Lock Device Research Articles

Development of a Lock Biometric Authentication System for a Battery Powered Locking Device

This paper describes the development of a biometric authentication system in a battery-powered locking device. It differs from the conventional locking system, which connected to an external power supply. The system focuses on a fingerprint-based identification with single button operation. A fingerprint sensor readily available in the market was integrated with an Arduino as the processing unit to unify the button operation as means to trigger functions on the fingerprint sensor and actuator motors, as well as indicating lights for user feedback. The aim of the seamless fingerprint authentication requires a brief matching of users’ fingerprints. A prototype of the system was built and tested. It was found that the device is able to match a fingerprint in less than 1s for up to 50 registered fingerprints. Using a nominal battery capacity of the 12V lithium battery pack with 5000mAh, the amount of current supply to the actuator is sufficient for 400 activations.

Development and Application of Several New Technologies in Safety Locking Device of the Substation Screen Cabinet

Anti-misoperation locking device is a locking device for control operation circuit and primary equipment. At present, three faults of relay protection often occurs in the secondary cabinet of substation. There will be a lot of safety threats if the secondary cabinet is lack of locking device. Therefore, in this study effective improvement strategies will be put forward in the aspect of technology and further analyze the technology of the secondary cabinet safety measures locking device and then replace the traditional setting mode of the secondary safety measures so that to technically prevent the violation of regulations in secondary maintenance and effectively prevent the occurrence of three fault events of relay protection. This technology can be applied to the secondary work site of power industry which is significant to ensure the safe operation of power grid. This study illustrates the application effect of the technology of the safety measures locking device for secondary panel cabinet in substation with specific cases which could provide help for the the relevant staff.

Design and Analysis of Pneumatic Rotary Locking Device of Forage Package Bale Openers

Design and Analysis of Pneumatic Rotary Locking Device of Forage Package Bale Openers

Investigation of the Processes of Formation of Cavitation Bubbles in a New Axial Control Valve Design Featuring a Rotary Locking Device

The article presents a mathematical description of the formation process of cavitation bubbles in a new design of axial control valve fitted with a rotary locking device. The differential distribution function of the number of cavitation bubbles by size is obtained for use in calculating the main valve parameters.

Biomechanical Evaluation of a Novel Loop Retention Mechanism for Cortical Graft Fixation in ACL Reconstruction.

Background:Implant fixation by means of a cortical fixation device (CFD) has become a routine procedure in anterior cruciate ligament reconstruction. There is no clear consensus whether adjustable-length CFDs are more susceptible to loop lengthening when compared with pretied fixed-length CFDs.Purpose:To assess biomechanical performance measures of 3 types of CFDs when subjected to various loading protocols.Study Design:Controlled laboratory study.Methods:Three types of CFDs underwent biomechanical testing: 1 fixed length and 2 adjustable length. One of the adjustable-length devices is based on the so-called finger trap mechanism, and the other is based on a modified sling lock mechanism. A device-only test of 5000 cycles (n = 8 per group) and a tendon-device test of 1000 cycles (n = 8 per group) with lower and upper force limits of 50 and 250 N, respectively, were applied, followed by ramp-to-failure testing. Adjustable-length devices then underwent further cyclic testing with complete loop unloading (n = 5 per group) at each cycle, as well as fatigue testing (n = 3 per group) over a total of 1 million cycles. Derived mechanical parameters were compared among the devices for statistical significance using Kruskal-Wallis analysis of variance followed by post hoc Mann-Whitney U testing with Bonferroni correction.Results:All CFDs showed elongation <2 mm after 5000 cycles when tested in an isolated manner and withstood ultimate tensile forces in excess of estimated peak in vivo forces. In both device-only and tendon-device tests, differences in cyclic performance were found among the devices, favoring adjustable-length fixation devices over the fixed-length device. Completely unloading the suspension loops, however, led to excessive loop lengthening of the finger trap device, whereas the modified sling lock device remained stable throughout the test. The fixed-length device displayed superior ultimate strength over both adjustable-length devices. Both adjustable-length devices showed adequate fatigue behavior during high-cyclic testing.Conclusion:All tested devices successfully prevented critical construct elongation when tested with constant tension and withstood ultimate loads in excess of estimated in vivo forces during the rehabilitation phase. The finger trap device gradually lengthened excessively when completely unloaded during cyclic testing.Clinical Relevance:Critical loop lengthening may occur if adjustable-length devices based on the finger trap mechanism are repeatedly unloaded in situ.

Development of a Lock Device for a Mechanical Arm Support Suit

Development of a Lock Device for a Mechanical Arm Support Suit

Biomechanical Comparison of First Tarsometatarsal Arthrodesis Constructs Over Prolonged Cyclic Testing.

Background:Traditionally, a lengthy period of nonweightbearing is required following arthrodesis of the first tarsometatarsal (TMT) joint in order to provide a stable healing environment for the bones. The goal of this research was to determine the resistance to plantar gapping of 2 locked intramedullary devices and a medial plate with crossing screw, all specifically designed for hallux valgus correction, and compare them to traditional 2–crossing screw fixation under a cyclic testing protocol. We hypothesized the locked intramedullary devices and the medial plate with crossing screw would better resist plantar gapping.Methods:Forty cadaver specimens received 1 of 4 operative treatments: a locked intramedullary device with 2 points of fixation in the cuneiform, a locked intramedullary device with 1 point of fixation in the cuneiform, a medial plate with crossing screw, or 2 crossing screws. We applied dorsiflexion bending forces to the first TMT joint using a cadaveric fatigue model for 20 000 cycles. The plantar gap between the metatarsal and cuneiform was measured at the beginning and end of cyclic testing. Thirty-six specimens were included in the final data set.Results:Both locked intramedullary device groups and the medial plate with crossing screw group exhibited significantly less gap widening compared to the 2–crossing screw group (vs 3-hole intramedullary device, P = .014; vs 4-hole intramedullary device, P = .010; and vs medial plate with crossing screw, P = .044). The intramedullary device groups were the most stable during the cyclic fatigue test, exhibiting the smallest gap widening. The medial plate with crossing screw fixation was also more stable than crossing screws in the cyclic fatigue model.Conclusions:The locked intramedullary devices and medial plate with crossing screw resisted plantar gapping better than 2 crossing screws when used for first TMT arthrodesis.Clinical Relevance:These results indicate that locked intramedullary devices and medial plates with crossing screws may promote superior bone healing and may better tolerate early weightbearing compared with 2 crossing screws.

Dynamic Modeling and Simulation of a Parallel Locking Mechanism

Aiming at the locking problem of the mechanism in face-to-face contact, a kind of parallel mechanical locking device is designed, which can make the locked surface self-locking even when the locking hydraulic system fails, thus ensuring the safety and reliability of the locked mechanism. Through theoretical analysis and dynamic simulation of ADAMS software, the self-locking function of the device is verified and the self-locking Angle is calculated. Meanwhile, considering that the locking device may act as a “resonator” and cause secondary excitation to the locked device, which affects the vibration characteristics of the locked system, the mode analysis of the locking device is done by using ABAQUS software, and the feasibility of the locking device for the locked mechanism excited by low frequency is proved.

Preferences for Firearm Locking Devices and Device Features Among Participants in a Firearm Safety Event.

IntroductionSafe firearm storage is associated with a lower risk of firearm-related injury and death. Although providing firearm locking devices is a key component of firearm safety interventions, little is known about the types and characteristics of devices preferred by firearm users or others who make decisions about firearm storage. The aim of this study was to describe preferences for firearm locking devices and device features among firearm safety event participants.MethodsWe conducted a cross-sectional survey in the State of Washington in 2016 that assessed participants’ preferences for five firearm locking devices (eg, trigger lock) and seven device features (eg, quick access). We categorized respondents (n=401) as adults in households with 1) all firearms locked, 2) at least one unlocked firearm, and 3) no firearms. We analyzed data in 2017.ResultsDevice ownership and feature preferences varied substantially but were similar across the three household categories. Of those residing with unlocked firearms, 84% reported they would consider using or definitely use a lock box, whereas 11% reported they would never use a trigger lock. Additionally, of those residing with unlocked firearms, 80% and 89% reported that the ability to lock a firearm while loaded and unlock it quickly were, respectively, “very important” or “absolutely essential.”ConclusionParticipants had differing preferences for firearm locking devices and device features, although preferences were largely similar across households with locked, unlocked, or no firearms. At least eight in ten participants reported “great importance” regarding the ability to lock a firearm while loaded and unlock it quickly, which is likely related to perceptions about the utility of safely stored firearms for household protection. Designing firearm safety interventions to match the needs and preferences of those who make firearm storage decisions may improve their effectiveness.

A smart FRET probe exhibiting a molecular keypad lock device based on rapid detection of nitric oxide mediated by Cu2+ ion

A rhodamine-dansyl conjugate (RPD) has been synthesized for rapid FRET-based ratiometric detection of nitric oxide (NO) up to nM level mediated by the Cu2+ ions. The emission band of dansyl centered at 481 nm showed quenching upon addition of Cu2+ and further addition of NO, showed a decrease at dansyl emission band and ratiometrically generate a new band at 580 nm corresponding to the open spirolactam derivative of rhodamine. Subsequent chemical inputs of Cu2+ and NO generate a smart molecular level security device with a unique set of inputs to unlock the device. The rapid detection of NO is devoid of false signalling, as the detection is dependent on sequence-based two input correct combination. The [RPD-Cu2+] solution was also highly efficient to detect NO in solution by a visual change in colour: i.e. colourless to pink and pale green to orange under naked eye and UV-light respectively. The probe-Cu2+ solution exhibits excellent NO imaging in HeLa cells with low cytotoxicity and the lower level of emission in the presence of probe-Cu2+ which is advantageous to see the initial incubation of probe inside the live cells. The applicability of [RPD+Cu2+] has been proven by efficient detection of NO in HeLa cells by dual enhanced emissions in green/red channels.

Assessing the crashworthiness of a vehicle seat for rear and frontal impacts

Abstract A vehicle seat represents an automotive passive system because it limits the damage caused to passengers in the events of an accident or a crash. This way, the present work intends to evaluate the safety of an anchorage mechanism of a frontal vehicle driver seat considering two hazardous situations rear and frontal impacts. Performing a nonlinear FE in static and transient analyses provide the stress distribution in the main components of the mechanism, such as the inner track, the lock device and the bolts using Ansys®. Regulation No 17 from Un/ECE regulates the acceleration levels predicted in a crash test and therefore applied in the simulation. In addition, departing from a crash of 5g a fatigue analysis is carried out. From this particular analysis, it becomes possible to evaluate the actual safety of the vehicle seat after a minor crash.

Loudness calculation procedure to study electronic steering column lock noise measurement

In the automotive field, the customer requirements for low interior noise and pleasant sound quality inside a vehicle are getting higher and higher. Various national and international regulatory authorities established and reviewed vehicle interior noise for the past years. Besides, lots of studies have shown that vehicle noise can influence the driver’s perceptions and also his or her driving capabilities. To succeed in this scenario, all manufacturers are investing in technology and research in order to improve their component performance. Working on the noise source so as to reduce the seriousness of these noise problems can be really effective. However, various engineering techniques are available to deal with noise and sound-measuring instruments, and systems can help to identify the nature of the problem and they can also be helpful in determining the right procedure to analyse the noise problem. This work proposes a procedure to evaluate the noise originated from an electronic steering column lock device which is used to lock and unlock the steering wheel according to European safety requirements. In particular, different standards and requirements for loudness evaluation have been discussed and the formulation of a straightforward procedure, which can be used to evaluate the loudness according to costumer’s requirements, is defined.

Loose-Lipped Mobile Device Intelligent Personal Assistants: A Discussion of Information Gleaned from Siri on Locked iOS Devices.

The forensic analysis of mobile handsets is becoming a more prominent factor in many criminal investigations. Despite such devices frequently storing relevant evidential content to support an investigation, accessing this information is becoming an increasingly difficult task due to enhanced effective security features. Where access to a device's resident data is not possible via traditional mobile forensic methods, in some cases it may still be possible to extract user information via queries made to an installed intelligent personal assistant. This article presents an evaluation of the information which is retrievable from Apple's Siri when interacted with on a locked iOS device running iOS 11.2.5 (the latest at the time of testing). The testing of verbal commands designed to elicit a response from Siri demonstrate the ability to recover call log, SMS, Contacts, Apple Maps, Calendar, and device information which may support any further investigation.

A study for prevent theft of the bike design and analysis

This research will deal with the analysis and design of an anti-theft bicycle. At the first, the structure of the bicycle lock device will be focused. Therefore, all related academic journals, dissertations, and patent were collected, ordered, classified, and analysis in order to understand the phase of the developing tendency towards the bicycle lock apparatus presently. Nowadays, a wave of riding bicycles all over the world is quite prevailing. Also, the bicycles incline to be high-price sporting and recreational equipment. Due to this, the rate of stolen bicycles has increased as well. Even though there are many different types of bicycle locks sold on the market, they are unable to work out effectively to prevent from being stolen because they are easy to be broken. In this case, the target design in this research will be mainly put on the simple structure and facile use enabling users feeling secure to park their bicycles. The design also includes a lock that works together with the bicycle frame to provide a new option of anti-theft design for bicycles. We defined the functional requirements by the process of an innovative mechanical design, before designing the fundamental bicycle structure of the present anti-theft bicycle and finally integrate all the requirements of design. The SolidWorks software was used to draw a 3D model of the anti-theft bicycle; the ANSYS software was also used to do CAE analysis, to understand the distribution of stress, so that the design and the requirements of use are met.

트랙터용 차동 잠금 장치의 설계 변수 영향에 관한 연구

트랙터용 차동 잠금 장치의 설계 변수 영향에 관한 연구

Rhodamine based chemosensor for trivalent cations: Synthesis, spectral properties, secondary complex as sensor for arsenate and molecular logic gates

A rhodamine based chemosensor, 2-(2-(5-bromo-2-hydroxybenzylideneamino)ethyl)-3’,6’-bis(diethylamino)spiro[isoindoline-1,9′-xanthen]-3-one (HL), has been explored for detection of trivalent cations, Al3+, Fe3+ and Cr3+. It has been synthesized by Schiff-base condensation and characterized by standard techniques including X-ray single crystal diffraction analysis. HL is colorless and non-fluorescent. In the presence of trivalent cations, colorless solution of HL turns pink. In UV–vis spectra, gradual addition of the cation produces gradual increment in absorption band at 528nm in HEPES buffer in methanol:water (7:3, v/v) (pH 7.2). No other monovalent and divalent cation except Cu2+ is able to cause color change. HL is almost non-fluorescent in HEPES buffer in methanol:water (7:3, v/v) (pH 7.2) when it is excited at 500nm. Emission intensity increases gradually at 552nm in the presence of increasing concentration of trivalent cations. Intensity increases by 98, 50 and 38 fold in the presence of one equivalent of Al3+, Cr3+ and Fe3+, respectively. No other metal ion can cause an enhancement in emission intensity of HL suggesting selectivity of the probe towards these trivalent cations. Quantum yield of HL complexes with M3+ increases significantly compared to that of free HL. Non-fluorescent HL is a closed ring compound whereas trivalent metal ions induce ring opening of spirolactam ring and complex formation enabling strong fluorescence. Limit of detection (LOD) values of HL have been determined to be 1.18, 1.80 and 4.04nM for Al3+, Cr3+ and Fe3+, respectively, suggesting very high sensitivity towards the cations. Job's plot analysis and mass spectral analysis shows 1:1 complex formation between HL and metal ion. AsO43− ion quenches emission intensity of HL–Al3+ complex as the anion snatches Al3+ from its complex thereby leading to the generation of non-fluorescent spirolactam unit. DFT and TD-DFT studies have been performed to investigate different optimized structures and various spectral transitions. Al3+ complex with HL acts as fluorescent sensor for arsenate ion as the anion snatches Al from Al-HL complex and it returns back to its ring closed spirolactam form. Advanced level molecular logic devices e.g. different 3 and 5 input advanced level logic gates, molecular keypad lock and memory device have been constructed using these properties and interpreted.

The Reliability of the Locking Devices of the Switches. Role of the Ballast Bed

The dimensioning of the locking device of a switch is made essentially as a function of the applied loads during the switch rails movement or considering a false route. The phenomena related to the vibrations induced by the track are therefore normally not taken into account. Such vibrations are particularly accentuated by the ballast bed deconsolidation in the sleeper panel supporting the locking device. Unfortunately, there is no specific technical reference in order to control these aspects, even though the most frequent cause of locking device components failures is relied to the vertical oscillations induced by the trains, rather than to the effort to commute the switch rails. In this study, the results of a field investigation carried out at two levels of ballast tamping are reported and discussed. It is found that the ballast compaction plays a fundamental role for the component to be prone to the early attainment of critical mechanical conditions. Procedures for the monitoring of the stability and efficiency of the ballast bed to ensure the required reliability of the locking device are also envisaged.

Effect observation of stat lock device applied in fixing implantable venous access port of butterfly wing without injury needle

Objective To observe the application effect of stat lock device on fixing butterfly needles. Methods A total of 124 patients with implantable venous access port and venous chemotherapy from our hospital were selected by cluster sampling during April 2015 to July 2015. According to the odd and even-numbered day grouping method, all patients were divided into control group(64 patients) and experimental group(60 patients). Patients in experimental group use stat lock and transparent dressing fixing butterfly needles, and patients in control group use sterile gauze and transparent dressing fixing butterfly needles, statistical cases of comfort changing and drop speed slower and repeated puncture of two groups were compared. Results The comfort of patients fixed butterfly needles in control group were lower than those in experimental group(P<0.01), but the drop speed and repeated puncture in experimental group were lower than those in control group(P<0.05). Conclusions The method of stat lock fixing butterfly needles can effectively improve the comfort of patients and cut down the drop speed and repeated puncture, which is suitable for widespread clinical application. Key words: Stat lock; Implantable venous access port; Butterfly needles

A contactless door lock controlled by portable devices

Purpose In our contemporary living environment, most people want, not only to maintain privacy and security, but also to avoid losing the keys or passwords for their doors at home. Additionally, many would like to own a fast, convenient and cost-effective exclusive door lock controller to establish some peace of mind. For this paper, the author has designed a smart door lock device which has a non-contact pattern recognition controller to recognize a tiny pattern that can be displayed by mobile devices. The paper aims to discuss this issue.

Ergonomic evaluation, with the RULA method, of greenhouse tasks of trellising crops.

The present study uses the RULA method to define the most favourable working conditions to lower climbing greenhouse plants, the most problematic task involved in trellising crops. The aim is to prevent potential musculoskeletal disorders to the upper limbs in workers performing this task. The variety of scenarios involving this task was simulated in the laboratory to evaluate different working heights, crop weights, and types of guides handled. From the 2,544 tests made, only some ergonomically favourable conditions were found to be met when the work was done at a height of 1.4 m, although heights of between 1.2 and 1.6 m could prove acceptable. Furthermore, the study shows the importance of the type of hanger needed to perform the work correctly, of the group of hangers tested; ergonomically acceptable handling was possible only with the new-generation ones having the lock device. In the case of using other types of hangers, it is recommended not to support weights greater than 2 kg. In addition to the above recommendations, it is considered vital to guarantee the correct organization of the workday to include recovery times from the earliest working hours, given the repetitive nature of the work, as well as to promote training sessions to avoid incorrect postures, especially regarding the limbs, trunk, wrist, and neck.