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Determination of interfacial tension and viscosity under dripping flow in a step T-junction microdevice

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Chinese Journal of Chemical Engineering 2022年第2期35卷 210-218页

作者： Li Ma Yongjin Cui lin sheng Chencan Du Jian Deng Guangsheng Luo State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Microfluidic approaches for the determination of interfacial tension and viscosity of liquid-liquid systems still face some *** of them is liquid-liquid systems with low interfacial and high viscosity,because dripping flow in normal microdevices can’t be easily realized for the *** this work,we designed a capillary embedded step T-junction microdevice to develop a modified microfluidic approach to determine the interfacial tension of several systems,specially,for the systems with low interfacial tension and high *** method combines a classical T-junction geometry with a step to strengthen the shear force further to form monodispersed water/oil(w/o)or aqueous two-phase(ATP)droplet under dripping *** systems with low interfacial tension and high viscosity,the operating range for dripping flow is relative narrow whereas a wider dripping flow operating range can be realized in this step Tjunction microdevice when the capillary number of the continuous phase is in the range of 0.01 to ***,the viscosity of the continuous phase was also measured in the same *** different systems with an interfacial tension from 1.0 to 8.0 m N·m^(-1) and a viscosity from 0.9 to 10 m Pa·s were measured *** experimental results are in good agreement with the data obtained from a commercial interfacial tensiometer and a spinning digital *** work could extend the application of microfluidic flows.

关键词： Step T-junction Interfacial tension Viscosity Force balance

Protective Effect of Human Umbilical Cord Mesenchymal Stem Cells in Glucocorticoid-induced Osteonecrosis of Femoral Head

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Current Medical Science 2021年第5期41卷 909-915页

作者： Chen QIU Jian-lin ZHOU Shuang DENG lin-sheng LONG Hao PENG Department of Orthopedics Renmin Hospital of Wuhan UniversityWuhan 430060China Department of Orthopedics Xiangyang No.1 People's HospitalHubei University7 of MedicineXicingyang 443000China

Objective:To evaluate the effect of human umbilical cord mesenchymal stem cells(hUC-MSCs)on preventing rats from glucocorticoid-induced osteonecrosis of femoral head(GC-ONFH)in the early stage in vivo and to investigate the possible mechanism of hUC-MSCs in regulating the balance of osteogenesis and ***:All rats were randomly divided into 3 groups:control group(C group),model group(M group),and intervention group(Ⅰ group).The model of GC-ONFH was developed by a sequential administration of lipopolysaccharide and *** rats in the Ⅰ group were treated with caudal vein injection of *** weeks later,the blood samples were obtained to measure the activity of alkaline phosphatase(ALP)and the content of triglyceride(TG)in serum,and the femoral heads were harvested and observed by hematoxylin-eosin staining,Micro-CT,Western blot and real-time quantitative polymerase chain ***:After intervention of hUC-MSCs,the necrosis rate of femoral head decreased from 83%(10/12)to 33%(4/12),the rate of empty bone lacuna was significantly decreased,the activity of ALP increased significantly,the content of TG decreased significantly,the bone density increased obviously,the expression of RUNX2 and Col Ⅰ increased significantly and the expression of PPARγ decreased ***:These results revealed that caudal vein injection of hUC-MSCs can effectively reduce the incidence of GC-ONFH in rats by increasing ALP activity and reducing TG content in serum,increasing bone mineral density,promoting the expression of RUNX2 and Col I,and inhibiting the expression of PPARγ.

关键词： glucocorticoid-induced osteonecrosis of femoral head human umbilical cord mesenchymal stem cell RUNX2,ColⅠ,PPARγ

A diagrammatic categorification of q-boson and q-fermion algebras

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Chinese Physics B 2012年第2期21卷 1-8页

作者： Cai Li-qiang lin Bing-sheng Wu Ke School of Mathematical Sciences Capital Normal UniversityBeijing 100048China

In this paper, we study the diagrammatic categorification of q-boson algebra and also q-fermion algebra. We construct a graphical category corresponding to q-boson algebra, q-Fock states correspond to some kind of 1-morphisms, and the graded dimension of the graded vector space of 2-morphisms is exactly the inner product of the corresponding q-Fock states. We also find that this graphical category can be used to categorify q-fermion algebra.

关键词： categorification q-boson algebra q-Fock state q-fermion algebra

Fabrication of shish-kebab-structured carbon nanotube/poly(ε-caprolactone) composite nanofibers for potential tissue engineering applications

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Rare Metals 2019年第1期38卷 64-72页

作者： Tong Wu Xin Chen Jin Sha Yi-Yan Peng Yu-Lu Ma lin-sheng Xie Lih-sheng Turng Engineering Center of Efficient Green Process Equipment and Energy Conservation Ministry of Education East China University of Science and Technology School of Mechanical and Power Engineering East China University of Science and Technology Wisconsin Institute for Discovery University of Wisconsin-Madison

The electrospinning process was applied to fabricate the nanofibers of biodegradable poly(ε-caprolactone)(PCL) in which different contents of multiwalled carbon nanotubes(MWCNTs) were embedded. Afterward,the electrospun nanofibers were successfully decorated with shish-kebab structure via a self-induced crystallization technique. The topographical features and the mechanical properties of the composite scaffolds were characterized,and the biocompatibility of the material was assessed by using human osteogenic sarcoma osteoblasts(MG-63 cells). The carbon nanotube(CNT) concentration is found to affect the fiber diameter and mechanical properties of electrospun nanofibers and the periodic distance of the shish-kebab architecture. Cellular attachment and proliferation assays reveal that 0.5 wt% CNT-embedded PCL scaffold shows enhanced biocompatibility with MG-63 cells than their counterparts made of neat PCL, and the collagen-like nanotopology provided by the shish-kebab structure further facilitates the cell adhesion and proliferation. The superior interactions between cells and scaffolds demonstrate that the shish-kebab-structured CNTs/PCL nanofibers may be promising candidate for tissue engineering scaffold application.

关键词： Carbon nanotubes Poly(ε-caprolactone) Electrospinning Shish-kebab structure Tissue engineering

Measurement-device-independent quantum communication without encryption

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Science Bulletin 2018年第20期63卷 1345-1350页

作者： Peng-Hao Niu Zeng-Rong Zhou Zai-sheng lin Yu-Bo sheng Liu-Guo Yin Gui-Lu Long state Key Laboratory of Low-dimensional Quantum Physics Beijing 100084.China Department of Physics Tsinghua UniversityBeijing 100084China Collaborative Innovation Center of Quantum Matter Beijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China Beijing National Research Center for Information Science and Technology BeUing 100084China School of Information and Technology.Tsinghua University Beijing 100084China lnstiute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China College of Telecommunications &Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of EducationNanjing 210003China

Security in communication is vital in modern life. At present, security is realized by an encryption process in cryptography. It is unbelievable if a secure communication is achievable without encryption. In quantum cryptography, there is a unique form of quantum communication, quantum secure direct communication, where secret information is transmitted directly over a quantum channel. Quantum secure direct communication is drastically distinct from our conventional concept of secure communication, because it does not require key distribution, key storage and ciphertext transmission, and eliminates the encryption procedure completely. Hence it avoids in principle all the security loopholes associated with key and ciphertext in traditional secure communications. For practical implementation, defects always exist in real devices and it may downgrade the security. Among the various device imperfections, those with the measurement devices are the most prominent and serious ones. Here we report a measurementdevice-independent quantum secure direct communication protocol using Einstein-Podolsky-Rosen pairs. This protocol eradicates the security vulnerabilities associated with the measurement device,and greatly enhances the practical security of quantum secure direct communication. In addition to the security advantage, this protocol has an extended communication distance, and a high communication capacity.

关键词： Quantum secure direct communication Measurement-device-independent Quantum dialogue Encryption Cryptography

Paraventricular Thalamus as A Major Thalamic Structure for Wake Control

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Neuroscience Bulletin 2019年第5期35卷 946-948页

作者： Yu-Feng Shao Jian-sheng lin Yi-Ping Hou Departments of Neuroscience Anatomy Histology and Embryology Key Laboratory of Preclinical Study for New Drugs of Gansu Province School of Basic Medical Sciences Lanzhou University Lanzhou 730000 China Integrative Physiology of the Brain Arousal Systems Lyon Neuroscience Research Center Lyon 69373 France

The thalamus is the gate of the cerebral cortex, the ultimate target for the neural networks controlling behavioral states and cognitive functions. According to the reticular theory initially proposed by Moruzzi and Magoun, excitatory inputs from large reticular zones of the brainstem via widespread intra- and extra-thalamocortical systems finally activate the cerebral cortex to cause generalized cortical activation and wakefulness [1]. This theory proposes a central relay role to the thalamus for cortical activation as supported by early studies using neurodegeneration techniques and by the elegant work of Steriade’s group and other investigators illustrating the electrophysiological mechanisms of the thalamocortical system at the cellular level during wakefulness, rapid eye-movement sleep (REMs) and non-REM sleep (NREMs)[2].

关键词： Paraventricular Thalamus Thalamic Structure Wake Control

Crustobody's movement and evolution and its relationship with Cu-Au mineralization of Eastern Tianshan, Xinjiang

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Journal of Central South University of Technology 2005年第Z1期12卷 150-156页

作者： YANG Mu PENG sheng-lin SUN Bao-sheng YANG Bin Institute of Diwa Theory and Metallogeny Central South University Changsha 410083 China Laboratory of Marginal Sea Geology Guangzhou Institute of Geochemistry and South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510640China Institute of Diwa Theory and Metallogeny Central South University Changsha 410083 China College of Resources and Environment Xinjiang University Urumchi 830008 China Institute of Diwa Theory and Metallogeny Central South University Changsha 410083 China

Eastern Tianshan, a cardinal part of Northern Xinjiang compound continental crustoblock, is located in the east of Tianshan Diwa region. By analysis of regional geological and geophysical data, and by using crustobody theory and researching methods, this region can be divided into three sectors of different crustal structure. During Proterozoic to Eopaleozoic, the spreading and closing of Northern Tianshan Sea, on the foundation of disparate continental basements of each sectors, the transversal heterogeneity of tectonic movement and evolution resulted in the diversity of crustal structure and material formations. The metallogenic evolution indicated that different geotectonic evolution periods had not only different characteristics of mineralization commodity and mineral deposit types, but also the progressive mineralization feature. In Neopaleozoic, the closing of Northern Tianshan Sea from north to south and the difference of transmeridional tectonic deformation and magmation formed in the movement constituted the different metallogenic environment in shallow crust. Furthermore, it brought on the diverse Cu-Au-polymetal mineral deposit types and metallogenetic epoch from north to south and from west to east.

关键词： geotectonics crustobody Cu-Au-polymetal mineralization Eastern Tianshan

Metathesis of Butylene-2 and Ethylene to Propylene over 3.0Mo/(Hβ+γ-Al_(2)O_(3))Catalysts with Differentγ-Al_(2)O_(3)Contents

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Chemical Research in Chinese Universities 2005年第2期21卷 213-216页

作者： LIU sheng-lin HUANG sheng-jun XIN Wen-jie BAI Jie XIE Su-juan XU Long-ya Laboratory of Natural Gas Utilization and Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023P.R.China

A series of 3.0Mo/(Hβ+γ-Al_(2)O_(3))samples withγ-Al_(2)O_(3)contents in the range of 0_100%(mass fraction)was studied by means of XRD,NH_(3)-TPD,TPR and BET determinations for characterizing their *** Hβzeolite structure in the 3.0Mo/Hβsample can be effectively stabilized by adding someγ-Al_(2)O_(3)to Hβzeolite.γ-Al_(2)O_(3)mainly favors the formation of polymolybdate or multilayered Mo oxide,while Hβmainly forms the Al_(2)(MoO_(4))_(3)species,as evaluated by the TPR *** used as the catalyst for the metathesis of butylene-2 and ethylene to propylene,there exists a close correlation between the specific surface area and stability of the *** specific surface area of the catalyst shows the maximum when{(Hβ+}γ-Al_(2)O_(3))contains 30%γ-Al_(2)O_(3),which is in agreement with that of the time needed for the reaction *** the case of maximum surface area,the rate of coke deposition is the minimum.

关键词： Butylene-2 Ethylene Propylene Metathesis Mo-impregnated(Hβ+γ-Al_(2)O_(3))catalyst {γ-Al_(2)O_(3)}content TPR/TPD/XRD characterization

A novel Ireland-Claisen rearrangement/Diels-Alder tandem reaction of propargylic acrylates with acyclic dienophiles

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Chinese Chemical Letters 2013年第2期24卷 137-139页

作者： Yun-Xia Li Yi-lin sheng Bi-Song Zhang College of Pharmaceutics and Material Engineering Jinhua College of Profession and Technology

Received 18 October 2012 Received in revised form 14 December 2012 Accepted 21 December 2012 Available online 29 January 2013

关键词： lreland-Claisen rearrangementDiels-Alder reactionTandem reactionPropargylic acrylates