检索结果-南通市图书馆

Monte Carlo simulations of electromagnetically induced transparency in a square lattice of Rydberg atoms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第7期30卷 283-288页

作者： shang-yu Zhai Jin-Hui Wu Center for Quantum Sciences Northeast Normal UniversityChangchun 130117China School of Physics Northeast Normal UniversityChangchun 130024China

We study the steady optical response of a square lattice in which all trapped atoms are driven by a probe and a coupling fields into the ladder configuration of electromagnetically induced transparency(EIT).It turns out to be a manybody problem in the presence of van der Waals(vd W)interaction among atoms in the upmost Rydberg state,so Monte Carlo(MC)calculation based on density matrix equations have been done after introducing a sufficiently large cut-off *** is found that the absorption and dispersion of EIT spectra depends critically on a few key parameters like lattice dimension,unitary vd W shift,probe Rabi frequency,and coupling *** modulating these parameters,it is viable to change symmetries of the absorption and dispersion spectra and control on demand depth and position of the transparency *** MC calculation is expected to be instructive in understanding many-body quantum coherence effects and in manipulating non-equilibrium quantum phenomena by utilizing vd W interactions of Rydberg atoms.

关键词： electromagnetically induced transparency Rydberg atomic lattices Monte Carlo simulations

Effect of antidepressants on body weight, ethology and tumor growth of human pancreatic carcinoma xenografts in nude mice

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第27期14卷 4377-4382页

作者： Lin Jia yuan-yuan shang yu-yuan Li Department of Digestive Diseases Guangzhou Municipal First People's Hospital Guangzhou Medical College Guangzhou 510180 Guangdong Province China

AIM: To investigate the effects of mirtazapine and fluoxetine, representatives of the noradrenergic and specific serotonergic antidepressant (NaSSA) and se- lective serotonin reuptake inhibitor (SSRI) antidepres- sant respectively, on body weight, ingestive behavior, locomotor activity and tumor growth of human pancre- atic carcinoma xenografts in nude mice. METHODS: A subcutaneous xenograft model of hu- man pancreatic cancer cell line SW1990 was estab- lished in nude mice. The tumor-bearing mice were ran- domly divided into mirtazapine group [10 mg/(kg·d)], fluoxetine group [10 mg/(kg·d)] and control group (an equivalent normal saline solution) (7 mice in each group). Doses of all drugs were administered orally, once a day for 42 d. Tumor volume and body weight were measured biweekly. Food intake was recorded once a week. Locomotor activity was detected weekly using an open field test (OFT). RESULTS: Compared to the fluoxetine, mirtazapine significantly increased food intake from d 14 to 42 and attenuated the rate of weight loss from d 28 to 42 (t = 4.38, P < 0.05). Compared to the control group, food intake was significantly suppressed from d 21 to 42 and weight loss was promoted from d 35 to 42 in the fluoxetine group (t = 2.52, P < 0.05). There was a significant difference in body weight of the mice after removal of tumors among the three groups. The body weight of mice was the heaviest (13.66 ± 1.55 g) in the mirtazapine group and the lightest (11.39 ± 1.45 g) in the fluoxetine group (F(2,12) = 11.43, P < 0.01). The behavioral test on d 7 showed that the horizontal and vertical activities were significantly increased in the mirtazapine group compared with the fluoxetine and control groups (F(2,18) = 10.89, P < 0.01). These effects disappeared in the mirtazapine and fluoxetine groups during 2-6 wk. The grooming activity was higher in the mirtazapine group than in the fluoxetine group (10.1 ± 2.1 vs 7.1 ± 1.9 ) (t = 2.40, P < 0.05) in the second week. There was n

关键词： Pancreatic carcinoma Mirtazapine Fluoxetine Body weight Nude mice Locomotor activity Ethology

Quantum XY Spin Glass with Ferromagnetic Coupling in External Field

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1998年第12期15卷 919-921页

作者： shang yu-min YAO Kai-lun Department of Physics Huazhong University of Science and TechnologyWuhan 430074

The quantum XY spin glass model with ferromagnetic coupling in an external field is investigated *** susceptibility exhibits the typical spin glass feature,the cusp of the transverse susceptibility corresponding to the phase transition is shifted to lower temperature by increasing *** addition to the crossover feature observed in CuMn,the specific heat exhibits the 2-dimensional Ising model-like feature.

关键词： field. susceptibility ferromagnetic

Quantum XY Spin Glass Model with Longitudinal Ferromagnetic Coupling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第5期16卷 378-380页

作者： shang yu-min YAO Kai-lun Department of Physics Huazhong University of Science and Technology Wuhan 430074 CCAST(World Laboratory) P.O.Box 8730Beijing 100080 International Center for Material Physics Chinese Academy of SciencesShenyang 110015

The quantum XY spin glass model with longitudinal ferromagnetic coupling is investigated in static replica symmetry *** thermodynamic quantities are calculated *** find that the ferromagnetic coupling enhances the stability of replica symmetric solution.A 2-dimensional Ising model like transition is found,which demonstrates that the ferromagnetic coupling increases the order of spin glass *** by the ferromagnetic coupling,transverse component of the susceptibility has two cusps corresponding to transverse-longitudinal spin-glass phase transition and longitudinal spin glass-paramagnetic transition separately.

关键词： solution. ferromagnetic coupling

The gut microbiome:implications for neurogenesis and neurological diseases

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 2022年第1期17卷 53-58页

作者： Cheng Liu shang-yu Yang Long Wang Fang Zhou Department of Healthcare Administration College of Medical and Health ScienceAsia UniversityTaichungTaiwanChina Department of Anesthesiology Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

There is an increasing recognition of the strong links between the gut microbiome and the brain,and there is persuasive evidence that the gut microbiome plays a role in a variety of physiological processes in the central nervous *** review summarizes findings that gut microbial composition alterations are linked to hippocampal neurogenesis,as well as the possible mechanisms of action;the existing literature suggests that microbiota influence neurogenic processes,which can result in neurological *** consider this evidence from the perspectives of neuroinflammation,microbial-derived metabolites,neurotrophins,and *** on the existing research,we propose that the administration of probiotics can normalize the gut *** could therefore also represent a promising treatment strategy to counteract neurological impairment.

关键词： gut microbiota microbial-derived metabolites microbiota-gut-brain axis neurogenesis neuroinflammation neurological diseases neurotrophins probiotics

Dielectric,magnetic and microwave absorbing properties of polyaniline-Co0.7Cr0.1Zn0.2Fe2O4 composites

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2017年第2期36卷 118-122页

作者： Rui-Ting Ma Huai-yu shang Xiao Wang Dan Jiang School of Materials Science and Engineering Shenyang Ligong UniversityShenyang 110159China

The spinel cobalt chromium zinc ferrites（Co0.7Cr0.1Zn0.2Fe2O4） and the polyaniline（PANI）-Co0.7Cr0.1Zn0.2Fe2O4 composites were prepared by polyacrylamide gel and an in situ polymerization method,*** structure of the synthesized material was characterized by X-ray diffraction（XRD） and Fourier transform infrared spectrometer（FTIR）,which shows that the spinel Co0.7Cr0.1Zn0.2Fe2O4 ferrites and the PANI Co0.7Cr0.1Zn0.2Fe2O4 composites are *** a small amount of Co^2＋ in the octahedron ferrite is replaced by Cr^3＋,the lattice constant of Co0.8Cr0.2Zn0.2Fe2O4 ferrites reduces from0.8409 to 0.8377 *** magnetic properties of the two materials were investigated by vibrating sample magnetometer（VSM）.The VSM results confirm that the saturation magnetization（Ms）,remanent magnetization（Mr） and coercive force（Hc） of the PANI-Co0.7Cr0.1Zn0.2Fe2O4composites are 8.80 mA·m^2·g^-1,3.14 mA·m^2·g^-1 and37.22 kA·m^-1,respectively,which are smaller than those of the Co0.7Cr0.1Zn0.2Fe2O4 *** microwave absorbing capability of the two materials was studied by waveguide *** the frequency range of 5-20 GHz,two reflection loss maximum values of the PANI-Co0.7Cr0.1Zn0.2Fe2O4 composites appear at 14.1 and 17.9 GHz with-13.17 and-15.36 dB,respectively,which are obviously higher than those of the Co0.7Cr0.1Zn0.2Fe2O4 ferrites.

关键词： Composites Microwave absorbing properties Dielectric properties Magnetic properties

MXene:Promising materials for magnesium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第5期69卷 199-211页

作者： Liuyu Song Haibo Li Pengkai Wang yu shang yue Yang Zhaoyu Wu School of Resources and Civil Engineering Northeastern UniversityShenyang 110004China

Magnesium-ion batteries(MIBs)have attracted extensive attention due to their high theoretical capacity,superior safety,and low ***,the development of MIBs is hindered by the lack of cathode materials with long cycle life and rate *** stands out as a prime choice for MIB cathode or collector for anode-free magnesium batteries(AFMBs)because of its larger surface area,adjustable surface properties,and good electrical *** this paper,we summarized the preparation and layering methods of MXene and discussed the prospects of MXene as a cathode or collector for *** review will be immensely beneficial in critically analyzing the synthesis techniques and the applications of MXene material as MIB cathode or AFMB *** addition,the challenges of the preparation and layering were concluded,along with raising the research strategies of MXene for storing Mg ions.

关键词： MXene Nanomaterials Electrochemistry Optimization Magnesium-ion batteries(MIBs)

Synthesis and Crystal Structure of 5-[(1H-1,2,4-Triazol-1- yl)methyl]-4-(2,3-dimethoxybenzylideneamino)-2-2H-1,2,4-triazole-3(4H)-thione Monohydrate

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第6期25卷 673-676页

作者： XU Liang-Zhong shang yu-Qing yu Guan-Ping LI Kai SI Guo-Dong College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 China

The title compound 5-[（1H-1,2,4-triazol-1-yl）methyl]-4-（2,3-dimethoxy-benzylideneamino）- 2H-1,2,4-triazole-3（4H）-thione monohydrate 4 has been synthesized by the treatment of 4-amino-3-（ 1,2,4-triazol- 1-yl）- 1 H- 1,2,4-triazole-5（4H）-thione 3 with 2,3-dimethoxybenzaldehyde. It crystallizes as a monohydrate in the triclinic system, space group P1^- with a = 8.147（2）, b = 10.820（2）, c = 10.835（2）A, α= 73.770（6）, β = 84.916（7）,γ = 70.679（6）°, C14H17N7O35, Mr = 363.41, V= 865.4（2）A^3, Z= 2, Dc = 1.395 g/cm^3, F（000） = 380, μ = 0.217 mm^-1, the final R = 0.0400 and wR = 0.0975 for 3454 unique reflections. The dihedral angles made by the thione-substituted triazole ring with the other triazole ring and benzene ring are 74.92（3） and 14.81（2）°, respectively. There are some weak hydrogen bonds and C-H..π supramolecular interactions in the lattice, forming a three-dimensional network, which stabilizes the crystal structure.

关键词： 1,2,4-triazole crystal structure synthesis

Physicochemical characteristics of ambient particles settling upon leaf surfaces of urban plants in Beijing

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第5期18卷 921-926页

作者： WANG Lei LIU Lian-you GAO shang-yu HASI Eerdun WANG Zhi College of Resources Science and Technology Beijing Normal University Beijing 100875 China The College of Resoures Environment and Tourism Capital Normal University Beijing 100037 China

Particulate pollution is a serious health problem throughout the world, exacerbating a wide range of respiratory and vascular illnesses in urban areas. Urban plants play an important role in reducing particulate pollution. Physicochemical characteristics of ambient particles settling upon leaf surfaces of eleven roadside plants at four sites of Beijing were studies. Results showed that density of particles on the leaf surfaces greatly varied with plant species and traffic condition. Fraxinus chiuensis, Sophora japonica Ailanthus altissima, Syringa oblata and Prunus persica, had larger densities of particles among the tall species. Due to resuspension of road dust, the densities of particles of Euonymus japonicns and Parthenocissus quinquefolia with low sampling height were 2-35 times to other taller tree species. For test plant species, micro-roughness of leaf surfaces and density of particles showed a close correlation. In general, the larger micro-roughness of leaf surfaces is, the larger density of particles is. Particles settling upon leaf surfaces were dominantly PM30 （particulate matter less than 10 μm in aerodynamic diameter; 98.4%） and PM2.5 （particulate matter less than 2.5 μm in aerodynamic diameter; 64.2%） which were closely relative to human health. Constant elements of particles were C, O, K, Ca, Si, Al, Mg, Na, Fe, S, Cl and minerals with higher content were SiO2, CaCO3, CaMg（CO3）2, NaCI and 2CASO4. H2O, SiO2. CaCO3 and CaMg（CO3）2 mainly came from resuspension of road dust. 2CaSO4. H2O was produced by the reaction between CaCO3 derived from earth dust or industrial emission and SO2, H2SO4 or sulfate. NaCl was derived from sea salt.

关键词： density of particles particle size distribution element composition micro-configuration of leaf epidermis mineral composition particles urban plants