网络游戏成瘾的动机及抑制性因素作用的实证研究

网络游戏成瘾往往会给青少年造成极大的身心危害,迄今为止学术界对网络游戏成瘾动机的研究已有一些研究成果,但对如何抑制网络游戏成瘾尚无任何实证研究成果.构建了一个模型包含网络游戏成瘾动机因素和抑制性因素的综合模型,用以测量各种措施对青少年网络游戏成瘾行为的影响作用.该研究对上海多个中学进行问卷调查,共采集到623个有效样本.研究结果显示,在所有抑制性因素中,只有兴趣转移和父母监控与网络游戏成瘾呈显著负相关,而经济开销对网络游戏成瘾影响很小.另外,在所有动机因素中,只有机制(Mechanics)、关系(Relationship)和逃避(Escapism)显著正相关于网络游戏成瘾.     

纳米SnO_2的氧缺陷研究──Mossbauer谱与PAT寿命谱

本文采用Ｍｏｓｓｂａｕｅｒ谱和ＰＡＴ寿命谱对纳米ＳｎＯ_２进行研究。结果表明，纳米ＳｎＯ_２的界面相和在真空环境处理造成的氧缺陷，使Ｓｎ４＋的离子特征下降，改变了样品的超精细结构参数。根据正电子在表面缺陷湮没的两种不同机制，分析了捕获缺陷的类型及其浓度的变化情况。实验表明，纳米ＳｎＯ_２晶界缺陷处Ｓｎ原子附近的电子密度较大，结构中的氧缺陷使电子密度进一步增大。     

Differential sensitivity to tributyltin of cytochrome-containing and cytochrome-deficient cells ofEscherichia coli SASX76

Summary The effect of tributyltin (TBT) chloride on the growth of cytochrome-deficient and cytochrome-containing cells ofEscherichia coli SASX76 was examined. The former cells were found to be at least 20 times more sensitive to TBT. It is proposed that the differential sensitivity of these two cell types to the biocide, TBT, may be due to a different mode of energy generation by cytochrome-deficient and cytochrome-sufficient cells. In addition to the energy state, the pH change caused by the presence and absence of cytochromes which occurred during growth also resulted in a differential sensitivity of these cells.Acknowledgments. This research was financially supported by a grant from the University Grants Commission, New Delhi, India, to APS. The authors thank the Head, Department of Botany, B.H.U. for facilities.     

17例肝移植新肝早期凝血功能障碍的处理

目的探讨肝移植新肝早期凝血功能障碍的处理.方法17例肝硬化或肝豆状核变性病人在全麻下行活体部分供肝或尸肝移植.全身麻醉采用静注咪唑安定0.1mg/kg,丙泊酚1mg/kg,芬太尼0.3μg/kg及维库溴铵0.15mg/kg行气管插管后,接呼吸机间歇正压通气(IPPV)并加呼气末正压通气(PEEP)5cmH2O.术中除持续监测循环、呼吸、体温变化外,间断监测生化、血常规及凝血指标.凝血指标包括激活全血凝血时间(ACT)、凝血酶原时间(PT)、凝血酶时间(TT)、部分凝血活酶时间(APTT)、纤维蛋白原(Fbg)和血小板(PLT)的量.结果与无肝前期相比,无肝期及新肝早期存在严重凝血功能障碍(P<0.05).结论在严密监测凝血指标的前提下,采用血制品的输入如新鲜冰冻血浆、冷沉淀、血小板、凝血酶原复合物及使用血液回收机自体血回输,抑肽酶持续微泵注射,应用少量鱼精蛋白等综合措施能有效纠正新肝早期凝血功能障碍,有条件时用血栓弹力描记仪更有助于指导凝血功能的纠正.     

可数个微分算式生成的J─自伴算子

由可个微分算式在对应直和空间内生成的Ｊ－对称微分算子．当亏指数为可数无穷时．本文给出了Ｊ－自伴延拓的解析描述．并包容了亏指数为有限和由有限个微分算式生成的Ｊ－对称算子的Ｊ－自伴域解析描述。     

代数体函数的Valiron型亏量椭圆定理的推广

本文讨论了 n 值代数体函数的亏量,推广了 T.Sato 的一个结果,建立了代数体函数关于 Valiron 亏量的椭圆定理。     

Expression of the mutant gene for L-gulono-γ-lactone oxidase in scurvy-prone rats

A mutant strain of Wistar rats with L-gulono--lactone oxidase deficiency has recently been established. To investigate this deficiency by DNA and RNA blot hybridization analyses, a fragment of a previously cloned cDNA encoding rat L-gulono--lactone oxidase was used as a probe. When genomic DNA of the mutant rat was digested with several restriction enzymes, the probe hybridized to fragments of the same sizes as those produced from DNA of normal rats. Poly(A)⁺RNA from the liver of the mutant rat was found to contain an L-gulono--lactone oxidase-specific mRNA of a normal size at a comparable level to that of normal rats. An in vitro translation experiment revealed that the mRNA programmed the synthesis of an enzyme protein which had the same molecular weight as that of the translational product of the normal mRNA, although the amount synthesized was markedly reduced as compared with that synthesized with the normal mRNA. In accordance with this observation, a very low but definite degree of L-gulono--lactone oxidase activity was detected in the microsomes of the mutant rat by a newly developed, highly sensitive method.Acknowledgments. The authors thank Dr Susumu Makino, Shionogi Research Laboratories, Shionogi & Co., Ltd, Japan, for his kind donation of normal (ODS- +/+) and ODS (ODS-od/od) rats. This work was supported in part by Grant-in-Aid (59570103) for Scientific Research from the Ministry of Education, Science and Culture of Japan.     

关于一类亏函数的亏量和取最大值的亚纯函数

设 f(z)是下级μ<∞的亚纯函数,α_i(z)是满足 T(r,a_i)=0{T(r,f)}的亚纯函数,若(?)δ(a_i(z)),f)=1;δ(∞,f)=1,则 a),的级γ=μ,且为正整数;b)f 的亏函数总数≤μ+1;c)每一个亏量为1/μ的整数倍;d)每一个亏函数都是 f 的渐近函数。     

拾遗补缺的素养——节目主持人语言艺术散论

拾遗补缺水平的高低可反映出主持人现场应变能力的大小。通过不同角度的生动的主持实例分析可知，节目主持人拾遗补缺需具备几大素养：面对意外不测事故，主持人应有良好的心态，勇于面对挫折，敢于承认错误，要有坦诚相见、谦虚谨慎的意志品质；要有善于抢抓时机的反应快捷的素质；要真诚、善意地对待受众：还要有相当的机智灵活的智力素养。     

关于我国环境问题的道德思考

环境问题是21世纪经济全球化和实现可持续发展需要解决的一个重要问题。当前，许多人盲目追求经济效益，缺乏保护环境的自觉性，环境道德缺失，导致自然环境遭到严重破坏。为此，应大力开展环境保护宣传，使人们树立起保护环境的意识，尊重自然界的客观规律，只有这样，才能使自然环境可持续地造福于人类。