我国乡办村办企业产权制度变革研究

在考察乡办村办企业发展历程的基础上，说明了产权制度变革问题提出的背景；介绍了乡办村办企业产权制度变革的研究现状；对目前研究现状进行了评论，提出了乡办村办企业产权制度变革的目标模式为准股份制。     

辣椒新品种‘新椒23号’

 辣椒新品种‘新椒23号’为中早熟一代杂种。植株生长势较强,果实长羊角形,纵径24.4 cm,肩横径2.98 cm,肉厚1.92 mm,平均单果质量42.3 g。皮薄,肉质脆,辣味适中。较抗病毒病,耐疫霉病。     

铺装机运行速度的电液比例补偿控制

介绍了一种压力补偿与速度反馈闭环补偿相结合的铺装朵电液比例闭环速度控制系统，较好地解决了铺装机运行速度不稳定的问题，详细叙述了系统组成及工作原理，并且给出了微分改进型PID数字控制器算法。     

两级电液伺服位置控制研究

为解决大负载、长行程位置控制系统中不能同时满足伺服缸活塞杆工作行程与控制精度的问题,提出了速度开环控制加传统的位置闭环控制的控制策略。在速度开环控制中比例调速阀控制调速缸,解决了工作行程不能太大的问题;在位置闭环控制中比例伺服阀控制伺服缸,解决了控制精度低的问题。此外为了解决设定位移经常变动和超调量过大问题,在位置闭环控制系统的PID控制器中分别采用了微分先行和积分分离控制算法。仿真结果验证了该策略的可行性与有效性。     

The Application of Fuzzy Multicriteria Decisions Theoryin Evaluation of Construction Cost of Civil Engineering

A new method Based on Fuzzy Mathematics for evaluating Construction cost ispresented here. By dividing the civil engineering into a series of engineering characters and quantify-ing them. The weighted Hamming Distance between builded engineerings and engineering to bebuilded has been ealculated with the help of Multicriteria Decisions Theory,and Based on that ,theconstruction cost of later engineering has been evaltlated.     

轻型高压直流输电功率控制器的设计

轻型高压直流输电系统(HVDC Light)具有广阔的应用前景,为实现HVDC Light输送有功、无功功率的独立控制,建立了在同步旋转d～q坐标轴下系统的数学模型,设计了双闭环解耦控制方案,并重点介绍了电流内环和功率外环比例积分(PI)调节器的设计以及参数整定方法.最后利用仿真软件Matlab/Simulink对HVDC Light系统的功率控制进行仿真分析,验证了数学模型的正确性和功率控制器的有效性.     

大白菜新品种晋白菜8 号的选育

晋白菜8 号为中晚熟大白菜品种,生育期88 d（天）左右。亲本之一HY219 是来源于河北
唐山地区的农家品种,经多代自交选育而成的自交不亲和系;另一亲本H226 是来源于天津农家品种天津
核桃纹的自交后代。该品种生长势强,外叶及叶柄浅绿色,叶球为直筒拧心型。株高65 cm,开展度 64
cm,单株质量5 kg 左右。外叶少,净菜率高达80% 以上。田间调查表明对霜霉病和软腐病的抗性高于对
照太原二青。耐贮性强,商品品质好,叶片叶脉少,粗纤维含量少。每667m² 净菜产量8 500 kg 左右,可
在全国适合直筒型大白菜种植区域栽培。     

甘蓝一代杂种S 单元型的分布

利用SRK 基因激酶区的3 对特异性引物,对23 份甘蓝一代杂种进行PCR 扩增,经过克隆测
序、Blast 分析初步鉴定甘蓝一代杂种的S 单元型。结果表明：供试23 份材料中共出现了11 个S 单元型,
分别是S7、S16、S28、S35、S45、S57、S68 和未知的Sn 等8 个Ⅰ类S 单元型及S2、S5、S15 等3 个Ⅱ
类S 单元型。其中,Ⅱ类S 单元型的S5 出现频率最高,达到19.6%;其次为Ⅰ类S 单元型的S28,达到
17.4%。相比甘蓝类作物中存在的50 多个S 单元型而言,本试验材料涉及的S 单元型并不多,预示在遗传
育种中利用更多的S 单元型是十分必要的。     

Soil organic carbon and nitrogen fractions and water‐stable aggregation as affected by cropping and grassland reclamation in an arid sub‐alpine soil

This paper investigates effects of cropping abandonment and perennial grass growing on soil organic C and N pools and aggregate stability, by comparing soils under native grassland, crop cultivation, perennial grass growing and cropping abandonment, in degraded cropland at a sub‐alpine site in north‐western China. The pools of total and particulate organic C (115 and 37 Mg ha⁻¹) in the 0–30 cm soil layer of native grassland were reduced by 31 and 54% after 30 years of crop cultivation. After 4 years of conversion from cropland to perennial grass growing total and particulate organic C pools were increased by 29 and 56%, whereas 4 year cropping abandonment increased particulate organic C by 36%. Rapid increases in total and particulate N were also found in perennial grass growing and cropping abandonment soils. The native grassland soil and soils of cropping abandonment and perennial grass growing had higher carbohydrate C concentrations in the 0–10 cm layer than the cropped soil. The rapid recovery of particulate organic fraction and carbohydrates in the re‐vegetated soils were probably due to higher plant biomass inputs and lower organic matter decomposition compared with those in the cropped soil. Aggregate stability of the 0–30 cm soil layer was significantly decreased by crop cultivation but showed a good recovery after 4 year re‐vegetations. This study suggests that reduction of soil organic matter and aggregate stability under crop cultivation may be remedied by cropping abandonment or perennial grass growing. Copyright © 2008 John Wiley & Sons, Ltd.     

大果型辣椒新品种周椒201的选育

周椒201是以P0521为母本、以SP0598为父本配制而成的大果型辣椒一代杂种。植株长势中等,株高56.75 cm,开展度62.30 cm,始花节位第8.08节,果实纵径15.25 cm,果肩宽4.70 cm,单果质量86.97 g。果实牛角形,商品成熟果绿色,有光泽,果实整齐匀称,商品性好,结果早,连续结果能力强,田间调查结果表明对炭疽病、疫病和病毒病的抗性与对照墨秀301相当。一般每667 m²产量3 500 kg左右,适宜河南省及其周边地区保护地和露地栽培,也可作秋延后栽培。