科创中国

引入企业生命周期作为调节变量,基于中国A股房地产与电器行业上市公司2003 ~ 2009年的季度面板数据,分析了营运效率、竞争有效性及二者间交互作用对企业绩效的影响机制.实证结果表明:对于成长期企业,影响绩效的关键因素是营运效率,竞争有效性与营运效率之间具有一定的替代性;而对于成熟期企业,营运效率则与绩效呈"倒U"型关系,影响绩效的关键因素转变为竞争有效性,二者之间存在互补性,并且这种互补作用主要体现在竞争程度较低的行业中.

在综合比较知识管理成熟度模型的基础上,充分借鉴诸多知识管理成熟度模型的特性,结合我国企业知识管理实践,提出企业知识管理成熟度整合模型,并深入剖析其逻辑结构、成熟等级、关键过程领域以及实施程序,为现代企业有效实施知识管理项目,提升知识管理能力和绩效提供借鉴和帮助.

时间贴现的年龄发展具有阶段性.前额皮质,边缘系统和多巴胺能系统的发展成熟是从儿童期到成人期时间贴现发展变化的神经生物基础.成人期到老年期时间贴现年龄特征的研究结果不一致.概率贴现、未来定向、延迟满足等被用来探讨时间贴现年龄发展特征.可以从大脑不同区域的发展轨迹,延迟时段的心理意义来进一步深入研究.

对白云凹陷采集的27个原油样品的芳烃组成进行了系统的研究.其分布特征和相对含量表明,原油母质具明显的陆源高等植物输入特征,沉积环境以氧化环境为主,根据萘系列、菲系列、二苯并噻吩系列化合物的相对含量分布差异,优选有效的烷基萘、烷基菲、烷基二苯并噻吩成熟度指标,综合分析了白云凹陷原油成熟度特征.原油总体属于成熟一高成熟原油,结合生物标志化合物组成可划分为A、B两类,A类原油的成熟度高于B类原油.还选用有效的成熟度参数探讨了白云凹陷油气运移规律,如三甲基萘比值,该参数指示油气运移方向沿白云主洼中心向周围运移,且邻近番禺低隆起,运移方向由西向东,即沿着成熟度由高到低方向运移.

Life-history theory predicts that in hibemators age of maturation is related positively to body size and negatively to the duration of active season aboveground. Yellow souslik is a large-sized ground squirrel with long hibernation, which suggests late maturation. We used four-year field observations of marked individuals to determine the age of maturation in males through analysis of age-dependent variation in body size, mass, androgen status, timing of spring emergence, ranging patterns and social behavior during the mating season. Yearling males were smaller, lighter, had lower level of fecal testosterone, emerged later and had smaller home ranges than older males. Social activity and the number of females encountered did not differ between age classes. After the second hibernation none of the studied parameters varied with age. Cluster analysis revealed two behavioral tactics: "active" males (adults only) emerged earlier, ranged more widely, initiated more contacts, encountered more females and were heavier than "passive" males (both yearling and adult). Thus, males of S. fulvus reached adult size and matured after two hibernations, which is relatively fast for such a big species with short active period. Indirect evidence for copulations and high variation among yearlings in all parameters suggest that some of them might successfully compete with adults. Active tactic of wandering and searching for females is energetically costly, and probably only adult males in good physical condition can afford it, whereas passive tactic of residing is energy saving and good for adults in poor condition and for yearlings that are continuing to grow.

从获批试点城市到江苏无锡基本实现4G网络全覆盖,前后仅花了一年时间.在如此短的时间内,江苏无锡TD-LTE(4G)网络建设从无到有,从有到优,为什么能做到又好又快?比较官方的答案是:因为有了各级政府部门的高度重视和大力支持,以及中国移动江苏公司无锡分公司(以下简称无锡移动)全心全意、全力以赴的高度责任感和不畏艰难勇于创新的不懈努

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明朝文学家李贽说:"夫童心者,绝假纯真,最初一念之本心也."童真既是儿童的本性,也是每一个成年人心底永久的珍藏.童年往往是我们一生中最美好的时光."人为什么要长大?"很多人经常这样问自己.成长是不可逆转的,每个人迟早都会慢慢长大成熟,这是自然规律.但成熟的代价是我们失去了很多东西,并且失去的永远失去了,其中就包括童真.

患者,50岁,月经规则(7/30天),孕3产3,偶发现盆腔包块,近3个月肿块逐渐增大,遂入院.腹诊:双侧下腹部及盆腔内分别扪及2个包块,左侧包块直径约14 cm,右侧直径约8 cm,压痛,边界清楚,活动度欠佳;子宫、双侧附件扪诊不清.彩超示:盆腔双侧卵巢混合型占位性病变,提示畸胎瘤.术前血常规、血电解质、肿瘤标志物(CA125、CA199、

目的 探讨妊娠期糖尿病合并高血压疾病孕妇孕中期血清尿素氮、肌酐、尿酸水平变化.方法 选取妊娠期糖尿病合并高血压疾病孕中期孕妇178例为观察组,同期体检健康的孕中期孕妇175例为对照组,分别行空腹血糖、餐后2h血糖、血压、血清尿素氮、肌酐、尿酸检测.结果 观察组空腹血糖、餐后2h血糖、舒张压、收缩压、血清尿素氮、肌酐、尿酸水平均明显高于对照组(P均<0.05).结论 妊娠期糖尿病合并高血压疾病孕中期孕妇体内血清尿素氮、肌酐、尿酸水平显著升高,应提高警惕并提前予以治疗控制,可改善孕妇预后.