微波场作用下La_2O_2S∶Tb绿色荧光粉的快速合成及其发光特性

采用微波法快速合成了La2O2S：Tb绿色荧光粉。用X射线粉末衍射（XRD）、扫描电镜（SEM）、荧光分光光度计等对合成产物的结构、形貌以及发光特性进行了研究。结果表明，材料的晶体结构为六方晶系，与La2O2S的相同。颗粒的形貌多为六边形，分散性很好，尺寸在2μm左右。发射光谱由498nm、547nm、590nm、624nm等一系列窄带发射峰组成，归属于Tb^3＋从^5D4到^7FJ（J=0～6）的跃迁。主发射峰位于547nm，对应于^5D4→^7F5的能级跃迁，导致一种绿光发射。研究发现Tb的掺杂浓度对样品主发射峰的发光强度有着很重要的影响，在7％（摩尔分数）时达到最大，继续增加Tb的浓度，发光强度反而降低。

助熔剂法合成Gd_2O_2S∶Tb荧光粉

采用共沉淀法制备前驱体,再加入助熔剂煅烧合成Gd2O2S∶Tb荧光粉,并对制备的荧光粉样品的晶体结构及发光性能进行了系统研究。结果表明:助熔剂的选择对Gd2O2S∶Tb荧光粉合成影响显著;当L i2CO3与L i3PO4添加量的摩尔比为2∶1时发光亮度最大,且颗粒分布较均匀;当助熔剂的质量分数为0.35时发光性能最好。

微波场作用下Y_2O_2S:Tb绿色荧光粉的快速合成及其发光特性

采用微波法快速合成了Y2O2S：Tb绿色荧光粉。用X射线衍射（XRD）仪、扫描电镜（SEM）、荧光分光光度计等对合成产物的相结构、形貌、以及发光特性进行了研究。结果表明：材料的晶体结构为六方晶系，与Y2O2S相同。颗粒的形貌为类球形，分散性很好，平均晶粒尺寸在300nm左右。发射光谱由384，418，439，460，475，498，547，590，624nm等一系列窄带发射峰组成，归属于Tb^3＋从^5D3，^5D4到^7FJ（J=0～6）的跃迁。研究发现Tb的掺杂浓度对样品的发射光谱有着很重要的影响，当其浓度为0．5％（摩尔分数，下同）时，^5D3→^7FJ的蓝光发射发生猝灭，当其浓度为9％时，^5D4→^7FJ的绿光发射发生猝灭。

Y_2O_2S∶Tb纳米晶的能量传递过程的研究

研究了Y2O2S∶Tb纳米晶的发光性质和能量传递过程,根据浓度猝灭曲线分析了纳米Y2O2S中引起5D3和5D4能级浓度猝灭的相互作用类型分别为电偶极-电偶极和交换相互作用。纳米Y2O2S中Tb离子的5D3-7F5跃迁的发光寿命与相同掺杂浓度的体材料相比明显缩短,根据引起浓度猝灭的相互作用类型对发光衰减曲线进行拟合,得到理论和试验一致的结果。

ZnO掺杂对Gd_2O_2S∶Tb晶体结构及发光性能的影响

采用共沉淀法制备前驱体,通过固相反应制备了Gd2O2S∶Tb荧光粉。结果表明,采用氧化锌的掺杂,提高了荧光体的发光性能。选择合适的Zn2+浓度,可以通过控制焙烧条件,控制其粒径分布,使晶型趋于完整;通过对XRD和光谱的分析,可以清楚看出ZnO的添加,并未产生新相,而是使晶胞变小,使Gd3+与Tb3+以及Tb3+之间更容易发生能量传递,增强Tb3+离子的自敏化作用,加强5D4—7Fj发射,猝灭5D3—7Fj的发射,在提高发光亮度的同时,提高了荧光粉的色纯度。

微波场作用下Gd2O2S：Tb绿色荧光粉的快速合成及其发光特性

首次采用微波法，快速合成了Gd2O2S：Tb绿色荧光粉，用X射线粉末衍射（XgD）、扫描电镜（SEM）、荧光分光光度计等对合成产物的结构、形貌、以及发光特性进行了研究。结果表明，材料的晶体结构为六方晶系，与Gd2O2S的相同,颗粒的形貌为类球形，分散性很好，尺寸在1μm左右,Gd2O2S：Tb的激发光谱呈带状，主峰位于298nm,发射光谱由384、418、439、471、498、547、590、624nm的一系列窄带发射峰组成，归属于Tb^3＋从^5D4、^5D3能级到^7FJ（J=0-6）的跃迁。主发射峰位于547nm，对应于^5D4→^7F5的能级跃迁，导致一种绿光发射,研究发现Tb的掺杂浓度对样品主发射峰的强度有着很重要的影响，在5％（摩尔分数）时达到最大，继续增加Tb的浓度，出现浓度猝灭现象，同时对浓度猝灭的机理进行了探讨。

掺杂离子对白色长余辉发光材料Y_2O_2S：Tb^3＋,Eu^3＋,M^2＋(M=Mg,Ca,Sr,Ba),Zr^4＋性能的影响

采用高温固相法制备了白色长余辉发光材料Y2O2S∶Tb3+,Eu3+,M2+(M=Mg,Ca,Sr,Ba),Zr4+,利用X晶体衍射、发光光谱、余辉曲线和热释光曲线等对制备的材料进行表征。结果表明:掺杂离子没有改变样品晶体结构和发射峰的位置,但对其发光强度、余辉时间及陷阱深度有较大的影响。在263 nm紫外光的激发下,469 nm和626 nm的发射分别对应于Eu3+的5D2→7F0、5D0→7F2跃迁,544 nm的发射对应于Tb3+的5D4→7F5跃迁,主要通过它们的混合产生白光。掺杂不同二价离子样品的余辉性能按Mg2+、Sr2+、Ca2+、Ba2+的顺序递减,其中掺杂Mg2+的样品,色度坐标为(0.29,0.32),陷阱深度为1.17 eV,余辉时间长达320 s(≥1 mcd/m2),表现出最佳的发光性能。

Tb/s光纤通信传输系统的开发现状及关键技术

随着通信需求的急速增长,光纤通信系统的传输速率日益提高,Tb/s 的单纤容量成为当前研究开发的重点。本文介绍了国际上Tb/s 系统的进展情况。

防抱制动系统Tb-S收敛特性及其对道路交通事故的影响

对汽车防抱制动系统中制动力矩Ｔｂ与车轮滑移率Ｓ的收敛特性和收敛区域进行探讨，指出该收敛区域恰与制动稳定区重合，从而可使车辆的制动性能得到极大的改善。同时，还进行了防抱制动系统对道路交通事故影响的分析与研究。

Tb/s单信道正交ASK/DQPSK光标记交换系统设计

随着光信道传输速率要求的不断增长,光标记交换(OLS)技术已成为目前光传输网中最具研究潜力的光交换技术,现阶段光标记交换系统中的单信道传输速率都在Gb/s量级上。为此,提出将正交调制光标记交换系统与光时分复用(OTDM)系统相结合,实现了一种Tb/s单信道的正交ASK/DQPSK光标记交换系统,并对系统进行了仿真实验,验证了系统的可行性。

Gd_(2)O_(2)S:Tb闪烁陶瓷的制备与结构:水浴合成中H_(2)SO_(4)/Gd_(2)O_(3)摩尔比的影响

Gd_(2)O_(2)S:Tb闪烁陶瓷以其明亮的绿色发光、高能量转换效率和高中子俘获截面而广泛应用于中子成像和工业无损检测等领域,但Gd_(2)O_(2)S:Tb陶瓷中存在的Gd_(2)O_(3)第二相影响其闪烁性能。本工作以H_(2)SO_(4)和Gd_(2)O_(3)为原料,采用水浴法合成Gd_(2)O_(2)S:Tb前驱体,研究了H_(2)SO_(4)与Gd_(2)O_(3)的摩尔比(n)对前驱体和Gd_(2)O_(2)S:Tb粉体性能的影响。前驱体的化学组成随n增大而变化:2Gd_(2)O_(3)·Gd_(2)(SO_(4))_(3)·xH_(2)O(n<2.00)、Gd_(2)O_(3)·2Gd_(2)(SO_(4))_(3)·xH_(2)O(2.25≤n≤2.75)和Gd_(2)(SO_(4))_(3)·8H_(2)O(n=3.00),经过空气煅烧和氢气还原后,所有的粉体均形成Gd_(2)O_(2)S相。Gd_(2)O_(2)S:Tb粉体的形貌与前驱体的相组成密切相关,随着n增大,Gd_(2)O_(2)S:Tb粉体的XEL强度增加呈现出两个阶段,对应前驱体的相转变阶段。采用真空预烧结合热等静压烧结制备了Gd_(2)O_(2)S:Tb陶瓷,相较于n为2.00、2.25、2.50,其他n制备的Gd_(2)O_(2)S:Tb陶瓷都达到了较高的相对密度和XEL强度,不同n制备的陶瓷中都存在Gd_(2)O_(3)第二相,n增大有利于减少陶瓷内部的第二相,为进一步消除Gd_(2)O_(2)S:Tb陶瓷中的第二相提供了思路。

“加热”一下：让硬盘提速1TB／s

机械硬盘借助外部磁场翻转磁极方向，就能存储、改变数据。现在，英国约克大学的一个研究小组发现，短暂、突发的热能可以让硬盘在一秒钟的时间内读写1TB数据，比现在的水平高出数百倍，而且所用的能量也比磁性存储机制要少得多，意味着新硬盘可以更高效、更节能。

TB-S松散回潮机的设备结构及控制原理

主要介绍TB-S松散回潮机的设备结构、控制系统及运行状态。TB-S松散回潮机由滚筒、加水系统、蒸汽施加系统、热风系统、新风系统、排潮系统、清洗系统等组成;当松散回潮机前的电子秤检测到物料流量大于200 kg/h时,延时20秒后转为生产状态;清洗10分钟结束,系统停机。

基于TB6560HQ的步进电机控制研究

用TB6560HQ控制步进电机,实现步距角细分和各种工作状态的选择,并给出了其控制系统的软硬件设计方法。

Y_2O_2S:Sm,Tb中Tb^(3+)使Sm^(3+)发光增强的机理

在研究Y2O2S:Tb,Sm磷光体过程中,我们发现,在阴极射线（简写为CR）或紫外光254nm（简写为UV254）激发下,Tb3+对Sm3+的发光有明显的增强作用。Shrader和Yocom曾报导过在CR激发下的这种增强现象,但没有详细地研究过,只是认为可能与Eu3+,Sm3+和Yb3+客易还原成二价,Tb3+容易氧化成Tb4+有关。最近,Yamamoto等人在研究Tb3+对Eu3+和其它三价希士离子的敏化时,认为与样品充电效应无关并简要地提出一种假设。

Association of TNF-α-238G/A and 308 G/A Gene Polymorphisms with Pulmonary Tuberculosis among Patients with Coal Worker’s Pneumoconiosis

Objectives Tumor necrosis factor-α （TNF-α） may play an important role in host＇s immune response to mycobacterium tuberculosis （M. tuberculosis） infection. This study was to investigate the association of TNF-α gene polymorphism with pulmonary tuberculosis （TB） among patients with coal worker＇s pneumoconiosis （CWP）. Methods A case-control study was conducted in 113 patients with confirmed CWP complicated with pulmonary TB and 113 non-TB controls with CWP. They were matched in gender, age, job, and stage of pneumoconiosis. All participants were interviewed with questionnaires and their blood specimens were collected for genetic determination with informed consent. The TNF-α gene polymorphism was determined with polymerase chain reaction of restriction fragment length polymorphism （PCR-RFLP）. Frequency of genotypes was assessed for Hardy-Weinberg equilibrium by chi-square test or Fisher＇s exact probability. Factors influencing the association of individual susceptibility with pulmonary TB were evaluated with logistic regression analysis. Gene-environment interaction was evaluated by a multiplieative model with combined OR. All data were analyzed using SAS version 8.2 software. Results No significant difference in frequency of the TNF-α-308 genotype was found between CWP complicated with pulmonary TB and non-TB controls （2,2=5.44, P=-0.07）. But difference in frequency of the TNF-α-308 A allele was identified between them （2,2-5.14, P=0.02）. No significant difference in frequencies of the TNF-α-238 genotype and allele （P=0.23 and P=0.09, respectively） was found between cases and controls either, with combined （GG and AA） OR of 3.96 （95% confidence interval of 1.30-12.09） at the -308 locus of the TNF-α gene, as compared to combination of the TNF-α-238 GG and TNF-α-308 GG genotypes. Multivariate-adjusted odds ratio of the TNF-α-238 GG and TNF-α-308 GA genotypes was 1.98 （95% CI of 1.06-3.71） for risk for pulmonary TB in patients with CWP. There was a synergic interaction between the TNF-a-308 GG genotype and body mass index （OR=4.92）, as well as an interaction between the TNF-α-308 GG genotype and history of BCG immunization or history of TB exposure. And, the interaction of the TNF-α-238 GG genotype and history of BCG immunization or TB exposure with risk for pulmonary TB in them was also indicated. Conclusions TNF-α-308 A allele is associated with an elevated risk for pulmonary TB, whereas TNF-α-238 A allele was otherwise.

Extra-Pulmonary Pott’s Disease with Intracranial Manifestations: An Inmate’s Story

Tuberculosis is a chronic disease that is the leading cause of infectious disease deaths worldwide. In developed countries, incidences are minimal and however, complicated manifestations of tuberculosis are becoming a trend within the prison system. This case report illustrates a patient within the United States correctional system who demonstrated a rare infection of tuberculosis despite absent pulmonary findings. Our Patient was a 39-year-old inmate presenting with fatigue, night sweats, weight loss, and progressive dyspnea. Pulmonary imaging and cultures of sputum were negative for tuberculosis. Further imaging and laboratory workups demonstrated extensive spinal infections along with intracranial lesions that were positive for tuberculosis. Neurosurgery declined operative medicine due to advancement of the disease and appropriate antibiotic therapy was immediately initiated. Tuberculosis continues to exist in developed countries with an increased emergence of complicated cases. Furthermore, incarceration dramatically increases an individual’s risk of worse infections. The clinical impact involves promoting awareness for a need to identify and prevent continued spread of disseminated infections. Therefore, further investigations of this trend in prisons are worth considering.

TB系列新型上销与成纱质量

针对传统金属上销和非金属上销存在的缺点,在对高聚物直板上销研究的基础上成功开发出前区曲线牵伸上销TB6939S。其应用效果主要有2个方面:①上销前缘通过胶圈对纤维的下压作用,加强对浮游纤维的控制;②缩短浮游区至6mm,使其不提早变速,有利于改善条干均匀度。TB系列上销钳口部位的独特设计,真正做到对纱条先握持后牵伸,使成纱质量明显提高,并较好地解决了上胶圈打顿和滑溜问题,重新分布摩擦力界,成纱条干CV值降低,三节、结减少。

First Use of Bedaquiline in Democratic Republic of Congo: Two Case Series of Pre Extensively Drug Resistant Tuberculosis

In this manuscript the authors have studied the first two patients who were successfully treated with the treatment regimen containing Bedaquiline as second-line drug. The patients were diagnosed with pre-extensively drug-resistant tuberculosis (preXDR TB) whose prognosis was fatal in Democratic Republic of Congo (DRC). Bedaquiline is arguably one of the molecules of the future in the management of ultra-resistant tuberculosis. However, a larger cohort study may help to establish its effectiveness. Case report: Patients 1, 29 years old, with a history of multidrug-resistant TB (MDR-TB) one year previously. He showed signs of TB impregnation again 6 months after the last treatment. Bascilloscopy was positive again. The pre-extensively tuberculosis (pre-XDR TB) diagnosis was made by the Hain test (GenoType&reg;MTBDRsl, Hain Lifescience). Patient 2, brother of the first patient, with a history of MDR TB a year before. He had low back pain with right parietal dorso swelling four months after the last treatment. The x-ray of the column showed L4-L5 disc disease. Parietal ultrasound showed a parietal abscess to the right of thoracic vertebrae with fistulization. Surgical biopsy and pus culture confirmed the diagnosis of Pre-XDR Extrapulmonary TB. The treatment regimen was the same for both patients: 6 months with Amikacin (Am) Bedaquiline (Bdq) Prothionamide (Pto) Paraamino Salicylic acid (PAS) Linezolid (Lzd) Cycloserine (Cs) Pyrazinamide (Z) and 14 months with PAS Lzd Cs Z. The side effects were minor. Bacteriological controls (smears and cultures) after 20 months of treatment are negative to date.