonstrations of the impact of the morphology of nanofilms (e.g., graphite and graphene) associated with light absorption in optical sensing devices have not been fully examined. This study explored the optical sensing potential of a graphite nanofilm surface with ripples induced by a stretchable polydimethylsiloxane (PDMS) supporting layer under different stretch:release ratios and then transferred onto silicon, both under experimental conditions and via simulation. The optical sensing potential of the rippled graphite nanofilm was significantly enhanced (260 mA/W at the stretch–release state of 30%), as compared to the pristine graphite/PDMS (20 mA/W at the stretch–release state of 0%) under laser illumination at a wavelength of 532 nm. In addition, the results of our simulated computation also confirmed the improved light absorption of rippled graphite nanofilm surface-based optical sensing devices, which was comparable with the results found in the experiment.

Graphene-based photodetection (PD) devices have been broadly studied for their broadband absorption, high carrier mobility, and mechanical flexibility. Owing to graphene’s low optical absorption, the research on graphene-based PD devices so far has relied on hybrid heterostructure devices to enhance photo-absorption. Designing a new generation of PD devices supported by silicon (Si) film is considered as an innovative technique for PD devices; Si film-based devices are typically utilized in optical communication and image sensing owing to the remarkable features of Si, e.g., high absorption, high carrier mobility, outstanding CMOS integration. Here, we integrate (i) Si film via a splitting/printing transfer with (ii) graphite film grown by a pyrolysis method. Consequently, p-type Si film/graphite film/n-type Si-stacked PD devices exhibited a broadband detection of 0.4–4 μm (in computation) and obtained good experimental results such as the responsivity of 100 mA/W, specific detectivity of 3.44 × 10⁶ Jones, noise-equivalent power of 14.53 × 10⁻¹⁰ W/(Hz)^1/2, external quantum efficiency of 0.2, and rise/fall time of 38 μs/1 μs under 532 nm laser illumination. Additionally, our computational results also confirmed an enhanced light absorption of the above stacked 2D heterostructure film-based PD device compatible with the experimental results.

Traditional electron-multiplying charge-coupled devices suffer from slow readout and large power consumption because of the complex driving circuitry implemented for the square clocking to serially transfer the charge during the readout process. At the same time, the photo-generated carriers are also prone to pre-amplification losses. Owing to the electrostatic capacitive coupling of the tunable graphene channel with the silicon photogate, an in-situ transient photoresponse study of the single graphene-oxide-silicon heterostructure driven into pre-avalanche condition by a fast sinusoidal gating signal is presented. This technique paves the way for futuristic sinusoidally driven, graphene-based, out-of-plane electron-multiplication charge-coupled devices with specific low-power surveillance and adaptive optics applications. The operating scheme of the device demonstrates the excellent capability for sensing short and small bursts of photons (25 nW). The maximum multiplication factor of ~8.5 and responsivity of 350 A/W are achieved. The operating equipment limitations and their respective solutions are also discussed.

This paper empirically finds the link between the banking sector performance and political stability on Economic growth. Panel data was used encompassing the time frame from 2006 to 2016 for banks operating in Pakistan. This paper main purpose at discovering that the banking sector performance, political stability, and other bank-specific factors have a vital impact on enhancing the procedure of economic growth in Pakistan. “Predictable outcomes suggest that economic growth in Pakistan is in long-term stability relationship; banking sector and political stability have long-term significant impact on economic growth and subsequently, economic growth converge to their longterm stability levels by the means created by Investment. This supports the reality that political certainty or stability is capable of stimulating a country’s development process”. Therefore, revealed significant relationship between banking sector performance and political stability of Pakistan on economic growth.

The aim of this research study is to find the association between political events in Pakistan and Pakistans stock exchange. The study considered 10 most big political events in Pakistan in the duration of 2012 to 2017. To calculate the results, the study used moving average method for calculating expected and abnormal returns. Further, t-statistics is used to explore the relationship between political events and behavior of PSX (100). The study has explored in results that political events, on which investor believes some change in Government policies do have impact on PSX. Investors respond positively when government organizations look strong and free from political pressure. The study recommended that government should make strong their organization, rather than alter government policies frequently.