Using computers for the treatment of psychological problems

Approximately two dozen efforts in the published literature to deliver counseling or other psychological intervention services are critically reviewed, and several issues considered basic to significant progress are discussed. Primary attention is given to examining the use of computers in cognitive psychotherapy, games, computer-aided instruction, biofeedback and behavior therapy, and other related approaches to psychotherapy. Evidence presented in this review leads to the conclusion that computers can make meaningful contributions to the treatment of psychological problems. The limited ability of current computer programs to process natural language is highlighted as the most significant impediment to continued progress in this area.     

A mass spectrometric investigation of the thermal oxidative reactivity of ethylene glycol

The thermal oxidative stability of ethylene glycol was investigated over the temperature range of 100–126°C. Aqueous ethylene glycol were heated in sealed tubes in the presence of metallic copper and without metal. Mass spectrometric analysis was used to determine the rates of O₂ consumption and CO₂ evolution during heating. Copper had a catalytic effect of the glycol degradation. It was found that the rate limiting step in the thermal oxidative process was not related to oxygen consumption, suggesting that the rate limiting step involved the formation of a free radical which subsequently reacts with O₂. The evolution of CO₂ continued to occur after total consumption of the O₂. This suggested that the CO₂ is evolved from one of the thermal oxidation products of ethylene glycol.     

Property of Self-Similarity Between Baseband and Modulated Signals

Mobile Networks and Applications - The increment of communication technologies and the development of signal processing require efficient identification techniques for communication...     

梨小食心虫性信息素的简便合成

[目的]以廉价、易得的原料合成梨小食心虫性信息素(Z/E)-12-十四碳烯醇乙酸酯.[结果]以35.9%的总收率合成了梨小食心虫性信息索(Z/E)-12-十四碳烯醇乙酸酯,GC分析结果表明顺反异构体比例为87/13.将所得的顺反异构体混合物在亚硝酸钠和硝酸体系中经构型转化得到顺反比例为23/77的(Z/E)-12-十四碳烯醇乙酸酯,产物结构经IR、1H NMR等方法确证.[结论]该路线简洁且比大多数文献报道的方法产率略高,值得借鉴.     

3D-printed strontium-doped BG-CaSiO3-HA composite scaffolds promote critical bone defect repair by improving mechanical strength and increasing osteogenic activity

The release of silicon and calcium elements contained in silicon-based materials promotes the formation of bone. For bioactive glass prepared by the sol-gel method, water-soluble binders are usually added when preparing 3D printed scaffolds. However, the obtained scaffolds are prone to collapse when exposed to water and have low strength. At the same time, the binder needs to be removed for clinical applications, so the 3D printed scaffolds need to be sintered. Under high temperature, bioactive glass scaffolds will be transformed into composite scaffolds composed of bioglass, CaSiO₃ and hydroxyapatite, while different sintering temperatures will form different crystal types of CaSiO₃. In this study, SrBG-βCS-HA and BG-βCS-HA were obtained at a heating rate of 5 °C/min to 1100 °C and at the same rate to room temperature. SrBG-αCS-HA and BG-αCS-HA were obtained at a heating rate of 2 °C/min to 1200 °C and at the same rate to room temperature. In vitro and in vivo experiments verified that the presence of strontium in the obtained scaffolds after sintering further enhanced the osteogenic properties of the scaffolds. SrBG-αCaSiO₃-HA and SrBG-βCaSiO₃-HA were found to have relatively better osteogenic properties. The results show that SrBG-CaSiO₃-HA 3D printing scaffolds have excellent clinical application potential.     

7-甲基-3-巯基吡唑[4,3-e]并-1,3,4-噁二嗪衍生物的合成

合成了6种新的嘌呤类似物标题化合物,通过元素分析、IR、1HNMR和质谱分析确定了其结构。     

含N、K的羧甲基纤维素类吸水剂的制备及性能研究

以过硫酸钾为引发剂,以N,N-亚甲基双丙烯酰胺为交联剂,用羧甲基纤维素与丙烯酸、丙烯酸钠、丙烯酸钾进行自由基接枝共聚,再以氨水中和所得接枝共聚物,制备了不同含氮量的吸水树脂。研究了原料配比及氨水中和度对吸水率的影响。结果表明:在羧甲基纤维素:丙烯酸=1:10,交联剂:引发剂:羧甲基纤维素=1:3:200的条件下,聚合物的吸水性能随体系中丙烯酸中和度的提高而变强;用氨水中和制得的聚合物的吸水性能以中和度为80%时最强,吸去离子水可达563.5g/g、自来水232.5g/g、0.9%的生理盐水100.5g/g、人工尿54.5 g/g,具有相当好的耐盐性和实用性。     

氧化钛纳米管阵列热驱动掺银及其生物活性和抗菌性研究

通过在纯钛表面制备得到氧化钛纳米管阵列后,再利用热驱动掺银技术,成功制备得到既具有生物活性,又具有抗菌性能的银掺杂氧化钛纳米管阵列。研究表明氧化钛纳米管阵列热驱动掺银的机理为硝酸银在受限反应空间中的低温分解及其与氧化钛低温相变的协同。将氧化钛纳米管阵列浸泡饱和硝酸银后,在300℃条件下热处理,不仅能实现氧化钛纳米管阵列由无定型转变为金红石型的低温相变,还能同时实现硝酸银的低温分解。     

7-取代喹唑啉酮共振异构化的量子化学计算

采用量子化学中的密度泛函理论方法(DFT),在B3LYP/6-31G*水平和标准状况(298.15K,101.325kPa)下分别计算了7-取代喹唑啉酮和其异构体的热化学参数(Hθ,Gθ).频率计算表明,优化的结构均为稳定的构型;热化学方程计算结果说明,通常情况下该类化合物均以7-取代喹唑啉酮的形式存在.