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Antenna Decoupling Based on Characteristic Modes Cancellation

Chinese Journal of Electronics 2022年第6期31卷 1138-1145页

作者： CHU Qingxin zeng wenfeng School of Electronic and Information Engineering South China University of Technology

The demand for a high transmission data rate in 5G leads to the wide application of the multi-input, multi-output(MIMO) technique. However, the narrow design space in mobile phone causes severe unexpected coupling between antenna units and deteriorate the system performance dramatically. In this paper, we focus on the antenna coupling within the MIMO system. Some decoupling techniques are summarized, such as neutralization line, decoupling network, common/differential mode cancellation, etc. Finally, new decoupling research developments of modal currents cancellation based on the theory of characteristic mode are elaborated. Two design examples are shown to validate the benefit of the proposed decoupling method. The-6 dB impedance bandwidth of the head-to-head antenna pair can cover 3.4–3.6 *** isolation level is improved from more than 3.7 dB to more than 13 dB. The tail-to-tail antenna pair can cover 3.3–5 GHz and the isolation level is improved from more than 5 dB to more than 10 dB in the whole operating bandwidth. Both antenna pairs can achieve an envelop correlation coefficient of less than 0.2 and the antenna efficiencies are more than 40%.

关键词： neutralization line severe unexpected coupling mobile phone antenna pairs 3.3-5 GHz antenna units antenna radiation patterns narrow design space high transmission data rate mobile handsets multiinput MIMO system multioutput technique 5G mobile communication characteristic mode decoupling method 6 dB impedance bandwidth antenna efficiencies antenna coupling MIMO communication system performance antenna decoupling modal currents cancellation characteristic modes cancellation isolation level tail-to-tail antenna pair head-to-head antenna pair decoupling research developments decoupling techniques

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Chrysin promotes osteogenic differentiation via ERK/MAPK activation

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Protein & Cell 2013年第7期4卷 539-547页

作者： wenfeng zeng Yan Yan Fayun Zhang Chunling Zhang Wei Liang Protein&Peptide Pharmaceutical Laboratory Institute of BiophysicsChinese Academy of SciencesBeijing 100101China University of the Chinese Academy of Sciences Beijing 100049China Department of Endodontics Beijing Stomatological HospitalCapital Medical UniversityBeijing 100050China

T he effect of the anti-infl ammatory fl avonoid chrysin on osteogenesis was determined in preosteoblast MC3T3-E1 *** demonstrated that chrysin could induce osteogenic differentiation in the absence of other osteo-genic *** treatment promoted the expres-sion of transcription factors(Runx2 and Osx)and bone formation marker genes(Col1A1,OCN,and OPN)as well as enhanced the formation of mineralized *** osteogenic differentiation,chrysin preferentially activated ERK1/2,but not JNK nor the p38 *** experi-ments with inhibitors revealed the co-treatment of U0126,PD98059,or ICI182780(a general ER antagonist)with chrysin effectively abrogated the chrysin-induced osteo-genesis and ERK1/2 ***,the effect of chrysin on osteogenesis is ERK1/2-dependent and involves ***,chrysin has the signifi cant potential to enhance osteogenesis for osteoporosis prevention and treatment.

关键词： chrysin osteogenesis ERK1/2 estrogen re-ceptor

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Multifunctional biodegradable nanoplatform based on oxaliplatin prodrug cross-linked mesoporous polydopamine for enhancing cancer synergetic therapy

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Chinese Chemical Letters 2024年第1期35卷 379-384页

作者： Ping Sun Zimu Li Dan Zhang wenfeng zeng Yi Zheng Lin Mei Hongzhong Chen Nansha Gao Xiaowei zeng School of Pharmaceutical Sciences(Shenzhen) Sun Yat-sen UniversityShenzhen 518107China Central Laboratory University of Chinese Academy of Sciences-Shenzhen HospitalShenzhen 518106China Tianjin Key Laboratory of Biomedical Materials Key Laboratory of Biomaterials and Nanotechnology for Cancer ImmunotherapyInstitute of Biomedical EngineeringChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjin 300192China

Due to the limitations of conventional chemotherapy including side effects,poor prognosis,and drug resistance,there is an urgent need for the development of a novel multi-functional combined therapy ***-modified oxaliplatin prodrug(OXA-DA)was successfully synthesized in this study to ameliorate the organ distribution of oxaliplatin for improving the drug efficacy and reducing toxic side effects,and OXA-DA was applied to develop a porous oxaliplatin cross-linked polydopamine nanoparticle for loading siPD-L1 to construct multifunctional *** multifunctional nanoplatform was modified with poly(2-ethyl-2-oxazoline)(PEOz),which occurred charge reversal in the tumor microenvironment,and exerted the lysosomal escape effect in tumor cells to improve the bioavailability of small interfering RNA targeting programmed cell death-ligand 1(siPD-L1).The pH-responsive charge reversal,photothermal,biodegradation,lysosomal escape ability,PD-L1 protein degradation,toxicity properties and multiple antitumor effects were comprehensively evaluated in vitro and in vivo *** findings indicated that OXA-DA-siPD-L1@PDA-PEOz excellently induced tumor cell necrosis and apoptosis as a result of the synergistic effect of chemo-photothermal therapy,and upregulated CD8+T cells produced interferon-γ(IFN-γ)to further attack the tumor *** conclusion,the novel nanoplatform-mediated chemo/photothermal/immunotherapy has promising clinical applications in the treatment of malignant tumors.

关键词： Oxaliplatin prodrug Mesoporous polydopamine Charge reversal Synergetic therapy Cancer nanotechnology

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Vitamin C induces periodontal ligament progenitor cell differentiation via activation of ERK pathway mediated by PELP1

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Protein & Cell 2013年第8期4卷 620-627页

作者： Yan Yan wenfeng zeng Shujun Song Fayun Zhang Wenxi He Wei Liang Zhongying Niu Department of Endodontics School of StomatologyFourth Military Medical UniversityXi’an710032China Protein and Peptide Pharmaceutical Laboratory Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Treatment Center of Oral Diseases the 306th Hospital of People’s Liberation ArmyBeijing 100101China Department of Pathology and Experimental Medicine the 306th Hospital of People’s Liberation ArmyBeijing 100101China

The differentiation of periodontal ligament(PDL)progenitor cells is important for maintaining the homeostasis of PDL tissue and alveolar *** C(VC),a water-soluble nutrient that cannot be biosynthesized by humans,is vital for mesenchymal stem cells differentiation and plays an important role in bone ***,the objective of this study was to determine the function and mechanism of VC in PDL progenitor cells osteogenic differentiation at the molecular *** demonstrated that VC could induce the osteogenic differentiation and maturation of PDL progenitor cell without other osteogenic *** the process,VC preferentially activated ERK1/2 but did not affect JNK or ***-treatment with ERK inhibitor effectively decreased the Vitamin C-induced expression of *** inhibitor also abrogated Vitamin C-induced the minimized nodules ***1,a nuclear receptor co-regulator,was up-regulated under VC ***1 knockdown inhibited ERK *** overexpression of PELP1 had a positive relationship with Runx2 *** together,we could make a conclude that VC induces the osteogenic differentiation of PDL progenitor cells via PELP1-ERK *** fi nding implies that VC may have a potential in the regeneration medicine and application to periodontitis treatment.

关键词： periodontal ligament progenitor cells Vitamin C PELP1 ERK signaling pathway osteogenic differentiation

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Spatial Analysis of the Return location of Migrant Workers--Case Study on 12 Villages in Henan Province,China

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Journal of Earth Science and Engineering 2018年第3期8卷 122-131页

作者： Gao Genghe zeng wenfeng Luo Qing Fan Xinsheng School of Resources and Environment Henan University of Economics and LawZhengzhou 450046China Collaborative Innovation Center of Urban-Rural Coordinated Development Henan ProvinceZhengzhou 450046China

In the process of rapid industrialization and urbanization,the phenomenon of migrant workers’return accompanied its flow is attracting more and more attention of *** on the sampling data of 529 migrant workers’return questionnaires,statistical analysis and binary logistic model were used to analyze the return location choice and influencing factors of migrant *** study found that the village,the local township and the local county seat are the main choices for the inter-provincial migrant workers of return *** local township and the local county seat are also the preferred locations for migrant workers to return to business,while in the city and other city are less migrant *** main mechanism for the choice of migrant workers of return location is the balance between the family and the economic *** main factors affecting the choice of rural migrant workers’return location are the age of migrant workers,the number of primary and secondary school students,the number of migrant workers,and the per capita cultivated *** mobility and return of migrant workers are actually the location choices and changes of migrant workers in geospatial space,which depends on the sticky size of different locations.

关键词： Return location spatial analysis migrant workers circulation migration

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中国中部农区农民工多阶流动及影响因素研究——以河南省6个村为例

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地理科学 2019年第3期39卷 459-466页

作者：曾文凤高更和河南财经政法大学资源与环境学院河南郑州450046 城乡协调发展河南省协同创新中心河南郑州450046

基于田野调查深度访谈数据,采用统计分析和逐次二元Logistic方法,对农民工空间流动随时间变化的规律进行研究,提出并验证农民工多阶流动假说。研究认为,农民工对务工地的选择是一个趋于优化的动态过程,随着流动次数的增加,务工地逐渐趋... 详细信息

基于田野调查深度访谈数据,采用统计分析和逐次二元Logistic方法,对农民工空间流动随时间变化的规律进行研究,提出并验证农民工多阶流动假说。研究认为,农民工对务工地的选择是一个趋于优化的动态过程,随着流动次数的增加,务工地逐渐趋于稳定,区位务工时间延长,村落附近的城镇渐成主要务工地选项,流动动因中的主观动因强化,被动动因弱化,逐次流动模型中务工年限、务工地域类型、务工者年龄、家庭人口规模、家庭耕地面积、村地形、村务工人数比例、村区位等主要因子的显著性程度和方向也发生相应变化。经过多次流动,务工地愈加符合务工者预期。

关键词：多阶流动农民工时间过程务工地

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纺织品一体化对孟加拉成衣业的影响

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国际经济合作 2006年第1期 46-48页

作者：曾文峰于丹驻孟加拉国大使馆经商处

根据世界贸易组织《纺织品与服装协定》（ATC）的规定，多种纤维协议（MFA）于2005年1月1日宣告终止，从此世界纺织品贸易实现一体化，长达几十年的纺织品贸易扭曲体制有望消除，这是乌拉丰回合谈判的重要成果，也是现行多边贸易体制赖... 详细信息

根据世界贸易组织《纺织品与服装协定》（ATC）的规定，多种纤维协议（MFA）于2005年1月1日宣告终止，从此世界纺织品贸易实现一体化，长达几十年的纺织品贸易扭曲体制有望消除，这是乌拉丰回合谈判的重要成果，也是现行多边贸易体制赖以存在的重要基础。但是，少数西方舆论认为，中围将在“后MFA时代”挤占大量纺织服装市场，甚至鼓吹这将以广大发展中国家丧失市场为代价。

关键词：《纺织品与服装协定》一体化成衣业孟加拉世界贸易组织多边贸易体制纺织服装市场纺织品贸易发展中国家西方舆论

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毛泽东人民价值观论纲

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中国延安干部学院学报 2019年第6期12卷 69-80页

作者：杨振闻曾文峰哲学教研部湖南长沙410006

毛泽东一生都在致力于实现国家独立、民族解放、人民幸福,形成了以"人民"为轴心的价值理论体系。毛泽东人民价值观是毛泽东领导中国革命和建设的丰富实践在价值观上的集中表达。毛泽东人民价值观有三大理论来源:中国传统民本价值观、西... 详细信息

毛泽东一生都在致力于实现国家独立、民族解放、人民幸福,形成了以"人民"为轴心的价值理论体系。毛泽东人民价值观是毛泽东领导中国革命和建设的丰富实践在价值观上的集中表达。毛泽东人民价值观有三大理论来源:中国传统民本价值观、西方人本价值理论和马克思主义价值观理论。毛泽东人民价值观的历史演进大致可以分为三个时期:"五四运动"前:再造中国,幸福人民;新民主主义革命时期:民族独立,人民解放;社会主义革命与建设时期:国家富强,人民幸福。毛泽东人民价值观主要内容包括,价值取向:为人民服务;价值主体:最广大人民;价值初心:人民幸福;价值标准:人民利益至上;价值方法:"两个改造"。随着中国特色社会主义实践的不断发展,毛泽东人民价值观在多个领域都有了许多创新性发展。

关键词：毛泽东人民价值观为人民服务

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骨劈开术在水平骨量不足缺牙区种植中的临床应用进展

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广州医药 2023年第1期54卷 99-105页

作者：曾文锋广州医科大学附属第五医院口腔科广州510000

缺牙区水平骨量不足一直是口腔种植的重要难题。骨劈开术是常用于解决此难题的手术方式之一,目前临床常用术式是采用超声骨刀沿牙槽嵴顶矢状劈开后,用骨凿将唇(颊)侧骨板向唇(颊)侧移位后增加牙槽骨水平宽度,达到同期种植的目的。骨劈... 详细信息

缺牙区水平骨量不足一直是口腔种植的重要难题。骨劈开术是常用于解决此难题的手术方式之一,目前临床常用术式是采用超声骨刀沿牙槽嵴顶矢状劈开后,用骨凿将唇(颊)侧骨板向唇(颊)侧移位后增加牙槽骨水平宽度,达到同期种植的目的。骨劈开并同期植入种植体降低了困难病例的手术难度和风险,减少了患者就诊次数,降低患者成本。但若劈开后种植体周围的间隙大于1 mm或唇侧骨板分离,则需要同期进行植骨。但骨劈开术的使用也具有一定的适应症,要求缺牙区垂直骨高度足够,水平骨宽度不足(3~5 mm),骨质为Ⅲ~Ⅳ类骨,患者无种植手术的局部和全身禁忌证。近年来的研究表明骨劈开术具有创伤小、手术安全有效、不用开辟第二创口即可获得较好的骨增量效果等优点,一定程度上扩大了种植手术适应证。现本文对骨劈开术的翻瓣术式、非翻瓣术式及术后效果的进展进行综述。

关键词：骨量不足骨增量技术骨劈开技术

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海洋链霉菌Streptomyces sp. SCSIO1667产星形孢菌素的初步研究

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中国酿造 2011年第5期30卷 70-74页

作者：曾文峰王菊芳华南理工大学生物科学与工程学院广东广州510006

星形孢菌素(Staurosporine,STS)是蛋白激酶C抑制剂,具有很强的抗肿瘤活性。该研究对来自中国南海的链霉菌Strep-tomyces ***1667发酵产物星形孢菌素进行发酵工艺优化。结果表明,30℃、60h是星形孢菌素最佳收获温度和时间;木薯淀粉和酵... 详细信息

星形孢菌素(Staurosporine,STS)是蛋白激酶C抑制剂,具有很强的抗肿瘤活性。该研究对来自中国南海的链霉菌Strep-tomyces ***1667发酵产物星形孢菌素进行发酵工艺优化。结果表明,30℃、60h是星形孢菌素最佳收获温度和时间;木薯淀粉和酵母粉是最适碳、氮源;木薯淀粉和海盐是培养基成分的重要影响因子。利用爬坡路径试验和响应面分析法进行优化显示当培养基中木薯淀粉和海盐含量分别为48.64g/L和1.13g/L时STS最大理论值为(50.53±0.52)μg/mL,摇瓶实测值为(50.89±0.24)μg/mL,其发酵水平比优化前提高了2.76倍。

关键词：星形孢菌素发酵优化部分因子实验响应面试验

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