关于配分函数的修正

本提出熵是宏观量、系统的微观状态应不考虑粒子交换的观点，并对配分函数修正和全同性原理的物理意义进行了讨论。     

利用灰色系统理论预测图书文献经费

正确预测图书文献经费可指导图书经费的使用。本文利用灰色系统理论建预测模型 ,预测未来四年我院图书、期刊经费 ,并对预测结果进行分析和评价 ,结果表明 :该方法有一定实用性和科学性 ;预测应注意模型的应用范围和精度     

甘蔗不同收获时间蔗糖含量的测定及变化分析

为测定及分析甘蔗在不同收获时间蔗糖含量的变化,采用水处理甘蔗样品,采取高效液相色谱法,经Waters Sugar PakⅠ柱(6.5 mm×300 mm,10.0μm),Waters 2414示差折光检测器(RID)检测,流动相为高纯水,流速:1.0 mL·min-1,柱温:90℃,检测器温度:35℃.结果显示该法相对标准偏差(RSD)(n=6)<2%,回收率为95%~105%,蔗糖质量浓度为10~50 mg·mL-1.且甘蔗在不同的收割时间蔗糖含量变化较明显,基本在14:00~15:00时达到最大值.实验表明HPLC法能够较快且较准确测出甘蔗中蔗糖的含量.通过比较可知,甘蔗蔗茎中蔗糖含量是随着光合作用的强弱而变化的.     

梨ISSR-PCR反应体系的正交优化研究

以‘饼子梨’为试材,利用正交设计L16(45)研究了反应体系中引物、模板DNA浓度等5个因素4个水平对梨反应体系的影响,PCR结果应用极差分析和MINITAB软件对扩增结果进行方差分析.梨最佳ISSR-PCR反应体系:25μL反应体系中含2.5μL 10×Buffer,2.0mmol/L Mg2+,0.25mmol/L dNTPs,0.25μmol/L引物,60ng模板DNA,0.75UTaq DNA聚合酶.优化的ISSR-PCR反应体系稳定性高和重复性较好,为梨品种指纹图谱构建和遗传多样性分析奠定基础.     

资源可获得性认知、创业自我效能感与创业意图的关系研究

创业意图对创业者的创业行为有着重要引导作用,一直是创业研究关注的焦点。通过对相关理论的梳理,引入资源可获得性认知,构建了创业意图影响因素模型,通过问卷调查数据,利用结构方程模型(SEM)检验了资源可获得性认知、创业自我效能感和创业意图之间的关系。研究结果表明:资源可获得性认知对创业自我效能感和创业意图产生直接的正向影响,创业自我效能感与创业意图之间的关系则并不明显。研究结果揭示了资源可获得性认知对创业者的重要性,也对创业自我效能感与创业意图之间关系不显著的原因进行了解释。     

津市市土地利用变化对生态系统服务价值的影响

土地利用/覆盖变化与生态系统服务价值是相互影响、相互制约的,对二者进行定量研究,可为生态社会经济的可持续健康发展提供参考依据.根据津市市1996-2005年土地利用变更调查数据,采用Costanza等的生态系统服务价值计算方法以及谢高地等提出的符合中国实际的陆地生态系统单位面积生态服务价值表计算津市市生态系统服务价值并对其进行分析,结果表明生态系统服务价值总量增加了18.41×106元,年均变化率为0.19%,在生态系统单项服务功能中,除了食物生产功能外,其他单项服务价值都在增加.同时,生态系统服务价值空间差异明显,总体而言东南部地区服务价值较高,中西部稍低,而北部地区尤其是涔澹农场服务价值的增长幅度大.     

Influence of the carbon cycle on the attribution of responsibility for climate change

The carbon cycle is one of the fundamental climate change issues.Its long-term evolution largely affects the amplitude and trend of human-induced climate change,as well as the formulation and implementation of emission reduction policy and technology for stabilizing the atmospheric CO2concentration.Two earth system models incorporating the global carbon cycle,the Community Earth System Model and the Beijing Normal University-Earth System Model,were used to investigate the effect of the carbon cycle on the attribution of the historical responsibility for climate change.The simulations show that when compared with the criterion based on cumulative emissions,the developed(developing)countries’responsibility is reduced(increased)by 6%–10%using atmospheric CO2concentration as the criterion.This discrepancy is attributed to the fact that the developed world contributed approximately61%–68%(61%–64%)to the change in global oceanic(terrestrial)carbon sequestration for the period from 1850 to2005,whereas the developing world contributed approximately 32%–49%(36%–39%).Under a developed world emissions scenario,the relatively larger uptake of global carbon sinks reduced the developed countries’responsibility for carbon emissions but increased their responsibility for global ocean acidification(68%).In addition,the large emissions from the developed world reduced the efficiency of the global carbon sinks,which may affect the long-term carbon sequestration and exacerbate global warming in the future.Therefore,it is necessary to further consider the interaction between carbon emissions and the carbon cycle when formulating emission reduction policy.     

Passive-source ocean bottom seismograph （OBS） array experiment in South China Sea and data quality analyses

Long-term passive source ocean bottom seis- mograph （OBS） observatory is challenging due to various technical difficulties. In order to gain experience in this field, and to reveal the lithospheric structure beneath the extinct ridge in the central South China Sea （SCS）, we carried out a passive source OBS array experiment, which includes 18 OBSs, in the deep portion of SCS. Here we present the instrumentation, the OBS deployment and recovery of this experiment, and more importantly, the data quality evaluated by a number of approaches. Through processing and inspecting waveforms from global, regional and local earthquakes, we find that most of recovered OBSs have good data quality with discernible main phases. The ambient noise analyses of OBS recordings show that their noise is higher than the global average, and the horizontal component is noisier than the vertical, indicating current impacts on horizontal components are more severe. In the period range of 5-10 s, there is a noise notch for the SCS OBSs, and noise levels of horizontal components are comparable to the vertical. This feature, which is not seen at OBS stations in open ocean, suggests the distant sources for double frequency microseism in this marginal sea are not significant. In addition, we successfully determined the orientations for 7 OBSs by investigating their Rayleigh wave polarizations; and we demonstrated the dispersion feature of Rayleigh waves through the frequency-time analysis. Finally, we summarized lessons learned from this experiment regarding the passive source OBS investiga- tions in SCS.     

Investigation of self-assembled protein dimers through an artificial ion channel for DNA sensing

Artificial nanopores have become promising tools for sensing DNA. Here, we report a new technique for sensing DNA through a conical-shaped nanopore embed- ded in track-etched polyethylene terephthalate （PET） membrane. Two different streptavidin-conjugated mono- valent DNA probes were prepared that can bind to two distinct segments （at either end） of the target DNA. The size of target DNA-linked to the two streptavidin-conju- gated monovalent DNA probes is double that of the indi- vidual probes. By precisely controlling the tip diameter of the conical nanopore embedded in the PET polymer, events due to the translocation of the streptavidin-conjugated monovalent DNA probes through the nanopore can be fil- tered and purposely undetected, whereas the current pulses due to the translocation of the target DNA-induced self- assembled complexes can be detected. The two streptavi- din-conjugated DNA probes cannot be linked by multi- mismatched DNA. Therefore, multi-mismatched （non- specific） DNA will not induce any current pulse signatures. The current pulse signatures for the self-assembled com- plex can be used to confirm the presence of the target DNA. The size-dependent detection of self-assembled complexes on the molecular level shows strong promise for the detection of biomolecules without interference from the probes.     

脉冲积分微分方程的一致Lipschitz稳定性

利用Lyapunov函数和Razumikhin技巧研究了脉冲积分微分方程的稳定性,建立了方程零解一致Lipschitz稳定的若干充分条件,并给出例子.