Desk Lamp Research Articles

Enhancing Electron/Ion Transport in SnO2 Quantum Dots Decorated Polyaniline/Graphene Hybrid Fibers for Wearable Supercapacitors with High Energy Density.

Fiber-based supercapacitors are the potential power sources in the field of wearable electronics and energy storage textiles due to their unique advantages of electrochemical properties and mechanical flexibility, but achieving high energy density and practical energy supply still presents some challenges. In this study, we reported an approach of microfluidic assisted wet-spinning to fabricate SnO2 quantum dots encapsulated polyaniline/graphene hybrid fibers (SnO2 QDs@PGF) by incorporating uniformly polyaniline into graphene fibers and covalently bridging SnO2 quantum dots. The assembled SnO2 QDs@PGF fiber-typed flexible supercapacitors exhibit an ultralarge specific areal capacitance of 925 mF cm-2 in PVA/H2SO4, superior rate capabilities, and capacitance retention of 88% after 8000 cycles, indicating that the SnO2 QDs@PGF possess near-ideal capacitance properties, efficient ion transfer rate, and good cycling stability. In the EMITFSI/PVDF-HFP electrolyte system, SnO2 QDs@PGF realize a wide operating potential window of 2.5 V, a specific areal capacitance of 678.4 mF cm-2, and an energy density of 147.2 μWh cm-2 at 500 μW cm-2, which can be utilized to power an alarm clock, an electronic timer, and a desk lamp with a requirement of a 3 V battery. The exceptional performance of the SnO2 QDs@PGF can be attributed to the molecular-level homogeneous composite of granular polyaniline and graphene nanosheets and the interfacial C-O-Sn covalent coupling strategy employed between SnO2 QDs and PGF. These avenues not only effectively prevent the undesirable restacking of graphene nanosheets but also increase the interlayer electroactive sites, ordered ion diffusion channels, and strong interfacial charge transfer.

Evaluating User Experience Satisfaction of LED Desk Lamp using FAHP-FCE Approach

Technology development has effectively guided the design and development of light-emitting diode (LED) desk lamps, and the design and development of desk lamps are closely related to users. However, studies on user satisfaction when using desk lamps are still under explored. To this end, this paper proposes a satisfaction evaluation method that combines the fuzzy analytic hierarchy process (FAHP) and fuzzy comprehensive evaluation (FCE). This research results could provide an effective theoretical and practical reference for the experience design of LED desk lamps to improve and meet users' needs, thereby potentially improving the design of LED desk lamps for better customer satisfaction.

THE DESIGN OF AN EYE-PROTECTION DESK LAMP BASED ON STM32

In this paper, we design an intelligent eye-protection desk lamp based on the STM32 chip. The lamp uses a human body infrared sensor to detect the presence of a person near the lamp. It employs ultrasonic waves and a photoresistor to calculate the distance between the person and the lamp, and to gather information about the surrounding light. A voice module is used to broadcast prompt messages. This design enables the lamp to automatically switch on and off, correct the users sitting posture, adjust its brightness automatically, and provide rest prompts.

Design of 360° Dead-Angle-Free Smart Desk Lamp based on Visual Tracking

Objectives: This study aims to design a dead-angle-free smart desk lamp. Methods: The convolutional neural network (CNN) algorithm was used to realize the identification and positioning of objects. Then, the desk lamp arm was driven according to positioning to realize dead-angle-free illumination. In the subsequent testing, the designed desk lamp was compared with others driven by the support vector machine (SVM) and back-propagation neural network (BPNN) algorithms. Findings: The CNN algorithm implemented in the smart desk lamp demonstrated superior target recognition performance and positioning accuracy when compared to the other two algorithms. Moreover, with this algorithm, the smart desk lamp efficiently generated tracking responses for targets and displayed minimal positioning errors once tracking became stable. Novelty:The novelty of this article lies in the utilization of the CNN algorithm to achieve visual tracking for a smart desk lamp, which serves as the basis for its automatic adjustment. Doi: 10.28991/HIJ-2023-04-04-05 Full Text: PDF

BER analysis of a full-duplex relay-assisted BPSK-SIM based VLC system for indoor applications.

This paper contemplates a relay-assisted visible light communication (VLC) system, where the light source (table lamp) acts as a relay node and cooperates with the main light source. Following the IEEE 802.15.7r1 VLC reference channel model, we assume that there are two different light sources present in an office room. The first one is the source terminal present on the ceiling and another one is the desk lamp that serves as the relay station, which works in a full-duplex method. Because of the loop interference channel, we model the VLC relay terminal using ray tracing simulations. We have analyzed the bit error rate (BER) performance of the relay-assisted VLC system using a binary phase shift keying-subcarrier intensity modulation (BPSK-SIM) technique. The proposed method outperforms existing phase shift keying (PSK) and square M-quadrature amplitude modulation (M-QAM) techniques. The proposed VLC system using the BPSK-SIM technique achieves a BER performance of 10-12 for an SNR of 20dB. The results of the proposed full-duplex and half-duplex relayed VLC systems are evaluated using equal power allocation (EPA) and optimum power allocation (OPA) techniques over three different modulation schemes, which are 2-PSK, square M-QAM, and BPSK-SIM.

User Experience Enhancement Strategy of LED Desk Lamp Using IPA Model

LED desk lamps are widely used in modern life as one of the lighting products. However, only a few studies focus on the user experience (UX) of LED desk lamps. Therefore, this study adopts the importance-performance analysis (IPA) model, with the aim of exploring strategies to enhance the UX of LED desk lamps. We evaluated the key factors of UX based on the importance and actual performance of LED desk lamps for users. By analyzing the results, we proposed strategies to improve LED desk lamps, thereby potentially improving the consumer experience and market competitiveness of LED desk lamps.

Intelligent Table Lamp Based on Single Chip Microcomputer

At present, modern smart home is increasingly favored by people, and the functions of intelligent desk lamps become diversified with the demand updating. In the process of using desk lamps, poor sitting posture or overuse of eyes may cause vision loss and physical pain. Therefore, it is of great theoretical significance and practical value to actively explore and develop an intelligent desk lamp with low cost and functions of automatic dimming, sitting posture correction, reminder of rest, energy conservation and environmental protection. In the intelligent desk lamp designed in this paper, STC89C51 microcontroller is used as the core controller, BH1750 light sensor module is used to detect the current ambient light intensity, and the pulse width modulation (PWM) technology is used to control the brightness of the desk lamp for TB6612 motor drive. The infrared probe module is used for personnel detection. When the infrared probe module detects that someone is approaching, the desk lamp will be automatically turned on through the relay module. When no one is detected, the microcontroller controls the relay to automatically turn off the desk lamp and power off. The intelligent desk lamp is very convenient to use. It can not only save electric energy effectively, but also solve the problem of touching the lamp in the dark and the potential safety hazard for people by automatically switching on and off the lamp. It has good application value and market prospects.

Research on Improvement of The Design of DP Lamp Based on KANO-QFD

The number of contemporary college students is not only huge, but also showing a rapid growth trend. Then the research on the desk lamp used in the daily life of College Students' dormitory can effectively provide the basis for the good university life of students. With the development of the economy, the improvement of the quality of life, and the arrangement of the work and rest time of the contemporary college students affect the experience of the college students' user groups on the dormitory lamp. Based on the principles of KANO and QFD, combined with the characteristics of university students' dormitory lamp, In the process of completing the project,we use KANO principle firstly and then combine QFD principle.In the KANO stage, we need to calculate the comprehensive score of the importance of College Students' needs. In the QFD stage, the importance of design requirements is calculated, and the key design requirements are output at last, so as to carry out the lamp design planning, effectively transfer the diverse needs of college students, maximize the user satisfaction of college students, and provide effective method guidance for lamp designers.

Effects of behaviors and surrounding environment on myopia before and during the COVID-19 pandemic: a longitudinal analysis of children and adolescents in China.

To investigate the relationship between related factors and visual acuity of Chinese school students before and during the COVID-19 pandemic. Chinese students from primary and secondary schools were included from the Chinese National Surveys on Students' Constitution and Health CNSSCH (2019). A total of 1496 participants completed follow-ups in June and December 2020, respectively. Generalized estimating equations were used to test the differences in visual environment. Logistic regression models were utilized to examine the roles of behaviors and surrounding environment changes associated with myopia before and during the pandemic. The prevalence of myopia was 47.7%, 55.6%, and 57.2% in baseline and two follow-ups, respectively. Significant differences existed for gender, learning level, and region (all P < 0.05). The proportion of new myopia and myopia torsion was the highest in the primary schools. Multivariate logistic regression analysis found that screen time ≥ 4h/d (OR = 2.717), poor eye habits (OR = 1.477), insufficient lighting for studying at night (OR = 1.779), desk or roof lamps only (OR = 1.388), and poor sleep quality (OR = 4.512) were the risk factors for myopia (all P < 0.05), and eye exercises (OR = 0.417), milk intake (OR = 0.758), and eggs intake (OR = 0.735) were the protective factors for myopia (all P < 0.05). Prevalence of myopia increased among Chinese students before and during the COVID-19. It is necessary to pay more attention to the pupils' visual acuity, especially in primary school students, in the future. The online version contains supplementary material available at 10.1007/s10389-023-01900-w.

Design and implementation of a multi-functional desk lamp with intelligent posture correction based on MCU

With the improvement of people's living standards, more and more people have become accustomed to sitting in front of computers for long periods of time for work or study, which can lead to poor sitting posture habits. This paper aims to design an intelligent desk lamp that combines Bluetooth technology with remote communication technology to improve people's quality of life by correcting sitting posture and providing comfortable lighting experiences. The design uses the STC89C52 as the main control chip, and combines infrared sensing, photoresistor, and Bluetooth HC05 remote communication to detect and control parameters such as human sitting posture and ambient light. Experimental results show that the intelligent desk lamp designed in this paper has excellent lighting effects and can adjust brightness adaptively. In terms of sitting posture correction, the desk lamp can accurately detect human sitting posture and remind users to adjust their posture in a timely manner. In addition, the Bluetooth HC05 remote communication module enables communication with mobile phones and other devices, and facilitates remote control through sending specific AT commands or defining specific communication protocols. The intelligent desk lamp designed in this paper not only improves the comfort and productivity of office environments, but also provides a useful application of smart home technology in daily life. In the future, with the increasing demand for smart home technology, the market prospects of intelligent desk lamps, especially those with remote communication functions, will become even broader.

An Enhanced Model Using the Kano Model, QFDE, and TRIZ with a Component-Based Approach for Sustainable and Innovative Product Design

In order to increase their competitiveness, companies need to have five important capabilities in the product development process, namely, the ability to identify important customer and environmental requirements, convert them into technical requirements, create innovative designs, and determine the best improvement alternatives. Based on a literature survey, previous studies are still inadequate in incorporating these five important capabilities simultaneously and effectively. This study proposes an enhanced model using the Kano model, Quality Function Deployment for Environment (QFDE), and the theory of inventive problem solving (TRIZ), with a component-based approach for systematically designing sustainable and innovative products. An example of a desk lamp design improvement is used to demonstrate the proposed model. After identifying customer and environmental requirements, they are specifically characterized and transformed into a detailed design target using a combination of the Kano model and the improved QFDE method. A thorough evaluation method is developed to determine the most prominent TRIZ solutions. This enhanced model is accomplished at the component level. The results show that the proposed model is capable of incorporating the five important capabilities while reducing process complexity, which greatly assists designers in generating sustainable and innovative designs with minimal dependence on designers’ subjectivity.

An easy-to-apply method for determining permissible exposure limit of retina to light

Long exposure to intensive artificial light imposes threats to the retina. It is crucial to know the permissible exposure time to prevent photoretinitis. One complicated quantification method is available, which, however, also requires instrumentally measured spectrum and illuminance. We present herein an easy-to-apply formula and a ready-to-use table derived therefrom to determine the permissible exposure limit for any given desk lamp at any viewing distance. One only needs to acquire its color temperature and luminous flux labeled on the product. The method can be used to assist the general public in quickly assessing the potential hazardous status of their desk lamps, if any, and guide the field experts in designing human-eye-friendly lighting.

Ultra-low Ultraviolet Radiation in Office Lighting Can Moderate Seasonal Vitamin D Cycle: A Pilot Study.

Ultraviolet-B (UV-B) radiation initiates vitamin D synthesis in the skin, making sun exposure a major source of vitamin D. We aimed to determine whether office lighting containing ultra-low levels of UV-B radiation could modify the winter decline in vitamin D status in the UK, while being safe and well tolerated. Twenty commercial office desk lamps were modified with the addition of UV-B LEDs. Ten hospital office administrative staff received UV-modified lamps with UV-on, and 10 staff received identical placebo lamps with UV switched off, in a double-blind, cross-over pilot study during the winter of 2021/22. Circulating 25-hydroxyvitamin D [25(OH)D] was measured every 4 weeks for 20 weeks: at baseline and during an 8-week trial period, 4-week washout, and a cross-over 8-week trial period. The linear regression combining the complete datasets for phase 1 and 2 of the trial showed that an 8-week UV light intervention significantly increased 25OHD by 7.13 nmol/l with a p-Value=0.02, compared to the placebo group. Similar results were confirmed by cross-over analyses using the datasets of those completing both phases of the trial both with and without using the inverse probability weighing method to handle dropouts. The UV-B-modified lighting was well-tolerated and safe with weekly doses of UV-B of 0.5 - 0.9 Standard Erythema Dose [SED=100 Jm-2 erythema weighted UV radiation] measured at chest level. This ultra-low dosing was effective in reducing the winter decline in vitamin D status.

Radiation evaluation of household appliances and stone materials from residences in Hangzhou

The electromagnetic radiation of household appliances and radioactivity of stone materials from residences were determined using integrated magnetometer and γ-ray spectrometer techniques. The radiation levels of desktop computers were greater than that of notebook computers, while microwave ovens and induction cookers produced low-frequency electromagnetic fields during the operation. The safety distances for hair drier, desk lamp, and patch board were ca. 50 cm, whereas those of the rest appliances were ca. 30 cm. Radioactive tests of stones collected from certain regions were conducted. The specific activities of 226Ra, 232Th, and 40K were used to calculate internal exposure indexes (I Ra) and external exposure indexes (I γ). Moreover, both the I Ra and I γ for wall coatings were putty < tile adhesive, thereby the I Ra and I γ for bathroom furniture were ceramic facet < pottery basin < flush toilet. Natural radionuclides widely exist in interior decorations, indicating that humans in open radioactive environments receive background radiation all the time.

Hidden Green by Miklós Erdély

Hidden Green by Miklós Erdély

The Manufacturing of Tri-Chromatic White LED for LED Desk Lamp

The pollution of the environment and demand for energy are more and more serious because of the speedy development in scientific technology. The new scientific technology of economizing energy and environmental protection is everyone's striving goal. Solid-state lighting source, such as white-light LED, is a light source component which accords with this goal. White light can be produced by mixing differently colored light, the most common method is to use red, green and blue (RGB). Hence the method is called multi-colored white LEDs (sometimes referred to as RGB LEDs). This paper uses tri-chromatic white LED of RGB system to produce LED desk lamp. This paper also investigates different kinds RGB LED quantity and arrangement to find the optimal combination of white-light LED. Finally, we do not only use constant-voltage IC circuits to provide the LED brightness consistency and achieve approximate the white-light consistency, bust also employ the experiments to validate the characteristics of the lamp developed in this paper. Keywords: White LED, light emitting diode, LED desk lamp tri-chromatic.

Planar Omnidirectional Wireless Power Transfer System Based on Novel Metasurface

In this article, we propose a novel metasurface-basedmagnetic coupling resonant wireless power transfer (MCR-WPT) system to realize planar omnidirectional WPT at a mid-range distance. The resonator devices—dielectric-constant disks or planar helixes—are located on both sides of the metasurface, which comprises conducting wires placed in a planar sunburst pattern. Transmission efficiency of >40% is achieved on a circular plane with a diameter of ∼40 cm. In addition, the transfer efficiency is insensitive to the placement of a human hand near the proposed MCR-WPT system. The maximum permissible input powers for the coil and dielectric resonator versions of the proposed MCR-WPT system are 0.83 and 2.56 W, respectively, in compliance with the limit prescribed in the International Commission of Non-Ionizing Radiation Protection guidelines. The proposed design may help realize many potential WPT applications, especially for the desktop wireless charging of household devices, such as mobile phones, tablets, and LED desk lamps.

Sensitivity to orientation is not unique to social attention cueing

It is well-established that faces and bodies cue observers’ visuospatial attention; for example, target items are found faster when their location is cued by the directionality of a task-irrelevant face or body. Previous results suggest that these cueing effects are greatly reduced when the orientation of the task-irrelevant stimulus is inverted. It remains unclear, however, whether sensitivity to orientation is a unique hallmark of “social” attention cueing or a more general phenomenon. In the present study, we sought to determine whether the cueing effects produced by common objects (power drills, desk lamps, desk fans, cameras, bicycles, and cars) are also attenuated by inversion. When cueing stimuli were shown upright, all six object classes produced highly significant cueing effects. When shown upside-down, however, the results were mixed. Some of the cueing effects (e.g., those induced by bicycles and cameras) behaved liked faces and bodies: they were greatly reduced by orientation inversion. However, other cueing effects (e.g., those induced by cars and power drills) were insensitive to orientation: upright and inverted exemplars produced significant cueing effects of comparable strength. We speculate that (i) cueing effects depend on the rapid identification of stimulus directionality, and (ii) some cueing effects are sensitive to orientation because upright exemplars of those categories afford faster processing of directionality, than inverted exemplars. Contrary to the view that attenuation-by-inversion is a unique hallmark of social attention, our findings indicate that some non-social cueing effects also exhibit sensitivity to orientation.

Self-powered sensors driven by Maxwell's displacement current wirelessly provided by TENG

Electrodeless triboelectric nanogenerator (EL-TENG) is a kind of novel TENG that has no metal electrodes and the power is transmitted via Maxwell's displacement current. For a rotation EL-TENG, the power is collected by an induction coil at a vertical distance of 20 cm. A self-powered sensor is demonstrated based on Maxwell's displacement current supplied wirelessly by EL-TENG. Such a design can use one EL-TENG to drive multiple wireless senses for the purposes such as control switches for desk lamps and alarm system. This kind of wireless and self-powered sensor has broad applications in the fields of Internet of Things, big data and artificial intelligence.

Simulation and experimental research of digital manufacturing based on reverse engineering

Reverse innovative design has long been an important subject in the engineering field. In this paper, two different-curved desk lamp stands were studied. The point cloud data of the stands was collected by using Win3D scanner and Geomagic Wrap software. Then, after facial processing of the data, reverse innovation of the facial data was performed through the reverse design software of Geomagic Design X to develop a new desk lamp stand that can satisfy engineering applications. It is actually an upgrading of the appearance of the original desk lamp stand. Finally, the numerical control program of the new desk lamp stand was completed through the processing module of UG software, and the program was verified by simulation and was used for experimental sample machining. Experimental results showed that the difference between the processed sample and the research model was less than 0.02 mm, indicating that the new design can satisfy engineering requirements and replace the original desk lamp stand. This means that reverse design technology is highly compatible with machining technology, which can shorten the innovative design period of product.