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| 1 | Monthly survey of N-nitrosamine yield in a conventional water treatment plant in North China显示文摘A sampling campaign was conducted monthly to investigate the occurrence of N-nitrosamines at a conventional water treatment plant in one city in North China.The yield of N-nitrosamines in the treated water indicated precursors changed greatly after the source water switching.Average concentrations of N-nitrosodimethylamine(NDMA),N-nitrosomorpholine(NMOR),and N-nitrosopyrrolidine(NPYR) in the finished water were6.9,3.3,and 3.1 ng/L,respectively,from June to October when the Luan River water was used as source water,while those of NDMA,N-nitrosomethylethylamine(NMEA),and NPYR in the finished water were 10.1,4.9,and 4.7 ng/L,respectively,from November to next April when the Yellow River was used.NDMA concentration in the finished water was frequently over the 10 ng/L,i.e.,the notification level of California,USA,which indicated a considerable threat to public health.Weak correlations were observed between N-nitrosamine yield and typical water quality parameters except for the dissolved organic nitrogen. | Chengkun Wang Shuming Liu Jun Wang Xiaojian Zhang Chao Chen | 2015 | Journal of Environmental Sciences2015，27，12： | 11 |
| 2 | A Novel Strategy to Fabricate Core-Sheath Structure Piezoelectric Yarns for Wearable Energy Harvesters显示文摘Wearable and portable electronic devices based on textile structure have been widely used owing to their wearability and comfortableness.However,yarn fineness and the comfort of the fabric cannot satisfy the requirements of smart wearable devices.This work presents a novel strategy to prepare highly integrated PVDF/conductive nylon core-sheath structure piezoelectric yarns for wearable which is fabricated by combining electrospinning strategy with 2D braiding technology.The fineness of single yarns as well as strength are both improved significantly compared to previous works.The piezoelectric outputs of the yarn are still stable after 800 s fatigue test at a frequency of 4 Hz,and the cycle stability can maintain more than 3200 cycles.Furthermore,the piezoelectric yarns are further woven into piezoelectric plain fabric.According to the electrical performance,the length of the piezoelectric yarn and the thickness of the piezoelectric layer would both affect the output electrical performance.The yarn of the 10 cm in length and 600μm in fineness can produce an output voltage of 120 mV.Meanwhile,Both the piezoelectric yarn and the fabric could generate piezoelectric output signals through human movement,such as bending,walking.Therefore,the electrical and mechanical performance of the piezoelectric yarns prepared in our work could be improved significantly,and the comfortableness and durability performance of the piezoelectric fabric can satisfy most wearing requirements,which would provide some help in the field of piezoelectric wearable devices based on yarns and fabrics. | Lili Xue Wei Fan Yang Yu Kai Dong Chengkun Liu Yanli Sun Cong Zhang Weichun Chen Ruixin Lei Kai Rong Qi Wang | 2021 | Advanced Fiber Materials2021，3，4： | 3 |
| 3 | SARS-CoV-2 Omicron RBD shows weaker binding affinity than the currently dominant Delta variant to human ACE2显示文摘Dear Editor,SARS-coronavirus-2(SARS-CoV-2)Omicron variant(B.1.1.529)is of great concern to the world due to its multiple mutations that may have an impact on transmissibility and immune evasion.1 Compared to the wild type(WT),Omicron carries as many as 30 single point mutations,3 deletion mutation and one insertion mutation on its spike protein.Strikingly,there are 15 mutations observed in the Omicron receptor-binding domain(RBD),10 of which are in the receptor-binding motif(RBM)that human angiotensin-converting enzyme 2(ACE2)and most monoclonal antibodies(mAbs)interact directly with.As a comparison,the currently dominant variant Delta(B.1.617.2)has only 2 mutations(L452R and T478K)in its RBM and additional K417N and E484K mutations sometimes.Therefore,Omicron variant may significantly impact the binding affinity to ACE2 and effectiveness of currently available mAbs.Consequently,Omicron mutant has aroused wide concern,many countries have taken measures on entry restrictions to prevent its rapid spread.However,the transmissibility and immune evasion risk of Omicron have not been properly evaluated. | Leyun Wu Liping Zhou Mengxia Mo Tingting Liu Chengkun Wu Chunye Gong Kai Lu Likun Gong Weiliang Zhu Zhijian Xu | 2022 | Signal Transduction and Targeted Therapy2022，7，2： | 2 |
| 4 | Coagulation studies for cellulose in the ammonia/ammonium thiocyanate(NHa/NH4SCN) direct solvent system 显示文摘 | Liu Chengkun John A Cuculo Brent Smith | 1989 | J Polym Sci:Part B: Polymer Physics1989，27，12： | 1 |
| 5 | Effects of dams on water and sediment delivery to the sea by the Huanghe (Yellow River): The special role of Water-Sediment Modulation显示文摘 | Yu Yonggui Shi Xuefa Wang Houjie Yue Chengkun Chen Shenliang Liu Yanguang Hu Limin Qiao Shuqing | 2014 | Anthropocene2014，，： | 1 |
| 6 | Research on the threshold effect of population aging on the industrial structure upgrading in China显示文摘This paper constructs coefficients of the integral and the internal structure upgrading in the secondary and tertiary industries, selects per capita real gross domestic product as a threshold variable and build panel threshold model according to inter-provincial panel data of China from 1998 to 2016. Results indicated that population aging has a double threshold effect on the integral industrial structure upgrading, whose influence increases first and then decreases, significantly promoting the upgrading process. As for internal structure, population aging has no significant threshold effect on the upgrading in the secondary industry, but exerts a single negative threshold effect in the tertiary industry. When economic development is under the threshold, its negative impact is greater. Further analysis also suggests that regional differences exist significantly in the threshold effect of population aging on the industrial structure upgrading. | Chengkun Liu Shuyu Li Xindong Zhao | 2019 | Chinese Journal of Population,Resources and Environment2019，17，1： | 1 |
| 7 | Construction of multi-homojunction TiO_(2)nanotubes for boosting photocatalytic hydrogen evolution by steering photogenerated charge transfer显示文摘As an effective means to improve charge carrier separation efficiency and directional transport,the gradient doping of foreign elements to build multi-homojunction structures inside catalysts has received wide attentions.Herein,we reported a simple and robust method to construct multi-homojunctions in black TiO_(2) nanotubes by the gradient doping of Ni species through the diffusion of deposited Ni element on the top of black TiO2 nanotubes driven by a high temperature annealing process.The gradient Ni distribution created parts of different Fermi energy levels and energy band structures within the same black TiO_(2) nanotube,which subsequently formed two series of multi-homojunctions within it.This special multi-homojunction structure largely enhanced the charge carrier separation and transportation,while the low concentration of defect states near the surface layer further inhibited carrier recombination and facilitated the surface reaction.Thus,the B-TNT-2Ni sample with the optimized Ni doping concentration exhibited an enhanced hydrogen evolution rate of~1.84 mmol·g^(−1)·h^(−1)under visible light irradiation without the assistance of noble-metal cocatalysts,~four times higher than that of the pristine black TiO_(2)nanotube array.With the capability to create multi-homojunction structures,this approach could be readily applied to various dopant systems and catalyst materials for a broad range of technical applications. | Jinbo Xue Shan Jiang Chengkun Lei Huan Chang Jiaqi Gao Xuguang Liu Qi Li Qianqian Shen | 2023 | Nano Research2023，16，2： | 0 |
| 8 | Community participation in the management of wetland nature reserve:a case study of Nanjishan Nature Reserve, Jiangxi, China显示文摘In recent years, more and more conflicts have emerged in the management of nature reserves, of which themain problem is that how to carry out the campaign of conservation along with the promotion of development of localeconomics. To resolve the actual problem in Nanjishan National Wetland Nature Reserve and explore the idiographicmethod of the management of the wetland reserve, some studying methods including face-to-face interviews, informaldiscussion with local leaders and officials, group discussion with local fishers, questionnaire, and job of the conversationstation have been carried out. The results show that the education level of the local people is low; only 5% of the localpeople have an opportunity to the junior college; the main income of the local people is fishing, which accounts for 70%more or less; and the income is coming down year by year because of the unreasonable way of fishing. To cope with theproblems, some reformative way of management and the development of the reserve are introduced, such as establishingan NOG that constitutes of local fishermen to achieve the goal of community co-management, developing Bed andBreakfast and so on. Through practice of the management of the participation of the local people, we draw the conclusionthat the local people have a great desire to improve their life level, and to make the co-management of the reserve easy,it is important for the managers to play the role of pilot including engrafting the new ideas, giving some subsidy toencourage the local people to take part in the management. In addition, making local people perceive value of the reserveand the close relation between reserve conservation and the promotion of level of their life. On this basis, they incline totake part in the management of the reserve. | Wang Chengkun Liu Jingling | 2007 | Ecological Economy2007，3，3： | 0 |
| 9 | Match and mismatched second-order sliding mode finite-time control with simple parameter conditions and its applications显示文摘In this paper,a class of second-order sliding mode controller is proposed for nonlinear uncertain systems.The finite-time stability of the nonlinear uncertain systems is achieved when the sliding mode is matched or unmatched.Compared with the previous second-order sliding mode controller,the parameter conditions of the controller are simple and can be given explicitly,and easy to obtain.Finally,the simulation results of dc motor system and dc–dc buck converter verify the effectiveness of the proposed controller in the case of matching and mismatching. | Jun Liu Chengkun Li | 2022 | Journal of Control and Decision2022，9，3： | 0 |
| 10 | Stabilization of an uncertain multiple-oscillator system显示文摘For a multiple-oscillator system that is subject to the uncertain gains ranging within compact sets,this paper presents a constructive stabilization design.Motivated by nested-saturation control methods,a nested controller that contains multiplicative coefficients is directly designed,and these coefficients are then determined in the stability analysis.By skillfully making transformations,elaborately constructing Lyapunov functions,and using an M-matrix principle,the stability analysis leads to the explicit inequality condition that is expressed by directly using the system parameters. | Huawen Ye Chengkun Li Xianting Qi Jun Liu | 2022 | Control Theory and Technology2022，20，3： | 0 |
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