Results 1 - 10 of 1078
Results 1 - 10 of 1078. Search took: 0.027 seconds
|Sort by: date | relevance|
[en] The development of forward design of contact dynamic seals is an inevitable way to realize the independent development of core key components based on the research results of existing rubber and plastic seals. This paper proposes a multi-index comprehensive evaluation system for sealing performance. Based on the requirements of multiple performance indexes of dynamic sealing systems, a comprehensive evaluation of multiple index functions is constructed to provide a comprehensive evaluation of the performance of rubber and plastic seals. Based on the specific design examples of air contact seals, the design process of a certain seal is explored. Finally, the article elaborates on the future work of the forward design method and its development direction. (paper)
[en] One of the biggest challenges in vocal transformation with TD-PSOLA technique is the selection of modified parameters that will make a successful speech resynthesis. The best selection methods are by using human ratters. This study focuses on automatic determination of the pathological voice transformation coefficients using an Artificial Neural Network this way by comparing the results to the previous manual work. Four characterizied parameters (RATA-PLP, Jitter, Shimmer and RAP) were chosen. The system is developed with supervised training, consists of recognition (neural network) for synthesis (TD-PSOLA). The experimental results show that the parameter sets selected by the proposed system can be successfully used to resynthesize and demonstrating that our system can assist in vocal of pathological voice's transformation.
[en] This paper presents a performance evaluation framework for streetscape vegetation. A performance index (PI) is conceived using the following seven traits, specific to the street environments – Pollution Flux Potential (PFP), Carbon Sequestration Potential (CSP), Thermal Comfort Potential (TCP), Noise Attenuation Potential (NAP), Biomass Energy Potential (BEP), Environmental Stress Tolerance (EST) and Crown Projection Factor (CPF). Its application is demonstrated through a case study using fifteen street vegetation species from the UK, utilising a combination of direct field measurements and inventoried literature data. Our results indicate greater preference to small-to-medium size trees and evergreen shrubs over larger trees for streetscaping. The proposed PI approach can be potentially applied two-fold: one, for evaluation of the performance of the existing street vegetation, facilitating the prospects for further improving them through management strategies and better species selection; two, for planning new streetscapes and multi-functional biomass as part of extending the green urban infrastructure. - Highlights: • A performance evaluation framework for streetscape vegetation is presented. • Seven traits, relevant to street vegetation, are included in a performance index (PI). • The PI approach is applied to quantify and rank fifteen street vegetation species. • Medium size trees and evergreen shrubs are found more favourable for streetscapes. • The PI offers a metric for developing sustainable streetscape green infrastructure. - A performance index is developed and applied to fifteen vegetation species indicating greater preference to medium size trees and evergreen shrubs for streetscaping.
[en] Coconut oil extracted from the coconut milk obtained from fresh coconuts s often called virgin coconut oil (VCO). VCO is beneficial to health as an anti-oxidant and can lower HDL cholesterol in the blood while increasing blood LDL levels. In Indonesia most of VCO being produced on a small scale of home industries. Its production capacity still needs to be increased by improving production processes and implementing an appropriate technology accordingly. This research aims to conduct a study on making small-scale production machinery needed to produce VCO with reduced production time and improved quality of VCO in accordance with ISO 7381 quality criteria. The experimental results of the VCO machine has been develop and tested show good Coefficient of Performance of the system in amount of 3.93 and 2.8 for heating and cooling system respectively. Temperature of the VCO cooling chamber can be maintained in the range of 8°C to 10°C, as well as for heating, the reactor temperature can be maintained from 39°C to 42°C. The expected goal of this research developing a prototype of VCO production machine was done with ability to provide more efficient production process able to increase volume of VCO result by 23%. (paper)
[en] Systems which perform built-in tests to provide continuous monitoring of system reliability are of increasing interest. To minimize the test overhead it is appropriate to divide the entire system test into several subtests, which are executed during the idle times of the system, i.e., in background mode. In this paper a model using renewal theory is described to determine the probability distribution function and the mean of the duration of an entire system selftest. Finally, we evaluate the effects of selftesting on system performance, expressed by the delays occurring and the decreased throughput of user tasks. Our analysis allows us to compare the performance effects of various test policies. At the end of the paper we deal with optimal subtest lengths
[en] This paper introduces a design of ultra-low phase noise frequency source based on high phase detection frequency. Frequency source is a very important part of modern electronic system. Radar, communication, space technology and so on are inseparable from frequency source. Its performance index directly affects the whole electronic system, and phase noise is one of the most important indicators. In this paper, the scheme of phase-locked technology with high phase detection is mainly used,the phase noise is better than -116dBc/Hz@1kHz, -120dBc/Hz@10kHz, -121dBc/Hz@100kHz when the output frequency is 4.5GHz. The technology of high phase discrimination and low phase noise frequency synthesis in this paper can also be extended to higher and more special frequency bands. It provides a solution of ultra-low phase noise for frequency sources of modern radar, electronic jamming and countermeasure systems. (paper)
[en] The Diesel refrigeration cycle using an ideal quantum gas as the working substance is called quantum Diesel refrigeration cycle, which is different from Carnot, Ericsson, Brayton, Otto and Stirling refrigeration cycles. For ideal quantum gases, a corrected equation of state, which considers the quantum behavior of gas particles, is used instead of the classical one. The purpose of this paper is to investigate the effect of quantum gas as the working substance on the performance of a quantum Diesel refrigeration cycle. It is found that coefficients of performance of the cycle are not affected by the quantum degeneracy of the working substance, which is the same as that of the classical Diesel refrigeration cycle. However, the refrigeration load is different from those of the classical Diesel refrigeration cycle. Lastly, the influence of the quantum degeneracy on the performance characteristics of the quantum Diesel refrigeration cycle operated in different temperature regions is discussed
[en] During the last years, a couple of software to model the behaviour of a rock under P-T-X changes using thermodynamic databases have been developed. The result of such models is a pseudo section or projection in the P-T plane of a phase diagram of a system at a fixed composition, i.e. a phase diagram section. Although its usefulness has been well demonstrated, a comparison between theoretical and experimental data is advisable to see the degree of approximation of the theoretical model to the reality but also to consider the kinetic effects in experiments. In this paper, theoretical and experimental results of the melting of the Ollo de Sapo Gneiss are compared. (Author) 32 refs.