新老混凝土粘结复合受力的强度特性

选取立方体和Z形试件作为新老混凝土粘结试件 ,在多功能三轴试验系统上对百余块粘结试件的复合受力性能进行试验研究。考察粘结面粗糙度、新混凝土强度、拉 (压 )应力对粘结强度的影响规律 ,探索新老混凝土粘结复合受力的强度特性。     

Depleted parental psychological resources as mediators of the association of income with adherence and metabolic control.

For adolescents with Type 1 diabetes, lower family income may be associated with poorer diabetes management through depleted parental psychological resources (i.e., higher parental depressive symptoms, lower parental acceptance). Adolescents (N = 252; 46% male) aged 10–14 years with Type 1 diabetes assessed the acceptance of their mother and father (e.g., “gives me the feeling that she likes me as I am”; “she doesn't feel she has to make me over into someone else”). Mothers provided information on family income and demographics. Both mothers and fathers reported their depressive symptoms. HbA1c scores were indexed via medical records. Lower family income was associated with higher (i.e., worse) HbA1c, more mother and father depressive symptoms, and less acceptance from both parents. Mediation analyses revealed that the relationship of lower family income with metabolic control occurred indirectly through lower maternal and paternal acceptance and lower adherence. Lower family income may impair the quality of parent—adolescent relationships that are beneficial for good diabetes management. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

一次搪耐酸搪瓷界面过渡层结构研究

采用合理配方设计,使用一次涂搪工艺,制备出了同时具有优良密着性能和耐酸性能的搪瓷板。采用扫描电子显微镜和能谱仪对一次搪耐酸搪瓷板界面显微结构和元素进行分析,研究结果表明,密着性能优良的一次搪耐酸搪瓷界面呈现咬合齿轮状,元素分析表明瓷层元素和金属元素相互扩散,相互渗透,在性能上表现为密着强度优良。     

A randomized controlled trial of cognitive behavioral therapy for adherence and depression (CBT-AD) in HIV-infected individuals.

Objective: To evaluate cognitive-behavioral therapy to enhance medication adherence and reduce depression (CBT-AD) in individuals with HIV. Design: A two arm, randomized, controlled, cross-over trial comparing CBT-AD to enhanced treatment as usual only (ETAU). ETAU, which both groups received, included a single-session intervention for adherence and a letter to the patient's provider documenting her or his continued depression. The intervention group also received 10 to 12 sessions of CBT-AD. Main Outcome Measures: Adherence to antiretroviral therapy as assessed by Medication Event Monitoring Systems (MEMs) and depression as assessed by blinded structured evaluation. Results: At the acute outcome assessment (3-months), those who received CBT-AD evidenced significantly greater improvements in medication adherence and depression relative to the comparison group. Those who were originally assigned to the comparison group who chose to cross over to CBT-AD showed similar improvements in both depression and adherence outcomes. Treatment gains for those in the intervention group were generally maintained at 6- and 12-month follow-up assessments. By the end of the follow-up period, those originally assigned CBT-AD demonstrated improvements in plasma HIV RNA concentrations, though these differences did not emerge before the cross-over, and hence there were not between-groups differences. Conclusions: CBT-AD is a potentially efficacious approach for individuals with HIV struggling with depression and adherence. Replication and extension in larger efficacy trials are needed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Correction to Erbes, Curry, and Leskela (2009).

Reports an error in Treatment presentation and adherence of Iraq/Afghanistan era veterans in outpatient care for posttraumatic stress disorder by Christopher R. Erbes, Kyle T. Curry and Jennie Leskela (Psychological Services, 2009[Aug], Vol 6[3], 175-183). The copyright for the article was listed incorrectly. This article is in the Public Domain. The online version has been corrected. (The following abstract of the original article appeared in record 2009-12007-001.) The ongoing wars in Afghanistan (Operation Enduring Freedom or OEF) and Iraq (Operation Iraqi Freedom or OIF) make the development and application of effective postdeployment mental health treatment programs a high priority. There has been some concern that existing treatment programs for combat-related posttraumatic stress disorder (PTSD) may not fit well with OEF/OIF veterans confronted with acute mental health difficulties while reestablishing community, familial, and occupational connections after their deployment. This study utilized data gathered from a large outpatient Veterans Affairs Medical Center PTSD treatment clinic to examine differences in initial treatment presentation and treatment adherence (attendance and dropout) between a group of Vietnam era veterans (n = 54) and a group of OEF/OIF veterans (n = 106). OEF/OIF veterans reported lower levels of symptom distress on questionnaires assessing posttraumatic reexperiencing, avoidance, dissociation, and arousal symptoms but similar levels of anger and acting out behaviors and higher levels of alcohol problems. OEF/OIF veterans had significantly lower rates of session attendance and higher rates of treatment dropout than Vietnam veterans, and this difference was not accounted for by differences in treatment presentation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Adherence of elastomers: Fracture mechanics aspects

Application of fracture mechanics concepts to adherence of elastic and viscoelastic solids is examined. It is shown that the Dugdale-Barenblatt model could be applied both for explaining the transition from Johnson-Kendall-Roberts to Deryagin-Muller-Toporov solution in adherence of spheres, and for liquid bridges. The problem of the threshold energy release rate G₀ for elastomers is considered. It is proposed to add to the viscoelastic losses a supplementary friction term when polymeric chains strongly held at the interface by primary bonds are pulled out.     

The effect of thermal annealing on the adherence of Al2O3 films deposited by LP-MOCVD on several high alloy steels

Thin alumina films, deposited at 280°C on several high alloy steels by low-pressure metal-organic chemical vapor deposition (LP-MOCVD), were annealed at 0.17 kPa in a nitrogen atmosphere for 2, 4, and 17 h at 600 and 800°C. Film adhesion was studied by scanning scratch testing (SST) and Auger electron spectroscopy (AES). The best adhesion properties were obtained with commercial oxide dispersion-strengthened (ODS) high-temperature alloys, especially PM 3030. Among the 'normally' high alloy stainless steels, type AISI-321 showed the best adhesion. The other stainless steel-alumina combinations exhibited a reduced critical load, L_c, after thermal treatment. Alumina on ODS alloys exhibited an increased adhesion. AES studies revealed that this increase could be explained by: (1) the presence of sulfur-trapping elements, preventing segregation of sulfur at the interface; and (2) titanium and carbon enrichment at the interface, resulting in an anchoring effect between the oxide and the substrate.     

镍对医用金属材料血小板粘附的影响

通过对血小板粘附的实验,研究了纯镍、镍钛合金、医用316L不锈钢以及无镍奥氏体不锈钢(BIOSSN4)四种金属材料表面上的血小板粘附、变形和聚集情况.结果表明,含镍材料表面上的血小板发生了不同程度的变形和聚集,而无镍不锈钢表面上的血小板形态变化较小.当在无镍奥氏体不锈钢(BIOSSN4)血小板粘附实验中加入不同剂量的镍离子时,材料表面上明显出现血小板的变形和聚集,该实验进一步证明了镍元素在医用金属材料中存在的危害性.     

副干酪乳杆菌M5-L抑制宋内志贺氏菌黏附作用影响因素的研究

研究副干酪乳杆菌M5-L抑制宋内志贺氏菌(S.sonnei)对HT-29细胞黏附的作用及其影响抑制黏附作用的表面分子分析。结果表明M5-L能够显著的抑制S.sonnei的黏附作用,在排除、竞争和取代黏附实验中,抑制率分别为55%、33%和30%,差异显著(p<0.05),高碘酸钠处理后,M5-L的抑制黏附作用没有变化,表明碳水化合物并没有参与到黏附抑制过程中。而经过5mol/L LiCl处理后,M5-L的抑制黏附作用下降,说明S-层蛋白参与了M5-L抑制S.sonnei对HT-29细胞的黏附作用。此外,M5-L的S-层蛋白能够显著抑制S.sonnei的黏附作用。     

PMMA‐multigraft copolymers derived from linseed oil,soybean oil,and linoleic acid: Protein adsorption and bacterial adherence

Synthesis of Poly(methyl methacrylate), PMMA‐multigraft copolymers derived from linseed oil, soybean oil, and linoleic acid PMMA‐g‐polymeric oil/oily acid‐g‐poly(3‐hydroxy alkanoate) (PHA), and their protein adsorption and bacterial adherence have been described. Polymeric oil/oily acid peroxides [polymeric soybean oil peroxide (PSB), polymeric linseed oil peroxide (PLO), and polymeric linoleic acid peroxide (PLina)] initiated the copolymerization of MMA and unsaturated PHA‐soya to yield PMMA–PLO–PHA, PMMA–PSB–PHA, and PMMA–PLina–PHA multigraft copolymers. PMMA–PLina–PHA multigraft copolymers were completely soluble while PMMA–PSB–PHA and PMMA–PLO–PHA multigraft copolymers were partially crosslinked. Crosslinked parts of the PLO‐ and PSB‐multigraft copolymers were isolated by the sol gel analysis and characterized by swelling measurements in CHCl₃. Soluble part of the PLO‐ and PSB‐multigraft copolymers and completely soluble PLina‐multigraft copolymers were obtained and characterized by spectroscopic, thermal, gel permeation chromatography (GPC), and scanning electron microscopy (SEM) techniques. In the mechanical properties of the PHA–PLina–PMMA, the elongation at break is reduced up to ～ 9%, more or less preserving the high stress values at its break point (48%) when compared to PLina‐g‐PMMA. The solvent casting film surfaces were studied by means of adsorption of blood proteins and bacterial adhesion. Insertion of the PHA into the multigraft copolymers caused the dramatic increase in bacterial adhesion on the polymer surfaces. PHA insertion into the graft copolymers also increased the protein adsorption. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007