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ObjectivesTo show the practice of robot-assisted laparoscopic inferior vena cava (IVC) treatment strategies in patients with retroperitoneal tumors.Patients and MethodsFrom October 2020 to July 2021, 17 patients with retroperitoneal tumors successfully underwent robot-assisted laparoscopic tumor resection with IVC management. The patient details, tumor characteristics, intraoperative data, pathological features and severe complications were assessed. The IVC treatment strategies were divided into 4 ways: ①local resection and primary repair of the IVC; ②IVC ligation; ③ IVC reconstruction by bovine pericardial grafts; and ④ IVC transection and anastomosis.ResultsIn terms of IVC management, 5 cases had conventional total occlusion of the IVC and its branches, 3 cases had delayed occlusion of the proximal IVC technique, 2 cases had IVC resection by Satinsky clamp, 5 cases had IVC ligation, 1 case had IVC reconstruction by bovine pericardial grafts and 1 case had IVC transection and anastomosis. The median operation time was 151 min, and blood loss was 500 ml. There was no severe complication perioperatively. The follow-up time of 17 patients was 8 to 17 months (median: 12 months). No local recurrence or overall death was found during follow-up.ConclusionsThese robot-assisted laparoscopic IVC treatment strategies were considered to be safe and feasible in experienced centers, as well as helpful to completely remove the tumor for better oncological prognosis and restore the blood reflux of IVC as much as possible to ensure fewer postoperative complications.

Objection: The aim of the study was to determine the prognostic value of preoperative blood parameters in patients with renal cell carcinoma (RCC) and tumor thrombus (TT) treated surgically.Method: we retrospectively analyzed 152 patients diagnosis with RCC and TT and treated surgically. Clinicopathologic data and blood parameter were obtained. Univariable and multivariable analysis using the Cox regression model were performed to determine risk factors that were associated with progression-free survival (PFS) and overall survival (OS). Kaplan-Meier curve and logistic regression were performed to analyze the risk factors.Results: Preoperative Hgb＜120g/L (HR=2.48, P=0.024) and lymph node metastasis (HR=3.98, P=0.032) were an independent prognostic factors associated with OS. Preoperative PLT≥300×109/L (HR=2.10, P=0.014) and lymph node metastasis (HR=3.42, P=0.021) were an independent prognostic factors associated with PFS. In Kaplan–Meier survival analysis, preoperative anemia had worse OS than without anemia (P=0.003) and thrombocytosis had worse PFS than without thrombocytosis (P=0.001). Preoperative anemia were associated with more symptomatic (P=0.009), surgical time≥6h (P=0.016), Blood loss≥1000ml (P=0.014), transfusion(P=0.012), higher thrombus level (III-IV) (P=0.004) and higher nuclear grade (III-IV) (P=0.002) while thrombocytosis were associated with more symptomatic (P=0.008) and higher nuclear grade (III-IV) (P=0.042)Conclusions: Preoperative anemia and thrombocytosis was associated with adverse prognosis in patients with non-metastatic RCC with TT. Both preoperative hemoglobin level and platelet count may be clinical useful for risk stratifying patients receiving operation for non-metastatic RCC with TT.

Background To explore the safety and effectiveness of a modified surgical technique which could shorten the time of renal ischemia in left renal cancer and Mayo level II to IV inferior vena cava (IVC) tumor thrombus. Method We retrospectively analyzed the clinical data of 14 cases with left renal cell carcinoma (RCC) and Mayo level II to IV IVC tumor thrombus from February 2015 to July 2019. Preoperative imaging showed that there was no obvious sign of tumor thrombus invading the blood vessel wall. During the surgery, after the right renal artery, the right renal vein and the distal end of IVC were blocked, the balloon catheter was used and the tumor thrombus was removed completely from the IVC. The incision of IVC was closed by Satinsky clamp to make IVC partially blocked. Then the right renal artery and right renal vein were released. The incision of IVC was sutured continuously. At last, the Satinsky clamp and the blocking band at the distal end of the IVC were released. Result There were 8 cases (57.1%) of Mayo level II, 3 cases (21.4%) of Mayo level III and 3 cases (21.4%) of Mayo level IV. The operation was successfully completed in all 14 patients. There were 2 cases (14.3%) operated by complete laparoscopic approach, 8 cases (57.1%) by open approach, and 4 patients (28.6%) by laparoscopic conversion to open approach. The occlusion time of right renal artery and vein (renal ischemia time) was 3 to 15 min, with an average of (6.8 ± 3.2) minutes. The mean time of IVC occlusion was (19.4 ± 4.9) min. Preoperative creatinine was 66 to 130 μmol/L, with an average of (96.6 ± 21.2) μmol/L. One week after operation, serum creatinine was 64 to 632 μmol/L, with an average of (132.4 ± 144.9) μmol/L. Among the 14 cases, 5 (42.9%) had early postoperative complications. Besides one of the 14 patients died in perioperative period, the median follow-up of other 13 cases was 10 months (range: 4–29 months). The 5 (35.7%) of the 14 cases were died of disease. Conclusion This modified procedure was relatively safe and effective in shortening the time of renal ischemia in left RCC patients with Mayo II to IV IVC tumor thrombus.

INTRODUCTION AND OBJECTIVE:To develop and validate Peking University Third Hospital Score (PKUTH Score) for the prediction of intraoperative blood loss volume in radical nephrectomy and thrombectom...

Time-series data from the 2003 to 2013 actual wildfire records were analyzed. The evidence of self-organization criticality (SOC) for wildfire time series in three areas (Guizhou Province, ...

The aim of this study was to provide a scientific basis for a unified standard of the reference value of healthy presenile human hematocrit in China. We studied the relationship between the reference values of healthy presenile human hematocrit, tested according to Wintrobe’s laws, and five geographical factors. It was found that altitude is the most important factor affecting the reference value of the hematocrit. As the altitude gradually increases, the reference value of the hematocrit also increases. The relationship is quite significant. By using the method of stepwise regression analysis, two multivariate regression equations were deduced: Yˆ(1) = 39.7 + 0.00328X(1) + 0.00169X(2) + 0.00117X(5) ± 2.3, Yˆ(2) = 38.8 + 0.00275X(1) + 0.000578X(2) –0.00298X(4) ± 2.2 In these equations, Yˆ(1) is the reference value of presenile men’s hematocrit (%); Yˆ(2) is the reference value of presenile women’s hematocrit (%); X(1) is altitude (m); X(2) is the average annual hours of sunshine (h); X(4) is the average annual temperature (°C), and X(5) is the average annual precipitation (mm). If the geographical index values in a particular area in China are known, the reference value of presenile human hematocrit in this area can be calculated approximately by means of the regression equations. J. Clin. Lab. Anal. 16:26–29, 2002. © 2002 Wiley‐Liss, Inc.

Recently public, government, company and other forms of communities are extremely vocal about their opinions and perceptions on their appeals, policies and products on the micro-blog. Sentiment analysis on micro-blog data has attracted much attention for its application on opinion polarity, classification, summarization and query. However, the related state-of-the-art approaches for sentiment analysis are mainly focused on Twitter data. They don't work well with Chinese micro-blog for word segmentation, feature word combination and feature extraction problems. In this paper, we propose to improve Chinese micro-blog sentiment analysis performance by 1) use sliding window feature combination detection and sentiment phrase dictionary combined method to address semantic recognition problems on metaphor, adversative, multiple negation and irony; 2)propose ten Chinese micro-blog features for sentiment analysis; 3)find most impactful feature combination for the sentiment classifier. Experimental results show that our semantic sentiment space model is helpful to Chinese micro-blog sentiment classification and our basic feature combination outperforms the traditional classification algorithm TD-IDF and KNN on standard measurement.

Serious icing disasters threaten the safe running of power system. Overhead ground wires are difficult to de-ice with common heat de-icing methods in some special areas. A mobile DC de-icer for the overhead ground wire is developed in this paper to realize flexible de-icing. A diesel generator provides the 50 Hz three-phase power supply. A rectifier transformer is used to step up the voltage and a rectifier is used to convert AC to DC. The 12-pulse rectification mode is adopted to reduce the current harmonics of the rectifier and to decrease the ripple of the DC output. Onsite experiment of the mobile DC de-icer for the overhead ground wire is performed on a GJ-70 typed overhead ground wire with the length of 4847 meters. A temperature rise of 7.0°C is achieved in 36 minutes under the DC de-icing voltage of 2700 V and current of 100 A. The result shows that the mobile DC de-icer for overhead ground wire can operate reliably and can meet the demand of flexible de-icing.

Grounding grids play an important role in guarantee the safe operation when the station has encountered the short circuit or be attacked by lighting. Grounding grids must reconstruct when grounding resistance does not meet the regulation requirements. Using ion earthing electrode to reconstruct the grounding grid will cost less and have better effect. However, this way may increase the corrosion of grounding grid. In this paper, “ Ion earthing electrode with anti-corrosion” grounding grid reconstruction technique is presented. This technique not only exerts the advantages of ion earthing electrode but also prevents grounding grid from corrosion. It was applied in 500kV Aijiachong power station, 220kV Nanzhutang power station, and so on. Grounding resistances of these power stations reached prospective effect after reconstruction.

Lightning activity is a common phenomenon, which always is a great thread to safety of power grid, and it's the important reason for the accident of power grid and non-planned stopped operation. Through make analysis on the statistics data of lightning activities in Hunan area, we summarize that the historic discipline of lightning activity, and propose six typical weather situations which is prone to appear lightning weather. And this proposed method has been taken to make lightning forecast. Through giving lightning forewarning information, it can offer great guidance to the anti-lightning work of transmission line.

This article introduced the design background of online monitoring system of transmission line icing, and the reason of it being struck by lightning, which is easy to be received in the thunder and lightning environment. The article also proposed a method about the monitoring system of transmission line icing protecting against lightning, and analysis devices of protecting against lightning, over current and over voltage. It provided the design reference of online monitoring system of protection against lightning on the open country transmission line and the towers.

Serious lightning or icing often causes flashover on the insulators and probably results in a tripping accident. A novel composite insulator with lightning protection and icing flashover prevention is presented. The novel composite insulator with the rated voltage of 220 kV, specified mechanical load of 100 kN for the whole insulator and the nominal discharge current of 10 kA for the lightning protection part is designed and is manufactured. Basic performance, electrical performance, and mechanical performance are tested for the novel composite insulator. The experimental results show that the novel product meets the requirements of both standards of the common composite insulator and the common line metal oxide surge arrester and achieves the application conditions.

This article introduces the project's background of the transmission line icing thickness regelation. Through analyzing characteristics of transmission line scene pictures, there are two main technical difficulties. The lower edge of the wire is in shadow and the complex background of the wire, respectively, which are encountered in the scene image pre-processing. This article proposes using a common method, such as threshold segmentation for grayscale images, and using a gradient operator for the edge extraction on the transmission line icing image. We use a line-search algorithm to calculate the value of the thickness of transmission line ice covering. We use several tests applied to many images on different complex backgrounds to prove the algorithm is effective.