Equal-Material Manufacturing of a Thermoplastic Melt-Cast Explosive Using Thermal-Pressure Coupling Solidification Treatment Technology.

To eliminate internal defects of grains developed during melt-cast charging, the formation mechanism and the trend of crystal morphology of internal defects of 2,4,6-trinitrotoluene and 2,4-dinitroanisole-based melt-cast explosives under different process conditions were simulated. The effects of solidification treatment on melt-cast explosive molding quality were investigated by combining pressurized feeding, head insulation, and water bath cooling. The single pressurized treatment technology results showed that grains were exposed to layer-by-layer solidification from outside to inside, resulting in V-shaped shrink areas of the contract cavity in the core. The defect area was proportional to the treatment temperature. However, the combination of treatment technologies, such as head insulation and water bath cooling, promoted longitudinal gradient solidification of the explosive and controllable migration of its internal defects. Moreover, the combined treatment technologies effectively improved the heat transfer efficiency of the explosive with the help of a water bath to reduce the solidification time, thus achieving highly efficient equal-material manufacturing of microdefect or zero-defect grains.

The direct and indirect effect of event severity, social support, and optimism on stress-related growth in emerging adults.

Stress-related growth (SRG) can be understood as stressful experiences that act as catalysts for positive life changes. Although less severe than typical 'trauma,' some daily obstacles may nevertheless derail faith and intentions, produce distress, result in a demand for reflection, and provide a possibility for SRG. This study examined the direct and indirect effects of event severity, social support, and optimism on SRG among emerging adults attending college in China. A convenience sample of 365 college students, ranging from 18 to 24 years old, completed surveys on event severity, social support, optimism, and SRG. We applied structural equation modeling and bootstrapping to explore optimism in the mediation model. Results demonstrated that event severity and social support have direct and indirect effects on SRG through a partial mediation effect of optimism. The results indicate that interventions targeting optimism might be an effective approach to improving SRG among college students in China.

Psychometric properties of the Chinese version of the Stress-Related Growth Scale: Short Form in undergraduate nursing students.

In this study, we examined the psychometric properties of the Chinese version of the Stress-Related Growth Scale-Short Form (SRGS-SF) for undergraduate nursing students. Using a cross-sectional design, a convenience sample of 253 undergraduate nursing students was included in this study. Half of the sample (n = 126) was randomly selected to explore the factorial structure of the SRGS-SF via exploratory factor analysis. The rest of the sample (n = 127) was selected to confirm the structure via confirmatory factor analysis. The results showed that the Chinese version of the SRGS-SF consisted of two factors: interpersonal and intrapersonal growth. The scale also had the power to discriminate between undergraduate nursing students with high and low levels of stress-related growth (SRG). The internal consistency and stability of the scale were also adequate. The Chinese version of the SRGS-SF is a valid and reliable measurement for assessing SRG among undergraduate nursing students. One suitable application would be the evaluation of the process underpinning SRG and the effectiveness of interventions.

Assessment and Predictors of Grief Reactions among Bereaved Chinese Adults.

BACKGROUND: The Texas Revised Inventory of Grief-Present Scale (TRIG-Present) is a widely used tool to measure grief. Most existing research related to the assessment and characteristics of grief has been conducted sampling bereaved Western subjects and, as such, limited information is available on the experience of grief in Chinese samples. OBJECTIVE: This study aims to validate the Chinese version of the TRIG-Present (TRIG-Present-C) and explore the predictors of grief among bereaved adults in China. METHODS: Responses from 460 bereaved Chinese adults were collected through an online survey. Subjects completed a specially developed questionnaire covering demographic data/loss-related variables, the TRIG-Present-C, and Center for Epidemiologic Studies Depression Scale (CES-D-9). RESULTS: Confirmatory factor analysis validates the original one-factor structure. The overall content validity index is equal to 1.0. Significant correlations were observed, with CES-D-9 and factor subscales (r ranged from -0.228 to 0.607, p < 0.05) indicating the convergent validity. The TRIG-Present-C scores distinguished grieving individuals from those experiencing unanticipated death and those where death was anticipated. The internal consistency is satisfactory (Cronbach's α = 0.957). In multiple regression analyses, with grief severity as the dependent variable, 28.6% of the variance was explained by religious belief, the immediacy of the loss, the loss of a first-degree relative, and where the deceased was relatively young. CONCLUSIONS: The TRIG-Present-C scale is a reliable and valid instrument for assessing grief reaction among bereaved Chinese adults. Religious belief, loss of a first-degree relative, where the deceased was relatively young, and the immediacy of loss were associated with higher levels of grief.

The Chinese version of Instrument of Professional Attitude for Student Nurses (IPASN): Assessment of reliability and validity.

BACKGROUND: Professional attitude is of great importance for nursing talents in the modern society. To develop an effective educational program for student nurses in China, an appropriate instrument is required for the assessment of their professional attitude. OBJECTIVE: To assess the validity and reliability of the Instrument of Professional Attitude for Student Nurses (IPASN) in Chinese version. METHODS: The original version of IPASN was translated through Brislin model (translation, back translation, culture adaption and pilot study) with the authorization from the developer. A total of 681 nursing students were chosen by stratified convenience sampling to assess construct validity using exploratory factor analysis (EFA). Besides, item analysis, Cronbach's alpha coefficients, test-retest reliability were conducted to test the psychometric properties in this part. A total of 204 nursing undergraduate trainees were selected by cluster convenience sampling to confirm the structure using confirmatory factor analysis (CFA) in another time. RESULTS: Corrected item-total correlations, alpha if item deleted were between 0.33 and 0.69, 0.906 and 0.913, respectively, indicating no item should be deleted. Cronbach alpha value was 0.91 for the total scale and Cronbach alpha coefficient for subscales ranged from 0.67 to 0.89. Test-retest reliability estimated from intraclass correlation coefficient (ICC) was 0.74 (P<0.05). Differences in item scores between the high-score group (the first 27%) and low-score group (the last 27%) were significant (P<0.001), indicating that the item discrimination ability was good. Seven subscales (contribution to increase of scientific information load, autonomy, community service, continuous education, to promote professional development, cooperation and theory guiding practice) were identified in EFA and confirmed in CFA, and explained 65.5% of the total variance. CONCLUSION: It indicated that the Chinese version of IPASN was valid and reliable for the evaluation of nursing students' professional attitude.

[Macroscopic and microscopic identification of Mongolian medicine Potentilla glabra].

OBJECTIVE: To provide the identification basis for Mongolian medicine Potentilla glabra. METHODS: Macroscopic and microscopic identification were applied to observe macroscopic, histological, superficial, and powder characteristics of its stems and leaves. RESULTS: The following characteristics were observed: The cork layer sandwiched with sclerenchyma ring which was main composed of fibers, accompanied by stone cells and large cell layer; Catheter with fiber existed in xylem; Beaded thickened anticlinal wall in leaf epidermal cell; Stomatal infinitive; Small clusters of calcium oxalate crystal and different type of leaf transverse section. CONCLUSION: These characteristics can provide evidences for the identification and quality control of Potentilla glabra.