Search results for: X. L. Guo

Items from 1 to 20 out of 39 results

article

Accuracy of detecting vertical root fractures in non‐root filled teeth using cone beam computed tomography: effect of voxel size and fracture width

X. L. Guo, G. Li, J. Q. Zheng, R. H. Ma, more

International Endodontic Journal > 52 > 6 > 887 - 898

Aim To investigate simultaneously the effect of voxel size and fracture width on the accuracy of detecting vertical root fractures (VRFs) in non‐root filled teeth when using cone beam computed tomography. Methodology Fifty‐one of 161 extracted human permanent teeth (16 anterior teeth, 132 premolars and 13 mandibular molars) were selected randomly for VRF induction with two fracture widths. All...

article

Development of dipole magnet power supply for BEPC-II energy upgrading project

X. L. Guo, B. Chen, C. Han, Y. Gao

Radiation Detection Technology and Methods > 2019 > 3 > 2 > 1-5

Purpose In order to make BEPC-II to run at a higher energy, the Institute of High Energy Physics undertook an upgrading project. One of the important factors limiting the energy boost is the power and performance of the dipole magnet power supplies; therefore, these four magnet power supplies are developed for the BEPC-II upgrading. Methods The power supplies adopt topologies of thyristor rectifiers...

article

Development of high-precision DC power supply prototype for HEPS-TF

X. L. Guo, F. L. Long, B. Chen, P. Liu

Radiation Detection Technology and Methods > 2019 > 3 > 2 > 1-7

Purpose This power supply prototype is developed for the quadrupole magnets in the storage ring of HEPS. The project requires a high current stability of these power supplies, in order to master the key technology of this type of power supply in advance, a prototype is made in the project of HEPS test facility. Methods Modularization is used in the prototype’s topology and a combination of digital...

article

Experimental study and numerical simulation of the corner turning of TATB based and CL-20 based polymer bonded explosives

X.-L. Guo, W. Cao, Y.-L. Duan, Y. Han, more

Combustion, Explosion, and Shock Waves > 2016 > 52 > 6 > 719-726

In order to study the corner turning performance of detonation waves for TATB (1,3,5-triamino-2,4,6-trinitrobenzene) based and CL-20 (2,4,6,8,10,12-hexanitro-2,4,6,8,10,12- hexaazaisowurtzitane) based polymer bonded explosives (PBXs with PBX-I, PBX-II, and PBX-III modifications), mushroom tests are used to obtain the first breakout angles, failure angles, and delay times with initiating diameters...

article

Functional and mutational analyses of an omega‐class glutathione S‐transferase (GSTO2) that is required for reducing oxidative damage in Apis cerana cerana

Y.‐Y. Zhang, X.‐L. Guo, Y.‐L. Liu, F. Liu, more

Insect Molecular Biology > 25 > 4 > 470 - 486

Glutathione S‐transferases perform a variety of vital functions, particularly in reducing oxidative damage. Here, we investigated the expression patterns of Apis cerana cerana omega‐class glutathione S‐transferase 2 (AccGSTO2) under various stresses and explored its connection with antioxidant defences. We found that AccGSTO2 knockdown by RNA interference triggered increased mortality in Ap. cerana cerana...

article

Numerical Study on the Quench Process of Superconducting Solenoid Magnets Protected Using Quench-Back

X. L. Guo, L. Wang, Y. Zhang

IEEE Transactions on Applied Superconductivity > 2016 > 26 > 4 > 1 - 7

Quench-back from the mandrel has been widely used in quench protection of superconducting magnets. The rational use of quench-back requires detailed understanding of the heat transfer and electromagnetic process in the magnet during a quench process. A coupled transient thermal-electromagnetic-circuit finite-element model was developed to study the quench process with quench-back. This model sequentially...

article

Ideal cardiovascular health status and its association with socioeconomic factors in Chinese adults in Shandong, China

J. Ren, X. L. Guo, Z. L. Lu, J. Y. Zhang, more

BMC Public Health > 2016 > 16 > 1 > 1-7

Background Cardiovascular disease (CVD) is the leading cause of morbidity and mortality in the world. In 2010, a goal released by the American Heart Association (AHA) Committee focused on the primary reduction in cardiovascular risk. Methods Data collected from 7683 men and 7667 women aged 18–69 years were analyzed. The distribution of ideal cardiovascular health metrics based on 7 cardiovascular...

article

Lactulose Treatment Modulates Gut Microbiome in Minimal Hepatic Encephalopathy Patients: Results from a Multi-Center Controlled Trial

J.-Y. Wang, J.-B. Wang, J. Shang, X.-M. Zhou, more

Journal of Hepatology > 2016 > 64 > 2(S) > S266

chapter

Modal analysis of out-of-plane vibrations in switchable piezoelectric Gallium Nitride micromechanical resonators

C. Tu, X.-L. Guo, J.E.-Y Lee

2015 Transducers - 2015 18th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) > 1977 - 1980

TRANSDUCERS 2015 - 2015 18th International Solid-State Sensors, Actuators and Microsystems Conference

This paper analyzes higher order out-of-plane vibrations in a piezoelectric Gallium Nitride (GaN) MEMS resonator that utilizes the two-dimensional electron gas (2DEG) as a switchable and embedded electrode. More specifically, we show that the out-of-plane vibration mode that provides the strongest electromechanical resonance (∼12MHz) has an associated stress field that allows charges generated from...

article

P1080 : Cholecystectomy is a risk factor for fatty liver disease

Y. Gao, Q.-S. Shan, Y.-J. Zhang, X. Li, more

Journal of Hepatology > 2015 > 62 > Supplement 2 > S754

article

Effects of potassium deficiency and replacement of potassium by sodium on sugar beet plants

Z. Pi, P. Stevanato, L. H. Yv, G. Geng, more

Russian Journal of Plant Physiology > 2014 > 61 > 2 > 224-230

Two sugar beet (Beta vulgaris L.) genotypes were cultivated at different K⁺/Na⁺ concentration in nutrient solutions (mM, 3/0 (control groups), 0.03/2.97 (K-Na replacement groups), and 0.03/0 (K deficiency groups)) to investigate the effects of potassium deficiency and replacement of potassium by sodium on plant growth and to explore how sodium can compensate for a lack of potassium. After 22 days...

article

On generalized $$\epsilon $$ ϵ -subdifferential and radial epiderivative of set-valued mappings

X. L. Guo, C. J. Zhao, Z. W. Li

Optimization Letters > 2014 > 8 > 5 > 1707-1720

In this paper, a generalized $$\epsilon $$ ϵ -subdifferential, which was defined by the radial epiderivative and a norm, is first introduced for a set-valued mapping. Some existence theorems of the generalized $$\epsilon $$ ϵ -subdifferential and the radial epiderivative are discussed. A relationship between the existence of the radial epiderivative and the existence of the generalized...

article

Optimality Conditions for Vector Optimization Problems with Difference of Convex Maps

X. L. Guo, S. J. Li

Journal of Optimization Theory and Applications > 2014 > 162 > 3 > 821-844

In this paper, by using the notion of strong subdifferential and epsilon-subdifferential, necessary optimality conditions are established firstly for an epsilon-weak Pareto minimal point and an epsilon-proper Pareto minimal point of a vector optimization problem, where its objective function and constraint set are denoted by using differences of two vector-valued maps, respectively. Then, by using...

article

Direct detection of chloramphenicol in honey by neutral desorption-extractive electrospray ionization mass spectrometry

X. Y. Huang, X. W. Fang, X. Zhang, X. M. Dai, more

Analytical and Bioanalytical Chemistry > 2014 > 406 > 29 > 7705-7714

Herein, we constructed a platform of neutral desorption-extractive electrospray ionization mass spectrometry (ND-EESI-MS) for direct and rapid detection of chloramphenicol (CAP) in honey samples diluted with methanol. Under the optimized working conditions, the quantitative information of CAP residues was acquired effectively by EESI-Ion Trap MSⁿ. Using heated methanol-N₂ as spray reagent, we reduced...

article

A Comparison of the Quench Analysis on an Impregnated Solenoid Magnet Wound on an Aluminum Mandrel Using Three Computer Codes

H. Pan, M. A. Green, X. L. Guo, S. O. Prestemon, more

IEEE Transactions on Applied Superconductivity > 2013 > 23 > 3-2 > 4901005

The magnet used for the quench protection comparison has an ID of 1.5 m. At a maximum current of $\sim$ 210-A, the stored energy is $\sim$ 13 MJ. The impregnated magnet coil is 281 mm long and about 105.6 mm thick. The coil is wound on a 6061-aluminum mandrel. The magnet quench protection system is passive. The magnet coil is subdivided with back-to-back diodes and resistors across each of the coil subdivision...

article

The Cooling and Safety Design of a Pair of Binary Leads for the MICE Coupling Magnets

L. Wang, S. Sun, Y. Cao, L. X. Yin, more

IEEE Transactions on Applied Superconductivity > 2012 > 22 > 3 > 4801305

The key to being able to operate the superconducting solenoids in the Muon Ionization Cooling Experiment (MICE) using cryocoolers running at around 4.2 K is the application of high temperature superconducting (HTS) leads. Because the MICE magnets are not shielded, all of them will have a stray magnetic field in the region where the coolers and the HTS leads are located. The behavior of the HTS leads...

article

Subdifferential and optimality conditions for the difference of set-valued mappings

X. L. Guo, S. J. Li, K. L. Teo

Positivity > 2012 > 16 > 2 > 321-337

In this paper, an existence theorem of the subgradients for set-valued mappings, which introduced by Borwein (Math Scand 48:189–204, 1981), and relations between this subdifferential and the subdifferential introduced by Baier and Jahn (J Optim Theory Appl 100:233–240, 1999), are obtained. By using the concept of this subdifferential, the sufficient optimality conditions for generalized D.C. multiobjective...

article

Study on the Mechanical Instability of MICE Coupling Magnets

L Wang, H Pan, X L Guo, H Wu, more

IEEE Transactions on Applied Superconductivity > 2011 > 21 > 3-2 > 2363 - 2366

The superconducting coupling solenoid magnet is one of the key equipment in the Muon Ionization Cooling Experiment (MICE). The coil has an inner radius of 750 mm, length of 281 mm and thickness of 104 mm at room temperature. The peak induction in the coil is about 7.3 T with a full current of 210 A. The mechanical disturbances which might cause the instability of the impregnated superconducting magnet...

article

The Role of Quench-Back in the Passive Quench Protection of Uncoupled Solenoids in Series With and Without Coil Sub-Division

X L Guo, M A Green, L Wang, H Wu, more

IEEE Transactions on Applied Superconductivity > 2011 > 21 > 3-2 > 2388 - 2393

This paper is the final paper in a series of papers that discusses passive quench protection for high inductance solenoid magnets. This report describes how passive quench protection system may be applied to superconducting magnets that are connected in series but not inductively coupled. Previous papers have discussed the role of magnet sub-division and quench back from a conductive mandrel in reducing...

article

Design and Analysis of a Self-Centered Cold Mass Support for the MICE Coupling Magnet

L Wang, H Wu, S Y Li, X L Guo, more

IEEE Transactions on Applied Superconductivity > 2011 > 21 > 3-2 > 2259 - 2262

The Muon Ionization Cooling Experiment (MICE) consists of eighteen superconducting solenoid coils in seven modules, which are magnetically hooked together since there is no iron to shield the coils and the return flux. The RF coupling coil (RFCC) module consists of a superconducting coupling solenoid mounted around four conventional conducting 201.25 MHz closed RF cavities. The coupling coil will...

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INFONA - science communication portal

Search results for: X. L. Guo

Accuracy of detecting vertical root fractures in non‐root filled teeth using cone beam computed tomography: effect of voxel size and fracture width

Development of dipole magnet power supply for BEPC-II energy upgrading project

Development of high-precision DC power supply prototype for HEPS-TF

Experimental study and numerical simulation of the corner turning of TATB based and CL-20 based polymer bonded explosives

Functional and mutational analyses of an omega‐class glutathione S‐transferase (GSTO2) that is required for reducing oxidative damage in Apis cerana cerana

Numerical Study on the Quench Process of Superconducting Solenoid Magnets Protected Using Quench-Back

Ideal cardiovascular health status and its association with socioeconomic factors in Chinese adults in Shandong, China

Lactulose Treatment Modulates Gut Microbiome in Minimal Hepatic Encephalopathy Patients: Results from a Multi-Center Controlled Trial

Modal analysis of out-of-plane vibrations in switchable piezoelectric Gallium Nitride micromechanical resonators

P1080 : Cholecystectomy is a risk factor for fatty liver disease

Effects of potassium deficiency and replacement of potassium by sodium on sugar beet plants

On generalized $$\epsilon $$ ϵ -subdifferential and radial epiderivative of set-valued mappings

Optimality Conditions for Vector Optimization Problems with Difference of Convex Maps

Direct detection of chloramphenicol in honey by neutral desorption-extractive electrospray ionization mass spectrometry

A Comparison of the Quench Analysis on an Impregnated Solenoid Magnet Wound on an Aluminum Mandrel Using Three Computer Codes

The Cooling and Safety Design of a Pair of Binary Leads for the MICE Coupling Magnets

Subdifferential and optimality conditions for the difference of set-valued mappings

Study on the Mechanical Instability of MICE Coupling Magnets

The Role of Quench-Back in the Passive Quench Protection of Uncoupled Solenoids in Series With and Without Coil Sub-Division

Design and Analysis of a Self-Centered Cold Mass Support for the MICE Coupling Magnet

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