大肠杆菌内毒素引起肉鸡腹水症的诊治

头面部肿胀、下痢、腹水、腹腔纤维素性渗出及肝脏周围炎、腹膜炎是大肠杆菌内毒素引起的肉鸡腹水症的主要特征,通过临诊症状、病理剖检及细菌分离确诊本病,采用环境消毒及抗生素治疗可有效控制本病.     

Study on model for remote sensing estimation of maize yield

Through analysis of perpendicular vegetation index (PVI) from combination of visible and near-infrared spectrums reflecting the feature of crop reflectance, we come to the conclusion that the index can better indicate crop instantaneous photosynthesis whereas people generally regard it as the representation of crop leaf area index (LAI). Exploration of crop photosynthesis within a day and its period of duration leads to production of photosynthetic vegetation index (PST) that can reflect the whole crop accumulated photosynthesis, which means the total biomass produced by crop, moreover the method simulating PST is put forward by employment of multi-temporal spectrum parameters. On the basis of the achievements mentioned above, a new comprehensive model for remote sensing estimation of maize yield is established, which can comprehensively show major physiological actions of maize and the course of its yield formation, organically integrate various effective ways of crop yield estimation. It lays a solid foundation for carrying out remote sensing estimation of maize yield on a large scale.     

BIOGEOCHEMICAL MECHANISM OF POSTDEPOSITIONAL MIGRATION OF Fe AND Mn IN LAKE AHA, CHINA

I.INTRODUCTIONLakeAhaisamedium--sizedartificialreservoirwithseasonallyanoxichypolirnnion,andawaterresourceofGuizhouProvince,China,builtin1958,workedin1960andexpandedin1982.Ithasadrainagebasinof190kmZwithaverageannualtemperatureof15.3tandprecipitationof1109rum.Openplantcover,containiflgshrubandgrass,surroundsthelake,andsialliticandstfeteyellowsoilisdevelopedonPe~ianlimestoneandcoallayer,meanwhile,OThisprojectwassupportedbytheNationalNaturalaudienceFOundationofChinaandtheaudienceFOund…     

基于数据挖掘与网络药理学探讨中医药治疗肝肾不足型类风湿关节炎的用药规律及作用机制

目的：探讨中医药治疗肝肾不足型类风湿关节炎（RA）的用药规律,并探索核心药物的作用机制。方法：搜索中国知网（CNKI）、万方数据（WANFANG DATA）、维普中文科技期刊数据库（VIP）自建库至2023年5月5日的中医药治疗肝肾不足型RA的相关文献,利用R语言对处方进行药物频次、频率、性味归经、关联、聚类、相关分析的统计,分析得到核心药物。TCMSP数据库获取核心药物活性成分及靶点,取药物与RA交集靶点作为核心靶点,并进行基因本体（GO）功能和京都基因与基因组百科全书（KEGG）通路富集分析。构建药物-活性成分-核心靶点网络、蛋白质-蛋白质相互作用网络（PPI）,经分析得到核心成分、关键靶点,并进行分子对接验证。结果：筛选得到54首处方,共149味中药,这些中药多味甘,性温,归肝、肾经,得到48项关联规则,聚类分析发现3个新组方。核心药对与RA的交集靶点144个,分析得到29个活性成分,39个关键靶点。GO功能分析得到1013个结果,KEGG富集分析获得173条通路。分子对接结果示对接靶点与核心成分结合性较好。结论：中医药治疗肝肾不足型RA处方用药多以补肝肾、祛风湿、活血止痛为主,通过辨证配伍温肾阳、健脾益气、活血化瘀等药物。核心药对中的多个有效成分通过调控多靶点、多条通路治疗肝肾不足型RA。     

太子河断裂对鞍钢弓长岭尾矿坝稳定性的影响

进行尾矿坝的稳定性评价是地震安全性评价工作的一个重要方面,由于尾矿坝组成和结构的特殊性,断裂及地震活动对尾矿坝的稳定性有十分重要的影响。     

A BOUNDARY NESTING SCHEME OF LIMITED AREA MODEL NESTED WITH GLOBAL MODEL FOR FORECASTING TROPICAL CYCLONE OVER SOUTH CHINA SEA

Today, the nested model is used widely. The effect and role of each nested variate is analyzed in this paper. It is found that the forecast could benefit by nesting part of the variates and the effect of each of the variates may be different. Therefore, only the effectual variates are chosen for the nesting. According to this finding, a scheme is suggested and applied to the limited area mode (TL10) nested with global spectral mode (T63) for forecasting tropical cyclones over the South China Sea. A few numerical prediction tests show that this scheme is reasonable and efficient.     

四川盆地南北缘志留系的锶和碳、氧同位素演化及其地质意义

通过对四川盆地北缘广元地区及南缘綦江地区上奥陶统及下志留统地层的８７Ｓｒ／８６Ｓｒ、δ１３Ｃ及δ１８Ｏ的系统测定,取得了沿地层剖面变化的同位素组成规律。研究结果表明,在盆地南缘８７Ｓｒ／８６Ｓｒ值高于地质历史中海水的平均值,其原因是本区为受板块内古陆控制的缓坡环境,大量陆源锶的混入增加了８７Ｓｒ／８６Ｓｒ的值。８７Ｓｒ／８６Ｓｒ值在上奥陶统至下志留统地层交界处、Ｒｈｕｄｄａｎｉａｎ／Ａｅｒｏｎｉａｎ（鲁丹期／艾隆期）交界处具正峰波动,反映了此时海平面的短时下降。但从Ｒｈｕｄｄａｎｉａｎ至Ｔｅｌｙｃｈｉａｎ（特里奇期）,８７Ｓｒ／８６Ｓｒ逐渐降低。从Ａｅｒｏｎｉａｎ至Ｓｈｅｉｎｗｏｏｄｉａｎ（舍因伍德期）早期,盆地南北缘的δ１３Ｃ值处于逐渐上升的过程之中,而δ１８Ｏ则相反。同位素的演化特征说明本区当时为海进时期,海平面不断上升,与全球性海平面变化相吻合。由于受区域构造运动的作用,Ｓｈｅｉｎｗｏｏｄｉａｎ之后的全球持续海进对本区无影响。     

应用折射层析方法解决塔里木盆地浅部地震速度的分布

首次提出了用于解决塔里木盆地地震资料数据处理中浅部地震速度分析的折射层析成象方法。该方法可以通过求解任意变速介质中的二维程函方程、射线追踪和ＳＩＲＴ迭代解法实现。通过对塔里木盆地地震资料的层析反演取得了较好的结果,揭示了浅部地震速度具有较大的横向变化。这一变化对建立地下速度模型及反射构造成象有较大影响,钻井资料证实了这一结果。这项研究的成功对研究塔里木盆地地震波速度的变化规律及进一步提高该区整体地震资料处理与解释的质量具有重要的实际意义。