Finger Dimensions Research Articles

High-Efficiency Interdigitated Electrode-Based Droplet Merger for Enabling Error-Free Droplet Microfluidic Systems.

Merging two droplets into a droplet to add and mix two contents is one of the common droplet microfluidic functions with droplet generation and sorting, performing broad ranges of biological and chemical assays in droplets. However, traditional droplet-merging techniques often encounter unsynchronized droplets, causing overmerging or mis-merging, and unwanted merging outside of the desired zone. This is more severe when the incoming droplets to be merged are polydisperse in their sizes, often observed in assays that require long-term incubation, elevated-temperature, and/or multiple droplet processing steps. Here, we developed an interdigitated electrode (IDE)-based droplet merger consisting of a droplet autosynchronizing channel and a merging channel. The autosynchronizing channel provides >95% merging efficiency even when 20% polydispersity in the droplet size exists. The highly localized and enhanced dielectrophoretic force generated by the IDEs on the channel bottom allows droplet merging at an extremely low voltage (4.5 V) and only locally at the IDE region. A systematic evaluation of how various design and operation parameters of the IDE merger, such as IDE finger dimensions, dielectric coating layer thickness, droplet size, and droplet flow speed impact the performance was conducted. The optimized device showed consistent performance even when operating for up to 100 h consecutively at high throughput (100 droplets/s). The presented technology has been integrated into a droplet microfluidics workflow to test the lytic activities of bacteriophage on bacterial host cells with 100% merging efficiency. We expect this function to be integrated into droplet microfluidic systems performing broad ranges of high-throughput chemical and biological assays.

Integration into 3D Printing for Image Processing using AI ML

The challenges of physical measurement for prosthetic development and highlight how our integrated tool offers a remote solution to address these challenges, promoting accessibility, convenience, and active participation in the prosthetic design process. Our Measurement Module for Prosthetic Hand Dimensions is a comparison of Image Processing and Distance Measurement Methods The creation of a module to precisely measure finger dimensions for the creation of prosthetic hands is the main goal of this research project. The module provides distance measurement and image-based input as two different ways to get dimensions. Users place their hands at predetermined distances from a screen in the distance measurement option, while users submit photographs of their hands with reference objects for scale in the image based input option. In order To provide a proper fit and functionality, the collected dimensions are an essential component of the prosthetic hand construction process. The study contrasts the efficiency of distance measurement methods employing cameras or other cameras with image processing techniques like edge recognition and contour analysis. Accuracy, usability, and efficiency are among the factors that are assessed to identify the best method for acquiring dimensions. OpenCV for image processing, TensorFlow for machine learning-based analysis, Tkinter for UI design, Mediapipe for landmark identification and hand tracking, and NumPy for numerical operations are just a few of the open-source libraries that are used in this module. The module's possible influence on improving the creation and customization of prosthetic hands is also covered. By offering insights into effective and precise dimension measurement methodologies for customized prosthetic hand design, the study's findings advance the area of prosthetics

Effects of silver diffusement on TiO2-B2O3 nanocomposite sensor towards hydrogen sensing

ABSTRACT Various finger dimensions of interdigitated electrodes in TiO2-B2O3 nanocomposite sensors were proposed in this study. To study the silver diffusement effect on the hydrogen sensing characteristics at different operating temperatures. The result showed that some of the silver particles diffused to the surface of the TiO2-B2O3 nanocomposite sensor after the annealing process at 500°C. The amount of silver particles diffused into the TiO2-B2O3 surface was contributed by the finger dimension of the interdigitated electrode used in the nanocomposite sensor. The results revealed that the structure of interdigitated electrodes in T65 nanocomposite sensor enhanced the performance at low hydrogen concentrations with response values were approximately 4.78, 11.47, 14.47, 16.58, and 20.00 for 100 ppm, 300 ppm, 500 ppm, 700 ppm, and 1000 ppm, respectively, at the optimum operating temperature of 200°C. The activation energy for all nanocomposite sensors was approximately in the range of 40–70 kJ/mol.

Development of a hand classification system for smart hand wearables

Research purpose: This study aimed to lay a research foundation for smart hand wearable design by classifying the right-hand data of 4545 adults aged 20 to 69. Further, to increase the practical applicability of the hand classification system, a hand type discrimination method and regression equations for the hand dimensions of each type were presented. Methods: This study statistically analyzed eighth Size Korea data with IBM SPSS Ver.26.0. Cluster analysis was performed to classify both finger length and circumference type. Discriminant analysis was conducted, yielding discriminant functions to aid potential smart hand wearable wearers in self-diagnosing their hand types. Linear regression analysis yielded regression equations for the detailed finger dimensions for the pattern-making of smart hand wearables. Results: The finger length type was categorized into four types: the Uphill type, Downhill type, Mountain type, and Horizon type for both men’s and women’s hands. The finger circumference type was categorized into two types, the Cone and Cylinder types, for both men’s and women’s hands. The discriminant function showed a mean accuracy rate of 89.9% and the regression equations a mean explanatory power of 72.9%. Conclusion: The hand classification system proposed in this study aimed to improve the fingertip fit of smart hand wearable products by analyzing the configuration of motion tracking gloves or haptic gloves. In addition, considering the practical applicability for both wearers and designers of smart hand wearables, a discrimination method of finger types for wearers’ self-diagnosis and regression functions of finger dimensions for designers’ pattern making were provided.

Silicon solar cell production line and key performance indicators: A case of study at front size serigraphy stage

Photovoltaic industry has devices power improvement as a main target. This implies that technological advances are continuously implemented in production lines and their power improvements have to be monitored with the suitable key performance indicators. In this work, front size serigraphy design has been selected as process improvement and laminated unit power and cell to module ratio has been defined as the main key performance indicator. Real size silicon PV cells with three different front finger morphologies have been produced in industrial production lines by the use of two front size serigraphy designs. The modification of the finger dimensions (wide/height) from (183.0 μm/31.6 μm) to (184.0 μm/37.6 μm) and (140.0 μm/40.8 μm) leads to a redistribution of the majority produced cell power range from [4.10–4.15) W to [4.10–4.15) W and [4.20–4.25) W respectively. Concerning the cell production, it has successfully been monitored by the laminated unit power indicator along a month when shows an increment from 3.95 W to 4.20 W. Concerning module level, cell to module ratio per process cell range is selected as suitable indicator and monitoring during a year. In the specific case of [4.30–4.35) W cell range, cell to module ratio decrease from 7.7 % to 6.5 %

An Anthropometric Investigation of IndexFinger Length Ratio toRing Finger (2d:4d) in Schizophrenic Men Living in Khorasan Razavi

Introduction:Schizophrenia is a group of mental disorders that its main characteristics are failure to understand reality and inability to do daily tasks. Anthropometry, which is a type of biometrics, is a science that measures the dimensions and angles of body parts, as well as skin lines and fingerprints on living people. Perhaps knowledge about natural features of finger dimensions provides useful information in the field of medical anthropometry. Therefore, anthropometric properties of the fingers can be used to identify and develop research in this topic. And given that finger length, like brain development, is formed by a family of developmental genes. So, the objective was to find a link between brain violation and finger length.Method:This study was a case-control and cross-sectional sampling was done in the one-year. The index and ring finger lengths of both hands in 62 schizophrenic men and 72 healthy subjects who were not diagnosed and aged 18 to 65 years old living in Khorasan Razavi were measured by digital caliper.Result:Significant differences were observed between the average index finger lengths (2d:4d) in men’s right hand of healthy and schizophrenic subjects. Among other variables, significant differences weren’tobserved between healthy and patients. Conclusion:It may seem that the results above are used by methods for genetic studies of biometric changes in people with schizophrenia from the index finger length ratio to the right and left ring fingers for further studies to make an estimation and generation. It’s essential to spread the similar statistical research wider statistical societies.Declaration of Interest: None

Correlation between Dimension of Fingers Phalannx Proximal and Height in the Age of 18-45 Years Old

Abstract: Height is one of the data needed in forensic identification process of a remains that is difficult to identify in an incomplete condition. Height estimation can be determined by the proximal phalanx of the fingers which are long bones. This study was conducted on 113 men and 125 women in several places in Riau Province age 18 - 45 years. The height and dimensions of the proximal phalanx of the fingers are measured to get the correlation and linear regression formula for height. There are 6 dimensions measured on the fingers of the left and right hand. The study design was cross sectional. The statistical test used is Pearson correlation to determine the correlation between dimensions of the proximal phalanx on fingers with height and linear regression analysis for height regression formula. The results show that some dimensions of the proximal phalanx of the fingers are significantly correlated with height. Keywords: identification, height, dimensions of the proximal phalanx bone fingers, correlation, regression formula.

Static Thermal Coupling Factors in Multi-Finger Bipolar Transistors: Part II-Experimental Validation

In this paper, we extend the model developed in part-I of this work to include the effects of the back-end-of-line (BEOL) metal layers and test its validity against on-wafer measurement results of SiGe heterojunction bipolar transistors (HBTs). First we modify the position dependent substrate temperature model of part-I by introducing a parameter to account for the upward heat flow through BEOL. Accordingly the coupling coefficient models for bipolar transistors with and without trench isolations are updated. The resulting modeling approach takes as inputs the dimensions of emitter fingers, shallow and deep trench isolation, their relative locations and the temperature dependent material thermal conductivity. Coupling coefficients obtained from the model are first validated against 3D TCAD simulations including the effect of BEOL followed by validation against measured data obtained from state-of-art multifinger SiGe HBTs of different emitter geometries.

Static Thermal Coupling Factors in Multi-Finger Bipolar Transistors: Part I—Model Development

In this part, we propose a step-by-step strategy to model the static thermal coupling factors between the fingers in a silicon based multifinger bipolar transistor structure. First we provide a physics-based formulation to find out the coupling factors in a multifinger structure having no-trench isolation (cij,nt). As a second step, using the value of cij,nt, we propose a formulation to estimate the coupling factor in a multifinger structure having only shallow trench isolations (cij,st). Finally, the coupling factor model for a deep and shallow trench isolated multifinger device (cij,dt) is presented. The proposed modeling technique takes as inputs the dimensions of emitter fingers, shallow and deep trench isolations, their relative locations and the temperature dependent material thermal conductivity. Coupling coefficients obtained from the model are validated against 3D TCAD simulations of multifinger bipolar transistors with and without trench isolations. Geometry scalability of the model is also demonstrated.

Sex estimation from radiogrametric linear dimensions of the metacarpals and phalanges in a Nigerian population

The study evaluated the sex-estimative capabilities of the digital radiogrametric linear dimensions of the metacarpals, proximal, middle, and distal phalanges of a Nigerian population. One hundred adults (50 male and 50 female) computed x-ray images of the right hand, obtained from 7 radiologic centres in different hospitals in Kwara and Lagos State were used for the study. Linear dimensions (length alone) of each bone were digitally measured (in millimetres; mm) from the apex to the base using MicroDicom Viewer (Version 3.1.4). The data were entered and managed into Microsoft excel (2016) and imported into SPSS Version 23 (IBM® Armonk, USA) for analysis. Discriminant Function Analysis (DFA) was used to evaluate the sex-discriminatory characteristics of the different bone dimensions (confidence level was set at 95 %; p < 0.05 was taken to be significant). The result showed that only the metacarpals (M_1D - M_5D) and Proximal phalanges (PP_3D - PP_5D) exhibited significant sex differences (P < 0.05), and was entered into the DFA model. (P> 0.05). The canonical correlations (CC) were 0.523 ([R2[M] = 27.3 %]; with Wilks’ Lambda Λ = 0.727, P = 0.000) and 0.428 ([R2[PP] = 18.3 %]; with Wilks’ Lambda Λ = 0.817, P = 0.002) for the metacarpals and proximal phalanges respectively. After cross-validation, accurate classification into group membership (sex) was achieved with an accuracy of 69.0 % using the metacarpals and 66.0 % using the proximal phalanges. Therefore, it can be concluded that the segregated skeletal finger dimensions are not very reliable as a stand-alone anatomical structure for sex-discrimination, but could serve as an adjunct during biological profiling in human identification.

Development of a Regression Model to Determine Tooth Size Dimensions from Finger Nail Beds- An Innovative Approach

Introduction: Teeth selection is a crucial step and reflects the aesthetic quality of complete dentures and the prime responsibility to ensure their selection with maximum precision lies with the dentist. The anterior teeth reflect the overall aesthetic value of the denture, and hence the need to individualise maxillary anterior teeth was recognised, and the study was undertaken to find an alternative method of teeth selection. Aim: To establish an alternate/additional method of teeth selection for edentulous patients using extraoral landmarks. Materials and Methods: This observational cross-sectional study was conducted in School of Dental Sciences, Krishna Institute of Medical Sciences “Deemed To Be University”, Karad, Maharashtra for a time period of three months (April-June 2015). Dimensions of 402 maxillary central and lateral incisors were measured using a vernier caliper. The superior point selected was the gingival zenith of the teeth and the inferior point was the mid-point of the incisal edge. A line connecting these points determined the teeth length. Similarly, width was determined by marking the midpoint of the proximal surfaces and line connecting them. The points considered for recording the dimensions of the finger nail bed were the mid-points of the mesial and lateral surfaces of the nail bed and mid-points of the superior and inferior edges of the nail bed, respectively. The dimensions of maxillary right central incisor were correlated with the dimensions of right nail bed of index, ring and little finger. Similar procedure was followed for the left central incisor; left and right lateral incisors, respectively. The recorded data were statistically analysed using SPSS version 20 to find out Pearson’s correlation coefficient (r) between dimensions of maxillary incisors and finger nail beds. Further regression equation was derived to determine dimensions of maxillary incisors (dependent variable) from dimensions of nail beds (independent variables) for variables with significant correlations. The p-value less than or equal to 0.05 was taken significant. Results: In males, the central incisor length significantly correlated with little finger nail bed width (p=0.01*). The lateral incisor length had significant correlation with index finger nail bed width (p=0.03*), and little finger nail bed width (p=0.02*). The lateral incisor width had significant correlation with index finger nail bed width (p=0.01*). In females, the lateral incisor width had significant correlation with index finger nail bed width (p=0.01*) and ring finger nail bed length (p=0.002*). Further using the correlations for significant variables, regression formulae were developed. Conclusion: The regression model developed for male and female patients can be used to determine the dimensions of lateral incisor width in females, and central incisor length, lateral incisor length and width in males from the dimensions of index, ring and little fingers. The model stands true as a potential method of teeth selection for edentulous patients.

Determination of sex from hand and finger dimensions in a regional eastern Indian population using discriminant function analysis

Determination of sex from hand and finger dimensions in a regional eastern Indian population using discriminant function analysis

Design and fabrication of prosthetic glove for hand rehabilitation

This paper presents the design and fabrication of cost effective prosthetic glove prototype for hand rehabilitation. Three different design prototypes are modeled and analysed. The unique design feature of selected prototype is its half ring servomotor operated design which is easily adjustable with varying dimensions of patient fingers. Half ring design prototype parts made up of Polylactic Acid (PLA) material are fabricated using 3D printing process. The prototype is capable to successfully conduct flexion and extension of fingers using strings attached to servomotors. In future, this device will be integrated with force sensitive resistors and controllers which need to be clinically tested on physiotherapy patients for different disability levels.

An anthropometric study for the anthropomorphic design of tomato-harvesting robots

To explore how humans can dexterously pick fruits of various sizes from a tomato plant from different positions and postures, some anthropometric dimensions related to the hand-harvesting of the fruits were determined within 261 volunteers, and their correlations were investigated using a bivariate correlation analysis method. The heights of the body (stature), shoulder tip, waist and knee of participants ranged from 111.2 to 193.6, 87.5 to 163.0, 62.1 to 117.3, and 31.0 to 56.0 cm, respectively; the ratios of the knee height, waist height, and shoulder tip height to the stature were 0.25–0.33, 0.52–0.65, and 0.76–0.87, respectively; the shoulder tip breadth, upper limb length and foot length of participants ranged from 26.0 to 48.5, 45.4 to 85.6, and 19.5 to 28.0 cm, respectively; and the length ratios of the hand, forearm, and upper arm to the upper limb were 0.23–0.31, 0.29–0.38, and 0.35–0.45, respectively. There were high linear correlations among the stature, waist height and knee height, between the forearm and hand lengths, and among the stature, hand length and arm length and moderate linear correlations between most hand dimensions. These human body dimensions determine the upper limb workspace, body balance, working comfort and lower limb movement frequency during picking, and this information will be useful for the bionic dimensional synthesis design of a harvesting robotic arm, walking mechanism and body. The results of multiple comparisons in ANOVA showed that there were significant differences between some of the finger dimensions and between some of the hand-scaling dimensions, which is one of the main features enabling the human hand to pick various sizes of fruits. This study can provide guidance and inspiration for the anthropomorphic design of robotic tomato-harvesting end-effectors.

Variations of Dark and Photo Currents of Metal-Semiconductor-Metal Photodetectors Fabricated on Ge Epilayer Grown on Si Substrate Caused by the Dimension of Interdigitated Pt Finger Electrodes

Metal-semiconductor-metal (MSM) photodetectors (PDs) with interdigitated Pt finger electrodes were fabricated on Ge films grown epitaxially on a (100) Si substrate (Ge-on-Si) by rapid thermal chemical vapor deposition (RTCVD), and the effects of the finger dimensions on their optoelectrical properties were investigated. The two-step Ge heteroepitaxial growth technique through RTCVD, where a Ge seed layer was used in first-step growth at 350° C followed by second-step growth of a Ge film at high temperatures (500° C), led to the formation of a high-quality Ge epitaxial layer with excellent surface and interface morphologies. The dark current of Ge-on-Si MSM PD increased with decreasing finger width/spacing, which could be associated with electric field crowding near the contact electrode. As a result of the significant creation of electronhole pairs followed by their subsequent drift through the Ge epilayer toward the finger electrode, the Ge-on-Si MSM PDs exhibited a considerable spectral response to wavelengths in the range, 1530–1550 nm, regardless of the finger dimensions. A higher electric field was observed in the finger electrodes closer to each other, which enhanced the collection efficiency of the photo-generated carriers, which could be responsible for higher responsivity of Ge-on-Si MSM PDs with a smaller finger width/spacing.

Preferential flow systems amended with biogeochemical components: imaging of a two-dimensional study

Abstract. The vadose zone is a highly interactive heterogeneous system through which water enters the subsurface system by infiltration. This paper details the effects of simulated plant exudate and soil component solutions upon unstable flow patterns in a porous medium (ASTM silica sand; US Silica, Ottawa, IL, USA) through the use of two-dimensional tank light transmission method (LTM). The contact angle (θ) and surface tension (γ) of two simulated plant exudate solutions (i.e., oxalate and citrate) and two soil component solutions (i.e., tannic acid and Suwannee River natural organic matter, SRNOM) were analyzed to determine the liquid–gas and liquid–solid interface characteristics of each. To determine if the unstable flow formations were dependent on the type and concentration of the simulated plant exudates and soil components, the analysis of the effects of the simulated plant exudate and soil component solutions were compared to a control solution (Hoagland nutrient solution with 0.01 M NaCl). Fingering flow patterns, vertical and horizontal water saturation profiles, water saturation at the fingertips, finger dimensions and velocity, and number of fingers were obtained using the light transmission method. Significant differences in the interface properties indicated a decrease between the control and the plant exudate and soil component solutions tested; specifically, the control (θ= 64.5∘ and γ= 75.75 mN m−1) samples exhibited a higher contact angle and surface tension than the low concentration of citrate (θ= 52.6∘ and γ= 70.8 mN m−1). Wetting front instability and fingering flow phenomena were reported in all infiltration experiments. The results showed that the plant exudates and soil components influenced the soil infiltration as differences in finger geometries, velocities, and water saturation profiles were detected when compared to the control. Among the tested solutions and concentrations of soil components, the largest finger width (10.19 cm) was generated by the lowest tannic acid solution concentration (0.1 mg L−1), and the lowest finger width (6.00 cm) was induced by the highest SRNOM concentration (10 mg L−1). Similarly, for the plant exudate solutions, the largest finger width (8.36 cm) was generated by the lowest oxalate solution concentration (0.1 mg L−1), and the lowest finger width (6.63 cm) was induced by the lowest citrate concentration (0.1 mg L−1). The control solution produced fingers with average width of 8.30 cm. Additionally, the wettability of the medium for the citrate, oxalate, and SRNOM solutions increased with an increase in concentration. Our research demonstrates that the plant exudates and soil components which are biochemical compounds produced and released in soil are capable of influencing the process of infiltration in soils. The results of this research also indicate that soil wettability, expressed as (cos θ)1∕2, should be included in the scaling of the finger dimension, i.e., finger width, when using the Miller and Miller (1956) scaling theory for the scaling of flow in porous media.

Dorsal and palmar aspect dimensions of hand anthropometry for designing hand tools and protections

AbstractMost hand anthropometric studies are performed on the palmar aspect, while dimensions of the dorsal aspect are also useful in ergonomics and hand modeling. A survey of hand anthropometrics for a Spanish population (69 females, 70 males) is presented. Landmarks were selected to compare lengths from the dorsal and palmar aspects and to be useful for hand modeling and ergonomics design. Ninety‐nine dimensions of fingers and thumb of the right hand (41 lengths, 32 depths, 26 breadths) were collected, including thumb breadths and depths. Descriptive statistics of all the dimensions are presented. Lengths were measured from both dorsal and palmar aspects and paired lengths compared through t‐tests. Significant differences were found in almost all the lengths, showing that databases should explicitly state the aspect (dorsal or palmar) where dimensions have been measured. The data provided are useful for designing tools and hand protections and developing hand models more accurately.

Anomalous diffusion on a fractal mesh.

We present exact analytical results for properties of anomalous diffusion on a fractal mesh. The fractal mesh structure is a direct product of two fractal sets, one belonging to a main branch of backbones, the other to the side branches of fingers. Both fractal sets are constructed on the entire (infinite) y and x axes. We suggest a special algorithm in order to construct such sets out of standard Cantor sets embedded in the unit interval. The transport properties of the fractal mesh are studied, in particular, subdiffusion along the backbones is obtained with the dispersion relation 〈x^{2}(t)〉≃t^{β}, where the transport exponent β<1 is determined by the fractal dimensions of both backbone and fingers. Superdiffusion with β>1 has been observed as well when the environment is controlled by means of a memory kernel.

Investigation of methods for estimating hand bone dimensions using X-ray hand anthropometric data

This study examined two conversion methods, M1 and M2, to predict finger/phalange bone lengths based on finger/phalange surface lengths. Forty-one Korean college students (25 males and 16 females) were recruited and their finger/phalange surface lengths, bone lengths and grip strengths were measured using a vernier caliper, an X-ray generator and a double-handle force measurement system, respectively. M1 and M2 were defined as formulas able to estimate finger/phalange bone lengths based on one dimension (i.e., surface hand length) and four finger dimensions (surface finger lengths), respectively. As a result of conversion, the estimation errors by M1 presented mean 1.22 mm, which was smaller than those (1.29 mm) by M2. The bone lengths estimated by M1 (mean r = 0.81) presented higher correlations with the measured bone lengths than those estimated by M2 (0.79). Thus, the M1 method was recommended in the present study, based on conversion simplicity and accuracy.

Multi-Material Front Contact for 19% Thin Film Solar Cells.

The trade-off between transmittance and conductivity of the front contact material poses a bottleneck for thin film solar panels. Normally, the front contact material is a metal oxide and the optimal cell configuration and panel efficiency were determined for various band gap materials, representing Cu(In,Ga)Se2 (CIGS), CdTe and high band gap perovskites. Supplementing the metal oxide with a metallic copper grid improves the performance of the front contact and aims to increase the efficiency. Various front contact designs with and without a metallic finger grid were calculated with a variation of the transparent conductive oxide (TCO) sheet resistance, scribing area, cell length, and finger dimensions. In addition, the contact resistance and illumination power were also assessed and the optimal thin film solar panel design was determined. Adding a metallic finger grid on a TCO gives a higher solar cell efficiency and this also enables longer cell lengths. However, contact resistance between the metal and the TCO material can reduce the efficiency benefit somewhat.