D-S证据理论在数据融合中失效问题的研究

D S方法作为一种重要的处理不确定性问题的数据融合方法,已经广泛应用于各种数据融合系统中。解决D S融合公式在处理冲突证据时的失效问题一直是研究的热点。国内外的各种改进方法主要分为对融合公式的改进和对融合模型的改进2个方向。对各种方法进行理论上和数据上的比较分析表明:修改模型的方式效果明显优于修改融合公式。     

关于电算化“甩帐率低”的解决办法

０引言现在企业中应用的财务软件不外乎两种情况：一种是商业化财务软件，另一种是结合单位实际情况开发的财务软件。二者在帐务处理上基本是按照现行财务制度要求设计的，但普遍存在“甩帐率低”的问题。究其原因主要有以下两方面：一是初始化工作不够规范，二是电算化记...     

Kilogram-scale synthesis of Mg-Al-CO3 LDHs nanosheets using a new two-stage reactor

A novel reactor with a two-stage reaction chamber was designed to kilogram-large-scale synthesized Mg-Al-CO₃ layered double hydroxide (Mg-Al-CO₃ LDHs) nanosheets. The effects of the reactant concentration and rotation speed of the dynamic structure on the crystal size and morphology were investigated. The results show that the size of Mg-Al-CO₃ LDH particles gained in typical condition is about 50 nm in length and 5.7 nm in thickness, and the size becomes larger as the reactant concentration or rotationl speed decreased. The possible reaction mechanism was explained by three critical factors of the reactor, N₂ gas and polyethylene glycol 2000.     

钢塑复合冲淤管的开发与应用

针对当前围堰造地与环境保护之间出现的问题,开发了一种钢塑复合冲淤管。经过工程试验证明这是一种切实可行的新技术,使用该产品做成的冲淤坝具有很好的冲淤能力。该产品的推广使用可减小围堰造地对环境的影响,加快冲淤速度,缩短围堰造地周期,节约造地成本。     

Nucleation Regulation and Anchoring of Halide Ions in All-Inorganic Perovskite Solar Cells Assisted by CuInSe2 Quantum Dots

Ionic feature of halide perovskites may lead to the formation of defect states in the polycrystalline films, which can deteriorate the device performance. To solve this issue, a low-temperature seed-assisted growth method can contribute to defect-passivated CsPbI_1.2Br_1.8 perovskite films by introducing CuInSe₂ quantum dots (QDs). As a result, the migration channels inside perovskite grains can be obviously suppressed, but few positive effects on the ions migration in grain boundaries. Conversely, this appearance demonstrate that the location of CuInSe₂ QDs is grain interior, but not grain boundary. Meanwhile, the lower defect density can help promoting device efficiency from 8.97% to 10.26%, which is among the high-efficiency level. Besides, this work can also provide an in-depth insight into the issue of photoinduced halide segregation.     

霞家河灌区续建配套与节水改造工程规划与研究

霞家河灌区是以一座中型水库为主要水源,利用灌区内小型水库、塘堰作调节,通过干渠相互沟通形成的长藤结瓜式灌溉系统,运行以来社会、经济效益巨大,但也存在工程布局不合理、水资源分配不优、工程老损失修等问题。在此提出了霞家河灌区续建配套与节水改造工程规划设计,同时对灌区工程规划设计的可行性进行了研究分析。     

加筋土路堤整体稳定的可靠指标分析

利用可靠度理论,结合工程实例,对加筋土路堤整体稳定可靠指标进行分析。认为设计参数均值与变异性对加筋土路堤整体稳定都有不同程度的影响;当设计参数数量有限而无法准确确定其所服从的概率模型时,建议假定填土的重度服从极I型分布,而粘聚力、内摩擦角和筋材拉力服从正态分布,所得到的结果偏于安全;另外对筋材层数、间距和整体稳定计算模式与加筋土路堤整体稳定的可靠指标之间的关系进行了探讨,所得出的结论可为加筋土路堤设计提供参考。     

天然裂缝性储层的特征

天然裂缝性储层给开采带来了一个矛盾难题。这类储层包括低油气采收率储层,这些储层最初可能表现出高产,但产能下降得非常快。此外,这类储层还经常出现早期见气或见水等问题。而另一方面,一些天然裂缝性储层也是全球最大、产量最高的储层。这类储层的这种矛盾特性激发业界尽力去深入了解其特征,以便更有把握地对其进行模拟分析。     

Geotechnical properties of the soft soil in Guangzhou College City

The paper describes some geotechnical properties of the soft soils in Guangzhou College City, China, which are difficult to both sample and test. Laboratory and in situ tests were carried out to assess the physical and mechanical indices of the soils. The data were statistically analyzed and linear regression undertaken such that equations could be developed by which the geotechnical properties of the soft soils can be predicted. The statistical validity of the degree of correlation confirmed that using these equations, the mechanical indices can be estimated from physical indices determined by routine testing.