黑河流域生态环境脆弱性研究

黑河流域地处河西走廊中部，其特殊的气候条件和地貌特征对当地生态环境起主要的控制性作用，加之人类活动的影响，植被、土壤和水等环境都表现出不同程度的脆弱性特征．具体表现为土地沙化、土壤盐渍化、草场退化、水资源减少、植被单一、生物多样性丧失等．从恢复生态学的观点出发，探索维持生态系统稳定性和恢复重建机制．     

The Global Partnership for Education’s evolving support to fragile and conflict-affected states

In this study, we trace the history of policy development within the Global Partnership for Education to discern the drivers behind the uptake of its shifting policies relating to education in fragile and conflict-affected states. In order to elucidate how and why this international organization has altered its policy stance and funding modalities, we employ a process tracing analysis of document and interview data. Moreover, we provide three country case studies of Global Partnership for Education financing to Liberia, Madagascar, and the Democratic Republic of the Congo.     

Increased erythrocyte resistance to osmotic lysis in the acute hepatitis caused by true hepatotropic viruses non-A, non-B (nanb)

An unexpected increase in erythrocyte osmotic resistance during viral hepatitis in two patients prompted study of effects of hepatitis (in Karad) on osmotic resistance. The test was performed by placing erythrocytes in saline solutions of decreasing osmolarity and osmotic fragility defined in terms of the saline concentration at which hemolysis begins. Study included 44 infected subjects (acute viral hepatitis non-A non-B). All forty four infected subjects showed abnormal results when compared to normal subjects. increased erythrocyte osmotic resistance i.e. hemolysis begins between 0.45% to 0.40% of NaCl and is completed between 0.25% to 0.20% NaCl, whereas in normal subjects. hemolysis begins between 0.50% to 0.45% NaCl and is completed between 0.35% to 0.30% NaCl. Osmotic resistance was observed with increase in total bilirubin (mean±SD) (4.6 ±3.6), direct bilirubin (3.0±2.5), SGOT (58.8±55.5) SGPT (114.2±150.3) activity. Physiologic shifts in erythrocyte osmotic resistance may be due to changes in membrane lipid ratio.     

企业商业秘密保护的脆性问题及保护策略

商业秘密是企业重要的无形资产，也是企业形成和谋求长期竞争优势的重要手段。在市场经济中，信息社会里，对企业商业秘密侵蚀无处不在，防范企业商业秘密被侵蚀是企业永恒的主题。由于商业秘密具有非专有性特征，决定了企业对其商业秘密的保护具有脆弱性，容易产生失密、权利被侵犯等问题。单一的保护方法也难以达到企业对商业秘密的目的。因此必须采取综合手段才能达到有效预防保护的目的。     

A new semi-fragile watermarking algorithm for image authentication

1 Introduction1 With the rapid development of Internet, digital multimedia can be easily shared via computer networks and conveniently processed for queries in databases. At the same time, the powerful multimedia manipulation software has made it possible to edit and alter the media’s content seamlessly, which breeds the demand of a secure authentication system to verify authentication. Digital watermarking has been proposed as a possible solution for data and tamper detection. An authentica…     

Preservice teachers’ knowledge of proof by mathematical induction

There is a growing effort to make proof central to all students’ mathematical experiences across all grades. Success in this goal depends highly on teachers’ knowledge of proof, but limited research has examined this knowledge. This paper contributes to this domain of research by investigating preservice elementary and secondary school mathematics teachers’ knowledge of proof by mathematical induction. This research can inform the knowledge about preservice teachers that mathematics teacher educators need in order to effectively teach proof to preservice teachers. Our analysis is based on written responses of 95 participants to specially developed tasks and on semi-structured interviews with 11 of them. The findings show that preservice teachers from both groups have difficulties that center around: (1) the essence of the base step of the induction method; (2) the meaning associated with the inductive step in proving the implication P(k) ⇒ P(k + 1) for an arbitrary k in the domain of discourse of P(n); and (3) the possibility of the truth set of a sentence in a statement proved by mathematical induction to include values outside its domain of discourse. The difficulties about the base and inductive steps are more salient among preservice elementary than secondary school teachers, but the difficulties about whether proofs by induction should be as encompassing as they could be are equally important for both groups. Implications for mathematics teacher education and future research are discussed in light of these findings.

中国经济增长与环境脆弱性的因果及冲击响应分析

随着我国经济建设的不断深入，环境问题越来越严重。我们也越来越需要以科学的手段，运用统计推断的方法，从实际观测数据中对经济与环境的关系特别是因果关系做出客观判断。本文采用主成分分析方法对我国环境脆弱性进行了测度，运用格兰杰因果与脉冲响应函数分析中国经济增长与环境脆弱性之间的关系。结果显示：中国经济增长与环境脆弱性之间存在着互为因果的关系，但是经济增长与环境脆弱性之间是否存在格兰杰因果关系在很大程度上受到了其滞后期数的影响，而且这两者对对方的影响还存在着明显的差异。经济增长对环境脆弱性的影响具有明显的时滞性，是一种长期的、渐进的影响；而环境脆弱性对经济增长的影响的时滞却较短，是一种短期的、非渐进的影响。     

一次大强度耐力训练对优秀竞走运动员红细胞渗透脆性的影响

用末梢血（耳血）代替静脉血，用毫摩尔浓度代替百分浓度，用6个浓度梯度代替13个浓度梯度，改良了红细胞渗透脆性的测定方法，用改良后的方法测定了一次竞走强化耐力训练对血乳酸、红细胞渗透脆性、红细胞ATP酶、血红蛋白浓度的影响；并对其变化作了初步分析。     

论成人教育文化之脆弱--新世纪对成人教育的反思

成人教育长期以来步履维艰，世纪之交又面临“想要”和“不想要”的十字路口，原因可以归于成人教育文化的脆弱。     

计算机网络安全的问题

网络安全问题是由通信硬件设施的脆弱性和网络信息系统的脆弱性共同导致的。在网络通信硬件设施的安全方面，应注重机房的物理环境和电气环境，在网络信息系统的安全方面，应加强访问控制和信息加密。