《麻雀》的多种教法

《麻雀》(五年制语文第六册第7课,六年制语文第六册第28课),是三年级的一篇讲读课文,是一篇用之经久的传统教材。课文叙述了一只老麻雀在猎狗面前,奋不顾身地保护小麻雀的故事。故事的情节很简单。开头讲猎狗放慢脚步,好像闻到什么野物,接着讲看到了一只刚从巢里掉下来的小麻雀,猎狗刚张开嘴巴,突然,一只老麻雀飞下来,落在猎狗面前,绝望垃尖叫。老麻雀用自己的身体,掩护小麻雀,猎狗慢慢地后退,被“我”带走了。故事不难理解。

浙江省池塘内循环流水养殖技术协作组现场交流会在湖州召开

日前,浙江省池塘内循环流水养殖技术协作组现场交流会在湖州南浔召开,协作组成员及特邀代表共40余人参加会议,湖州市农业局副局长陶忠华参会并致辞,协作组组长何中央研究员主持会议。会议对今年各试验点的养殖情况进行了简要小结,分析了存在的问题,提出了下一步的工作计划。从今年各试验点的生产情况来看,效益普遍较好,全省养殖水槽从2015年开始试验的12条,到今年年底建成共约170条，预计明年将超过360条，较今年增长一倍多。

德国职教的“七圈半精神”

近日与德国职业教育专家聊起一个故事:中国一著名企业引进一批德国设备,装配说明书上写明某处螺钉要拧七圈半。中国技工实际装配时有时拧七圈,有时拧八圈,认为两种做法的紧固程度差不多。德国人说那不行,规定七圈半就得七圈半,这是德国本土设备装配长期总结的最佳紧固度。这个故事本来只是我采访时用来活跃气氛的一个段子。

Comparison of different land-surface perturbation methods in short-range ensemble forecasts

In order to compare the sensitivity of short-range ensemble forecasts to different land-surface parameters in the South China region,three perturbation experiments related to the land surface model(LSM),initial soil moisture(ISM),and land–atmosphere coupling coefficient(LCC)were designed,and another control experiment driven by the Global Ensemble Forecast System(GEFS)was also performed.All ensemble members were initiated at 0000 UTC each day,and integrated for 24 h for a total of 40 days from the period 1 April to 10 May 2019 based on the Weather Research and Forecasting model.The results showed that the perturbation experiment of the LSM(LSMPE)had the largest ensemble spread,as well as the lowest ensemble-mean root-mean-square error among the three sets of land-surface perturbed experiments,which indicated that it could represent more uncertainty and less error.The ensemble spread of the perturbation experiment of the ISM(ISMPE)was generally less than that of LSMPE but greater than that of LCCPE(the perturbation experiment of the LCC).In particular,although the perturbation of the LCC could not produce greater spread,it had an effective influence on the intensity of precipitation.However,the ensemble spread of all the land-surface perturbed experiments was smaller than that of GEFSPE(the control experiment).Therefore,in future,land-surface perturbations and atmospheric perturbations should be combined in the design of ensemble forecasting systems to make the model represent more uncertainties.

Estimating Field Source Parameters of Gravity Change in North China Based on the Euler Deconvolution Method

Based on the absolute and relative gravity observations in North China from 2009 to 2014,spatial dynamic variations of the regional gravity field are obtained. We employed the Euler deconvolution method and the theoretical model to get the best estimates of parameters. Gravity field change caused by the depth and distribution in North China is calculated by back analysis. The results show the structural index that equals 1 is suitable for inversion of the gravity variation data. The inversion results indicate that the depths of anomaly field sources are spread over the Hetao fault. The research method of this paper can be used in the quantitative study on the field source and may shed new light on the interpretations of gravity change, and also provide quantitative basis for earthquake prediction index criterions based on the gravity change.

Impact Assessment of Climate Change on Algal Blooms by a Parametric Modeling Study in Han River

The potential impact of climate change on international and domestic concern. This study aims water eutrophication and ecosystems is of great to analyze the impact of climate change on algal bloom problems in large river systems by utilizing a parametric river eutrophication model that is established using indicators of climate change, hydrological regimes, water quality and nutrient loads. Specifically, the developed parametric modeling method is based on statistical and simulation methods including： Multiple Linear Regressions （MLR）, Multiple Non-linear Regressions （MNR）, Artificial Neural Network （ANN） based on Back-propagation （BP） algorithms, as well as an integrated river eutrophication model. The developed model was applied to Han River, which is one of the major sources of fresh water in Wuhan City, China. The impacts of climate change and human activities on the occurrence mechanisms of algal blooms in the Hart River were identified by scenarios analysis. The individual assessment result indicates that the waste nutrient P load has the most significant impact （14.82%）, followed by the flow rate （5.56%） and then by temperature （3.7%）. For the integrated climate change assessment, it has been found that there is a significant impact （20.37%） when waste load increases and flow rate decreases at the same time. This is followed by increases but flow rate decreases, increase of both waste load and the impact is predicted to be 11 temperature （15.82%）. If temperature 11%. The final results point to human activities as a significant influence on water quality and the Han River ecosystem, temperature is also one of the main factors which directly contribute to algal blooms in Han River. The results in present study are expected to give theoretical supports for further relevant research on water eutrophication.

Wintertime N2O5 uptake coefficients over the North China Plain

The heterogeneous hydrolysis of dinitrogen pentoxide(N2O5)plays an important role in regulating NOx.The N2O5 uptake coefficient,γ(N2O5),was determined using an iterative box model that was constrained to observational data obtained in suburban Beijing from February to March 2016.The box model determined 2289 individualγ(N2O5)values that varied from<0.001 to 0.02 with an average value of 0.0046±0.0039(and a median value of 0.0032).We found the derived winterγ(N2O5)values in Beijing were relatively low as compared to values reported in previous field studies conducted during winter in Hong Kong(average value of 0.014)and the eastern U.S.coast(median value of 0.0143).In our study,field evidence of the suppression ofγ(N2O5)values due to pNO3-content,organics and the enhancement by aerosol liquid water content(ALWC)is in line with previous laboratory study results.Low ALWC,high pNO3-content,and particle morphology(inorganic core with an organic shell)accounted for the lowγ(N2O5)values in the North China Plain(NCP)during wintertime.The field-derivedγ(N2O5)values are well reproduced by a revised parameterization method,which includes the aerosol size distribution,ALWC,nitrate and organic coating,suggesting the feasibility of comprehensive parameterization in the NCP during wintertime.

顧愷之及其作品

東晉時代的畫家顧愷之,是中國歷史上第一個被當作藝術家,成爲可喜可愛,被稱頌的人物的。他的活躍的時期在四世紀的後半,去嵇康、阮藉的時代不遠,而嵇康、阮藉是以他們的狂放激越的行爲和言論表現了對於漢代以來疆死的虚僞的禮教的反對態度。所以,顧愷之一方面用圖畫細心摹描着這些前代名士的風神氣骨,一方面,他自己在生活實踐上也同樣表現了一種天真的、有風趣的性格。