车载前视GPSAR序列图像浅埋目标检测新方法

由于浅埋小目标的雷达截面较小、埋设环境复杂,导致单帧检测结果中存在大量虚警,该文提出一种预筛选-交替后向跟踪-多帧确认目标检测方法。首先利用CFAR检测、形态滤波和聚类分析对图像进行预筛选;然后利用当前距离多视图像对应的聚类中心标记待跟踪的潜在目标,采用点跟踪搜索和块相关检测相结合的交替后向跟踪获得潜在目标轨迹;最后计算潜在目标轨迹的加权历史置信度,进行目标确认,剔除自然杂波。实测数据处理结果表明:该方法可快速、稳健地实现目标检测,明显减少虚警。     

研究包气带水分运移常用理论方法存在的问题浅议

该文对研究包气带水分运移常用的毛管势理论、土水势理论、层流理论和湿润锋面入渗理论存在的问题进行了综述。指出毛管势理论对土壤孔隙形状的概化严重失实 ,对水驱动力种类考虑的不够全面 ;土水势理论的问题出现在对理论的过分简化上 ;层流理论用于非饱和流既缺乏实验依据 ,也缺乏理论依据 ;湿润锋面入渗理论没有考虑土壤水优势流的影响。     

制革污泥机械强制通风堆肥工艺的研究

利用自然通风和机械强制通风堆肥工艺对制革污泥进行了堆肥试验研究,结果表明采用强制通风堆肥技术可使污泥堆在30天内基本达到腐熟,温度、通气完全满足要求,堆肥结束后其中有机质、N、P等养分含量均能达到堆肥的成品要求。     

苏式仓改建后机械通风准低温储粮

苏式仓经过改建后仓容增加到原来的3倍,双门、双窗、双顶、双墙的设计,配合机械通风降温,使堆高6－8m的粮温比原苏式仓低10－12℃,全年大部分时间保持在20℃以下,基本处于准低温状态,有利于储粮品质,达到既增加仓容,又改善储粮条件的目的。     

Characterization of Methane Emissions from Rice Fields in Asia. II. Differences among Irrigated, Rainfed, and Deepwater Rice

Methane (CH₄) emission rates were recorded automatically using the closed chamber technique in major rice-growing areas of Southeast Asia. The three experimental sites covered different ecosystems of wetland rice--irrigated, rainfed, and deepwater rice--using only mineral fertilizers (for this comparison). In Jakenan (Indonesia), the local water regime in rainfed rice encompassed a gradual increase (wet season) and a gradual decrease (dry season) in floodwater levels. Emission rates accumulated to 52 and 91 kg CH₄ ha^–1 season^–1 corresponding to approximately 40% of emissions from irrigated rice in each season. Distinct drainage periods within the season can drastically reduce CH₄ emissions to less than 30 kg CH₄ ha^–1 season^–1 as shown in Los Baños (Philippines). The reduction effect of this water regime as compared with irrigated rice varied from 20% to 80% from season to season. Methane fluxes from deepwater rice in Prachinburi (Thailand) were lower than from irrigated rice but accumulated to equally high seasonal values, i.e., about 99 kg CH₄ ha^–1 season^–1, due to longer seasons and assured periods of flooding. Rice ecosystems with continuous flooding were characterized by anaerobic conditions in the soil. These conditions commonly found in irrigated and deepwater rice favored CH₄ emissions. Temporary aeration of flooded rice soils, which is generic in rainfed rice, reduced emission rates due to low CH₄ production and high CH₄ oxidation. Based on these findings and the global distribution of rice area, irrigated rice accounts globally for 70–80% of CH₄ from the global rice area. Rainfed rice (about 15%) and deepwater rice (about 10%) have much lower shares. In turn, irrigated rice represents the most promising target for mitigation strategies. Proper water management could reduce CH₄ emission without affecting yields.     

基于GSM的矿井通风安全监测系统

针对煤矿通风系统的安全监测问题,提出基于GSM公网传输监测数据的方法,阐述了利用西门子公司的TC-35通信模块设计监测系统的原理,介绍了系统的总体设计方案和软件功能。     

谈制浆造纸污水处理工程设计

本文对我院设计的利用亚洲开发银行贷款进行建设的项目－广西贺县纸浆厂和云南思茅造纸厂污水处理工程作了简要介绍,并探讨了如何解决污水处理的有关问题。     

旋流闪速浮选法的研究Ⅱ.旋流分选器中气泡的运动规律

从另一角度对旋流闪这浮选进行了研究,以加入起泡剂的清水作为介质,对进行旋流分选器中的气泡进行了影响研究,观察和记录了旋 分顺中气泡的数量、大小、分布、运动轨迹以及分选水介质的液流现象,初步获得了对旋流分选器中气泡运动规律的直观认识,并观察了不同结构参数和操作作参数对旋分选器中气泡和液流现象的影响,直观地印证了旋流闪速浮选试验的结果。并为旋流分选器选择最佳的结构参数和操作参数提供了另一依据。２     

微孔曝气、卡鲁塞尔-2000型氧化沟工艺处理城市污水

结合某城市污水处理厂采用微孔曝气、卡鲁塞尔 -2 0 0 0型氧化沟工艺的工程实例 ,阐述了该工艺流程相对于其它工艺流程的优、缺点 ;分析了该工艺流程降解有机物及除磷、脱氮的基本原理 ;并提出了该工艺流程中各构筑物的主要设计参数及技术经济指标。     

新型高效圆形离心浮选机

新型高效圆形离心浮选机充分挥了湍流射流及离心－重力力场的作用,使其在矿浆充气,气泡矿化、浮选槽内矿浆流动形式、给料方式等方面独具特色,消除了常规浮选机中矿浆在浮选槽内的内循环,取消刮泡机构,降低了能耗,减轻了维修量。操作简便,入料级比宽,易于集中控制。实验室研究和工业性运性实验表明,该机在合适的工况条件下,可获得较好的分选指标,对于烟煤其可燃体回收率可达９０％左右,处理量可通过改变相应结构控制,处