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Semi-definite programming based pulse waveform design and its further analysis 认领 引用
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作者 王利利 沙学军 吴宣利 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第4期578-581,共4页
In order to provide a judicious pulse waveform design required for ultra-wideband(UWB)communication to enable the UWB spectral mask compatible and coexistent with other existing wireless communication systems,a semi-d... In order to provide a judicious pulse waveform design required for ultra-wideband(UWB)communication to enable the UWB spectral mask compatible and coexistent with other existing wireless communication systems,a semi-definite programming(SDP)based pulse waveform design method for UWB radios is introduced and a further analysis is given in this paper.By using Sedumi and Yalmip toolboxes of Matlab,the procedure of solving the SDP problem is simplified.Simulation results show that this SDP based pulse waveform design method can be used to design pulses that fulfill the Federal Communications Commission(FCC)spectral mask strictly and optimize the power efficiency at the same time.This paper also analyzes the influences of the power efficiency duing to the changes of sampling interval and the number of combined pulses,and then the optimal sampling interval that maximizes the transmission power can be found. 展开更多
关键词 ultra-wideband pulse waveform design FCC spectral mask semi-definite programming
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Programmed cell death induced by modified clay in controlling Prorocentrum donghaiense bloom 认领 引用 被引量：1
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作者 Hena Ji Zhiming Yu +3 位作者 Liyan He Jianan Zhu Xihua Cao Xiuxian Song 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2021年第11期123-134,共12页
Modified clay(MC),an effective material used for the emergency elimination of algal blooms,can rapidly reduce the biomass of harmful algal blooms(HABs)via flocculation.After that,MC can still control bloom population ... Modified clay(MC),an effective material used for the emergency elimination of algal blooms,can rapidly reduce the biomass of harmful algal blooms(HABs)via flocculation.After that,MC can still control bloom population through indirect effects such as oxidative stress,whichwas initially proposed to be related to programmedcell death(PCD)at molecular level.To further study theMC induced cell death in residual bloom organisms,especially identifying PCD process,we studied the physiological state of the residual Prorocentrum donghaiense.The experimental results showed that flocculation changed the physiological state of the residual cells,as evidenced by growth inhibition and increased reactive oxygen species production.Moreover,this research provides biochemical and ultrastructural evidence showing that MC induces PCD in P.donghaiense.Nuclear changes were observed,and increased caspase-like activity,externalization of phosphatidylserine and DNA fragmentation were detected in MC-treated groups and quantified.And the mitochondrial apoptosis pathway was activated in both MC-treated groups.Besides,the features of MC-induced PCD in a unicellular organism were summarized and its concentration dependent manner was proved.All our preliminary results elucidate the mechanism through which MC can further control HABs by inducing PCD and suggest a promising application of PCD in bloom control. 展开更多
关键词 Modified clay Prorocentrum donghaiense Programmed cell death Harmful algal blooms
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A Modified Lagrange Method for Solving Convex Quadratic Optimization Problems 认领 引用
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作者 Twum B. Stephen Avoka John Christian J. Etwire 《Open Journal of Optimization》 2024年第1期1-20,共20页
In this paper, a modified version of the Classical Lagrange Multiplier method is developed for convex quadratic optimization problems. The method, which is evolved from the first order derivative test for optimality o... In this paper, a modified version of the Classical Lagrange Multiplier method is developed for convex quadratic optimization problems. The method, which is evolved from the first order derivative test for optimality of the Lagrangian function with respect to the primary variables of the problem, decomposes the solution process into two independent ones, in which the primary variables are solved for independently, and then the secondary variables, which are the Lagrange multipliers, are solved for, afterward. This is an innovation that leads to solving independently two simpler systems of equations involving the primary variables only, on one hand, and the secondary ones on the other. Solutions obtained for small sized problems (as preliminary test of the method) demonstrate that the new method is generally effective in producing the required solutions. 展开更多
关键词 Quadratic Programming Lagrangian Function Lagrange Multipliers Optimality Conditions Subsidiary Equations Modified Lagrange Method
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Inner Product Laplacian Embedding Based on Semidefinite Programming 认领 引用
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作者 Xianhua Zeng 《Journal of Signal and Information Processing》 2011年第3期196-204,共9页
This paper proposes an inner product Laplacian embedding algorithm based on semi-definite programming, named as IPLE algorithm. The new algorithm learns a geodesic distance-based kernel matrix by using semi-definite p... This paper proposes an inner product Laplacian embedding algorithm based on semi-definite programming, named as IPLE algorithm. The new algorithm learns a geodesic distance-based kernel matrix by using semi-definite programming under the constraints of local contraction. The criterion function is to make the neighborhood points on manifold as close as possible while the geodesic distances between those distant points are preserved. The IPLE algorithm sufficiently integrates the advantages of LE, ISOMAP and MVU algorithms. The comparison experiments on two image datasets from COIL-20 images and USPS handwritten digit images are performed by applying LE, ISOMAP, MVU and the proposed IPLE. Experimental results show that the intrinsic low-dimensional coordinates obtained by our algorithm preserve more information according to the fraction of the dominant eigenvalues and can obtain the better comprehensive performance in clustering and manifold structure. 展开更多
关键词 Inner Product Semi-Definite Programming Geodesic Distance Laplacian Matrix
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改良版高血压延伸处方服务方案对单中心社区高血压患者治疗满意度和依从性的干预效果分析 认领 引用
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作者 方琴 陈浩 +2 位作者 张秋增 鞠秀丽 陶怡然 《复旦学报（医学版）》 CAS CSCD 北大核心 2026年第1期113-116,126,共4页
为评估改良版高血压延伸处方服务方案对社区高血压患者的干预效果,纳入2023年9—12月期间在上海市浦东新区六灶社区卫生服务中心签约家庭医生的高血压患者202例,采用自身前后对照的干预研究设计。患者平均年龄为(70.78±10.94)岁,... 为评估改良版高血压延伸处方服务方案对社区高血压患者的干预效果,纳入2023年9—12月期间在上海市浦东新区六灶社区卫生服务中心签约家庭医生的高血压患者202例,采用自身前后对照的干预研究设计。患者平均年龄为(70.78±10.94)岁,给予改良版高血压延伸处方服务方案干预并持续6个月,比较干预前后患者的主观满意度(通过自制问卷评估)、服药满意度(通过药物治疗满意度量表第二版评估)、服药依从性(通过服药依从性量表评估)及血压(收缩压和舒张压)变化。实施干预方案后,患者的主观满意度各条目均显著提高;药物治疗满意度量表在有效性、不良反应、整体满意度及总分维度得分均显著增加,而便利性维度得分变化不显著;服药依从性量表总分变化不显著;患者的收缩压[(139.54±14.18)mmHg vs.(132.00±8.90)mmHg,P<0.001]和舒张压[(80.81±6.88)mmHg vs.(77.28±7.32)mmHg,P<0.001]均显著下降。初步证明改良版高血压延伸处方服务方案改善了社区高血压患者的血压,其长期效果值得关注。 展开更多
关键词 社区高血压延伸处方服务 改良版方案 服药满意度 服药依从性
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NONLINEAR LAGRANGIANS FOR NONLINEAR PROGRAMMING BASED ON MODIFIED FISCHER-BURMEISTER NCP FUNCTIONS 认领 引用
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作者 Yonghong Ren Fangfang Guo Yang Li 《Journal of Computational Mathematics》 SCIE CSCD 2015年第4期396-414,共19页
This paper proposes nonlinear Lagrangians based on modified Fischer-Burmeister NCP functions for solving nonlinear programming problems with inequality constraints. The convergence theorem shows that the sequence of p... This paper proposes nonlinear Lagrangians based on modified Fischer-Burmeister NCP functions for solving nonlinear programming problems with inequality constraints. The convergence theorem shows that the sequence of points generated by this nonlinear La- grange algorithm is locally convergent when the penalty parameter is less than a threshold under a set of suitable conditions on problem functions, and the error bound of solution, depending on the penalty parameter, is also established. It is shown that the condition number of the nonlinear Lagrangian Hessian at the optimal solution is proportional to the controlling penalty parameter. Moreover, the paper develops the dual algorithm associ- ated with the proposed nonlinear Lagrangians. Numerical results reported suggest that the dual algorithm based on proposed nonlinear Lagrangians is effective for solving some nonlinear optimization problems. 展开更多
关键词 nonlinear Lagrangian nonlinear Programming modified Fischer-BurmeisterNCP function dual algorithm condition number
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基体改进剂和升温程序对石墨炉原子吸收法测土壤镉的影响 认领 引用
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作者 夏丽星 成锋 +2 位作者 朱娟 吴剑 冯琼杰 《广东化工》 CAS 2026年第10期37-40,共4页
采用盐酸-硝酸-氢氟酸-高氯酸全消解的方法对环标所和物化探所的土壤标准样品进行电热板消解,分析测试时通过改变石墨炉升温程序和是否添加基体改进剂从建立标准曲线、测定检出限、精密度和准确度等方式来探讨石墨炉原子吸收法测定土壤... 采用盐酸-硝酸-氢氟酸-高氯酸全消解的方法对环标所和物化探所的土壤标准样品进行电热板消解,分析测试时通过改变石墨炉升温程序和是否添加基体改进剂从建立标准曲线、测定检出限、精密度和准确度等方式来探讨石墨炉原子吸收法测定土壤镉含量中灰化温度、原子化温度及基体改进剂对测定结果的影响。实验结果表明:以0.2%磷酸氢二铵为基体改进剂,可增加基体的挥发性和提高镉元素的稳定性;灰化温度为450~650℃,原子化温度为1500~1650℃时,镉的质量浓度线性范围为0~2.5μg/L,线性、检出限、准确度和精密度均满足方法要求;加入基体改进剂对曲线斜率影响较大;使用仪器推荐的升温程序同时添加基体改进剂使标准土样结果更接近靶心;改变升温程序和是否添加基体改进剂均使测试相对标准偏差均不大,在0.9%~3.5%之间。 展开更多
关键词 土壤镉 电热板消解 石墨炉原子吸收光谱法 升温程序 基体改进剂
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石墨炉原子吸收分光光度法用于土壤中铅含量测定的优化研究 认领 引用
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作者 庄起帆 张建芳 +1 位作者 施兆悠 陈博 《天津科技》 2026年第2期41-44,共4页
采用3种不同的预处理方法,对比基体改进剂硝酸钯溶液与磷酸二氢铵溶液的处理效果,对铅的灰化温度和原子化温度进行优化,最终确定测定土壤中铅含量的最佳石墨炉升温程序。测定土壤中铅含量的最佳试验条件为:采用石墨消解法进行土壤预处理... 采用3种不同的预处理方法,对比基体改进剂硝酸钯溶液与磷酸二氢铵溶液的处理效果,对铅的灰化温度和原子化温度进行优化,最终确定测定土壤中铅含量的最佳石墨炉升温程序。测定土壤中铅含量的最佳试验条件为:采用石墨消解法进行土壤预处理,选择浓度为20μg/mL的硝酸钯溶液作为基体改进剂,并将石墨炉原子吸收分光光度计的灰化温度设定为850℃、原子化温度设定为1600℃。采用该方法测定土壤中铅含量,不仅快速、准确,而且稳定、可靠。 展开更多
关键词 预处理方法 石墨炉原子吸收分光光度法 基体改进剂 升温程序
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Thiamine-modified metabolic reprogramming of human pluripotent stem cell-derived cardiomyocyte under space microgravity 认领 引用 被引量：6
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作者 Xinglong Han Lina Qu +16 位作者 Miao Yu Lingqun Ye Liujia Shi Guangfu Ye Jingsi Yang Yaning Wang Hao Fan Yong Wang Yingjun Tan Chunyan Wang Qi Li Wei Lei Jianghai Chen Zhaoxia Liu Zhenya Shen Yinghui Li Shijun Hu 《Signal Transduction and Targeted Therapy》 SCIE CSCD 2024年第5期2132-2142,共11页
During spaceflight,the cardiovascular system undergoes remarkable adaptation to microgravity and faces the risk of cardiac remodeling.Therefore,the effects and mechanisms of microgravity on cardiac morphology,physiolo... During spaceflight,the cardiovascular system undergoes remarkable adaptation to microgravity and faces the risk of cardiac remodeling.Therefore,the effects and mechanisms of microgravity on cardiac morphology,physiology,metabolism,and cellular biology need to be further investigated.Since China started constructing the China Space Station(CSS)in 2021,we have taken advantage of the Shenzhou-13 capsule to send human pluripotent stem cell-derived cardiomyocytes(hPSC-CMs)to the Tianhe core module of the CSS.In this study,hPSC-CMs subjected to space microgravity showed decreased beating rate and abnormal intracellular calcium cycling.Metabolomic and transcriptomic analyses revealed a battery of metabolic remodeling of hPSC-CMs in spaceflight,especially thiamine metabolism.The microgravity condition blocked the thiamine intake in hPSC-CMs.The decline of thiamine utilization under microgravity or by its antagonistic analog amprolium affected the process of the tricarboxylic acid cycle.It decreased ATP production,which led to cytoskeletal remodeling and calcium homeostasis imbalance in hPSC-CMs.More importantly,in vitro and in vivo studies suggest that thiamine supplementation could reverse the adaptive changes induced by simulated microgravity.This study represents the first astrobiological study on the China Space Station and lays a solid foundation for further aerospace biomedical research.These data indicate that intervention of thiamine-modified metabolic reprogramming in human cardiomyocytes during spaceflight might be a feasible countermeasure against microgravity. 展开更多
关键词 programming battery modified
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Effects of Plasticizers,Antioxidants and Burning Rate Modifiers on Aging Performance of the HTPB/HMDI Composite Solid Propellant 认领 引用 被引量：1
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作者 Ahmed M Enew Ehab Abadir +1 位作者 Sahar Elmarsafy Karim K Elsharkawy 《含能材料》 EI CAS CSCD 北大核心 2019年第1期21-27,90,共7页
The effects of plasticizers,antioxidants and burning rate modifiers on the aging performance of the composite solid propellant based on hydroxyl-terminated polybutadiene(HTPB)/hexamethylene diisocyanate(HMDI)were expl... The effects of plasticizers,antioxidants and burning rate modifiers on the aging performance of the composite solid propellant based on hydroxyl-terminated polybutadiene(HTPB)/hexamethylene diisocyanate(HMDI)were explored by apply-ing an accelerated aging program for 90 day at 70 ℃. The HTPB propellant matrix with the diisooctyl sebacate(DOS)as plasti-cizers and diisooctyl azelate(DOZ), antioxidants as N,N ′-Diphenyl-p-phenylenediamine(AO) and 2,2′-methylenebis(4-methyl-6-tert-butylphenol)(cyanox 2246)and burning rate modifiers as barium ferrite(BF),copper chromites(CC)and fer-ric oxide(FO)were varied. Results show that sample(S1)which based on DOS decreases the stress value and increases the strain value which considered to be an excellent start for aging program. Sample(S3)containing AO presents the higher resis-tance to oxidation showing the better performance that reflects on increasing the shelf life of the composite solid propellant mo-tor. Sample(S5)which based on BF enhances the ballistic performance among over the other tested two samples. The accelerat-ed aging program allowed us to estimate the motor in-service lifetime. 展开更多
关键词 polybutadiene(HTPB)/hexamethylene diisocyanate(HMDI)composite solid propellant plasticizers antioxidants burning rate modifiers aging program
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THE PRIMAL-DUAL POTENTIAL REDUCTION ALGORITHM FOR POSITIVE SEMI-DEFINITE PROGRAMMING 认领 引用
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作者 Si-ming Huang 《Journal of Computational Mathematics》 SCIE EI 2003年第3期339-346,共8页
In this paper we introduce a primal-dual potential reduction algorithm for positive semi-definite programming. Using the symetric preserving scalings for both primal and dual interior matrices, we can construct an alg... In this paper we introduce a primal-dual potential reduction algorithm for positive semi-definite programming. Using the symetric preserving scalings for both primal and dual interior matrices, we can construct an algorithm which is very similar to the primal-dual potential reduction algorithm of Huang and Kortanek [6] for linear programming. The complexity of the algorithm is either O(nlog(X0 · S0/ε) or O(nlog(X0· S0/ε) depends on the value of ρ in the primal-dual potential function, where X0 and S0 is the initial interior matrices of the positive semi-definite programming. 展开更多
关键词 Positive semi-definite programming Potential reduction algorithms Complexity.
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Fuzzy Multi-Objective Semi-Definition Programming 认领 引用 被引量：1
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作者 Rui LIU Ke Cun ZHANG 《Journal of Mathematical Research and Exposition》 2010年第4期599-609,共11页
This paper first applies the fuzzy set theory to multi-objective semi-definite program-ming （MSDP）, and proposes the fuzzy multi-objective semi-definite programming （FMSDP） model whose optimal efficient solution i... This paper first applies the fuzzy set theory to multi-objective semi-definite program-ming （MSDP）, and proposes the fuzzy multi-objective semi-definite programming （FMSDP） model whose optimal efficient solution is defined for the first time, too. By constructing a membership function, the FMSDP is translated to the MSDP. Then we prove that the optimal efficient solution of FMSDP is consistent with the efficient solution of MSDP and present the optimality condition about these programming. At last, we give an algorithm for FMSDP by introducing a new membership function and a series of transformation. 展开更多
关键词 fuzzy multi-objective semi-definite programming membership function optimality efficient solution efficient solution optimality condition.
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基于早期预警评分建立的骨科术后患者程序化监护方案的应用价值研究 认领 引用 被引量：24
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作者 彭伶丽 杨佳琪 金惠 《中国全科医学》 CAS CSCD 北大核心 2012年第3期335-337,共3页
目的探讨基于早期预警评分(MEWS)的骨科术后患者程序化监护方案的应用价值。方法将骨科术后患者随机分为对照组(110例)和实验组(109例)。对照组采用传统的监测方案即根据医生医嘱进行监测,实验组采用根据MEWS评分设计的程序化监护方案... 目的探讨基于早期预警评分(MEWS)的骨科术后患者程序化监护方案的应用价值。方法将骨科术后患者随机分为对照组(110例)和实验组(109例)。对照组采用传统的监测方案即根据医生医嘱进行监测,实验组采用根据MEWS评分设计的程序化监护方案。对比分析两组意外事件发生率、30 d内病死率、ICU转入率、平均住院日及患者的满意度。结果实验组在意外事件发生率、30 d内病死率、ICU转入率、平均住院日均明显低于对照组,差异有统计学意义(P<0.05);实验组患者满意度明显高于对照组,差异有统计学意义(P<0.05)。结论基于MEWS评分建立的骨科术后患者程序化监护方案具有较好的应用价值,能降低骨科手术后患者风险的发生,有利于医护之间的合作,提高了患者的满意度,增强了护士的主动服务意识。 展开更多
关键词 早期预警评分 骨科 整体护理 程序化监护
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Equation oriented method for Rectisol wash modeling and analysis 认领 引用 被引量：5
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作者 高宁 翟持 +1 位作者 孙巍 张新宇 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第9期1530-1535,共6页
Rectisol process is more efficient in comparison with other physical or chemical absorption methods for gas purification. To implement a real time simulation of Rectisol process, thermodynamic model and simulation str... Rectisol process is more efficient in comparison with other physical or chemical absorption methods for gas purification. To implement a real time simulation of Rectisol process, thermodynamic model and simulation strategy are needed. In this paper, a method of modified statistical associated fluid theory with perturbation theory is used to predict thermodynamic behavior of process. As Rectisol process is a highly heat-integrated process with many loops, a method of equation oriented strategy, sequential quadratic programming, is used as the solver and the process converges perfectly. Then analyses are conducted with this simulator. 展开更多
关键词 Rectisol process simulation Modified statistical associated fluid theory Equation oriented Sequential quadratic programming
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基于微观和流变分析的岩沥青改性沥青性能评价 认领 引用 被引量：32
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作者 黄刚 何兆益 +1 位作者 胡诚 黄涛 《东南大学学报（自然科学版）》 EI CAS 北大核心 2010年第2期367-372,共6页
采用埃索70#沥青,以不同掺量的青川天然岩沥青为改性剂制备岩沥青改性沥青.通过红外光谱和差示扫描热量法(DSC)对天然岩沥青及岩沥青改性沥青的微观结构进行分析,研究其改性机理.采用SHRP试验对岩沥青改性沥青的高温、低温和抗疲劳性能... 采用埃索70#沥青,以不同掺量的青川天然岩沥青为改性剂制备岩沥青改性沥青.通过红外光谱和差示扫描热量法(DSC)对天然岩沥青及岩沥青改性沥青的微观结构进行分析,研究其改性机理.采用SHRP试验对岩沥青改性沥青的高温、低温和抗疲劳性能进行研究,并对不同掺量的岩沥青改性沥青进行了SHRP-PG分级.微观研究证明,天然岩沥青沥青质的杂原子基团含量高,芳香性和极性强.经过改性,基质沥青的微观结构发生了变化,岩沥青改性沥青的感温性降低,温度稳定性和水稳定性得到增强.流变特性分析表明岩沥青改性沥青的黏度明显提高,高温稳定性和抗疲劳性得到显著改善,可用于非极端低温的环境. 展开更多
关键词 岩沥青改性沥青 微观结构分析 改性机理 SHRP试验 性能
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基于动态规划算法的增程式电动汽车能量管理策略优化 认领 引用 被引量：24
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作者 席利贺 张欣 +1 位作者 耿聪 薛奇成 《交通运输工程学报》 EI CSCD 北大核心 2018年第3期148-156,共9页
提出了一种动态规划改进算法,根据约束条件确定未来可达状态序列,通过计算离散状态点间的转移代价,在保证求解精度的同时,降低了离线优化计算量;利用改进动态规划算法设计了增程式电动汽车能量管理策略,根据能量管理优化问题特点,建立... 提出了一种动态规划改进算法,根据约束条件确定未来可达状态序列,通过计算离散状态点间的转移代价,在保证求解精度的同时,降低了离线优化计算量;利用改进动态规划算法设计了增程式电动汽车能量管理策略,根据能量管理优化问题特点,建立了动力系统模型和适用于全局优化求解的系统状态方程,并确定了以动力电池荷电状态为系统状态量和增程器发电功率为系统控制量;在迭代计算过程中,将发动机燃油费用和动力电池电能费用之和作为目标函数,构建了基于北京主干道不同行驶里程仿真工况,得到了驱动电机需求功率最优分配结果;提取了增程器启停状态与动力电池荷电状态和驱动电机需求功率二者之间的控制规则,利用最小二乘法对增程器功率分流比与驱动电机需求功率的分布规律进行拟合,建立了基于优化规则的能量管理策略。仿真结果表明:对于行驶里程为100km的仿真工况,动态规划改进算法计算时间为7 239s,与经典动态规划算法相比计算效率提高了78.2%;基于优化规则的能量管理策略能够获得类似动态规划改进算法的控制效果,2种控制策略的动力电池荷电状态误差小于2.5%;相比实车电能消耗-电能维持型控制策略,基于优化规则的控制策略能够使整车经济性提高5.4%,使燃油经济性提高7.9%。 展开更多
关键词 汽车工程 增程式电动汽车 能量管理策略 动态规划 改进算法 燃油经济性
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有限元与改进单纯形法联合编程技术在位移反分析中的应用 认领 引用 被引量：5
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作者 肖铭钊 周承豪 +2 位作者 程芸 冯晓腊 杨俊梅 《岩土力学》 EI CAS CSCD 北大核心 2011年第3期899-904,共6页
根据弹性地基梁法基本思想,考虑基坑分步开挖和逐级加撑的动态施工因素,通过有限元计算模拟基坑实际开挖过程。结合现场监测数据,采用位移反分析方法反演各土层m值,并准确预测后续工况支护体的变形。采用有限元通用软件ANSYS内嵌的APDL... 根据弹性地基梁法基本思想,考虑基坑分步开挖和逐级加撑的动态施工因素,通过有限元计算模拟基坑实际开挖过程。结合现场监测数据,采用位移反分析方法反演各土层m值,并准确预测后续工况支护体的变形。采用有限元通用软件ANSYS内嵌的APDL语言编程建立支护体有限元计算模型,并应用数学软件MATLAB编制"改进单纯形法"优化程序,编写了接口程序,实现了MATLAB对ANSYS模型的实时循环调用和逐步寻优。武汉长江隧道武昌明挖段基坑工程算例证明,基于单纯形法的联合编程技术能方便、高效地被应用于支护体位移反分析预测中。建立了基于本工况预测下一工况或相邻断面的扩展型位移反分析预测模型,预测结果与实测结果拟合程度较高。 展开更多
关键词 改进单纯形法 联合编程 m值 位移反分析
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基于4G网络的气调保鲜配气远程监控系统设计与试验 认领 引用 被引量：12
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作者 左轩夷 张海瑜 +1 位作者 葛蔚 高志武 《农业机械学报》 EI CAS CSCD 北大核心 2022年第6期416-424,458,共9页
为提高生鲜农产品气调保鲜配气过程的精确度及自动化水平,设计了一套气调保鲜配气远程控制系统,依托嵌入的PID控制算法和质量流量控制器实现对原料气体流量、浓度和混配比的控制;以4G网络作为远程数据传输途径,选择4G DTU作为网络数据... 为提高生鲜农产品气调保鲜配气过程的精确度及自动化水平,设计了一套气调保鲜配气远程控制系统,依托嵌入的PID控制算法和质量流量控制器实现对原料气体流量、浓度和混配比的控制;以4G网络作为远程数据传输途径,选择4G DTU作为网络数据收发器,通过手机小程序实现移动客户端的远程监控功能。系统在结构上设置了气体参数感知层、数据网络传输层和控制操作应用层;基于配气系统远程监控要求,在PLC内部嵌入Modbus RTU程序,保障DTU与PLC之间的通信;使用TCP协议,使其与云服务器之间进行数据传输。根据对系统稳定性、准确性及其通信性能的测试,在配气稳定时配气体积分数平均误差绝对值在0.22%浮动,平均误差较传统方法降低了约91.67%,且配气速度提高50%左右,极大改善了配气场地的工作条件和生产效率,为进一步完善生鲜农产品气调保鲜自动化配气生产线提供了技术支持。 展开更多
关键词 气调保鲜 配气系统 远程监控 4G网络 手机小程序
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变围压循环下低渗透致密砂岩有效应力方程研究 认领 引用 被引量：20
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作者 郑玲丽 李闽 +1 位作者 钟水清 肖文联 《石油学报》 EI CAS 北大核心 2009年第4期588-592,共5页
采用了修正的析因设计方案,对低渗透致密砂岩进行了有效应力方程的实验研究。实验方案中包含多个循环,每个循环都是在孔隙流体压力不变,增加和降低围压的方式下进行。用稳态法采集各测点的渗透率,并用响应面法进行数据处理分析。结果表... 采用了修正的析因设计方案,对低渗透致密砂岩进行了有效应力方程的实验研究。实验方案中包含多个循环,每个循环都是在孔隙流体压力不变,增加和降低围压的方式下进行。用稳态法采集各测点的渗透率,并用响应面法进行数据处理分析。结果表明,有效应力系数随着围压的增加而减小,随着孔隙流体压力的增加而增大。在实验研究范围内,有效应力系数的最大值不超过0.88,当围压大、孔隙流体压力小时,有效应力系数远小于1.0,表明孔隙流体压力对渗透率变化的影响变得很小。用响应面方法获取的有效应力系数确定了有效应力,建立了渗透率与有效应力的关系,与传统有效应力的概念相吻合。 展开更多
关键词 低渗透致密砂岩 渗透率 有效应力 有效应力系数 响应面法 修正的析因设计
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基于改进多目标粒子群优化算法的企业再制造物流网络优化 认领 引用 被引量：9
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作者 李莉 程发新 +2 位作者 程显钦 王广东 潘婷 《计算机集成制造系统》 EI CSCD 北大核心 2018年第8期2122-2132,共11页
为解决碳税政策下的多目标企业再制造物流网络优化问题,综合考虑设施选址与运输方式选择,建立了总成本和碳排放最小化的混合整数规划模型。设计了约束处理机制改进多目标粒子群优化算法,并结合水泥企业运营管理数据验证了模型和算法的... 为解决碳税政策下的多目标企业再制造物流网络优化问题,综合考虑设施选址与运输方式选择,建立了总成本和碳排放最小化的混合整数规划模型。设计了约束处理机制改进多目标粒子群优化算法,并结合水泥企业运营管理数据验证了模型和算法的有效性。将改进多目标粒子群算法与第二代约束非支配排序遗传算法比较,凸显了改进多目标粒子群算法在求解中、大规模问题时的优越性。 展开更多
关键词 再制造 物流网络优化 混合整数规划 改进多目标粒子群优化算法
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