Using Novel One-Bit ADC to Design n-Bit ADC

This work presents two novel styles for designing nbit analog to digital converter (ADC). Each of the proposed ADCs is built using novel one-bit cell. The novel cell produces single output bit as a response to an input voltage, in addition, it outputs another analog voltage. The generated analog voltage is used again as an input to the to generate one more bit, and new analog voltage, and so on. The proposed n-bit ADC is built using the novel one-bit cell in two different styles. One design style, by connecting n ADC cells together to construct n-bit ADC that produces parallel binary outputs. The other design style realizes the n-bit ADC using single ADC cell and outputs n-bit serially. In both ADC designs introduced in this work, modularity was the main design parameter. The two different n-bit ADCs have been simulated. The first n-bit ADC with parallel outputs produces clean outputs at 50MS/s, and the other ADC design shows clean serial bits at 5KS/s

Method of placer mining by directional well drilling

The study aims at justifying the method for the development of placers by directed drilling of wells. A description is given of the opening of the site, the receding and oncoming scheme of the digging excavation, drilling and expansion of the wells, the main hydraulic unit with remote control. The physics-mechanical substantiation of technological parameters is given: hydro-jet erosion, the shape and size of the cleaning chambers, the adaptation of hydrotransport calculation methods. With jetting, the required flow rate and pressure of water to break rocks is based on the laws of soil mechanics. The parameters of the clearing space and the shape of the chambers are taken in accordance with the magnitude of the vault of natural equilibrium. As a determining factor in the calculation of gravity hydrotransport, the consistency of the pulp is adopted with observance of the condition necessary for the bearing capacity. To adapt the methodology for calculating the hydraulic lifting of pulp to the conditions of well development, the coefficient of dilution is taken as the main design parameter. Modeling of jetting jet in the laboratory conditions was carried out, dependences of decrease in axial pressure were obtained at removal of the face from the nozzle.

Multi-Objective Frame Optimization Design of Steering Pump Bracket

By analyzing stress contours and deformation contours of the primary bracket, we can know that bracket material is more, contours proves too safe for bracket strength and stiffness. To improve the material utilization rate, topology optimization for bracket is carried by using topology module (DOE) of finite element analysis software workbench14.0. the main design parameter was set up, accordingly to accomplish analysis about the relationship between design parameter with quality. on the basis of analysis results, we improved primary structure that made the bracket quality reduced by 10% and executes verification, we obtained the reasonable structure finally.

An Inverse-Design Method for Centrifugal Pump Impellers

The development of an inverse-design method for the impellers of centrifugal pumps is presented. The flow inside the impeller channel is assumed to be irrotational, inviscid and incompressible. With the inverse-design method infinitely-thin impeller blades can be designed for a given meridional geometry and design conditions. The main design parameter is the mean-swirl distribution, which is specified from leading edge to trailing edge and from hub to shroud. The flow in the impeller channel is solved using the Finite Element Method, employing the mean-swirl distribution as a boundary condition. The blade shape is changed iteratively until the blade impenetrability condition is fulfilled. The method has been verified by considering a case for which an analytical solution is available and by reconstruction of an existing geometry, with known characteristics, using the inverse-design method. As an application of the method a mixed-flow impeller has been designed and the effect of changing the mean-swirl distribution on the resulting blade shape is clearly demonstrated.

Resorbable cages for spinal fusion: an experimental goat model

Object: A biomechanical cadaveric study and an in vivo monosegmental spinal fusion study were performed to evaluate a novel bioresorbable poly(l-lactic acid) (PLLA) cage. Methods: The yield strength of a spinal segment was chosen as the main design parameter for the resorbable cages to be used in a goat model. In a 3-year in vivo study the authors found fusion to be significantly faster and more complete when using PLLA cages compared to titanium cages with the same dimensions. In the PLLA group, the inter-vertebral grafting height did not change and bone remodeling within the cage was completed 2 years after implantation. In terms of degradation of the PLLA, similar features were observed in vivo and in vitro. Conclusions. Degradation was almost completed 3 years after implantation. Tissue reaction was mild during the 3-year period.