检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

零碳实验室建设方案

实验室检测

实验室检测 2024年第2期2卷 78-83页

作者：孙伟卢俊琛莫层聪刘亮俊嘉兴市恒光电力建设有限责任公司安大安全工器具检测中心嘉兴314000 九郡绿建技术(嘉兴)有限公司嘉兴314000

为探索建设零碳实验室方案,开发低碳技术和寻求相关难题解决方案,以减少能源消耗和碳排放量来解决环境问题。通过先进的技术及实践探索,建立和完善低碳经济体系,扩大相关产业规模来促进经济结构优化。本文所研究的检测实验室建设方案中... 详细信息

为探索建设零碳实验室方案,开发低碳技术和寻求相关难题解决方案,以减少能源消耗和碳排放量来解决环境问题。通过先进的技术及实践探索,建立和完善低碳经济体系,扩大相关产业规模来促进经济结构优化。本文所研究的检测实验室建设方案中运行阶段自主减排、可再生能源利用、碳汇等措施实施后,实验室碳排放量为负值,可被定义为零碳实验室。建设零碳实验室作为全球环保和节能减排的重要行动之一,也被视作倡导可持续发展的生态文明观念的实际落实者。从中可以更深层次地理解并促进人类走向可持续、低碳未来的发展方向。

关键词：零碳实验室减碳措施碳监测实验室建设

在线全文

学校读者我要写书评

暂无评论

污泥生物炭对土壤养分及重金属的影响

应用化工 2024年第5期53卷 1098-1103,1108页

作者：白雪叶丽红马岚张铁坚刘俊良河北农业大学城乡建设学院河北保定071000

采用未、酸、碱改性污泥生物炭(SC1、SC2、SC3)修复受重金属单一污染(Cu、Zn、Cd)的土壤,研究生物炭对土壤理化性质、养分指标及重金属形态分布的影响。结果表明,施加三种SC后,土壤pH值与电导率均显著增加;阳离子交换量、有机质、有效... 详细信息

采用未、酸、碱改性污泥生物炭(SC1、SC2、SC3)修复受重金属单一污染(Cu、Zn、Cd)的土壤,研究生物炭对土壤理化性质、养分指标及重金属形态分布的影响。结果表明,施加三种SC后,土壤pH值与电导率均显著增加;阳离子交换量、有机质、有效磷及速效钾等养分指标也均呈现积极影响,即阳离子交换量在SC3的处理下提升效果更好,有机质与有效磷含量在SC2的处理下增加更为显著,速效钾含量的提升均在50%左右;三种重金属则在SC3的处理下修复固化效果更好。

关键词：污泥生物炭重金属土壤养分形态分布

Study on Mutations in ALS for Resistance to Tribenuron-Methyl in Galium aparine L.

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2011年第1期10卷 86-91页

作者： SUN Jian WANG Jin-xin ZHANG Hong-jun liu jun-liang BIAN Sheng-nan College of Plant Protection Shandong Agricultural University Tai＇an 271018 PR.China Institute for the Control of Agrochemicals Ministry of Agriculture Beijing 100125 P.R.China

In recent years, Galium aparine L. has not been controlled by tribenuron-methyl in major Chinese winter wheat fields. The objective of this study is to understand the molecular basis of the resistance mechanism to tribenuron-methyl in G. aparine and to find the specific mutation sites in amino acid sequence of acetolactate synthase （ALS） in the resistant biotype of G. aparine. Fragments that encode the ALS were amplified and cloned from susceptible （S） and resistant （R） biotypes of G. aparine to tribenuron-methyl and sequenced subsequently. The result showed that the nucleotide sequence of Rbiotype of G. aparine differed from that of the S biotype with three amino acid substitutions, of which, the amino acid substitution of Trp57-4 （TGG） to Gly （GGG） is located in the highly conserved region Domain B. The substitution of Trp574 might be responsible for the resistance to tribenuron-methyl in the R-biotype of G. aparine.

关键词： resistance Galium aparine L. acetolactate synthase gene mutation

Polyethylene glycol (PEG) as a benign solvent for Knoevenagel condensation

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第9期19卷 1043-1046页

作者： Yang liu jun liang Xiu Hong liu Ji Cai Fan Zhi Cai Shang Department of Chemistry Zhejiang University Hangzhou 310027 China

The Knoevenagel condensation of aromatic aldehydes with active methylene compound proceeded efficiently in polyethylene glycol at room temperature with L-proline as catalyst. The yield is high and the products had E-isomer dominantly. Polyethylene glycol containing L-proline could be recycled and reused for several times without noticeably decreasing in productivity.

关键词： Polyethylene glycol L-Proline Knoevenagel condensation

Effects of Twin-Dislocation and Twin-Twin Interactions on the Strain Hardening Behavior of TWIP Steels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2010年第12期17卷 70-74页

作者： WANG Shu-han liu Zhen-yu WANG Guo-dong liu jun-liang liang Gao-fei LI Qiu-lin Graduate School at Shenzhen Tsinghua University Shenzhen 518055 Guangdong China The Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110004 Liaoning China The Research and Development Institute Baosteel Co Ltd Shanghai 201900 China

Tensile tests of Fe-30Mn-5Si-2Al steel were carried out for different strains of 0.05, 0.14, 0.26, and up to the strain-to-failure in order to observe the evolution of microstructure during deformation and investigating the strain hardening behavior. Three-stage strain hardening behavior was observed in this steel during tensile test. In stage I , planar dislocation structure was observed by TEM and regarded as main deformation mechanism, and low strain hardening rate exponent was exhibited. Primary deformation twinning occurred in stage II , and the strain hardening rate exponent increased due to the blockage of dislocations＇ motion by twin boundaries. In stage III , the strain hardening rate exponent had increased to a value higher than 0.5. The obstacle effect of twin boundaries and twin-twin interact＇ion had been observed by TEM, and the interactions between primary and secondary twins were found to cause the additional hardening in addition to the obstacle effect on dislocations＇ motion, which led to the twinning induced plasticity effect in the later stage of deformation.

关键词： TWIP steel strain hardening twin dislocation

在线全文

学校读者我要写书评

暂无评论

基于高速ADC的数字双混频时差测量系统

时间频率学报 2024年第1期47卷 34-45页

作者：冷杰兴刘军良刘倩王莹徐超胡永辉中国科学院国家授时中心西安710600 中国科学院大学北京100049

使用双混频时差法进行时间和频率测量时,模拟部分引入的噪声会干扰信号过零点的判断,降低测量精度,而使用数字信号处理技术后不再需要判断过零点,量化噪声成为系统内的主要噪声来源,可以通过数字滤波器对其进行抑制。同时有利于设计结... 详细信息

使用双混频时差法进行时间和频率测量时,模拟部分引入的噪声会干扰信号过零点的判断,降低测量精度,而使用数字信号处理技术后不再需要判断过零点,量化噪声成为系统内的主要噪声来源,可以通过数字滤波器对其进行抑制。同时有利于设计结构紧凑的系统,更易于小型化,测量速度也可以进行灵活配置。通过引入高速模数转换器、数控振荡器、低通抽取滤波器、数字鉴相器等,设计了数字双混频时差测量系统,并研制了4通道的原理样机。测试结果表明,当频率源为10 MHz的信号时,原理样机中属于同片ADC(analog-to-digital converter)的两个通道间的本底噪声约为5×10^(-14)@1 s,属于不同片ADC的两个通道间的本底噪声约为8×10^(-14)@1 s,满足原子振荡器的测量要求。并以主动型氢钟VCH-1003M为参考,使用原理样机分别对Microchip的5071A铯原子钟和SRS的FS725铷原子钟的稳定度进行测量,测量结果与Microchip的相噪分析仪53100A和5120A无显著差异。

关键词：双混频时差模数转换器低通抽取滤波器本底噪声

Transient state analysis of a rub-impact rotor system during maneuvering flight

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第7期37卷 236-251页

作者： jun WANG Yunfei liu Zhaoye QIN liang MA Fulei CHU Beijing Key Laboratory of Health Monitoring and Self-Recovery for High-End Machinery Equipment Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China College of Aeronautical Engineering Civil Aviation University of ChinaTianjin 300300China

Maneuvering flight substantially affects the dynamic behavior of rotors;particularly,such flight may cause rubbing between a rotor and stator,which is one of the most serious damages in aircraft *** this paper,a nonlinear dynamic model for describing the dynamic characteristics of a rub-impact rotor system during maneuvering flight is established based on the Lagrange ***,numerical simulations employing the Newmark method are performed,delving into the detailed discussion of the influence of parameters such as rotational speed and maneuvering flight on the transient and steady-state responses of the rotor *** effect mechanism of maneuver load and its coupling with rub impact is *** results show that the impact response induced by maneuvering flight is more obvious in the subcritical state than in the supercritical *** additional stiffness and damping are also induced;in particular,the additional damping has a coupling ***,the rub impact imposes an additional constraint on the rotor system,thereby weakening the influence of the maneuver load and becoming the major factor that determines the dynamic behavior of the rotor system at high speeds.

关键词： Maneuvering flight Rub impact Rotor system Dynamic response Impact response

Experiment study of forming and activation of conductive film of the surface conduction electron emitter display

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2007年第1期3卷 54-56页

作者： LEI Xin XU Wei-jun liu Chun-liang liang Zhi-hu Key Laboratory for Physical Electronics and Devices of the Ministry of Education of China Xi＇ an Jiaotong University Xi＇ an 710049 China

The forming and activation of the conductive films are studied experimentally. The power supply, a peak-to-peak 30 V triangle profile voltage, is applied to three kinds of conductive films that contain 0.25%, 0.5%, and 1% of palladium respectively. In the experiments we contrasted the values of related parameter in different conditions, observed the lumi- nous spots on the anode panel, dealt with and analyzed the related data, and compared the positions and the amount of the luminous spots. We have gotten the conclusion that there is a threshold value Uth. The emission current Ie will increase rapidly when the device voltage Uf is greater than Uth. And the emission current Ie could be controlled by the device voltage Uf. The positions of the luminous spots on the anode panel are related with the device voltage Uf.

关键词：表面传导电子发射显示传导膜形成活化实验研究钯

Resilient Smart Power Grid Synchronization Estimation Method for System Resilience with Partial Missing Measurements

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第3期10卷 1307-1319页

作者： Yi Wang Yanxin liu Mingdong Wang Venkata Dinavahi jun liang Yonghui Sun School of Electrical and Information Engineering Zhengzhou UniversityZhengzhou 450001China Henan Engineering Research Center of Power Electronics and Energy Systems Zhengzhou 450001China Department of Electrical and Computer Engineering University of AlbertaEdmontonAB T6G 2V4Canada School of Engineering Cardiff UniversityCardiff CF243AAUK College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China IEEE

With the increasing demand for power system stability and resilience,effective real-time tracking plays a crucial role in smart grid ***,most studies have focused on measurement noise,while they seldom think about the problem of measurement data loss in smart power grid *** solve this problem,a resilient fault-tolerant extended Kalman filter(RFTEKF)is proposed to track voltage amplitude,voltage phase angle and frequency ***,a threephase unbalanced network’s positive sequence fast estimation model is ***,the loss phenomenon of measurements occurs randomly,and the randomness of data loss’s randomness is defined by discrete interval distribution[0,1].Subsequently,a resilient fault-tolerant extended Kalman filter based on the real-time estimation framework is designed using the timestamp technique to acquire partial data loss ***,extensive simulation results manifest the proposed RFTEKF can synchronize the smart grid more effectively than the traditional extended Kalman filter(EKF).

关键词： Dynamic state estimation Kalman filter partial missing measurements power systems smart grid synchronized measurements