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| 1 | Microstructure of fibrils separated from polyacrylonitrile fibers by ultrasonic etching显示文摘Polyacrylonitrile (PAN) fiber is an important precursor fiber for high performance carbon fiber.The properties of the final carbon fiber depend strongly on the nature of the PAN fibers.The PAN fibrils were separated successfully from fibers by ultrasonic etching and were systematically investigated by field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM).It is found that in certain ultrasonic etching conditions (at 75±2oC for 6 h with a frequency of 40 kHz) the PAN fibers are dissolved in the 95 wt.% aqueous dimethylsulphoxide (DMSO) solution;the fibrils consisting of numerous periodic lamellae with thickness of 30-45 nm and perpendicular to the fiber axis are separated in the 90 wt.% aqueous DMSO solution;and the fibrils with smooth surface exfoliated from the PAN fibers are obtained in the 70-90 wt.% aqueous DMSO solutions.Inner periodical structure of fibrils was observed in HRTEM,which indicates that there are different densities and two phases in fibrils.The PAN fibers are dissolved layer by layer with increasing ultrasonic etching time.The fiber surface experiences ultrasonic cleaning,selective etching,excessive etching and dissolution,and then the sublayer experiences the same process.There are numerous periodic lamellae in fibrils of nascent fibers.This means that the fibrils with lamellae are formed by orientation and crystallization in shearing field of spinning pipe and drawing stress field of coagulation bath. | WANG QiFen,WANG ChengGuo,YU MeiJie,MA Jie,HU XiuYing & ZHU Bo Carbon Fiber Engineering Research Center,Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education),Shandong University,Jinan 250061,China | 2010 | Science China(Technological Sciences)2010，53，6： | 3 |
| 2 | Derivations and Automorphism Group of Original Deformative Schrodinger-Virasoro Algebra显示文摘 | Qifen Jiang Song Wang | 2015 | Algebra Colloquium2015，22，3： | 2 |
| 3 | Adsorptionof trichloroethylene and benzene vapors onto hyper-crosslinked polymeric resin显示文摘 | LIU Peng LONG Chao LI Qifen | 2009 | Journal of HazardousMaterials2009，166，1： | 1 |
| 4 | Adsorption of trichloroethylene and benzene vapors onto hypercrosslinked polymeric resin显示文摘 | Peng Liu Chao Long Qifen Li Hongming Qian Aimin Li Quanxing Zhang | 2008 | Journal of Hazardous Materials2008，，1： | 1 |
| 5 | Improved cellularization and angiogencsis using collagen scaffolds chemically conjugated with vascular endothelial growth factor显示文摘 | He Qifen Zhao Yannan Chen Bing | 2011 | Acta Biomaterialia2011，7，3： | 1 |
| 6 | Removal of organic matter and ammonia nitro- gen from landfill leachate by ultrasound 显示文摘 | Songlin Wang Xiaohui Wu Yansong Wang Qifen Li Meijun Tao | 2008 | Ultrasonics Sonochemistry2008，15，： | 1 |
| 7 | Microsurgical skills training:a new concept for simulation of vessel-wall suturing显示文摘 | Lahiri A Lim AY Qifen Z | 2005 | Microsur-gery2005，25，1： | 1 |
| 8 | Adsorption of trichloroethylene and benzene vapors onto hypercrosslinked polymeric resin显示文摘 | Liu Peng Long Chao Li Qifen | 2009 | Journal of Hazardous Materials2009，166，1： | 1 |
| 9 | Fibrils separated from polyacrylonitrile fiber by ultrasonic etch- ing in dimethylsulphoxide solution显示文摘 | Wang Qifen Wang Chengguo Bai Yujun | 2010 | Journal of Poly- mer Science Part: B2010，48，5： | 1 |
| 10 | Study on Influencing Factors of Methane Production Efficiency of Microbial Electrolytic Cell with CO_(2) as Carbon Source显示文摘Reducing CO_(2) to produce methane through microbial electrolytic cell(MEC)is one of the important methods of CO_(2) resource utilization.In view of the problem of low methanogenesis rate and weak CO_(2) conversion rate in the reduction process,theflowfield environment of the cathode chamber is changed by changing the upper gas cir-culation rate and the lower liquid circulation rate of the cathode chamber to explore the impact on the reactor startup and operation and products.The results showed that under certain conditions,the CO_(2) consumption and methane production rate could be increased by changing the upper gas recirculation rate alone,but the increase effect was not obvious,but the by-product hydrogen production decreased significantly.Changing the lower liquid circulation rate alone can effectively promote the growth of biofilm,and change the properties of biofilm at the later stage of the experiment,with the peak current density increased by 16%;The methanogenic rate decreased from the peak value of 0.561 to 0.3 mmol/d,and the CO_(2) consumption did not change signifi-cantly,which indicated that CO_(2) was converted into other organic substances instead of methane.The data after coupling the upper gas circulation rate with the lower liquid circulation rate is similar to that of only changing the lower liquid circulation rate,but changing the upper gas circulation rate can alleviate the decline of methane pro-duction rate caused by the change of biofilm properties,which not only improves the current density,but also increases the methane production rate by 0.05 mmol/d in the stable period.This study can provide theoretical and technical support for the industrial application scenario offlowfield regulation intervention of microbial elec-trolytic cell methanogenesis. | Qifen Li Yuanbo Hou Yongwen Yang Liting Zhang Xiaoxiao Yan | 2023 | Journal of Renewable Materials2023，11，8： | 0 |
| 11 | Optimisation Strategy of Carbon Dioxide Methanation Technology Based on Microbial Electrolysis Cells显示文摘Microbial Electrolytic Cell(MEC)is an electrochemical reaction device that uses electrical energy as an energy input and microorganisms as catalysts to produce fuels and chemicals.The regenerative electrochemical system is a MEC improvement system for methane gas produced by biological carbon sequestration technology using renewable energy sources to provide a voltage environment.In response to the influence of fluctuating disturbances of renewable electricity and the long system start-up time,this paper analyzes the characteristics of two strategies,regulating voltage parameter changes and activated sludge pretreatment,on the methane production efficiency of the renewable gas electrochemical system.In this system,the methane production rate of regenerative electrochemical system is increased by 1.4 times through intermittent boosting start-up strategy;based on intermittent boosting,the methane production rate of regenerative electrochemical system is increased by 2 times through sludge pyrolysis pretreatment start-up strategy,and the start-up time is reduced to 10 days.Meanwhile,according to the simulation test results of power input fluctuation and intermittency,the stability standard deviation of its system operation is 75%of the original one,and the recovery rate is about 1 times higher.This study can provide a theoretical basis and technical reference for the early industrial application of microbial CO_(2)methanation technology based on renewable energy. | Qifen Li Xiaoxiao Yan Yongwen Yang Liting Zhang Yuanbo Hou | 2023 | Journal of Renewable Materials2023，11，7： | 0 |
| 12 | Bimodule and twisted representation of vertex operator algebras显示文摘In this paper, for a vertex operator algebra V with an automorphism g of order T, an admissible V-module M and a fixed nonnegative rational number n ∈1/T Z_+, we construct an A_(g,n)(V)-bimodule Ag,n(M) and study its properties, discuss the connections between bimodule A_(g,n)(M) and intertwining operators. Especially, bimodule A _(g,n)-1T(M) is a natural quotient of A_(g,n)(M) and there is a linear isomorphism between the space IM^k M Mjof intertwining operators and the space of homomorphisms HomA_(g,n)(V)(A_(g,n)(M) A_(g,n)(V)M^j(s), M^k(t)) for s, t ≤ n, M^j, M^k are g-twisted V modules, if V is g-rational. | JIANG QiFen JIAO XiangYu | 2016 | Science China Mathematics2016，59，2： | 0 |
| 13 | 巨噬细胞通过直接物理粘附和机械牵引来介导脑血管破裂的修复显示文摘出血性脑卒中和脑出血是由脑血管破裂引起的。快速修复这种破裂是最有希望的治疗方法。由于缺乏高分辨率的体内实时研究,脑血管修复过程中的动态细胞事件仍然未知。 | Chi Liu Chuan Wu Qifen Yang Jing Gao Li Li 杨德琴 罗凌飞 | 2017 | 科学新闻2017，19，4： | 0 |
| 14 | Study on Biological Pathway of Carbon Dioxide Methanation Based on Microbial Electrolysis Cell显示文摘Realization of CO_(2) resource utilization is the main development direction of CO_(2) reduction.The CO_(2) methana-tion technology based on microbial electrolysis cell(MEC)has the characteristics of ambient temperature and pressure,green and low-carbon,which meets the need of low-carbon energy transition.However,the lack of the system such as the change of applied voltage and the reactor amplification will affect the methane production efficiency.In this research,the efficiency of methane production with different applied voltages and different types of reactors was carried out.The results were concluded that the maximum methane production rate of the H-type two-chamber microbial electrolysis cells(MECs)at an applied voltage of 0.8 V was obtained to be 1.15 times higher than that of 0.5 V;under the same conditions of inoculated sludge,the reactor was amplified 2.5 times and the cumulative amount of methane production was 1.04 times higher than the original.This research can provide a theoretical basis and technical reference for the early industrial application of CO_(2) methanation tech-nology based on MEC. | Guanwen Ding Qifen Li Liting Zhang Yuanbo Hou Xiaoxiao Yan | 2023 | Journal of Renewable Materials2023，11，1： | 0 |
| 15 | Gastrointestinal stromal tumors显示文摘A case of gastrointestinal stromal tumors(GIST)in the Third Affiliated Hospital of Inner Mongolia Medical University was collected and analyzed on the basis of diagnosis,physical examination and treatment.Misdiagnosis of GIST is very common since it is a rare disease.So this paper aims to enhance the doctors’awareness of GIST during clinical practice. | Hong Cui Meili Gao Qifen Qu Ridong Shi | 2015 | Discussion of Clinical Cases2015，2，1： | 0 |
| 16 | 斑马鱼脑血管损伤促使淋巴管侵入脑实质区域并引导血管再生显示文摘文章简介在正常生理状态下,脊椎动物的脑实质中缺乏淋巴管,目前发现的淋巴管主要存在于硬脑膜中。但令人惊奇的是,课题组发现脑血管受损后,脑膜淋巴管会立即响应脑血管损伤并迅速侵入受损脑实质区域。这些进入受损脑区的淋巴管一方面排出急性脑损伤产生的大量组织液,避免因脑水肿而危及动物生命。 | Jingying Chen Jianbo He Rui Ni Qifen Yang Yaoguang Zhang 罗凌飞 | 2020 | 科学新闻2020，，2： | 0 |
| 17 | Strategy Research on Parent-Child Communication between Family Educations in Network Era显示文摘Internet technology is the greatest scientific and technological achievement of mankind in the 20th century.It has brought mankind into the information age and greatly changed people's way of learning,education,work,leisure and entertainment,family education and so on.In the Internet age,underage children spend a considerable amount of time online,and they spend less time talking and communicating with their parents?Therefore,the development of network technology has posed a new challenge not only to school education and social education,but also to the traditional family education[6].So,under the impact and challenge of the network era,what countermeasures do family education apply to communicate well with children?This is the center of this research. | Ke Huang Qifen Song | 2019 | Journal of Contemporary Educational Research2019，3，5： | 0 |
| 18 | Fast Distributed Demand Response Algorithm in Smart Grid显示文摘This paper proposes a fast distributed demand response(DR)algorithm for future smart grid based on primaldual interior method and Gaussian belief propagation(Ga BP)solver.At the beginning of each time slot,each end-user/energysupplier exchanges limited rounds of messages that are not private with its neighbors,and computes the amount of energy consumption/generation locally.The proposed demand response algorithm converges rapidly to a consumption/generation decision that yields the optimal social welfare when the demands of endusers are low.When the demands are high,each end-user/energysupplier estimates its energy consumption/generation quickly such that a sub-optimal social welfare is achieved and the power system is ensured to operate within its capacity constraints.The impact of distributed computation errors on the proposed algorithm is analyzed theoretically.The simulation results show a good performance of the proposed algorithm. | Qifen Dong Li Yu Wenzhan Song Junjie Yang Yuan Wu Jun Qi | 2017 | IEEE/CAA Journal of Automatica Sinica2017，4，2： | 0 |
| 19 | Effects of SPNE on Growth,Development and Correlated Traits of Five Drosophila melanogaster Strains显示文摘Five homozygous strains of Drosophila melanogaster were used as the experimental materials and treated with SPNE(Special Plant Nutritional Element).D. melanogaster larvae were incubated at 18 ℃ in Drosophila culture medium with SPNE addition. The results showed that larva emergence,pupa emergence and adult emergence in SPNE treatment were earlier than that in control. SPNE treatment accelerated the growth and development,shortened the life cycle,significantly increased the quantity of offspring and slightly improved the weight of D. melanogaster,which confirmed that SPNE posed significant effects on D. melanogaster.This study laid foundation for the breeding of D. melanogaster and other insects and provided new materials and a new approach for broadening the application of SPNE. | Bochun ZHOU Qifen DENG Suqin YU Shaoming CHANG Daolian FENG | 2014 | Agricultural Biotechnology2014，3，5： | 0 |
| 20 | GoldenFish:a rapid and efficient system to customize constructs for zebrafish transgenesis显示文摘Transgenesis, which inserts exogenous DNA into animal genomes, is a widely used technique. Traditionally, the constructs for transgenesis are generated by step-by-step subcloning of DNA fragments, which requires multiple steps depending on the construct complexity. To overcome the limitation, advanced tools such as Gateway cloning (Hartley et al., 2000;Kwan et al., 2007), In-Fusion cloning (Sleight et al., 2010), and Gibson assembly (Gibson et al., 2009) have been developed. However, due to their ligation characteristics, no systematic method for transgenesis has been developed. ‘Golden Gate’ cloning first appeared in 2008, which is a widely used DNA assembly method (Engler et al., 2008, 2009). Here, we take zebrafish transgenesis as an example and develop a standardized system called GoldenFish, which is based on Golden Gate cloning. It can customize transgenic constructs in one step and can be applied to multiple types of transgenesis such as one gene driven by one promoter, multiple genes driven by one promoter, and multiple genes respectively driven by multiple promoters, significantly reducing working time. | Zhanmei Jiang Lirong Huang Jieqiong Zhao Yanfeng Li Jianlong Ma Rui Ni Qifen Yang Lingfei Luo Yun Yang Jingying Chen | 2022 | Journal of Molecular Cell Biology2022，14，12： | 0 |
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