bluuebunny/crossref_metadata_2025_split huggingface dataset:
Official tenure and governance effectiveness of China's basic pension insurance system: An inverted U-shaped curve
Authors: Li Zhiguang , Si Xu , Zhang Wei , Feng Zhipei , Li Tingjing , Guo Yige 
Published: September 2022

ObjectivesBased on incentive theory of motivation, this paper aims to estimate China's basic pension insurance's annual efficiency and inter-period efficiency changes from 2015 to 2019 and further examine the relationship between official tenure and basic pension insurance governance performance.MethodsThe DEA—BCC model was used to evaluate the operating efficiency of basic pension insurance in 31 provinces of China. And four panel Tobit models were constructed to examine the heterogeneous linkages between officials' tenure and governance efficiency in different regions of China.ResultsThe results showed that there was an inverted U-shaped relationship between the official tenure and the governance efficiency of basic pension insurance. The younger an official was in his current position, the more apparent the inverted U-shaped relationship between the tenure of an official and the governance efficiency of basic pension insurance. We also found that localized government officials showed better governance efficiency of basic pension insurance. However, as the term of office of officials increased, the governance efficiency of non-localized officials showed a steeper negative effect.ConclusionThis study firstly reveals a significant relationship between the characteristics of officials and the operation of China's basic pension insurance system, which is a complement to the study of China's basic pension systems.
Sex-specific association between elective cesarean section and growth trajectories in preschool children: A prospective birth cohort study
Authors: Zhang Shanshan , Zhou Jixing , Yang Mengting , Zhang Fu , Tao Xingyong , Tao Fangbiao , Huang Kun 
Published: September 2022

BackgroundElective cesarean section (ECS) primarily contributes to the rising cesarean section (CS) rate, and much attention has been attracted to its health consequences. The association between ECS and overweight and obesity in children has been controversial, and few studies distinguished ECS with medical indications from those without indications. Based on a large sample birth cohort, we aim to examine the association of ECS with or without medical indications on children's physical development by using repeated anthropometric data from birth to 6 years of age.MethodsA total of 2304 mother-child pairs with complete data on delivery mode and children's anthropometric measurements were recruited from the Ma'anshan-Anhui Birth Cohort (MABC) in China. ECS was the main exposure in this study, and the primary outcomes were children's growth trajectories and early adiposity rebound (AR). Children's BMI trajectories were fitted by using group-based trajectory models and fractional polynomial mixed-effects models. The association between ECS and children's growth trajectories and early AR was performed using multiple logistic regression models.ResultsAmong 2,304 mother-child pairs (1199 boys and 1105 girls), 1088 (47.2%) children were born by CS, including 61 (5.6%) emergency CS, 441 (40.5%) ECS with medical indications, and 586 (53.9%) ECS without medical indications. After adjusting for potential confounders, it was found that ECS with medical indications was associated with a “high level” of BMI trajectory (OR = 1.776; 95% CI: 1.010–3.123), and ECS without medical indications was associated with early AR (OR = 1.517; 95% CI: 1.123–2.050) in girls. In boys, we found that ECS without medical indications was unlikely to experience an accelerated growth trajectory (OR = 0.484; 95%CI: 0.244–0.959).ConclusionsECS may be related to girls' “high level” BMI trajectories and early AR. If causal, the findings will provide an evidence-based reference for early life interventions for childhood obesity.
Factors associated with long-acting and short-acting reversible contraceptives use among 10–24-years-old youths in Lilongwe, Malawi
Authors: Maruwo George Baxton , Ng'ambi Wingston Felix , Muula Adamson Sinjani , Zonda Khumbo , Kachale Fannie 
Published: September 2022

BackgroundEvidence suggests that Malawi continues to register substantial progress on key Family Planning (FP) indicators. However, FP adoption is still low among married youth (15–24 years old), only 38% of married girls use modern contraceptive methods coupled with high-unmet needs (22%) in the same age group.ObjectiveIdentifying factors associated with long-acting (LARC) and short-acting (SARC) reversible contraceptive use among 10–24-years-old youth in Lilongwe, Malawi.MethodologyA retrospective study using secondary data from 64 youth outreach clinic sites in the Lilongwe district. A quantitative approach using secondary data that was analyzed in STATA version 14 was used. A sample of 14,954 youth who accessed FP and Reproductive Health (RH) services during youth outreach clinics were included in the study.ResultsSARC uptake was higher than LARC (p &lt; 0.01). Of the youths who accessed FP methods, LARC uptake was 25% (n = 3,735). Variations were noted in the uptake of LARC, especially on age, education level, client status occupation, and marital status. Factors associated with LARC uptake varied; new clients were almost twice likely to use LARC (AOR = 1.87, CI: 1.59–2.19, P &lt; 0.01) while youth aged 20–24, the single, and student youth were less likely to use LARC. Compared to young women with formal occupations, students were less likely to use LARC (AOR = 0.30, CI: 0.158–0.58, P &lt; 0.01). Related to the number of living children, youths with a living child were likely to use LARC (AOR = 6.40, CI: 3.91–10.48, P &lt; 0.01).ConclusionThis study showed that LARC uptake in youth outreach clinics in Lilongwe is low, though increasing over time. In addition to this, this study shows that SARC uptake is high among youth compared to LARC. Furthermore, LARC uptake varied by age education, client status (new, existing, and unknown client), occupation, number of living children, and marital status, and there were variations in LARC uptake by the clinic. Current outreach services reach youth with LARC services, but gaps exist for underserved youths.
The profile of inflammatory extracellular vesicles in intracerebral hemorrhage patients
Authors: Sawant Harshal , Bihl Trevor , Nguyen Doan , Iwuchukwu Ifeanyi , Bihl Ji 
Published: September 2022

BackgroundIntracerebral hemorrhage (ICH) is one of the leading life-threatening types of strokes with high mortality. A prominent feature of ICH is neuroinflammation involving leukocytes, such as neutrophils and macrophages. Large extracellular vesicles (lEV) and small extracellular vesicles (sEV) released from various cells are used as biomarkers for different diseases. Here, we aimed to determine the concentration/population of lEV and sEV from different leukocytes in ICH patients and analyze the correlation of these lEV/sEV with clinical parameters.MethodslEV and sEV were isolated from the plasma of ICH patients (n = 39) by using the serial centrifuge methods. Nanoparticle tracking analysis (NTA, NS300) was used to determine the type and concentration of different leukocytes-released lEV/sEV. Specific antibodies, CD66b, P2RY12, and CD80 were used for different leukocyte types.ResultsA predictive relationship between both hospital length of stay (R2 = 0.83) and Intensive care units (ICU) length of stay (R2 = 0.88) was found with lEV and sEV and patient data [including low-density lipoprotein (LDL), ICH volume, etc.]. Further predictive multiple linear regression relationship was seen between lEV and sEV concentrations and MRSV3 (Modified Rankin Scale at 90 days) (R2 = 0.46) and MRSV5 (modified Rankin Scale at 180 days) (R2 = 0.51). Additionally, a slight, but statistically significant (p = 0.0151), multiple linear regression relationship was seen between lEV and sEV concentrations and ICU length of stay (R2 = 0.26).ConclusionThis study found predictive relationships between patient outcomes and lEV and sEV. When combined with generally collected patient data (LDL, etc.), measurements of lEV and sEV are strongly predictive of overall patient outcome. Further, larger studies should investigate these effects.
Application of three-dimensional computed tomography bronchography and angiography in thoracoscopic anatomical segmentectomy of the right upper lobe: A cohort study
Authors: Wang Mingbo , Lv Huilai , Wu Tao , Gao Wenda , Tian Yang , Gai Chunyue , Tian Ziqiang 
Published: September 2022

ObjectiveThree-dimensional computed tomography bronchography and angiography (3D-CTBA) can provide detailed imaging information for pulmonary segmentectomy. This study aimed to investigate the safety and effectiveness of 3D-CTBA guidance of anatomical segmentectomy of the right upper lobe (RUL).MethodsThis was a retrospective analysis of anatomical segmentectomy of the RUL at the Thoracic Surgery Department of the Fourth Hospital of Hebei Medical University from December 9, 2013, to June 2, 2021. Preoperatively, all patients underwent contrast-enhanced CT of the chest (to determine the size of the pulmonary nodule) and a lung function test. 3D-CTBA has been performed since 2018; patients with vs. without 3D-CTBA were compared. Segmentectomy was performed according to nodule location.ResultsOf 139 patients (46 males and 93 females, aged 21–81 years), 93 (66.9%) completed single segmentectomy, 3 (2.2%) completed single subsegmentectomy, 29 had combined subsegmentectomy, 7 had segmentectomy combined with subsegmentectomy, and 6 had combined resection of two segments. Eighty-five (61.2%) patients underwent 3D-CTBA. 3D-CTBA cases had decreased intraoperative blood loss (67.4 ± 17.6 vs. 73.1 ± 11.0, P = 0.021) and shorter operation time (143.0 ± 10.8 vs. 133.4 ± 20.9, P = 0.001). 3D-CTBA (Beta = −7.594, 95% CI: −12.877 to −2.311, P = 0.005) and surgical procedure (Beta = 9.352, 95% CI: 3.551–15.153, P = 0.002) were independently associated with intraoperative blood loss. 3D-CTBA (Beta = −13.027, 95% CI: −18.632 to 17.422, P &lt; 0.001) and surgical procedure (Beta = 7.072, 95% CI: 0.864–13.280, P = 0.026) were also independent factors affecting the operation time.ConclusionPreoperative use of 3D-CTBA to evaluate the pulmonary vessels and bronchial branch patterns of the RUL decreased blood loss and procedure time and so would be expected to improve the safety and effectiveness of thoracoscopic segmentectomy.
Hydrogen-Induced Dislocation Nucleation and Plastic Deformation of ⟨001⟩ and ⟨11¯0⟩ Grain Boundaries in Nickel
Authors: Li Jiaqing , Wu Ziyue , Teng Lin , Deng Guanyu , Wang Rui , Lu Cheng , Li Weidong , Huang Xin , Liu Yu 
Published: September 2022

The grain boundary (GB) plays a crucial role in dominating hydrogen-induced plastic deformation and intergranular failure in polycrystal metals. In the present study, molecular dynamics simulations were employed to study the effects of hydrogen segregation on dislocation plasticity of a series of symmetrical tilt grain boundaries (STGBs) with various hydrogen concentrations. Our study shows that hydrogen both enhances and reduces dislocation nucleation events from STGBs, depending on different GB structures. Specifically, for ⟨001⟩ STGBs, hydrogen does not affect the mode of heterogeneous dislocation nucleation (HDN), but facilitates nucleation events as a consequence of hydrogen disordering the GB structure. Conversely, hydrogen retards dislocation nucleation due to the fact that hydrogen segregation disrupts the transformation of boundary structure such as Σ9 (2 2 1¯) ⟨11¯0⟩ STGB. These results are helpful for deepening our understanding of GB-mediated hydrogen embrittlement (HE) mechanisms.
Warfarin versus non-vitamin k antagonist oral anticoagulants: how the degree of coagulation diﬀers during catheter ablation of atrial ﬁbrillation
Authors: Popylkova O. V. , Durmanov S. S. , Patel M. P. , Bazylev V. V. 
Published: September 2022

Aim. To evaluate intraoperative doses of administered heparin to achieve the target value of activated clotting time (ACT) in patients receiving preoperative anticoagulant therapy with warfarin or one of the non-vitamin K antagonists oral anticoagulants (NOAC).Materials and methods. The study was of a retrospective. Inclusion criteria: patients with atrial ﬁbrillation (AF) who have indications for catheter ablation in accordance with national clinical guidelines; age 18-75 years; absence of thrombus and the eﬀect of echocontrasting 3-4 stage in the left atrium cavity according to transesophageal echocardiography or computed tomography with contrast enhancement; regular intake of anticoagulants prescribed at least 3 weeks before hospitalization. Exclusion criteria: additional intake of antiplatelet drugs; contraindications to the anticoagulant therapy, including intolerance to the components of drugs; weight more than 100 kg. According to the criteria for inclusion in the study 279 patients were included (211 of them received warfarin and 68 received one of the NOAC). The mean age of the patients was 59.2±8.9 years, the body mass index was 59.2±8.9 kg/m2. Among them, men accounted for 155 (55,6%), diabetes mellitus was diagnosed in 28 (10%), arterial hypertension - in 224 (80.3%), coronary heart disease - in 103 (36.9%). Paroxysmal AF was observed in 185 (66.3%) of patients, persistent AF - in 77 (27.6%), and long-standing persistent AF - in 17 (6.1%). To ensure maximum comparability of the groups pseudorandomization was performed with the formation of 67 pairs of patients.Results. A group of patients taking warfarin for preoperative preparation required lower doses of heparin to achieve the target AСT and amounted to 14.8±5.1 thousand ME compared to 17.9±4.4 thousand ME in the NOAC group (p=0.0001). Despite the lower dose of heparin the ACT level in the warfarin group was signiﬁcantly higher than in patients taking NOAC (441.5±203.4 sec. and 345.4±148.8 sec. accordingly, p=0.0001).Conclusions. A signiﬁcantly lower dose of heparin was required in the warfarin group to achieve the target ACT (>300) than in the group of NOAC, while the maximum ACT value was higher. Thus, with the standard starting dose of heparin, the target anticoagulation was achieved faster in patients receiving warfarin.
بناء مقياس جودة أداء منتسبي النشاط الرياضي المدرسي في العراق من وجهة نظر المشرفين الاختصاص
Authors: Mohammed Kh. Ibrahim Al-Noaimy  , Abdel Moneim A. Jassim Al-Janabi  
Published: September 2022

تكمن أهمية البحث في بناء مقياس لجودة أداء النشاط الرياضي المدرسي في العراق ن وجهة نظر المشرفين الاختصاص.
تكمن مشكلة البحث الحالي في الاجابة عن التساؤل الآتي:

هل يمكن توفير أداة يمكن من خلالها بناء مقياس جودة أداء النشاط الرياضي المدرسي في العراق.

تهدف الدراسة إلى:

بناء مقياس جودة اداء لمنتسبي النشاط الرياضي المدرسي في العراق من وجهة نظر المشرفين الاختصاص.
وضع مستويات ودرجات معيارية لمنتسبي النشاط الرياضي المدرسي في العراق من وجهة نظر المشرفين الاختصاص.

أستخدم الباحثان المنهج الوصفي بالأسلوب المسحي، وحدد مجتمع البحث بالمشرفين الاختصاص تربية رياضية من اقسام الإشراف الإختصاصي في المديريات العامة للتربية في المحافظات العراقية والبالغ عددهم (143) مشرف اختصاص تربية رياضية، وقسم المجتمع إلى عينة بناء وعينة تطبيق، وقد قام الباحثان ببناء المقياس معتمدين على مراحل بناء المقياس بشكل علمي، ومقسماً المقياس لمحاور وكل محور يتضمن مجموعة من الفقرات المتعلقة بالمحور وتخدم هدف المقاييس، وتم الحصول على البيانات الخام التي قام الباحثان بمعالجتها إحصائياً باستخدام الحقيبة الإحصائية (spss. 24) وفق ما تتطلبه النتائج وتخدم اهداف الدراسة.
وقد توصل الباحثان في دراسته لعدد من النتائج أهمها:

توصل الباحثان إلى بناء مقياس جودة أداء النشاط الرياضي المدرسي في العراق من وجهة نظر المشرفين الاختصاص.
تم وضع مستويات ودرجات معيارية لمقياس جودة أداء النشاط الرياضي المدرسي في العراق من وجهة نظر المشرفين الاختصاص.
" تأثير التدريب بمحاكاة المرتفعات على بعض الصفات البدنية لدى لاعبي كرة القدم "
Authors: BELMAHI SALIM (PhD student)  
Published: September 2022

تهدف هذه الدراسة إلى التعرف على مدى فعالية تأثير التدريب بالمرتفعات على بعض الصفات البدنية لدى لاعبي كرة القدم و لهذا الغرض إستخدم الباحث المنهج التجريبي على عينة متكونة من 21 لاعبا في نفس الفريق شباب الرمشي – صنف الأواسط – مقسمين الى ثلاث أقسام ( 5 لاعبين للعينة الإستطلاعية ، 8 لاعبين للعينة الضابطة و 8 لاعبين للعينة التجريبية ) و كان إختيارها بصفة مقصودة حيث أنهم يتدربون على إرتفاع يعتبر منخفض و لم يسبق لهم و أن قاموا بمعسكرات تدريبية على الإرتفاعات ، و لجمع البيانات إستخدم الباحث بطارية إختبارات بدنية موجهة تحتوي في مضمونها على إختبارات للياقة البدنية ، مما توصل الباحث إلى أهم النتائج حيث أن أن التدريب بمحاكاة المرتفعات يحسن بعض الصفات البدنية و يطورها ، وقد أوصى الباحث على وجوب فرق كرة القدم أن يقوموا ببرمجة بعض المعسكرات التدريبية على المرتفعات خاصة عندما يتعلق الأمر بمنافسة على الارتفاع ،كما أنه يجب إتباع الطرق و الوسائل العلمية الحديثة في إعداد بطاريات الاختبارات .
تأثير تمرينات بجهاز مصمم في المديات الحركية لتأهيل أصابة مفصل الكاحل للاعبي كرة القدم المتقدمين
Authors: Fadhil Daham Mansour  , Ali Adnan Rahim  
Published: September 2022

تكمن أهمية البحث عن طريق سعي الباحثان في التوظيف المناسب لبعض المبادئ الميكانيكية التي يعمل عليها مفصل كاحل وبواسطته تصميم جهاز يعمل على نفس المبدأ ( مبدأ الفائدة الميكانيكية وعزوم القوة) لأحداث بعض التكيفيات للعضلات العاملة على مفصل الكاحل عن طريق اعداد تمرينات تأهيلية خاصة لأربطة وعضلات مفصل كاحل لاعبين كرة القدم المصابين بتمزق اربطة الكاحل ليتمكن الرياضي من العودة الى الملاعب بزمن أقصر وبالمستوى الذي كان عليه قبل حدوث الاصابة او ما يقارب منه. ويرى الباحثان أن المشكلة الاساسية لحدوث الاصابات في كرة القدم تعود الى انعدام القوة التي يسلطها اللاعب عند حركته وتغير الاتجاه وهذا يتطلب زيادة في القوة العضلية.
كما أن هنالك قوه رئيسة تسبب في حدوث أصابه تمزق الكاحل وهي قوة الاحتكاك التي تسبب اصابة تمزق مفصل الكاحل, فضلاً عن تأخر عودة اللاعبين المصابين الى ممارسة اللعبة بشكل فاعل ومؤثر نتيجة ضعف خطوات البرنامج التأهيلي بعد حدوث الإصابة، لاستعادة اللاعبين لقدراتهم وإمكاناتهم السابقة وذلك قد يكون سبباً في عودة حدوث الاصابة مجدداً.
يهدف البحث الى:

تصميم جهاز خاص لتأهيل اصابة مفصل الكاحل للاعبي كرة القدم المتقدمين
إعداد تمرينات تأهيلية لتأهيل أصابة مفصل الكاحل لاعبي كرة القدم المتقدمين
التعرف على تأثير التمرينات التأهيلية بجهاز مصمم لأصابه مفصل الكاحل في المديات الحركية للاعبي كرة القدم المتقدمين

وافترض الباحثان ما يأتي:

توجد فروق دالة احصائياً بين القياسات القبلية والبعدية في المدى الحركي لمفصل الكاحل للاعبي كرة القدم .
توجد فروق دالة إحصائياً بين القياسات القبلية والبعدية ولصالح القياسات البعدية في المديات الحركية للاعبي كرة القدم المصابين بمفصل الكاحل .

وتضمنت مجالات البحث:

المجال البشري: لاعبو اندية الدرجة الأولى لكرة القدم المتقدمين في واسط للموسم (2020-2021) المصابين بتمزق مفصل الكاحل
المجال الزماني: للفترة من (18/11/2020 ولغاية 1/8/2021)
المجال المكاني: قاعة العراقي لبناء الاجسام والقوة البدنية في محافظة واسط /قضاء الكوت / مركز تأهيل الاطراف الصناعية

استعمل الباحثان المنهج التجريبي لملائمته وطبيعة حل مشكلة البحث وتمثل مجتمع البحث بلاعبي اندية الدرجة الأولى لكرة القدم للمتقدمين، واختيرت بالطريقة العمدية، وبعد اجراء الاختبارات القبلية وتطبيق التمرينات على العينة تم اجراء الاختبارات البعدية ومعالجة البيانات الإحصائية باستخدام ( الوسط الحسابي والانحراف المعياري والوسيط وقانو ت للعينات المترابطة) .
وتم التوصل الى العديد من الاستنتاجات أهمها:

إن التمرينات المعدة على الجهاز المصمم كان لها تأثير إيجابي في احداث تحسن في المديات الحركية لمفصل الكاحل والقدم.
إن الـتمرينــات على الجهاز المصمم قللت الفروق بين الرجل المصابة والرجل السليمة بالمقارنة بين قيم الاختبارات القبلية والبعدية في جميع متغيرات الدراسة ولصالح الاختبارات البعدية.

التوصيات:

يقترح الباحثان استخدام فترات اطول في التمرينات التأهيلية كما في الدراسة الحالية لضمان الوصول المستويات الخاصة بالمديات الحركية مقارنة بالقدم المصابة.
امكانية استخدام الجهاز المصمم والتمرينات المعدة عليه على درجات أخرى من الإصابة الأولى والثالثة معرفة نتائجها.
اجراء دراسات مشابهة على فعاليات اخرى وعينات مختلفة .
GAIT ANALYSIS: THE EFFECT OF SUSPENSION TYPE IN TRANSFEMORAL PATIENT
Authors: Rahmawati Linda , Hjelmstrom Olle , Widada Ns. , Mughnie Burlian 
Published: September 2022

Background: common problems that occur in patients with transfemoral is the lack of stability during using the prosthesis and will result in gait deviation. One of the most important components in improving the stability of the patient is the selection of the type of suspension that appropriate to the patient's needs so as to improve gait. Objective: This study aimed to determine the difference Cadance, walking speed and step length transfemoral patients when using different types of suspension Methods: The study was conducted using the method of observation. Sample research is 4 transfemoral patients have an age of 26-60 years and male sex. Patients were asked to use Silesian belt supesnion and silicone liner with lanyard suspension respectively for 7 days. Observations using tape record. Differences Cadance, walking speed and stride length calculated at the time when patient walks in the 10-meter walking test. Research carried out in clinical laboratories prosthetics and orthotics department. Results: Results indicate that there are significant differences in the type of suspension against Cadance, walking speed and stride length even though significant only on the difference Cadance. Another factor studied in this research is the influence of age and the length of the patient's stump in Cadance, walking speed and stride length. Conclusion: This research found that the Cadance, walking speed and stride length of the transfemoral patients have diffences when using two different types of suspension.
APPLICATION OF THE THEORY OF LATENT VARIABLES FOR THE ANALYSIS OF THE ELEMENTAL BASIS OF SIGNAL PROCESSING DEVICES BASED ON THE PAIRED-COMPARISON METHOD
Authors: Ананьев А.В. , Иванников К.С. , Моисеев С.И. 
Published: September 2022

В работе проанализированы проблемы экспертного оценивания технических систем методами парных сравнений. Предложен математический аппарат обработки экспертных данных, основанный на модели Раша оценки латентных переменных. Приведена апробация предлагаемых решений для анализа элементного базиса устройств обработки сигналов.
The paper analyzes the problems of expert evaluation of technical systems by paired-comparison method. A mathematical apparatus for processing expert data based on the Rasch model for estimating latent variables is proposed. Approbation of the proposed solutions for the analysis of the elemental basis of signal processing devices is given.
THE OPTIMAL DISTRIBUTION ALGORITHM FOR RESOURCE SUPPORT AT THE STAGE OF DEVELOPMENT AND OPERATION OF THE DIGITAL MANAGEMENT ENVIRONMENT
Authors: Львович Я.Е. , Рындин Н.А. 
Published: September 2022

В статье рассматриваются вопросы построения цифровой среды управления в организационных системах, в частности функционирование и развитие цифровой среды на протяжении всего жизненного цикла существования организационной системы.
The article deals with the issues of building a digital management environment in organizational systems, in particular, the functioning and development of the digital environment throughout the entire life cycle of the existence of an organizational system.
ALGORITHM FOR GROUPING TEXT DATA WITH RECOMBINATION ACCORDING TO THE PRINCIPLE OF CHEMICAL REACTION
Authors: Минъюй Гао , Цепкова М.И. , Резова Н.Л. , Чжаньцзюнь Ма , Ступина А.А. 
Published: September 2022

Предложен алгоритм автоматического группирования текстовых данных, использующий алгоритм k-средних в комбинации с процедурой кроссовера, вдохновленной молекулярными химическими реакциями. Вычислительный эксперимент демонстрирует сравнительную эффективность алгоритма по точности и F-мере.
We propose an algorithm for clustering text data using the k-means algorithm combined with a crossover procedure inspired by molecular chemical reactions. The computational experiment demonstrates the comparative efficiency of the proposed algorithm, taking into account accuracy and F-measure.