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911.
设N、P分别是全体正整数和奇素数的集合.本文运用初等数论方法部分地解决了有关万程(xp-yp)/(x-y)=z2,x,y,z∈N,X>y+1,ged(x,y)=1,p∈P,P>3(*)的Ljunggren问题,即证明了:方程(*)仅有解(x,y,z,p)=(3,1,11,5)可使x是奇素数的方幂 相似文献
912.
张保祥 《长江大学学报(社会科学版)》2002,(2)
解非线性方程的方法很多 ,能使用一个通用的方法解非线性方程吗 ?为此例谈Newton法 ,按程式认识Newton法、收敛性、实例分析实方程的实根、复根和复方程的复根、初值和选取等 . 相似文献
913.
吴勇旗 《湛江师范学院学报》2008,29(3):32-35
利用规范变换得到了一个微分差分方程的Darboux变换,该方程与一个离散谱问题相联系.作为应用.得到了这个微分差分方程的显式解. 相似文献
914.
The propensity for military service (PMS) of young Americans is an important issue for our Armed Forces. Since the 1990s, the PMS of young Americans has steadily declined. Overtime, a declining PMS may cause military mission degradation, lowering of military recruitment standards, base closures, and reinstatement of the unpopular military draft system. This paper investigates the moderator effect of prior military service on the Generalized Exchange-PMS relationship. Generalized exchange is when indirect benefits such as preserving freedom and the American way of life accrue to the larger society because of an individual's military service. This paper uses a structural equation modelling approach to analyse the moderating effect of prior military exposure on prospective recruits regarding their PMS. Findings indicate that the group of prospective recruits with prior military exposure had higher levels of PMS than the group without such exposure, that is, the young people with prior military exposure are more likely to enlist in the military than the young Americans with no prior military exposure. 相似文献
915.
Exploring Gender Differences on Internalizing and Externalizing Behavior Among Maltreated Youth: Implications for Social Work Action 总被引:1,自引:0,他引:1
Tina Maschi Keith Morgen Carolyn Bradley Schnavia Smith Hatcher 《Child and Adolescent Social Work Journal》2008,25(6):531-547
This purpose of this study was to explore the moderating influence of gender on the relationship between child maltreatment
and internalizing symptoms (e.g., affective and somatic problems) and externalizing behavior (e.g., rule breaking behavior
and aggression) among children aged 7–12 years old. Using a longitudinal comparison group design and a sample of 300 youth
of which 56% (n = 168) had substantiated cases of child maltreatment, results of a structural equation modeling revealed that internalizing
symptoms exerted a mediating influence that was conditioned by gender. Only girls’ internalizing symptoms were found to mediate
the link between child maltreatment and externalizing behavior while a direct relationship between maltreatment and externalizing
behavior was found among boys. These findings provide evidence for gender differences in the pathways between being child
maltreatment and maladaptive thoughts, feelings, and behaviors. Thus, adapting evidence-based strategies that target gender
specific internalizing behaviors and externalizing behaviors among maltreated youth may significantly reduce the risk of short
and long-term maladaptive behavior. 相似文献
916.
917.
陈银兴 《东华理工学院学报》1997,(3):73-80
在恒温、恒压的条件下,本文从范特荷夫等温方程出发,导出一计算理想气体反应吉布斯自由能变化馆的公式,利用此公式我们可以更为详尽地讨论恒温、恒压下影响化学平衡的因素;由此公式还可以得出传统的勒·查特勒原理其正确性是有条件的. 相似文献
918.
设a是正整数,数列满足遍推关系u0=1,u1=a,um+2=aum1+um(m≥0),函数本。文证明了:对于任何正整数a,当且仅当X=0或者X=u2n-1/u2n(n∈N)时,U(x)是正整数上述结果完整地解决了Brugia、DiPorto和Filipponi提出的一个公开问题 相似文献
919.
对于传统比率制动式电流差动保护 ,在外部短路时电流互感器深度饱和误差造成的不平衡电流 ,及当内部短路时可能存在的流出电流 ,均可能引起差动保护误动或拒动。文章介绍一种新型差动保护判据 ,分析其动作特性 ,并在此基础上提出新型的差动保护方案 相似文献
920.
Sarah J. Schoppe-Sullivan Alice C. Schermerhorn E. Mark Cummings 《Journal of marriage and the family》2007,69(5):1118-1134
This investigation tested whether parenting mediates longitudinal associations between marital conflict and children’s adjustment. Data were drawn from a three‐wave study of 283 families with children aged 8 – 16 years at Wave 1. Relations among marital conflict, parenting (behavioral control, psychological autonomy, and warmth), and children’s adjustment (externalizing and internalizing) were examined. Structural equation models indicated multiple dimensions of parenting mediated relations between marital conflict and children’s adjustment. When including controls for earlier adjustment, behavioral control continued to mediate relations between marital conflict and change in children’s internalizing symptoms over time. These results advance parenting process models for relations between marital conflict and child adjustment and provide impetus for study of other pathways, including direct and child effects. 相似文献