检索结果-南通市图书馆

Profile Distributions of Dissolved and Colloidal Phosphorus as Affected by Degree of Phosphorus Saturation in Paddy Soil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2013年第1期23卷 128-136页

作者： ZANG Ling TIAN Guang-Ming LIANG Xin-Qing HE Miao-Miao BAO Qi-Bei yao jin-Hua Department of Environmental Engineering Zhejiang University

Soil dissolved phosphorus (P) and colloidal P mobilization could be closely related to the degree of phosphorus saturation (DPS). Effects of a wide range of DPS on the distributions of dissolved P and colloidal P in a paddy soil profile were investigated in this study. Dissolved P and colloidal P in water-dispersible soil colloid suspension increased obviously with increasing DPS. The change point of DPS was at 0.12 by using a split-line model. Above the value, dissolved P (3.1 mg P kg-1 ) in soil profile would increase sharply and then transfer downward. Compared with dissolved P, colloidal P was the dominant fraction (78%-91%) of P in soil colloid suspension, and positively related to DPS without a significant change point. The high release of colloids in subsoils with low DPS was attributed to the low ionic strength and high pH value in subsoils. The DPS also had a significant and positive correlation with electrical conductivity (EC), but it showed a negative correlation with pH value. However, the concentration of colloidal P was not greatly correlated to the pH value, EC and optical density of the soil colloid suspension. The results indicated that DPS was an important factor that may affect the accumulation and mobilization of water-extractable colloidal P and dissolved P.

关键词： inorganic fertilizer ionic strength manure split-line model water-dispersible soil colloid

Characterization and reactivity of γ-Al_2O_3 supported Pd–Ni bimetallic nanocatalysts for selective hydrogenation of cyclopentadiene

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2015年第6期26卷 709-713页

作者： Yi-Si Feng Jian Hao Wei-Wei Liu Yun-jin yao Yue Cheng Hua-Jian Xu School of Chemistry and Chemical Engineering School of Medical EngineeringHefei University of Technology Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering Anhui Provincial Laboratory of Heterocyclic Chemistry

Several γ-Al2O3 supported Pd-Ni bimetallic nanocatalysts （Pd-Ni （x：y）[Al2O3; where x and y represent the mass ratio of Pd and Ni, respectively） were prepared by the impregnation method and used for selective hydrogenation of cyclopentadiene to cyclopentene. The Pd-NiJAl2O3 samples were confirmed to generate Pd-Ni bimetallic nanoparticles by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and transmission electron microscopy （TEM）. The catalytic activity was assessed in view of the effects of different mass ratios of Pd and Ni, temperature, pressure, etc. Among all the samples, the Pd-Ni （1：1 ）/Al2O3 （PN-1：1 ） catalyst showed extremely high catalytic ability. The conversion of cyclopentadiene and selectivity for cyclopentene can be simultaneously more than 90%.

关键词： Impregnation method Hydrogenation Cyclopentadiene Cyclopentene Pd-Ni/Al2O3

Experiment on mechanical properties of steel fiber reinforced concrete and application in deep underground engineering

在线全文

学校读者我要写书评

暂无评论

Journal of China University of Mining and Technology 2008年第1期18卷 64-66,81页

作者： WANG Qi-sheng LI Xi-bing ZhAO Guo-yan SHAO Peng yao jin-rui College of Resourcesand Safety Engineering Central South University Changsha Hunan 410083 China Henan Polytechnic University Jiaozuo Henan 454000 China Guizhou Kaiyang Phosphor Mine Group Co. Guiyang Guizhou 532000 China

Specimens of steel fiber reinforced concrete （SFRC） in volume ratios of 0%, 0.5%, 1% and 1.5% were prepared to study the supporting effect of SFRC at these diffterent volume ratios in a deep soft rock tunnel. Experiments with mechanical properties of compressive strength in cubic specimens, cleave strength in cylindrical specimens and four-point flexure strength of sheet metal specimens were carded out. The experimental results indicate that SFRC in a volume ratio of 1% is superior in ranking to other volume ratios in terms of technique and economics. By means of a numerical simulation, given the characteristics of soft rock deformation and damage at great depth, a new support substitution scheme of SFRC to replace plain concrete is proposed. The results of an industrial trial show that the support provided by SFRC can withstand large deformations of the surrounding rock. Good resuits have been obtained in a practical anplication.

关键词： volume ratio steel fiber concrete mechanical performance experiment great depth soft rock tunnel

Researches On The Design And Application Of DSP Multi- motor Collaborative Control System

在线全文

学校读者我要写书评

暂无评论

International Journal of Technology Management 2014年第8期 4-6页

作者： jin yao WuZhou University

As an important branch in the field of servo control, multi-motor coordination motion control applications are increasingly *** open CNC system requirement, taking DSP as master core, combing with specific integrated stepper motor driver chip LMDI8201T, this designed a serial communication-based new collaborative multi-motor control system, which has characters of highly integrated, good stability, real-time, convenient man-machine *** test results show that the system fully meet performance requirements and achieved the motion control functions.

关键词： Dual DSP multi-motor coordinated control simulation

Edaravone combined with Schwann cell transplantation may repair spinal cord injury in rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2015年第2期10卷 230-236页

作者： Shu-quan Zhang Min-fei Wu Zhe Piao jin yao Ji-hai Li Xin-gang Wang Jun Liu Department of Orthopedics Tianjin Nankai Hospital Department of Spine Surgery Orthopedic Hospital Second Hospital Clinical Hospital Jilin University Department of Burns and Plastic Surgery China-Japan Union Hospital Jilin University Department of Hand and Foot Surgery and Reparative & Reconstructive Surgery Center Orthopedic Hospital Second Hospital Clinical Hospital Jilin University

Edaravone has been shown to delay neuronal apoptosis, thereby improving nerve function and the microenvironment after spinal cord injury. Edaravone can provide a favorable environment for theAa：eatment of spinal cord injury using Schwann cell transplantation. This study used rat models of complete spinal cord transection at T9. Six hours later, Schwann cells were transplanted in the head and tail ends of the injury site. Simultaneously, edaravone was injected through the caudal vein. Eight weeks later, the PKH-26-1abeled Schwann cells had survived and migrated to the center of the spinal cord injury region in rats after combined treatment with edaravone and Schwann cells. Moreover, the number of PKH-26-1abeled Schwann cells in the rat spinal cord was more than that in rats undergoing Schwann cell transplantation alone or rats without any treatment. Horseradish peroxidase retrograde tracing revealed that the number of horserad- ish peroxidase-positive nerve fibers was greater in rats treated with edaravone combined with Schwann cells than in rats with Schwann cell transplantation alone. The results demonstrated that lower extremity motor function and neurophysiological function were better in rats treated with edaravone and Schwann cells than in rats with Schwann cell transplantation only. These data confirmed that Schwann cell transplantation combined with edaravone injection promoted the regeneration of nerve fibers of rats with spinal cord injury and improved neurological function.

关键词： nerve regeneration spinal cord injury Schwann cells cell transplantation edaravone motor function electrophysiological function neural regeneration

Metalenses phase characterization by multidistance phase retrieval

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第9期13卷 1898-1907页

作者： Bowen Liu Jialuo Cheng Maoxiong Zhao jin yao Xiaoyuan Liu Shaohu Chen Lei Shi Din Ping Tsai Zihan Geng Mu Ku Chen State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan University200433 ShanghaiChina Department of Electrical Engineering City University of Hong KongKowloonHong Kong SARChina State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong SARChina Institute for Nanoelectronic Devices and Quantum Computing Fudan University200438 ShanghaiChina Collaborative Innovation Center of Advanced Microstructures Nanjing University210093 NanjingJiangsuChina Shanghai Research Center for Quantum Sciences 201315 ShanghaiChina Centre for Biosystems Neuroscienceand NanotechnologyCity University of Hong KongKowloonHong Kong SARChina Institute of Data and Information Tsinghua Shenzhen International Graduate SchoolTsinghua University518071 ShenzhenGuangdongChina

Metalens,characterized by their unique functions and distinctive physical properties,have gained significant attention for their potential *** further optimize the performance of metalens,it is necessary to characterize the phase modulation of the *** this study,we present a multi-distance phase retrieval system based on optical field scanning and discuss its convergence and *** findings indicate that the system is capable of retrieving the phase distribution of the metalens as long as the measurement noise is low and the total length of the scanned light field is sufficiently *** system enables the analysis of focal length and aberration by utilizing the computed phase *** extend our investigation to measure the phase distribution of the metalens operating in the near-infrared(NIR)spectrum and identify the impact of defects in the sample on the ***,we conduct a comparative analysis of the phase distribution of the metalens in air and ethanol and observe the variations in the phase modulation of the metalens in different working *** system provides a straightforward method for the phase characterization of metalens,aiding in optimizing the metalens design and functionality.

关键词： phase system distribution

Researches On The Robot Obstacle Avoidance Based On Fuzzy Control

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Technology Management 2014年第7期 62-63页

作者： jin yao WuZhou University

With the continuous development of modem sensor technology, coupled with the integration of artificial intelligence and a variety of emerging computer technology, it makes robots more intelligent and *** the ability of the robot to complete the task is also valued and widely *** this paper, the whole covered area of the local path planning uses a fuzzy control algorithm,which uses the robustness and an action of perception based on the biological behavior of the fuzzy control algorithm combined with *** obstacle avoidance system of mobile robots,we put forward the avoidance strategy of fully contacting the *** we have conducted a deep study about the theory and implementation methods.

关键词： Mobile robot full area coverage path planning obstacle avoidance

Molecular and functional comparisons of the vacuolar Na^+/H^+ exchangers originated from glycophytic and halophytic species

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 Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第2期9卷 132-140页

作者： jin-yao LI Xiao-wei HE Li XU Jie ZHOU Ping WU Hui-xia SHOU Fu-chun ZHANG State Key Laboratory of Plant Physiology and Biochemistry College of Life Sciences Zhejiang University Hangzhou 310058 China Key Laboratory of Molecular Biology College of Life Science and Technology Xinjiang University Urumqi 830046 China

A novel vacuolar Na+/H+ exchanger, CgNHX1, was cloned from a halophytic species Chenopodium glaucum by using reverse transcriptase-polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE) technique. Sequence alignment and phylogenetic analysis of 22 NHX genes from GenBank as well as the new CgNHX1 gene indicate that NHX genes shared a great degree of similarity, regardless of their glycophytic or halophytic origin. Expression of the CgNHX1 gene was induced by NaCl and peaked at 400 mmol/L NaCl. Overexpression of NHX1 genes in rice enhanced their tolerance to salt stress. However, there is no significant difference in salt tolerance among the transgenic rice plants overexpressing the NHX1 genes from either glycophytic or halophytic species. The Na+ content of both the wild type (WT) and transgenic plants increased when exposed to 50 and 100 mmol/L NaCl, and the Na+ concentration in transgenic plants was marginally higher than that of WT. Our data demonstrate that the overexpression of the NHX1 gene from either glycophytic or halophytic species resulted in the enhanced tolerance to salt stress at a similar level, suggesting that NHX gene per se might not be the reason accounting for the difference in salt tolerance between glycophytes and halophytes.

关键词： NHX gene Rice transformation Salt stress Tolerance

Researches On The Optimal Design Of Intersection Signal Lights Fuzzy Control

在线全文

学校读者我要写书评

暂无评论

International Journal of Technology Management 2014年第9期 1-2页

作者： jin yao WuZhou University

Fuzzy control is an important branch of intelligent control, and this paper describes the application of fuzzy pattern study in intelligent control, begins with a brief overview introduction for development of intelligent control, and then describes the main components of the fuzzy model and its characteristics and fuzzy pattern control *** pattern applications in the intersection signal intelligent control showed fuzzy mode control can effectively reduce the single intersection average vehicle delay time, making the intersection more unobstructed to pass.

关键词： intelligent control fuzzy pattern traffic lights