检索结果-南通市图书馆

International Journal of Extreme Manufacturing 2023年第2期5卷 208-214页

作者： Kotaro Obata Francesc Caballero-Lucas Shota Kawabata Godai Miyaji Koji Sugioka RIKEN Center for Advanced Photonics 2-1 HirosawaWako-shiSaitama 351-0198Japan Department of Applied Physics Tokyo University of Agriculture and Technology2-24-16 NakachoKoganeiTokyo 184-8588Japan

For the practical use of femtosecond laser ablation, inputs of higher laser intensity are preferred to attain high-throughput material removal. However, the use of higher laser intensities for increasing ablation rates can have detrimental effects on ablation quality due to excess heat generation and air ionization. This paper employs ablation using BiBurst femtosecond laser pulses, which consist of multiple bursts(2 and 5 bursts) at a repetition rate of 64 MHz, each containing multiple intra-pulses(2–20 pulses) at an ultrafast repetition rate of 4.88 GHz, to overcome these conflicting conditions. Ablation of silicon substrates using the BiBurst mode with 5 burst pulses and 20 intra-pulses successfully prevents air breakdown at packet energies higher than the pulse energy inducing the air ionization by the conventional femtosecond laser pulse irradiation(single-pulse mode). As a result, ablation speed can be enhanced by a factor of23 without deteriorating the ablation quality compared to that by the single-pulse mode ablation under the conditions where the air ionization is avoided.

关键词： BiBurst mode GHz burst laser ablation silicon air ionization

A CONSIDERATION ON INTERFERENCE BETWEEN NOISE SOURCE AND NOISE RECEIVER

在线全文

学校读者我要写书评

暂无评论

A CONSIDERATION ON INTERFERENCE BETWEEN NOISE SOURCE AND NOI...

Fractal image analysis and bruise damage evaluation of impact damage in guava

1992 International Symposium on Electromagnetic Compatibility(EMC’92/Beijing)

作者： Atsuo Mutoh Shuichi Nitta Nobuyoshi Yamakoshi tokyo University of Agriculture and Technology 2-24-16 Naka-cho Koganel Tokyo 184 JAPAN

＜正＞This paper describes the mutual interference between noise source and noise victim. Paying attention to resonance points shown on frequency- impedance characteristics curve of source,victim （noise receiver） and their combination, respectively,the influence of victim characteristics for noise source characteristics and the dominance of victim are clarified under various coupling conditions.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Information Processing in agriculture 2024年第2期11卷 217-227页

作者： Than Htike Rattapon Saengrayap Hiroaki Kitazawa Saowapa Chaiwong School of Agro-Industry Mae Fah Luang UniversityChiang Rai 57100Thailand Department of agriculture Ministry of AgricultureLivestock and Irrigation 11181Myanmar Integrated Agri-Tech Ecosystem Research Group Mae Fah Luang UniversityChiang Rai 57100Thailand Institute of Food Research National Agriculture and Food Research OrganizationIbaraki 305-8642Japan

Impact bruise damage and quality of‘Gim Ju’guava were investigated for different drop heights and number of drops using fractal image *** the impact test,a stainless-steel metal ball(250 g)was dropped on fruit from three drop heights(0,0.3,0.6 m)either once or five *** quality was evaluated for impact energy,bruise area(BA),bruise volume(BV),bruise susceptibility,bruise score and pulp color(L*,a*,b*and C values).The fractal dimension(FD)value using fractal image analysis was analyzed at the bruise *** showed that five drops(0.3 m)with a high impact energy(3678.75 J)and a single drop(0.6 m)with a low impact energy(1471.50 J)exhibited no significant in BA,BV,bruise score as well as all color values(L*,a*,b*and C).While the FD value of a single drop from 0.6 m had a higher FD value than that of five drops from 0.3 *** is indicated that FD exhibited a better performance to classify impact bruising level of guava than BA,BV and color *** FD value gradually decreased with increase of storage time and bruise *** correlation coefficient(r)values of FD(r=−0.794 and−0.745)between BA and BV were more significant than those L*(r=−0.660 and−0.615)and a*(r=0.579 and 0.473).The coefficient of determination(R^(2))of the polynomial equation in bruised fruit(R^(2)=0.85 to 0.99)was greater than the control(no bruise)(R^(2)=0.80).A higher R^(2)val(0.88 and 0.92)was exhibited at five ***,FD analysis showed greater potential than color measurement to assess bruise impact damage in guava.

关键词： Bruise susceptibility Impact bruise Mechanical injury Transportation

Geometric based apple suction strategy for robotic packaging

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2024年第3期17卷 12-20页

作者： Zhong Wang Qingyu Wang Mingzhao Lou Fan Wu Yaonan Zhu Dong Hu Mingchuan Zhou Yibin Ying College of Optical Mechanical and Electrical EngineeringZhejiang A&F UniversityHangzhou 311300China College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China Key Laboratory of Intelligent Equipment and Robotics for agriculture of Zhejiang Province Zhejiang UniversityHangzhou 310058China Department of Micro-Nona Mechanical Science and Engineering Nagoya UniversityFuro-choChikusa-kuNagoya 464-8601Japan

Packaging is one of the least automated steps among all the fruit postharvest processes,which is time-consuming and ***,a robust suction strategy for robotic manipulation needs to be *** this research,a geometric-based apple suction strategy for robotic packaging was studied,including suction cup design,optimal suction region selection algorithm,and robot system *** the first place,on the basis of the geometric features of the spheroid fruit,the structure of the suction cups was designed to provide reliable suction ***,suction force measurement experiments on both acrylic balls and apples were *** on the results,the parameters of the suction cup were finally *** results also indicated that the curvature radius of the suction region is supposed to larger than that of the suction ***,a robust suction region selection algorithm was developed,which involves four steps:RGB-D information acquisition,object detection and point cloud generation,spherical fitting,and suction region ***,the above methods were integrated into a robotic packaging *** addition,on the basis of spatial-frequency domain imaging(SFDI)technology,early stage bruise was detected for *** results showed that,the proposed suction strategy and system is potential for robust robotic apple packaging.

关键词： apple suction cup robotic packaging robotic manipulation point cloud

Characteristics of In-Situ Soil Water Hysteresis Observed through Multiple-Years Monitoring

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2024年第5期12卷 162-175页

作者： Ippei Iiyama School of agriculture Utsunomiya University Utsunomiya Japan

A soil water retention curve (SWRC) is an essential soil physical property for analyzing transport and retention of water in a soil layer. A SWRC is often described as a single-valued function that relates the soil water potential ψ to volumetric water content θ of the soil. However, an in-situ ψ − θ relation should show soil water hysteresis, though this fact is often neglected in analyses of field soil water regimes while long-term in-situ soil water hysteresis is not well characterized. This study aimed at probing and characterizing in-situ ψ − θ relations. The developments of large hysteresis in the in-situ ψ − θ relations were observed only a few times during the study period of 82 months. Any of the large hysteretic behaviors in the ψ − θ relations began with an unusually strong continual reduction in ψ. The completion of a hysteresis loop required a recorded maximum rainfall. Because the study field had very small chances to meet such strong rainfall events, it took multiple years to restore the fraction of soil water depleted by the unusually strong continual reduction in ψ. While wetting-drying cycles had occurred within a certain domain of ψ, hysteretic behaviors tended to be so small that the in-situ ψ − θ relation can be approximated as a single-valued function of θ(ψ). These observed patterns of the in-situ ψ − θ relations were characterized by kinds of difference in dθ/dψ between a drying process and a wetting process at a given ψ. Thus, more amounts of experimental facts about wetting SWRCs in parallel with drying SWRCs should be needed for correct modelling, analyzing, and predicting soil water regimes in fields. It is also necessary to increase our understandings about the long-term trends of occurrences of extreme weather conditions associated with possible change in climate.

关键词： Atmospheric Conditions Field Water Regimes Hysteretic Behaviors Soil Moisture Conditions Soil Water Characteristic Curves Specific Water Capacity Wetting-Drying Cycles

Selective removal of Cr(Ⅵ)using polyvinylpyrrolidone and polyacrylamide co-modified MoS_(2) ccomposites by adsorption combined with reduction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第6期35卷 524-530页

作者： Shuqi Yu Yu Yang Keisuke Kuroda Jian Pu Rui Guo Li-An Hou State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Department of Environmental and Civil Engineering Toyama Prefectural UniversityImizuToyama 939-0398Japan Institute for the Advanced Study of Sustainability United Nations UniversityJingumae 5-53-70Shibuya-kuTokyo 150-8925Japan Technical Centre for Soil Agriculture and Rural Ecology and EnvironmentMinistry of Ecology and EnvironmentBeijing 100012China

Cr(Ⅵ),one of the most hazardous metal pollutants,poses significant threats to the environment and human ***,a novel MoS_(2) composite(MoS_(2)/PVP/PAM)modified by polyvinylpyrrolidone(PVP)and polyacrylamide(PAM)was synthesized to enhance the removal of Cr(Ⅵ).Characterization analysis including SEM,XRD,FTIR,and XPS indicated that PVP and PAM could increase the interlayer spacing and the dispersibility of MoS_(2),and introduce pyrrolic N and amino functional *** batch experiments showed that MoS_(2)/PVP/PAM represented excellent Cr(Ⅵ)removal performance over a wide p H range,and exhibited a significantly higher maximum Cr(Ⅵ)adsorption capacity(274.73 mg/g,at p H 3.0,and 298 K)than pure MoS_(2).The adsorption of Cr(Ⅵ)followed Langmuir and pseudo-second-order kinetic model,which was a homogeneous monolayer chemisorption ***_(2)/PVP/PAM showed stable removal of Cr(Ⅵ)in the presence of humic acid(HA),interfering cations and anions at different ***,it had excellent selectivity for Cr(Ⅵ)(K_(d) value of 1.69×10^(7)m L/g)when coexisting with a variety of competing *** characterization revealed that Cr(Ⅵ)was reduced to low toxicity Cr(Ⅲ)by Mo^(4+)and S^(2-),and then chelated on the surface of the adsorbent by pyrrolic *** research expanded the design concept for MoS_(2) composites by demonstrating the potential of MoS_(2)/PVP/PAM as a promising material for selective elimination of Cr(Ⅵ)in water.

关键词： Polyvinylpyrrolidone Polyacrylamide MoS_(2) Cr(Ⅵ)removal Adsorbent Reduction

Design and Prototyping of Micro Centrifugal Compressor

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2003年第1期12卷 33-37页

作者： Shimpei Mizuki Gaku Minorikawa Toshiyuki Hirano Yuichiro Asaga Naoki Yamaguchi Yutaka Ohta Eisuke Outa 1. Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Waseda University 4-1Department of Mechanical Engineering Waseda University 4-1 Department of Mechanical Engineering Hosei University 7-2 Kajinocho 3 chome Koganei-shi Tokyo 184-8584JapanKajinocho 3 chome Koganei-shi Tokyo 184-8584JapanKajinocho 3 chome Koganei-shi Tokyo 184-8584Japan Kajinocho 3 chome Koganei-shi Tokyo 184-8584JapanKajinocho 3 chome Koganei-shi Tokyo 184-8584Japan Ohkubo 3 chome Shinjuku-ku Tokyo 169-8555JapanOhkubo 3 chome Shinjuku-ku Tokyo 169-8555Japan

In order to establish the design methodology of ultra micro centrifugal compressor,wich is the most important component of ultra micro gas turbine unit,a 10 times of the final target size model was designed,prototyped and *** problems to be solved for downsizing were examined and 2-dimensional impeller was chosen as the first model due to its *** conventional 1D prediction *** and the inverse design were *** prototyped compressor was driven by using a turbocharger and the performance characteristics were measured.

关键词：离心式压缩机设计性能

Computational Analysis of Silica gel-Water Adsorption Refrigeration Cycle with Vapor Recovery

在线全文

学校读者我要写书评

暂无评论

Computational Analysis of Silica gel-Water Adsorption Refrig...

Operator-Based Robust Nonlinear Control for SISO and MIMO Nonlinear Systems With PI Hysteresis

第一届亚洲制冷空调大会

作者： Akira AKAHIRA K.C.Amanul Alam Yoshinori HAMAMOTO Atsushi AKISAWA Takao KASHIWAGI tokyo university of Agr. ＆ Tech. 2-24-16 Nakacho Koganei Tokyo 184-8588 tokyo university of Agr. ＆ Tech. 2-24-16 Nakacho Koganei Tokyo 184-8588 tokyo university of Agr. ＆ Tech. 2-24-16 Nakacho Koganei Tokyo 184-8588 tokyo university of Agr. ＆ Tech. 2-24-16 Nakacho Koganei Tokyo 184-8588 tokyo university of Agr. ＆ Tech. 2-24-16 Nakacho Koganei Tokyo 184-8588

＜正＞The study aims at clarifying the performance of silica gel-water adsorption refrigeration cycle with mass recovery process. A new strategy of mass recovery is proposed. Two cases of mass recovery process are studied and the performances are compared with the performances of conventional two-bed adsorption cycle. One is the conventional mass recovery process in which no heating and cooling are applied to the beds during the mass recovery process, the other is the newly proposed mass recovery process in which beds heating and cooling process are continued during the mass recovery proofs. A cycle simulation program is developed tn predict the performance of the proposed cycle. The results show that the proposed strategy along with mass recovery cycle improves cooling capacity significantly, which is highly desirable in view point of reducing system size. It is slso seen that COP values of the cycle without heating and cooling is increased by 28%, and cooling capacity of the mass recovery cycle with heating and cooling is increased from 11% than those of conventional single stage cycle at hot water temperature 60℃. The results show that mass recovery process has influential effect if the heat source temperature is low.

关键词： Adsorption Refrigeration cycle Mass recovery Silica gel Cooling capacity

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2018年第2期5卷 523-530页

作者： Shuhui Bi Lei Wang Shengjun Wen Mingcong Deng School of Electrical Engineering University of Jinan Jinan 250022 China Shandong Provincial Key Laboratory of Automotive Electronics technology Institute of Automation Shandong Academy of Sciences Qilu University of Technology (Shandong Academy of Sciences) Jinan 250014 China Department of Electronic and Information Engineering Zhongyuan University of Technology Zhengzhou 450007 China Department of Electrical and Electronic Engineering Tokyo University of Agriculture and Technology 2-24-16 Nakacho KoganeiTokyo 184-8588 Japan IEEE

In this paper, operator based robust nonlinear control for single-input single-output(SISO) and multi-input multi-output(MIMO) nonlinear uncertain systems preceded by generalized Prandtl-Ishlinskii(PI) hysteresis is considered respectively. In detail, by using operator based robust right coprime factorization approach, the control system design structures including feedforward and feedback controllers for both SISO and MIMO nonlinear uncertain systems are given, *** which, the controller design includes the information of PI hysteresis and its inverse, and some sufficient conditions for the controllers in both SISO and MIMO systems should be satisfied are also derived respectively. Based on the proposed conditions, influence from hysteresis is rejected, the systems are robustly stable and output tracking performance can be ***, the effectiveness of the proposed method is confirmed by numerical simulations.

关键词： Index Terms-Generalized PI hysteresis operator based robustright coprime factorization robust nonlinear control.

Prototyping of Ultra Micro Centrifugal Compressor-Influence of Meridional Configuration

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2011年第4期20卷 312-317页

作者： Toshiyuki Hirano Tadataka Muto Hoshio Tsujita Production Systems Engineering Course Tokyo Metropolitan College of Industrial Technology Graduate School of Engineering Hosei University3-7-2KajinochoKoganei-shiTokyo184-8584Japan Department of Mechanical Engineering Faculty of Science and EngineeringHosei University

In order to investigate the design method for a micro centrifugal compressor, which is the most important component of an ultra micro gas turbine, two types of centrifugal impeller with 2-dimensional blade were designed, manufactured and tested. These impellers have different shapes of hub on the meridional plane with each other. Moreover, these types of impeller were made for the 5 times and the 6 times size of the final target centrifugal impeller with the outer diameter of 4ram in order to assess the similitude for the impellers. The comparison among the performance characteristics of the impellers revealed the influence of the meridional configuration on the performance and the similitude of the compressors.

关键词： Ultra Micro Centrifugal Compressor Performance Characteristics Impeller Meridional Configuration