东风-12型旋耕机刀轴疲劳寿命分析

讨论了构件在复杂载荷作用下其疲劳寿命的估算问题和根据线性累积损伤理论 ,通过引入当量载荷推导出构件在弯扭载荷作用下的疲劳寿命估算式 ,并利用刀轴弯扭载荷谱估算了刀轴的疲劳寿命 ,为刀轴的改进设计提供了理论依据。

东风12-JY型手扶变型运输机转向运动分析

东风-12JY型手扶变型运输机（以下简称变型运输机）是采用东风-12型手扶拖拉机运输机组（以下简称手拖）底盘，将转向扶手改成转向盘，转向离合器改成差速器，与后挂车连接在一起组成的铰接式折腰转向运输机组。该机克服了手拖转向操纵困难．以及在下坡行驶时需反向操作的弊病，有效提高了变型运输机运输安全作业的可靠性，具有机型小、结构简单、操纵方便灵活及机动性强等特点。

东风-61型手扶拖拉机

为了适应市场形势,常州拖拉机厂研制和批量生产了东风-61型手扶拖拉机,现将其性能作一简单介绍。 1.结构及使用特点东风-61型手扶拖拉机的结构如图所示。 (1)变速箱采用整体式,不但使结构简化,箱体数减少,还提高了整机的可靠性,杜绝了渗漏现象。该机发动机可在变速箱体前后安装,当发动机前置时,可作犁耕、旋耕、运输等作业;当发动机后置时,可作收割、扫雪等需前端动力输出的作业。该机与割晒机配套时,长度比东风-12型同类机组缩短了1.2米。

“东风-107”停止研制

在112厂试制的“东风－113”飞机，由于哈军工来的同志不能如期拿出成套设计图纸，试制进展缓慢。而国防科委要求加快研制进度，争取向建党四十周年献礼。1959年10月22日，试制领导小组召开第三次会议，决定集中力量保证“东风一113”飞机的试制，停止“东风－107”的研制，将原“东风－107”飞机的设计力量全部转入“东风－113”飞机的设计。

东风悦达-千里马八大常见故障诊断

诊断：车子在雨天行驶时，由于泥水、尘土、雨滴等溅落在底盘等处，产生粘连和阻隔作用，使ABS传感器和连接磁感应线圈产生传导不良，导致ABS在自检时出现故障，警示灯亮起。

如何正确使用东风-300型轮式拖拉机

304型轮式拖拉机为东风农机集团公司(常州拖拉机厂)近年来开发的机型,是目前国内拖拉机行业技术水平较为领先的一种新型拖拉机。

巡天神剑东风-15

1995年7月和1996年3月，中国第二炮兵部队在台湾海峡举行了举世瞩目的弹道导弹试验。许多人对这些试验的政治意义十分关心．实际上这些行动也是导弹部队在诸兵种合成作战条件下的演练。正如美国海军情报部的一份解密报告所说的，在实战条件下进行演习也是此次行动的一个附带目的。

东风-12C型手扶拖拉机 东风-12型的变型设计

东风-12型手扶拖拉机自1968年投产以来。到目前已有近20个厂批量生产。20多年来,东风-12型手扶拖拉机一直保持着旺盛发展的势头,特别是近几年,随着农村经济体制改革,手扶拖拉机在农村中的用途更加广泛,因而对手扶拖拉机的设计、用途、质量等方面提出了更高要求。如何满足用户新的要求,使东风-12型手扶拖拉机更加完善,

东风EQ6100-5环保型电控发动机简介

东风EQ6100-5环保型电控发动机是在原EQ6100汽油发动机的基础上改制而成的,它取消了分电器,由电脑控制点火和空燃比闭环控制,同时配有三效催化转化器。基本保持了原EQ6100发动机的指标,它们的主要零件和安装尺寸没有变化,适用对象也相同。

Interdecadal variability of summer precipitation in the Three River Source Region: Influences of SST and zonal shifts of the East Asian subtropical westerly jet

Summer precipitation in the Three Rivers Source Region(TRSR)of China is vital for the headwaters of the Yellow,Yangtze,and Lancang rivers and exhibits significant interdecadal variability.This study investigates the influence of the East Asian westerly jet(EAWJ)on TRSR rainfall.A strong correlation is found between TRSR summer precipitation and the Jet Zonal Position Index(JZPI)of the EAWJ from 1961 to 2019(R=0.619,p<0.01).During periods when a positive JZPI indicates a westward shift in the EAWJ,enhanced water vapor anomalies,warmer air,and low-level convergence anomalies contribute to increased TRSR summer precipitation.Using empirical orthogonal function and regression analyses,this research identifies the influence of large-scale circulation anomalies associated with the Atlantic–Eurasian teleconnection(AEA)from the North Atlantic(NA).The interdecadal variability between the NA and central tropical Pacific(CTP)significantly affects TRSR precipitation.This influence is mediated through the AEA via a Rossby wave train extending eastward along the EAWJ,and another south of 45°N.Moreover,the NA–CTP Opposite Phase Index(OPI),which quantifies the difference between the summer mean sea surface temperatures of the NA and the CTP,is identified as a critical factor in modulating the strength of this teleconnection and influencing the zonal position of the EAWJ.

特大暴雨的中-β尺度系统研究

受 0 0 1 2号台风 (派比安 )外围影响 ,在 2 0 0 0年 8月 3 0日 0 8时到 3 1日 0 8时 ,江苏东北部地区出现了一次具有局域性、突发性、高强度、超历史记录的特大暴雨过程。经综合分析表明 :暴雨期间 ,在台风外围第二象限稳定的东风气流 ,并发生扰动 ,构成产生特大暴雨的中尺度东风辐合线天气系统。这条中尺度东风辐合线高频次的准东西向和高频次的准南北向分布、更替 ,与响水≥ 1 0mm雨团的高频区相一致。由地面速度平流散度 (F)分析得出 ,强雨团是与F >0的强中心趋于一致 ,也即是在辐合增强或维持最强的响水及其附近爆发。进一步分析表明

PCR-DGGE Analysis of Bacterial Communities Structure in Babylonia areolata Culture Systems of The Subtidal Zone and The Pond Mulched Plastic Film and Sand in Bottom

To know the bacterial communities structure in Babylonia areolata culture systems and to research and optimize the management pattem of Babylonia areola-ta culture systems of the pond mulched plastic film and sand in bottom, the bacte- rial communities in Babylonia areolata culture systems of the sub-tidal zone and the pond mulched plastic film and sand in bottom were analyzed at molecular level by adopting the denaturing gradient gel electrophoresis （DGGE）. The results indicated that the dominant bacterial communities in Babylonia areolata culture systems of the sub-tidal zone and the pond mulched plastic film and sand in bottom, which were built on the basis of the seawater in East-island of Zhanjiang, included Proteobac- teda Chloroflexi, Cyanobacteria and Actinobacteria. The dominant bacterial groups in the above pond culture system were Garnmaproteobacteria, Alphaproteobacteria, Deltaprotecbacteda, Epsilonproteobacteda, Anaerolineae, Cyanobacteria and Acti- nobacteda. The dominant bacterial communities in the subtidal zone culture system were Gammaprotecbacteda, Alphaproteobacteria, Deltaproteobacteria, Anaerolineae and Cyanobacteda, and there were less Epsilonproteobacteria and Actinobacteria in the culture system. The higher diversity was detected in the above two culture sys- tems. The results of unweighted pair group method with arithmetic average （UPG- MA） showed that the bacterial communities of the sediment samples S1 and S2 in the above two culture systems were a cluster, the similarity of bacterial communities was 54.5%. The bacterial communities of seawater samples S3 and S4 in the above culture systems were in clusters, and the similarity of the bacterial communi- ties was 84.0%. The results showed that the microorganism ecological level in the Babylonia areolata culture systems of the pond mulched plastic film and sand in bottom could be similar to the sub-tidal zone culture systems through changing the pond seawater and monitoring the microbial population.

Temporal-Spatial Variances of Holocene Precipitation at the Marginal Area of the East Asian Monsoon Influences from Pollen Evidence

The woodland-steppe ecotone in the. southern Nei Mongol Plateau is located at the northern edge of the east Asian monsoon influences. A marked southeastern - northwestern (SE - NW) precipitation gradient exists in this region. Quantitative reconstruction of palaeo-precipitation of this region is helpful to reveal the development of monsoon climate and to predict die future desertification. Based on modern vegetation and surface pollen studies, a pollen-precipitation transfer function in the study region was established. Pollen data from three sediment sequences within the ecotone were used to reconstruct palaeo-precipitation during the Holocene. The processes of precipitation changes in the three sequences were quite different. There was a tendency of precipitation declined from the onset of the Holocene to 1 100 a BP in Haoluku. But, in Liuzhouwan and Xiaoniuchang, both located south of Haoluku, the annual precipitation reached highest values during 7 800 - 6 200 a BP and 7 200 - 5 000 a BP, respectively. The influences of southwestern (SW) monsoon and the variances of topographical conditions have possibly caused these temporal-spatial variances.

1GM-1型灭茬机的研制

当前随着我国社会主义新农村建设不断发展，农业机械化的推广运用也得到了很大的发展。东风-12型手扶拖拉机推向市场后，产品在吉林省各地深受欢迎，但与该拖拉机配套的农机具尚未解决，影响了该拖拉机的推广和拖拉机的利用率，1GM-1型灭茬机是与东风-12型手扶拖拉机配套使用的小型灭茬机具，适用于玉米、高粱等作物的机械灭茬还田作业。该机具有结构简单、性能可靠、使用调整方便、坚固耐用、工作效率高等特点。

An East Asian Monsoon in the Mid-Pliocene

In this study, the authors simulate the East Asian climate changes in the mid-Pliocene (～3.3 to 3.0 Ma BP) with the Community Atmosphere Model version 3.1 (CAM3.1) and compare the simulated East Asian monsoon with paleoclimate data. The simulations show an obvious warming pattern in East Asia in the mid-Pliocene compared with the pre-industrial climate, with surface air temperature increasing by 0.5 4.0°C. In the warm mid-Pliocene simulation, the East Asian Summer Monsoon (EASM) becomes stronger, while the East Asian Winter Monsoon (EAWM) is similar relative to the pre-industrial climate. Compared with the paleoclimate data, our simulations depict the intensified EASM well but cannot reproduce the weakened EAWM. This model-data discrepancy may be attributed to the uncertainty in the reconstructed mid-Pliocene sea surface temperature.

Variations in the annual cycle of the East Asian monsoon and its phase-induced interseasonal rainfall anomalies in China

The East Asian monsoon(EAM)exhibits a robust annual cycle with significant interannual variability.Here,the authors find that the EAM annual cycle can be decomposed into the equinoctial and solstitial modes in the combined sea level pressure,850-hPa low-level wind,and rainfall fields.The solstitial mode shows a zonal pressure contrast between the continental thermal low and the western Pacific subtropical high,reaching its peak in July and dominating the East Asian summer monsoon.The equinoctial mode shows an approximate zonal contrast between the low-level cyclone over the east of the Tibetan Plateau and the western Pacific anticyclone over the east of the Philippines.It prevails during the spring rainy season in South China and reaches its peak in April.The interannual variations of the lead–lag phase of the two modes may result in the negative correlation of rainfall anomalies in North China between spring and fall and in South China between winter and summer,which provides a potential basis for the across-seasonal prediction of rainfall.The warm phase of ENSO in winter could give rise to the reverse interseasonal rainfall anomalies in South China,while the SST anomaly in the Northwest Pacific Ocean may regulate the rainfall anomaly in North China.

Regularity of Wind-dispelling Medication Prescribed by LI Dong-Yuan:A Data Mining Technology-based Study

Objective To extract and analyze information on the regularity with which wind-dispelling medication was prescribed by LI Dong-Yuan and many doctors of his school of thought and to provide theoretical basis and ideas for modern clinical application to facilitate the use,research,and development of these medications.Methods Original data on wind-dispelling medication described in LI Dong-Yuan’s works were collected,sorted and organized.Data mining and comprehensive analysis were performed by using a series of data processing softwares,such as SPSS 22.0,Modeler 18.0 and x Miner.By reviewing LI Dong-Yuan’s writings on wind-dispelling medication,the number of prescriptions for wind-dispelling medication were counted.Frequency of use of wind-dispelling medication was determined,and association rules analysis,factor analysis,and core drug network analysis were used to reveal associations of the symptoms of syndromes and treatment with wind-dispelling medication and to reveal the regularity with which these medications were prescribed by LI Dong-Yuan.Results A total of 356 prescriptions and 121 flavors of winddispelling medication were observed.Among them,five kinds of medicinal properties,seven kinds of medicinal tastes,and 12 kinds of meridians were identified.Furthermore,herbs were divided into 18 categories according to their efficacy.Statistical analysis showed that there were 23 wind-dispelling medications that were prescribed with a frequency of≥60.The mainly used drugs were Saposhnikoviae Radix(Fang Feng,防风),Bupleuri Radix(Chai Hu,柴胡),Cimicifugae Rhizoma(Sheng Ma,升麻),Notopterygii Rhizoma Et Radix(Qiang Huo,羌活),Puerariae Lobatae Radix(Ge Gen,葛根),Chuanxiong Rhizoma(Chuan Xiong,川芎),and Ephedrae Herba(Ma Huang,麻黄).In addition,we analyzed the association rules wind-dispelling medication and obtained 23 one-to-one drug association rules and 11 multiple-to-one drug association rules.The core drug network analysis data visualization showed core drugs used in the treatment of external wind assailing the exterior(wind-cold,wind-heat,wind-dampness,etc.),wind-stroke,and tonifying middle and replenishing Qi.Factor analysis was performed on the drugs used by LI Dong-Yuan,and finally 4 groups of wind medicine combinations were obtained.Conclusions This data mining-based study on the regularity of wind-dispelling medication described in LI Dong-Yuan’s works is of great significance,because it reveals the clinical application of its theoretical formulae and medications.