Two Job’s tears cultivars, yy18-1 (high resistance to drought stress) and yy12-7 (susceptible to drought stress) were used to investigate the responses of seed germination, root and seedling growth, and seedling anti...Two Job’s tears cultivars, yy18-1 (high resistance to drought stress) and yy12-7 (susceptible to drought stress) were used to investigate the responses of seed germination, root and seedling growth, and seedling antioxidant characteristics to drought stress simulated by polyethylene glycol (PEG) 6000 solutions with 0, -0.05, -0.1, -0.15, and -0.2 MPa osmotic potentials. The results showed that the germination energy, germination rate, germination index, root and seedling lengths, root and seedling diameters, root and seedling fresh masses, root and seedling dry masses, and seedling relative water content (RWC) decreased with the decrease of the osmotic potential of PEG 6000 solution. The contents of hydrogen peroxide (H2O2), malondialdehyde (MDA), and proline in seedling increased with the decrease of the osmotic potential of PEG 6000 solution. The activities of peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) in seedling increased and then decreased with the decrease of osmotic potential of PEG 6000 solution. -0.1 MPa was the optimal osmotic potential of PEG 6000 solution simulated drought stress at germination stage for Job’s tears. The proline content and activities of POD and CAT were important mechanisms for the maintenance of drought resistance in Job’s tears seedling.展开更多
As China’s CPI is soaring almost in all walks of life in the past months, more and more people began to adopt online transanctions to save household expense, especially the Spring Festival holiday is approaching,
In this study we used the deep eutectic solvents (ionic liquids) to investigate the reaction between copper (II) with ethylene diamine (en). Two of the existing methods for analyzing spectrophotometric measurements ha...In this study we used the deep eutectic solvents (ionic liquids) to investigate the reaction between copper (II) with ethylene diamine (en). Two of the existing methods for analyzing spectrophotometric measurements have been applied for establishing, the stoichiometry and whenever possible, the stability constants of the chelates formed. The method of continuous variations was necessary to determine first whether, the metal ion and the ligand ethylene diamine form one or more than one chelate, when more than one chelate formed, the results obtained depend on the wavelength and for meaningful conclusions the wavelengths were carefully selected. The empirical formulae of the chelates were further substantiated by the molar ratio method. The effect of time and temperature on the formation and stability of these chelates in solution is also studied. The stability constants, K1 and K2 for the copper (II) chelates were calculated, though reliable, and are comparable to literature values.展开更多
Under the condition of asymmetric information,the Spence 's Job Market Signaling Model is generally applied to inspect the design capability of a designer and his labor and efforts to be invested; however,since th...Under the condition of asymmetric information,the Spence 's Job Market Signaling Model is generally applied to inspect the design capability of a designer and his labor and efforts to be invested; however,since the"prior probability"and "posterior probability"have great uncertainties,the practical effect of this model is poor. On the basis of analyzing reverse selection questions,this paper provides a design capability screening model,which can make a designer automatically expose his hidden information so that necessary actions can be taken as required by the owner to realize risk sharing. A calculation example is finally given to demonstrate that the new model is helpful for an owner to select a designer with high professional level and to lead the designer to work hard,so it is of significant application value.展开更多
The phenomenon of Cenozoic migrant worker shortage is a realism problem of China's enterprise, and Cenozoic migrant worker has become an important force occupied the social structure. So the study of Cenozoic migr...The phenomenon of Cenozoic migrant worker shortage is a realism problem of China's enterprise, and Cenozoic migrant worker has become an important force occupied the social structure. So the study of Cenozoic migrant worker's status and the demand is imperative. Understand employees' both psychological and physiological satisfaction of enterprises' environmental factors, and make some corresponding changes is of great help to reduce the employee turnover rate. This paper commenced to research from the Cenozoic migrant worker 's characteristics, analyzed conditions and puts forward the corresponding countermeasures.展开更多
Considering the independent optimization requirement for each demander of modernmanufacture, we explore the application of noncooperative game in production scheduling research,and model scheduling problem as competit...Considering the independent optimization requirement for each demander of modernmanufacture, we explore the application of noncooperative game in production scheduling research,and model scheduling problem as competition of machine resources among a group of selfish jobs.Each job has its own performance objective. For the single machine, multi-jobs and non-preemptivescheduling problem, a noncooperative game model is established. Based on the model, many prob-lems about Nash equilibrium solution, such as the existence, quantity, properties of solution space,performance of solution and algorithm are discussed. The results are tested by numerical example.展开更多
Extraction of sulphonated dyes through supramolecular interaction with calix[4]arene derivatives is being presented here. The selectivity of calixarene derivatives namely piperidine derivative of calix[4]arene (calix-...Extraction of sulphonated dyes through supramolecular interaction with calix[4]arene derivatives is being presented here. The selectivity of calixarene derivatives namely piperidine derivative of calix[4]arene (calix-1), 1-methyl piperazine derivative of calix[4]arene (calix-2), and di-methyl amine derivative of calix[4]arene (calix-3) were evaluated initially against reactive red 2 (RR-2), acid black (AB), reactive blue 19 (B-19) and synthetic dye (D-2) by liquid-liquid extraction experiment. The results showed that the above three calixarenes possess excellent complexation abilities toward the selected dyes. The stoichiometric ratio for the calixarene derivatives and dyes was estimated through Job’s plot, whereas Hildebrand-Benesi equation was used to calculate formation constant (K<sub>s</sub>) and molar absorptivity (Δε) of complexes. The binding association (K<sub>a</sub>) and dissociation (K<sub>d</sub>) constants were calculated by Scatchard plot additionally to further support the complexation data obtained from Hildebrand-Benesi equation. Conversely association constants from, both Hildebrand-Benesi equation and Scatchard plot i.e. K<sub>s</sub> and K<sub>a</sub> favor strong binding interaction between calix-1: D-2, calix-2: B-19, and calix-3: AB complexes. Thus present study adeptly supports the complexation of calixarene derivatives for sulfonated dyes.展开更多
乔布斯去世前曾提出一个深刻的质疑:"为什么IT改变了几乎所有的领域,却唯独对教育的影响小得令人吃惊?"因此,本文将此称之为"乔布斯之问",对其进行了深刻的个体心理与文化战略解读,并以此问题为主线,对近两年来席...乔布斯去世前曾提出一个深刻的质疑:"为什么IT改变了几乎所有的领域,却唯独对教育的影响小得令人吃惊?"因此,本文将此称之为"乔布斯之问",对其进行了深刻的个体心理与文化战略解读,并以此问题为主线,对近两年来席卷全球,被称之为MOOCs(Massive Open Online Courses)的大规模开放在线课程新潮流进行了现实考察、理论探究、未来展望和跨文化沉思。论文认为,这是21世纪教育冲破"机械灌输+标准化考试"的"工业流水线"人才培养模式,引发学习方式变革的攻坚战。这场变革目前正在集聚智慧和能量、酝酿重大突破。文章对MOOCs潮流中的麻省理工学院与哈佛大学联手发起的edX、以斯坦福大学为背景的Udacity和Coursera这三大典型分别进行了个案剖析,从宏观战略视角提出了新一代网络课程深化发展必须破解的三大难题,并在操作层面从教学模式、评价模式、运维体制、校内外结合四大关键环节探讨了破解的成功之道,揭示出成功的关键在于能否实现三种智慧(学习智慧、IT智慧、商业智慧)的内在结合。论文最后对"乔布斯之问"展开了更深层次的跨文化沉思,揭示了名牌大学优秀课程作为一种重要的文化战略资源在国际互联网新时空中的传播,是世界不同文化的竞争博弈,是21世纪人类文明发展在碰撞、交流、理解、沟通中走向相互尊重、和谐共赢的一条希望之路。展开更多
文摘Two Job’s tears cultivars, yy18-1 (high resistance to drought stress) and yy12-7 (susceptible to drought stress) were used to investigate the responses of seed germination, root and seedling growth, and seedling antioxidant characteristics to drought stress simulated by polyethylene glycol (PEG) 6000 solutions with 0, -0.05, -0.1, -0.15, and -0.2 MPa osmotic potentials. The results showed that the germination energy, germination rate, germination index, root and seedling lengths, root and seedling diameters, root and seedling fresh masses, root and seedling dry masses, and seedling relative water content (RWC) decreased with the decrease of the osmotic potential of PEG 6000 solution. The contents of hydrogen peroxide (H2O2), malondialdehyde (MDA), and proline in seedling increased with the decrease of the osmotic potential of PEG 6000 solution. The activities of peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) in seedling increased and then decreased with the decrease of osmotic potential of PEG 6000 solution. -0.1 MPa was the optimal osmotic potential of PEG 6000 solution simulated drought stress at germination stage for Job’s tears. The proline content and activities of POD and CAT were important mechanisms for the maintenance of drought resistance in Job’s tears seedling.
文摘As China’s CPI is soaring almost in all walks of life in the past months, more and more people began to adopt online transanctions to save household expense, especially the Spring Festival holiday is approaching,
文摘In this study we used the deep eutectic solvents (ionic liquids) to investigate the reaction between copper (II) with ethylene diamine (en). Two of the existing methods for analyzing spectrophotometric measurements have been applied for establishing, the stoichiometry and whenever possible, the stability constants of the chelates formed. The method of continuous variations was necessary to determine first whether, the metal ion and the ligand ethylene diamine form one or more than one chelate, when more than one chelate formed, the results obtained depend on the wavelength and for meaningful conclusions the wavelengths were carefully selected. The empirical formulae of the chelates were further substantiated by the molar ratio method. The effect of time and temperature on the formation and stability of these chelates in solution is also studied. The stability constants, K1 and K2 for the copper (II) chelates were calculated, though reliable, and are comparable to literature values.
基金Sponsored by State Key Laboratory of Subtropical Building Science,Autonomous Research Topics(Grant No.x2tjc7100870)
文摘Under the condition of asymmetric information,the Spence 's Job Market Signaling Model is generally applied to inspect the design capability of a designer and his labor and efforts to be invested; however,since the"prior probability"and "posterior probability"have great uncertainties,the practical effect of this model is poor. On the basis of analyzing reverse selection questions,this paper provides a design capability screening model,which can make a designer automatically expose his hidden information so that necessary actions can be taken as required by the owner to realize risk sharing. A calculation example is finally given to demonstrate that the new model is helpful for an owner to select a designer with high professional level and to lead the designer to work hard,so it is of significant application value.
文摘The phenomenon of Cenozoic migrant worker shortage is a realism problem of China's enterprise, and Cenozoic migrant worker has become an important force occupied the social structure. So the study of Cenozoic migrant worker's status and the demand is imperative. Understand employees' both psychological and physiological satisfaction of enterprises' environmental factors, and make some corresponding changes is of great help to reduce the employee turnover rate. This paper commenced to research from the Cenozoic migrant worker 's characteristics, analyzed conditions and puts forward the corresponding countermeasures.
文摘Considering the independent optimization requirement for each demander of modernmanufacture, we explore the application of noncooperative game in production scheduling research,and model scheduling problem as competition of machine resources among a group of selfish jobs.Each job has its own performance objective. For the single machine, multi-jobs and non-preemptivescheduling problem, a noncooperative game model is established. Based on the model, many prob-lems about Nash equilibrium solution, such as the existence, quantity, properties of solution space,performance of solution and algorithm are discussed. The results are tested by numerical example.
文摘Extraction of sulphonated dyes through supramolecular interaction with calix[4]arene derivatives is being presented here. The selectivity of calixarene derivatives namely piperidine derivative of calix[4]arene (calix-1), 1-methyl piperazine derivative of calix[4]arene (calix-2), and di-methyl amine derivative of calix[4]arene (calix-3) were evaluated initially against reactive red 2 (RR-2), acid black (AB), reactive blue 19 (B-19) and synthetic dye (D-2) by liquid-liquid extraction experiment. The results showed that the above three calixarenes possess excellent complexation abilities toward the selected dyes. The stoichiometric ratio for the calixarene derivatives and dyes was estimated through Job’s plot, whereas Hildebrand-Benesi equation was used to calculate formation constant (K<sub>s</sub>) and molar absorptivity (Δε) of complexes. The binding association (K<sub>a</sub>) and dissociation (K<sub>d</sub>) constants were calculated by Scatchard plot additionally to further support the complexation data obtained from Hildebrand-Benesi equation. Conversely association constants from, both Hildebrand-Benesi equation and Scatchard plot i.e. K<sub>s</sub> and K<sub>a</sub> favor strong binding interaction between calix-1: D-2, calix-2: B-19, and calix-3: AB complexes. Thus present study adeptly supports the complexation of calixarene derivatives for sulfonated dyes.
文摘乔布斯去世前曾提出一个深刻的质疑:"为什么IT改变了几乎所有的领域,却唯独对教育的影响小得令人吃惊?"因此,本文将此称之为"乔布斯之问",对其进行了深刻的个体心理与文化战略解读,并以此问题为主线,对近两年来席卷全球,被称之为MOOCs(Massive Open Online Courses)的大规模开放在线课程新潮流进行了现实考察、理论探究、未来展望和跨文化沉思。论文认为,这是21世纪教育冲破"机械灌输+标准化考试"的"工业流水线"人才培养模式,引发学习方式变革的攻坚战。这场变革目前正在集聚智慧和能量、酝酿重大突破。文章对MOOCs潮流中的麻省理工学院与哈佛大学联手发起的edX、以斯坦福大学为背景的Udacity和Coursera这三大典型分别进行了个案剖析,从宏观战略视角提出了新一代网络课程深化发展必须破解的三大难题,并在操作层面从教学模式、评价模式、运维体制、校内外结合四大关键环节探讨了破解的成功之道,揭示出成功的关键在于能否实现三种智慧(学习智慧、IT智慧、商业智慧)的内在结合。论文最后对"乔布斯之问"展开了更深层次的跨文化沉思,揭示了名牌大学优秀课程作为一种重要的文化战略资源在国际互联网新时空中的传播,是世界不同文化的竞争博弈,是21世纪人类文明发展在碰撞、交流、理解、沟通中走向相互尊重、和谐共赢的一条希望之路。
