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基于色差的自适应权重亚像素渲染算法
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作者 董家昌 温元毅 +3 位作者 郑喜凤 黄德举 毛新越 赵丽婷 《液晶与显示》 北大核心 2025年第9期1275-1288,共14页
Micro-LED显示通过亚像素复用技术实现了超越显示器物理分辨率的图像呈现,从而在提升感知分辨率的同时有效降低了生产成本。然而,传统针对RGB三角排布的不加权平均渲染算法容易导致颜色失真问题,进而严重影响图像显示质量和用户的观看... Micro-LED显示通过亚像素复用技术实现了超越显示器物理分辨率的图像呈现,从而在提升感知分辨率的同时有效降低了生产成本。然而,传统针对RGB三角排布的不加权平均渲染算法容易导致颜色失真问题,进而严重影响图像显示质量和用户的观看体验。为解决这一问题,本文提出了一种基于色差的自适应权重亚像素渲染算法。该算法由图像预处理模块、颜色空间转换模块、自适应权重计算模块和亚像素渲染模块构成。首先,图像预处理模块对输入图像进行边界扩展,确保在后续亚像素渲染过程中不会出现越界问题。接着,颜色空间转换模块将读取到的像素进行通道分离与扩展,并从sRGB颜色空间转换至CIELab颜色空间。随后,自适应权重计算模块通过计算像素间色差的极差实现场景匹配,为输出亚像素赋值。若未能匹配到对应场景,则选取中心像素,并根据相邻像素的色差计算权重值。最后,亚像素渲染模块依据权重值计算输出亚像素的灰度值,完成最终图像的渲染。实验结果表明,相较于传统的不加权平均亚像素渲染算法,本文提出的基于色差的自适应权重亚像素渲染算法在DIV2K数据集上的表现更为优异。具体而言,均方误差降低了14.53761,峰值信噪比提升了0.82821 dB,结构相似度提高了0.01496,特征相似性指数提高了0.00083,视觉信息保真度提高了0.00966。该算法显著抑制了颜色失真问题,有效提升了显示质量及用户的观看体验。 展开更多
关键词 Micro-LED 亚像素复用 色差 自适应权重分配 亚像素渲染
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聚酰亚胺纳米纤维膜的制备及性能调控研究进展
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作者 宇平 张乐乐 +7 位作者 贾子辰 黄琦睿 龙映雪 彭万 贾雪梦 朱家强 孙昊 李婷 《化工新型材料》 北大核心 2025年第5期1-5,共5页
静电纺丝法制备的聚酰亚胺(PI)纤维膜具有高的孔隙率、透气性及表面积,融合并放大了PI材料和微纳米结构的优异特性。从PI和静电纺丝两个概念及特点出发,介绍了这一具有特殊微纳米结构和微观形貌的高分子材料,总结了用于制备PI纳米纤维... 静电纺丝法制备的聚酰亚胺(PI)纤维膜具有高的孔隙率、透气性及表面积,融合并放大了PI材料和微纳米结构的优异特性。从PI和静电纺丝两个概念及特点出发,介绍了这一具有特殊微纳米结构和微观形貌的高分子材料,总结了用于制备PI纳米纤维膜的现有工艺策略,重点介绍了PI纤维膜的相关改性技术方法,阐明了其具体的性能优势。最后,指出了PI纳米纤维膜未来发展趋势及所面临的关键技术挑战。 展开更多
关键词 聚酰亚胺纤维膜 静电纺丝 改性 技术挑战
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It’s Not Always What You Think It Is—A Case of a Thumb Mass Found to Be a Schwannoma
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作者 Harin B. Parikh Deeti J. Pithadia +1 位作者 Bonnie L. Balzer Stuart H. Kuschner 《Open Journal of Orthopedics》 2025年第2期102-109,共8页
Soft tissue tumors in the hand have a broad differential diagnosis. Included in the list of differential diagnoses for these tumors are Schwannomas, which are benign tumors within the peripheral nervous system [1]. Sc... Soft tissue tumors in the hand have a broad differential diagnosis. Included in the list of differential diagnoses for these tumors are Schwannomas, which are benign tumors within the peripheral nervous system [1]. Schwannomas are uncommon within the upper extremity, and they are exceedingly rare within the hand and wrist [1]. We describe a case of an 80-year-old female presented with a soft tissue mass within her right thumb. She underwent excisional biopsy of the mass, and pathology showed features consistent with schwannoma. She had resolution of her symptoms thereafter. We discuss the differential diagnosis for soft-tissue tumors in this location. When assessing patients with soft tissue tumors of the hand and wrist, it is important for the treating provider to maintain a broad differential diagnosis in order to facilitate appropriate management of these lesions. 展开更多
关键词 MASSES TUMORS SCHWANNOMA THUMB Upper Extremity
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Effect of beinaglutide,a thrice-daily GLP-1 receptor agonist,on body weight and metabolic parameters:A systematic review and metaanalysis
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作者 Abul Bashar Mohammad Kamrul-Hasan Vanishri Ganakumar +3 位作者 Lakshmi Nagendra Deep Dutta M Rafiqul Islam Joseph M Pappachan 《World Journal of Diabetes》 2025年第5期374-387,共14页
BACKGROUND Beinaglutide,a short-acting glucagon-like polypeptide-1 receptor agonist,has shown variable efficacy in weight reduction and metabolic control in randomized controlled trials(RCTs).AIM To summarize the ther... BACKGROUND Beinaglutide,a short-acting glucagon-like polypeptide-1 receptor agonist,has shown variable efficacy in weight reduction and metabolic control in randomized controlled trials(RCTs).AIM To summarize the therapeutic effects of beinaglutide in patients with overweight/obesity with/without type 2 diabetes.METHODS RCTs involving patients receiving beinaglutide in the intervention arm and placebo or active comparator in the control arm were searched through multiple electronic databases.The change from baseline in body weight was the primary outcome;secondary outcomes included changes in body mass index(BMI),waist circumference(WC),blood pressure,glycemic parameters,lipids,and adverse events(AEs).RevMan web was used to conduct meta-analysis using random-effects models.Outcomes were presented as mean differences(MDs),odds ratios(ORs),or risk ratios(RRs)with 95%confidence intervals(95%CIs).RESULTS Six RCTs(n=800)with mostly some concerns about the risk of bias were included.Over 12-24 weeks,beinaglutide 0.1-0.2 mg thrice daily was superior to the control group in reducing total(MD=-3.25 kg,95%CI:-4.52 to-1.98,I^(2)=84%,P<0.00001)and percent(MD=-4.13%,95%CI:-4.87 to-3.39,I^(2)=54%,P<0.00001)body weight reduction.Beinaglutide also outperformed the control group in achieving weight loss by 5%(OR 4.61)and 10%(OR=5.34).The superiority of beinaglutide vs the control group was also found in reducing BMI(MD=-1.22 kg/m^(2),95%CI:-1.67 to-0.77)and WC(MD=-2.47 cm,95%CI:-3.74 to-1.19]).Beinaglutide and the control group had comparable impacts on blood pressure,glycemic parameters,insulin resistance,hepatic transaminases,and lipid profile.Beinaglutide posed higher risks of treatment discontinuation due to AEs(RR=3.15),nausea(RR=4.51),vomiting(RR=8.19),palpitation(RR=3.95),headache(RR=2.87),and dizziness(RR=6.07)than the control.However,the two groups had identical risks of total and serious AEs,diarrhea,fatigue,and hypoglycemia.CONCLUSION Short-term data from RCTs suggested that beinaglutide causes modest benefits in reducing body weight,BMI,and WC,with no significant difference in glycemic and other metabolic endpoints compared to the control arm.Safety data were consistent with those of the other drugs in the glucagon-like polypeptide-1 receptor agonist class.Larger RCTs are warranted to prove the longer-term metabolic benefits of beinaglutide. 展开更多
关键词 Beinaglutide Glucagon-like polypeptide-1 receptor agonist OBESITY Type 2 diabetes Weight reduction Metaanalysis
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Safety and efficacy of glucagon-like peptide-1 receptor agonists in individuals with type 2 diabetes mellitus fasting during Ramadan:a systematic review and meta-analysis
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作者 Abul Bashar Mohammad Kamrul-Hasan Joseph M Pappachan +4 位作者 Hamid Ashraf Lakshmi Nagendra Deep Dutta Mohammad Shafi Kuchay Shehla Shaikh 《World Journal of Methodology》 2025年第4期374-384,共11页
BACKGROUND Data on the use of glucagon-like peptide-1 receptor agonists(GLP-1RAs)in individuals with type 2 diabetes mellitus(T2DM)during Ramadan fasting is limited.No meta-analysis has summarized the safety and effec... BACKGROUND Data on the use of glucagon-like peptide-1 receptor agonists(GLP-1RAs)in individuals with type 2 diabetes mellitus(T2DM)during Ramadan fasting is limited.No meta-analysis has summarized the safety and effectiveness of GLP-1RAs in these situations.AIM To evaluate the safety and efficacy of GLP-1RA in patients with T2DM fasting during Ramadan.METHODS Electronic databases were systematically searched for relevant studies that featured GLP-1RA in the intervention arm and other glucose-lowering medications in the control arm.The primary outcome was adverse events(AEs)during Ramadan for both groups;other outcomes included changes in glycemic and anthropometric measures during the peri-Ramadan period.RESULTS Four studies[three randomized-controlled trials with low risk of bias(RoB)and one prospective observational study with serious RoB]involving 754 subjects were analyzed.GLP-1RA group achieved greater glycated hemoglobin reduction than the non-GLP-1RA group[mean difference(MD):-0.31%,95%CI:-0.61 to-0.01,P=0.04,I2=77%]with a lower risk of documented symptomatic hypoglycemia(risk ratio=0.38,95%CI:0.16 to 0.88,P=0.02).Any AEs,serious AEs,or AEs that led to treatment discontinuation were comparable between the two groups.The GLP-1RA group experienced greater weight loss compared to the non-GLP-1RA group(MD:-2.0 kg,95%CI:-3.37 to-0.63,P=0.004,I2=95%).There were comparable changes in blood pressure and lipid profile between the two groups.GLP-1RA users experienced higher risks of gastrointestinal AEs,nausea,and vomiting;however,the risks of heartburn,abdominal pain,and diarrhea were similar in both groups.CONCLUSION Limited evidence suggests that GLP-1RAs are safe for T2DM management during Ramadan,offering modest benefits in blood sugar control and weight loss.Large multicenter trials are needed to confirm their safety and efficacy in at-risk populations,improving clinical practice decision-making. 展开更多
关键词 Type 2 diabetes mellitus Glucagon-like peptide-1 receptor agonist RAMADAN Religious fasting SAFETY Metaanalysis
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Reasons for discontinuing tirzepatide in randomized controlled trials:A systematic review and meta-analysis
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作者 Abul Bashar Mohammad Kamrul-Hasan Joseph M Pappachan +3 位作者 Deep Dutta Lakshmi Nagendra Mohammad Shafi Kuchay Nitin Kapoor 《World Journal of Diabetes》 2025年第4期284-296,共13页
BACKGROUND Despite therapeutic benefits,discontinuation of tirzepatide is common in randomized controlled trials(RCTs)due to adverse events(AEs)and other causes.No previous systematic reviews have explored the reasons... BACKGROUND Despite therapeutic benefits,discontinuation of tirzepatide is common in randomized controlled trials(RCTs)due to adverse events(AEs)and other causes.No previous systematic reviews have explored the reasons for discontinuing tirzepatide in the RCTs.AIM To explore the reasons for permanent discontinuation of tirzepatide vs controls[placebo,insulin,and glucagon-like peptide-1 receptor agonists(GLP-1Ras)]in RCTs.METHODS Relevant RCTs were systematically searched using related terms through multiple databases such as MEDLINE(via PubMed),Scopus,Cochrane Central Register,and ClinicalTrials.gov from their inception until June 20,2024.RevMan web was used to conduct meta-analysis using random-effects models.Outcomes were presented as risk ratios(RR)with 95%confidence intervals(CI).RESULTS Seventeen RCTs(n=14645),mostly having low risks of bias,were analyzed.Compared to placebo,the risk of permanent discontinuation of the study drug was substantially lower with tirzepatide 10 mg(RR:0.69,95%CI:0.51-0.93,P=0.02)and similar with tirzepatide 5 mg(RR:0.74,95%CI:0.47-1.17,P=0.20)and 15 mg(RR:0.94,95%CI:0.68-1.31,P=0.71).Tirzepatide had identical discontinuation risks when compared to insulin at 5 mg(RR:0.96,95%CI:0.75-1.24,P=0.77)and 10 mg(RR:1.19,95%CI:0.77-1.82,P=0.44)doses,whereas such risk was higher with tirzepatide 15 mg than insulin(RR:1.31,95%CI:1.03-1.67,P=0.03).Compared to GLP-1RA,the permanent discontinuation risk was similar with tirzepatide 5 mg(RR:0.98,95%CI:0.70-1.37,P=0.90)but was higher with tirzepatide 10 mg(RR:1.40,95%CI:1.03-1.90,P=0.03)and 15 mg(RR:1.70,95%CI:1.27-2.27,P=0.0004).Tirzepatide,at all doses,had higher risks of AE-related discontinuation than insulin;such risks were only greater with higher doses of tirzepatide than with placebo or GLP-1RA.Discontinuation risk due to withdrawal by the study subjects was lower with tirzepatide than with placebo or insulin.Compared to the placebo,tirzepatide(all doses)conferred a lower risk of study drug discontinuation due to other causes not specifically mentioned.CONCLUSION The discontinuation risk is not higher in tirzepatide group than in the placebo arm.Many factors other than AEs led to drug discontinuation in the included RCTs. 展开更多
关键词 Tirzepatide Drug adherence Study drug discontinuation Adverse events Withdrawal by the study subjects
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Safety and efficacy of efruxifermin in metabolic dysfunctionassociated steatohepatitis:A systematic review
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作者 Abul Bashar Mohammad Kamrul-Hasan Sanja Borozan +5 位作者 Sweekruti Jena Lakshmi Nagendra Deep Dutta Saptarshi Bhattacharya Md Saiful Islam Joseph M Pappachan 《World Journal of Gastrointestinal Pharmacology and Therapeutics》 2025年第3期54-67,共14页
BACKGROUND Efruxifermin(EFX),a fibroblast growth factor 21 analogue,has demonstrated the potential to improve liver fat and markers of liver injury,fibrosis,and key metabolic biomarkers in individuals with metabolic d... BACKGROUND Efruxifermin(EFX),a fibroblast growth factor 21 analogue,has demonstrated the potential to improve liver fat and markers of liver injury,fibrosis,and key metabolic biomarkers in individuals with metabolic dysfunction-associated steatohepatitis(MASH)in phase 2 clinical trials.AIM To summarize the safety and effectiveness of EFX in managing MASH.METHODS Electronic databases and registries were systematically searched from their inception to May 15,2025,for randomized-controlled trials(RCTs)that included EFX in the intervention arm and placebo in the control arm in individuals with MASH.The primary outcome was the safety of EFX,while additional outcomes included its efficacy in altering hepatic and metabolic parameters.Meta-analyses were conducted using the RevMan web computer program with the random-effects model.RESULTS Four phase 2 RCTs(five reports),mostly with low risk of bias,involving 450 subjects,were analyzed.Compared to the placebo,EFX 50 mg was associated with higher risks of treatment-emergent adverse events(TEAEs)[risk ratio(RR)=1.05],TEAEs leading to discontinuation(RR=3.05),nausea(RR=1.78),and diarrhea(RR=1.9).EFX 28 mg increased risks of vomiting(RR=2.17)and frequent bowel movements(RR=8.98).Both doses of EFX were associated with higher risks of drug-related TEAEs(28 mg:RR=1.45;50 mg:RR=1.67)and increased appetite(28 mg:RR=3.16;50 mg:RR=5.66).EFX(28 and 50 mg)and placebo exhibited identical risks for severe TEAEs,serious AEs,abdominal pain,fatigue,headache,injection site erythema,and injection site reactions.EFX(28 and 50 mg)was associated with improvements in hepatic safety outcomes,including liver enzymes and urate levels.EFX outperformed the placebo in both relative and absolute reductions in hepatic fat fraction.Reductions in enhanced liver fibrosis score,Pro-C3,and liver stiffness were also more robust with EFX.EFX was superior in terms of MASH resolution and improvement in fibrosis stage,MASH resolution and no worsening of the fibrosis stage,and fibrosis regression by≥1 stage and no worsening in steatohepatitis.Furthermore,EFX also improved metabolic parameters,including reductions in HbA1c and insulin resistance,as well as improvements in adiponectin and lipid parameters.CONCLUSION EFX demonstrates promising dual efficacy on liver histology and metabolic markers in MASH.However,gastrointestinal side effects and the need for parenteral administration require caution.Long-term data are still necessary to fully evaluate safety and long-term effectiveness. 展开更多
关键词 Efruxifermin Fibroblast growth factor 21 Metabolic dysfunction-associated steatohepatitis Non-alcoholic steatohepatitis SAFETY Hepatic fat fraction
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Renal effects and safety of tirzepatide in subjects with and without diabetes:A systematic review and meta-analysis
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作者 ABM Kamrul-Hasan Shinjan Patra +4 位作者 Deep Dutta Lakshmi Nagendra AFM Muntahi-Reza Sanja Borozan Joseph M Pappachan 《World Journal of Diabetes》 2025年第2期270-283,共14页
BACKGROUND Type 2 diabetes(T2D),as well as obesity,are risk factors for chronic kidney disease(CKD)and end-stage renal disease.The renal impacts of glucose-lowering and weight-lowering drugs and their potential benefi... BACKGROUND Type 2 diabetes(T2D),as well as obesity,are risk factors for chronic kidney disease(CKD)and end-stage renal disease.The renal impacts of glucose-lowering and weight-lowering drugs and their potential benefits in preventing CKD often guide clinicians in choosing them appropriately.Only limited data based on randomized controlled trials(RCTs)is currently available on the renal effects and safety profile of tirzepatide.AIM To explore the renal benefits and safety of tirzepatide vs controls.METHODS RCTs involving patients receiving tirzepatide for any indication in the intervention arm and placebo or active comparator in the control arm were searched through multiple electronic databases.The co-primary outcomes were percent change from baseline(CFB)in urine albumin-to-creatinine ratio(UACR)and absolute CFB in estimated glomerular filtration rate(eGFR;in mL/min/1.73 m^(2));the secondary outcome was tirzepatide’s renal safety profile.RevMan web was used to conduct meta-analysis using random-effects models.Outcomes were presented as mean differences(MD)or risk ratios with 95%confidence intervals.RESULTS Fifteen RCTs(n=14471)with mostly low risk of bias(RoB)were included.Over 26-72 weeks,tirzepatide 10 mg[MD-26.95%(-40.13,-13.76),P<0.0001]and 15 mg[MD-18.03%(-28.58,-7.47),P=0.0008]were superior to placebo in percent reductions of UACR.Tirzepatide,at all doses,outperformed insulin in percent reductions of UACR.Compared to the placebo,the percent UACR reduction was greater in subjects with T2D than those with obesity but without T2D(MD-33.25%vs-7.93%;P=0.001).The CFB in eGFR with all doses of tirzepatide was comparable[5 mg:MD 0.36(-1.41,2.14);10 mg:MD 1.17(-0.22,2.56);15 mg:MD 1.42(-0.04,2.88)];P>0.05 for all vs insulin.Tirzepatide(pooled and separate doses)did not increase the risks of adverse renal events,urinary tract infection,nephrolithiasis,acute kidney injury,and renal cancer compared to the placebo,insulin,and glucagon-like peptide-1 receptor agonists.CONCLUSION Short-term data from RCTs with low RoB suggests that tirzepatide positively impacts UACR without detrimental effects on eGFR in subjects with T2D and obesity without T2D,with a reassuring renal safety profile.Larger RCTs are warranted to prove the longer-term renal benefits of tirzepatide,which might also prevent eGFR decline and worsening of CKD. 展开更多
关键词 Tirzepatide Type 2 diabetes Obesity Urine albumin creatinine ratio Estimated glomerular filtration rate Renal safety Acute kidney injury Chronic kidney disease
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Prevalence of diabetes distress among people with type 2 diabetes in South Asia:A systematic review and meta-analysis
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作者 Abul Bashar Mohammad Kamrul-Hasan Joseph M Pappachan +8 位作者 Lakshmi Nagendra Dimuthu Muthukuda Deep Dutta Saptarshi Bhattacharya Dina Shrestha Guru Prasad Dhakal Manilka Sumanatilleke Syed Abbas Raza Sanjay Kalra 《World Journal of Diabetes》 2025年第8期316-330,共15页
BACKGROUND Diabetes distress(DD),an emotional problem arising from the challenges of living with diabetes and the relentless burden of daily self-management,is common among patients with type 2 diabetes(T2D).South Asi... BACKGROUND Diabetes distress(DD),an emotional problem arising from the challenges of living with diabetes and the relentless burden of daily self-management,is common among patients with type 2 diabetes(T2D).South Asia has a high T2D burden,and many studies have reported varying prevalence rates of DD in this area.AIM To estimate the pooled prevalence of DD among patients with T2D in South Asia,as it is crucial for developing effective therapeutic strategies.METHODS This systematic review and meta-analysis included cross-sectional studies conducted in South Asian countries involving adults with T2D and reported the prevalence of DD.The studies were identified by searching multiple electronic databases and registries from the inception of each database to January 30,2025,using prespecified search terms.Four authors screened and extracted data independently.Meta-analyses were conducted using RStudio software with a random-effects model.The primary outcome was the pooled prevalence of DD.RESULTS Thirty-seven cross-sectional studies(28 from India,five from Bangladesh,and two each from Pakistan and Sri Lanka)with mostly high methodological quality involving 11500 subjects were included.The pooled prevalence of DD was 44%(95%confidence interval:35-53,I2=97.4%).The prevalence of DD was highest in Pakistan(85%),followed by India and Bangladesh(42%each),and Sri Lanka(25%).Emotional burden was the most prevalent form of DD(60%),followed by treatment regimen-related distress(51%),interpersonal distress(31%),and physician-related distress(17%).Meta-regression analysis revealed no significant associations between the prevalence of DD and publication year,sample size,proportion of females,age,duration of diabetes,insulin usage,glycated hemoglobin levels,or diabetic complications.CONCLUSION South Asians with T2D seem to experience a relatively high burden of DD,and the emotional burden is the most common form of DD in this area.Larger studies utilizing unique tools and involving a broader participant base from the region would provide better epidemiological data for effectively planning high-quality diabetes care in South Asian countries. 展开更多
关键词 Type 2 diabetes Diabetes distress South Asia PREVALENCE Systematic reviews
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Assembling S-scheme heterojunction between basic bismuth nitrate and bismuth tungstate with promoting charges’separation for accelerated photocatalytic sulfamethazine degradation 被引量:2
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作者 Wenhan Chen Meng Dai +3 位作者 Li Xiang Shan Zhao Shuguang Wang Zuoli He 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第4期185-197,共13页
The S-scheme heterojunction has garnered increasing attention due to its remarkable oxidation capacity and efficient separation of photogenerated carriers.In this study,a one-pot glycerol-assisted hydrothermal process... The S-scheme heterojunction has garnered increasing attention due to its remarkable oxidation capacity and efficient separation of photogenerated carriers.In this study,a one-pot glycerol-assisted hydrothermal process was utilized to successfully synthesize S-scheme heterojunction photocatalysts comprising basic bismuth nitrate(BBN)and bismuth tungstate(BWO).Interestingly,the BBN/BWO heterogeneous photo-catalysts exhibited the highest photocatalytic properties.The optimized product achieved the degradation of sulfamethazine(SMZ)within 1 h,with a kinetic constant(k)value of 0.05818 min^(−1).The degradation process was influenced significantly by·O^(2)−and h^(+)species.To determine the degradation pathway of SMZ in the presence of BBN/BWO-0.6,liquid chromatography-mass spectrometry(LC-MS)analysis was performed,which revealed a decrease in the toxicity of intermediates and products.The enhanced pho-tocatalytic activity can be attributed to the internal electric field(IEF)of the S-scheme heterojunction between BBN and BWO,effectively promoting the separation of photogenerated carriers.This research presents a viable approach for developing S-scheme heterojunctions in SMZ photodegradation and other environmental applications. 展开更多
关键词 PHOTOCATALYSIS S-scheme HETEROJUNCTION Bi_(2)WO_(6) SULFAMETHAZINE
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碳纤维复合材料纵梁承载与吸能特性研究 被引量:1
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作者 蔡计杰 宋显刚 +3 位作者 王明 孟令宽 惠述俭 罗剑岚 《合成纤维》 2024年第1期66-73,82,共9页
为验证某轨道交通车辆碳纤维复合材料纵梁的设计值是否满足实际工况要求,采用有限元分析,依据某轨道交通车辆纵梁运营工况的要求,设定了试件连接区域、加载工况及加载点,进行了100%和130%限制载荷试验以及两种工况下的极限载荷试验,并在... 为验证某轨道交通车辆碳纤维复合材料纵梁的设计值是否满足实际工况要求,采用有限元分析,依据某轨道交通车辆纵梁运营工况的要求,设定了试件连接区域、加载工况及加载点,进行了100%和130%限制载荷试验以及两种工况下的极限载荷试验,并在130%限制载荷试验基础上继续做破坏试验。试验结果显示:在限制载荷试验中,试件未发出明显的响声,试验结束后试件没有发生破坏、纤维分层、开裂等损伤现象,同时加载连接处未发生破坏,表明该试件满足轨道交通车辆实际运营工况要求;破坏试验加载至300%限制载荷,试件整体结构完好,表面未出现明显损伤,加载至500%限制载荷时,夹具出现破坏,试件目测完好无损,整体结构完好,表面未出现明显的损伤,表明该结构的碳纤维复合材料纵梁设计安全裕度较大。 展开更多
关键词 轨道交通 碳纤维复合材料 有限元仿真 限制载荷 破坏试验
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静电纺丝法聚酰亚胺纤维膜研究进展 被引量:4
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作者 张乐乐 李佳柠 +6 位作者 龙映雪 徐杨 田战战 朱家强 孙昊 李婷 宇平 《产业用纺织品》 2024年第4期20-26,共7页
聚酰亚胺(PI)作为一种高性能聚合物,因具有力学性能优异、热稳定性高、耐化学、耐辐射等特性而广泛应用。静电纺丝可连续生产比表面积大、孔隙率高和形貌可控的纳/微米级纤维。综述了静电纺丝法制备的PI纤维膜在油水分离、空气过滤、电... 聚酰亚胺(PI)作为一种高性能聚合物,因具有力学性能优异、热稳定性高、耐化学、耐辐射等特性而广泛应用。静电纺丝可连续生产比表面积大、孔隙率高和形貌可控的纳/微米级纤维。综述了静电纺丝法制备的PI纤维膜在油水分离、空气过滤、电池隔膜、树脂增韧、传感器、隔热材料等领域的研究现状和最新研究进展,分析了其应用优势和不足,概述了未来PI纳米纤维膜发展面临的挑战。研究为进一步拓宽静电纺丝法PI纳米纤维膜的应用提供参考。 展开更多
关键词 聚酰亚胺(PI)纤维 静电纺丝 纤维膜 应用
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夏布手工挽团纱机械化加工生产实践 被引量:1
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作者 张凤 王建斌 +1 位作者 周虎云 刘勇 《上海纺织科技》 2024年第6期39-41,共3页
针对夏布手工挽团纱纱线粗细不匀、易开叉、接头处易断裂,难于机械织造的问题,对其进行机械化加工。首先对夏布手工挽团纱进行软化,再进行加捻卷绕成形后络成锥形筒纱。由结果可知,纱线强力得到提高,卷装容量增加,减轻了换纱的劳动强度... 针对夏布手工挽团纱纱线粗细不匀、易开叉、接头处易断裂,难于机械织造的问题,对其进行机械化加工。首先对夏布手工挽团纱进行软化,再进行加捻卷绕成形后络成锥形筒纱。由结果可知,纱线强力得到提高,卷装容量增加,减轻了换纱的劳动强度,减少了退绕不畅造成的浪费,获得了适用于机械织造的仿夏布筒子纱,节约了人工成本,提高了织造效率。 展开更多
关键词 夏布手工挽团纱 加捻 卷绕成形 筒纱 工艺参数
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Postbiotics from Saccharomyces cerevisiae fermentation stabilize microbiota in rumen liquid digesta during grain-based subacute ruminal acidosis(SARA) in lactating dairy cows 被引量:2
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作者 Junfei Guo Zhengxiao Zhang +3 位作者 Le Luo Guan Ilkyu Yoon Jan C.Plaizier Ehsan Khafipour 《Journal of Animal Science and Biotechnology》 SCIE CAS CSCD 2024年第5期2059-2080,共22页
Background Subacute ruminal acidosis(SARA)is a common metabolic disorder of high yielding dairy cows,and it is associated with dysbiosis of the rumen and gut microbiome and host inflammation.This study evaluated the i... Background Subacute ruminal acidosis(SARA)is a common metabolic disorder of high yielding dairy cows,and it is associated with dysbiosis of the rumen and gut microbiome and host inflammation.This study evaluated the impact of two postbiotics from Saccharomyces cerevisiae fermentation products(SCFP)on rumen liquid associated microbiota of lactating dairy cows subjected to repeated grain-based SARA challenges.A total of 32 rumen cannulated cows were randomly assigned to 4 treatments from 4 weeks before until 12 weeks after parturition.Treatment groups included a Control diet or diets supplemented with postbiotics(SCFPa,14 g/d Original XPC;SCFPb-1X,19 g/d Nutri Tek;SCFPb-2X,38 g/d Nutri Tek,Diamond V,Cedar Rapids,IA,USA).Grain-based SARA challenges were conducted during week 5(SARA1)and week 8(SARA2)after parturition by replacing 20%DM of the base total mixed ration(TMR)with pellets containing 50%ground barley and 50%ground wheat.Total DNA from rumen liquid samples was subjected to V3–V416S r RNA gene amplicon sequencing.Characteristics of rumen microbiota were compared among treatments and SARA stages.Results Both SARA challenges reduced the diversity and richness of rumen liquid microbiota,altered the overall composition(β-diversity),and its predicted functionality including carbohydrates and amino acids metabolic pathways.The SARA challenges also reduced the number of significant associations among different taxa,number of hub taxa and their composition in the microbial co-occurrence networks.Supplementation with SCFP postbiotics,in particular SCFPb-2X,enhanced the robustness of the rumen microbiota.The SCFP supplemented cows had less fluctuation in relative abundances of community members when exposed to SARA challenges.The SCFP supplementation promoted the populations of lactate utilizing and fibrolytic bacteria,including members of Ruminococcaceae and Lachnospiraceae,and also increased the numbers of hub taxa during non-SARA and SARA stages.Supplementation with SCFPb-2X prevented the fluctuations in the abundances of hub taxa that were positively correlated with the acetate concentration,andα-andβ-diversity metrics in rumen liquid digesta.Conclusions Induction of SARA challenges reduced microbiota richness and diversity and caused fluctuations in major bacterial phyla in rumen liquid microbiota in lactating dairy cows.Supplementation of SCFP postbiotics could attenuate adverse effects of SARA on rumen liquid microbiota. 展开更多
关键词 Postbiotics Rumen microbiota Saccharomyces cerevisiae fermentation products SARA
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Design Improvements and Validation of a Novel Fully 3D Printed Analogue Lumbar Spine Motion Segment
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作者 Siril Teja Dukkipati Mark Driscoll 《Journal of Bionic Engineering》 SCIE EI CSCD 2024年第3期1388-1396,共9页
Spine biomechanical testing methods in the past few decades have not evolved beyond employing either cadaveric studies or finite element modeling techniques.However,both these approaches may have inherent cost and tim... Spine biomechanical testing methods in the past few decades have not evolved beyond employing either cadaveric studies or finite element modeling techniques.However,both these approaches may have inherent cost and time limitations.Cadaveric studies are the present gold standard for spinal implant design and regulatory approval,but they introduce significant variability in measurements across patients,often requiring large sample sizes.Finite element modeling demands considerable expertise and can be computationally expensive when complex geometry and material nonlinearity are introduced.Validated analogue spine models could complement these traditional methods as a low-cost and high-fidelity alternative.A fully 3D printable L-S1 analogue spine model with ligaments is developed and validated in this research.Rotational stiffness of the model under pure bending loading in flexion-extension,Lateral Bending(LB)and Axial Rotation(AR)is evaluated and compared against historical ex vivo and in silico models.Additionally,the effect of interspinous,intertransverse ligaments and the Thoracolumbar Fascia(TLF)on spinal stiffness is evaluated by systematic construction of the model.In flexion,model Range of Motion(ROM)was 12.92±0.11°(ex vivo:16.58°,in silico:12.96°)at 7.5Nm.In LB,average ROM was 13.67±0.12°at 7.5 Nm(ex vivo:15.21±1.89°,in silico:15.49±0.23°).Similarly,in AR,average ROM was 17.69±2.12°at 7.5Nm(ex vivo:14.12±0.31°,in silico:15.91±0.28°).The addition of interspinous and intertransverse ligaments increased both flexion and LB stiffnesses by approximately 5%.Addition of TLF showed increase in flexion and AR stiffnesses by 29%and 24%,respectively.This novel model can reproduce physiological ROMs with high repeatability and could be a useful open-source tool in spine biomechanics. 展开更多
关键词 Lumbar spine 3D printing Intervertebral disc Biomechanical testing Spine mechanics
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Synergistic Cu single-atoms and clusters on tubular carbon nitride for efficient photocatalytic performances
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作者 Yu-Xiao Feng Hui-Jun Yu +6 位作者 Tian-Guang Lu Zi-Ye Zheng Shuang Tian Li Xiang Shan Zhao Shu-Guang Wang Zuo-Li He 《Rare Metals》 SCIE EI CAS CSCD 2024年第11期5891-5904,共14页
Metal clusters or even single-atoms dispersed and anchored on the photocatalysts'surface can enhance photocatalytic performances on organic pollutant oxidation.Here,a simple photoreduction method was used to creat... Metal clusters or even single-atoms dispersed and anchored on the photocatalysts'surface can enhance photocatalytic performances on organic pollutant oxidation.Here,a simple photoreduction method was used to create atomically dispersed metal single-atoms/clusters(MSCs,M=Cu,Pd,Au and Ag)on P-modulated tubular carbon nitride(TCN).The obtained MSCs@TCN demonstrated excellent photocatalytic performances for the degradation of sulfamethazine(SMZ).In particular,the photocatalyst with 2 wt%Cu loading showed ultrahigh SMZ oxidation efficiency(k=0.06110 min^(-1)),almost three times that of TCN(k=0.02066 min^(-1)).It also shows excellent stability in the 5th-cycle measurements.The improved photocatalytic activity of the CuSCs@TCN is ascribed to the synergistic promotion of photogenerated charge separation by Cu single-atoms/clusters as active sites,accelerated charge transfer from bulk TCN to Cu sites through Cu-N_(x)interaction.Meanwhile,the active sites of Cu single-atoms/clusters could promote the production of·O_(2)^(-),which participates in organic oxidation with strong oxidizing holes(h^(+)).This strategy paves a new avenue for designing high-performance photocatalysts decorated with metal single-atoms and clusters. 展开更多
关键词 Carbon nitride PHOTOCATALYSIS Cu single-atom SULFAMETHAZINE Degradation
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Quantum-Edge Cloud Computing for IoT: Bridging the Gap between Cloud, Edge, and Quantum Technologies
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作者 Shahanaz Akter Md. Khairul Islam Bhuiyan +3 位作者 Md. Bahauddin Badhon Habib Md. Hasan Fatema Akter Mohammad Nahid Ul Islam 《Advances in Internet of Things》 2024年第4期99-120,共22页
The rapid expansion of the Internet of Things (IoT) has driven the need for advanced computational frameworks capable of handling the complex data processing and security challenges that modern IoT applications demand... The rapid expansion of the Internet of Things (IoT) has driven the need for advanced computational frameworks capable of handling the complex data processing and security challenges that modern IoT applications demand. However, traditional cloud computing frameworks face significant latency, scalability, and security issues. Quantum-Edge Cloud Computing (QECC) offers an innovative solution by integrating the computational power of quantum computing with the low-latency advantages of edge computing and the scalability of cloud computing resources. This study is grounded in an extensive literature review, performance improvements, and metrics data from Bangladesh, focusing on smart city infrastructure, healthcare monitoring, and the industrial IoT sector. The discussion covers vital elements, including integrating quantum cryptography to enhance data security, the critical role of edge computing in reducing response times, and cloud computing’s ability to support large-scale IoT networks with its extensive resources. Through case studies such as the application of quantum sensors in autonomous vehicles, the practical impact of QECC is demonstrated. Additionally, the paper outlines future research opportunities, including developing quantum-resistant encryption techniques and optimizing quantum algorithms for edge computing. The convergence of these technologies in QECC has the potential to overcome the current limitations of IoT frameworks, setting a new standard for future IoT applications. 展开更多
关键词 Quantum-Edge Cloud Computing (QECC) Internet of Things (IoT) Low Latency Quantum Computing (QC) Scalable Cloud Services
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Anaerobic digestion of process water from hydrothermal treatment processes: a review of inhibitors and detoxification approaches
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作者 Mei Zhou Kayode Taiwo +3 位作者 Han Wang Jean-Nepomuscene Ntihuga Largus T.Angenent Joseph G.Usack 《Bioresources and Bioprocessing》 2024年第1期635-654,共20页
Integrating hydrothermal treatment processes and anaerobic digestion(AD)is promising for maximizing resource recovery from biomass and organic waste.The process water generated during hydrothermal treatment contains h... Integrating hydrothermal treatment processes and anaerobic digestion(AD)is promising for maximizing resource recovery from biomass and organic waste.The process water generated during hydrothermal treatment contains high concentrations of organic matter,which can be converted into biogas using AD.However,process water also contains various compounds that inhibit the AD process.Fingerprinting these inhibitors and identifying suitable mitigation strategies and detoxification methods is necessary to optimize the integration of these two technologies.By examining the existing literature,we were able to:(1)compare the methane yields and organics removal efficiency during AD of various hydrothermal treatment process water;(2)catalog the main AD inhibitors found in hydrothermal treatment process water;(3)identify recalcitrant components limiting AD performance;and(4)evaluate approaches to detoxify specific inhibitors and degrade recalcitrant components.Common inhibitors in process water are organic acids(at high concentrations),total ammonia nitrogen(TAN),oxygenated organics,and N-heterocyclic compounds.Feedstock composition is the primary determinant of organic acid and TAN formation(carbohydrates-rich and protein-rich feedstocks,respectively).In contrast,processing conditions(e.g.,temperature,pressure,reaction duration)influence the formation extent of oxygenated organics and N-heterocyclic compounds.Struvite precipitation and zeolite adsorption are the most widely used approaches to eliminate TAN inhibition.In contrast,powdered and granular activated carbon and ozonation are the preferred methods to remove toxic substances before AD treatment.Currently,ozonation is the most effective approach to reduce the toxicity and recalcitrance of N and O-heterocyclic compounds during AD.Microaeration methods,which disrupt the AD microbiome less than ozone,might be more practical for nitrifying TAN and degrading recalcitrant compounds,but further research in this area is necessary. 展开更多
关键词 Hydrothermal treatment Process water Anaerobic digestion BIOGAS INHIBITION DETOXIFICATION
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新型冠状病毒感染相关疼痛 被引量:8
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作者 解小丽 林永健 +4 位作者 李斌飞 苏圣贤 林志光 杨源锋 GONG Jason 《中国疼痛医学杂志》 CAS CSCD 北大核心 2022年第10期733-738,共6页
目前研究表明,有相当一部分病人在感染新型冠状病毒同时或后期出现头痛、腹痛、关节痛、肌痛、骨痛和或神经病理性疼痛等相关症状。为了加强疼痛科医师对新型冠状病毒感染相关疼痛的认识,提高新型冠状病毒感染相关疼痛的诊断水平和完善... 目前研究表明,有相当一部分病人在感染新型冠状病毒同时或后期出现头痛、腹痛、关节痛、肌痛、骨痛和或神经病理性疼痛等相关症状。为了加强疼痛科医师对新型冠状病毒感染相关疼痛的认识,提高新型冠状病毒感染相关疼痛的诊断水平和完善相关治疗方案,本文将对新型冠状病毒感染相关疼痛的发病率、可能机制和影像学表现等方面进行综述,以期为临床有效预防和治疗新型冠状病毒感染相关疼痛提供参考。 展开更多
关键词 疼痛 新型冠状病毒 新型冠状病毒肺炎
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纵隔肿物活检小标本的获取与病理报告指南 被引量:1
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作者 付浩 中国胸腺瘤协作组全体成员 +7 位作者 Alberto Marchevsky Alex Marx Philipp Strobel Saul Suster Federico Venuta Mirella Marino Samuel Yousem Maureen Zakowski 《中国肺癌杂志》 CAS 北大核心 2014年第2期104-109,共6页
目前,胸腺恶性肿瘤治疗方案大多是根据术后病理确定,然而,多数临床治疗决策需要在术前通过活检小标本的病理报告来制定。所以,术前活检小标本的正确获取和病理解读对治疗决策的制定显得非常重要[1]。这些标本包括细针活检标本,带... 目前,胸腺恶性肿瘤治疗方案大多是根据术后病理确定,然而,多数临床治疗决策需要在术前通过活检小标本的病理报告来制定。所以,术前活检小标本的正确获取和病理解读对治疗决策的制定显得非常重要[1]。这些标本包括细针活检标本,带芯穿刺活检标本和手术切取活检标本[2-7]。由于胸腺肿瘤的病理诊断对组织的获取方法和获取量都有较高的要求,加之对病理的描述也没有统一的标准,使得小标本在诊断胸腺瘤方面存在诸多问题。为此,ITMIG在病理科医生和外科医生回顾相关文献和提出初步建议的基础上,经集体讨论制定了活检规范操作流程,提出了对纵隔肿物小活检标本处理和病理报告的建议。旨在为术前患者的治疗提供一个统一和具有循证医学证据的方法;同时,将有利于全球数据之间的比较和开展合作研究,充分利用医疗资源。 展开更多
关键词 肿物活检 术后病理 纵隔肿物 小标本 报告指南 肿瘤治疗方案 活检标本 循证医学证据
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