oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 328 )

2018 ( 9452 )

2017 ( 9416 )

2016 ( 9618 )

Custom range...

Search Results: 1 - 10 of 458453 matches for " <br>张泰劼 "
All listed articles are free for downloading (OA Articles)
Page 1 /458453
Display every page Item
Chemical Control of Ipomoea cairica with Three Herbicides and Effect of 2,4-D Butylate on the Environment
三种除草剂对五爪金龙的防除作用及2,4-D丁酯对环境的影响

ZHANG Tai-jie,LUO Jian-ning,LI Wei-hu,LIANG Meng-y,TIAN Xing-shan,PENG Chang-lian,<br>,罗剑宁,李伟华,梁梦芽,田兴山,彭长连
热带亚热带植物学报 , 2012,
Abstract: Ipomoea cairica is a notorious weed which has serious harm to the environment in South China. The effects of three chemical herbicides, such as 2,4-D butylate, dicamba and fluroxypyr, on control of I. cairica in the field were studied. The results showed that 2,4-D butylate (1.00 mL L-1) could eradicate this weed. The death rate of I. cairica stems and leaves was close to 100% after spraying 2,4-D butylate (1.00 mL L-1) in 20 days. The total biomass also decreased significantly in 60 days (P<0.05), and the growth did not recovery after 90 days. The final control effect of 2,4-D butylate (1.00 mL L-1) on Ipomoea cairica was 99.8%. After spraying dicamba (1.00 mL L-1) and fluroxypyr (1.00 mL L-1) in 40 days, the death rate of I. cairica stems and leaves were 99.0% and 100%, respectively, and the regeneration rate of I. cairica was 10% and 100% after 90 days. A few roots were survival sprayed dicamba (1.00 mL L-1) after 40 days. The herbicide residue analysis showed that 2,4-D butylate could degrade quickly with half-life for 14 days, and it could not be detected in the soil after 80 days. Furthermore, 2,4-D butylate (1.00 mL L-1) was relatively safe to other plants, which could regenerate after spraying 2,4-D butylate in 1 year. Therefore, it suggested that the Ipomoea cairica growth could be good control treated with 1.00 mL L-1 2,4-D butylate.
三种除草剂对五爪金龙的防除作用及2,4-d丁酯对环境的影响
,罗剑宁?,李伟华?,梁梦芽?,田兴山?,彭长连?
热带亚热带植物学报 , 2012, DOI: 10.3969/j.issn.1005-3395.2012.04.001
Abstract: 用3种除草剂(2,4-d丁酯、麦草畏和塔隆)对五爪金龙(ipomoeacairical.sweet)进行化学防除试验。结果表明:1.00mll-1的2,4-d丁酯可以彻底杀灭五爪金龙。喷施1.00mll-12,4-d丁酯20d后,五爪金龙茎叶枯死率接近100%;60d后五爪金龙的总生物量显著低于其它处理及对照;90d后未出现生长恢复,最终盖度防效为99.8%。而喷施1.00mll-1的麦草畏40d后,五爪金龙的茎叶枯死率为99.0%,但仍有少量存活的根,90d后再次萌生率为10.0%;喷施1.00mll-1塔隆40d后,五爪金龙的茎叶枯死率为100%,90d后再次萌生率为100%。土壤残留分析表明:在有机质含量较高[(10.14±1.01)gkg-1]的土壤中2,4-d丁酯降解速率较快,半衰期为14d,施药后80d的土壤中已检测不到2,4-d丁酯。此外,在野外喷洒1.0mll-1的2,4-d丁酯对其它植物是安全的,施药1年后,样地内的植物均能恢复生长。因此,实践中可用1.00mll-1的2,4-d丁酯来防除五爪金龙。
3年观光木夏季光合生理特性初探
Photosynthetic physiological characteristics of endangered Tsoongiodendron odorum seedlings by high irradiance in summer

刘晓涛 李芸瑛 彭长连
- , 2017, DOI: 10.6054/j.jscnun.2017030
Abstract: 以盆栽三年生观光木为试材,利用便携式光合作用测量系统、叶绿素荧光仪及叶圆片氧电极等在夏季对其气体交换特性、叶绿素荧光参数及离体叶片的光合放氧等进行了测定.结果表明,观光木幼树叶片的光补偿点(LCP)为10.1 μmol m-2s-1 ,光饱和点约为(LSP)为8 00μmol m-2s-1 ,CO2补偿点(CCP)为50.72μmol mol-1,CO2饱和点(CSP)为1200μmol mol-1.夏季晴好天气下,观光木净光合速率(Pn)的日变化曲线呈双峰型,第1个峰出现在08:00,Pn为9.0μmolCO2 m-2s-1,第2个峰出现在16:00,Pn为4.6 μmolCO2 m-2s-1,12:00有明显的光合“午休”现象.在光合有效辐射较高的时段(10:00至14:00),观光木的Fv/Fm和ΦPSⅡ均处于低水平,特别是在12:00时,PSⅡ光化学效率(Fv/Fm)和PSⅡ实际光化学效率(ΦPSⅡ)降至最低值,表现PSⅡ活性明显下调,观光木叶片光合机构遭受严重的光抑制.观光木PSⅡ活性对强光的敏感性可能是其不耐高光的主要原因之一.
: The gas exchange characteristics, chlorophyll fluorescence and photosynthetic oxygen release of Tsoongiodendron odorum seedling (3-year-old, pot-cultured) were measured in summer using a portable photosynthesis system, a PAM chlorophyll fluorometer and a leaf discs oxygen electrode, respectively. The results showed that the light compensation point was 10.1μmol ·m-2·s-1, the light saturation point was 800 μmol·m-2·s-1, the light compensation point was 50.72 μmol· m-2·s-1, and the saturation point was 1200 μmol·m-2·s-1.The diurnal variations of net photosynthetic rate (Pn) presented as a bimodal shape. The first peak was 9.0 μmolm-2s-1 which appeared at 0800. The second peak was 4.6μmolm-2s-1 appearing at 16:00. There was a distinct "noon?break" phenomenon at 12:00. Both PSⅡphotochemical efficiency (Fv/Fm) and actual photochemical efficiency (ΦPSⅡ) were low during 10:00 to 14:00 when photosynthetic active radiation were high. The Fv/Fm and Φ PSⅡ decreased to the lowest at 12:00, which indicated that the activity of PSⅡ decreased and the photosynthetic?apparatus was severely inhibited by high light. The vulnerable PSⅡ might be a major reason that Tsoongiodendron odorum cannot resist highlight
A Class of Verifiable Threshold Signature Scheme
一类可验证的门限签名方案*

ZHANG Jie,WEN Qiao-yan,<br>,温巧燕
计算机应用研究 , 2005,
Abstract: A class of threshold signature scheme based on ELGamal is presented,in which the participant's secret key can be reused,the validity verification of key and subkey is also provided to prevent both dealer cheating and other participant chea-ting. Its generalization and verification can be performed independently without key management center. This scheme need not compute the inverse element.
Survey on Energy Efficiency of Clustered Routing in Wireless Sensor Network
分簇路由的无线传感器网络通信模式与能量有效性研究

Sun Yong,Jing Bo,Zhang Zong-lin,Zhang Jie,<br>孙 勇,景 博,宗麟,
电子与信息学报 , 2007,
Abstract: When nodes are organized as clusters,data packets can be transmitted from cluster members to head in either single hop or multi-hop communication mode.Using maximum energy dissipation of cluster members as evaluation criterion,energy efficiency of these two modes is researched.The conclusion was come to that the optimal communication mode depends on channel path loss.Taking the uneven energy consumption caused by solely single hop or multi-hop mode into consideration,a hybrid communication mode that nodes alternate between single hop and multi-hop mode with certain probability is proposed.The simulation result verifies that hybrid mode provides the best energy efficiency as well as even energy dissipation.
Factors Influencing Nanoindentation Test Data
影响纳米压入测试结果的因素

ZHANG Tai-hua,<br>
实验力学 , 2004,
Abstract: 纳米硬度计 ,又称深度测量压入仪。该仪器在刚性压针上施加特定载荷 ,同时记录压入试样深度。此技术广泛应用于微纳米尺度力学性能的研究。以MTSNanoIndenter○RXP为测试手段 ,参考试样熔融硅为研究对象 ,进行了不同压入深度的测试。结果显示 ,硬度和模量有随压入深度减小而增大的趋势。分析了接触零点的确定、压针尖端缺陷、试样表面的吸湿和粗糙度、弹塑性转变等因素对测试结果的影响。在压入深度为微米和亚微米量级时 ,上述因素对测试结果无显著影响 ;而在纳米量级时 ,有显著影响。所以 ,当压入深度为几十纳米时 ,纳米压入测试结果的可靠性值得注意
ASYMPTOTIC EQUILIBRIUM AND PERIODIC BOUNDARY VALUE PROBLEMS OF FIRST ORDER DIFFERENTIAL EQUATIONS
一阶微分方程的渐近平稳和周期边值问题

ZHANG SHANG-TAI,<br>
系统科学与数学 , 1988,
Abstract: 假定函数 f∈CR_+×R,R],我们考虑非线性问题u'=f(t,u),u(t_0)=u_0,t_0≥0.(A)1]附录的定理 A.1.2就(A)的渐近平稳(Asymptotic Equilibrium)给出如下的定理 A。假定 g(t,u)∈CR_+×R_+,|R_+]对于每个 t 关于 u 单调非减,且使得|f(t,u)|≤g(t,|u|),(t,u)∈R_+×R.如果问题u′=g(t,u),u(t_0)=u_0≥0的所有解 u(t)在t_0,∞)上有界,那么问题(A)渐近平稳.利用这个定理,1]在假定,f(t,u)满足单边的 Lipschitz 条件
TWO NEW SPECIES OF TRICHASTERINA FROM CHINA
毛星盾壳属两个新种

Abstract,<br>宋斌,,蔼琳
菌物学报 , 2002,
Abstract: Two species of Trichasterina on Annonaceae, T. desmotis parasitic on Desmos chinensis and T. goniothalamicola on Goniothalamus griffithii,are proposed as new. Diagnoses and illustrations of the new species are presented. All specimens examined are deposited in the Herbarium of Guangdong Institute of Microbiology (HMIGD), Guangzhou, China.
金属催化下芳基磺酸酯偶联反应的研究进展有机化学
,
有机化学 , 2006,
Abstract: 综述了金属催化下芳基磺酸酯作为底物参与形成碳—碳键、碳—氮键的偶联反应,如Suzuki-Miyaura反应、Sonogashira反应等方面的研究进展.
Histopathological Observation of Puffer Fugu obscurus Infected with Mucormycosis
暗纹东方鲀毛霉菌感染的组织病理学观察

YANG Yuan-Jie,CHEN Hui,ZHANG Chao-Hui,<br>杨鸢,陈 辉,朝晖
微生物学通报 , 2008,
Abstract: 对病症表现为溃疡性疾病的暗纹东方纯(Takifagu obscurus)进行了病原菌培养和组织病理观察.镜检溃疡和肌肉组织,可见丝状型粗大、无隔、分枝,革兰氏染色阳性的真菌菌丝.心、肝、脾和肠组织有少量炎细胞侵润,未见真菌菌丝和明显组织病理变化.经Sabouraud培养基培养观察,37℃,24 h菌丝顶端有淡黄色球形孢子囊;72 h出现气生菌丝,孢子囊成熟,释放卵圆形孢囊孢子;120 h后菌落充满平皿.肌体溃疡处皮下和肌肉组织切片镜检显示,大量菌丝体侵入皮下组织,炎细胞侵润,引起邻近肌肉组织变性坏死和间质水肿;粗大菌丝穿透粘膜入侵基底组织,同时导致小血管发生栓塞;菌丝着色显蓝色、分枝、呈直角.依据Ainsworth真菌分类系统鉴定为毛霉属(Mucor sp.)真菌.
Page 1 /458453
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.