以尿素为氮源的高氮复合肥生产技术

笔者根据多年的实践经验 ,阐述以尿素为氮源 ,生产高氮〔w(N)≥ 2 0 %〕复肥的现实意义及生产技术要点 ,具体介绍 2个高氮复肥 (2 30 7)、(2 0 10 15 )的配方实例及操作要点     

FT1500处理器中仿真驱动的DDR3封装设计

针对高性能微处理器封装中DDR3的信号完整性和电源完整性问题,提出了仿真驱动的封装设计方法：在设计之初通过前仿真制定准确的设计规则和目标,在设计过程中通过仿真指导设计优化,在设计完成后用后仿真验证设计结果。应用该方法设计了FT1500芯片封装,实测结果表明,该芯片的DDR3接口可以稳定工作在1400Mbps。     

PVA凝胶纺丝工艺对纤维结构与性能的影响

讨论了聚乙烯醇（ＰＶＡ）凝胶纺丝过程中的凝固浴、初生冻胶丝的溶剂萃取和干燥收缩以及干冻胶丝超拉伸、热定型等工艺条件对ＰＶＡ纤维结构和性能的影响，并制备出拉伸强度和模量分别为１１．３和４３０ｃＮ／ｄｔｅｘ的高强高模ＰＶＡ纤维。     

The use of electrochemical noise methods (ENM) to study thick, high impedance coatings

Thick, high impedance organic coatings are those class of coatings used to provide corrosion protection to naval vessels, pipelines, gasoline storage tanks, and other large structures such as bridges and plant structures. These coatings, especially the newest generations now being used in practice, can provide exceptional protection and lifetime of performance such that properly and accurately assessing and differentiating among competing coatings is a very difficult task. The standard protocol of salt fog testing (ASTM B117), immersion testing, and outdoor exposure in a corrosive environment with subjective evaluation of a coating's performance durings and after testing, does not adequatcly rank and predict coating lifetimes for new coating systems, especially for the environmentally compliant coating systems such as powder coatings (especially the thick, fusion bonded epoxy (FBE) coatings used for pipelines), two component epoxy and urethane coatings and waterborne coatings. New, objective test methods are desperately needed by users and manufacturers of coatings. A relatively new electrochemical test procedure, electrochemical noise methods (ENM), as developed by Skerry and Eden, has been shown in our laboratory to be very successful in the ranking and prediction of relative coating performance. We have used the method successfully on naval ship coatings, several pipeline coatings and other related systems, and Skerry has used them successfully on industrial maintenance coatings. We have used these methods in conjunction with electrochemical impedance spectroscopy, d.c. resistance measurements and cyclic salt fog testing of the Prohesion^TM type. In our studies of pipeline coatings, we needed to investigate thermal effects because of their extended range of use temperature. In these studies, we have discovered that electrochemical methods can be used for an in situ measurement of the T_g of coatings in electrolyte immersion. Further, the ‘plasticizing’ effect of aqueous electrolyte absorption as well as its relative irreversibility has been shown. For all coatings studied, ENM provided useful, objective, numerical data which rapidly ranks coatings and provides useful information on the relative lifetime prediction of coatings which may provide up to 30 years of service.     

高温快烧釉中彩颜料的研究

为解决日用瓷铅镉溶出问题和提高装饰档次，研制成功１８种高温快烧颜料色基及专用熔剂。经测试，１８种颜料的各项指标全部达到国家标准要求，铅镉溶出量全部为０．０ｍｇ／ｄｍ２．     

二氰基取代的四硫富瓦烯硫杂冠醚衍生物的合成及性质研究

在甲苯溶液中,在亚磷酸三乙酯存在下,采取高度稀释的方法,使4,5-二氰基-1,3-二硫杂环戊二烯-2-酮分别和多缩硫杂冠醚进行交叉偶联反应,成功地得到了不对称的2,3-二氰基四硫富瓦烯衍生物。用1HNMR、MSI、R和EA表征了其结构,并用循环伏安法研究了它们的电化学性质,用1HNMR初步评价了衍生物对钠离子的配合性能。     

Root growth and phosphorus and potassium uptake by two corn genotypes in the field

In a field study P and K uptake by two corn (Zea mays L.) genotypes which differed in root growth was investigated. The effect of differences in root growth on P and K uptake was assessed using a mechanistic-mathematical model which describes nutrient uptake by growing plant roots in soil. Nitrogen was applied at 0 and 227 kg ha^–1 to Pioneer 3732 and B73xMo17 corn grown on Raub silt loam (fine-silty, mixed, mesic Aquic Argiudoll) and at 227 kg N ha^–1 to these two genotypes on Chalmers silt loam (finesilty, mixed, mesic, Typic Haplaquoll). Root growth and P and K uptake by the two corn genotypes was measured 31, 47, 75 and 91 d after planting on the Raub and 31, 47, 61 and 75 d after planting on the Chalmers soil.Root growth and P and K uptake by B73xMo17 was greater than that of Pioneer 3732 on N-fertilized Raub soil. On Chalmers soil the difference in root growth between the two genotypes resulted in an increase in K but not P uptake. The higher soil P level of the Chalmers appears to have offset possible differences in P uptake due to root size. There were no differences between the two genotypes in either the percentage of roots with root hairs, or the density or length of root hairs. Phosphorus and K uptake calculated with the simulation models for both corn genotypes on both soils over each of three growth periods agreed with observed P (Y = 0.68X + 1.71; r = 0.944^**) and K (Y = 0.88X + 15.52; r = 0.928^**) uptake. Differences in P and K uptake between B73xMo17 and Pioneer 3732 resulted primarily from the difference in root growth in the topsoil. A high correlation was found between root surface area and P (r = 0.893^**) and K (r = 0.928^**) uptake by both corn genotypes on both the soils.Journal paper No. 10,316 Purdue Univ. Agric. Exp. Stn., W. Lafayette, In 47906. Contribution from the Dep. of Agron. This paper was supported in part by a grant from the Tennessee Valley Authority.     

A novel low-noise high-linearity CMOS transmitter for mobile UHF RFID reader

A novel CMOS transmitter with low TX noise and high linearity is implemented in a 0.18μm 1P6M standard CMOS process for Mobile UHF RFID reader.Adopting double-sideband amplitude-shift-keying(DSBASK)as the only modulation is supported,this transmitter has very low power consumption.A novel analog baseband circuit is proposed to reduce the transmitter noise.With a G′′m–cancellation technology,a highly linear up-conversion active mixer and a power amplifier driver are designed.The transmitter has a measured output1 dB compression point of 13.4 dBm.Occupying a silicon area of about 1 mm2and consuming 144 mW from a1.8 V voltage supply,the transmitter makes the Mobile UHF RFID reader communicate with a transponder in a distance of 1 m conveniently.     

一种白光测速仪在热锯区域中的应用

阐述白光测速仪的工作原理及优缺点,介绍其在莱钢大H型钢生产线热锯区域的应用.     

连续高速电镀技术在集成电路引线框架生产中的应用

介绍了集成电路引线框架镀层特点及其卷对卷式连续高速局部电镀银技术。分析了高速镀银工艺条件，并与传统氰化物镀银工艺进行了比较。简单介绍了局部电镀技术的原理及方法。