维普中文期刊产品整合服务
376篇 您的检索式:作者名="LiJing"
    题名 作者 年代 出处 被引量
1The endoplasmic reticulum-associated degradation is necessary for plant salt tolerance显示文摘真核细胞的有机体有允许错误褶层或 unassembled 蛋白质在 endoplasmic 蜂窝胃被保留的质量控制的机制(嗯) 并且随后由嗯联系降级(ERAD ) 降级了。ERAD 小径很好在酵母和哺乳动物被学习;然而,植物 ERAD 的生物功能没被报导。通过分子、细胞的生物途径,我们发现 ERAD 是必要的让植物克服盐应力。在蛋白质在植物房间增加了的盐处理 ubiquitinated 之上,特别展开了快速在 ER 积累了并且随后导致了的蛋白质嗯压力回答。在 ERAD 小径的 HRD1/HRD3 建筑群的 HRD3A 的缺点导致了展开的蛋白质反应(UPR ) 的改变,腌的增加的植物敏感,和在植物房间的 ERAD 底层的保留。而且,我们证明从 ER 的那个 Ca 2+ 版本涉及 UPR 的举起,反应的氧种类(ROS ) 参与 ERAD 相关的植物盐反应小径。Lijing Liu Feng Cui Qingliang Li Bojiao Yin Huawei Zhang Baoying Lin Zaorong Wu Ran Xia Sanyuan Tang Qi Xie 2011Cell Research2011,21,6:19
2Structure evolution of oxygen removal from porous carbon for optimizing supercapacitor performance显示文摘The presence of oxygen functional groups is detrimental to the capacitive performance of porous carbon electrode in organic electrolyte. In this regards, hydrogen thermal reduction has been demonstrated effective approach in removing the unstable surface oxygen while maintaining the high porosity of carbon matrix. However, the exact evolution mechanism of various oxygen species during this process, as well as the correlation with electrochemical properties, is still under development. Herein, biomass-based porous carbon is adopted as the model material to trace its structure evolution of oxygen removal under hydrogen thermal reduction process with the temperature range of 400–800 °C. The optimum microstructure with low oxygen content of 0.90% and proper pore size distribution was achieved at 700°C. XPS, TPRMS and Boehm titration results indicate that the oxygen elimination undergoes three distinctive stages(intermolecular dehydration, hydrogenation and decomposition reactions). The optimum microstructure with low oxygen content of 0.90% and proper pore size distribution was achieved at 700 °C. Benefiting from the stable electrochemical interface and the optimized porous structure, the as-obtained HAC-700 exhibit significantly suppressed self-discharge and leak current, with improved cycling stability, which is attributable to the stabilization of electrochemical interface between carbon surface and electrolyte. The result provides insights for rational design of surface chemistry for high-performance carbon electrode towards advanced energy storage.Siting Yuan Xianhong Huang Hao Wang Lijing Xie Jiayao Cheng Qingqiang Kong Guohua Sun Cheng-Meng Chen 2020Journal of Energy Chemistry2020,29,12:16
3Simultaneous adsorption of lead and cadmium on MnO_2-loaded resin显示文摘MnO2-loaded D301 weak basic anion exchange resin has been used as adsorbent to simultaneously remove lead and cadmium ions from aqueous solution.The effects of adsorbent dosage,solution pH and the coexistent ions on the adsorption were investigated.Experimental results showed that with the adsorbent dosage more than 0.6 g/L,both Pb 2+ and Cd2+ were simultaneously removed at pH range 5-6.Except for HPO 42+ ,the high concentration coexistent ions such as Na + ,K + ,Cl+ ,NO3-,SO42+ and HCO3-,showed no significant effect on the removal efficiency of both Pb2+ and Cd2+ under the experimental conditions.The coexistence of Mg2+ ,Ca2+ caused the reduction of Cd2+ removal,but not for Pb2+ .The adsorption equilibrium for Pb2+ and Cd 2+ could be excellently described by the Langmuir isotherm model with R2 > 0.99.The maximum adsorption capacity was calculated as 80.64 mg/g for Pb2+ and 21.45 mg/g for Cd2+ .The adsorption processes followed the pseudo first-order kinetics model.MnO2-loaded D301 resin has been shown to have a potential to be used as an effective adsorbent for simultaneous removal of lead and cadmium ions from aqueous solution.Lijing Dong,Zhiliang Zhu,Hongmei Ma,Yanling Qiu,Jianfu ZhaoState Key Laboratory of Pollution Control and Resource Reuse,Tongji University,Shanghai 200092,China 2010Journal of Environmental Sciences2010,22,2:16
4Utilizing Landsat TM Imagery to Map Greenhouses in Qingzhou, Shandong Province, China显示文摘To build a rapid and accurate method for greenhouse vegetable land information extraction using an index model derived from TM digital data of Qingzhou City, Shandong Province, based on a systematic analysis of the spectral characteristics of different land use types in the study area, a subset of the image was first made to eliminate the mountainous region not associated with vegetable distribution, and then water body pixels were masked. With this the V1 index model for greenhouse vegetable land extraction was developed. The index model indicated greenhouse vegetable land for Qingzhou in April 2002 was concentrated in the southeast and around rural residential areas. Field data used for an accuracy evaluation showed that greenhouse hectares determined with remote sensing were 95.9% accurate, and accuracy for the spatial distribution of greenhouse vegetable land cross checked with a random sample was 96.3%. Therefore, this approach provided an effective method for greenhouse vegetable land information extraction and has potential significance for management of greenhouse vegetable production in the study area, as well as North China.ZHAOGeng-Xing LIJing LITao YUEYu-De T.WARNER 2004Pedosphere2004,14,3:15
5Current Control Strategy of Chain Circuit STATCOM显示文摘在链式静止同步补偿器(static synchronous compen-sator,STATCOM)小信号交流模型的基础上,提出简化的STATCOM电流控制闭环系统;分别对典型Ⅰ型、典型Ⅱ型控制系统的电流调节器进行参数优化及比较,分析表明,对于电流阶跃响应,系统处于线性控制状态时超调量相对百分比不变,处于限幅非线性状态时超调量绝对值不变;采用比例调节器的典型I型系统稳态精度稍差,但动态控制精度较高,适合用于链式STATCOM工程装置;在a-b-c坐标系下仿真表明,应用优化设计的典型Ⅰ型系统控制参数,链式STATCOM输出电流可以快速跟踪参考值变化,具有良好的稳定性和跟踪精度。WANG Xuan FU Jian TENG Letian SUN Lijing ZHAO Ruibin WU Shouyuan DENG Zhanfeng 2012中国电机工程学报2012,32,12:15
6Ammonia pollution characteristics of centralized drinking water sources in China显示文摘The characteristics of ammonia in drinking water sources in China were evaluated during 2005-2009.The spatial distribution and seasonal changes of ammonia in different types of drinking water sources of 22 provinces,5 autonomous regions and 4 municipalities were investigated.The levels of ammonia in drinking water sources follow the order of river > lake/reservoir > groundwater.The levels of ammonia concentration in river sources gradually decreased from 2005 to 2008,while no obvious change was observed in the lakes/reservoirs and groundwater drinking water sources.The proportion of the type of drinking water sources is different in different regions.In river drinking water sources,the ammonia level was varied in different regions and changed seasonally.The highest value and wide range of annual ammonia was found in South East region,while the lowest value was found in Southwest region.In lake/reservoir drinking water sources,the ammonia levels were not varied obviously in different regions.In underground drinking water sources,the ammonia levels were varied obviously in different regions due to the geological permeability and the natural features of regions.In the drinking water sources with higher ammonia levels,there are enterprises and wastewater drainages in the protected areas of the drinking water sources.Qing Fu Binghui Zheng Xingru Zhao Lijing Wang Changming Liu 2012Journal of Environmental Sciences2012,24,10:15
7Spatial variations of macrozoobenthos and sediment nutrients in Lake Yangcheng: Emphasis on effect of pen culture of Chinese mitten crab显示文摘We determined the effect of Chinese mitten crab(CMC) pen culture on the quantified spatial distribution of the macrozoobenthic community and sediment nutrients in Lake Yangcheng.Redundancy analysis indicated that water temperature, macrophyte occurrence, sediment type, and crab culture were the main environmental factors that influence the spatiotemporal macrozoobenthic distribution. Macrozoobenthic assemblages in the lake were characterized by eutrophic indicator species. In the most polluted estuaries, the abundance and diversity indices of the whole community and abundance of chironomids and oligochaetes were significantly depressed, and sediment carbon(C) and phosphorus(P) were significantly enhanced compared with those in the western, middle(MB), and eastern basin(EB). Crab culture in this lake had significant effects on the species composition of the macrozoobenthic community in one of three CMC culture pens(CP), and generally depressed the abundance of most chironomid and oligochaete species. Significantly increased diversity, evenness, sediment carbon and nitrogen content, and sediment C:P ratio in the CP were found compared with those in the three basins.However, no conspicuous difference in sediment P content between the CP and the two basins of MB and EB was detected. Our results showed that the enhanced diversity and evenness of macrozoobenthos might be associated with the joint effect of macrophyte planting and crab predation, and macrophyte planting may modify the effects of CMC culture by leading to disproportional accumulation of C and N in the sediment relative to P in the CP of the lake.Liping Chen Ying Zhang Qigen Liu Zhongjun Hu Yuejuan Sun Ziran Peng Lijing Chen 2015Journal of Environmental Sciences2015,27,11:15
8Heyan Kuntai capsule versus dehydroepiandrosterone in treating Chinese patients with infertility caused by diminished ovarian reserve: a multicenter, randomized controlled trial显示文摘OBJECTIVE: To evaluate the clinical efficacy and safety of Heyan Kuntai capsule(HYKT) in treating women with infertility caused by diminished ovarian reserve(DOR).METHODS: One hundred eight eligible patientsfrom three Chinese hospitals were randomly divided into an HYKT treatment group(n = 55) or a dehydroepiandrosterone(DHEA) treatment group(n =53). Patients in the HYKT group were treated orally with four 0.5 g HYKT three times a day; patients in the DHEA group were treated with one 25.0 mg DHEA capsule three times a day. All patients were treated for 3 months and followed up over a3-month period.RESULTS: Of 108 patients, 12 dropped out: six from the HYKT group, and six from the DHEA group. Eleven patients got pregnant during the treatment. Serum anti-Müllerian hormone levels and antral follicle counts increased significantly in both groups after treatment(P < 0.05) especially in the HYKT group(P < 0.05). Serum follicle stimulating hormone(FSH) levels and FSH/luteinizing hormone ratios decreased(P < 0.05) with no significant difference between the two groups. Estradiol levels in the HYKT group and DHEA-sulfate levels in the DHEA group both increased(P < 0.05). The spontaneous pregnancy rates were 12% and 11% in the HYKT and DHEA groups, respectively(not significant). During the follow-up period, 16 patients in the HYKT group underwent in vitro fertilization-embryo transfer(IVF-ET) and the number of retrieved oocytes was(5.1 ± 1.8). In DHEA group, 20 patients underwent IVF-ET and the number of retrieved oocyte was(4.2 ± 1.9)(not significant); clinical pregnancy rates were 38% in the HYKT group and 20%in DHEA group(not significant). No significant adverse reactions were observed.CONCLUSION: HYKT can improve the ovarian re-serve and hormone levels in patients with infertility caused by DOR. Pregnancy rates after HYKT treatment were similar to those of DHEA treatment.HYKT might be an alternative to the treatment of infertility caused by DOR.Gao Hui Xia Tian Ma Ruihong Zhao Zhimei Song Xueru Wang Baojuan Liu Lijing Han Kaimei Wang Guoqing Fu Yu Hao Guimin 2017Journal of Traditional Chinese Medicine2017,37,4:14
9Microcrack analysis of Sanya grantite fragments from rockburst tests显示文摘Fractures running along a plane reflect the cracking progress.In this paper uniaxial and rockburst tests on a group of granite specimens from Sanya province are described.Scanning electron microscopic imaging was used to characterize the fragments.Fractal fracture mechanics were used to analyze the microcracks in terms of both the crack type and the mineral constituent.A statistical analysis showed that the area of inter-granular cracking exceeds that of intra-granular cracking.Several types of crack were observed in the cracked areas.The percentage of intra-granular cracks in fragments from rockburst tests exceeds that from uniaxial compression tests.The results also showed that feldspar deformation was the main cause of fracture and that the consolidation along quartz grain boundaries was another weak area in the granite.Cracking along quartz grains had enough energy to enter the quartz crystal in the rockburst samples.All these results contribute to further research on rockburst mechanics.HE, Manchao NIE, Wen HAN, Liqiang LING, Lijing 2010Mining Science and Technology2010,20,2:11
10中年体重指数与老年住院、死亡的关系显示文摘背景:大量证据显示,超重和肥胖有损健康。它们与高血压、高血脂等已知冠心病危险因素密切相关。但是,除此之外。它们是否对心血管疾病还有其他影响?人们对此争论不休。 目的:在人群中(无论其在基线时是否存在其他主要危险因素)评价中年时期体重指数与老年后发病率、死亡率之间的关系。 设计:“芝加哥心脏学会工业检查项目研究”(Chicago Heart Association Detection Projectin Industry)是一项前瞻性研究,研究将基线时(1967—1973年)心血管患病风险分为低危(血压≤120/≤80mm Hg,血清总胆固醇水平〈200mg/dL[5.2mmol/L],不吸烟)、中危(不吸烟,收缩压121—139mm Hg。舒张压81—89mm Hg,和/或血清总胆固醇水平200—239mg/dL[5.2—6.2mmol/L])以及存在下列危险因素中的1项、2项或全部3项:血压≥140/90mm Hg,血清总胆固醇水平≥240mg/dL(6.2 mmol/L),吸烟。体重指数分为正常(18.5—24.9)、超重(25.0—29.9)和肥胖(≥30)。平均随访时间为32年。 地点及参试者:共有17643人参加研究,其中既有男性也有女性,年龄为31—64岁。他们均来自芝加哥地区的公司或机构。基线时无冠心病(coronary heart disease,CHD)和糖尿病,心电图也未见重大异常。 主要观测指标:65岁以后因CHD、心血管疾病或糖尿病住院、死亡的情况。 结果:在多变量分析中,对收缩压和血清总胆固醇水平进行校正。研究发现,在低危组和中危组中,与体重正常者相比,超重者死于CHD的比值比(95%可信区间)分别为1.43(0.33—6.25)和2.07(1.29—3.31),而因CHD住院的比值比(95%可信区间)分别为4.25(1.57—11.5)和2.04(1.29—3.24)。其他风险组结果类似,心血管疾病的情况也大致如此,但糖尿病的情形则更为严重(低危组:死于糖尿病的比值比[95%可信区间]为11.0[2.21—54.5],因糖尿病住院的比值比[95%可信区间]为7.84[3.95—15.6])。 结论:对没有心血管危险因素的人群和有1个或1个以上危险因素的人群而言,中年时肥胖者老年后因CHD、心血管疾病或糖尿病住院、死亡的风险高于中年时体重正常者。Lijing L. Yan Martha L Daviglus Kiang Liu 顾佳(译) 2006美国医学会杂志(中文版)2006,25,4:11
11Lopingian mixed floras from Linxi Formation in Soron area,Inner Mongolia显示文摘A lot of well-preserved plants from the Linxi Formation are collected in the Soron area,Inner Mongolia,consisting of 34 species of 16 genera. They are Late Permian in age. The flora is characterized by a lot of Angaran plants,such as Paracalamites,Comia,Rhachiphyllum,Iniopteris,Rufloria,etc. Some Cathaysian elements,such as Lobatannularia lingulata,L. multifolia,Fascipteris Cathaysiantus,F. densata,Taeniopteris szei,Cladophlebis liulinensis and C. permica,are also mixed within the present flora. This indicates that the Soron of Inner Mongolia was located in the sector between the Angaran and Cathysian floristic provinces in Lopingian. It is beneficial for depicting the location and the evolution of the Solenker--Xar Moron suture zone in the phytogeographic view. The transmigration of tropical and subtropical Cathaysian plants to the north indicates that the Paleoasian Ocean was closed during the late Permian along the suture zone.ZHANG Dejun SUN Yuewu DING Haisheng YANG Zhenyuan TANG Lijing 2014Global Geology2014,17,2:10
12High temperature tensile properties of directionally solidified Ni-43Ti-4Al-2Nb-2Hf alloy显示文摘By liquid metal cooling(LMC) process,the Ni-43Ti-4Al-2Nb-2Hf(%,atomic fraction) alloy was directionally solidified(DS).The microstructure and tensile properties at room and elevated temperature were investigated.It was found that the DS process significantly improves the room temperature tensile strength,increasing by 70% compared with the as-cast alloy.After appropriate heat treatment(HT),the average tensile strength reaches above 1900 MPa,nearly twice of the as-cast one.At 800 and 900 ℃,the tensile strengths are about 308 and 169 MPa,respectively.Jiang, Dongwen Zheng, Lijing Zhou, Lei Pan, Liwen Tang, Xiaoxia Zhang, Hu 2012Rare Metals2012,31,4:9
13Berberine inhibits androgen synthesis by interaction with aldo-keto reductase 1C3 in 22Rv1 prostate cancer cells显示文摘Aldo-keto reductase 家庭 1 成员 C3 最近在阉割抵抗的前列腺癌症被认为是一个潜在的治疗学的目标。此处,我们调查了 berberine 是否由通过 Aldo-keto reductase 家庭 1 成员 C3 的抑制减少雄激素合成推迟了阉割抵抗的前列腺癌症的前进。房间生存能力和细胞的睾丸激素内容在前列腺癌症房间被测量。Aldo-keto reductase 家庭 1 成员 C3 mRNA 和蛋白质水平被 RT-PCR 和西方的门栓分析分别地检测。有 AutoDock 工具的计算机分析与 Aldo-keto reductase 家庭 1 成员 C3 探索了 berberine 的分子的相互作用。我们发现 berberine 禁止了 22Rv1 房间增长并且减少以一种剂量依赖者方式的细胞的睾丸激素形成。Berberine 禁止了 Aldo-keto reductase 家庭 1 成员 C3 酶活动,而非影响了 mRNA 和蛋白质表情。分子的停靠学习证明 berberine 能进入 Aldo-keto reductase 家庭 1 成员 C3 和形式 π 的活跃中心; -π和氨基酸的残余 Phe306 和 Phe311 的相互作用。在结论,有 Aldo-keto reductase 家庭 1 成员 C3 的 berberine 的结构的相互作用被减少归因于 Aldo-keto reductase 家庭 1 成员 C3 酶活动的抑制和 22Rv1 前列腺癌症细胞生长的抑制细胞内部的雄激素合成。我们的结果作为铅混合物用 berberine 为 AKR1C3 禁止者的设计,研究,和发展提供试验性的基础。Yuantong Tian , Lijing Zhao Ye Wang Haitao Zhang Duo Xu Xuejian Zhao Yi Li Jing Li 2016Asian Journal of Andrology2016,18,4:9
14Selective laser melting of Al–8.5Fe–1.3V–1.7Si alloy: Investigation on the resultant microstructure and hardness显示文摘This article presents the microstructure and hardness variation of an Al–8.5Fe–1.3V–1.7Si(wt%, FVS0812) alloy after selective laser melting(SLM) modification. Three zones were distinguished across the melting pool of the SLM-processed FVS0812 alloy: the laser melted zone(LMZ), the melting pool border, and the heat affected zone(HAZ) in the previously deposited area around the melting pool. Inside the LMZ, either an extremely fine cellular-dendritic structure or a mixture zone of the a-Al matrix and nanoscale Al_(12)(Fe,V)_3Si particles appeared. With a decreased laser beam scanning speed, the cellular-dendritic structure zone within the LMZ shrank significantly while the mixture zone expanded. The a-Al and Al_(12)(Fe,V)_3Si mixture zone was also observed in the HAZ, but another phase, submicron h-Al_(13)Fe_4 particles with rectangular or hexagonal shapes,formed along the melting pool border. Microhardness tests indicated that the hardness of the SLM-processed FVS0812 samples far exceeded that of the as-cast FVS0812 alloy.Zheng Lijing Liu Yingying Sun Shaobo Zhang Hu 2015Chinese Journal of Aeronautics2015,28,2:9
15Effects of electroacupuncture at Guanyuan(CV 4)or Sanyinjiao(SP 6)on hypothalamus-pituitary-ovary axis and spatial learning and memory in female SAMP8 mice显示文摘OBJECTIVE: To investigate the effects of electroacupuncture(EA) at the Guanyuan(CV 4) or Sanyinjiao(SP 6) acupoints on the hypothalamus-pituitary-ovary(HPO) axis and spatial learning and memory in female mice.METHODS: Nine-month-old female mice with senescence-accelerated mouse prone 8(SAMP8)were divided into three groups: the disease model,EA-Guanyuan and EA-Sanyinjiao groups. Concurrently, 9-month old female mice with senescence-accelerated mouse resistance 1(SAMR1)were set as the control model group. The two treatment groups were given the same pattern of EA stimulation. Gonadotropin-releasing hormone, luteinizing hormone, follicle-stimulating hormone(FSH) and Serum estradiol levels in the Hypothalamus-pituitary-ovary axis were assessed by enzyme-linked immunosorbent assay to determinethe HPO axis function level. Spatial learning and memory were assessed by the Morris Water Maze(MWM) test.RESULTS:(a) HPO axis: compared with the control model group, the disease model group displayed a decrease in E2 levels(P < 0.01), and an increase in Gn RH, LH and FSH levels(P < 0.01). E2 levels were increased in EA treatment groups compared with the disease model group(P < 0.05). In contrast,Gn RH and LH and FSH levels were reduced(P <0.05). EA-Sanyinjiao group was superior than EA-Guanyuan group on increasing E2 and declining Gn RH levels(P < 0.01).(b) The MWM test demonstrated that the response latency in the EA-Sanyinjiao treatment group declined from day 2 to day5 compared with the disease model group(P <0.05), whereas the EA-Guanyuan treatment group showed no significant difference.CONCLUSION: EA can regulate hormone(E2, FSH,LH, Gn RH) levels in the HPO axis and the spatial learning and memory ability in female SAMP8 mice. Moreover, this effect may have been more pronounced in the EA-Sanyinjiao group than the EA-Guanyuan group. The underlying mechanism of the EA-induced changes may be related to gonadal hormone shifts in the HPO axis, followed by an improvement in spatial learning and memory.Wang Jing Cheng Kai Qin Zhuo Wang Yanping Zhai Lijing You Min Wu Juanjiao 2017Journal of Traditional Chinese Medicine2017,37,1:8
16Effective genome editing and identification of a regiospecific gallic acid 4-O-glycosyltransferase in pomegranate(Punica granatum L.)显示文摘Pomegranate(Punica granatum L.)trees are woody perennials that bear colorful and nutritious fruits rich in phenolic metabolites,e.g.,hydrolyzable tannins(HTs)and flavonoids.We here report genome editing and gene discovery in pomegranate hairy roots using Clustered Regularly Interspaced Short Palindromic Repeats(CRISPR)/CRISPR-associated protein 9(Cas9)(CRISPR/Cas9),coupled with transcriptome and biochemical analyses.Single guide RNAs(sgRNAs)were designed to target two UDP-dependent glycosyltransferases(UGTs),PgUGT84A23 and PgUGT84A24,which possess overlapping activities inβ-glucogallin(a galloylglucose ester;biosynthetic precursor of HTs)biosynthesis.A unique accumulation of gallic acid 3-O-and 4-O-glucosides(galloylglucose ethers)was observed in the PgUGT84A23 and PgUGT84A24 dual CRISPR/Cas9-edited lines(i.e.,ugt84a23 ugt84a24)but not the control(empty vector)or PgUGT84A23/PgUGT84A24 single edited lines(ugt84a23 or ugt84a24).Transcriptome and real-time qPCR analyses identified 11 UGTs with increased expression in the ugt84a23 ugt84a24 hairy roots compared to the controls.Of the 11 candidate UGTs,only PgUGT72BD1 used gallic acid as substrate and produced a regiospecific product gallic acid 4-O-glucoside.This work demonstrates that the CRISPR/Cas9 method can facilitate functional genomics studies in pomegranate and shows promise for capitalizing on the metabolic potential of pomegranate for germplasm improvement.Lijing Chang Sheng Wu Li Tian 2019Horticulture Research2019,6,1:8
17A field experimental study of lignin sand stabilizing material(LSSM) extracted from spent-liquor of straw pulping paper mills显示文摘A new technique was introduced for sand stabilization and re-vegetation by use of lignin sand stabilizing material(LSSM). LSSM is a reconstructed organic compound with lignin as the most dominant component from the extracts of black-liquor issued by straw pulp paper mills. Unlike the polyvinyl acetate or foamed asphalt commonly used for dune stabilization, the new material is plant-friendly and can be used with virescence actions simultaneously. The field experimental study was conducted since 2001 in China’s Northwest Ningxia Hui Autonomous Region and has been proved that LSSM is effective in stabilizing the fugitive dunes, making the arenaceous plants survive and the bare dune vegetative. The advisable solution concentration is 2% and the optimal field spraying quantity is 2 5 L/m^2 The soil nutrients of the stabilized and greened dune, such as organic matter, available phosphorous and total nitrogen are all increased compared with the control treatment, which is certainly helpful to the growth of arenaceous plants. The technique is worthwhile to be popularized because it is provided not only a new method for desertification control but also an outlet for cleaning contaminants issued from the straw paper mills.WANGHan-jie LIJing LUXiao-zhen JINYong-can 2005Journal of Environmental Sciences2005,17,4:8
18The vernalization-induced long non-coding RNA VAS functions with the transcription factor TaRF2b to promote TaVRN1 expression for flowering in hexaploid wheat显示文摘Vernalization is a physiological process in which prolonged cold exposure establishes flowering competence in winter plants. In hexaploid wheat, TaVRN1 is a cold-induced key regulator that accelerates floral transition. However, the molecular mechanism underlying the gradual activation of TaVRN1 during the vernalization process remains unknown. In this study, we identified the novel transcript VAS (TaVRN1 alternative splicing) as a non-coding RNA derived from the sense strand of the TaVRN1 gene only in winter wheat, which regulates TaVRN1 transcription for flowering. VAS was induced during the early period of vernalization, and its overexpression promoted TaVRN1 expression to accelerate flowering in winter wheat. VAS physically associates with TaRF2b and facilitates docking of the TaRF2b-TaRF2a complex at the TaVRN1 promoter during the middle period of vernalization. TaRF2b recognizes the Sp1 motif within the TaVRN1 proximal promoter region, which is gradually exposed along with the disruption of a loop structure at the TaVRN1 locus during vernalization, to activate the transcription of TaVRN1. The tarf2b mutants exhibited delayed flowering, whereas transgenic wheat lines overexpressing TaRF2b showed earlier flowering. Taken together, our data reveal a distinct regulatory mechanism by which a long non-coding RNA facilitates the transcription factor targeting to regulate wheat flowering, providing novel insights into the vernalization process and a potential target for wheat genetic improvement.Shujuan Xu Qi Dong Min Deng Dexing Lin Jun Xiao Peilei Cheng Lijing Xing Yuda Niu Caixia Gao Wenhao Zhang Yunyuan Xu Kang Chong 2021Molecular Plant2021,14,9:7
19Regenerative Braking Strategy for Motor Hoist by Ultracapacitor显示文摘Rising concern in environmental issues on global scale has made energy saving in powered equipment a very important subject.In order to improve the energy efficiency and driving range of a motor hoist,a regenerative braking system is designed and discussed.The system takes a unique ultracapacitor-only approach to energy storage system.The bi-directional bride DC?DC converter which regulates current flow to and from the ultracapacitor operates in two modes:boost and buck,depending on the direction of the flow.In order to provide constant input and output current at the ultracapacitor,this system uses a double proportional-integral(PI) control strategy in regulating the duty cycle of PWM to the DC?DC converter.The permanent magnet synchronous motor(PWSM) drive system is also studied.The space vector pulse width modulation(SVPWM) technique,along with a two-closed-loop vector control model,is adopted after detailed analysis of PMSM characteristics.The overall model and control strategy for this regenerative braking system is ultimately built and simulated under the MATLAB and Simulink environment.A test platform is built to obtain experimental results.Analysis of the results reveals that more than half of the gravitational potential energy can be recovered by this system.Simulation and experimentation results testify the validity of the double PI control strategy for interface circuit of ultracapacitor and SVPWM strategy for PMSM.BIAN Yongming ZHU Lijing LAN Hao LI Anhu XU Xinming 2012Chinese Journal of Mechanical Engineering2012,25,2:7
20Experimental study on performance of pneumatic seeding system显示文摘The purpose of this study was to promote the development of large-scale agricultural machines in China and meet the demand of air seeder localization.This study investigated the relationship between the working parameters and the performance of pneumatic seeding system,Cangmai 6004 wheat seed was used.A test platform for pneumatic seeding systems was developed,and then a series of experiments were performed based on the quadratic general rotary unitized design and response surface methodology(RSM).The seeding rate and the air flow rate were selected as affecting factors,coefficient of variation(CV)of evenness of feeding rate between rows and CV of seeding stability of total rows were assigned as the test indexes.Regression models between factors and indexes were established,and finally,an optimal equation based on this pneumatic seeding system were established as well,which can determine the proper air flow rate once the seeding rate was set based on the practical agronomic requirements.For example,when the seeding rate is set as 250 kg/hm^(2),the proper air flow rate of 7.53 m3/min can be obtained.The verification experiment results showed that the predicted working parameters obtained by RSM were feasible,which might provide a theoretical basis for further research of pneumatic seed metering systems.Liu Lijing Yang Hui Ma Shaochun 2016International Journal of Agricultural and Biological Engineering2016,9,6:7
返回顶部 每页显示:
共19页 首页 上一页 第1页 下一页 末页 /19 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费