潍坊市盆花消费现状调查

小盆径盆花因其价格低、体量小,越来越受到消费者的欢迎。通过对潍坊市居民消费小盆径盆花的情况进行调查,结果表明,小盆径盆花比大盆径盆花受欢迎,栽植盆器精美的小盆径盆花比用一般盆器栽植的盆花受欢迎。因此,发展小盆径盆花的生产与销售,是盆花生产的方向。

三维超声在诊断女性盆底功能障碍中的应用

目的探讨三维超声在诊断女性盆底功能障碍中的应用情况方法以2017年4月至2019年4月于本院进行三维超声检查的盆底功能障碍患者55例为观察组,按照配比同期选择55例经体检显示正常的健康者为对照组。分析盆底功能障碍患者的三维成像特点,比较其检出率。结果(1)静息状态下两组LHAP比较差异无统计学意义(P>0.05),但观察组LA(16.83±3.37)cm^2、LHIP(3.84±0.77)cm均显著高于对照组(13.64±2.73)cm2、(3.38±0.62)cm(P<0.05);最大Va1sa1va动作下,观察组各指标均显著高于对照组(P<0.05)。(2)静息状态下,观察组中阴道分娩患者于剖宫产分娩患者的LHAP、LA、LHIP比较差异均无统计学意义(P>0.05),但最大Va1sa1va状态下,阴道分娩患者的各指标依次为(7.53±1.69)cm、(19.45±3.31)cm^2、(4.22±0.47)cm,均显著高于剖宫产组(6.02±1.14)cm、(18.23±2.67)cm^2、(4.02±0.36)cm(P<0.05)。结论经会阴三维超声检查能够为女性盆底功能障碍性疾病提供有效信息,具有较高的临床应用价值。

The complex nonlinear systems with fractal as well as chaotic dynamics of annual runoff processes in the three headwaters of the Tarim River

This paper attempted to identify fractal and chaotic characteristics of the annual runoff processes in headwaters of the Tarim River.Methods of fractal analyses were used to explore several aspects of the temporal changes from 1957 to 2002.The main findings are as follows:(1) The annual runoff processes of the three headwaters of the Tarim River are com-plex nonlinear systems with fractal as well as chaotic dynamics.(2) The correlation dimensions of attractor derived from the time series of the annual runoff for the Hotan,Yarkand and Aksu rivers are all greater than 3.0 and non-integral,implying that all three rivers are chaotic dynamical systems that are sensitive to initial conditions,and the dynamic modeling of their annual runoff process requires at least four independent variables.(3) The time series of annual runoff in each river presents a long-term correlation characteristic.The Hurst exponent for the period of 1989 to 2002 suggests that we may expect to see an increasing trend in the annual runoff of the Aksu and Yarkand rivers in the years after 2002,but a decreasing tendency for the Hotan River in the same period.

Development of a Cell-based Model to Derive Direct Runoff Hydrographs for Ungauged Mountainous Basins

A model to derive direct runoff hydrograph for an ungauged basin using the physical properties of the basin is presented. The basin is divided into grid cells and canal elements. Overland flow is generated from each grid cell of the basin by application of continuous effective rainfall of I mm/hr to the basin, The flow generated is routed through downstream grid cells and the canal elements using the kinematic wave approach. The travel time for direct runoff from each grid cell to the basin outlet is calculated and the S-curve is derived for the basin. The S-curve is used to derive the unit hydrograph of a given duration for the basin. The model, referred as Cell-basin model was applied to the Upper Kotmale Basin in Sri Lanka and the model predictions of direct runoff hydrographs for rainfall events agreed with the observations to a reasonable accuracy. Comparison of the unit hydrographs obtained from the model and from the conventional Snyder＇s synthetic unit hydrograph using regionalized parameters assuming the basin as an ungauged basin, with the unit hydrograph derived from the observations showed that the model predicted unit hydrograph was more suitable than that obtained by Snyder＇s method for Sri Lankan up country basins. Thus, the present model is a useful tool to obtain direct runoff hydrograph for ungauged basins.

Stormwater Runoff Pollution in a Rural Township in the Hilly Area of the Central Sichuan Basin,China

Stormwater runoff in rural townships has a high potential for water quality impairment but little information is available on strormwater runoff pollution from rural townships.To investigate the characteristics of runoff pollution in a rural township,a catchment(2.32 ha) in Linshan Township,Sichuan,China was selected to examine runoff and quality parameters including precipitation,flow rate,and total nitrogen(TN),dissolved nitrogen(DN),total phosphorus(TP),dissolved phosphorus(DP),particulate phosphorus(PP),chemical oxygen demand(COD) and suspended solid(SS) in 12 rainfall events occurring between June 2006 and July 2007.Results show that the annual pollutant loads were 47.17 kg ha-1 for TN,6.64 kg ha-1 for TP,1186 kg ha-1 for COD,and 4297 kg ha-1 for SS.DN and PP were the main forms of nitrogen and phosphorus in stormwater runoff.TP,COD and SS showed medium mass first flushes,in which nearly 40% of the total pollutant masses were transported by the first 30% of total flow volume.The peak of pollutant concentration appeared before the peak of runoff due to the first flush of accumulative pollutants in impervious areas and drainage ditches.The EMC values of TN,TP,DN and PP were negatively correlated to the maximum rainfall intensity,precipitation,total flow volume,and runoff duration(P<0.05,n=12),while EMC of COD and SS were not related to any rainfall characteristics.The FF30(FF,First Flush) for TN,TP,COD and SS were positively correlated to the maximum rainfall intensity(P<0.05,n=12),and TP was also positively correlated to the average rainfall intensity(P<0.05,n=12),indicating that the magnitude of first flush increased with the rainfall intensity in the Linshan Township.

Spatial and Temporal Variability of Water Availability in the Yellow River Basin

The changes in hydrological processes in the Yellow River basin were simulated by using the Community Land Model(CLM,version 3.5),driven by historical climate data observed from 1951 to 2008.A comparison of modeled soil moisture and runoff with limited observations in the basin suggests a general drying trend in simulated soil moisture,runoff,and precipitation-evaporation balance(P-E) in most areas of the Yellow River basin during the observation period.Furthermore,annual soil moisture,runoff,and P-E averaged over the entire basin have declined by 3.3%,82.2%,and 32.1%,respectively.Significant drying trends in soil moisture appear in the upper and middle reaches of the basin,whereas a significant trend in declining surface runoff and P-E occurred in the middle reaches and the southeastern part of the upper reaches.The overall decreasing water availability is characterized by large spatial and temporal variability.

园艺中心提升植物售价的机会在哪里

2020-2021年,加拿大威士兰(Vineland)研究与创新中心与加拿大圭尔夫大学(University of Guelph)合作,对美国和加拿大的消费者开展了一项为期两年的线上线下购买行为研究。该研究得到了加拿大苗圃和景观协会(CNLA)的支持和指导,由花卉营销基金(The Floral Marketing Fund)赞助。在今年1月27日的一场网络研讨会上研究结果公布:对那些在园艺中心购买植物的消费者来说,价格往往是事后才考虑的。