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采油井石油产量多路循环计量系统
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作者 王俊松 董锦旗 +1 位作者 周媛 储健 《仪器仪表学报》 EI CAS CSCD 北大核心 2005年第z2期201-202,205,共3页
基于单片机设计了采油井石油产量的多路循环计量系统,阐述了该系统的计量原理及工艺过程,给出了计量系统的软、硬件设计。该系统提高了采油井石油产量计量的精度,实现了油井的精细化管理,同时为对整个油田的计算机信息化管理奠定了基础。
关键词 单片机 石油 循环计量
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多个具有非零均值复乘性噪声的复谐波信号循环估计量的性能分析 被引量:2
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作者 毛用才 保铮 《电子科学学刊》 CSCD 1999年第3期289-295,共7页
从雷达等探测系统需要的频率估计出发,文中研究了利用循环平稳方法估计多个具有非零均值随机乘性噪声的复谐波信号参数的方法,并分析了其渐近统计性能,结果表明循环均值可用来恢复多个具有任意分布的非零均值有色乘性噪声的复谐波信号,... 从雷达等探测系统需要的频率估计出发,文中研究了利用循环平稳方法估计多个具有非零均值随机乘性噪声的复谐波信号参数的方法,并分析了其渐近统计性能,结果表明循环均值可用来恢复多个具有任意分布的非零均值有色乘性噪声的复谐波信号,且所得的谐波参数估计的均方差与相应的Cramer-Rao界具有相同的数量级。模拟结果验证了所得结果的正确性。 展开更多
关键词 循环计量 乘性随机噪声 谐波恢复 信号处理
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多个具有零均值复乘性噪声复谐波信号的循环估计量的性能分析 被引量:1
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作者 毛用才 保铮 《电子科学学刊》 CSCD 1999年第4期482-487,共6页
文中研究了利用循环平稳方法估计多个具有零均值随机乘性噪声的复谐波信号参数的方法,并分析了其渐近统计性能,结果表明循环统计量可用来恢复多个具有任意分布的零均值随机有色乘性噪声的复谐波信号,且所得的谐波参数估计的均方差与相应... 文中研究了利用循环平稳方法估计多个具有零均值随机乘性噪声的复谐波信号参数的方法,并分析了其渐近统计性能,结果表明循环统计量可用来恢复多个具有任意分布的零均值随机有色乘性噪声的复谐波信号,且所得的谐波参数估计的均方差与相应的Cramer-Rao界具有相同的数量级。模拟结果验证了所得结果的正确性。 展开更多
关键词 循环计量 乘性随机噪声 谐波恢复 信号分析
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复非零均值乘性和复加性噪声中复谐波的循环估计量性能分析
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作者 毛用才 保铮 《西安电子科技大学学报》 EI CAS CSCD 北大核心 1997年第A00期162-167,共6页
从通信和探测系统需要的频率估计出发,文中研究了复值乘性与复值加性随机噪声中复谐波的恢复问题,表明循环均值可用在有色的且具有任意分布的复值乘性与复值加性随机噪声中进行谐波的恢复.对于非零均值乘性噪声情形分析了循环估计量的性... 从通信和探测系统需要的频率估计出发,文中研究了复值乘性与复值加性随机噪声中复谐波的恢复问题,表明循环均值可用在有色的且具有任意分布的复值乘性与复值加性随机噪声中进行谐波的恢复.对于非零均值乘性噪声情形分析了循环估计量的性能,证明了循环估计量与一定意义下的最小二乘估计量渐近等价,并给出了循环估计量的大样本方差表达式.模拟结果验证了大样本的性能分析. 展开更多
关键词 循环计量 性能分析 乘性随机噪声 雷达
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乘性和复加性噪声中复谐波的循环估计量的性能分析
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作者 毛用才 保铮 《电子科学学刊》 CSCD 1997年第6期773-779,共7页
从通信和探测系统需要的频率估计出发,文中研究了实乘性和复加性随机噪声中复谐波的恢复问题,表明循环均值和循环相关函数可用来对不同分布的有色实乘性和复加性随机噪声中的谐波进行恢复,分别对于非零均值和零均值乘性噪声情形分析了... 从通信和探测系统需要的频率估计出发,文中研究了实乘性和复加性随机噪声中复谐波的恢复问题,表明循环均值和循环相关函数可用来对不同分布的有色实乘性和复加性随机噪声中的谐波进行恢复,分别对于非零均值和零均值乘性噪声情形分析了循环估计量的性能.证明了循环估计量与一定意义下的最小二乘估计量渐近等价,并给出了循环估计量的大样本方差表达式.模拟结果验证了大样本性能分析. 展开更多
关键词 循环计量 随机噪声 信号处理
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集团内交叉持股投资收益的计量 被引量:2
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作者 彭正辉 刘雪华 《财会月刊》 北大核心 2015年第6期55-57,共3页
集团内交叉持股衍生的投资收益计量问题已成为财务报表编制的难题,并随着企业会计准则的修订而呈现新的特征。本文从个别财务报表与合并财务报表两个层面,探讨集团内交叉持股投资收益计量的主要特点,并对其衍生的财务问题提出了改进措施。
关键词 企业集团 交叉持股 投资收益 循环计量
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散料连续累加秤
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《粮油加工与食品机械》 北大核心 2005年第10期40-40,共1页
由哈尔滨杰曼机电设备有限公司生产的GM301—10-Q1型散料连续累加秤适用于粮食仓储、粮食加工、饲料加工、港口码头等原料的计量。每个型号均有固定式和移动式两种结构。
关键词 散料连续累加秤 单斗循环计量静态称重 计量精度 全气动控制 打印机接口
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优化分级T-S模糊控制动态估计纯电动汽车电池健康状态 被引量:6
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作者 陈德海 华铭 +1 位作者 邹争明 任永昌 《北京理工大学学报》 EI CAS CSCD 北大核心 2019年第6期609-614,共6页
针对纯电动汽车动力电池健康状态(state of health,SOH)预测中非线性影响因素多、算法繁杂、难以在单片机开发平台中实现等难点,首先利用累计充电循环次数计量法得到使用循环次数,将SOH与使用循环次数、内阻变化量、电压降值的相关非线... 针对纯电动汽车动力电池健康状态(state of health,SOH)预测中非线性影响因素多、算法繁杂、难以在单片机开发平台中实现等难点,首先利用累计充电循环次数计量法得到使用循环次数,将SOH与使用循环次数、内阻变化量、电压降值的相关非线性关系转换成离散的二维数据表,依据使用条件,采用二分查表法获得不同估计方法下SOH值;再将使用循环次数、电压降值和内阻变化量作为输入量,以相应SOH的权重作为输出,利用T-S模糊控制建立SOH动态预测模型,根据权重和边界条件计算得到SOH.仿真结果表明,所提方法最大预测误差4.3%,响应时间55ms内,预测效果比现有方法显著提高. 展开更多
关键词 SOH 累计充电循环次数计量 二分查表法 T-S模糊控制 动态模型
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Non-invasive measurement of pan-colonic pressure over a whole digestive cycle:Clinical applications of a capsule-style manometric system 被引量:1
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作者 Wen-Qiang Zhang Guo-Zheng Yan +1 位作者 Lian-Zhi Yu xin-Qing Yang 《World Journal of Gastroenterology》 SCIE CAS CSCD 2006年第47期7690-7694,共5页
AIM: To study the prolonged colonic motility under normal conditions with a novel capsule-style microsystem and to assess its clinical significance. METHODS: A single use telemetry capsule (10 mm in diameter, 20 mm... AIM: To study the prolonged colonic motility under normal conditions with a novel capsule-style microsystem and to assess its clinical significance. METHODS: A single use telemetry capsule (10 mm in diameter, 20 mm in length) embedded with a pressure sensor was ingested by the subjects. The sensor is capable of transmitting colonic pressure wirelessly for more than 130 h. The time of capsule entering the segmental colon was detected by ultrasound. The ultrasonic electrodes were mounted on the surface of the ileocecum and navel and at the junction of the left and rectosigmoid colon of the subjects in sequence, which were identified by abdominal X-rays with radiopaque markers. To verify the accuracy and reliability of ultrasonic detection of telemetry capsules at key points of colon, the segmental colonic transit time was simultaneously recorded by using radiopaque markers. RESULTS: The signal lamp showed that all recorders could receive the radio signal transmitted by the telemetry capsule. The X-rays showed that all telemetry capsules were detected successfully when they were passing through the key points of colon. There was a significant correlation between the transit results obtained by ultrasonic detection or by radiopaque markers. Colorectal recording was obtained from 20 healthy subjects during 613 h (411 h during waking, 202 h during sleep). Compared to waking, the number of pressure contractions and the area under pressure contractions were significantly (P 〈 0.05) decreased during sleep (21 ± 5 h^-vs 15 ± 4 h1, 463 ± 54 mmHg·/min vs 342 ± 45 mmHg·/min). The colonic motility exhibited significant regional variations both in the circadian behavior and in response to waking and meal. CONCLUSION: The capsule-style micro-system is reliable and noninvasive, and may represent a useful tool for the study of physiology and pathology of colonic motor disorders. 展开更多
关键词 Colon Pan-colonic pressure Pan-colonic motor activity Telemetry
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Controlled Entropy and Gauge Theory in Recycling Condensed Matter by Solar Energy
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作者 Nilo Sylvio Costa Serpa 《Journal of Physical Science and Application》 2017年第6期6-14,共9页
This article discusses the physical principles to be considered in a thermodynamic engineering solar system running under operational control algorithms designed to minimize entropy rates. The proposed plant is based ... This article discusses the physical principles to be considered in a thermodynamic engineering solar system running under operational control algorithms designed to minimize entropy rates. The proposed plant is based on scientific foundations established by thermodynamics and classical field theory, and empirical disciplines that deal with properties of chemical elements and with technologies of calorific capture from remote sources. The gauge principle was applied in theoretical formalization as an essential tool in the control background of the entropy rates involved. The industrial system presented was planned to recycle condensed matter within the scope of a solid waste management policy. 展开更多
关键词 Waste THERMODYNAMICS gauge principle PYROLYSIS solar energy cleaner production
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Can the scaling of plant nitrogen to phosphorus be altered by global change? An empirical test
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作者 Min Long Juanjuan Zhang +6 位作者 Zhengyi Liu Luyao Zhou Fanglong Su Rui Xiao Yi Wang Hui Guo Shuijin Hu 《Journal of Plant Ecology》 SCIE CSCD 2020年第4期442-449,共8页
Aims Global change may cause unparalleled supplies of soil nutrients and further lead to stoichiometric imbalance of nitrogen(N)and phosphorus(P)in terrestrial plants.While previous studies had reported the effects of... Aims Global change may cause unparalleled supplies of soil nutrients and further lead to stoichiometric imbalance of nitrogen(N)and phosphorus(P)in terrestrial plants.While previous studies had reported the effects of global change factors on plant N,P contents and their ratios,few had examined whether or how these factors may influence the scaling of these two elements.Methods Taking advantage of a manipulative experiment with altered precipitation,warming and N addition,and using the general scaling function N=βPα,we examined how the scaling of plant N to P may respond to global change factors in a Loess grassland in northwestern China.Important Findings We found that precipitation reduction(PR)and warming decreased plant P concentrations,while N addition increased plant N concentrations,resulting in increased N:P ratios.The slopes of the linear regressions between plant N and P(i.e.log-transformed N versus P)did not change significantly,whereas the intercepts increased significantly under PR,warming and N addition.These results indicate that global change factors may not affect the synergistic variation of plant N and P,showing a closely coupled relationship between them.Our findings may help to better understand plant nutrient dynamics and element balance in a changing world. 展开更多
关键词 climate change element coupling N addition nutrient cycling STOICHIOMETRY
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Experimental warming shifts coupling of carbon and nitrogen cycles in an alpine meadow
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作者 Song Wang Quan Quan +3 位作者 Cheng Meng Weinan Chen Yiqi Luo Shuli Niu 《Journal of Plant Ecology》 SCIE CSCD 2021年第3期541-554,共14页
Aims Terrestrial ecosystem carbon(C)uptake is remarkably regulated by nitrogen(N)availability in the soil.However,the coupling of C and N cycles,as reflected by C:N ratios in different components,has not been well exp... Aims Terrestrial ecosystem carbon(C)uptake is remarkably regulated by nitrogen(N)availability in the soil.However,the coupling of C and N cycles,as reflected by C:N ratios in different components,has not been well explored in response to climate change.Methods Here,we applied a data assimilation approach to assimilate 14 datasets collected from a warming experiment in an alpine meadow in China into a grassland ecosystem model.We attempted to evaluate how experimental warming affects C and N coupling as indicated by constrained parameters under ambient and warming treatments separately.Important Findings The results showed that warming increased soil N availability with decreased C:N ratio in soil labile C pool,leading to an increase in N uptake by plants.Nonetheless,C input to leaf increased more than N,leading to an increase and a decrease in the C:N ratio in leaf and root,respectively.Litter C:N ratio was decreased due to the increased N immobilization under high soil N availability or warming-accelerated decomposition of litter mass.Warming also increased C:N ratio of slow soil organic matter pool,suggesting a greater soil C sequestration potential.As most models usually use a fixed C:N ratio across different environments,the divergent shifts of C:N ratios under climate warming detected in this study could provide a useful benchmark for model parameterization and benefit models to predict C-N coupled responses to future climate change. 展开更多
关键词 Bayesian probabilistic inversion Markov-Chain Monte-Carlo(MCMC) WARMING carbon and nitrogen cycles STOICHIOMETRY alpine meadow
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Optimization of parameters of Yi Zhi Chan Tuina manipulation promotes peripheral circulation 被引量:4
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作者 Fang Lei Fang Min +1 位作者 Jiang Shichao Chen Hua 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2015年第5期558-563,共6页
OBJECTIVE:To explore the most effective parameters of Yi Zhi Chan Tuina manipulation for improving peripheral blood circulation.METHODS:A total of 45 volunteers were recruited from Pudong district in Shanghai,China,fr... OBJECTIVE:To explore the most effective parameters of Yi Zhi Chan Tuina manipulation for improving peripheral blood circulation.METHODS:A total of 45 volunteers were recruited from Pudong district in Shanghai,China,from October to December 2010,and randomly divided into nine groups using computer-generated random numbers.Participants received Yi Zhi Chan Tuina manipulation on Chengjin(BL 56) acupoint;each group received a particular combination of manipulation force and treatment time.We used a two-factor,three-level factorial design to examine the effects of force and treatment time on changes in popliteal artery average volume flow,pulsatility index,and vessel diameter to determine the optimal parameter group.Outcomes were assessed at baseline and after Tuina manipulation by interviewers blind to treatment group status.RESULTS:After manipulation,two of the nine groups showed an increase in popliteal artery volume flow.An inter-participants effect test showed that for main effect of time,F = 0.331,P = 0.720;for main effect of force,F = 2.934,P = 0.066;and for the force-time interaction effect,F = 1.072,P = 0.385,indicating no interaction between force and time.However,a pairwise comparison of the three levels of time showed that a treatment time of 10 min was significantly more effective than that of 2 min(P = 0.024).A pairwise comparison of light force,medium force,and heavy force showed a statistically significant effect for medium force(P = 0.035).CONCLUSION:Yi Zhi Chan Tuina manipulation with vertical force of 9.31 N for 10 min is most effective in improving peripheral circulation. 展开更多
关键词 Yi Zhi Chan Tuina manipulation Regional blood flow Pulsatility index
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An Alternative Adiabatic Quantum Algorithm for the Hamiltonian Cycle Problem
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作者 张大剑 仝殿民 +1 位作者 陆遥 龙桂鲁 《Communications in Theoretical Physics》 SCIE CAS CSCD 2015年第5期554-558,共5页
We put forward an alternative quantum algorithm for finding ttamiltonian cycles in any N-vertex graph based on adiabatic quantum computing. With a yon Neumann measurement on the final state, one may determine whether ... We put forward an alternative quantum algorithm for finding ttamiltonian cycles in any N-vertex graph based on adiabatic quantum computing. With a yon Neumann measurement on the final state, one may determine whether there is a HamiRonian cycle in the graph and pick out a cycle if there is any. Although the proposed algorithm provides a quadratic speedup, it gives an alternative algorithm based on adiabatic quantum computation, which is of interest because of its inherent robustness. 展开更多
关键词 Iquantum algorithm Hamiltonian cycle problem adiabatic quantum computation
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