The nitrogen (N) metabolic experiments were made to estimate separately amino acid requirements of 4348 weeks old layers for maintenance, for protein accretion to estabolish models to estimate digestible amino acid re...The nitrogen (N) metabolic experiments were made to estimate separately amino acid requirements of 4348 weeks old layers for maintenance, for protein accretion to estabolish models to estimate digestible amino acid requirements. The regression relationship of nitrogen retention vs amino acid intake was estimated for each amino acid by giving, at rate of N intake of 091, 052, 015 and 0007gkg-1 body-weight (W075) per d, the semi-synthetic diets was made specially deficient in one amino acid. From the regression coefficients, it was calculated that, for the accretion of 1 g protein, the dietary digestible amino acid requirements were (mg) Thr 631, Val 1004, Met 399, Ile 886, Leu 1143, Phe 632, Lys 870, His 205, Arg 879, Trp 214, Met+Cys 776, and Phe+Tyr 1143. Daily amino acid requirements for N equilibrium were estimated to be (mgkg-1W075 per day) Thr 506, Val 747, Met 303, ILe 667 Leu 814, Phe 448, Lys 605 His 147, Arg 739 ,Trp 173, Met+Cys 586, and Phe+Tyr 839 The dietary degestible amino acid patterns for protein accretion and N equilibrium were also proposed. The models of estimating digestible amino acid requirements for the different productions were developed.展开更多
Exploiting the potentials of urban stock land and its intensive use have been widespread concerned, however the practical solutions are few,especially in the view of engineering.Basing on synthesizing and analysis of ...Exploiting the potentials of urban stock land and its intensive use have been widespread concerned, however the practical solutions are few,especially in the view of engineering.Basing on synthesizing and analysis of the traditional models,this paper introduces the concept of urban renewal pattern for land saving.A double-layer city model was proposed, following with calculation of land saving of展开更多
烟草分层采收机在丘陵山区作业时,由于机身倾斜影响采收质量,并存在倾翻风险。本文设计了一种基于水平连杆机构的门架式履带烟草采收机调姿底盘,实现了在不同倾斜作业场景下的姿态调整。本文提出了门架式履带调姿底盘的水平连杆姿态方案...烟草分层采收机在丘陵山区作业时,由于机身倾斜影响采收质量,并存在倾翻风险。本文设计了一种基于水平连杆机构的门架式履带烟草采收机调姿底盘,实现了在不同倾斜作业场景下的姿态调整。本文提出了门架式履带调姿底盘的水平连杆姿态方案,并对横向调姿机构的各部件参数进行设计分析;建立了以Arduino Uno R3为控制核心的姿态调整控制系统,采用左右逐低法自动调平控制逻辑保证车身重心保持在较低位置。姿态调整试验表明,采收机底盘横向姿态调整角≥7°达到了采收机倾斜地块作业要求,研究工作为丘陵山地烟草采收机械化生产提供了技术支持。展开更多
Transformers are key components in substations,and their maintenance scheme is very important.Optimizing the transformer maintenance scheme can enhance substation reliability and lower maintenance cost.Current resolut...Transformers are key components in substations,and their maintenance scheme is very important.Optimizing the transformer maintenance scheme can enhance substation reliability and lower maintenance cost.Current resolutions focus on device state evaluation and fault detection,which is ex-post method.However,this paper proposes a LS-SVM algorithm based on deficiencies tree analysis to predict deficiencies in future under certain maintenance scheme,then choose the best maintenance scheme.展开更多
文摘The nitrogen (N) metabolic experiments were made to estimate separately amino acid requirements of 4348 weeks old layers for maintenance, for protein accretion to estabolish models to estimate digestible amino acid requirements. The regression relationship of nitrogen retention vs amino acid intake was estimated for each amino acid by giving, at rate of N intake of 091, 052, 015 and 0007gkg-1 body-weight (W075) per d, the semi-synthetic diets was made specially deficient in one amino acid. From the regression coefficients, it was calculated that, for the accretion of 1 g protein, the dietary digestible amino acid requirements were (mg) Thr 631, Val 1004, Met 399, Ile 886, Leu 1143, Phe 632, Lys 870, His 205, Arg 879, Trp 214, Met+Cys 776, and Phe+Tyr 1143. Daily amino acid requirements for N equilibrium were estimated to be (mgkg-1W075 per day) Thr 506, Val 747, Met 303, ILe 667 Leu 814, Phe 448, Lys 605 His 147, Arg 739 ,Trp 173, Met+Cys 586, and Phe+Tyr 839 The dietary degestible amino acid patterns for protein accretion and N equilibrium were also proposed. The models of estimating digestible amino acid requirements for the different productions were developed.
文摘Exploiting the potentials of urban stock land and its intensive use have been widespread concerned, however the practical solutions are few,especially in the view of engineering.Basing on synthesizing and analysis of the traditional models,this paper introduces the concept of urban renewal pattern for land saving.A double-layer city model was proposed, following with calculation of land saving of
文摘烟草分层采收机在丘陵山区作业时,由于机身倾斜影响采收质量,并存在倾翻风险。本文设计了一种基于水平连杆机构的门架式履带烟草采收机调姿底盘,实现了在不同倾斜作业场景下的姿态调整。本文提出了门架式履带调姿底盘的水平连杆姿态方案,并对横向调姿机构的各部件参数进行设计分析;建立了以Arduino Uno R3为控制核心的姿态调整控制系统,采用左右逐低法自动调平控制逻辑保证车身重心保持在较低位置。姿态调整试验表明,采收机底盘横向姿态调整角≥7°达到了采收机倾斜地块作业要求,研究工作为丘陵山地烟草采收机械化生产提供了技术支持。
文摘Transformers are key components in substations,and their maintenance scheme is very important.Optimizing the transformer maintenance scheme can enhance substation reliability and lower maintenance cost.Current resolutions focus on device state evaluation and fault detection,which is ex-post method.However,this paper proposes a LS-SVM algorithm based on deficiencies tree analysis to predict deficiencies in future under certain maintenance scheme,then choose the best maintenance scheme.
