沉浸式虚拟现实的发展概况及发展趋势

本文简述了沉浸式虚拟现实四个阶段的发展概况,分析了沉浸式虚拟现实的优缺点,探讨了沉浸式虚拟现实的发展趋势.未来,头显设备将会更加轻巧,人机交互将会更加自然,沉浸式虚拟现实将会在各行各业得到普遍的应用.

毛细管气相色谱法同时测定果汁中山梨酸、苯甲酸、脱氢乙酸

目的建立同时快速测定果汁中山梨酸、苯甲酸、脱氢乙酸的毛细管气相色谱法。方法果汁样品经液-液萃取后,样品中山梨酸、苯甲酸、脱氢乙酸经过毛细管柱分离,气相色谱FID检测器进行检测。结果本方法在10 min内可完成定性和定量检测,方法的线性范围为100~500 mg/L,线性相关系数都大于0.999,3种添加剂的测定结果的相对标准偏差(n=7)都小于3%,山梨酸、苯甲酸、脱氢乙酸在100、300、600 mg/L添加水平的回收率为89.9%~108.9%。结论该方法快速、灵敏、性价比高,适合测定果汁中山梨酸、苯甲酸、脱氢乙酸的测定。

论网络交友诈骗与反诈宣传工作——基于359起案件的实证分析

虽然以“杀猪盘”为代表的新型网络交友诈骗受到全社会的广泛关注,但相关概念仍需厘清。通过对某市发生的359起网络交友诈骗案件的分析,可以发现此类犯罪手法多种多样,被害人的人口学特征十分明显,在从交友动机、引流与联络平台、心理控制机制到资金榨取手段的全流程上都呈现出新的特点。由此,相关的反诈宣传工作应当重视对被害人的去污名化,加大对女性、工人、自由职业和无业群体的宣传力度,并通过创新形式和突出重点来提高宣传成效。

Simultaneous Determination of Trace Rare Earth Elements and Other Elements in High Purity Terbium Oxide (Tb_4O_7) by ICP-AES After HPLC Separation Using P507 Resin

This article describes a new method for the simultaneous determination of trace rare earth elements (REEs) and non rare earth elements (NREEs) in high purity terbium oxide by ICP-AES after HPLC separation using P507 resin. The chromatographic separation of the analytes from the matrix using dilute nitric acid as mobile phase was studied. The experimental results showed that a favorable separation of trace metals (Cu and Gd) from the matrix (Tb) can easily be achieved by elution with dilute nitric acid within 25 min. The proposed method was applied to the determination of trace metals (Ca, Cu, Mg, Mn, Ni, Si, La, Ce, Pr, Nd, Sm, Eu and Gd) in high purity terbium oxide. The detection limits (DLs) for the analytes ranged from 0.4-4.0 μg\5g -1, and the recoveries are from 78%-105%.

Paraquat induces selective dopaminergic nigrostriatal degeneration in aging C57BL/6 mice

Background Paraquat （PQ; 1,1 ＇-dimethyl-4,4＇-bipyridinium）, a widely used herbicide that is structurally similar to the known dopaminergic neurotoxicant MPTP （1-methyl-l, 2, 3,6-tetrahydropyridine ）, has been suggested as a potential etiologic factor for the development of Parkinson＇ s disease （PD）. Aging is an accepted risk factor for idiopathic Parkinson＇ s disease. The aim of this study was to test the hypothesis that paraquat could induce PD-like nigrostriatal dopaminergic degeneration in aging C57BL/6 mice. Methods Senile male C57BL/6 mice were intraperitoneally injected with either saline or PQ at 2-day intervals for a total of 10 doses. Locomotor activity and performance on the pole test were measured 7 days after the last injection and animals were sacrificed one day later. Level of dopamine （DA） and its metabolites levels in the striatum were measured by high-performance liquid chromatography with an electrochemical detector （ HPLCECD）, and numbers of tyrosine hydroxylase （TH） positive neurons were estimated using immunohistochemistry. Results Locomotor activities were significantly decreased and the behavioral performance on the pole test were significantly impaired in the PQ treated group. Level of DA and its metabolites levels in the striatum were declined by 8 days after the last injection. Immunohistochemical analyses showed that PQ was associated with a reduction in numbers of tyrosine hydroxylase positive neurons. Conclusions Long-term repeated exposes to PQ can selectively impair the nigrostriatal dopaminergic system of senile mice, suggesting that PQ could play an important role in the pathogenesis of Parkinson＇ s disease （PD）. Our results also validate a novel model of PD induced by exposure to a toxic environmental agent.

基于竞合博弈的手机银行商业模式优化——以国有商业银行为例

手机银行作为移动互联网时代的新生事物,其突出的应用前景在实践中探索出不同的商业模式。随着商业银行对手机银行业务的愈发重视,手机银行的市场地位和作用也更加突出。鉴于国有商业银行开展手机银行业务时面临股份制商业银行和第三方平台的冲击,研究以国有商业银行手机银行为例,基于竞合博弈理论和Shapley值法对国有商业银行手机银行进行案例分析。结果表明,国有商业银行手机银行业务的无序竞争将导致自身经营成本上升,而横向协调合作策略下基于竞争基础的合作关系能够合理配置资源,增加市场份额,提高收益,实现共赢,为当前管理者决策提供参考。