Research and Application of Micro-Expansion and Anti-Channeling Cement Slurry System in Agadem Oilfield

The overall liner cementing qualification rate is only 40% in Agadem block of Niger, The cement slurry system used in the field has a UCA transition time of 43min, and an expansion rate of -0.03% in 24h, which result in a poor anti-gas channeling performance. The expansive agent and the anti-gas channeling toughening agent of anti-channeling agent were optimized through experiment study. A novel micro-expansion anti-gas channel cement slurry system which is suitable for Agadem block was obtained through experiment optimization study: 100% G +2 ∼ 4% fluid loss agent +3 ∼ 4.5% anti-channeling agent +1 ∼ 2% expansion agent-100S +0.15 ∼ 0.4% retarder +0 ∼ 0.3% dispersant +0 ∼ 0.25% defoamer + water. This new cement system has a good anti-gas channeling performance, the cement strength is 24.5-35.0MPa after 24hrs, the UCA transition time is 16-18min, and the expansion rate is 1.5-1.7%. At the same time, a cementing prepad fluid suitable for the block and the micro-expansion cement slurry system is selected to ensure the performance of the cement slurry's anti-channeling performance. The field test results proofs the good performance of the new cement system. The cementing qualification rate of Koulele W-5 well is 96%, and the second interface cementation is Good. The cementing qualification rate of Trakes CN-1 well is 100% which second interface cementation is Excellent. This paper has positive guidance and reference for cementing in Agadem block.

Design and Simulation of a Garlic Seed Metering Mechanism

According to the agronomic requirements of garlic sowing, the garlic morphology is studied and a garlic seed metering mechanism with excellent seeding performance is designed. Based on this design, a new garlic seeding machine with an adjustable-size seeding device is developed to realize efficient single-seed metering and seeding of different varieties of garlic. Further, the design scheme of the garlic seeder prototype is established, with the key components of the garlic seeding being designed on the basis of the garlic seeding mechanism. To achieve garlic single-seed metering for different varieties of garlic, the optimal adjustment size of the garlic seed metering device is determined through discrete element simulation analysis. A field experiment confirms the effectiveness of applying the proposed garlic planter to field sowing in terms of the metrics of missing seed and multiple seed rates. The results of the discrete element simulation test reveal that an adjustment size of 40 mm yields the best single-seed metering performance. At an operating speed of 15–35 rpm, the metering device can achieve more than an 80% qualification rate of single-seed metering, with a unit speed of 0.628–1.465 m/s. Thus, the developed garlic seeding device meets the requirements of precision sowing in China and can effectively realize the mechanized planting of garlic.

Effect of Comprehensive Nursing Intervention on Intestinal Preparation Quality of Hospitalized Patients undergoing Colonoscopy

Objective: To explore the impact of comprehensive nursing intervention on the quality of intestinal preparation in the process of intestinal preparation for hospitalized patients undergoing colonoscopy. Methods: A total of 320 patients underwent colonoscopy in our department from January to June 2021. They were grouped by random number table. There were 160 cases in the control group and 160 cases in the observation group. The adverse reactions of intestinal preparation and the cleanliness of intestinal preparation were analyzed. Results: Through comprehensive nursing intervention, it can be found that the incidence of adverse reactions in the preparation of colonoscopy in the control group was 24.38%, and that in the observation group was 13.48%. The results showed that the incidence of adverse reactions in the preparation of colonoscopy was significantly lower than that in the control group (P < 0.05), which indicates that the difference was statistically significant. In the control group, 105 people qualified in intestinal cleanliness score (> 5 points) during enteroscopy preparation, and the cleanliness qualification rate was 65.63%. In the observation group, 139 people qualified in intestinal cleanliness score (> 5 points) during enteroscopy preparation, and the cleanliness qualification rate was 86.88%. The cleanliness qualification rate of enteroscopy preparation was significantly higher than that of the control group, and P < 0.05, which indicates that the difference was statistically significant. Conclusion: Comprehensive nursing intervention can promote the quality of preparation of patients for colonoscopy, improve the compliance of patients and improve the accuracy of examination effect.

The Study of Grading Method and Application Performance of Management Systems of Rural Potable Water Treatment Plants

The application of management systems can solve the manage problems and improve the potable water safety for rural potable water treatment plants. The systems in Zhejiang province, China are studied and the system grading method is proposed as attendance management (G1), basic automatic management (G2), quantity-based automatic management (G3), quality-based intelligent management (G4), quality-based & feedback controlled intelligent management (G5). G3 to G5 systems can achieve remote control and G4, G5 systems can guarantee the finished water quality theoretically. The application performance of the management systems shows G5 system has the lowest allocated annual cost as 11500 RMB per year when used to service life as 5 years (23.37% of G1 system). By using G5 system, the finished water turbidity is below 0.8 NTU, pH is between 7.6 to 8.2, and the qualification rate of residual chlorine is above 92.5%, which performances better than G3 system with finished water turbidity below 9.7 NTU, pH between 7.3 to 8.2, and the qualification rate of residual chlorine above 88.7%. G5 system is recommended when the plant is hard to be staffed or the inlet water quality is not good. G3 system is recommended when the inlet water quality is good or the purchase budget is limited.

Design of a Sweet Potato Transplanter Based on a Robot Arm

Traditional sweet potato transplanters have the problem of seedling leakage and can only accomplish one transplantation method at a time, which does not meet the requirements of complex planting terrain that requires multiple transplantation methods. Therefore, this paper proposes a design for a crawler-type sweet potato transplanting machine, which can accomplish a variety of transplanting trajectories and conduct automatic replanting. The machine has a transplanting piece and a replanting piece. The transplanting piece completes the transplanting action through a transplanting robot arm, and the replanting piece detects the transplanting status by deep learning. The mathematical model of the transplanting robot arm is built, and the transplanting trajectory is inferred from the inverse kinematics model of the transplanting robot. In the replanting piece, a target detection network is used to detect the transplanting status. The DBIFPN structure and the CBAM_Dense attention mechanism are proposed to improve the accuracy of the target detection of sweet potato seedlings. The experiment showed that the transplanting robot arm can transplant sweet potatoes in horizontal and vertical methods, and the highest transplanting qualification rate is 96.8%. Compared with the use of the transplanting piece alone, the leakage rate of the transplanting–replanting mechanism decreased by 5.2%. These results provide a theoretical basis and technical support for the research and development of sweet potato transplanters.

Optimizing Slag Content to Control Ds-Type Inclusions in 10B21 Cold Heading Steel

Ds-type inclusions during production are an important factor affecting the performance and quality of manufactured 10B21 steel. To minimize Ds-type inclusions in steel and improve the production qualification rate of steelmaking plants, a refining slag system optimization scheme was proposed based on the analysis of current inclusion evolution during the steelmaking process, and industrial tests were conducted to verify improvements resulting from application of the proposed scheme. The results showed that the composition of Ds inclusions in 10B21 steel are mainly CaO–Al2O3–MgO–CaS–TiN, which exists in the form of calcium–magnesium aluminate coated with titanium nitride and calcium sulfide. The main reason for the formation of Ds inclusions is the poor fluidity of the refining slag and its low capability to absorb inclusions. The poor coverage of the refining slag on the molten steel during refining can easily cause secondary oxidation of the molten steel. Thus, the formation and growth of Ds-type inclusions are aggravated after the calcium feeding line and soft blowing operation. Here, we propose to minimize Ds inclusions using our optimized refined slag system. The mass percentage of the optimized slag system is CaO: 55–60%, Al2O3: 20–35%, SiO2: 3–7%, MgO: 4–8%, (MnO + FeO) < 1%, and the basicity is controlled within the range of 7–11. We observed that our optimized refining slag system has a significantly improved ability to remove inclusions, particularly Ds inclusions, which improves the qualification rate of 10B21 steel.

Coupled Bionic Design Based on Primnoa Mouthpart to Improve the Performance of a Straw Returning Machine

The high energy consumption and low crushing length qualification rate of traditional straw returning machines in the main maize-growing regions of northeast China make it difficult to promote straw returning operations in the region. The primnoa locust mouthpart is extremely efficient in cutting maize rootstocks. In this paper, it was found that there are significant differences between the primnoa locust mouthpart and the conventional machine, these exist mainly in the cutting edge structure and cutting motion. Thus, this paper develops a coupled bionic design for structural and kinematic coupling elements to develop a bionic straw returning machine. This paper found that the operating performance of the bionic straw returning machine was mainly affected by the blade rotation radius and the output rotation speed of the drive mechanism through DEM (discrete element method) simulation, and the optimal combination of the two parameters was 248 mm rotation radius and 930 r/min output rotation speed. Finally, this paper finds that the most obvious operational performance difference of the bionic straw returning machine compared with the traditional straw returning machine is that it can reduce the cutting power consumption by 9.4–11.7% and improve the crushing length qualification rate by 10.4–14.7% through the operational performance comparison test. Based on the above findings, this paper suggests that in future research and development of straw returning machines, more attention can be focused on finding suitable bionic prototypes and improving bionic design methods.

Clinical Application of a Modified Local Transposition Flap Surgery in Repairing Fingertip Defects

Purpose: A modified local transposition flap surgery was performed for fingertip injuries. Given the shape of the flap turnover resembling a parallelogram, we called it a parallelogram flap. This transposition flap surgery allows a more significant transfer distance with good outcomes.Method: The study collected patients who underwent parallelogram transposition flaps to repair fingertip defects from 2017 to 2020. 32 cases (32 fingers) were included in our study, including 20 males and 12 females, aged 17 to 60 years, with an average age of 36 years. The causes of injury were crush injury in 13 cases, punch injury in 11 cases and sharp cutting injury in 8 cases. There were 6 cases in thumbs, 6 cases in index fingers, 14 cases in middle fingers, 4 cases in ring fingers and 2 cases in little fingers. The area of fingertip defects was 1.2 cm × 2~3 cm × 4 cm, with bone exposure. The interval between the injury and operation was 5.78 h (the mean value was 4.7-8.4 h). All operations were performed by one surgical team, and the average operation time was 31.2 min.Record The length and width of the finger，two-point discrimination（2PD），Total Active Movement (TAM)and the MHQ (Michigan Hand Questionnaire) of the injured fingers to evaluate the therapeutic effect.Results: all our parallelogram flaps had survived postoperatively.，At last follow-up,There was no difference between the length and width of the reconstructed finger and that of the healthy side（P>0.05）. The qualification rate of the static 2PD of the flaps were 84.37% .The qualification rate of the TAM of injured figures were 100% . Evaluation of the MHQ subscale performance showed that the score of the overall hand function is 93.71, activities of daily living is 95.22, work performance is 94.23,pain score is 4.34 , aesthetics is 92.15 and satisfaction score is 92.45.All of these were perform well.Conclusion: This transposition flap surgery allows a more significant transfer distance with good outcomes.

Physiological Properties and Molecular Regulation in Different Edamame Cultivars under Drought Stress

Edamame (Glycine max (L.) Merr.) is an important economic crop worldwide and is a good source of protein and nutrients. Kaohsiung No. 9 (KH9), Kaohsiung No. 11 (KH11), and Xiang-Ji (XJ) are three major edamame cultivars planted in Taiwan. Edamame has high water requirements in all development stages. Insufficient irrigation causes aborted blossoms, small pods, and shriveled beans, thus greatly reducing the yield. We examined the three aforementioned cultivars in drought conditions during the blooming period. The results revealed that drought stress decreased the yield in all three cultivars; however, XJ and KH11 showed better drought resistant ability than KH9 did. The reduction of the qualification rate and the dry weight of qualified pods by drought stress in XJ, KH9 and KH11 was 23%, 33%, 21% and 32%, 62%, and 44%, respectively. The quantitative reverse-transcription polymerase chain reaction results indicated that genes involved in the abscisic acid (ABA) biosynthesis, ABA-dependent, and ABA-independent pathways were upregulated by drought stress in KH11, which may explain why KH11 produced higher yields than KH9 after drought treatment. We determined that drought-related signaling transduction differed among these edamame cultivars, resulting in different drought tolerance.

Investigation of the fake reject cases with unqualified operational dimension based on the error compensation and tolerance compression

A fake reject (FR) with unqualified operational dimension often occurs during part machining when the operational data do not coincide with the design ones. This may lead to unnecessary waste. A novel judgment and remedial measures for FR are investigated in this paper to enhance products' qualification rate. Firstly, the reasons for the FR occurrence are discussed based on the fact that the operational dimension tolerance calculated using the worst-case method of the process dimension chain calculation is too tight. Secondly, a novel judgment method of FR is proposed by calculating a new dimension chain. The operational dimension is treated as the concluding link. The actual deviations of the dimensions generated before the operational dimension generation are used to replace their upper and lower deviations. Finally, based on the error compensation relationship among the component links in the process dimension chain, a novel remedial measure of FR by compressing dimension tolerance in subsequent processing is proposed. The calculation flow of the dimension tolerance after tolerance compression is worked out. This study's results of this study are considered for instrumental in judging and processing FR in part machining.