检索结果-南通市图书馆

Nitrous Oxide and Methane Fluxes During the Maize Season Under Optimized Management in Intensive Farming Systems of the North China Plain

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2014年第4期24卷 487-497页

作者： SHI Yue-Feng WU Wen-Liang MENG Fan-Qiao ZHENG Liang WANG Da-Peng YE hui DING Guang-Wei College of Resources and Environmental Sciences China Agricultural University Yellow River Basin Water Resources Protection Bureau Rubber Research Institute Chinese Academy of Tropical Agriculture Science Department of Chemistry Northern State University

Addressing concerns about mitigating greenhouse gas （GHG） emissions while maintaining high grain yield requires improved management practices that achieve sustainable intensification of cereal production systems. In the North China Plain, a field experiment was conducted to measure nitrous oxide （N2O） and methane （CH4） fluxes during the maize （Zea mays L.） season under various agricultural management regimes including conventional treatment （CONT） with high N fertilizer application at a rate of 300 kg N ha-1 and overuse of groundwater by flood irrigation, optimal fertilization 1 treatment （OPTIT）, optimal fertilization 2 treatment （OPT2T）, and controlled-release urea treatment （CRUT） with reduced N fertilizer application and irrigation, and a control （ck） with no N fertilizer. In contrast to CONT, balanced N fertilization treatments （OPT1T, OPT2T, and CRUT） and ck demonstrated a significant drop in cumulative N20 emission （1.70 v.s. 0.43-1.07 kg N ha-l）, indicating that balanced N fertilization substantially reduced N20 emission. The vMues of the N20 emission factor were 0.42%, 0.29%, 0.32%, and 0.27% for CONT, OPTIT, OPT2T, and CRUT, respectively. Global warming potentials, which were predominantly determined by N20 emission, were estimated to be 188 kg CO2-eq ha-1 for ck and 419-765 kg CO2-eq ha-1 for the N fertilization treatments. Global warming potential intensity calculated by considering maize yield was significantly lower for OPT1T, OPT2T, CRUT, and ck than for CONT. Therefore, OPTIT, OPT2T, and CRUT were recommended as promising management practices for sustaining maize yield and reducing GHG emissions in the North China Plain.

关键词： balanced N fertilization CH4 global warming potential greenhouse gases maize yield N20

Silencing of LRP1 exacerbates inflammatory response via TLR4-mediated NF-κB and MAPKs signaling pathways in APP/PS1 transgenic mice

在线全文

学校读者我要写书评

暂无评论

Silencing of LRP1 exacerbates inflammatory response via TLR4...

Neuroprotective effects of a ketogenic diet in combination with exogenous ketone salts following acute spinal cord injury

中国解剖学会2021年年会

作者： He Yingying Ruganzu john Bosco Peng Xiaoqian Zheng Quzhao Ding Bo Jin hui Yang Weina Department of Human Anatomy Histology and EmbryologyXi’an Jiaotong University Health Science Center

Activation of glial cells(including microglia and astrocytes) appears central to the initiation and progression of neuroinflammation in Alzheimer’s disease (AD).The low-density lipoprotein receptor-related protein 1 ...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Neural Regeneration Research 2020年第10期15卷 1912-1919页

作者： Bo-Tao Tan hui Jiang Aaron JMoulson Xiao-Liang Wu Wen-Chun Wang Jie Liu Ward TPlunet Wolfram Tetzlaff Department of Rehabilitation Medicine The Second Affiliated Hospital of Chongqing Medical UniversityChongqingChina International Collaboration on Repair Discoveries(ICORD) Blusson Spinal Cord CenterVancouverBritish ColumbiaCanada Department of Zoology University of British ColumbiaVancouverBritish ColumbiaCanada Department of Spinal Surgery Nanfang HospitalSouthern Medical UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Medicine The General Hospital of Western Theater Command PLAChengduSichuan ProvinceChina

We have previously shown that induction of ketosis by ketogenic diet(KD)conveyed neuroprotection following spinal cord injury in rodent models,however,clinical translation may be limited by the slow raise of ketone levels when applying KD in the acute post-injury *** we investigated the use of exogenous ketone supplementation(ketone sodium,KS)combined with ketogenic diet as a means rapidly inducing a metabolic state of ketosis following spinal cord injury in adult *** uninjured rats,ketone levels increased more rapidly than those in rats with KD alone and peaked at higher levels than we previously demonstrated for the KD in models of spinal cord ***,ketone levels in KD+KS treated rats with SCI did not exceed the previously observed levels in rats treated with KD *** still demonstrated neuroprotective effects of KD+KS treatment that extend our previous neuroprotective observations with KD *** results showed increased neuronal and axonal sparing in the dorsal corticospinal ***,better performance of forelimb motor abilities were observed on the Montoya staircase(for testing food pellets reaching)at 4 and 6 weeks post-injury and rearing in a cylinder(for testing forelimb usage)at 6 and 8 weeks *** together,the findings of this study add to the growing body of work demonstrating the potential benefits of inducing ketosis following *** salt combined with a ketogenic diet gavage in rats with acute spinal cord injury can rapidly increase ketone body levels in the blood and promote motor function *** study was approved by the Animal Care Committee of the University of British Columbia(protocol No.A14-350)on August 31,2015.

关键词： axon behavior corticospinal tract ketogenic diet ketone supplementation myelin neuroprotection spinal cord injury

Growth of tandem long-mat rice seedlings using controlled release fertilizers:Mechanical transplantation can be more economical and high yielding

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2023年第12期22卷 3652-3666页

作者： HE Wen-jun HE Bin WU Bo-yang WANG Yu-hui YAN Fei-yu DING Yan-feng LI Gang-hua Sanya Institute of Nanjing Agricultural University/Jiangsu Collaborative Innovation Center for Modern Crop Production/Key Laboratory of Crop Physiology Ecology and Production Management Nanjing Agricultural UniversityNanjing 210095P.R.China National Engineering and Technology Center for Information Agriculture Nanjing 210095P.R.China China-Kenya Belt and Road Joint Laboratory on Crop Molecular Biology Nanjing 210095P.R.China School of Life Sciences and Food Engineering Huaiyin Institute of TechnologyHuai’an 223003P.R.China

The traditional soil-based rice seedling production methods for mechanical transplanting are resource-intensive,time consuming and *** improvement and optimization of nutrient management in soil-less nursery raising methods like tandem long-mat seedlings(TLMS)are necessary for the resource-efficient cultivation of *** the present study,a controlled-release fertilizer(CRF)-polymer-coated compound fertilizer with 3 months release period(PCCF-3M)was applied as seedling fertilizer(SF),and five different dosages of SF(SF-0,SF-10,SF-20,SF-30,and SF-40)were compared with an organic substrate as the control(ck).Among all SF treatments,the best results were obtained with the application of 20 g/tray of SF(SF-20),as the seedling quality and machine transplanting quality were comparable to those of *** contrast,the lower dosages(SF-0 and SF-10)resulted in low nitrogen content and reduced shoot growth,while the higher dosages(SF-30 and SF-40)resulted in toxicity(increased malondialdehyde accumulation)and inhibited the root ***,SF-20 increased panicle number(5.6-7.0%)and yield(4.3-5.3%)compared with ck,which might be related to the remaining SF entangled in the roots supporting the tiller growth of rice seedlings in the ***,SF-20 reduced the seedling block weight(53.1%)and cost of seedling production(23.5%)but increased the gross margin,indicating that it was easy to handle and *** together,our results indicate that SF-20 is a cost-effective way to promote the growth and transplanting efficiency of rice *** our knowledge,this study is the first to determine the optimum dosage of CRF for the soil-less production of rice seedlings.

关键词： machine-transplanted rice tandem long-mat seedlings controlled release fertilizer seedling quality yield

饱和黏土不排水抗剪强度各向异性的热力学本构模型研究

在线全文

学校读者我要写书评

暂无评论

岩土工程学报 2014年第5期36卷 836-846页

作者：陈志辉程晓辉清华大学土木工程系北京100084

基于饱和土体TTM(Tsinghua thermodynamic soil model)热力学本构模型分析研究了饱和黏土的不排水抗剪强度各向异性问题。模型及试验研究表明:非等向或0K固结历史是引起土体强度各向异性的重要原因,固结应力比ck越小,不排水强度各向异... 详细信息

基于饱和土体TTM(Tsinghua thermodynamic soil model)热力学本构模型分析研究了饱和黏土的不排水抗剪强度各向异性问题。模型及试验研究表明:非等向或0K固结历史是引起土体强度各向异性的重要原因,固结应力比ck越小,不排水强度各向异性越大。不排水加载过程中主应力轴的方向对土体不排水抗剪强度和变形有着重要影响。一般而言,当主应力轴方向从0°旋转到90°时,土体的不排水抗剪强度逐渐下降,峰值应变却逐渐增大。此外,非等向固结会导致土体主应力与主应变的非共轴性。利用TTM理论模型,对Kaolin Clay和Boston Blue Clay的不同试验结果进行了模拟验证和预测。结果表明,TTM理论模型具有反映和预测应力引起的饱和黏土强度各向异性和应变软化等特性的能力,同时也具备精准描述主应力轴旋转等复杂路径下饱和黏土的强度和变形特征的能力。

关键词：热力学本构模型弹性弛豫颗粒熵运动线性非平衡态热力学理论 Onsager关系强度各向异性

Active ESD Shunt with Transistor Feedback to Reduce Latchup Susceptibility or False Triggering

在线全文

学校读者我要写书评

暂无评论

Active ESD Shunt with Transistor Feedback to Reduce Latchup ...

Establishment and characterization of a new human ampullary carcinoma cell line,DPC-X1

2004 7th International Conference on Solid-State and Integrated Circuits Technology（ICSICT 2004）

作者： Paul C.F.Tong Ming Dou Ker john hui Patty Z.Q.Liu Pericom Semiconductor Corporation 3545 North First Street San JoseCalifornia 95134USA National Chiao-Tung University HsinchuTaiwanChina

＜正＞We present an anomalous latchup failure phenomenon related to the large Nwell resistor associated with the generic RC-triggered,MOSFET-based Active Clamp circuit for on-chip ESD protection between VCC and VSS buses.A novel Active Clamp circuit with PMOS feedback technique has been proposed to reduce the IC’s susceptibility to Latchup during negative current injection at neighboring I/O pads or false triggering of the RC trigger circuit due to noise on the VCC power *** effectiveness of this new Active Clamp circuit is confirmed by our experiment and simulation *** of the size of the PMOS feedback transistor is also discussed in this paper.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第17期29卷 2642-2656页

作者： Hao Xu Chang-Peng Chai Xin Miao Huan Tang Jin-Jing Hu hui Zhang Wen-Ce Zhou The Forth Department of General Surgery The First Hospital of Lanzhou UniversityLanzhou 730000Gansu ProvinceChina State Key Laboratory of Veterinary Etiological Biology Key Laboratory of Animal Virology of the Ministry of AgricultureLanzhou Veterinary Research InstituteChinese Academy of Agricultural SciencesLanzhou 730000Gansu ProvinceChina The Second Clinical Medical College Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Department of General Surgery The Second Hospital of Lanzhou UniversityLanzhou 730000Gansu ProvinceChina

BAckGROUND An in-depth study of the pathogenesis and biological characteristics of ampullary carcinoma is necessary to identify appropriate treatment strategies. To date, only eight ampullary cancer cell lines have been reported, and a mixed-type ampullary carcinoma cell line has not yet been *** To establish a stable mixed-type ampullary carcinoma cell line originating from *** Fresh ampullary cancer tissue samples were used for primary culture and subculture. The cell line was evaluated by cell proliferation assays, clonal formation assays, karyotype analysis, short tandem repeat(STR) analysis and transmission electron microscopy. Drug resistances against oxaliplatin, paclitaxel, gemcitabine and 5-FU were evaluated by cell counting kit-8 assay. Subcutaneous injection 1 × 106 cells to three BALB/c nude mice for xenograft studies. The hematoxylin-eosin staining was used to detect the pathological status of the cell line. The expression of biomarkers cytokeratin 7(ck7), cytokeratin 20(ck20), cytokeratin low molecular weight(ckL), Ki67 and carcinoembryonic antigen(CEA) were determined by immunocytochemistry *** DPC-X1 was continuously cultivated for over a year and stably passaged for more than 80 generations;its population doubling time was 48 h. STR analysis demonstrated that the characteristics of DPC-X1 were highly consistent with those of the patient’s primary tumor. Furthermore, karyotype analysis revealed its abnormal sub-tetraploid karyotype. DPC-X1 could efficiently form organoids in suspension culture. Under the transmission electron microscope, microvilli and pseudopods were observed on the cell surface, and desmosomes were visible between the cells. DPC-X1 cells inoculated into BALB/C nude mice quickly formed transplanted tumors, with a tumor formation rate of 100%. Their pathological characteristics were similar to those of the primary tumor. Moreover, DPC-X1 was sensitive to oxaliplatin and paclitaxel and resistant to gemci

关键词： Ampullary carcinoma Cell line Xenograft Drug resistance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

单相三绕组永磁同步电动机的稳态性能

控制工程 2014年第1期21卷 142-147页

作者：温慧慧湖南大学电气与信息工程学院湖南长沙400082

在使用电容的单相电源供电系统的电路中,异步电机的运行是众所周知的。异步电机在单相电源供电系统中的详细研究已有文献记载[1],但是在永磁同步电动机中却较少进行这样的研究。为提高电能的利用率,解决电力不足而导致电能消耗急剧上升... 详细信息

在使用电容的单相电源供电系统的电路中,异步电机的运行是众所周知的。异步电机在单相电源供电系统中的详细研究已有文献记载[1],但是在永磁同步电动机中却较少进行这样的研究。为提高电能的利用率,解决电力不足而导致电能消耗急剧上升时,电能的高效利用率问题,对单相电源供电系统下的永磁同步电动机的稳态运行性能进行了详细研究。利用对称分量理论结合坐标变换理论进行分析,推导出在单相电源供电系统下,永磁电动机运行时所需电容值大小的几种计算方法,并对其进行比较,通过Matlab进行仿真实验。结果表明:利用最小不平衡因数和最大效率法所求得电容值为最佳电容值,可使永磁同步电机达到良好的运行性能,有效的提高了电机的效率。

关键词：永磁同步电机电动机对称分量理论运行电容稳态性能

Vagina vasorum dissection during D2 lymphadenectomy for gastric carcinoma

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第12期13卷 1867-1869页

作者： Jian-Jun Peng Yu-Long He Wen-Hua Zhan Ping Xiao Shi-Rong Cai Chang-Hua Zhang hui Wu Department of Gastrointestinal Surgery The First Affiliated Hospital Sun Yat-Sen University Guangzhou 510080 Guangdong Province China Department of Pathology The First Affiliated Hospital Sun Yat-Sen University Guangzhou 510080 Guangdong Province China

AIM: To explore the relationship between metastasis and vagina vasorum in the progress of gastric carcinoma and to find some facts and references for gastric surgeons. METHODS: One hundred and seven specimens of left or right gastric arteries (55 left and 52 right) were gathered from 59 patients undergoing radical gastrectomy for gastric carcinoma. All the frozen specimens were cut into 3 μm-thick sections and stained with hematoxylin-eosin (HE) and immunohistochemical method separately. Cytokeratin (ck) and mesothelial cells (MC) were stained with immunohistochemical method. Cancer cells inside vagina vasorum were detected and the structure of artery wall was observed under microscope. RESULTS: Metastatic cancer cells or tubercles were found inside vagina vasorum in some stage Ⅲ or Ⅳ specimens, but not in stageⅠor Ⅱ specimens. Tumor cells in vagina vasorum were ck positive in 26 specimens of 14 tumors. Among them, stage Ⅲ was found in 4 specimens of 2 tumors, and stage Ⅳ in 22 specimens of 12 tumors. None of these specimens was positive for MC. The positive rate of ck increased with TNM staging. Compared with the lower part, tumors in the upper and middle parts of stomach were more likely to metastasize into vagina vasorum. CONCLUSION: Vagina vasorum dissection should be performed during D2 lymphadenectomy for TNM stage Ⅲ or Ⅳ gastric carcinoma.

关键词： Gastric carcinoma Radical gastrectomy Vagina vasorum Lymphadenectomy Cytokeratin