The extensive research on public ethics in the local administration is more than necessary. This paper identifies the basic values of and the challenges to Macedonian Legal System in this area, and explains the key et...The extensive research on public ethics in the local administration is more than necessary. This paper identifies the basic values of and the challenges to Macedonian Legal System in this area, and explains the key ethical aspects, which should be implemented in practice by civil servants, who increasingly have to learn how to perform in accordance with ethical values. In this paper I will analyze the ethical values of civil servants laid down by the Organization for Economic Co-operation and Development （OECD） and the Civil Servants Agency in Macedonia, upon which the ethical principles for civil servants in the local administration units are intended to be set. This paper deals with the ethics of civil servants, assessment of best practices, and evaluation of positive and negative indicators. The paper concludes with a few recommendations for the next steps in this process; and some criteria for the consideration of future developments are suggested.展开更多
The interpenetrating network structure provides an interesting avenue to novel materials. Locally resonant phononic crystal （LRPC） exhibits excellent sound attenuation performance based on the periodical arrangement...The interpenetrating network structure provides an interesting avenue to novel materials. Locally resonant phononic crystal （LRPC） exhibits excellent sound attenuation performance based on the periodical arrangement of sound wave scatters. Combining the LRPC concept and interpenetrating network glassy structure, this paper has developed a new material which can achieve a wide band underwater strong acoustic absorption. Underwater absorption coefficients of different samples were measured by the pulse tube. Measurement results show that the new material possesses excellent underwater acoustic effects in a wide frequency range.Moreover, in order to investigate impacts of locally resonant units,some defects are introduced into the sample. The experimental result and the theoretical calculation both show that locally resonant units being connected to a network structure play an important role in achieving a wide band strong acoustic absorption.展开更多
This paper presents a hierarchical simultaneous localization and mapping（SLAM） system for a small unmanned aerial vehicle（UAV） using the output of an inertial measurement unit（IMU） and the bearing-only observati...This paper presents a hierarchical simultaneous localization and mapping（SLAM） system for a small unmanned aerial vehicle（UAV） using the output of an inertial measurement unit（IMU） and the bearing-only observations from an onboard monocular camera.A homography based approach is used to calculate the motion of the vehicle in 6 degrees of freedom by image feature match.This visual measurement is fused with the inertial outputs by an indirect extended Kalman filter（EKF） for attitude and velocity estimation.Then,another EKF is employed to estimate the position of the vehicle and the locations of the features in the map.Both simulations and experiments are carried out to test the performance of the proposed system.The result of the comparison with the referential global positioning system/inertial navigation system（GPS/INS） navigation indicates that the proposed SLAM can provide reliable and stable state estimation for small UAVs in GPS-denied environments.展开更多
Insufficient fresh air supply due to the increased air tightness of building envelopes after building renovations and window upgrades is a major concern of HVAC engineering today.The paper demonstrates the application...Insufficient fresh air supply due to the increased air tightness of building envelopes after building renovations and window upgrades is a major concern of HVAC engineering today.The paper demonstrates the application of CFD simulations in the development of a compact decentralised ventilation unit with integrated heat recovery system for local ventilation of rooms,targeting this common issue.The device houses an innovative cyclically rotating recuperative heat exchanger,allowing effective condensate removal and de-icing in winter for its independent operation throughout the year.The paper introduces the ventilation unit,describes preparation of its numerical models,and conducts CFD simulation using Ansys Fluent software.The initial design of the device was improved following the findings of the numerical analysis,and the proposed adjustments were tested through follow-up CFD simulations,confirming that the desired outcomes were achieved.A separate CFD analysis was performed to assess the use of different air supply elements at the air outlet to the room,recommending the use of adjustable nozzles.A prototype ventilation unit was manufactured and the volume flow rate under different operating conditions was measured to be compared with the simulation results.The outcome of the research is a new type of compact local ventilation unit.An increase in device energy efficiency was achieved,with the aid of simulations,while maintaining its compact size.In addition to presenting the potential of using variant CFD analysis in the development of new HVAC equipment,the paper also indicates the drawbacks of using the Multiple Reference Frame(MRF)method to approximate the rotation of radial fan impellers in CFD simulations.展开更多
文摘The extensive research on public ethics in the local administration is more than necessary. This paper identifies the basic values of and the challenges to Macedonian Legal System in this area, and explains the key ethical aspects, which should be implemented in practice by civil servants, who increasingly have to learn how to perform in accordance with ethical values. In this paper I will analyze the ethical values of civil servants laid down by the Organization for Economic Co-operation and Development （OECD） and the Civil Servants Agency in Macedonia, upon which the ethical principles for civil servants in the local administration units are intended to be set. This paper deals with the ethics of civil servants, assessment of best practices, and evaluation of positive and negative indicators. The paper concludes with a few recommendations for the next steps in this process; and some criteria for the consideration of future developments are suggested.
基金supported by the National Natural Science Foundation of China (Grant No. 10832011)the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KJCX2-YW-L08)
文摘The interpenetrating network structure provides an interesting avenue to novel materials. Locally resonant phononic crystal （LRPC） exhibits excellent sound attenuation performance based on the periodical arrangement of sound wave scatters. Combining the LRPC concept and interpenetrating network glassy structure, this paper has developed a new material which can achieve a wide band underwater strong acoustic absorption. Underwater absorption coefficients of different samples were measured by the pulse tube. Measurement results show that the new material possesses excellent underwater acoustic effects in a wide frequency range.Moreover, in order to investigate impacts of locally resonant units,some defects are introduced into the sample. The experimental result and the theoretical calculation both show that locally resonant units being connected to a network structure play an important role in achieving a wide band strong acoustic absorption.
基金supported by National High Technology Research Development Program of China (863 Program) (No.2011AA040202)National Science Foundation of China (No.51005008)
文摘This paper presents a hierarchical simultaneous localization and mapping（SLAM） system for a small unmanned aerial vehicle（UAV） using the output of an inertial measurement unit（IMU） and the bearing-only observations from an onboard monocular camera.A homography based approach is used to calculate the motion of the vehicle in 6 degrees of freedom by image feature match.This visual measurement is fused with the inertial outputs by an indirect extended Kalman filter（EKF） for attitude and velocity estimation.Then,another EKF is employed to estimate the position of the vehicle and the locations of the features in the map.Both simulations and experiments are carried out to test the performance of the proposed system.The result of the comparison with the referential global positioning system/inertial navigation system（GPS/INS） navigation indicates that the proposed SLAM can provide reliable and stable state estimation for small UAVs in GPS-denied environments.
文摘Insufficient fresh air supply due to the increased air tightness of building envelopes after building renovations and window upgrades is a major concern of HVAC engineering today.The paper demonstrates the application of CFD simulations in the development of a compact decentralised ventilation unit with integrated heat recovery system for local ventilation of rooms,targeting this common issue.The device houses an innovative cyclically rotating recuperative heat exchanger,allowing effective condensate removal and de-icing in winter for its independent operation throughout the year.The paper introduces the ventilation unit,describes preparation of its numerical models,and conducts CFD simulation using Ansys Fluent software.The initial design of the device was improved following the findings of the numerical analysis,and the proposed adjustments were tested through follow-up CFD simulations,confirming that the desired outcomes were achieved.A separate CFD analysis was performed to assess the use of different air supply elements at the air outlet to the room,recommending the use of adjustable nozzles.A prototype ventilation unit was manufactured and the volume flow rate under different operating conditions was measured to be compared with the simulation results.The outcome of the research is a new type of compact local ventilation unit.An increase in device energy efficiency was achieved,with the aid of simulations,while maintaining its compact size.In addition to presenting the potential of using variant CFD analysis in the development of new HVAC equipment,the paper also indicates the drawbacks of using the Multiple Reference Frame(MRF)method to approximate the rotation of radial fan impellers in CFD simulations.
