Multireference configuration interaction potential curve and analytical potential energy function of the ground and low-lying excited states of CdSe

The potential energy curves （PECs） of the ground state （^3∏） and three low-lying excited states （^1∑, ^3∑,^1∏） of CdSe dimer have been studied by employing quasirelativistic effective core potentials on the basis of the complete active space self-consistent field method followed by multireference configuration interaction calculation. The four PECs are fitted to analytical potential energy functions using the Murrel-Sorbie potential function. Based on the PECs, the vibrational levels of the four states are determined by solving the Schrodinger equation of nuclear motion, and corresponding spectroscopic constants are accurately calculated. The equilibrium positions as well as the spectroscopic constants and the vibrational levels are reported. By our analysis, the ^3∏ state, of which the dissociation asymptote is Cd（^1S） ＋ Se（^3p）, is identified as a ground state of CdSe dimer, and the corresponding dissociation energy is estimated to be 0.39eV. However, the first excited state is only 1132.49cm^-1 above the ground state and the ^3∑ state is the highest in the four calculated states.

New CFAR target detector for SAR images based on kernel density estimation and mean square error distance

A new constant false alarm rate （CFAR） target detector for synthetic aperture radar （SAR） images is developed. For each pixel under test, both the local probability density function （PDF） of the pixel and the clutter PDF in the reference window are estimated by the non-parametric density estimation. The target detector is defined as the mean square error （MSE） distance between the two PDFs. The CFAR detection in SAR images having multiplicative noise is achieved by adaptive kernel bandwidth proportional to the clutter level. In addition, for obtaining a threshold with respect to a given probability of false alarm （PFA）, an unsupervised null distribution fitting method with outlier rejection is proposed. The effectiveness of the proposed target detector is demonstrated by the experiment result using the RADATSAT-2 SAR image.

Comparison of plastic and self-expandable metal stents in the palliative treatment of malignant biliary obstruction: a meta-analysis

Objective： Stent placement is one of the main methods in the palliative treatment of malignant biliary obstruc- tion, including plastic and self-expandable metal stents. The comparison of stent patency between self-expandable metal and plastic stents in palliation of malignant biliary obstruction is meaningful. We carried out a meta-analysis to summarize current evidence for clinical efficacy of self-expandable metal and plastic stents in the treatment of malignant biliary obstruc- tion. Methods： A comprehensive search of several databases including CNKI, Wanfang Data, Sino MED. A fixed-effects or random-effects model was used to pool data of aU study endpoint. Sensitivity analysis was also performed. Results： Eight randomized clinical trials were identified, including 633 patients. These results suggested that the self-expandable metal stents were associated with a significantly longer stent patency （OR = 8.15; 95% CI： 2.80-23.76; 12 = 85%）. No publication bias was observed. Conclusion： Self-expanding metal stents have a longer patency than plastic stents and offer adequate palliation in patients with malignant bUiary obstruction.

STENT TREATMENT FOR COMPLICATED CORONARY ABTERIOLESIONS

41 cases of corouary artarioleaion admitted duringDeceuber,1995-Dacember 1997 were treated with otent andanalyzed of which 40 cases,36 hale and 4 fanalesuffered from complicated coronary arterioloaion.Stable angina pectoile 11 cues,unstable anginapactoriar 11 cases,cardiac infarction:10 casesSingle vasoleaion: 13 cases,double:21 cases,triple:6 cases Forty-two atants ware implanted in fortytwo lesioned vessals Vasolasion olassification inaccordance With ACC/AHA acors:Type Bl 4 locationa B2locations,C 16 locations.Clinical rate.of auccsasvithout complications was reach in 38 cases(95%)and two failed. Moan residuo atanonin rated -1.8%Follow-up visits aftar two years found no death oroccurrence of cardiac infarction 22 cases were raliovedcoapletely of thair angina pactoris and 17 casesware relived to diffarant degrese,and only onecase with his angina pactoris aggravated a Follow-upfour cases found none half aftar PTCA restanceierated 20%. The obtained ranults auggect that atenttreatmant is satisfactory for treating conplicatedcoronary artary dissases.

A retrospective analysis of carbapenem-resistant Acinetobacter baumannii infections in critically ill patients:Experience at a tertiary-care teaching hospital ICU

Background Acinetobacter baumannii is a clinically significant pathogen with a high incidence of multidrug resistance that is associated with life-threatening nosocomial infections.Here,we aimed to provide an insight into the clinical characteristics and outcomes of a unique group of A.baumannii infections in which the isolates were resistant to carbapenems and most other antibiotic groups in a tertiary-care intensive care unit(ICU).Methods We performed a retrospective observational study in which records of patients hospitalized in the ICU between June 1,2021 and June 1,2023 were reviewed.We checked the clinical,laboratory,and microbiological records of all adult patients who had carbapenem-resistant A.baumannii(CRAB)infections.Prior antibiotic treatments and definitive antibiotic treatments after culture positivity and susceptibility test results were recorded.C-reactive protein(CRP)and procalcitonin levels and leukocyte counts were noted.Length of ICU stay and 30-day mortality were defined as the outcome parameters.Results During the study period,57 patients were diagnosed with CRAB infections.The respiratory tract was the leading infection site(80.7%).In non-survivors,bloodstream infections(21.9%vs.4.0%P=0.05)and colistin-resistant(col-R)CRAB infections(43.8%vs.24.0%,P=0.12)were more common than in survivors,but these parameters were not statistically significant.The length of ICU stay was not different between survivors and non-survivors.Overall,the rate of col-R among CRAB clinical isolates was 35.1%.The 30-day mortality in all patients with CRAB infection was 56.1%.Mortality in col-R CRAB and colistin-susceptible(col-S)CRAB infections was 70.0%and 48.6%,respectively(P=0.12).Prior carbapenem use was 56.1%.Prior colistin use before col-R and col-S CRAB infections was not significant(35.0%vs.27.0%,P=0.53).Conclusions Our study provides real-world data on highly resistant A.baumannii infections and shares the characteristics of infections with such resistant strains.Unfortunately,carbapenem resistance in A.baumannii is a challenge for intensive care specialists who are faced with few treatment options,and colistin resistance further complicates the problem.