Experimental study on the seismic behavior of coupled shear wall with concealed partitioned steel plates

To study the seismic behavior and post-earthquake repairability of coupled shear wall with concrete filled steel tube (CFST) frame and concealed partitioned steel plates (SPs), three 1/5 scaled coupled shear wall specimens were designed with different type of CFST column or core structure. Low-cycle reversed loading was adopted in the test. The test contained two stages. Load-carrying capacity, energy dissipation, ductility, stiffness and failure characteristic of the specimens were compared in pre-repair stages and post-repair stages. The conclusions are drawn that the core structure shows a good ductile yielding mechanism. The cross-section type of frame has an obvious effect on the seismic behavior of shear wall. After damage and strengthening, the new coupled shear wall still has enough seismic capacity and good energy dissipation capacity, and it is easy to be repaired after earthquake. Finite element analysis software ABAQUS has been used to simulate the behavior of coupled shear wall. Ultimate strength is obtained with the vibration of thickness of SPs

Seismic behavior of bifurcated concrete filled steel tube columns with a multi-cavity structure

In order to meet the architecture and construction needs of high rise buildings, the special-shaped columns are becoming more and more widely used. In this study, cyclic tests on seven special-shaped bifurcated Concrete Filled Steel Tube (CFST) columns are carried out. Test variables are the column cross section types and the loading directions. The strength, ductility, hysteretic behavior, energy dissipation ability, failure modes and seismic mechanisms are analyzed. Test results show that: the cross-section type of the column is the main factor influencing the seismic behavior of the specimens. Compared with the basic cross section type, the strength, ductility and energy dissipation capacity of the strengthened cross section type all significantly increased. The cross sections with the inserted angle steel or circular steel tube have the best comprehensive seismic behavior. Also, the loading direction has a considerable influence on the seismic behavior. Compares with the short axis loading specimen C1-Y, the strength of the long axis specimen C1-X and 45° axis C1-Z increase by 92.5 % and 44.0 %, respectively, indicating that the differences in loading direction should be taken into consideration in the seismic design. Based on the test results, the FEM analysis are also carried out. The FEM results show a satisfactory agreement with experimental results. The concrete constitutive relationship and modelling method proposed is suitable for the simulation of special-shaped bifurcated CFST columns with multiple cavities

Seismic behaviour of composite shear wall with steel reinforced concrete frame and embedded perforated-steel plate

U radu se ispituje pet uzoraka posmičnih stijena raznih dimenzijskih i konstrukcijskih karakteristika kako bi se istražilo seizmičko ponašanje spregnute posmične stijene s armiranobetonskim okvirom ojačanim čelikom i ugrađenom perforiranom čeličnom pločom. Osim toga, niskociklično opterećenje se nanosi na uzorke s koeficijentom posmične zone od 1,5. Eksperimentalni podaci koriste se za analizu nosivosti, krutosti, duktilnosti, histerezne energije i karakteristika otkazivanja spomenutih uzoraka. Rezultati pokazuju da se spregnuta posmična stijena s armiranobetonskim okvirom ojačanim čelikom i ugrađenom čeličnom pločom odlikuje većom nosivošću, boljom duktilnošću, sporijim padom krutosti te većom sposobnošću rasapa energije u usporedbi s običnim armiranobetonskim posmičnim zidom. Osim toga, primjenom ugrađenih čeličnih ploča odgovarajuće debljine poboljšava se i seizmičko ponašanje spregnutih posmičnih stijena. Analizom čeličnih ploča iste debljine utvrđeno je da se uzorci s čeličnim vezicama seizmički bolje ponašaju od uzoraka sa zavarenim svornjacima. U završnom je dijelu razvijen računalni model za izračunavanje nosivosti CSW-a. Usporedba pokazuje dobru podudarnost rezultata proračuna i rezultata dobivenih mjerenjem.Experiments are conducted on five shear wall specimens of varying design and structural measures in order to investigate seismic behaviour of a composite shear wall with the steel-reinforced concrete frame and an embedded perforated-steel plate. In addition, low-cyclic load is applied on test specimens that have a shear span ratio of 1.5. Using the experimental data, the bearing capacity, stiffness, ductility, hysteretic energy, and failure characteristics of five specimens are analysed. The results show that the composite shear wall (CSW) with the steel reinforced concrete frame (SRCF) and embedded steel plate (ESP) has higher bearing capacity, better ductility, slower degradation of stiffness, and higher energy dissipation capacity, as compared to an ordinary reinforced concrete shear wall. Moreover, its seismic behaviour can be improved by using the ESP of an appropriate thickness. For the ESPs of identical thickness, the results show that the specimen that uses steel ties exhibits better seismic behaviour than those using welding studs. Finally, a computing model that can calculate the bearing capacity of the CSWs is developed. A comparison of calculated and measured results shows that the results are close to each other

Type III interferon exerts thymic stromal lymphopoietin in mediating adaptive antiviral immune response

Previously, it was believed that type III interferon (IFN-III) has functions similar to those of type I interferon (IFN-I). However, recently, emerging findings have increasingly indicated the non-redundant role of IFN-III in innate antiviral immune responses. Still, the regulatory activity of IFN-III in adaptive immune response has not been clearly reported yet due to the low expression of IFN-III receptors on most immune cells. In the present study, we reviewed the adjuvant, antiviral, antitumor, and disease-moderating activities of IFN-III in adaptive immunity; moreover, we further elucidated the mechanisms of IFN-III in mediating the adaptive antiviral immune response in a thymic stromal lymphopoietin (TSLP)-dependent manner, a pleiotropic cytokine involved in mucosal adaptive immunity. Research has shown that IFN-III can enhance the antiviral immunogenic response in mouse species by activating germinal center B (GC B) cell responses after stimulating TSLP production by microfold (M) cells, while in human species, TSLP exerts OX40L for regulating GC B cell immune responses, which may also depend on IFN-III. In conclusion, our review highlights the unique role of the IFN-III/TSLP axis in mediating host adaptive immunity, which is mechanically different from IFN-I. Therefore, the IFN-III/TSLP axis may provide novel insights for clinical immunotherapy

STUDY ON THE SEISMIC PERFORMANCE OF RECYCLED AGGREGATE CONCRETE-FILLED LIGHTWEIGHT STEEL TUBE FRAME WITH DIFFERENT ASSEMBLY JOINTS

In order to investigate the construction of column-to-beam joints and to understand the effect of recycled aggregate concrete (RAC) and cross-section of beams and columns on the seismic performance of recycled aggregate concrete-filled light steel tubular frame structure, four new types of assembly joints were proposed in this paper. A low cyclic loading test of six frame specimens was carried out. The failure characteristic, load bearing capacity, hysteresis property, ductility, strength and stiffness degradation, and energy dissipation were analysed. The damage process of the specimen was simulated using the ABAQUS software, and the results agreed well with those obtained from the experiments. The results showed that the construction pathway of the joints exhibited significant influence on the seismic performance of the frame. The proposed reinforced joint (using angle steel and stiffeners) significantly improved the bearing capacity, stiffness and energy dissipation capacity of the recycled aggregate concrete-filled steel tube frame. The seismic performance of the steel frame was improved, while the energy dissipation capacity increased by 635.7% using RAC filled in the steel tubes. Finally, by appropriately increasing the size of cross-section on the beams and columns can improve the bearing capacity, stiffness and ductility of the structure

Association of TIMP4 gene variants with steroid-induced osteonecrosis of the femoral head in the population of northern China

Background In clinical treatment, the use of steroid hormones is an important etiological factor of non-traumatic osteonecrosis of the femoral head (ONFH) risk. As an endogenous inhibitor of matrix metalloproteinases (MMPs) in the extracellular matrix, the expression of tissue inhibitors of metalloprotease-4 (TIMP4) plays an essential role in cartilage and bone tissue damage and remodeling, vasculitis formation, intravascular thrombosis, and lipid metabolism. Methods This study aimed to detect the association between TIMP4 polymorphism and steroid-induced ONFH. We genotyped seven single-nucleotide polymorphisms (SNPs) in TIMP4 genes and analyzed the association with steroid-induced ONFH from 286 steroid-induced ONFH patients and 309 normal individuals. Results We performed allelic model analysis and found that the minor alleles of five SNPs (rs99365, rs308952, rs3817004, rs2279750, and rs3755724) were associated with decreased steroid-induced ONFH (p = 0.02, p = 0.03, p = 0.04, p = 0.01, p = 0.04, respectively). rs2279750 showed a significant association with decreased risk of steroid-induced ONFH in the Dominant and Log-additive models (p = 0.042, p = 0.028, respectively), and rs9935, rs30892, and rs3817004 were associated with decreased risk in the Log-additive model (p = 0.038, p = 0.044, p = 0.042, respectively). In further stratification analysis, TIMP4 gene variants showed a significant association with steroid-induced ONFH in gender under the genotypes. Haplotype analysis also revealed that “TCAGAC” and “CCGGAA” sequences have protective effect on steroid-induced ONFH. Conclusion Our results indicate that five TIMP4 SNPs (rs99365, rs308952, rs3817004 rs2279750, and rs3755724) are significantly associated with decreased risk of steroid-induced ONFH in the population of northern China

Some Effects of Co on the Electrochromic Properties of NiO xH y Film

本文利用阴极化电沉积法在抛光镍板及ＩＴＯ玻璃表面制备了含Ｃｏ量为１６．２％的ＮｉＯｘＨｙ薄膜，薄膜厚度分别为４２ｎｍ、２１ｎｍ，采用透射光谱以及线性电位扫描、交流阻抗和阳极稳态极化曲线等测试技术，考察了Ｃｏ对ＮｉＯｘＨｙ薄膜电致变色性能的影响，光谱测试范围为３００～２５００ｎｍ．结果发现：Ｃｏ能降低薄膜着色态在可见光区及部分近红外区的透过率，通过电压调节不仅可以调光而且可望能够控温；同时Ｃｏ还能降低ＮｉＯｘＨｙ薄膜电致变色电位，升高薄膜氧化着色过程中的氧析出过电位，对薄膜的电致变色性能有改进作用，但降低了着色过程中质子的扩散系数．Some effects of Co addition upon the electrochromic characteristics of a nic_kel hydroxide film were studied. The films were electrodeposited on both polished Ni plate and conductive ITO glass. The electrochemical behaviors were investigated using the film on Ni plate by linear potential sweep, a.c. impedance, and anodic polarization curves for OER(oxygen evolution reaction). It was found that Co can lower the working voltage and raise the oxygen overpotential, but has little effect on the reaction kinetics. It was also found that the Co can improve the optical properties of the electrochromic film.作者联系地址：南开大学新能源材料化学研究所Author's Address: Inst. of New Energy Material Chem. Nankai Univ., Tianjin 30007

Solvothermal synthesis and thermoelectric properties of indium telluride nanostring-cluster hierarchical structures

A simple solvothermal approach has been developed to successfully synthesize n-type α-In2Te3 thermoelectric nanomaterials. The nanostring-cluster hierarchical structures were prepared using In(NO3)3 and Na2TeO3 as the reactants in a mixed solvent of ethylenediamine and ethylene glycol at 200°C for 24 h. A diffusion-limited reaction mechanism was proposed to explain the formation of the hierarchical structures. The Seebeck coefficient of the bulk pellet pressed by the obtained samples exhibits 43% enhancement over that of the corresponding thin film at room temperature. The electrical conductivity of the bulk pellet is one to four orders of magnitude higher than that of the corresponding thin film or p-type bulk sample. The synthetic route can be applied to obtain other low-dimensional semiconducting telluride nanostructures

The Heat Transfer Coefficient of Recycled Concrete Bricks Combination with EPS Insulation Board Wall

Four tectonic forms samples were conducted to test their heat transfer coefficients. By analyzing and comparing the test values and theoretical values of the heat transfer coefficient, a corrected-value calculation method for determining the heat transfer coefficient was proposed; the proposed method was proved to be reasonably correct. The results indicated that the recycled concrete brick wall heat transfer coefficient is higher than that of the clay brick wall, the heat transfer coefficient of recycled concrete brick wall could be effectively reduced when combined with the EPS insulation board, and the sandwich insulation type was better than that of external thermal insulation type