哈达门国家森林公园游客量动态预测

根据哈达门国家森林公园的票房数据，应用灰色系统理论建立旅游量灰色动态模型。基此，对哈园游客量进行了中短期预测，其预测检验精度为９３．７２。旨在对该园建设、管理等项决策提供科学依据。     

哈尔滨市工农兵钢箱索梁桥模型试验研究

对哈尔滨市工农兵钢箱索梁桥的模型进行了试验和分析。结果表明,该桥设计采用的理论与试验结果基本相符,为桥梁的修复设计提供了可靠依据。     

Performance Evaluation of the ADS 1000 Ventilator Using a Lung Model

A laboratory evaluation was performed to evaluate the performance characteristics of a new veterinary ventilator. The ventilator studied was configured according to manufacturer's directions and attached to a test lung via a pneumotachograph and differential pressure transducer interfaced to a pulmonary mechanics analyzer system. Constant resistance (R=10 cm H₂O/L/sec) and compliance (C=3 ml/cm H₂O) factors were maintained for all trials. The ventilator operated at the manufacturer's preprogrammed parameters. In the first trial, body weight was the only variable. In the second trial, an endotracheal tube was placed in series between the ventilator's breathing circuit and the pneumotachograph. Body weights from 1–20 kgs were evaluated. Mean values for respiratory rate (RR), minute ventilation (VE), inspiratory time (Ti), peak inspiratory pressure (PIP), and peak inspiratory flow (Fpki) displayed on the ventilator control panel; tidal volume (VT), calculated from the displayed minute volume, and identical parameters measured by the pulmonary mechanics system at each body weight, were compared using a two factor analysis of variance. Significant differences (P< 0.05) were found between mean displayed and measured values for RR, PIP, and Fpki.     

系统工程在畜牧业中的应用

本文主要从畜牧业发展战略与规划、遗传育种、营养、养猪、养禽、养羊、养牛等方面阐述了系统工程近二十年来在畜牧业的应用。     

Analysis of a Long-term Experiment with Repeated-measurement Models

Long‐term experiments are a classical case of repeated measurements. Traits are measured on the same experimental unit over many years so that correlations arise between the observations made on the same plot in consecutive years. This paper describes the analysis of a three‐crop‐rotation long‐term experiment. We analysed the yields of the crops and the organic carbon content in the topsoil over 30 consecutive years. Several variance–covariance approaches are discussed and the trait‐specific best fit is interpreted. Mixed models are used to describe the structure of the experiment. Both yields and soil organic carbon show a more or less pronounced variance heterogeneity. Especially for yields, the heterogeneity of cycles and years is dominant. The consideration of correlations results in a better model fit in all cases.     

浅谈建立郑州市道路路面养护管理系统

路面管理系统是通过对路面运行状况、使用性能、使用周期、进行对比、分析，预测路面管理的最佳养护预算投资并在最佳养护经济投资条件等各种因素限制下，寻求道路养护管理最佳战略决策。     

单纯疱疹病毒脑炎模型的研究

对单纯疱疹病毒(HSV)感染小鼠致病特点进行了观察,小鼠感染HSV第3天后开始发病,感染后第2天脑内可检测出病毒核酸,第3天脑内可分离出病毒,第4天病毒滴度达到高峰,发病2天内死亡。电镜观察感染鼠脑内组织出现超微结构改变,并可找到病毒颗粒。结果说明所建立的HSV脑炎模型可用于评价抗HSV药物。     

一类挖坑机械钻头横向振动系统的最优控制问题

建立了一类挖坑机械钻头横向振动系统的数学模型,并以阻尼函数作为控制变量,研究了该系统的最优控制问题,得出了两个定理。     

应用数码育种新方法改良晋番茄1号

数码育种是作者根据十几年的育种经验总结出的一套育种新方法。实践证明,应用该方法使育种目标更明确,育种路线更正确,选配组合更精确,育种路径更快捷,克服了选配组合的随机性和盲目性,能够在最短的时间内,以最少的投入,达到预期的育种目标。     

岷江上游乡村社区贫困成因及扶贫模式初探——以四川黑水国家扶贫开发重点县为例

农村发展包括乡村社区发展和农户发展两个方面 ,二者不能偏废。以岷江上游国家扶贫开发重点县———黑水为例 ,探讨乡村社区贫困成因及扶贫模式。社区贫困是多种因素长期综合作用的结果 ,包括自然环境条件、传统习俗与贫困文化结合、道路交通贫乏、森林资源利用政策以及落后守旧的农业生产技术和手段。乡村社区扶贫不同于区域扶贫 ,应以新村建设和易地迁建为主 ,辅以劳务输出、旅游开发和教育扶持。