山地城市特色塑造与规划控制

随着我国城市的快速发展,城市特色形象问题逐渐成为人们关注的焦点。控制性详细规划作为衔接总体规划与修建性详细规划的关键环节,在塑造城市特色方面也起到举足轻重的作用。本文以腾冲县玛御谷温泉北片区控制性详细规划为例,从地形环境的分析入手,以具有山地城市特色的台地系统、道路系统和绿地系统为规划的重点,探讨控制性详细规划阶段,基于山地地形特征的城市特色塑造与规划控制。     

Ventilation rates in large commercial layer hen houses with two-year continuous monitoring

1. Ventilation controls the indoor environment and is critical for poultry production and welfare. Ventilation is also crucial for assessing aerial pollutant emissions from the poultry industry. Published ventilation data for commercial layer houses have been limited, and are mostly based on short-term studies, mainly because monitoring airflow from large numbers of fans is technically challenging.

2. A two-year continuous ventilation monitoring trial was conducted at two commercial manure belt houses (A and B), each with 250?000 layers and 88 130-cm exhaust fans. All the fans were individually monitored with fan rotational speed sensors or vibration sensors. Differential static pressures across the house walls were also measured. Three fan performance assessment methods were applied periodically to determine fan degradations. Fan models were developed to calculate house ventilations.

3. A total of 693 and 678 complete data days, each containing >16?h of valid ventilation data, were obtained in houses A and B, respectively. The two-year mean ventilation rates of houses A and B were 2·08 and 2·10?m³?h^?1?hen^?1, corresponding to static pressures of ?36·5 and ?48·9?Pa, respectively. For monthly mean ventilation, the maximum rates were 4·87 and 5·01?m³?h^?1?hen^?1 in July 2008, and the minimum were 0·59 and 0·81?m³?h^?1?hen^?1 in February 2008, for houses A and B, respectively.

4. The two-year mean ventilation rates were similar to those from a survey in Germany and a 6-month study in Indiana, USA, but were much lower than the 8·4 and 6·2?m³?h^?1?hen^?1 from a study in Italy. The minimum monthly mean ventilation rates were similar to the data obtained in winter in Canada, but were lower than the minimum ventilation suggested in the literature. The lower static pressure in house B required more ventilation energy input. The two houses, although identical, demonstrated differences in indoor environment controls that represented potential to increase ventilation energy efficiency, and reduce carbon footprints and operational costs.     

森林病虫害发生的原因及综合防治

分析森林病虫害发生的原因及病虫害综合防治的措施。     

Molecular characterization and functional analysis of Trx and Trp14 in roughskin sculpin (Trachidermus fasciatus)

Fish Physiology and Biochemistry - Thioredoxins (Trxs) are a family of small and highly conserved proteins which play crucial roles in the maintenance and regulation of the cellular redox...     

青贮甜菜叶喂猪试验报告

本试验对青贮甜菜叶代替7.6％的配合饲料与完全用配合饲料饲喂60～70kg杂种育肥猪进行了效果研究。经31天的饲喂试验,试验组和对照组平均日增重分别为518.22=313.5g、524.2±213.8g,料肉比分别为5.3:1、5.8:1。试验结果表明:占日粮7.6％(风干物)的青贮甜菜叶代替配合饲料的日粮与全价配合饲料的日粮饲喂60～90kg育肥猪具有相同的增重速度。每增重1kg,饲料利用率可提高8.6％,配合饲料用量降低15.2％,降低饲料成本10％,具有明显的经济效益。可大面积推广应用。     

Natural adjustment of population density of Larch casebearer (Coleophora dahurica)

Population increase of Larch casebcarer (C. dahurica) were controlled by comprehensive factors. Spring wind caused 27% of larvae on crown to fall down. Early and late frosts, larch caterpillar, sawfly and needle cast of larch could reduce the food quality and quantity of larch casebcarer and had indirect effects on population density. Birds, ants and spites were the main predators ofC. dahurica. The parasite complex comprisedPtermalidae, Eulophidae, Ichneumonidae andBraconidae. “Self-adjustment”, of population caused by “self-population density”, only runs effectively at a high larval density.     

新化合物F1050生物活性及作用方式研究

F10 50是由国家南方农药创制中心浙江基地与中科院上海有机化学研究所共同创制的含氟二苯胺类新化合物 ,室内生测结果表明 ,具有较高的杀虫、杀螨和杀菌活性 ,尤其对螨类生物活性更高 ,并对螨类各个虫态都有较好的防治效果。作用方式以触杀作用为主。     

Toxicological and biochemical characterizations of AChE in Liposcelis bostrychophila Badonnel (Psocoptera: Liposcelididae)

The toxicological and biochemical characteristics of acetylcholinesterases (AChE) in the resistant and susceptible strains (SS) of Liposcelis bostrychophila were investigated. The two resistant strains were the dichlorvos-resistant strain (DDVP-R) and the phosphine-resistant strain (PH₃-R) with resistance ratios of 22.36 and 4.51, respectively. Compared to their susceptible counterpart, the AChE activity per insect and the specific activity of AChE in DDVP-R and PH₃-R were significantly higher. There were also significant kinetic differences between DDVP-R and PH₃-R. The apparent Michaelis-Menten constant (K_m) for acetylthiocholine iodide (ATChI) was obviously lower in SS than that in PH₃-R, indicating a higher affinity to the substrate ATChI in the susceptible strains. The affinity for the substrate ATChI in DDVP-R and SS were not significantly different. The V_max value of the PH₃-R was significantly greater when compared to the V_max for the SS suggesting a possible over expression of AChE in this resistant strain. The inhibition of AChE to insecticide exposure in vitro revealed that all six insecticides were inhibitory for the extracted AChE’s. Based on the I₅₀ values, AChE of the SS were more sensitive to dichlorvos, paraoxon-ethyl, malaoxon and demeton-S-methyl than those of the two resistant strains. As for carbaryl and eserine, the PH₃-R suggested a significantly higher I₅₀s compared to the susceptible strain, while, no significant differences were found between SS and DDVP-R.     

芹菜叶斑病药剂防治试验

芹菜叶斑病（Cercospora apii Fres.）是宁夏芹菜上的主要病害之一,为了获得防治芹菜叶斑病的最佳药剂,笔者利用70 %安泰生等药剂对芹菜叶斑病的防治效果进行了试验,以期为芹菜生产提供参考.     

中国梨育种的回顾和展望

对我国梨育种工作进行了系统的回顾,包括梨的种质资源、引种、实生选种、芽变选种、辐射育种、杂交育种、遗传规律研究和生物技术研究等。我国梨的种质和品种资源丰富、栽培面积大,是世界上梨栽培面积最大、产量最多的国家。除了继续进行早熟梨的选育外,还要加强品质改良育种、加工用品种、矮化密植用品种、绿色食品用抗病等新品种的培育。探索用生物技术手段,如遗传标记和转基因技术,来改良梨的品质和抗逆性等性状。