莴笋+鲜食玉米轮作模式下高效设施栽培模式探讨

天津市为了有效利用当地独特的地理气候资源,丰富蔬菜供给,提高土地利用率及种植效益,在多年生产实践基础上总结了“莴笋-鲜食玉米-鲜食玉米”和“莴笋—鲜食玉米—莴笋”两种一年多茬的轮作栽培模式,包括作物茬口安排、田间种植管理技术要点、病虫害防治、适时采收等,利用冷棚设施栽培,大大提高土地复种指数,减少病虫害发生,提高种植经济收益。通过2年的试验示范,收到了良好效果,可为京津冀地区发展设施农业种植区提供有益参考。

The Determination and Evaluation of the Biological Activities for the Commercialization of Recombinant Follicle-Stimulating Hormone in Vitro

Follicle-stimulating hormone (FSH) plays a central role in mammals reproduction, with the actions of FSH mediated by follicle-stimulating hormone receptors (FSHRs) on the surface of target cells. The purposes of this study were to determine and evaluate the biological activities for the commercialization of recombinant follicle-stimulating hormone (rFSH) in vitro through the cellular internalization using cloned 293T-FSHR cell lines as target. Using imaging approaches we have found here that a little fluorescent signal from the surface of the cell transferred to the cytoplasm and accumulated around the nucleus by endocytosis. Compared with the control groups, the commercialization of rFSH have not the significant differences of internalization, but the rFSH have promoted the internalization of the fluorescent, suggested that this detection system might as a protocol for the bioactivity of recombinant therapeutic proteins in vitro.

自身免疫性甲状腺炎与乳腺癌关系的Meta分析

目的通过收集整理相关数据明确自身免疫性甲状腺炎与乳腺癌关系。方法通过计算机检索Pub Med、Cochrane图书馆、Embase、谷歌学术等英文数据库,检索时间截至2017年5月15日有关自身免疫性甲状腺炎与乳腺癌相关的文献,提取相关数据并用Stata 12.0软件进行统计分析。结果共纳入9篇横断面研究(累计样本量1 325例),经Meta分析,显示甲状腺过氧化物酶抗体(TPOAb)、甲状腺球蛋白抗体(TGAb)对乳腺癌的作用合并效应Ol^R值分别为2.66(95%CI:1.93,3.68)、2.30(95%CI:1.67,3.18),差异有统计学意义。结论乳腺癌患者中血清TPOAb和TGAb高于健康者。

内镜下乳头球囊扩张术治疗胆总管结石的安全性和长期疗效

背景内镜下乳头球囊扩张术(endoscopic papillary balloon dilation,EPBD)是治疗胆总管结石(common bile duct stones,CBDSs)-种有效方法,但其安全性及长期疗效却缺乏评价.本研究拟分析EPBD治疗CBDSs的安全性和长期疗效.目的评估EPBD治疗CBDSs的安全性和长期疗效.方法分析我院2014-01/2015-12期间收治的CBDSs患者行EPBD的资料.主要观察指标为CBDSs清除率、内镜下逆行性胰胆管造影术(endoscopic retrograde cholangiopancreatography,ERCP)相关并发症和CBDSs复发率.结果42例CBDSs患者进行了EPBD,全部患者均完成了结石清除(100%).ERCP相关并发症发生4例(4/45,8.8%),均为术后胰腺炎,没有穿孔、出血及胆管炎的发生.在随后进行平均时间为51.8 mo(18-66 mo)随访中,10例(10/42,23.8%)患者CBDSs复发.单因素分析提示女性(比值比=22.891,95%可信区间:1.544-339.362,P=0.023)是结石复发的危险因素.结论EPBD治疗CBDSs是安全和有效的.长期随访发现,女性可能是结石复发的危险因素.

二甲双胍增强索拉菲尼诱导HepG2细胞凋亡的分子机制

背景延长进展期肝癌生存时间是目前临床上一大难点.索拉菲尼(Sorfenib,Sor)是目前唯一用于治疗进展期肝癌的靶向药物,但其耐药成为一个问题.本研究拟通过实验研究二甲双胍(Metformin,Met)增强Sor的疗效,为进展期肝癌的治疗提供参考.目的探讨Met增强Sor诱导人肝癌HepG2细胞凋亡及潜在分子机制.方法MTT法检测Met、Sor及二者联合对人肝癌HepG2细胞的增殖抑制作用,流式细胞仪测定各组的凋亡率;Western blot检测各组表达Caspase-3、Bax、AMPK、P53及mTORC1水平.结果MTT结果显示Met和Sor联合对HepG2细胞的增殖抑制作用强于单药组、对照组、Met组、Sor组、联合用药组的细胞相对活力分别为100%、79.96%±4.41%、85.33%±1.00%、68.60%±4.02%,差别有统计学意义(P<0.05);流式细胞分析结果显示Met和Sor联合对HepG2细胞的凋亡诱导作用强于单药组、对照组、Met组、Sor组、联合用药组的凋亡率分别为4.47%±1.93%、13.73%±1.18%、9.50%±0.20%、29.03%±0.35%,差别有统计学意义(P<0.05);Western blot显示,与对照组及单药组相比,联合用药组Caspase-3、Bax、AMPK、P53的表达增加,而mTORC1的表达减少.结论Met可增强Sor诱导人肝癌HepG2细胞凋亡.

金纳米粒子的尺寸以及金-二氧化钛相互作用对表面等离激元光催化产氧的影响（英文）

表面等离激元共振效应具有独特的光-物质相互作用的性质,因而近年来被广泛的应用到太阳能转化科学领域.通过调变金属的性质(例如组分、尺寸、形貌等)可以方便地在整个太阳能光谱范围内调节其等离子共振吸收性质,从而有效地增加光催化剂的捕光效率.尽管如此,等离激元光催化目前的能量转化效率仍处于很低的水平,主要是由于光催化剂中的电荷分离以及利用效率很低.理论上可以通过控制优化金属纳米粒子的尺寸以及金属-半导体的相互作用来促进电荷分离及利用效率,从而提高光催化剂的活性.然而,关于金属纳米粒子的尺寸以及金属-半导体的相互作用在表面等离激元光催化剂中的具体作用还亟待详细研究.本文以金/二氧化钛作为典型的表面等离激元光催化剂,通过简便的焙烧后处理可同时实现金粒子尺寸和金-氧化钛界面相互作用的调控.我们发现,催化剂的可见光产氧活性随着焙烧温度呈现火山型关系,其中600 ℃处理的样品表现出最高的活性,在560 nm出的表观量子效率为0.3%,接近甚至超过文献报道的同类结果.随后通过X射线衍射、扫描电镜、光电子能谱、紫外可见光谱等表征手段系统地研究了煅烧温度对于金粒子尺寸和金-氧化钛相互作用的影响.从结果表明,通过不同温度焙烧并未改变二氧化钛自身的性质,且随着温度的升高,金尺寸在600℃之前变化较小,随后突然快速长大.在排除了不同样品的吸光性能的差异后发现,产氧活性随着Au尺寸长大而减少.从光电子能谱的结果发现,金-二氧化钛的界面相互作用随焙烧温度升高而逐步增强.进一步地,通过界面周长的归一化活性得出界面相互作用与产氧活性呈现近似线性关系.最后,通过对光沉积Au样品进行不同温度的煅烧发现大尺寸Au的粒径不随煅烧温度变化,而此时的产氧活性却随焙烧温度增加而增加,这进一步验证了界面相互作用对光催化水氧化的促进作用.综合以上结果可知,最终的等离激元诱导的可见光产氧活性是由尺寸与界面相互作用共同影响的结果,尺寸和界面相互作用的变化会共同影响热电子转移效率和表面反应效率,从而改变整体的光催化产氧效率.

Isolation and bioinformatics analysis of differentially methylated genomic fragments in human gastric cancer

AIM:To isolate and analyze the DNA sequences which are methylated differentially between gastric cancer and normal gastric mucosa. METHODS: The differentially methylated DNA sequences between gastric cancer and normal gastric mucosa were isolated by methylation-sensitive representational difference analysis (MS-RDA). Similarities between the separated fragments and the human genomic DNA were analyzed with Basic Local Alignment Search Tool (BLAST). RESULTS: Three differentially methylated DNA sequences were obtained, two of which have been accepted by GenBank. The accession numbers are AY887106 and AY887107. AY887107 was highly similar to the 11th exon of LOC440683 (98%), 3' end of LOC440887 (99%), and promoter and exon regions of DRD5 (94%). AY887106 was consistent (98%) with a CpG island in ribosomal RNA isolated from colorectal cancer by Minoru Toyota in 1999. CONCLUSION: The methylation degree is different between gastric cancer and normal gastric mucosa. The differentially methylated DNA sequences can be isolated effectively by MS-RDA.

Construction of Overexpression Vector of ACBP Gene in Zygosaccharomyces rouxii

The Zygosaccharomyces rouxii is a kind of fermentation yeast which yield flavoring substance in the production of soy sauce. In order to the overexpression of the target protein in wild type strains, we choose PYEs2.0 as the original carrier, the acyl-coA binding protein (ACBP) and GFP gene have been cloned in the multiple cloning site. The screening of labeled URA3 gene was replaced by KanMX gene which anti G418. The vector was obtained through the screening of G418 at the concentration of 25 ug/ml.

EPR study of charge separation associated states and reversibility of surface bound superoxide radicals in SrTiO_(3) photocatalyst

Understanding the processes of charge generation, transfer and capture is important for the design and synthesis of efficient photocatalysts. In this work, light-induced charge separation and effect of O_(2) on electron transfer processes in SrTiO_(3) were investigated by electron paramagnetic resonance(EPR). It was found that photoinduced electron transfer from O_(2)- to Ti^(4+) produced Ti^(3+) and O- redox radical pairs under vacuum condition. Under oxygen atmosphere, however, surface bound superoxide radicals O_(2)-were formed by electron reduction of adsorbed oxygen at initial photoirradiation stage, and quenched by the reverse electron transfer to Ti^(4+) upon further photoirradiation. Formation of long-lived charge separation associated [Ti^(3+)---O-] species and the reversibility of surface bound superoxide radicals mediating the processes of photogenerated electrons may be accountable for the high activity of SrTiO_(3) in photocatalytic water splitting reaction.

Influence of plasma-induced reflected wave variations on microwave transmission characterization of supersonic plasma excited in shock tube

In this work,the theoretical analysis and experiment results investigating the influence of plasma-induced reflected wave variations on microwave transmission characterization are presented.Firstly,an analytical transmission line model for transmission characterization of plasma in shock tube is derived and validated against full-wave simulation.Then,the theoretical analysis of transmission characterization based on a time-dependent reconstruction algorithm that takes into account the variations of reflected wave is presented and the influence of reflection variations under various states of plasma is also investigated.The unusual increase in the amplitude of transmitted wave is theoretically predicted and experimentally demonstrated as well.Finally,the experiment results are also presented to illustrate the effects of reflected wave variations in practical microwave transmission characterization of supersonic plasma excited in shock tube.

The Observation of FSH’s Cellular Internalization

Follicle stimulating hormone (FSH) is a kind of glycoprotein gonadotropin, and plays an important role in the diagnosis and treatment of infertility. Follicle stimulating hormone receptor (FSHR) is a kind of G protein coupled receptor (GPCR), found in the ovary and testes, and its activation is required for the hormonal operation during the breeding period. In this study, an experimental model of FSHR mediated FSH into cell membrane, which exhibited a phenomenon of fluorescent localized on cell surfaces internalized into cell interior, was established to verify biological activity of FSH.

Discussion on Structure Design and Optimization of Building Curtain Wall

To discuss the structure design and optimization of building curtain wall, the dynamic characteristics of point supported glass curtain wall system are analyzed by the finite element method. The various technologies are made use of, and according to the characteristics of the structure system, the finite element analysis model with steel structure glass plate beam element and shell element as the basic elements is established. Then, the dynamic characteristics are analyzed, and the modal parameters such as inherent frequency and vibration type are identified. The research results show that the node displacement response power spectrum under the load of wind is obtained, which provides the basis for rationally optimizing the structure. Based on the above findings, it is concluded that the optimization design based on finite element model has a wide significance, which is a useful attempt to reduce the blindness of design and has great engineering significance and application value.

Synthesis of N,O-rich active site porous polymers and their efficient recovery of Gd(Ⅲ) from solution

Our previous study found that the adsorption performance of porous carbon for Gd(Ⅲ) could be significantly improved by increasing the N,and O functional groups on its surface.Unfortunately,the adsorption capacity of porous carbon is low due to the limited number of N,and O functional groups that can be loaded on its surface.Due to the advantage of customizable functional groups of porous organic polymers(POPs),the triazine-based Tb-MEL and hydroxyl-modified triazine-based Tp-MEL were synthesized by a one-step hydrothermal method using nitrogen-rich melamine as the raw material and triformylbenzene(Tb) and 2,4,6-triformylphloroglucinol(Tp),respectively.The Gd(Ⅲ) adsorption isotherms and kinetic curves of Tb-MEL,and Tp-MEL at pH=6 and T=25℃ are in high agreement with the Langmuir isotherm(R^(2)>0.998) and pseudo-second-order kinetics(R^(2)>0.993),respectively.The fitted maximum adsorption capacity(q_(max)) is about 136.05 mg/g,much higher than 58.38 mg/g of Tb-MEL.The adsorption efficiency for Gd(Ⅲ) at pH=7 is close to 100%,and Tp-MEL maintains 62.4% of the initial adsorption capacity after ten cycle s of sorption/desorption of Gd(Ⅲ),with an average elution efficiency of more than 90%.Adsorption selection performance tests show that Tp-MEL has good adsorption selectivity for HREE ions,and the selectivity is as follows:Lu^(3+)>Y^(3+)>Gd^(3+)>Nd^(3+)>La^(3+)>Al^(3+)>Ca^(2+)>Mg^(2+).Batch adsorption,Brunauer-Emmett-Teller(BET) method,and X-ray photoelectron spectrometer(XPS)tests show that hydroxyl modifications lose the specific surface area of the polymer,and the functional groups contribute more to the adsorption performance than the specific surface area.

Molecular and functional analysis of chitin synthase genes in Chilo suppressalis(Lepidoptera:Crambidae)

The rice stem borer,Chilo suppressalis,has developed a high level of resistance to many of the compounds currently used for control.There is therefore an urgent need to develop novel control methods for C.suppressalis.Insect chitin synthases(CHS)have attracted interest as a potential target for insect pest management.However,to date,CHS have not been characterized in C.suppressalis.Two CHS genes(CsCHSI and CsCHS2)were identified and cloned from C.suppressalis.Two transcript variants were identified for CsCHS1,CsCHSla and CsCHS1b.Spatiotemporal expression profiling showed that both transcripts of CsCHS1 are most highly expressed on the last day of each larval instar stage and show the highest expression levels in the integument.In contrast,CsCHS2 is predominantly expressed during the larval feeding stages and shows the highest expression levels in the midgut.Knockdown of CsCHSI by RNA interference significantly inhibited the molting and pupation of C.suppressalis,and knockdown of CsCHS2 significantly affected growth during the larval stage,but had no significant effect on the pupation.Moreover,knockout of CsCHS1 by CRISPR/Cas9 genome editing severely lowered the hatching rate,larval survivorship,pupation rate,and eclosion rate,but only larval survivorship at the GO generation was lowered after the knockout of CsCHS2.These results demonstrate that CsCHS1 and CsCHS2 play vital roles in the growth and development of C.suppressalis,and so have potential as insecticidal targets for the control of this highly damaging pest.

张弦拱桁架结构基于模态参数的损伤识别试验（英文）

张弦桁架结构是是由上部刚性拱桁架与下部柔性拉索通过中部撑杆组合而成的一种自平衡体系,具有受力合理、承载能力高、造型轻盈、跨度大等优点,被广泛应用到大跨钢屋盖结构中。但张弦桁架结构规模大、服役期限长,所处环境状况复杂,受到的荷载作用具有随机性,发生损伤的潜在危险性较大。此类结构一旦出现损伤会对结构的正常使用产生影响,甚至可能引起连续倒塌,因此研究张弦桁架结构在运营期的损伤识别具有重要的现实意义。但张弦梁结构中存在拉索、撑杆和桁架等不同类型杆件,受力机理更加复杂,其损伤识别与常规桥梁式结构或多高层建筑结构存在明显差异,目前针对张弦桁架结构的损伤识别尤其试验研究很少。因此,针对张弦桁架结构基于模态参数的损伤识别方法开展试验研究。通过对某火车站顶棚结构进行缩尺简化,设计制作了两榀张弦桁架试验模型。两榀试验模型结构尺寸相同,模型总长6 m,矢高0.4 m,垂度0.4 m,上部采用倒三角立体桁架,每两个节点之间由四角锥基本单元构成,结构中部均匀布置5根对称的圆钢管撑杆,下部布置直径8 mm的钢丝绳拉索,并施加2 kN预应力;试验模型一端为固定铰支座,另一端为滑动铰支座,并在结构两侧设置刚架作为受压桁架侧向支撑。两榀试验模型构件截面尺寸不同,模型1相对于模型2杆件截面尺寸较小;荷载施加情况不同,模型1未施加外荷载,模型2在模型上弦杆布置质量块模拟结构正常使用状态的荷载。试验采用不同截面尺寸杆件替换正常杆件的方法来模拟结构损伤,即通过降低截面刚度的方法来模拟杆件损伤,根据杆件截面积丧失程度定义损伤程度。试验设计了弦杆单损伤、多损伤、索撑损伤等不同程度以及不同位置的损伤工况,通过动力检测获取试验各工况前三阶模态参数:采用单点拾振、多点激励的方式进行试验,即将加速度传感器安装在桁架上弦杆件的4号节点处,然后用力锤依次对1~14号节点进行锤击,每个节点锤击激励1 min,通过动态信号采集仪采集加速度信号;根据不同工况替换相应损伤杆件,依次采集加速度信号;接着利用TSTMP模态分析软件处理加速信号,获取张弦桁架每个工况的频率与振型等模态数据,以用于之后的损伤识别分析。张弦桁架结构相对复杂,杆件繁多,可能发生损伤的部位较多,单一损伤识别方法无法一次检测出结构各部分的健康状态。因此将张弦桁架结构分为上部刚性桁架与索撑体系两部分,针对各组成部分的特点,采用基于振动模态参数的组合识别方法对张弦桁架试验结果进行分析:上部刚性桁架对结构整体频率影响较小且杆件连续,运用曲率模态差和模态柔度差曲率对其进行损伤识别;下部索撑体系杆件相对独立且单元数量相对较少,通过选取正则化频率变化率建立索撑体系频率指纹库的方法对其进行损伤识别。曲率模态差是从结构各阶模态振型入手,对结构的振型进行差分得到模态曲率,再通过计算结构损伤前后曲率模态的变化得到。模态柔度差曲率是从结构的柔度矩阵入手,由损伤前后结构的各阶振型和频率共同得到结构柔度矩阵差,再对其对角元素差分得到。上部刚性桁架进行损伤识别时,根据结构损伤前后的模态数据计算绘制曲率模态差和模态柔度差曲率曲线,曲线突变最大处判定为桁架杆件损伤位置。正则化频率变化率是从结构各阶频率入手,计算结构损伤前后的频率变化率并对其正则化得到。由于其仅是损伤位置的函数,与损伤程度无关,因此建立频率指纹库时仅需考虑每个构件的一种损伤工况,减小了样本量。索撑体系进行损伤识别时,首先建立索撑体系频率指纹库,即预先假定各种损伤工况并依据结构理论模型进行有限元分析,计算得到对应的正则化频率变化率,从而建立频率指纹库;再由实测得到的结构固有频率,计算某工况下的正则化频率变化率指标,与频率指纹库进行对比,两者最接近处判定为索撑体系损伤位置。采用张弦桁架的组合损伤识别方法分析试验数据,结果表明:1)基于前三阶频率的正则化频率变化率指标可以有效识别索撑体系的损伤。但由于索撑单元均具有对称性,因此正则化频率变化率指标无法判断对称单元的损伤情况,需要进一步验证。2)曲率模态差法和模态柔度差曲率法均能够较好地识别上部刚性桁架结构的单损伤和多损伤,但其对不同位置杆件的损伤识别效果略有不同。由于下弦杆直接与撑杆相连,受撑杆影响较上弦杆大,因此曲率模态差法和模态柔度差曲率法对上弦杆的识别效果优于下弦杆。3)曲率模态差法和模态柔度差曲率法均可以通过曲线定性判断上部刚性桁架杆件的损伤程度,损伤程度越大,曲线突变程度也越大。另外,越高阶曲线突变程度差距越小,因此应利用低阶模态数据定性判断损伤程度。4)与曲率模态差法相比,模态柔度差曲率曲线在非损伤位置突变小,曲线更稳定,受非损伤位置的干扰较少,识别效果更好。基于越多阶模态数据获得的模态柔度差曲率,其曲线在损伤位置发生的突变越明显,且基于前三阶模态数据得到的模态柔度差曲率完全可以满足损伤识别的精度要求。另外,越高阶振型数据得到的曲率模态差曲线突变越大,但其受干扰也越大,一般运用前两阶曲率模态差曲线可以得到较好的损伤识别效果。针对张弦拱桁架结构基于模态参数的损伤识别方法开展试验研究。设计制作了两榀6m跨度张弦拱桁架试验模型,通过采用不同截面尺寸杆件替换正常杆件的方法来模拟结构损伤,设计了拱桁架杆件损伤、索撑部分损伤的多种损伤工况,通过动力检测获取试验各工况前三阶模态参数,采用基于振动模态参数的组合识别方法针对试验结果进行分析:运用曲率模态差法和模态柔度差曲率法诊断上部拱桁架,运用正则化频率变化率法诊断下部索撑体系。损伤识别试验结果表明:曲率模态差法和模态柔度差曲率法对张弦桁架结构单损伤和多损伤的损伤识别效果均较好,对上弦杆的识别效果优于下弦杆;与曲率模态差法相比,模态柔度差曲率法的曲线非损伤位置突变小,干扰项少,识别效果更好;前三阶频率的正则化频率变化率指标可以有效识别索撑体系是否发生损伤,但针对对称位置的损伤定位需进一步验证。

The Meso-inhomogeneous Deformation of Pure Copper under Tension-Compression Cyclic Strain Loading

The investigation based on experiments and crystal plasticity simulation is carried out to undertake research on mesodeformation inhomogeneity of metals under cyclic loading at grain level.Symmetrical tension-compression cycle tests are performed on pure copper specimens to observe the inhomogeneous distribution of slip deformation and its evolution with cycle number.Cyclic hardening process and stable hysteretic behavior of pure copper under cyclic loading are simulated by applying a crystal plasticity constitutive model including nonlinear kinematic hardening associated with the polycrystalline representative volume element(RVE)constructed by Voronoi tessellation.Inhomogeneous deformation processes of materials under six different strain amplitudes are simulated by 1600 cycles,respectively.We discuss the variation law of the inhomogeneous meso-deformation distribution of material with the increase in cycle number,and research the rationality of characterizing the inhomogeneous deformation distribution and variation with the statistical standard deviation of the micro-longitudinal strain or the statistical average of the first principal strain based on the statistical analysis of the inhomogeneous deformation of the polycrystalline RVE model during the cycling process.It is found that these two parameters are related to and approximately inversely proportional to the length of measuring gauge.

Branchiogenic carcinoma in the parotid gland

To the Editor:Branchiogenic carcinoma is a rare condition.When it does occur,it is often misdiagnosed as a metastasis from an unknown primary.Due to the low incidence of this entity of disease,there is always a lack of relevant research data.[1,2]Herein,we report an extremely rare case of branchiogenic carcinoma in the parotid gland to expand the understanding of this disease.

Facile synthesis of ternary AgInS_(2)nanowires and their self-assembly of fingerprint-like nanostructures

Nanowires(NWs)and self-assemble nanostructures made of chalcogenide semiconductor nanocrystals(NCs)are of great interests to the fundamental studies and practical applications.In this study,we reported a seeded-mediated growth of AgInS_(2)NWs and their intriguing self-assembly nanostructures with fingerprint-like shape.The key to the formation and self-assembly of AgInS_(2)NWs was the presence of In-S species that was a type of molecular metal chalcogenide complexes,serving as specific inorganic ligands for the growth of NWs and cross-linker molecules for the self-assembly of fingerprint-like nanostructures.Systematic studies were carried out to investigate the reaction factors,including the thermodynamics,amount and type of In precursors,and 1-dodecanethiol usage,to the success of the desired products.

A Novel Low-cost Hot Rolled High Strength Steel for an Automatic Teller Machine

A novel hot rolled steel LG600A with the tensile strength exceeding 700 MPa was developed for automatic teller machine application. Thelow-cost C-Mn steel was microalloyed with：0.08 mass%- 0.12 mass% Ti rather than noble alloying elements, such as Nb, V, Mo, and Cu, etc. The novel steel had a good surface quality and welding property. After the hot rolled steel coils were leveled, the steel plates, the length of which was even down to 1 500 mm, had an excellent flatness. The effects of hot rolling parameters on mechanical per formance, m icrostructure and recrystallization behavior were studied. The metallurgical concept for the steel production was also discussed. The result shows that decreasing the finish rolling temperature, increasing cooling rate in the first cooling stage and decreasing the cooling rate in the last cooling stage, together with coiling at a modestly high coiling temperature all resulted in the refined grains and TiC precipitates, thereby improving the strength and toughness of this new steel greatly.

Crystal Facet-Dependent Intrinsic Charge Separation on Well-Defined Bi_(4)TaO_(8)Cl Nanoplate for Efficient Photocatalytic Water Oxidation

The development of photocatalysts with wide spectral absorption and high charge separation efficiency has always been a pursued objective for photocatalytic solar energy conversion.Herein,we reported a wide-range visible-light-active Bi_(4)TaO_(8)Cl(BTOC)single crystal nanoplate with dominating{110}and{001}facets for enhancing the intrinsic charge separation efficiency.Insitu selective photodeposition of metals and metal oxides provides evidences of photogenerated electrons and holes spatially separated on{110}and{001}coexposed facets of BTOC,respectively.The intrinsic charge separation efficiency was demonstrated to be closely dependent on the crystal facets,which can be modulated by tuning the coexposed crystal facet ratio.Further surface modification of BTOC with suitable dual cocatalyst Ag and RuOx enables remarkable improvement of charge separation efficiency and photocatalytic water oxidation performance.Investigation by comparison between well-defined BTOC nanoplate and BTOC nanoparticles confirmed the significance of coexposed crystal facets for efficient spatial charge separation and the blocking of reverse reaction from Fe^(2+)to Fe^(3+)ions during water oxidation reaction,indicating that rational modulation of exposed crystal facets is significant for controlling the intrinsic charge separation efficiency on Bi_(4)TaO_(8)Cl photocatalyst for efficient photocatalytic water splitting.