Industrial utilization of arsenic-containing gold dressing tailings as pellet prepared by straight grate process

The utilization of arsenic-containing gold dressing tailings is an urgent issue faced by gold production companies worldwide.The thermodynamic analysis results indicate that ferrous arsenate(FeAsO_(4)),pyrite(FeS_(2))and sodium cyanide(NaCN)in the arsenic-containing gold metallurgical tailings can be effectively removed using straight grate process,and the removal of pyrite and sodium cyanide is basically completed during the preheating stage,while the removal of ferrous arsenate requires the roasting stage.The pellets undergo a transformation from magnetite to hematite during the preheating process,and are solidified through micro-crystalline bonding and high-temperature recrystallization of hematite(Fe_(2)O_(3))during the roasting process.Ultimately,pellets with removal rates of 80.77% for arsenic,88.78% for sulfur,and 99.88% for cyanide are obtained,as well as the iron content is 61.1% and the compressive strength is 3071 N,meeting the requirements for blast furnace burden.This study provides an industrially feasible method for treating arsenic-containing gold smelting tailings,benefiting gold production enterprises.

Spatially engineering tri-layer nanofiber dressings featuring asymmetric wettability for wound healing

Inspired by the skin structure,an asymmetric wettability tri-layer nanofiber membrane(TNM)consisting of hydrophilic inner layer loaded with lidocaine hydrochloride(LID),hydrophobic middle layer with ciprofloxacin(CIP)and hydrophobic outer layer has been created.The hydrophobic outer layer endows the TNM with waterproof function and anti-adhesion from contaminants.The hydrophobic middle layer with CIP preserves long-term inhibition of bacteria growth and the hydrophilic inner layer with LID possesses optimal waterabsorbing capacity and air permeability.The TNM dramatically elevates the water contact angles from 10°(inner layer)to 120(outer layer),indicating an asymmetric wettability,which could directionally transport wound exudate within the materials and meanwhile maintain a comfortable and moist environment to promote wound healing.Furthermore,the sequential release of LID and CIP could relieve pain rapidly and achieve antibacterial effect in the long run,respectively.In addition,the TNM shows superior biocompatibility towards L929 cells.The in vivo results show the TNM could prevent infection,accelerate epithelial regeneration and significantly accelerate wound healing.This study indicates the developed TNM with asymmetrical wettability and synergetic drug release shows great potential as a wound dressing in clinical application.

Improving pressure ulcer care in intensive care units:Evaluating the impact of bundled care and silver nanoparticle dressings

BACKGROUND Pressure ulcer(PU)are prevalent among critically ill trauma patients,posing substantial risks.Bundled care strategies and silver nanoparticle dressings offer potential solutions,yet their combined effectiveness and impact on patient satisfaction remain insufficiently investigated.AIM To assess the impact of bundled care along with silver nanoparticle dressing on PUs management and family satisfaction in critically ill trauma patients.METHODS A total of 98 critically ill trauma patients with PUs in intensive care unit(ICU)were included in this study.Patients were randomly assigned to either the control group(conventional care with silver nanoparticle dressing,n=49)or the intervention group(bundled care with silver nanoparticle dressing,n=49).The PU Scale for Healing(PUSH)tool was used to monitor changes in status of pressure injuries over time.Assessments were conducted at various time points:Baseline(day 0)and subsequent assessments on day 3,day 6,day 9,and day 12.Family satisfaction was assessed using the Family Satisfaction ICU 24 ques-tionnaire.RESULTS No significant differences in baseline characteristics were observed between the two groups.In the intervention group,there were significant reductions in total PUSH scores over the assessment period.Specifically,surface area,exudate,and tissue type parameters all showed significant improvements compared to the control group.Family satisfaction with care and decision-making was notably higher in the intervention group.Overall family satisfaction was significantly better in the intervention group.CONCLUSION Bundled care in combination with silver nanoparticle dressings effectively alleviated PUs and enhances family satisfaction in critically ill trauma patients.This approach holds promise for improving PUs management in the ICU,benefiting both patients and their families.

Antibacterial and angiogenic dual-functional fibrous membrane dressing for infected wound healing

Background:Skin,being a vital organ that regulates physiological responses in the human body,is prone to injury from external environmental factors.Healing full-thickness skin defects becomes especially challenging when infections and vascular injuries are involved.Traditional wound dressings with single functions,such as antibacterial or angiogenic properties,fall short in achieving rapid wound healing.To address this,there is a need to develop wound dressing materials that possess both effective antibacterial and angiogenic properties.Methods:In this study,we utilized electrospinning technology to fabricate hyaluronic acid-cellulose acetate fibrous membrane dressings,incorporating poly(ionic liquid)as an antibacterial polymer and deferoxamine as an angiogenic agent.Results:The resulting fibrous membrane dressing contained poly(ionic liquid)and deferoxamin showcased a microporous structure,drug-releasing capabilities,and excellent air permeability.It not only demonstrated highly effective antibacterial properties but also exhibited remarkable angiogenesis,thereby promoting the healing of full-thickness skin defect wounds in both in vitro and in vivo assays.Conclusion:These findings highlight the immense potential of this wound dressing material for future clinical applications.

Janus hydrogel/electrospun-membrane dressing enhancing wound healing in rats

Background:Excessive exudate secreted from chronic wounds often leads to overhydration and infection.Although a variety of dressings are currently available in clinical applications,they frequently fail to provide multifunction to promote chronic wound healing.The dressings with a Janus structure,featuring distinct properties on each side,are potential to improve wound healing.Methods:Composite dressings with a Janus structure were fabricated,comprising freeze-dried polycaprolactone(PCL)electrospun membrane and alginate-based hydrogel.The PCL fibrous membrane provided air permeability,while the hydrogel loaded with Deferoxamine,composed of alginate and poly(N-isopropylacrylamide)(PNIPAM),exhibited hygroscopic properties.The inclusion of PNIPAM imparted thermo-responsivity.Results:The hydrogel(thickness of 2.778±0.082 mm)exhibited a robust adhesion to the fiber membrane(thickness of 0.261±0.041 mm).For ANDC(Alginate-PNIPAM hydrogel with Deferoxamine/PCL membrane)samples,the water vapor transmission rate(WVTR)was measured to be 3364.80±23.23 g∙m−2∙day−1 and the swelling ratio at 2 h was determined to be 1179±125%.The thermo-responsivity of ANDC samples manifested in an increased swelling rate,escalating from 797±189%at 37°C to 1132±147%at 4°C.The elastic modulus was assessed for lyophilized and rehydrated ANDC sample.When theωof the rheometer rotor was decreased from 10 rad/s to 0.1 rad/s,the lyophilized dressing exhibited a decrease from 2.65±0.01 MPa to 1.80±0.90 MPa,while the rehydrated dressing demonstrated an increase from 133.65±55.68 Pa to 264.23±141.71 Pa.The pro-healing properties of the dressings were evaluated using full-thickness skin defect model on SD rats,and a circular wound of diameter 10 mm healed completely by day 12.Conclusion:The dressings not only protected the wound and absorbed excess exudate,but also demonstrated nondestructive peelability upon cooling,providing a novel approach for accelerating wound healing and management.

以DRESS综合征就诊的血管免疫母细胞性T细胞淋巴瘤一例

血管免疫母细胞性T细胞淋巴瘤(angioimmunoblastic T-cell lymphoma, AITL)是外周T细胞淋巴瘤(peripheral T cell lymphoma, PTCL)的亚型之一,占所有非霍奇金淋巴瘤(non-Hodgkin lymphoma, NHL)病例的1%~2%。某些情况下,该疾病与DRESS综合征难以鉴别,在本文中,我们报道皮损表现似DRESS综合征的老年女性AITL患者一例。

树突状细胞经cross-dressing递呈抗原在肿瘤免疫中的应用

cross-dressing是树突状细胞(DC)区别于交叉递呈和直接递呈的第三种抗原递呈方式,其优势在于DC捕获细胞抗原肽-MHCⅠ类分子复合物后,无须经过加工处理而直接递呈给效应T细胞。近十年来,cross-dressing在肿瘤免疫领域的研究取得了一些成果,学者们利用小鼠和人源性细胞模型证实cross-dressing存在于不同肿瘤抗原识别和免疫应答过程,初步阐明了cross-dressing的具体途径和DC分子表型,并研究了cross-dressing与交叉递呈的关系。本文就上述问题进行了综述。

四环素类药物致DRESS综合征的文献分析

目的分析四环素类药物致伴嗜酸性粒细胞增多和系统症状的药疹综合征(DRESS综合征)的发生情况及特点,为临床安全合理用药提供参考。方法通过检索中国知网(CNKI)、万方(WanFang)、维普(VIP)、PubMed、The Cochrane Library、Embase等数据库,查找自建库至2022年11月30日期间四环素类药物导致DRESS综合征的文献,筛选出符合标准的病例进行统计和分析。结果共收集到有效文献29篇,涉及患者32例,男性9例(28.13%),女性23例(71.87%);30岁以下20例;原发疾病主要为痤疮(19例);致敏药物29例为米诺环素(90.63%),3例为多西环素(9.37%);四环素类药物致DRESS综合征的潜伏期均值为(27.35±13.76)d,24例患者在用药14 d之后出现不良反应;临床症状主要表现为皮疹、发热、面部水肿、淋巴结肿大、嗜酸性粒细胞增高及内脏受累,最常见受累的器官为肝脏(23例),其次是心脏(12例)。32例患者中21例在予以皮质内固醇等药物治疗后好转;1例好转后复发,1例好转后皮质内固醇戒断失败;6例患者死亡,其中4例死于DRESS综合征导致的心脏受累,2例死于多器官衰竭;3例患者治愈后出现自身免疫性后遗症,其中2例同时出现甲状腺功能障碍和1型糖尿病,1例出现1型糖尿病。结论四环素类药物致DRESS综合征的病死率较高,尤其是米诺环素诱发的心脏受累对患者危害极大,临床上应加强用药监测,此外DRESS综合征引发的自身免疫性疾病也需要引起关注。

超真实与内爆:拟像理论下DRESS X虚拟时尚平台的虚实关系探析

近年来,元宇宙概念的兴起带动了DRESSX虚拟时尚平台的发展,DRESSX虚拟时尚平台现已成为世界上最大的数字化服装零售平台。基于让·鲍德里亚的拟像理论,以DRESSX虚拟时尚平台为研究对象,从虚拟服装物质性消失、虚拟场景突破现实枷锁、虚拟化身仿真现实人三个维度映射超真实的现实世界。网络技术的全面渗透促使整个虚拟时尚平台发生内爆,以意义的内爆、媒介的内爆、社会的内爆三个方面消解虚实边界。最后,DRESS X虚拟时尚平台作为新兴平台,目前存在法律不健全、用户非理性消费等问题。

Design of Novel Wound Dressing Composed of Collagen and Hyaluronic Acid Containing Epidermal Growth Factor

This research aims to develop a wound dressing composed of collagen (Col) and hyaluronic acid (HA) containing epidermal growth factor (EGF). First important issue is to contain EGF in the wound dressing in a stable state. The sheet-shaped sponge was manufactured by freeze-vacuum drying an aqueous solution of Col. Both sides of sponge were treated with ultraviolet (UV) irradiation to introduce intermolecular cross links between collagen molecules. This sponge was named Sponge-Col. Another sheet-shaped sponge was manufactured by freeze-vacuum drying an aqueous solution of HA containing EGF. This sponge was named Sponge-HA/EGF. The wound dressing was manufactured by laminating Sponge-Col on the top, Sponge-HA/EGF in the middle, and Sponge-Col on the bottom to create a sandwich structure. This method can prevent the reducing of EGF activity due to UV irradiation for intermolecular cross-linking. Second important issue is to enable gradual release of EGF from the wound dressing. The elution behavior of this wound dressing was investigated by measuring the weight change after immersion in water for a predetermined time. This wound dressing showed initially fast elution and subsequent very slow elution properties. The upper layer and lower layer Sponge-Col enabled gradual release of the middle layer Sponge-HA/EGF. This result suggests that EGF contained in the wound dressing is gradually released together with HA from the wound dressing. Third important issue is to provide moist wound-healing environment. The upper layer and lower layer Sponge-Col can provide the wound dressing with high water absorption and long-term water retention properties.

Is it possible to get fruits and dresses from a plant?

Would you eat a vitamin-rich black strawberry from a plant that has also produced your little black dress?The research comes from a project that Carole Collet,a professor of the Textile Futures Research Centre at Central Saint Martins College in London,has been working on Biolace,a research that connects textiles,food production and sustainability since years.Her research targets the year 2050 and beyond.By anticipating future key socio-economic factors and technological timelines,she aims at impacting today’s design directions so as to enable a more resilient and sustainable future.

Problem-Based Learning(PBL)Teaching Design in Enhancing College Students’Innovation Ability:Taking the Traditional Dress Design Course as An Example

This paper combines the cultivation of innovation ability with the content of problem-based learning(PBL),analyzes the current situation of the traditional dress design course,discusses the problems existing in the cultivation of innovation ability of college and university traditional dress design,and searches for the strategies to improve students’innovation ability based on PBL.This paper argues that PBL can provide assistance to the teaching design of traditional dress design courses,which is conducive to improving students’innovation ability in traditional dress design and realizing the desired teaching effect.

Curative Effect of 30% Supramolecular Salicylic Acid Combined with Yufa Spray Dressing on Moderate to Severe Scalp Seborrheic Dermatitis

Objective:To observe the clinical efficacy of 30%supramolecular salicylic acid combined with Yufa spray dressing in the treatment of moderate to severe seborrheic dermatitis(seborrheic dermatitis of the scalp,SDS).Methods:From January 2020 to December 2021,150 patients with SDS,who were treated in the Dermatology Clinic of the First Affiliated Hospital of Xi’an Medical University,were randomly divided into two groups,a treatment group and a control group,with 75 cases in each group.The treatment group was given 30%supramolecular salicylic acid combined with Yufa spray dressing on the basis of external medicine given to the control group,while the control group was given oral medicine combined with external medicine.Results:The difference in scores of erythema,scales,pruritus,and folliculitis of the treatment group before and after treatment was significant(P<0.01),indicating that supramolecular salicylic acid combined with Yufa spray dressing can relieve the symptoms of SDS.The difference in scores of erythema of the control group before and after treatment was significant as well(P<0.05),indicating that traditional antibiotics are also effective in treating SDS;however,there was no significant difference(P>0.05)in the scores of other signs and symptoms,such as scales,pruritus,and folliculitis,before and after treatment,indicating that traditional antibiotics have no obvious curative effect on SDS.After 12 weeks of treatment,the improvement in erythema,scaling,and folliculitis was significantly greater in the treatment group compared with the control group(P<0.05).Curative effect comparison showed that the total effective rate of the treatment group was 80.00%,compared with 25.67%of the control group,and the difference was statistically significant(P<0.05).Conclusion:30%supramolecular salicylic acid combined with Yufa spray dressing can significantly improve the therapeutic effect in moderate to severe SDS;the recurrence rate is lower,the course of treatment is shorted,and patients generally feel better;thus,it is a new option for the treatment of dermatitis.

三能级原子Dressed态下的压缩

本文通过求解级联型三能级原子部分哈密顿量的本征值问题,得到自发辐射的级联型三能级原子的Dressed态。加入基态后,得到场方差一般表达式,并求出初始条件下的压缩最佳值。

Optimization of the Dressing Parameters in Cylindrical Grinding Based on a Generalized Utility Function

The existing studies, concerning the dressing process, focus on the major influence of the dressing conditions on the grinding response variables. However, the choice of the dressing conditions is often made, based on the experience of the qualified staff or using data from reference books. The optimal dressing parameters, which are only valid for the particular methods and dressing and grinding conditions, are also used. The paper presents a methodology for optimization of the dressing parameters in cylindrical grinding. The generalized utility function has been chosen as an optimization parameter. It is a complex indicator determining the economic, dynamic and manufacturing characteristics of the grinding process. The developed methodology is implemented for the dressing of aluminium oxide grinding wheels by using experimental diamond roller dressers with different grit sizes made of medium- and high-strength synthetic diamonds type AC32 and AC80. To solve the optimization problem, a model of the generalized utility function is created which reflects the complex impact of dressing parameters. The model is built based on the results from the conducted complex study and modeling of the grinding wheel lifetime, cutting ability, production rate and cutting forces during grinding. They are closely related to the dressing conditions （dressing speed ratio, radial in-feed of the diamond roller dresser and dress-out time）, the diamond roller dresser grit size/grinding wheel grit size ratio, the type of synthetic diamonds and the direction of dressing. Some dressing parameters are determined for which the generalized utility fimction has a maximum and which guarantee an optimum combination of the following： the lifetime and cutting ability of the abrasive wheels, the tangential cutting force magnitude and the production rate of the grinding process. The results obtained prove the possibility of control and optimization of grinding by selecting particular dressing parameters.

Dressed原子与多模弱压缩光场的单光子相互作用

采用dressed原子的方法,处理了dressed原子与多模压缩光场之间的单光子相互作用。计算了各dressed原子本征态之间的跃迁速率,并讨论了在稳定时,弱光场的存在对共振荧光的影响以及dressed原子对弱光场的吸收和辐射。

双光子Dressed原子与多模压缩光场的双光子相互作用

本文采用了dressed原子的方法,处理了双光子dressed原子(以下简称dressed原子)与多模压缩光场之间的双光子相互作用,计算了各dressed原子本征态之间的跃迁速率,并讨论了在稳定时,弱无场的存在对双光子共振荧光的影响以及dressed原子对弱光场的吸收和辐射。

Accumulation of REEs in Field Wheat and Comparison between Two Kinds of REEs Dressing Methods

Four groups of field experiments including REEs foliage dressing, soil dressing, triple amounts of soil dressing and control were carried out. Contents of REEs in wheat in different growing stages were measured by ICP-MS. The results show that REEs amount in leaves increases significantly with foliage dressing in jointing stage, in addition to REEs accumulation with soil dressing method in jointing stage. Either using foliage dressing or soil dressing, there is no significant accumulation in mature stage. Comparison of the two methods shows that lower amount of REEs with foliage dressing can be highly absorbed in jointing stage.

多光子Jaynes-Cummings模型的Dressed变换

本文应用正则Dressed变换技术,研究了多光子Jaynes—Cummings模型的本征能谱和本征函数,在此基础上,给出了这一模型的一般演化规律。

二能级原子Dressed态的非经典特性

通过精确求解二能级原子与场相互作用时的哈密顿量的本征值,得到了自发辐射下的二能级原子的Dressed态.加入基态后,用完备集来描述原子和场组成的系统.经过计算后,得到了场方差一般表达式及场的二阶相干度,并求得初始条件下的压缩最佳值.