论歌唱呼吸对抗力的训练与运用

歌唱中的大多数问题,都可以在呼吸中找到原因。因此,对歌唱呼吸的关注和锻炼,应该也必须贯穿歌唱者学习和工作的全部过程。文章对于歌唱呼吸对抗力的训练与运用分别进行了分析,指出呼吸可以最大限度地改善声带机能,对抗力的训练在一定程度上就是呼吸与声带搭配能力的训练,声带张力与呼吸的对抗力可以说是同时获得锻炼的。     

生物化学及其实验课程教学的现状及其改革措施——以贵州民族学院为例

分析了当前生物化学教学中存在的问题;研究和探索了生物化学及其实验教学改革的思路和措施.     

关于城镇职工养老金制度改革现实取向的若干思考

由于人口老龄化和较高的工资替代率 ,城镇职工养老总额与职工工资总额的比例逐渐上升 ,因此 ,必须对我国的养老制度进行重构 :提高职工本人缴费数额 ,从现有的国有资产存量中“割一块”注入已退休职工和跨体制职工的养老金个人帐户。而改制成功必须具备三个条件 ,一是大力发展非银行金融机构确保养老金基金保值增值 ;二是发展补充养老保险与个人储蓄养老保险 ;三是要加强法制建设 ,确保养老金制度的有法可依     

论邓小平关于新时期精神文明建设的基本思路

邓小平在领导中国进行社会主义现代化建设的伟大事业中,始终把社会主义精神文明建设放在突出的地位,提出了精神文明建设的基本思路和对策．学习邓小平关于精神文明建设的重要论述,把握其思想核心,对于我们搞好社会主义精神文明建设具有重大的现实意义和长远的指导意义。     

Does a More Diversified Revenue Structure Lead to Greater Financial Capacity and Less Vulnerability in Nonprofit Organizations? A Bibliometric and Meta-Analysis

VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - This article explores how and to what extent revenue diversification and concentration strategies affect financial...     

快速轨道交通对城市群可达性影响研究——以京津冀城市群为例

快速轨道交通是城市群主要城市间联系的骨架,是城市群一体化发展的重要基础。笔者通过对比分析国内外城市群的交通模式,建立可达性测度指标,分析快速轨道交通的发展对城市群内各城市可达性的影响,并以京津冀城市群为例,计算城市群可达性指标,基于快速轨道交通发展对城市群可达性的影响因素进行分析,以期为京津冀城市群快速轨道交通发展做出评估,为制定城市群轨道交通发展战略提供参考。     

Bayesian nonparametric modelling of the link function in the single-index model using a Bernstein–Dirichlet process prior

This paper proposes the use of the Bernstein–Dirichlet process prior for a new nonparametric approach to estimating the link function in the single-index model (SIM). The Bernstein–Dirichlet process prior has so far mainly been used for nonparametric density estimation. Here we modify this approach to allow for an approximation of the unknown link function. Instead of the usual Gaussian distribution, the error term is assumed to be asymmetric Laplace distributed which increases the flexibility and robustness of the SIM. To automatically identify truly active predictors, spike-and-slab priors are used for Bayesian variable selection. Posterior computations are performed via a Metropolis-Hastings-within-Gibbs sampler using a truncation-based algorithm for stick-breaking priors. We compare the efficiency of the proposed approach with well-established techniques in an extensive simulation study and illustrate its practical performance by an application to nonparametric modelling of the power consumption in a sewage treatment plant.     

Robust inference for estimating equations with nonignorably missing data based on SIR algorithm

Nonresponse is a very common phenomenon in survey sampling. Nonignorable nonresponse – that is, a response mechanism that depends on the values of the variable having nonresponse – is the most difficult type of nonresponse to handle. This article develops a robust estimation approach to estimating equations (EEs) by incorporating the modelling of nonignorably missing data, the generalized method of moments (GMM) method and the imputation of EEs via the observed data rather than the imputed missing values when some responses are subject to nonignorably missingness. Based on a particular semiparametric logistic model for nonignorable missing response, this paper proposes the modified EEs to calculate the conditional expectation under nonignorably missing data. We can apply the GMM to infer the parameters. The advantage of our method is that it replaces the non-parametric kernel-smoothing with a parametric sampling importance resampling (SIR) procedure to avoid nonparametric kernel-smoothing problems with high dimensional covariates. The proposed method is shown to be more robust than some current approaches by the simulations.     

A misspecification test for the higher order co-moments of the factor model

The traditional estimation of higher order co-moments of non-normal random variables by the sample analog of the expectation faces a curse of dimensionality, as the number of parameters increases steeply when the dimension increases. Imposing a factor structure on the process solves this problem; however, it leads to the challenging task of selecting an appropriate factor model. This paper contributes by proposing a test that exploits the following feature: when the factor model is correctly specified, the higher order co-moments of the unexplained return variation are sparse. It recommends a general to specific approach for selecting the factor model by choosing the most parsimonious specification for which the sparsity assumption is satisfied. This approach uses a Wald or Gumbel test statistic for testing the joint statistical significance of the co-moments that are zero when the factor model is correctly specified. The asymptotic distribution of the test is derived. An extensive simulation study confirms the good finite sample properties of the approach. This paper illustrates the practical usefulness of factor selection on daily returns of random subsets of S&P 100 constituents.     

Lighting Effects on Older Adults’ Visual and Nonvisual Performance: A Systematic Review

Lighting plays an important role in daily life: It helps people perform daily activities independently and safely, and also benefits their health. This study assesses the research evidence of lighting’s impacts on older adults in four domains: (a) performance of activities of daily living and instrumental activities of daily living; (b) circadian rhythm; (c) fall prevention and postural stability; and (d) sleep quality. A comprehensive review of lighting studies on older adults’ visual and nonvisual performance was conducted using a modified PRISMA systematic review process. For the first domain, some older adults had difficulty in using the toilet, preparing meals, and doing laundry under lower illuminance. For the second domain, brighter and bluish lighting improved older adults’ circadian rhythm. For the third domain, low-intensity LED lighting affixed on door frames can help older adults maintain postural stability and prevent falling during nighttime movement. Finally, some studies concluded that receiving outdoor daylight during exercise was beneficial to older adults’ sleep quality. This study provides several methodological, theoretical, and collaborative suggestions for developing a more conclusive evidence base for lighting standards and strategies for older adults.