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Dark Soliton of Polariton Condensates under Nonresonant PT-Symmetric Pumping

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Chinese Physics Letters 2020年第4期37卷 14-18页

作者： Chun-Yu Jia zhao-xin liang Department of Physics Zhejiang Normal UniversityJinhua 321004

A quantum system in complex potentials obeying parity-time(PT) symmetry could exhibit all real spectra,starting out in non-Hermitian quantum mechanics. The key physics behind a PT-symmetric system consists of the balanced gain and loss of the complex potential. We plan to include the nonequilibrium nature(i.e., the intrinsic kinds of gain and loss of a system) to a PT-symmetric many-body quantum system, with an emphasis on the combined effects of non-Hermitian due to nonequilibrium nature and PT symmetry in determining the properties of a system. To this end, we investigate the static and dynamical properties of a dark soliton of a polariton Bose–Einstein condensate under the PT-symmetric non-resonant pumping by solving the drivendissipative Gross–Pitaevskii equation both analytically and numerically. We derive the equation of motion for the center of mass of the dark soliton’s center analytically with the help of the Hamiltonian approach. The resulting equation captures how the combination of the open-dissipative character and PT-symmetry affects the properties of the dark soliton;i.e., the soliton relaxes by blending with the background at a finite time. Further numerical solutions are in excellent agreement with the analytical results.

关键词： soliton symmetry quantum

Collective Excitations of a Dipolar Bose-Einstein Condensate in anAnharmonic Trap

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Chinese Physics Letters 2013年第6期30卷 17-20页

作者： QI Wei liang zhao-xin ZHANG Zhi-Dong Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016

The collective excitations of a one-dimensional dipolar Bose–Einstein condensate trapped in an anharmonic potential are investigated *** the variational approach,we obtain the coupled equations of motion for the center-of-mass coordinate of the condensate and its *** particular,analytical expressions for the low-lying excitation modes are *** results show that dipole-dipole interactions reduce the frequency shift induced by quartic *** interplay between dipole-dipole interactions and anharmonic distortion for the collapse and revival of the collective excitations originating from the nonlinear coupling between the two modes are also discussed.

关键词： harmonic dipole excitation

Modulational Instability of Dipolar Bose-Einstein Condensates in Optical Lattices with Three-Body Interactions

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Chinese Physics Letters 2018年第1期35卷 6-9页

作者： Wei Qi Zi-Hao Li zhao-xin liang Department of Applied Physics School of Arts and SciencesShaanxi University of Science and TechnologyXi'an 710021 Department of Physics Zhejiang Normal UniversityJinhua 321004

Motivated by the recent experiment[Nature 530(2016)194]in which a stable droplet in a dipolar quantum gas has been created by the interaction-induced instability,we focus on the modulation instability of an optically-trapped dipolar Bose-Einstein condensate with three-body *** the mean-field level,we analytically solve the discrete cubic-quintic Gross-Pitaevskii equation with dipole-dipole interaction loaded into a deep optical lattice and show how combined effects of the three-body interaction and dipole-dipole interaction on the condition of modulational *** results show that the interplay of the three-body interaction and dipole-dipole interaction can dramatically change the modulation instability condition compared with the ordinary Gross-Pitaevskii *** believe that the predicted results in this work can be useful for the future possible experiment of loading a Bose-Einstein condensate of^(164)Dy atoms with strong magnetic dipole-dipole interaction into an optical lattice.

关键词： Optical lattices

Variational Approach to Study PT-Symmetric Solitons in a Bose–Einstein Condensate with Non-locality of Interactions

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Chinese Physics Letters 2019年第4期36卷 10-14页

作者： Wei Qi Hai-Feng Li zhao-xin liang Department of Applied Physics School of Arts and Sciences Shaanxi University of Science and Technology School of Science Xi'an Technological University Department of Physics Zhejiang Normal University

Considering the non-locality of interactions in a Bose–Einstein condensate, the existence and stability of solitons subject to a PT-symmetric potential are discussed. In the framework of the variational approach, we investigate how the non-locality of interactions affects the self-localization and stability of a condensate with attractive two-body interactions. The results reveal that the non-locality of interactions dramatically influences the shape,width, and chemical potential of the condensate. Analytically variational computation also predicts that there exists a critical negative non-local interaction strength(p_c 0), there always exist stable bright solitons in some appropriate parameter regimes.

关键词： interactions stability influences

Arachnoid cell involvement in the mechanism of coagulation-initiated inflammation in the subarachnoid space after subarachnoid hemorrhage

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第7期11卷 516-523页

作者： zhao-liang xin Xiao-kang WU Jian-rong XU Xi LI Department of Neurosurgery Zhejiang Medical College Hangzhou 310053 China Department of Neurosurgery Shanghai Tenth People's Hospital Shanghai 200072 China Department of Neurosurgery Yiwu Central Hospital Yiwu 322000 China

Objective： To assess if arachnoid cells have the capability to present antigen and activate T-lymphocytes after stimulation by bloody cerebrospinal fluid （CSF）, and to illuminate the mechanism of coagulation-initiated inflammation in the subarachnoid space after subarachnoid hemorrhage （SAH）. Methods： Arachnoid cells were cultured, characterized, and examined by immunofluorescence for the basal expression of human leukocyte antigen-DR （HLA-DR）, Expression of HLA-DR, after co-culturing arachnoid cells in vitro with bloody CSF, was investigated by immunofluorescence and flow cytometry （FCM）. The variation of arachnoid cells＇ ultrastructure was observed by transmission electron microscope （TEM）. Arachnoid cells were co-cultured with peripheral blood mononuclear cells （PBMCs）. The content of soluble interleukin-2 receptor （slL-2r） in culture medium was detected by enzyme-linked immunosorbent assay （ELISA）. Results：（1） Arachnoid cells were successfully cultured for many passages. The immunofluorescent staining was positive for HLA-DR in over 95% of the human arachnoid cells. The punctate HI_A-DR was distributed in cytoplasm and not in the karyon. （2） After co-culturing arachnoid cells in vitro with bloody CSF, numerous particles with strong fluorescence appeared in the cytoplasm on Day 6. On Day 8, the quantity of particles and fluorescent intensity were maximal. FCM showed that the percentage of HLA-DR expressing cells was （2.5＋_0.4）% at the first 5 d, increasing to （60.8＋_3.6）% on Day 7. （3） After co-culturing arachnoid cells in vitro with bloody CSF, many lysosome and secondary lysosome particles were present in the cytoplasm. Hyperplasia of rough endoplasmic re- ticulum and enlarged cysts were observed, with numerous phagocytizing vesicles also observed at the edge of the arachnoid cells. （4） Arachnoid cells stimulated by bloody CSF were co-cultured in vitro with PBMCs. The content of slL-2r in the culture medium, having been maintained at around 1.30 ng/ml during t

关键词： Arachnoid cells Cell culture Human leukocyte antigen-DR (HLA-DR) Soluble intedeukin-2 receptor (slL-2r)

Screening and Analysis of Proteins Interacting with TaPDK from Physiological Male Sterility Induced by CHA in Wheat

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Journal of Integrative Agriculture 2013年第6期12卷 941-950页

作者： ZHANG Long-yu ZHANG Gai-sheng zhao xin-liang YANG Shu-ling College of Agronomy Northwest A&F University/Wheat Breeding Engineering Research Center Ministry of Education/Key Laboratory of Crop Heterosis of Shaanxi Province

To further research the regulatory network of pyruvate dehydrogenase kinase （designated as TaPDK） in physiological male-sterility （PHYMS） of wheat induced by chemical hybridizing agent （CHA） SQ-1, an anther cDNA library was constructed, and the proteins interacting with TaPDK were screened via yeast two-hybrid technique. Subsequently, a few candidate proteins in nucleotide expression levels were detected by real-time quantitative PCR. Yeast-two hybrid screening was performed by mating yeast strain Y2HGold containing BD-TaPDK bait plasmid with yeast strain Y187 including anther cDNA library plasmid. Diploid yeast cells were plated on synthetic dropout nutrient medium （SD/-Ade/-His/-Leu/-Trp）（QDO）, and further were incubated on QDO medium containing AbA and X-α-Gal. The interactions between TaPDK and the proteins obtained from positive colonies were further confirmed by co-transformation validation. After plasmids DNA were extracted from blue colonies and sequenced, the sequences results were analyzed by bioinformatic methods. Finally, 24 colonies were obtained, including eight genes, namely non-specific lipid-transfer protein precursor （TanLTP）, polyubiquitin （TaPUbi）, glyceraldehyde-3-phosphate dehydrogenase, proliferating cell nuclear antigen （TaPCNA）, CBS domain containing protein （TaCBS）, actin, guanine nucleotide-binding protein beta subunit, chalcone synthase, and three new genes with unknown function. The results of quantitative RT-PCR showed that the expression levels of TanLTP, TaPUbi, and TaPCNA were obviously up-regulated in PHYMS anther, and TaCBS expression was only increased at the tricellular stage in PHYMS anther compared with in fertile lines. Whereas, the expression of TaPDK was obviously down-regulated in PHYMS lines. Collectively, these datas indicated that the majority of candidate proteins might be related to pollen abortion in PHYMS lines, which further suggested that TaPDK plays multiple roles in pollen development, besides participating in r

关键词： wheat (Triticum aestivum L.) chemical hybridizing agent pyruvate dehydrogenase kinase yeast two-hybrid pollen abortion

基于产业技术特征的企业创新策略分析框架——以辽宁装备制造业为例

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东北大学学报（自然科学版） 2009年第6期30卷 897-900页

作者：赵建华赵新良东北大学工商管理学院辽宁沈阳110004

将产业发展的技术环境分为外部环境和内部环境,其中外部环境主要包括产业技术变化率和技术能力异质性;内部环境主要指产业技术能力.在对产业技术变化率、技术能力异质性和技术能力分别进行阐述的基础上,构建以这三个因素为基本维度的产... 详细信息

将产业发展的技术环境分为外部环境和内部环境,其中外部环境主要包括产业技术变化率和技术能力异质性;内部环境主要指产业技术能力.在对产业技术变化率、技术能力异质性和技术能力分别进行阐述的基础上,构建以这三个因素为基本维度的产业技术特征评价方法.运用该方法评价产业技术特征并根据产业技术特征进行产业聚类,给出基于产业技术特征的企业技术创新策略分析框架,为企业进行技术预见、技术环境分析、技术创新策略选择等提供理论依据和分析方法.对辽宁省装备制造业12个产业进行应用实例分析.

关键词：技术特征变化率技术能力异质性创新策略

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激子极化激元凝聚体中的二维亮孤子

物理学报 2023年第10期72卷 174-182页

作者：黄轶凡梁兆新浙江师范大学物理系金华321004

在非保守非线性系统中,产生孤子的基本物理机理是系统的动能与非线性、以及增益与耗散达到双动力学平衡.如何在该系统中产生稳定的自由高维孤子是目前孤子理论具有挑战性的前沿课题.本文提出了一种在激子极化激元玻色-爱因斯坦凝聚体中... 详细信息

在非保守非线性系统中,产生孤子的基本物理机理是系统的动能与非线性、以及增益与耗散达到双动力学平衡.如何在该系统中产生稳定的自由高维孤子是目前孤子理论具有挑战性的前沿课题.本文提出了一种在激子极化激元玻色-爱因斯坦凝聚体中实现二维自由亮孤子理论方案,即通过时间周期调制相互作用以及增益与耗散双平衡的物理机理产生稳定的二维自由空间亮孤子.为此,首先通过拉格朗日量变分法得到了二维亮孤子参数的动力学方程,得到其动力学稳定的参数空间.其次,数值模拟广义增益耗散Gross-Pitaveskii方程的含时演化,验证了二维亮孤子的稳定性.最后,加入高斯噪声模拟真实实验环境,发现在实验可观测的时间范围内,二维亮孤子是稳定的.本文的实验方案打开了在非保守系统中研究高维自由空间亮孤子的大门.

关键词：亮孤子激子极化激元凝聚体 Gross-Pitaevskii方程

Intracerebral xenotransplantation of semipermeable membrane- encapsuled pancreatic islets

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World Journal of Gastroenterology 2005年第36期11卷 5714-5717页

作者： zhao-liang xin Song-Lin Ge Xiao-Kang Wu Yan-Jie Jia Han-Tao Hu Neurosurgery Department of Yiwu Central Hospital 3rd Faculty of Medical College Zhejiang University Yiwu 322000 Zhejiang Province China 3rd Faculty of Medical College Zhejiang University Hangzhou 310016 Zhejiang Province China Department of Neurosurgery Affiliated Hospital of Railway University Shanghai China Department of Anatomy Medical College Xi'an Jiaotong University Xi'an 710007 Shaanxi Province China

AIM： To identify the decreasing effect of xenotransplantion in combination with privileged sites on rejection and death of biological semipermeable membrane-（BSM） encapsulated implanted islets. METHODS： After the BSM experiment in vitro, BSM- encapsulated SD rat＇s islet-like cell clusters （ICCs） were xenotransplanted into normal dog＇s brain. Morphological changes were observed under light and transmission electron microscope. The islets and apoptosis of implanted B cells were identified by insulin-TONEL double staining. RESULTS： The BSM used in our study had a favorable permeability, some degree of rigidity, lighter foreign body reaction and toxicity. The grafts consisted of epithelioid cells and loose connective tissue. Severe infiltration of inflammatory cells was not observed. The implanted ICCs were identified 2 mo later and showed typical apoptosis. CONCLUSION： BSM xenotransplantation in combination with the privileged site can inhibit the rejection of implanted heterogeneous ICCs, and death of implanted heterogeneous B cells is associated with apoptosis. 2005 The WJG Press and Elsevier Inc. All rights reserved.

关键词： Islets of Langerhans Xenotransplantation Brain Semipermeable membrane