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Luojia 1-01 satellite, launched on 2 June 2018, provides a new data source of nighttime light at 130 m resolution and shows potential for mapping urban extent. In this paper, using Luojia 1-01 and VIIRS nighttime light imagery, we compared several methods for extracting urban areas, including Human Settlement Index (HSI), Simple Thresholding Segmentation (STS) and SVM supervised classification. According to the accuracy assessment, the HSI method using LJ1-01 data had the best performance in urban extent extraction, which presented the largest Kappa Coefficient value, 0.834, among all the results. For the urban areas extracted by VIIRS based HSI method, the largest Kappa Coefficient value was 0.772. In contrast, the largest Kappa Coefficient values obtained by STS method were 0.79 and 0.7512 respectively when using LJ1-01 and VIIRS data, while for SVM method the values were 0.7829 and 0.7486 when using Landsat-LJ and Landsat-VIIRS composite data respectively. The experimented results demonstrated that the utilization of nighttime light imagery can largely improve the accuracy of urban extent extraction and LJ1-01 data, with a higher resolution and more abundant spatial information, can lead to better identification results than its predecessors.

Preoperative nutrition score (NRS 2002) > or = 3 predicted more postoperative complications and longer length of hospital stay. It indicated that preoperative nutritional support was necessary in patients with a preoperative nutritional score (NRS 2002) > or = 3.

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Objective measurements and their intersection with subjective perceptions demonstrate the influences of inter-generation, season, sex, and living habits on Chinese body skin.

Objective: To evaluate clinical and radiological outcomes of proximal femoral nail anti-rotation (PFNA-II) devices and demonstrate the effectiveness of PFNA-II for the treatment of basicervical fractures in elderly patients. Methods:A retrospective review of all patients treated with PFNA-II for a proximal femoral fracture between January 2013 and February 2017 at three different institutions (Shanghai General Hospital, Shanghai Punan Hospital and Shanghai Seventh People's Hospital) was conducted. The X-ray films were strictly reviewed by three trauma surgeons and a professional radiology doctor. Patients over 60 years of age who met the following criteria were included: (i) sustained low-energy trauma; (ii) a two-part fracture; (iii) fracture line located at the base of the femoral neck and that was medial to the intertrochanteric line and exited above the lesser trochanter but was more lateral than a classic transcervical fracture. Follow-up time should be longer than 6 months. A total of 52 patients who met the inclusion criteria were selected. The average age at diagnosis was 75.1 years (range, 63-91 years); 13 patients were men and 39 were women. The same proximal femoral nail anti-rotation devices and the same surgical procedures were applied to all patients. Postoperative radiographic union time and modified Harris hip scores were used as major indicators for evaluating the effectiveness of surgery. Results:The average follow-up period was 22.5 months (18.5, 23.9, and 21.2 months, respectively) and radiographic unions were observed at an average of 19.6 weeks (range, 12-28 weeks). The patients were evaluated immediately after surgery, as well as 6 weeks, 3 months, 6 months, 1 year, and 2 years postoperatively. Of the 49 patients, 38 had good reduction qualities (75.5%), 9 acceptable (18.3%), and 3 poor (6.1%). Radiographic union was confirmed in all fractures at an average of 19.6 weeks (range, 12-28 weeks). The mean Harris hip score was 84.9 (range, 65-99): excellent in 9 patients (18.36%), good in 30 (61.22%), medium in 8 (16.32%), and poor in 2 (4.08%). Slight persistent pain occurred in 3 patients, but these patients could still walk with the help of a cane. Two patients had symptoms of excessive telescoping. Eight patients experienced postoperative medical complications, mainly pneumonia and urinary tract infection.Conclusion: Based on the clinical and radiological outcomes, the PFNA-II devices provide strong rotational stability and excellent clinical prognosis, and are an appropriate treatment option for basicervical proximal femoral fracture in elderly patients.

This meta-analysis compared harmonic scalpel and LigaSure systems with the conventional clamp-and-tie technique in thyroidectomy. Medline, Cochrane, EMBASE, and Google Scholar databases were searched until December 30, 2015. Randomized controlled studies (RCTs) or two-arm prospective studies were included. The primary outcome was operation time. The data were evaluated both by pair-wise meta-analyses and network meta-analysis within a Bayesian framework using Markov chain Monte Carlo methods. Compared with the conventional hemostasis, there was a significant reduction in operation time with harmonic scalpel (HS) and LigaSure (LS) (difference in means = -24.27 min, 95 % CI -28.11 to -20.44 min, P < 0.001; and difference in means = -13.08 min, 95 % CI -16.88 to -9.27 min, P < 0.001, respectively). For total thyroidectomy and hemi-thyroidectomy, subgroup pair-wise meta-analyses found a reduction of 26.31 and 21.90 min in operation time for harmonic scalpel, and a reduction of 12.77 and 17.48 min for LigaSure, respectively. Among studies with mixed total and hemi-thyroidectomy, no significant difference in operation time was seen between harmonic scalpel and the conventional hemostasis (P = 0.313). Network meta-analysis also found harmonic scalpel and LigaSure to have less operation time than the conventional hemostasis, and that harmonic scalpel was associated with a significant 9.78 min reduction in operation time than LigaSure which was not seen in pair-wise comparison. Harmonic scalpel had significantly less risk of definitive recurrent laryngeal nerve palsy, intra-operation blood loss, and post-operation bleeding than the conventional hemostasis. LigaSure was associated with significantly less intra-operative blood loss than the conventional hemostasis (P = 0.023). There was no significant difference among three different procedures in rates of transient recurrent laryngeal nerve palsy. This study found that harmonic scalpel and LigaSure decreased operation time compared with the conventional hemostasis and that harmonic scalpels was associated with the lowest operation time.