OBJECTIVE: To assess the diagnostic value of endoscopic pancreatic duct brushing in detecting mutation of the K-ras gene at codon 12 in cytologic specimens from patients with pancreatic cancer. METHODS: Thirty-five pa...OBJECTIVE: To assess the diagnostic value of endoscopic pancreatic duct brushing in detecting mutation of the K-ras gene at codon 12 in cytologic specimens from patients with pancreatic cancer. METHODS: Thirty-five patients treated at Changhai Hospital, Shanghai between 1999 and 2001 were enrolled. Their cells obtained by pancreatic duct brushing during endoscopic retrograde tholangiopancreatography (ERCP) were suspended with phosphate buffer solution (PBS). DNA of the cells was extracted and mutation of the K-ras gene at codon 12 detected by means of PCR-SSCP. RESULTS: The K-ras gene mutation rate of pancreatic cancer was 70%, which was higher than that of chronic pancreatitis (14%, P<0.05). K-ras gene mutation was not found in patients with pancreatic cystorcarcinoma and duodenum carcinoma. As to the location of pancreatic cancer, no significant difference was observed between the head, the body and tail. The sensitivity, specificity, accuracy of pancreatic duct brushing in detecting pancreatic cancer was 70%, 94%, and 83%, respectively. CONCLUSION: K-ras analysis of pancreatic brushing samples is helpful in the diagnosis of patients with early pancreatic cancer.展开更多
Preoperative cytologic brushing and biopsy under direct Vision withfiberoptic colonoscopy(FC)and postoperative histopathologic examination wereperformed in 147 patients who were suspected of suffering from carcinoma o...Preoperative cytologic brushing and biopsy under direct Vision withfiberoptic colonoscopy(FC)and postoperative histopathologic examination wereperformed in 147 patients who were suspected of suffering from carcinoma of co-lon.In FC cytologic brushing,128 cases were positive for malignancy(87.1percent),18 false-negative(12.2 percent)and only one false-positive(0.7 percent).In the 146 FC biopsy specimens,124 were positive for malignancy(84 4 percent)and 22 false-negative and no false-positive.Combination of FC cytologic brushingwith FC biopsy could raise the diagnostic rate of colonic carcinoma to 95.2% anddecrease false-negative and false-positive because the two methods may replenisheach other in sampling and observation.Cytologic brushing is most valuable tothe early diagnosis of colonic carcinoma.When colonic stricture and obstructionprevent the colonoscope from reaching the lesion and FC biopsy cannot bedone,FC cytologic brushing is an effective method for diagnosis.The positiverate and false-negative rate of the cytologic brushing did not correlate to grosstyping,histopathologic typing and Dukes staging(P】0.05).The factorsinfluencing the correct diagnosis of colonic carcinoma by FC cytologic brushingare discussed in this paper.展开更多
The effects of 3 chairside polishing kits and mechanical brushing on the surface roughness of 3 different acrylic denture base resins were compared. Acrylic denture base resins （auto-polymerizing, heat-polymerizing, ...The effects of 3 chairside polishing kits and mechanical brushing on the surface roughness of 3 different acrylic denture base resins were compared. Acrylic denture base resins （auto-polymerizing, heat-polymerizing, injected heat-polymerizing resins） were examined after a tungsten carbide bur, and after chairside polishing using 3 polishing kits and pumice. The specimens were subjected to mechanical brushing using a wear tester to simulate 30 000 strokes of brushing. The surface roughness of the acrylic denture base resin specimens was measured using a contact pro-filometer. After the test, the random polished acrylic resins were evaluated by scanning electron mi-croscopy （SEM） and atomic force microscopy （AFM）. Acrylic denture base resins polished using the 3 types of polishing kits had a smoother surface than those finished with the tungsten carbide bur （p〈0.05）. The surface of the resin polished by a TC cutter exceeded the Ra of 0.2 μm （p〈0.05）. The auto-polymerizing resin showed a significantly higher surface roughness than the heat-polymerizing resin and injected heat-polymerizing resin （p〉0.05）. In the case of polishing step wise, there was almost no change in surface roughness after brushing （p〉0.05）.展开更多
Introduction and Objective: The aim of this research was to find out the interaction of anthropometric measurements particularly body mass and oral health status of Turkish young adult nationals regionally, depending ...Introduction and Objective: The aim of this research was to find out the interaction of anthropometric measurements particularly body mass and oral health status of Turkish young adult nationals regionally, depending on the effects of diet (food and fluid consumption), smoking and tooth brushing habits, which were determined by using the body mass index (BMI) and dental health index (DMFT). Material and Methods: The BMI and DMFT of 202 cases, with an age average 22.5 years, were recorded through physical and clinical examinations. Statistical evaluation of the data was checked by Cronbach’s Alpha Reliability Scale and performed by analysis of variance, Somer’s d and Pearson Chi-Square statistics, Poisson Regression and Odds Ratio analysis. Results: The results showed that the mean of BMI was at the optimum level (21.52) for all cases. The DMFT was higher for underweight females and for overweight males. The mean of DMFT according to sexes seemingly had no significant difference;however, females had 8.6% more DMFT than males. When the risk factors of dental caries were evaluated, the DMFT was found as 19.3% more for cases consuming high carbohydrate foods, 4.5% more for high beverage consumption and 18% more for smokers. Conclusions: In conclusion, tooth brushing 3 or more times a day is necessary to decrease the DMFT and tooth brushing 3 times a day as opposed to 1 or 2 times shows significant difference regarding oral health.展开更多
Take care of your hair to help it stay clean,strong and healthy.Wash your hair when it gets dirty,but not too often.For most people,that means every two to three days.People with oily hair wash it every one to two day...Take care of your hair to help it stay clean,strong and healthy.Wash your hair when it gets dirty,but not too often.For most people,that means every two to three days.People with oily hair wash it every one to two days.Use a brush or comb to keep your hair neat and smooth.It's also important to be gentle so you don't pull or break your hair.Never go to bed with wet hair.It can break easily when you sleep.Dry it before bed!展开更多
Background:Tissue specimens for nasopharyngeal carcinoma(NPC)research are scarce because of sampling dif-ficulties.Previous studies have suggested non-invasive nasopharyngeal brushing as an effective sampling method f...Background:Tissue specimens for nasopharyngeal carcinoma(NPC)research are scarce because of sampling dif-ficulties.Previous studies have suggested non-invasive nasopharyngeal brushing as an effective sampling method for NPC diagnosis.The present study aimed to evaluate the feasibility of nasopharyngeal brushing in the acquisition of NPC nucleic acids for research.Methods:Nasopharyngeal brushing samples were acquired from 24 healthy individuals and 48 NPC patients.Tissues from 48 NPC and 18 nasopharyngitis patients were collected by endoscopic biopsy.The expression levels of tumor suppressor genes(TSGs)and Epstein-Barr virus(EBV)-encoded microRNAs as well as EBV DNA copy number were measured by quantitative polymerase chain reaction in both types of samples.Results:Among six TSGs examined,the expression levels of two genes were significantly decreased in nasopharyn-geal brushing and tissue samples from NPC patients as compared with those from healthy/nasopharyngitis indi-viduals.Four EBV-encoded microRNAs,mir-bart1-5p,mir-bart5,mir-bart6-5p,and mir-bart17-5p,were significantly up-regulated in both NPC brushing and tissue samples compared with those from healthy/nasopharyngitis controls(P<0.001).EBV DNA was significantly increased in both nasopharyngeal brushing samples(P<0.001)and tissue sam-ples(P<0.001)from NPC patients in comparison with those from healthy controls.Conclusions:Nasopharyngeal brushing can obtain sufficient tumoral materials for the analysis of viral nucleic acid,including EBV-encoded microRNAs and EBV DNA.For the detection of TSG expression,nasopharyngeal brushings was feasible but inferior to tissue samples.This study confirms nasopharyngeal brushing as an applicable sampling method that can aid in nucleic acid-based NPC research.展开更多
Currently,zinc anodes are facing problems such as the growth of zinc dendrites and the frequent occurrence of side reactions,while existing additive strategies are still challenging due to the poor stability of the ad...Currently,zinc anodes are facing problems such as the growth of zinc dendrites and the frequent occurrence of side reactions,while existing additive strategies are still challenging due to the poor stability of the adsorption layer and the ambiguous mechanisms of action.In this study,a highly stable Vani molecular brush additive was designed.The additive effectively inhibits H_(2) generation by targeting and anchoring H+in the inner Helmholtz layer,and reduces the water activity by constructing an enhanced hydrogen bonding network through the interaction with water molecules,thus inhibiting the parasitic side reactions on the zinc anode.In addition,the dynamic interfacial molecular layer can regulate and buffer the interfacial Zn^(2+)for highly reversible plating/stripping.Experiments show that the symmetric cell cycle life is as long as 3760 h at a Vani content of only 2×10^(-3) g L^(-1) with a current density of5 mA cm^(-2).The cycle life of the Zn‖MnO_(2) and Zn‖Zn_(0.58)V_(2)O_(5) H_(2)O full battery is significantly improved.This study deepens the understanding of the working mechanism of the zinc electrode interface and provides new ideas for non-sacrififcial trace additive design.展开更多
In the training studio of the School of Architecture and Engineering at Xizang Vocational Technical College,Lhasa,Gyatso,a senior artist specializing in Tibetan-style architectural decorative painting,bent over to dem...In the training studio of the School of Architecture and Engineering at Xizang Vocational Technical College,Lhasa,Gyatso,a senior artist specializing in Tibetan-style architectural decorative painting,bent over to demonstrate a student how to paint.His left hand steadied the painting board,while his right hand held a brush pen to present the Tibetan-style painting technique of"blurring"-dipping the brush lightly into the pigment,spreading it from dark to light on the paper.The eight-petaled lotus,a symbol of auspiciousness,gradually took shape,blossoming with layers of vitality.展开更多
人类对人体奥秘的探索与了解尚处初级阶段。本文提出的一个问题就让我们感到新奇与愕然。洁齿与口腔卫生有助于抑制糖尿病: Gum(齿龈)disease may even be more important than obesity or age as a factorin the onset of diabetes in ...人类对人体奥秘的探索与了解尚处初级阶段。本文提出的一个问题就让我们感到新奇与愕然。洁齿与口腔卫生有助于抑制糖尿病: Gum(齿龈)disease may even be more important than obesity or age as a factorin the onset of diabetes in adults。 上句可译:就诱发成年人糖尿病的因素而言,齿龈疾病也许比肥胖和年龄这两个因素更为重要。 因此,我们有必要认识:the importance of prevention and early treatment ofgum disease in people who are at risk of developing diabetes。 本文对inflammation([医]炎症,发炎)提出了一个颇有原创性的观点:…heart disease has a substantial inflammatory component。】展开更多
What damage can be done to teeth by over-brushing?The enamel of the teeth ran he worn out;the gum can he hurt by over-brushing.And your teeth will feel sensitive if the enamel gets thinner and/or the gum recedes.How o...What damage can be done to teeth by over-brushing?The enamel of the teeth ran he worn out;the gum can he hurt by over-brushing.And your teeth will feel sensitive if the enamel gets thinner and/or the gum recedes.How often should we be brushing our teeth?Two to three rimes a day.What is the recommended amount of time people should spend brushing their teeth?展开更多
A polarization-sensitive and flexible photodetector was fabricated through the precise alignment of perovskite nanowires(NWs)using a brush coating technique.The alignment of the NWs was meticulously examined,consideri...A polarization-sensitive and flexible photodetector was fabricated through the precise alignment of perovskite nanowires(NWs)using a brush coating technique.The alignment of the NWs was meticulously examined,considering various chemical properties of the solvent,such as boiling point,viscosity,and surface tension.Notably,when the NWs were brush-coated with toluene dispersion,the NWs were aligned in higher order than those processed from octane dispersion.The degree of alignment was correlated with the photodetector property.Especially,the well-aligned NW photodetector exhibited a two-fold disparity in current response contingent on the polarization direction.Furthermore,even after enduring 500 bending cycles,the device retained 80%of its photodetector performance.This approach underscores the potential of solution-processed flexible photodetectors for advanced optical applications under dynamic operating conditions.展开更多
Hello,everyone!I am Cici.I had a summer holiday that was both busy and happy.From July 11th to July 20th,I went to school every day to learn traditional Chinese painting.The soft brushes glided across the paper,creati...Hello,everyone!I am Cici.I had a summer holiday that was both busy and happy.From July 11th to July 20th,I went to school every day to learn traditional Chinese painting.The soft brushes glided across the paper,creating beautiful and vivid images.展开更多
Strong polyelectrolyte brushes(SPBs)play an important role in enabling material surface functionalization due to their unique stimuli-responsive properties.Although the unexpected pH responsiveness of SPBs has been re...Strong polyelectrolyte brushes(SPBs)play an important role in enabling material surface functionalization due to their unique stimuli-responsive properties.Although the unexpected pH responsiveness of SPBs has been revealed in the past ten years,it is still unclear if the pH-responsive properties of SPBs are affected by the brush thickness.In this study,we employed the positively charged poly[2-(methacryloyloxy)ethyl]trimethylammonium chloride(PMETAC)and negatively charged sodium poly(styrenesulfonate)(NaPSS)brushes as model systems to explore the effect of thickness on the pH-responsive properties of SPBs.The results demonstrate that the pH-responsive properties of SPBs manifest different dependences on the brush thickness.Specifically,for both PMETAC and NaPSS brushes,the pH-responsive hydration and stiffness are influenced by the thickness,and the pH-responsive wettability and adhesion are almost unaffected by the thickness.This work not only provides a clear understanding of the relationship between the brush thickness and the pH responsiveness of SPBs,but also offers a new method to control the pH-responsive properties of SPBs.展开更多
一、阅读理解[核心素养·文化意识](2024·贵州铜仁一模) The brush pen, one of the “Four Treasures of the Study”, was invented thou-sands of years ago. However, the oldest pen was just a stick or a piece of bamb...一、阅读理解[核心素养·文化意识](2024·贵州铜仁一模) The brush pen, one of the “Four Treasures of the Study”, was invented thou-sands of years ago. However, the oldest pen was just a stick or a piece of bamboo. It was difficult for people to write well on thin silk.展开更多
Both the Todo Alphabet written with bambuu pen that is kept by Burintögs Khagai in County Zhaosu and the one written with soft brush that is kept by Namrjil Vjar have distinct characteristics in symbols for vowel...Both the Todo Alphabet written with bambuu pen that is kept by Burintögs Khagai in County Zhaosu and the one written with soft brush that is kept by Namrjil Vjar have distinct characteristics in symbols for vowels,consonants,terminal letters and transcription letters.The two of them fundamentally adhered to the orthography established by Zaya Pandida and most likely were compiled in the transitional phase of the todo script.展开更多
Amphiphilic asymmetric brush copolymers(AABCs)possess unique self-assembly behaviors owing to their asymmetric brush architecture and multiple functionalities of multicomponent side chains.However,the synthesis of AAB...Amphiphilic asymmetric brush copolymers(AABCs)possess unique self-assembly behaviors owing to their asymmetric brush architecture and multiple functionalities of multicomponent side chains.However,the synthesis of AABCs presents challenges,which greatly limits the exploration of their self-assembly behaviors.In this work,we employed dissipative particle dynamics(DPD)simulations to investigate the self-assembly behaviors of AABCs in selective solution.By varying the copolymer concentration and structure,we conducted the self-assembly phase diagrams of AABCs,revealing complex morphologies such as channelized micelles with one or more solvophilic channels.Moreover,the number,surface area,and one-dimensional density distribution of the channelized micelles were calculated to demonstrate the internal structure and morphological transformation during the self-assembly process.Our findings indicate that the morphology of the internal solvophilic channels is greatly influenced by the copolymer structure,concentration,and interaction parameters between the different side chains.The simulation results are consistent with available experimental observations,which can offer theoretical insights into the self-assembly of AABCs.展开更多
Road sweeping is an essential service that has to be conducted for public health,as well as aesthetic purposes.In many countries,sweeping vehicles are used for this activity.They usually comprise a gutter brush that s...Road sweeping is an essential service that has to be conducted for public health,as well as aesthetic purposes.In many countries,sweeping vehicles are used for this activity.They usually comprise a gutter brush that sweeps the debris that is located in the road gutter.This work studies the performance of two kinds of gutter brushes:a cutting brush and a flicking(F128)brush.This is carried out by means of a 3-D dynamic,nonlinear Finite Element(FE)brush model developed by the authors.In this model,inertia forces are applied to the bristle,and its clamped end is fixed.Consequently,the surface(road)is rotated,translated,and raised.Bristle-road interaction is modelled as flexible-to-rigid contact.In particular,the aim of this article is to compare the performance of a conventional brush and a brush rotating at variable speed.As brushes normally work tilted,FE analyses are carried out for tilted cutting and F128 brushes,rotating at speeds that fluctuate at different frequencies.It is concluded that brush oscillations have a significant effect on bristle tip velocities and bristle-road forces.Also,at certain frequencies,oscillations seem to improve sweeping performance of the F128 brush.However,they do not appear to improve significantly the performance of the cutting brush.展开更多
文摘OBJECTIVE: To assess the diagnostic value of endoscopic pancreatic duct brushing in detecting mutation of the K-ras gene at codon 12 in cytologic specimens from patients with pancreatic cancer. METHODS: Thirty-five patients treated at Changhai Hospital, Shanghai between 1999 and 2001 were enrolled. Their cells obtained by pancreatic duct brushing during endoscopic retrograde tholangiopancreatography (ERCP) were suspended with phosphate buffer solution (PBS). DNA of the cells was extracted and mutation of the K-ras gene at codon 12 detected by means of PCR-SSCP. RESULTS: The K-ras gene mutation rate of pancreatic cancer was 70%, which was higher than that of chronic pancreatitis (14%, P<0.05). K-ras gene mutation was not found in patients with pancreatic cystorcarcinoma and duodenum carcinoma. As to the location of pancreatic cancer, no significant difference was observed between the head, the body and tail. The sensitivity, specificity, accuracy of pancreatic duct brushing in detecting pancreatic cancer was 70%, 94%, and 83%, respectively. CONCLUSION: K-ras analysis of pancreatic brushing samples is helpful in the diagnosis of patients with early pancreatic cancer.
文摘Preoperative cytologic brushing and biopsy under direct Vision withfiberoptic colonoscopy(FC)and postoperative histopathologic examination wereperformed in 147 patients who were suspected of suffering from carcinoma of co-lon.In FC cytologic brushing,128 cases were positive for malignancy(87.1percent),18 false-negative(12.2 percent)and only one false-positive(0.7 percent).In the 146 FC biopsy specimens,124 were positive for malignancy(84 4 percent)and 22 false-negative and no false-positive.Combination of FC cytologic brushingwith FC biopsy could raise the diagnostic rate of colonic carcinoma to 95.2% anddecrease false-negative and false-positive because the two methods may replenisheach other in sampling and observation.Cytologic brushing is most valuable tothe early diagnosis of colonic carcinoma.When colonic stricture and obstructionprevent the colonoscope from reaching the lesion and FC biopsy cannot bedone,FC cytologic brushing is an effective method for diagnosis.The positiverate and false-negative rate of the cytologic brushing did not correlate to grosstyping,histopathologic typing and Dukes staging(P】0.05).The factorsinfluencing the correct diagnosis of colonic carcinoma by FC cytologic brushingare discussed in this paper.
文摘The effects of 3 chairside polishing kits and mechanical brushing on the surface roughness of 3 different acrylic denture base resins were compared. Acrylic denture base resins （auto-polymerizing, heat-polymerizing, injected heat-polymerizing resins） were examined after a tungsten carbide bur, and after chairside polishing using 3 polishing kits and pumice. The specimens were subjected to mechanical brushing using a wear tester to simulate 30 000 strokes of brushing. The surface roughness of the acrylic denture base resin specimens was measured using a contact pro-filometer. After the test, the random polished acrylic resins were evaluated by scanning electron mi-croscopy （SEM） and atomic force microscopy （AFM）. Acrylic denture base resins polished using the 3 types of polishing kits had a smoother surface than those finished with the tungsten carbide bur （p〈0.05）. The surface of the resin polished by a TC cutter exceeded the Ra of 0.2 μm （p〈0.05）. The auto-polymerizing resin showed a significantly higher surface roughness than the heat-polymerizing resin and injected heat-polymerizing resin （p〉0.05）. In the case of polishing step wise, there was almost no change in surface roughness after brushing （p〉0.05）.
文摘Introduction and Objective: The aim of this research was to find out the interaction of anthropometric measurements particularly body mass and oral health status of Turkish young adult nationals regionally, depending on the effects of diet (food and fluid consumption), smoking and tooth brushing habits, which were determined by using the body mass index (BMI) and dental health index (DMFT). Material and Methods: The BMI and DMFT of 202 cases, with an age average 22.5 years, were recorded through physical and clinical examinations. Statistical evaluation of the data was checked by Cronbach’s Alpha Reliability Scale and performed by analysis of variance, Somer’s d and Pearson Chi-Square statistics, Poisson Regression and Odds Ratio analysis. Results: The results showed that the mean of BMI was at the optimum level (21.52) for all cases. The DMFT was higher for underweight females and for overweight males. The mean of DMFT according to sexes seemingly had no significant difference;however, females had 8.6% more DMFT than males. When the risk factors of dental caries were evaluated, the DMFT was found as 19.3% more for cases consuming high carbohydrate foods, 4.5% more for high beverage consumption and 18% more for smokers. Conclusions: In conclusion, tooth brushing 3 or more times a day is necessary to decrease the DMFT and tooth brushing 3 times a day as opposed to 1 or 2 times shows significant difference regarding oral health.
文摘Take care of your hair to help it stay clean,strong and healthy.Wash your hair when it gets dirty,but not too often.For most people,that means every two to three days.People with oily hair wash it every one to two days.Use a brush or comb to keep your hair neat and smooth.It's also important to be gentle so you don't pull or break your hair.Never go to bed with wet hair.It can break easily when you sleep.Dry it before bed!
基金supported by the Major International Cooperation Projects of the National Natural Science Foundation of China(No.81220108022)the National Natural Science Funds for Distinguished Young Scholars(No.81325018)+3 种基金the National Key Research and Development Program(No.2016YFC1302704)Guangdong Special Support Programs for High-level Personnel(No.2014TX01R201)the Science and Technology Project of Guangdong Province(No.2014B050504004)the Health&Medical Collaborative Innovation Project of Guangzhou City(No.201604020003).
文摘Background:Tissue specimens for nasopharyngeal carcinoma(NPC)research are scarce because of sampling dif-ficulties.Previous studies have suggested non-invasive nasopharyngeal brushing as an effective sampling method for NPC diagnosis.The present study aimed to evaluate the feasibility of nasopharyngeal brushing in the acquisition of NPC nucleic acids for research.Methods:Nasopharyngeal brushing samples were acquired from 24 healthy individuals and 48 NPC patients.Tissues from 48 NPC and 18 nasopharyngitis patients were collected by endoscopic biopsy.The expression levels of tumor suppressor genes(TSGs)and Epstein-Barr virus(EBV)-encoded microRNAs as well as EBV DNA copy number were measured by quantitative polymerase chain reaction in both types of samples.Results:Among six TSGs examined,the expression levels of two genes were significantly decreased in nasopharyn-geal brushing and tissue samples from NPC patients as compared with those from healthy/nasopharyngitis indi-viduals.Four EBV-encoded microRNAs,mir-bart1-5p,mir-bart5,mir-bart6-5p,and mir-bart17-5p,were significantly up-regulated in both NPC brushing and tissue samples compared with those from healthy/nasopharyngitis controls(P<0.001).EBV DNA was significantly increased in both nasopharyngeal brushing samples(P<0.001)and tissue sam-ples(P<0.001)from NPC patients in comparison with those from healthy controls.Conclusions:Nasopharyngeal brushing can obtain sufficient tumoral materials for the analysis of viral nucleic acid,including EBV-encoded microRNAs and EBV DNA.For the detection of TSG expression,nasopharyngeal brushings was feasible but inferior to tissue samples.This study confirms nasopharyngeal brushing as an applicable sampling method that can aid in nucleic acid-based NPC research.
基金supported by the Heilongjiang Province“Double First Class”Discipline Collaborative Innovation Project(LJGXCG2023-061)。
文摘Currently,zinc anodes are facing problems such as the growth of zinc dendrites and the frequent occurrence of side reactions,while existing additive strategies are still challenging due to the poor stability of the adsorption layer and the ambiguous mechanisms of action.In this study,a highly stable Vani molecular brush additive was designed.The additive effectively inhibits H_(2) generation by targeting and anchoring H+in the inner Helmholtz layer,and reduces the water activity by constructing an enhanced hydrogen bonding network through the interaction with water molecules,thus inhibiting the parasitic side reactions on the zinc anode.In addition,the dynamic interfacial molecular layer can regulate and buffer the interfacial Zn^(2+)for highly reversible plating/stripping.Experiments show that the symmetric cell cycle life is as long as 3760 h at a Vani content of only 2×10^(-3) g L^(-1) with a current density of5 mA cm^(-2).The cycle life of the Zn‖MnO_(2) and Zn‖Zn_(0.58)V_(2)O_(5) H_(2)O full battery is significantly improved.This study deepens the understanding of the working mechanism of the zinc electrode interface and provides new ideas for non-sacrififcial trace additive design.
文摘In the training studio of the School of Architecture and Engineering at Xizang Vocational Technical College,Lhasa,Gyatso,a senior artist specializing in Tibetan-style architectural decorative painting,bent over to demonstrate a student how to paint.His left hand steadied the painting board,while his right hand held a brush pen to present the Tibetan-style painting technique of"blurring"-dipping the brush lightly into the pigment,spreading it from dark to light on the paper.The eight-petaled lotus,a symbol of auspiciousness,gradually took shape,blossoming with layers of vitality.
文摘人类对人体奥秘的探索与了解尚处初级阶段。本文提出的一个问题就让我们感到新奇与愕然。洁齿与口腔卫生有助于抑制糖尿病: Gum(齿龈)disease may even be more important than obesity or age as a factorin the onset of diabetes in adults。 上句可译:就诱发成年人糖尿病的因素而言,齿龈疾病也许比肥胖和年龄这两个因素更为重要。 因此,我们有必要认识:the importance of prevention and early treatment ofgum disease in people who are at risk of developing diabetes。 本文对inflammation([医]炎症,发炎)提出了一个颇有原创性的观点:…heart disease has a substantial inflammatory component。】
文摘What damage can be done to teeth by over-brushing?The enamel of the teeth ran he worn out;the gum can he hurt by over-brushing.And your teeth will feel sensitive if the enamel gets thinner and/or the gum recedes.How often should we be brushing our teeth?Two to three rimes a day.What is the recommended amount of time people should spend brushing their teeth?
基金supported by a Commercialization Promotion Agency for R&D Outcomes(COMPA)Grant funded by the Korean Government(Ministry of Science and ICT)(No.RS-2023-00304743)the National Research Foundation of Korea(NRF)Grant funded by the Korean Government(MSIT)(No.2022M3J7A1066428)"Regional Innovation Strategy(RIS)"through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(MOE)(No.2023RIS-008).
文摘A polarization-sensitive and flexible photodetector was fabricated through the precise alignment of perovskite nanowires(NWs)using a brush coating technique.The alignment of the NWs was meticulously examined,considering various chemical properties of the solvent,such as boiling point,viscosity,and surface tension.Notably,when the NWs were brush-coated with toluene dispersion,the NWs were aligned in higher order than those processed from octane dispersion.The degree of alignment was correlated with the photodetector property.Especially,the well-aligned NW photodetector exhibited a two-fold disparity in current response contingent on the polarization direction.Furthermore,even after enduring 500 bending cycles,the device retained 80%of its photodetector performance.This approach underscores the potential of solution-processed flexible photodetectors for advanced optical applications under dynamic operating conditions.
文摘Hello,everyone!I am Cici.I had a summer holiday that was both busy and happy.From July 11th to July 20th,I went to school every day to learn traditional Chinese painting.The soft brushes glided across the paper,creating beautiful and vivid images.
基金financially supported by the National Natural Science Foundation of China(Nos.22273098,52033001 and 22303032)the Key Project of Anhui Province Science and Technology Innovation Platform(No.S202305a12020030)+1 种基金the Science and Technology Program Project of Zhejiang Province,China(No.2025ZY01057)partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication。
文摘Strong polyelectrolyte brushes(SPBs)play an important role in enabling material surface functionalization due to their unique stimuli-responsive properties.Although the unexpected pH responsiveness of SPBs has been revealed in the past ten years,it is still unclear if the pH-responsive properties of SPBs are affected by the brush thickness.In this study,we employed the positively charged poly[2-(methacryloyloxy)ethyl]trimethylammonium chloride(PMETAC)and negatively charged sodium poly(styrenesulfonate)(NaPSS)brushes as model systems to explore the effect of thickness on the pH-responsive properties of SPBs.The results demonstrate that the pH-responsive properties of SPBs manifest different dependences on the brush thickness.Specifically,for both PMETAC and NaPSS brushes,the pH-responsive hydration and stiffness are influenced by the thickness,and the pH-responsive wettability and adhesion are almost unaffected by the thickness.This work not only provides a clear understanding of the relationship between the brush thickness and the pH responsiveness of SPBs,but also offers a new method to control the pH-responsive properties of SPBs.
文摘一、阅读理解[核心素养·文化意识](2024·贵州铜仁一模) The brush pen, one of the “Four Treasures of the Study”, was invented thou-sands of years ago. However, the oldest pen was just a stick or a piece of bamboo. It was difficult for people to write well on thin silk.
文摘Both the Todo Alphabet written with bambuu pen that is kept by Burintögs Khagai in County Zhaosu and the one written with soft brush that is kept by Namrjil Vjar have distinct characteristics in symbols for vowels,consonants,terminal letters and transcription letters.The two of them fundamentally adhered to the orthography established by Zaya Pandida and most likely were compiled in the transitional phase of the todo script.
基金supported by the National Science Foundation for Distinguished Young Scholars(No.52325308)the National Natural Science Foundation of China(Nos.52273008 and 52073092)+1 种基金Shanghai Scientific and Technological Innovation Projects(No.22ZR1479300)Shanghai Rising-Star Program(No.23QA1402500).
文摘Amphiphilic asymmetric brush copolymers(AABCs)possess unique self-assembly behaviors owing to their asymmetric brush architecture and multiple functionalities of multicomponent side chains.However,the synthesis of AABCs presents challenges,which greatly limits the exploration of their self-assembly behaviors.In this work,we employed dissipative particle dynamics(DPD)simulations to investigate the self-assembly behaviors of AABCs in selective solution.By varying the copolymer concentration and structure,we conducted the self-assembly phase diagrams of AABCs,revealing complex morphologies such as channelized micelles with one or more solvophilic channels.Moreover,the number,surface area,and one-dimensional density distribution of the channelized micelles were calculated to demonstrate the internal structure and morphological transformation during the self-assembly process.Our findings indicate that the morphology of the internal solvophilic channels is greatly influenced by the copolymer structure,concentration,and interaction parameters between the different side chains.The simulation results are consistent with available experimental observations,which can offer theoretical insights into the self-assembly of AABCs.
文摘Road sweeping is an essential service that has to be conducted for public health,as well as aesthetic purposes.In many countries,sweeping vehicles are used for this activity.They usually comprise a gutter brush that sweeps the debris that is located in the road gutter.This work studies the performance of two kinds of gutter brushes:a cutting brush and a flicking(F128)brush.This is carried out by means of a 3-D dynamic,nonlinear Finite Element(FE)brush model developed by the authors.In this model,inertia forces are applied to the bristle,and its clamped end is fixed.Consequently,the surface(road)is rotated,translated,and raised.Bristle-road interaction is modelled as flexible-to-rigid contact.In particular,the aim of this article is to compare the performance of a conventional brush and a brush rotating at variable speed.As brushes normally work tilted,FE analyses are carried out for tilted cutting and F128 brushes,rotating at speeds that fluctuate at different frequencies.It is concluded that brush oscillations have a significant effect on bristle tip velocities and bristle-road forces.Also,at certain frequencies,oscillations seem to improve sweeping performance of the F128 brush.However,they do not appear to improve significantly the performance of the cutting brush.
