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对2021年国内登记的化学农药新品种进行了分析,包括5个杀菌剂、1个杀虫剂和6个除草剂,对这些新品种的作用机制与特点、作用谱、适用作物和登记情况等进行了介绍. 相似文献
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分析了2022年国内新登记的农药品种,包括2个杀菌剂、1个杀虫/杀螨剂、3个除草剂、2个植物生长调节剂,详细介绍了新品种的作用机制与特点、作用谱、适用作物和登记情况。 相似文献
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<正>近日,一种名为"松毛虫赤眼蜂·松毛虫质型多角体病毒杀虫卡"的生物农药,获得了农业部农药检定所的审定和登记,这是首个获得国家登记的天敌生物农药产品。据农药检定所相关负责人介绍,在国外,赤眼蜂和病毒都是作为单一产品进行了登记。国内已有 相似文献
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论述了台湾生物农药的定义、登记相关法规及台湾生物农药的市场概况,台湾生物农药发展所遭遇的瓶颈,台湾政府鼓励生物农药发展所采取之措施,台湾百泰生物科技公司推广生物农药的经验. 相似文献
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折流杆换热器在压缩机级间冷却上的应用 总被引:4,自引:1,他引:4
一种新型的U形管式折流杆换热器已成功地替代了H22(Ⅲ)氮、氢压缩机的套管式冷却器。新设备的体积、重量和压降分别为原设备的1/6、1/4和1/3。分析介绍了这一新设备的特性及应用实例 相似文献
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尼龙66(PA66)盐在水中溶解度的准确计算是尼龙66 聚合过程模型化基础。选择UNIFAC 活度系数方法,针对PA66 聚合体系对组分进行基团划分,定义的新基团为羧基和氨基形成的缔合基团(-CH2COO-·+H3NCH2-)、羧基与其相邻的亚甲基(-CH2COOH)。利用PA66 盐-水的固液平衡实验数据以及PA66 盐的熔点和熔化焓,回归得到UNIFAC 模型的基团交互作用参数。基于构建的UNIFAC 物性模型预测了0~100℃范围内PA66 盐在水中的溶解度,与实验数据的平均相对误差为2.1%;采用该模型进一步计算工业操作条件(120℃)下的盐浓度,与Aspen 自带参数的UNIFAC 模型比较,其误差从20%左右降到5%以下。 相似文献
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综述了近年来中国塑料管道行业涌现的改性聚氯乙烯(PVC-M)管、双轴取向聚氯乙烯(PVC-O)管、耐热聚乙烯(PE-RT)管、β-PP-R管、超高相对分子质量聚乙烯(PE-UHMW)管等塑料管道新产品的研发和应用进展,介绍了塑料和金属复合管道及塑料和塑料复合管道的技术特点和应用领域。此外,对于一些新出现的塑料管道系统也做了详细的阐述,重点说明了它们和建筑应用技术结合的优势。最后,结合国家的产业政策,对中国塑料管道行业前景进行分析和展望。 相似文献
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V. V. Guliants J. T. Mullhaupt J. M. Newsam A. M. Gorman C. M. Freeman 《Catalysis Today》1999,50(3-4):661-668
A new grid-based algorithm developed at Molecular Simulations, and molecular dynamics method have been applied to modeling the locations of non-framework species in zeolites. This new method locates the energy minima for various frameworks and populates these sites with the non-framework species. The cation locations were predicted in dehydrated zeolite adsorbents and catalysts, such as Na88X, Ca48X, mixed cation zeolite 3A (K60Na36A), and Cu-mordenite (Si/Al=5.0) using only well-known framework structure models. Furthermore, the locations of benzene molecules in a supercage of zeolite Ca48X were correctly predicted via the application of the Monte Carlo docking and molecular dynamics methods.
These examples demonstrate that when the framework type is known, the new technique can provide a realistic initial structure input for the challenging task of solving crystal structures of zeolites containing non-framework species. 相似文献
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采用浸渍法制备了一系列具有不同CuO含量的Pd-CuO/Al2O3催化剂,并将其用于乙醇氧化反应,其结构与性质通过XRD、H2-TPR和NH3-TPD等手段进行分析。结果发现,催化剂的活性并不是随着CuO含量的增加而增强,Pd-1.0%CuO/Al2O3催化剂表现出最佳的活性,其点火温度和完全转化温度比Pd/Al2O3催化剂至少降低了50℃。与Pd/Al2O3催化剂相比,含CuO催化剂增强的衍射峰强度以及氢化钯分解峰的消失,说明Pd-Cu合金结构的形成有利于Pd、Cu物种之间的协同作用。对于Pd-1.0%CuO/Al2O3催化剂来说,还原峰向低温的移动以及还原峰面积的增大说明该催化剂上氧化性物质更易被还原且数量在增加,这对于氧化反应是十分有利的,新出现的还原峰表示Pd、Cu的相互作用生成了新物种。NH3-TPD结果中更高含量的低温酸有利于高活性,而且新出现的脱附峰说明形成了新的酸性位点。 相似文献
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Eloise A. Pugar John H. Kennedy Peter E. D. Morgan John R. Porter 《Journal of the American Ceramic Society》1988,71(6):288-C
Subsolidus-phase studies in the calcium-silicon-oxygen-nitrogen system have been conducted using the reactive precursors calcium nitride, calcium oxide, and silicon nitride. A new structure has been isolated with a large, face-centered cubic lattice, a=1.4864 nm, which coexists with several new CaSiON phases as well as Ca3 Si2 O4 N2 and the unknown "D' phase, reported previously by other workers. The new structure is not isotypic with any known mineral oxide. The highest degree of phase purity has been obtained using a 1.1 calcium nitride:silicon nitride starting mixture. Structural and approximate compositional analyses were conducted by X-ray diffraction and TEM energy dispersive spectroscopy. 相似文献
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Biprodas Dutta Robert H. Magruder III Robert A. Weeks Donald L. Kinser 《Journal of the American Ceramic Society》1990,73(4):938-941
Thermally stimulated polarization and depolarization current (TSPC/TSDC) measurements were made on lead halide silicate glasses having compositions (65 − x )PbO· x PbX2 ·35SiO2 where x = 0, 0.1, 2, 10 and X = F, CI, Br, and I. The addition of halogen ions to lead silicate glasses gives rise to a new high-temperature TSDC peak in the vicinity of the peak previously observed in binary lead silicate glasses. The integrated area of the new peak is dependent on the amount and type of halogen ion present in the glass and does not saturate in the temperature range of our measurements. This new peak is attributed to space charge polarization of halogen ions. 相似文献