检索结果-南通市图书馆

Journal of Forestry Research 2012年第1期23卷 95-101页

作者： ZHAO Guang-wu · zhong Tai-lin College of Agriculture and Food Science Zhejiang Agriculture andForestry University Lin'an 311300 People's Republic of China

Oxygen sensing technology was employed to study the rapid methods for seed vigor assessment of Chinese fir （Cunninghamia lanceolata） and Masson pine （Pinus massoniana）. Firstly, seeds of five lots were performed using accelerated aging （AA） into three vigor levels. Then, four oxygen sensing indices, including increased metabolism time （IMT）, oxygen metabolism rate （OMR）, critical oxygen pressure （COP）, relative germination time （RGT） and the control indiees such as labora- tory germination indices, dehydrogenase activity （DA）, and electrical conductivity （EC） were analyzed by the tests of 15 samples. The results of correlation analysis between these indices and field emergence per- formances based on two-year and two-spot data showed that RGT and OMR should be indicated as the optimal oxygen sensing indices to rap- idly and automatically evaluate seed vigor of Chinese fir and Masson pine, respectively. On the basis, one-variable linear regression equations were built to forecast their field emergence performances by the two oxygen sensing indices.

关键词： Cunninghamia lanceolata Pinus massoniana seed vigor oxygen sensing

Recent Progress on the Maxwell’s Equations for Describing a Mechano-Driven Medium System with Multiple Moving Objects/Media

在线全文

学校读者我要写书评

暂无评论

Electromagnetic Science 2023年第2期1卷 1-16页

作者： zhong lin Wang Jiajia Shao Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China Georgia Institute of Technology AtlantaGeorgia 30332-0245USA School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China

Maxwell’s equations for a mechano-driven media system(MEs-f-MDMS)have been used to characterize the electromagnetism of multislow-moving media that may be accelerated with complex *** an approach starts from the integral forms of the four physics laws and is different from the classical approach of using the Lorentz transformation for correlating the electromagnetic phenomena observed in two inertial reference frames with relative *** governing equations inside the moving object/medium are the MEs-f-MDMS,and those in vacuum are the classical Maxwell’s equations;the full solutions of both reconcile at the medium surface/interface and satisfy the boundary *** paper reviews the background,physical principle,and mathematical derivations for formulating the *** are also presented for mathematically solving the *** unique advances made by the MEs-f-MDMS have been systematically summarized,as are their potential applications in *** found that the Lorentz transformation is perfect for treating the electromagnetic phenomena of moving point charges in vacuum;however,for moving objects,the covariance of Maxwell’s equations may not hold,and use of the MEs-f-MDMS may be required if the velocity is ***,recent advances for treating the boundary conditions at the nanoscale without assuming an abrupt boundary are also reviewed.

关键词： Maxwell’s equations for a mechano-driven medium system(MEs-f-MDMS) Maxwell’s equations Lorentz transformation Noninertia reference frame Special relativity Triboelectric nanogenerator(TENG).

Super-high bed sintering for iron ores:problems ascertainment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第5期31卷 1063-1070页

作者： Liang-ping Xu Hui-bo Liu Yu-chao Zhao Qiang zhong zhong-lin Dong Guang-hui Li Tao Jiang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina

Super-high bed sintering process is an important development direction of iron ore sintering for its lower emission and higher ***,there is a lack of deep understanding of the uneven quality of super-high bed sintering products,and the deterioration of reduction disintegration performance,the thickening of hearth layer and the reduction in energy-saving effect are perplexing enterprises and *** ascertain the problems of super-high bed sintering,ten sintering machines with the areas of 265,280,360,550 and 660 m^(2)and bed depth above 900 mm were sampled and *** results showed that problems were mainly shown in the unevenness of chemical composition,macrostructure,mechanical strength and metallurgical *** chemical composition exhibits severe segregation in both horizontal and vertical directions,with basicity segregation reaching as high as *** uneven macrostructure of sinter is reflected in a 10%difference in porosity and mechanical strength increase in 16%–19%along the vertical *** reducibility and reduction disintegration performance gradually deteriorate along the bed depth,with a difference of 10.5%in reducibility and 7.3%in RDI−0.5 mm(reduction disintegration index of sinter with size smaller than 0.5 mm).

关键词： Super-high bed sintering Uneven sinter performance Segregation Agglomeration Iron ore

Detection of large color variation in the potentially hazardous asteroid(297274) 1996 SK

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2014年第3期14卷 311-318页

作者： Chien-Hsien lin Wing-Huen Ip zhong-Yi lin Fumi Yoshida Yu-Chi Cheng Space Science Institute Macao University of Science and Technology Institute of Astronomy National Central University National Astronomical Observatory Osawa MitakaTokyo

Low-inclination near-earth asteroid （NEA）（297274） 1996 SK, which isalso classified as a potentially hazardous asteroid, has a highly eccentric orbit. Itwas studied by multi-wavelength photometry within the framework of an NEA colorsurvey at Lulin Observatory. Here, we report the finding of large color variationacross the surface of （297274） 1996 SK within one asteroidal rotation period of4.656 ± 0.122 hours and classify it as an S-type asteroid according to its averagecolors ofB - V = 0.767 ± 0.033, V - R = 0.482 ± 0.021, V - I = 0.801 ± 0.025and the corresponding relative reflectance spectrum. These results might be indica-tive of differential space weathering or compositional inhomogeneity in the surfacematerials.

关键词： minor planets, asteroids: individual: PHA (297274) techniques: photometric

Three-dimensional arterial spin labeling and diffusion kurtosis imaging in evaluating perfusion and infarct area size in acute cerebral ischemia

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第17期10卷 5586-5594页

作者： Yan-Yan Jiang Zhi-lin zhong Min Zuo Department of Magnetic Resonance Wuhan Asia General HospitalWuhan 430056Hubei ProvinceChina Department of Radiology Wuhan Yaxin General HospitalWuhan 430056Hubei ProvinceChina Department of Radiology Wuhan Hanyang HospitalWuhan University of Science and TechnologyWuhan 430050Hubei ProvinceChina

BACKGROUND Early thrombolytic therapy is crucial to treat acute cerebral infarction,especially since the onset of thrombolytic therapy takes 1-6 ***,early diagnosis and evaluation of cerebral infarction is *** To investigate the diagnostic value of magnetic resonance multi-delay threedimensional arterial spin labeling(3DASL)and diffusion kurtosis imaging(DKI)in evaluating the perfusion and infarct area size in patients with acute cerebral *** Eighty-four patients who experienced acute cerebral ischemia from March 2019 to February 2021 were *** patients in the acute stage underwent magnetic resonance-based examination,and the data were processed by the system’s own *** apparent diffusion coefficient(ADC),average diffusion coefficient(MD),axial diffusion(AD),radial diffusion(RD),average kurtosis(MK),radial kurtosis(fairly RK),axial kurtosis(AK),and perfusion parameters post-labeling delays(PLD)in the focal area and its corresponding area were *** correlation between the lesion area of cerebral infarction under MK and MD and T2-weighted imaging(T2WI)was *** The DKI parameters of focal and control areas in the study subjects were *** ADC,MD,AD,and RD values in the lesion area were significantly lower than those in the control *** MK,RK,and AK values in the lesion area were significantly higher than those in the control *** MK/MD value in the infarct lesions was used to determine the matching ***/MD<5 mm was considered matching and MK/MD≥5 mm was considered ***1.5s and PLD2.5s perfusion parameters in the central,peripheral,and control areas of the infarct lesions in MK/MD-matched and-unmatched patients were not significantly ***1.5s and PLD2.5s perfusion parameter values in the central area of the infarct lesions in MK/MD-matched and-unmatched patients were significantly lower than those in peripheral and control *** MK and MD maps showed a lesio

关键词： Magnetic resonance Multi-delay 3D arterial spin labeling Diffusion kurtosis imaging Acute ischemic cerebral infarction Perfusion Nerve function

Transarterial embolization and low-dose continuous hepatic arterial infusion chemotherapy with oxaliplatin and raltitrexed for hepatocellular carcinoma with major portal vein tumor thrombus

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2018年第23期24卷 2501-2507页

作者： lin-zhong Zhu Song Xu Hai-Long Qian Department of Interventional Therapy Beijing Cancer Hospital Department of Radiology Yunnan Second People’s Hospital Interventional Therapy Baotou Cancer Hospital

AIM To determine the efficacy and safety of transarterial embolization and low-dose continuous hepatic arterial infusion chemotherapy with oxaliplatin and raltitrexed in hepatocellular carcinoma(HCC) with major portal vein tumor thrombus(MPVTT).METHODS eighty-six patients with MPVTT accepted routine embolization. The catheter was kept in the hepatic artery and oxaliplatin(50 mg in 250 m L of glucose) was infused by pump for 4 h,followed by raltitrexed(2 mg in 100 m L of 0.9% saline) infusion by pump for the next 1 h. The efficacy and safety were evaluated afterthe transarterial chemoembolization(TACe).RESULTS Full or partial embolization was achieved in 86 cases,where all the cases received low dose continuous hepatic arterial infusion chemotherapy. Complete responses(CRs),partial responses(PRs),stable disease(SD),and disease progression(PD) for intrahepatic disease were observed in 0,45,20,and 21 patients,respectively. The 1-,2-and 3-year overall survival rates of the 86 patients were 40.7%,22.1%,and 8.1% respectively,and the median survival time was 8.7 mo. Complication was limited. CONCLUSION TACE with low dose continuous hepatic arterial infusion of oxaliplatin and raltitrexed could be an option in MPVTT patient; it was shown to be effective in patients with advanced HCC with MPVTT with less toxicity.

关键词： Transarterial embolization Oxaliplatin Major portal vein tumor thrombus Raltitrexed Continuous hepatic arterial infusion chemotherapy

The vertical structure and seasonal changes of atmosphere ozone and temperature at zhongshan Station over East Antarctica

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2012年第2期55卷 262-270页

作者： BIAN linGen lin zhong ZHANG DongQi ZHENG XiangDong LU LongHua State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China

The vertical structure of the atmospheric ozone and temperature as well as the seasonal variations is presented by using ozone sounding data at zhongshan Station over East Antarctica from February, 2008 to February, 2009. The results show that the heights of thermal tropopause and ozone tropopause are mostly the same with yearly mean 7.9 and 7.4 km separately above the station. There is obvious seasonal variation in the pressure and temperature of the tropopause, manifested by the clear one-wave pattern with an opposite phase. As the turning point of the tropopause temperature is visible in autumn and faint in spring and winter, the tropopause height can be better confirmed by utilization of the changes of ozone. Seasonal variation of the tropospheric ozone of vertical distribution is not clear, relative to stratosphere. In the spring, ozone in the low level of stratosphere lost seriously. The minimum partial ozone in 14 km was 1.57 MPa only and the maximum partial ozone occurred in the up level stratosphere. In the rest of the season the ozone increases with height rising in the low level of stratosphere. The evidence shows that ozone lost in spring is closely related with low temperature of polar night and the process of PSC photochemical destruction ozone in the stratosphere. From the vertical characteristics and seasonal variation of ozone and temperature, it is meaningful to understand formation and development of Antarctic ozone deletion.

关键词： Antarctica atmospheric ozone and temperature vertical structure seasonal variation

Twinning Behavior of a Basal Textured Commercially Pure Titanium Alloy TA2 at Ambient and Cryogenic Temperatures

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第1期23卷 74-77页

作者： Jin-ru LUO Xiao SONG lin-zhong ZHUANG Ji-shan ZHANG State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

Twinning greatly affects the microstructure and mechanical performance of titanium *** twinning behavior of a basal textured commercially pure titanium TA2 plates rolled to 4% reduction at the ambient and cryogenic temperatures has been *** of the rolled samples were investigated by optical microscope（OM）and the twinning analysis was carried out based on orientation data collected by electron back-scatter diffraction（EBSD）.{1122}contraction twins,{1124}contraction twins and {1012}extension twins have been *** mode activity varied with rolling *** is considered as the dominant deformation mechanism during rolling at both temperatures for the strain *** proportion of grains activates twinning during cryorolling,and greater number and more diverse types of twins are observed;manifestly related to the suppression of dislocation slips at the cryogenic temperature.{1122}contraction twins are the dominate twin type within samples rolled at both ***{1124}contraction twins are observed in the cryorolled sample while there are only a few in the sample rolled at room temperature.A few tiny{1012}twins have been identified in both samples.{1124}contraction twins are preferentially activated at cryogenic deformation temperature and the{1012}extension twins may result in local strain accommodation.

关键词： titanium rolling twinning cryogenic temperature

Cyclization and halogenation of substituted o-allylphenols with diacetoxyiodobenzene in the presence of iodine or bromine

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第6期19卷 661-664页

作者： Qi zhong Zhou Chun lin He Zhen Chu Chen Department of Chemistry Zhejiang University Hangzhou 310027 China

Substituted 2-halomethyl-2,3-dihydrobenzofurans were synthesized in one pot and in mild yield from substituted o-allylphenols with diacetoxyiodobenzene in the presence of 12 or Br2 in dry CH2Cl2 under reflux.

关键词： 2-Halomethyl-2,3-dihydrobcnzofuran Diacetoxyiodobenzene Cyclization Halogenation

Stability and Hopf Bifurcation Analysis of a Predator-Prey Model with Time Delayed Incomplete Trophic Transfer

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2015年第1期31卷 235-246页

作者： Chang-qin ZHANG Liping LIU Ping YAN lin-zhong ZHANG School of Sciences Anhui Agricultural University Department of Mathematics Lakehead University

A new nonlinear predator-prey model with incomplete trophic transfer is introduced. In this model, we assume that the rate of the trophic absorption of the predator is less than the rate of the conversion of consumed prey to predator in the Ivlev-type functional responses. The existence and uniqueness of the positive equilibrium of the model and the stability of the equilibrium of the model are studied under various conditions. Hopf bifurcation analysis of the delayed model is provided.

关键词： incomplete trophic transfer time delay Ivlev-type existence and uniqueness stability Hopfbifurcation